WO2023162921A1

WO2023162921A1 - Power supply device, power supply device control method, program, and storage medium

Info

Publication number: WO2023162921A1
Application number: PCT/JP2023/005947
Authority: WO
Inventors: 椎山拓己; 島達也
Original assignee: 本田技研工業株式会社
Priority date: 2022-02-25
Filing date: 2023-02-20
Publication date: 2023-08-31
Also published as: JPWO2023162921A1

Abstract

In a power supply device (10) and a method for controlling the power supply device (10), a first power conversion unit (60) is controlled on the basis of a first decrease characteristic such that a first output voltage decreases as a first output current increases. Also, a second power conversion unit (82) is controlled on the basis of a second decrease characteristic such that a second output voltage decreases as a second output current increases. The first decrease characteristic and the second diminishing characteristic are set so as to be different from each other.

Description

Power supply, power supply control method, program and storage medium

The present invention relates to a power supply, a power supply control method, a program, and a storage medium.

International Publication No. 2020/235617 discloses an electric power output device including a power storage unit. The power output device converts DC power output from the power storage unit into AC power. The power output device outputs the converted AC power to the outside.

When power is supplied to the load from two power output devices, the two power output devices are connected in parallel to the load. If the amount of power stored in each power storage unit drops to a threshold value when each of the two power output devices is operated at rated power, each power storage unit needs to be replaced. In this case, power cannot be supplied from each power output device to the load during replacement of each power storage unit.

An object of the present invention is to solve the above-described problems.

A first aspect of the present invention is a power supply device that outputs electric power to the outside, wherein the power supply device is connected to a first power storage unit, a second power storage unit, the first power storage unit, and a load. a first power transmission path connecting a load connection section; a second power transmission path connecting the second power storage section and the load connection section; a first power conversion unit that converts power supplied from the second power transmission path, a second power conversion unit that converts power supplied from the second power storage unit, and the first power conversion unit and a second control unit that controls the second power conversion unit, wherein the first power storage unit and the second power storage unit are connected in parallel to the load connection unit. , and the first control unit is configured such that as the first output current output from the first power conversion unit increases, the first output voltage output from the first power conversion unit gradually decreases. Based on the step-down characteristic, the first power conversion unit is controlled, and as the second output current output from the second power conversion unit increases, the second control unit outputs from the second power conversion unit The second power conversion unit is controlled based on a second step-down characteristic such that the output voltage is stepped down, and the first step-down characteristic and the second step-down characteristic are set to be different from each other. .

A second aspect of the present invention is a second power storage unit connected in parallel to the first power storage unit with respect to the load when the first power storage unit and the load are connected via a first power transmission path. A power supply device including a power storage unit, the power supply device being arranged in a second power transmission path connecting the second power storage unit and the load, a power conversion unit that converts supplied power; and a control unit that controls the power conversion unit. When the first power storage unit outputs electric power based on a third decreasing characteristic such that the first output current output from the path gradually decreases, the control unit controls the second output output from the power conversion unit. The power conversion unit is controlled based on a fourth gradual decrease characteristic such that the second output current output from the power conversion unit gradually decreases as the voltage increases, and the fourth gradual decrease characteristic is the third gradual decrease characteristic. is set differently from

A third aspect of the present invention is a control method for a power supply device that outputs electric power to the outside, wherein the power supply device includes a first power storage unit, a second power storage unit, the first power storage unit, and a load. a first power transmission path that connects a connected load connection section; a second power transmission path that connects the second power storage section and the load connection section; a first power conversion unit that converts power supplied from one power storage unit; a second power conversion unit that is arranged in the second power transmission path and converts power supplied from the second power storage unit; a control unit that controls the first power conversion unit and the second power conversion unit, the first power storage unit and the second power storage unit being connected in parallel to the load connection unit; is output from the first power conversion unit as the first output current output from the first power conversion unit increases by controlling the first power conversion unit based on the first gradual decrease characteristic a step of stepping down a first output voltage; and a second output output from the second power conversion unit by controlling the second power conversion unit based on a second stepping-down characteristic different from the first stepping-down characteristic. and stepping down a second output voltage output from the second power converter as the current increases.

A fourth aspect of the present invention is a program that causes a computer to execute the power supply control method of the third aspect.

A fifth aspect of the present invention is a storage medium that stores the program of the fourth aspect.

According to the present invention, since the replacement timings of the two power storage units do not overlap, it is possible to continue supplying power to the load.

FIG. 1 is a configuration diagram of a power supply device according to this embodiment. FIG. 2 is a circuit configuration diagram of the power device. FIG. 3 is a flow chart of the first embodiment. FIG. 4 is a diagram showing voltage-current characteristics of the base. FIG. 5 is a timing chart of SOC in the first embodiment. FIG. 6 is a diagram showing first voltage-current characteristics and second voltage-current characteristics. FIG. 7 is a flow chart of the second embodiment. FIG. 8 is a timing chart of SOC in the second embodiment.

FIG. 1 is a configuration diagram of a power supply device 10 according to this embodiment. The power supply device 10 includes a first power device 12 (power source device), a second power device 14 (power source device), a first power transmission path 16 , and a second power transmission path 18 .

The first power device 12 and the second power device 14 are feeders capable of outputting power to the outside. The first power device 12 and the second power device 14 have the same external shape. The first power device 12 has a substantially rectangular parallelepiped first housing 22 . The second power device 14 has a substantially rectangular parallelepiped second housing 24 .

Each of the first power device 12 and the second power device 14 can transmit and receive signals or information to and from the mobile terminal 26 by wireless communication. The mobile terminal 26 is a mobile device that can be operated by the user of the power supply device 10 . The first power device 12 and the second power device 14 can transmit and receive signals or information by wireless communication via the mobile terminal 26 . Alternatively, signals or information may be transmitted and received directly between the first power device 12 and the second power device 14 via radio.

The first power transmission path 16 electrically connects the first power device 12 and a load connection section 28 such as an AC outlet. The first power transmission path 16 is composed of two wires, a first positive line 30 and a first negative line 32 . The second power transmission path 18 electrically connects the second power device 14 and the load connection portion 28 . The second power transmission path 18 is composed of two wires, a second positive line 34 and a second negative line 36 . The first power device 12 and the second power device 14 are connected in parallel to the load connection 28 .

A load 38 is connected to the load connection portion 28 . First power device 12 provides first output power to load 38 via first power transmission path 16 and load connection 28 . Second power device 14 provides second output power to load 38 via second power transmission path 18 and load connection 28 . The first output power and the second output power are AC power.

FIG. 2 is a circuit configuration diagram of the first power device 12 and the second power device 14. FIG. The first power device 12 and the second power device 14 have the same configuration as each other including the circuit configuration. FIG. 2 shows the circuit configuration of one power device.

The first power device 12 includes a first power storage unit 40, a first DC/DC converter 42, a first inverter 44, a first CPU 46 (control unit, storage amount acquisition unit, power consumption amount acquisition unit, calculation unit, first control unit, computer), a first filter 48 , a first voltage sensor 50 , a first current sensor 52 , a first communication section 54 (receiving section), a first outlet 56 and a first parallel terminal 58 . The first DC/DC converter 42 and the first inverter 44 constitute a first power converter 60 . The first power storage unit 40, the first power conversion unit 60, the first CPU (Central Processing Unit) 46, the first filter 48, the first voltage sensor 50, the first current sensor 52, and the first communication unit 54 are 22 (see FIG. 1). A first outlet 56 and a first parallel terminal 58 are provided on the first housing 22 .

The second power device 14 includes a second power storage unit 62, a second DC/DC converter 64, a second inverter 66, a second CPU 68 (a control unit, a storage amount acquisition unit, a power consumption amount acquisition unit, a calculation unit, a voltage acquisition unit, a 2 control unit, computer), a second filter 70 , a second voltage sensor 72 , a second current sensor 74 , a second communication unit 76 (receiving unit), a second outlet 78 and a second parallel terminal 80 . The second DC/DC converter 64 and the second inverter 66 constitute a second power converter 82 . The second power storage unit 62, the second power conversion unit 82, the second CPU 68, the second filter 70, the second voltage sensor 72, the second current sensor 74, and the second communication unit 76 are connected to the second housing 24 (see FIG. 1). ) is housed inside. A second outlet 78 and a second parallel terminal 80 are provided on the second housing 24 .

As described above, the first power device 12 and the second power device 14 have the same configuration including the circuit configuration. Therefore, the configuration of the first power device 12 will be described as a representative. Therefore, detailed description of the second power device 14 is omitted.

The first power storage unit 40 is a DC power supply. The first power storage unit 40 is arranged (accommodated) inside the first housing 22 (see FIG. 1). The first power storage unit 40 is detachable from the first power device 12 . The first power storage unit 40 is a mobile battery detachable from the first power device 12 . The first power storage unit 40 is preferably a detachable lithium-ion battery pack, for example.

At least one first power storage unit 40 should be attached to the first power device 12 . When first power device 12 includes a plurality of first power storage units 40 , at least one first power storage unit 40 among the plurality of first power storage units 40 may be detachable from first power device 12 . . In this case, first power storage unit 40 is preferably detachable from first power device 12 without using a separate work tool or the like. That is, the first power storage unit 40 is configured to be freely attachable to and detachable from the first power device 12 without using a work tool or the like. Further, "attachment to and detaching from the first power device 12" includes a case where the first power storage unit 40 is attached to the first power device 12, and a case where the first power storage unit 40 is removed from the first power device 12. This includes cases where In the following description, a case where one first power storage unit 40 is detachable from the first power device 12 will be described.

The first power storage unit 40 can output DC power based on a control signal from the first CPU 46 . The first power storage unit 40 sequentially notifies the first CPU 46 of SOC (State Of Charge), which is the amount of power stored.

The first power transmission path 16 connects the first power storage unit 40 and the load connection unit 28 . A portion of the first power transmission path 16 within the first power device 12 connects the first power storage unit 40 and the first outlet 56 . A portion of the first power transmission path 16 outside the first power device 12 connects the first outlet 56 and the load connection 28 .

A first DC/DC converter 42 , a first inverter 44 , a first filter 48 are provided in a portion of the first power transmission path 16 within the first power device 12 from the first power storage unit 40 toward the first outlet 56 . , a first voltage sensor 50 and a first current sensor 52 are arranged in order. Of the first positive line 30 and the first negative line 32 of the first power transmission path 16, the portion between the first voltage sensor 50 and the first current sensor 52 and the first outlet 56 is connected by two wires 84. It is connected to the first parallel terminal 58 via.

The first DC/DC converter 42 converts the DC voltage of the first power storage unit 40 into a desired value of DC voltage based on the control signal from the first CPU 46 . The first inverter 44 converts the DC voltage converted by the first DC/DC converter 42 into a first output voltage based on the control signal from the first CPU 46 . Therefore, the first power converter 60 converts the DC voltage of the first power storage unit 40 into the first output voltage. The first output voltage is an alternating voltage. The first filter 48 removes noise superimposed on the first output voltage converted by the first inverter 44 .

The first voltage sensor 50 is arranged in the portion of the first power transmission path 16 between the first filter 48 and the connection point between the first power transmission path 16 and the two wires 84 . One end of the first voltage sensor 50 is connected to the first positive line 30 . The other end of the first voltage sensor 50 is connected to the first negative line 32 . The first voltage sensor 50 sequentially detects the first output voltage that has passed through the first filter 48 and outputs the detection results to the first CPU 46 .

The first current sensor 52 is connected to one end of the first voltage sensor 50 in the first positive line 30 of the first power transmission path 16 and connected to the first positive line 30 and one wiring 84 . It is located in the part between The first current sensor 52 successively detects the first output current flowing from the first inverter 44 to the load connecting portion 28 and outputs the detection result to the first CPU 46 . The first output current is alternating current.

The first CPU 46 is a computer that comprehensively controls each part of the first power device 12 . The first CPU 46 implements various functions by reading and executing programs stored in the memory 86 (storage medium). Functions of the first CPU 46 will be described later.

The first communication unit 54 transmits and receives signals or information to and from the mobile terminal 26 by wireless communication. The first communication unit 54 also transmits and receives signals or information by wireless communication with the second power device 14 via the mobile terminal 26 . Alternatively, the first communication unit 54 can directly transmit and receive signals or information to and from the second power device 14 by wireless communication.

In the above description of the circuit configuration, by replacing the wording "first" with "second" and the wording "second" with "first", the circuit configuration of the second power device 14 is an explanation.

The operation of the power supply device 10 configured as above will be described with reference to FIGS. 3 to 8. FIG. This operation will be described with reference to FIGS. 1 and 2 as necessary.

Here, parallel operation in which power is output from both the first power device 12 and the second power device 14 to the load 38 will be described. Also, an operation when replacing the first power storage unit 40 and the second power storage unit 62 attached to the first power device 12 and the second power device 14 during parallel operation will be described. Specifically, a first embodiment shown in FIGS. 3 to 6 and a second embodiment shown in FIGS. 7 and 8 will be described. In any embodiment, the power supply device 10 operates so as to stagger the replacement timing of the first power storage unit 40 and the second power storage unit 62 during parallel operation. Also, in any of the embodiments, the case where the first CPU 46 is the operating body of the power supply device 10 will be described.

First, the first embodiment will be described with reference to FIGS. 3 to 6. FIG. In the first embodiment, the case where the SOC of first power storage unit 40 is lower than the SOC of second power storage unit 62 will be described.

In step S1 of FIG. 3, the user of the power supply device 10 (see FIG. 1) operates the mobile terminal 26 to instruct execution of parallel operation. The user operates the portable terminal 26 so as to execute the operation mode (specification aspect) of the first embodiment. The mobile terminal 26 transmits an instruction signal for instructing execution of the operation mode of the first embodiment to the first power device 12 and the second power device 14 based on the user's operation content (request). The first communication unit 54 (see FIG. 2) of the first power device 12 receives the instruction signal and outputs it to the first CPU 46 . The second communication unit 76 of the second power device 14 receives the instruction signal and outputs it to the second CPU 68 . The request from the user also includes the share of the output power supplied from the first power storage unit 40 and the second power storage unit 62 to the load 38 (sharing rate).

In step S2, the first CPU 46 executes the operation mode based on the instruction signal. A map 88 is stored in the memory 86 of the first CPU 46 . This map 88, as shown in FIG. 4, has voltage-current characteristics (first decreasing characteristic (third decreasing characteristic), 1 drooping characteristics).

In this map 88, the vertical axis is the effective value of the output voltage, and the horizontal axis is the effective value of the output current. In the following description, for convenience, "effective value of output voltage" may be referred to as "output voltage", and "effective value of output current" may be referred to as "output current".

This map 88 has a gradual decrease characteristic (first gradual decrease characteristic) such that the output voltage gradually decreases as the output current increases. Further, this map 88 has a drooping characteristic (first drooping characteristic) such that the output voltage sharply decreases when the output current is equal to or greater than the threshold value Ith0 (third predetermined value). The droop feature is provided to protect the power supply 10 (power unit) from overcurrent.

Based on this map 88, the first CPU 46 controls the first power converter 60 so that the first output voltage and the first output current of desired values are output. Specifically, the first CPU 46 sets target values for the first output voltage and the first output current based on the map 88 . The first CPU 46 outputs a control signal corresponding to the target value to the first power converter 60 .

Note that the memory 86 may store a map 88 having a plurality of voltage-current characteristics with different descent characteristics and drooping characteristics. In this case, the first CPU 46 selects an appropriate voltage-current characteristic from among the plurality of voltage-current characteristics, refers to the selected voltage-current characteristic, and sets the target values of the first output voltage and the first output current. good.

The first DC/DC converter 42 converts the DC voltage of the first power storage unit 40 into a desired value of DC voltage based on the control signal. The first inverter 44 converts the DC voltage converted by the first DC/DC converter 42 into a first output voltage based on the control signal. As a result, supply of first output power (first output voltage, first output current) from the first power device 12 to the load 38 is started. When the first output power is active power, the first output power is the product of the effective value of the first output voltage, the effective value of the first output current, and the power factor.

The first voltage sensor 50 detects the first output voltage and outputs the detection result to the first CPU 46 . The first current sensor 52 detects the first output current and outputs the detection result to the first CPU 46 . Therefore, the first CPU 46 can perform feedback control so that the first output voltage and the first output current become the target values.

The first CPU 46 notifies the second power device 14 via the first communication unit 54 that the first power device 12 has started executing the operation mode. The second communication unit 76 of the second power device 14 receives the content of the notification from the first CPU 46 and outputs it to the second CPU 68 .

The second CPU 68 executes the operation mode based on the contents of the notification from the first CPU 46. A map 88 is also stored in the memory 86 of the second CPU 68 . This map 88 is similar to the map 88 stored in the memory 86 of the first CPU 46 (see FIG. 4).

As described above, the first power device 12 and the second power device 14 are connected in parallel to the load connection section 28 . First power device 12 provides a first output voltage to load 38 . Therefore, the second outlet 78 of the second power device 14 is also supplied with the first output voltage. The second voltage sensor 72 detects the first output voltage and outputs the detection result to the second CPU 68 . Alternatively, the first CPU 46 may notify the second CPU 68 of the detection result of the first voltage sensor 50 via the first communication unit 54 .

The second CPU 68 sets target values for the second output voltage and the second output current based on the map 88 . In this case, the second CPU 68 sets the target value such that the first output voltage and the second output voltage are equal. The second CPU 68 outputs a control signal corresponding to the target value to the second power converter 82 .

The second DC/DC converter 64 converts the DC voltage of the second power storage unit 62 into a desired value of DC voltage based on the control signal. The second inverter 66 converts the DC voltage converted by the second DC/DC converter 64 into a second output voltage based on the control signal. Thereby, supply of the second output power (second output voltage, second output current) from the second power device 14 to the load 38 is started. When the second output power is active power, the second output power is the product of the effective value of the second output voltage, the effective value of the second output current, and the power factor.

The second voltage sensor 72 detects the second output voltage and outputs the detection result to the second CPU 68. The second current sensor 74 detects the second output current and outputs the detection result to the second CPU 68 . Therefore, the second CPU 68 can perform feedback control so that the second output voltage and the second output current become the target values.

In this way, parallel operation is started in which the load 38 is supplied with the first output power from the first power device 12 and the second output power is supplied from the second power device 14 to the load 38 . At the beginning of parallel operation, the first power conversion section 60 and the second power conversion section 82 are controlled based on the same first voltage-current characteristics. Therefore, the amounts of power (shared power) shared by the first power device 12 and the second power device 14 with respect to the load 38 are equal.

Also, in parallel operation, the first power converter 60 and the second power converter 82 are controlled so that the first output voltage and the second output voltage are equal. That is, in the parallel operation, synchronization processing is performed to match the first output voltage and the second output voltage. In parallel operation, the second power device 14 may synchronize the first output voltage and the second output voltage in the following manner.

The second CPU 68 controls the second power converter so that the first state quantity correlated with the frequency of the second output voltage and the second state quantity correlated with the phase of the second output voltage match the first output voltage. control 82; Also, the second CPU 68 controls the second power converter 82 such that the third state quantity correlated with the amplitude of the second output voltage matches the first output voltage.

The first state quantity is a physical quantity related to the frequencies of the first output voltage and the second output voltage. Specifically, the first state quantity is the frequency, period, or wavelength of the first output voltage and the second output voltage. The second state quantity is a physical quantity related to the phases of the first output voltage and the second output voltage. A phase of the first output voltage and the second output voltage may be the second state quantity. The third state quantity is a physical quantity relating to the amplitudes of the first output voltage and the second output voltage. Specifically, the third state quantity refers to the magnitude of the voltage at a predetermined phase of the first output voltage and the second output voltage. Amplitudes of the first output voltage and the second output voltage may be the third state quantity.

In step S<b>3 , the first CPU 46 acquires the current state of charge (SOC) from the first power storage unit 40 . The second CPU 68 acquires the current state of charge (SOC) from the second power storage unit 62 . Second CPU 68 notifies first CPU 46 of the SOC of second power storage unit 62 via second communication unit 76 . Thereby, the first CPU 46 can obtain the SOCs of the first power storage unit 40 and the second power storage unit 62 .

In step S4, the first CPU 46 identifies the power storage unit with the lower SOC among the first power storage unit 40 and the second power storage unit 62. Specifically, first CPU 46 specifies that the SOC of first power storage unit 40 is less than the SOC of second power storage unit 62 . Next, the first CPU 46 determines to promote the supply of the first output power from the first power storage unit 40 to the load 38 . That is, it is determined to shift the replacement timings of first power storage unit 40 and second power storage unit 62 and replace first power storage unit 40 first.

FIG. 5 is a timing chart showing temporal changes in the SOCs of the first power storage unit 40 (see FIG. 2) and the second power storage unit 62. FIG. In FIG. 5 , the change over time of the SOC of first power storage unit 40 is indicated by a solid line, and the change over time of the SOC of second power storage unit 62 is indicated by a dashed line. Time t1 is the time immediately after the start of parallel operation.

Since the SOC of the first power storage unit 40 is lower than the SOC of the second power storage unit 62 , the first CPU 46 changes the voltage-current characteristics used to control the first power conversion unit 60 . Specifically, as shown in FIG. 6, the first CPU 46 (see FIG. 2) sets the voltage-current characteristics used for controlling the first power conversion unit 60 to the first voltage-current characteristics (first decreasing characteristics, The first drooping characteristic) is changed to the second voltage-current characteristic (second gradual decrease characteristic (fourth gradual decrease characteristic), second drooping characteristic) indicated by the dashed line.

The first voltage-current characteristic is the same characteristic as the voltage-current characteristic shown in FIG. Similar to the first voltage-current characteristic, the second voltage-current characteristic includes a gradual decrease characteristic (second gradual decrease characteristic) in which the output voltage gradually decreases as the output current increases, and ), it has a drooping characteristic (second drooping characteristic) such that the output voltage sharply decreases. The second droop characteristic is provided to protect power supply 10 (see FIG. 1) from overcurrent.

As shown in FIG. 6, the first gradual decrease characteristic (third gradual decrease characteristic) and the second gradual decrease characteristic (fourth gradual decrease characteristic) are set to be different from each other. Specifically, in the second gradual decrease characteristic, the degree of gradual decrease in the output voltage with respect to the increase in the output current is smaller than that in the first gradual decrease characteristic. Therefore, the output current of the first decreasing characteristic becomes I0 and the output current of the second decreasing characteristic becomes Ia (I0<Ia) with respect to the output voltage having the value of V0. That is, when the output current reaches Ia, the load on the power device increases. Therefore, when the output voltage and output current are controlled using the second step-down characteristic, the load on the power device increases and the SOC of the power storage unit quickly decreases. In this way, using the second gradual decrease characteristic increases the load on the electric power device, so the threshold Itha for the second drooping characteristic is set lower than the threshold Ith0 for the first drooping characteristic (Itha<Ith0).

It should be noted that the first voltage-current characteristic and the second voltage-current characteristic may be changed as follows. A plurality of voltage-current characteristics are stored in advance in the map 88 (see FIG. 2). The first CPU 46 selects an arbitrary voltage-current characteristic from among the plurality of voltage-current characteristics as the first voltage-current characteristic or the second voltage-current characteristic, thereby changing the voltage-current characteristic used for controlling the first power conversion unit 60. do. Alternatively, the map 88 stores only the first voltage-current characteristics. In this case, the first voltage-current characteristic is a base voltage-current characteristic. The first CPU 46 generates a second voltage-current characteristic by appropriately adjusting the voltage-current characteristic of the base. Thereby, the first CPU 46 changes the voltage-current characteristic used for controlling the first power conversion unit 60 from the first voltage-current characteristic to the second voltage-current characteristic.

The first CPU 46 sets the target values of the first output voltage and the first output current based on the changed second voltage-current characteristics. The first CPU 46 outputs a control signal corresponding to the set target value to the first power converter 60 . The first power converter 60 outputs a first output voltage and a first output current based on the control signal. As a result, the first output current increases as the first output voltage decreases. As a result, as shown in FIG. 5, the SOC of first power storage unit 40 (see FIG. 2) rapidly decreases with time after time t1.

Further, since the SOC of second power storage unit 62 is greater than the SOC of first power storage unit 40, first CPU 46 maintains the voltage-current characteristics used for controlling second power conversion unit 82 at the first voltage-current characteristics. to decide. The first CPU 46 notifies the content of the determination to the second CPU 68 via the first communication unit 54 .

Based on the notification from the first CPU 46, the second CPU 68 continues to control the second power converter 82 based on the first voltage-current characteristics. As a result, the SOC of second power storage unit 62 slowly decreases over time after time t1.

Thus, in the first embodiment, the first power conversion section 60 and the second power conversion section 82 are controlled by voltage-current characteristics different from each other. The shared power of the first power device 12 and the second power device 14 to the load 38 can be changed arbitrarily.

In step S5 of FIG. 3, the first CPU 46 (see FIG. 2) acquires the current SOC from the first power storage unit 40 again. Second CPU 68 acquires the current SOC again from second power storage unit 62 . Second CPU 68 notifies first CPU 46 of the SOC of second power storage unit 62 again via second communication unit 76 . Thereby, the first CPU 46 can acquire the SOCs of the first power storage unit 40 and the second power storage unit 62 again.

In step S6, the first CPU 46 determines whether the SOC of the first power storage unit 40 has decreased to the threshold SOCth1 (first predetermined value, second predetermined value) shown in FIG.

When the SOC of the first power storage unit 40 has not decreased to the threshold SOCth1 (step S6: NO), the first CPU 46 repeats the process of step S5.

At time t2 in FIG. 5, when the SOC of first power storage unit 40 (see FIG. 2) has decreased to threshold SOCth1 (step S6 in FIG. 3: YES), first CPU 46 proceeds to step S7.

In step S7, first CPU 46 determines that first power storage unit 40 needs to be replaced because the SOC of first power storage unit 40 has decreased to threshold SOCth1 (see FIG. 5). Next, first CPU 46 transmits a message prompting replacement of first power storage unit 40 to portable terminal 26 via first communication unit 54 . The mobile terminal 26 notifies the received message to the outside. The user can recognize that it is time to replace the first power storage unit 40 by checking the content of the notification from the mobile terminal 26 .

In step S8, the first CPU 46 determines whether the user has replaced the first power storage unit 40 or not. For example, when the SOC of first power storage unit 40 becomes greater than threshold SOCth1 due to replacement of first power storage unit 40, first CPU 46 determines that first power storage unit 40 has been replaced (step S8: YES). ).

In the next step S9, the first CPU 46 determines whether or not to stop parallel operation. In this case, the first CPU 46 determines whether or not to stop the parallel operation by confirming whether or not a command to stop the operation mode has been sent from the portable terminal 26 .

If the portable terminal 26 has not sent an operation mode stop command (step S9: NO), the first CPU 46 decides to continue the parallel operation. Next, the first CPU 46 returns to step S3 and repeats the processing of steps S3 to S9.

When the SOC of second power storage unit 62 (see FIG. 2) has decreased to threshold SOCth1 at time t3 in FIG. is transmitted to the mobile terminal 26 via the first communication unit 54 (step S7). The mobile terminal 26 notifies the received message to the outside, so that the user can recognize that the timing for replacing the second power storage unit 62 has come. Next, the user replaces second power storage unit 62 according to the message. When the SOC of second power storage unit 62 becomes greater than threshold SOCth1, first CPU 46 can determine that second power storage unit 62 has been replaced (step S8: YES).

In step S9, when the user operates the mobile terminal 26 to give an instruction (request) to stop the operation mode, the mobile terminal 26 sends an instruction signal corresponding to the stop instruction to the first power device 12 and the second power device. 14. The first communication unit 54 outputs the received instruction signal to the first CPU 46 . The second communication unit 76 outputs the received instruction signal to the second CPU 68 . When the first CPU 46 confirms that the stop command has been notified based on the instruction signal (step S9: YES), the process proceeds to step S10.

In step S<b>10 , the first CPU 46 stops controlling the first power conversion unit 60 . This stops the supply of the first output power from the first power device 12 to the load 38 . Also, the first CPU 46 notifies the second CPU 68 via the first communication unit 54 that the supply of the first output power has stopped. The second CPU 68 receives the notification from the first CPU 46 and stops controlling the second power converter 82 . This stops the supply of the second output power from the second power device 14 to the load 38 . As a result, the parallel operation in the power supply device 10 is stopped. The second CPU 68 may stop supplying the second output power to the load 38 based on the instruction signal from the mobile terminal 26 .

In the first embodiment, as shown in FIG. 5, the time point at which the SOC of first power storage unit 40 (see FIG. 2) drops to threshold SOCth1 is set to an arbitrary time point within time T1 from time t2 to time t3. can be adjusted to

Further, in the first embodiment, when the parallel operation is to be continued (step S9: NO) after replacing the first power storage unit 40 (step S8: YES in FIG. 3), the first CPU 46 operates as follows. good too. Due to the replacement of first power storage unit 40 , the SOC of first power storage unit 40 may become higher than the SOC of second power storage unit 62 . Therefore, in step S4, the first CPU 46 returns the voltage-current characteristic for controlling the first power conversion section 60 from the second voltage-current characteristic to the first voltage-current characteristic. Thereby, the first CPU 46 can control the first power converter 60 based on the first voltage-current characteristic.

Also, the first CPU 46 determines to change the voltage-current characteristic for controlling the second power converter 82 from the first voltage-current characteristic to the second voltage-current characteristic. The first CPU 46 notifies the second CPU 68 of this decision via the first communication unit 54 . The second CPU 68 changes from the first voltage-current characteristic to the second voltage-current characteristic based on the notified content of the decision. The second CPU 68 controls the second power converter 82 based on the changed second voltage-current characteristics. As a result, the SOC of second power storage unit 62 can be quickly reduced.

In addition, in the description of the first embodiment, the case where the SOC of first power storage unit 40 is lower than the SOC of second power storage unit 62 has been described. Even when the SOC of second power storage unit 62 is lower than the SOC of first power storage unit 40, first CPU 46 can perform the same operation. That is, when the SOC of second power storage unit 62 is lower than the SOC of first power storage unit 40, the voltage-current characteristic for controlling second power conversion unit 82 is changed from the first voltage-current characteristic to the second voltage-current characteristic. Change to characteristics. As a result, the second output current becomes larger than the first output current, and the supply of the second output power from second power storage unit 62 to load 38 is facilitated.

Next, a second embodiment will be described with reference to FIGS. 7 and 8. FIG. In the second embodiment, the case where the SOC of first power storage unit 40 (see FIG. 2) is higher than the SOC of second power storage unit 62 will be described.

In step S11 of FIG. 7, the user of the power supply device 10 (see FIG. 1) operates the mobile terminal 26 to instruct execution of parallel operation, as in step S1 of FIG. The user operates the portable terminal 26 so as to execute the operation mode (specification aspect) of the second embodiment. The portable terminal 26 transmits an instruction signal for instructing execution of the operation mode of the second embodiment to the first power device 12 and the second power device 14 based on the user's operation content (request). The first communication unit 54 (see FIG. 2) of the first power device 12 receives the instruction signal and outputs it to the first CPU 46 . The second communication unit 76 of the second power device 14 receives the instruction signal and outputs it to the second CPU 68 .

In step S12, the first CPU 46 executes the operation mode based on the instruction signal, as in step S2 of FIG.

In this case, the first CPU 46 sets the target values of the first output voltage and the first output current based on the map 88 (see FIG. 4). The first CPU 46 outputs a control signal corresponding to the target value to the first power converter 60 .

The first power conversion unit 60 converts the DC voltage of the first power storage unit 40 into the first output voltage based on the control signal. Thereby, supply of the first output power from the first power device 12 to the load 38 is started. The first voltage sensor 50 detects the first output voltage and outputs the detection result to the first CPU 46 . The first current sensor 52 detects the first output current and outputs the detection result to the first CPU 46 . Therefore, the first CPU 46 can perform feedback control so that the first output voltage and the first output current become the target values.

Also, the first CPU 46 notifies the second power device 14 via the first communication unit 54 that the first power device 12 has started executing the operation mode. The second CPU 68 executes the operation mode based on the content of notification from the first CPU 46 .

Specifically, the second CPU 68 sets target values for the second output voltage and the second output current based on the map 88 . In this case, the second CPU 68 sets the target value such that the first output voltage and the second output voltage are equal. The second CPU 68 outputs a control signal corresponding to the target value to the second power converter 82 . The second power converter 82 converts the DC voltage of the second power storage unit 62 into a second output voltage based on the control signal. Thereby, supply of the second output power from the second power device 14 to the load 38 is started. The second voltage sensor 72 detects the second output voltage and outputs the detection result to the second CPU 68 . The second current sensor 74 detects the second output current and outputs the detection result to the second CPU 68 . Therefore, the second CPU 68 can perform feedback control so that the second output voltage and the second output current become the target values.

In this way, parallel operation is started in which the load 38 is supplied with the first output power from the first power device 12 and the second output power is supplied from the second power device 14 to the load 38 . Also in the second embodiment, in the parallel operation, synchronization processing may be performed to match the first output voltage and the second output voltage.

In step S13, the first CPU 46 acquires the current SOC of the first power storage unit 40 and the current SOC of the second power storage unit 62, as in step S3 of FIG.

In step S14, the first CPU 46 identifies the power storage unit with the higher SOC among the first power storage unit 40 and the second power storage unit 62. Specifically, first CPU 46 identifies that the SOC of first power storage unit 40 is higher than the SOC of second power storage unit 62 . Next, the first CPU 46 determines to promote the supply of the first output power from the first power storage unit 40 to the load 38 .

FIG. 8 is a timing chart showing temporal changes in the SOCs of the first power storage unit 40 (see FIG. 2) and the second power storage unit 62. FIG. In FIG. 8 , the change over time of the SOC of first power storage unit 40 is indicated by a solid line, and the change over time of the SOC of second power storage unit 62 is indicated by a dashed line. Time t11 is a time immediately after the start of parallel operation.

Since the SOC of first power storage unit 40 is greater than the SOC of second power storage unit 62, first CPU 46 converts the voltage-current characteristics used for controlling first power conversion unit 60 from the first voltage-current characteristics of FIG. is changed to the second voltage-current characteristic of The first CPU 46 sets the target values of the first output voltage and the first output current based on the changed second voltage-current characteristics. The first CPU 46 outputs a control signal corresponding to the set target value to the first power converter 60 . The first power converter 60 outputs a first output voltage and a first output current based on the control signal. As a result, the first output current increases as the first output voltage decreases. As a result, the SOC of first power storage unit 40 rapidly decreases with time after time t11 in FIG.

In addition, since the SOC of second power storage unit 62 is lower than the SOC of first power storage unit 40, first CPU 46 maintains the voltage-current characteristics used to control second power conversion unit 82 at the first voltage-current characteristics. to decide. The first CPU 46 notifies the content of the determination to the second CPU 68 via the first communication unit 54 .

Based on the notification from the first CPU 46, the second CPU 68 continues to control the second power converter 82 based on the first voltage-current characteristics. As a result, the SOC of second power storage unit 62 slowly decreases over time after time t11.

Thus, also in the second embodiment, the first power conversion section 60 and the second power conversion section 82 are controlled by voltage-current characteristics different from each other. The shared power of the first power device 12 and the second power device 14 to the load 38 can be changed arbitrarily.

In step S15, the first CPU 46 acquires again the current SOC of the first power storage unit 40 and the current SOC of the second power storage unit 62, as in step S5 of FIG.

In step S16, the first CPU 46 determines whether the SOC of the first power storage unit 40 is lower than the SOC of the second power storage unit 62 (SOClow).

When the SOC of the first power storage unit 40 is not lower than the SOC of the second power storage unit 62 (step S16: NO), the first CPU 46 repeats the process of step S15.

When the SOC of the first power storage unit 40 falls below the SOC (SOClow) of the second power storage unit 62 at time t12 in FIG. 8 (step S16: YES), the first CPU 46 proceeds to step S17.

In step S17, the first CPU 46 determines whether the SOC of the first power storage unit 40 is equal to or less than the threshold SOCth2.

When the SOC of the first power storage unit 40 is not equal to or lower than the threshold SOCth2 (step S17: NO), the first CPU 46 returns to step S14 and repeats the processes of steps S14 to S17.

In this case, in step S14, since the SOC of first power storage unit 40 is lower than the SOC of second power storage unit 62, first CPU 46 supplies the second output power from second power storage unit 62 having a large SOC to load 38. Decide to promote

The first CPU 46 restores the voltage-current characteristics used for controlling the first power conversion unit 60 from the second voltage-current characteristics to the first voltage-current characteristics, and controls the first power conversion unit 60 based on the returned first voltage-current characteristics. Control. As a result, the first output current becomes smaller, and the SOC of first power storage unit 40 gradually decreases over time.

Also, the first CPU 46 determines to change the voltage-current characteristic used for controlling the second power converter 82 from the first voltage-current characteristic to the second voltage-current characteristic. The first CPU 46 notifies the content of the determination to the second CPU 68 via the first communication unit 54 . Based on the notification from the first CPU 46, the second CPU 68 controls the second power converter 82 based on the second voltage-current characteristic. As a result, the second output current increases, and the SOC of second power storage unit 62 rapidly decreases over time.

In this way, by repeating the processing of steps S14 to S17, the voltage-current characteristics used by the first CPU 46 and the second CPU 68 are alternated between the first voltage-current characteristics and the second voltage-current characteristics after time t12 in FIG. switch. Accordingly, after time t12, the SOCs of first power storage unit 40 and second power storage unit 62 decrease by substantially the same value over time.

When the SOCs of the first power storage unit 40 and the second power storage unit 62 have decreased to the threshold SOCth2 at time t13 (step S17: YES), the first CPU 46 proceeds to step S18.

In step S18, the first CPU 46 determines whether the SOC of the first power storage unit 40 has decreased to the threshold SOCth3 (first predetermined value, second predetermined value).

After time t13, the first CPU 46 controls the first power converter 60 based on the second voltage-current characteristics. The second CPU 68 controls the second power converter 82 based on the first voltage-current characteristics. Therefore, the SOC of first power storage unit 40 decreases rapidly over time, and the SOC of second power storage unit 62 decreases gently over time.

When the SOC of the first power storage unit 40 has decreased to the threshold SOCth3 at time t14 (step S18: YES), the first CPU 46 proceeds to step S19.

In step S19, first CPU 46 determines that first power storage unit 40 needs to be replaced because the SOC of first power storage unit 40 has decreased to threshold SOCth3. Next, first CPU 46 transmits a message prompting replacement of first power storage unit 40 to portable terminal 26 via first communication unit 54 . The mobile terminal 26 notifies the received message to the outside. The user can recognize that it is time to replace the first power storage unit 40 by checking the content of the notification from the mobile terminal 26 .

In step S20, the first CPU 46 determines whether the user has replaced the first power storage unit 40 or not. For example, when the SOC of first power storage unit 40 becomes greater than threshold SOCth3 due to replacement of first power storage unit 40, first CPU 46 determines that first power storage unit 40 has been replaced (step S20: YES). ).

In the next step S21, the first CPU 46 determines whether or not to stop the parallel operation, similar to step S9 in FIG.

If the mobile terminal 26 has not sent an operation mode stop command (step S21: NO), the first CPU 46 returns to step S13 and repeats the processing of steps S13 to S21.

When the SOC of second power storage unit 62 has decreased to threshold SOCth3 at time t15 (step S18: YES), first CPU 46 carries a message prompting replacement of second power storage unit 62 via first communication unit 54. It is transmitted to the terminal 26 (step S19). The mobile terminal 26 notifies the received message to the outside, so that the user can recognize that the timing for replacing the second power storage unit 62 has come. Therefore, the user replaces the second power storage unit 62 according to the message. When the SOC of second power storage unit 62 becomes greater than threshold SOCth3, first CPU 46 can determine that second power storage unit 62 has been replaced (step S20: YES).

In step S21, when the user operates the mobile terminal 26 to issue a stop command (request) for the operation mode, the mobile terminal 26 sends an instruction signal corresponding to the stop command to the first power device 12 and the second power device. 14. The first communication unit 54 outputs the received instruction signal to the first CPU 46 . The second communication unit 76 outputs the received instruction signal to the second CPU 68 . When the first CPU 46 confirms that the stop command has been notified based on the instruction signal (step S21: YES), the process proceeds to step S22.

In step S22, the first CPU 46 stops controlling the first power converter 60, as in step S10 of FIG. This stops the supply of the first output power from the first power device 12 to the load 38 . Also, the first CPU 46 notifies the second CPU 68 via the first communication unit 54 that the supply of the first output power has stopped. The second CPU 68 receives the notification from the first CPU 46 and stops controlling the second power converter 82 . This stops the supply of the second output power from the second power device 14 to the load 38 . As a result, the parallel operation in the power supply device 10 is stopped. The second CPU 68 may stop supplying the second output power to the load 38 based on the instruction signal from the mobile terminal 26 .

In the second embodiment, as shown in FIG. 8, the time point at which the SOC of first power storage unit 40 (see FIG. 2) drops to threshold SOCth3 is set to any time point within time T2 from time t14 to time t15. can be adjusted to Further, the point in time when the SOC of second power storage unit 62 drops to threshold SOCth3 can be adjusted to any point in time T3 from point t15 to point t16.

Also, in the description of the second embodiment, the case where the SOC of first power storage unit 40 is higher than the SOC of second power storage unit 62 has been described. Even when the SOC of second power storage unit 62 is higher than the SOC of first power storage unit 40, first CPU 46 can perform the same operation. That is, when the SOC of second power storage unit 62 is greater than the SOC of first power storage unit 40, the voltage-current characteristic for controlling second power conversion unit 82 is changed from the first voltage-current characteristic to the second voltage-current characteristic. Change to characteristics. As a result, the second output current becomes larger than the first output current, and the supply of the second output power from second power storage unit 62 to load 38 is facilitated.

In the first and second embodiments, as described above, it is possible to transmit and receive signals or information by wireless communication between the mobile terminal 26 and the first power device 12 and the second power device 14 . Therefore, the portable terminal 26 may monitor the SOCs of the first power storage unit 40 and the second power storage unit 62 using application software (app).

The mobile terminal 26 may be a device capable of wireless communication with the first power device 12 or the second power device 14 . The mobile terminal 26 may be a smart phone, a tablet, or a server. Also, a command may be transmitted from the mobile terminal 26 to the first power device 12 and the second power device 14 by wireless communication. The wireless communication method may be Bluetooth (registered trademark), WiFi (registered trademark), or Internet line.

In the description of the first and second embodiments, the case where the first CPU 46 is the subject of action has been described. Since the first power device 12 and the second power device 14 have the same configuration, the second CPU 68 may be the main operating body. That is, in the first and second embodiments, the first CPU 46 controls the operations of the first power device 12 and the second power device 14 in an integrated manner, as described above. In the first and second embodiments, the second CPU 68 may centrally control the operations of the first power device 12 and the second power device 14 . Alternatively, the functions of the CPU may be integrated into one of the power devices, and the operations of the first power device 12 and the second power device 14 may be controlled by the CPU with the integrated functions.

In addition, since signals or information can be transmitted and received between the first power device 12 and the second power device 14, the first CPU 46 controls only the operation of the first power device 12, and the second CPU 68 controls the second power device. It is also possible to control only the operation of device 14 .

As described above, in the first and second embodiments, the portable terminal 26 transmits an operation command or a stop command to both the first power device 12 and the second power device 14 . Each of the first power device 12 and the second power device 14 starts operating based on the operation command. Each of the first power device 12 and the second power device 14 stops operating based on the stop command. That is, each of the first power device 12 and the second power device 14 operates according to the request from the mobile terminal 26 .

Therefore, when the voltage-current characteristics are switched, signals or information are transmitted and received between the first power device 12 and the second power device 14 as described above. Also, if the voltage-current characteristics are not switched, communication between the first power device 12 and the second power device 14 is unnecessary.

Also, in the first and second embodiments, the case where the voltage-current characteristics are switched based on the SOCs of the first power storage unit 40 and the second power storage unit 62 after starting parallel operation has been described. If the SOCs of first power storage unit 40 and second power storage unit 62 are known in advance, the voltage-current characteristics of first power device 12 and second power device 14 may be initially set to be different from each other. This eliminates the need for communication between the first power device 12 and the second power device 14 .

In the explanations of the first and second embodiments, the user of the power supply device 10 operates the mobile terminal 26 to give an instruction to the power supply device 10, and various notifications are sent from the power supply device 10 to the mobile terminal 26 (user). I explained what would happen. In the first and second embodiments, the owner or administrator of the power supply device 10 operates the mobile terminal 26 to instruct the power supply device 10, and the power supply device 10 sends the mobile terminal 26 (owner or administrator) Various notifications may be made. Alternatively, the user, owner, or administrator of the first power storage unit 40 or the second power storage unit 62 operates the mobile terminal 26 to instruct the power supply device 10, and from the power supply device 10 to the mobile terminal 26 (user, owner or administrator) may receive various notifications. The owner of power supply device 10 , first power storage unit 40 or second power storage unit 62 may be the right holder of power supply device 10 , first power storage unit 40 or second power storage unit 62 .

In the first and second embodiments, in steps S7 and S19, it is sufficient to notify the mobile terminal 26 (user) that the power storage unit needs to be replaced. Therefore, in the first and second embodiments, the first CPU 46 only needs to acquire the SOC of at least one of the first power storage unit 40 and the second power storage unit 62 (the power storage unit to be replaced).

In the first and second embodiments, the first CPU 46 may acquire the power consumption of the load 38 . For example, a power monitoring device (not shown) continuously monitors the power consumption of the load 38 . The power monitoring device transmits the power consumption monitoring result to the mobile terminal 26 . The first CPU 46 acquires the power consumption of the load 38 from the portable terminal 26 by wireless communication. First CPU 46 calculates the time when each SOC becomes SOCth1 or SOCth3 or less based on the acquired power consumption amount and each SOC of first power storage unit 40 and second power storage unit 62 . Alternatively, first CPU 46 calculates a period from the current time to the time when each SOC becomes SOCth1 or SOCth3 or less based on the acquired power consumption amount and each SOC of first power storage unit 40 and second power storage unit 62. . This makes it possible to notify the portable terminal 26 (user) in advance of the remaining power supply time of the first power storage unit 40 and the second power storage unit 62, the timing of replacement, and the like.

As shown in FIG. 1 , the connection points between the first power transmission path 16 and the second power transmission path 18 are the first housing 22 of the first power device 12 and the second housing of the second power device 14 . 24 is provided outside. In this embodiment, the first power transmission path 16 and the second power transmission path 18 are provided inside the first housing 22 of the first power device 12 or inside the second housing 24 of the second power device 14. connection point may be provided. In other words, a connection point between the first power transmission path 16 and the second power transmission path 18 is provided at an arbitrary point between the first power conversion section 60 and the second power conversion section 82 and the load connection section 28 . All you have to do is

The load 38 may be an AC device that operates with output power (AC power) supplied from the power supply device 10 . Such AC appliances include AC consumer electronics, AC motors, AC/DC inverters, and the like.

The mobile terminal 26 may visually and audibly notify the user of the power supply device 10 of various types of information.

The portable terminal 26 sets the shared power, the sharing ratio, or the supplied power value of the first power storage unit 40 and the second power storage unit 62 with respect to the power consumption of the load 38 in accordance with the operation command. It may be transmitted to the two power device 14 . Alternatively, the portable terminal 26 may set the shared power, the sharing ratio, or the supplied power value of one of the first power storage unit 40 and the second power storage unit 62 to the first power device 12 and the second power device 14 . may be sent to

In the above description, a case where signals or information are transmitted and received by wireless communication between the mobile terminal 26 and the first power device 12 and the second power device 14 has been described. In this embodiment, signals or information may be transmitted and received between the mobile terminal 26 and the first power device 12 and the second power device 14 by wired communication. Further, in the present embodiment, signals or information may be transmitted and received between the first power device 12 and the second power device 14 by wired communication.

Also, in the above description, the case where control is performed so that the first output voltage and the second output voltage are equal in both the first power device 12 and the second power device 14 has been described. In this embodiment, either one of the power devices may operate to match one of the first output voltage and the second output voltage to the other output voltage. Alternatively, the first power device 12 and the second power device 14 may cooperate to control the first output voltage and the second output voltage to be equal.

Furthermore, in the above description, each component of the first power device 12 including the first power storage unit 40 is arranged inside the first housing 22, and the second power device 14 including the second power storage unit 62 A case where each component is arranged in the second housing 24 has been described. In this embodiment, each component of the first power device 12 and the second power device 14 may be arranged inside the same (single) housing. In this case, even the load connection section 28 may be arranged (accommodated) inside the same housing.　

The inventions that can be understood from the above embodiments are described below.

A first aspect of the present invention is a power supply device (10) that outputs electric power to the outside, the power supply device comprising a first power storage unit (40), a second power storage unit (62), and the first power storage unit (40). a first power transmission path (16) connecting a power storage unit and a load connection (28) to which a load (38) is connected; and a second power transmission connecting the second power storage unit and the load connection. a path (18); a first power conversion unit (60) arranged in the first power transmission path and configured to convert power supplied from the first power storage unit; A second power conversion section (82) that converts the power supplied from the second power storage section, a first control section (46) that controls the first power conversion section, and a second power conversion section that controls the second power conversion section. 2 control unit (68), wherein the first power storage unit and the second power storage unit are connected in parallel to the load connection unit, and the first control unit is connected to the first power conversion unit. Controlling the first power conversion unit based on a first step-down characteristic such that the first output voltage output from the first power conversion unit gradually decreases as the first output current output from increases, The second control unit is based on a second decreasing characteristic such that the second output voltage output from the second power conversion unit gradually decreases as the second output current output from the second power conversion unit increases. , and controls the second power conversion unit, and the first gradual decrease characteristic and the second gradual decrease characteristic are set to be different from each other.

The present invention will be explained in more detail. Since the timing of replacement of the two power storage units is shifted, by replacing with a charged power storage unit, the power supply device can theoretically supply output power to the load indefinitely. In addition, unlike an uninterruptible power supply (UPS) with a so-called pass-through function, it is not necessary to connect to a power system. Furthermore, even when two power storage units with arbitrary remaining amounts (charge amounts) are attached, the timing of replacement of each power storage unit can be easily controlled.

In the first aspect of the present invention, the first control section may control the first power conversion section such that the first output voltage and the second output voltage are equal.

This makes it possible to suppress the occurrence of a cross current of the output current between the first power storage unit and the second power storage unit due to the output voltage imbalance. As a result, the output current can reliably flow to the load.

In the first aspect of the present invention, the first control unit changes the first output current to the second output current when the power storage amount of the first power storage unit is less than the power storage amount of the second power storage unit. You may control a said 1st power conversion part so that it may become larger than.

This makes it possible to replace the first power storage unit early.

In the first aspect of the present invention, the first control unit changes the first output current to the second output current when the power storage amount of the first power storage unit is greater than the power storage amount of the second power storage unit. You may control a said 1st power conversion part so that it may become larger than.

Even in this case, it is possible to replace the first power storage unit early. Alternatively, it is also possible to synchronize the replacement timings of both the first power storage unit and the second power storage unit.

In the first aspect of the present invention, the power supply device includes a stored electricity amount acquiring unit (46 , 68) and use of the power supply device, the first power storage unit, or the second power storage unit when the power storage amount acquired by the power storage amount acquiring unit becomes equal to or less than a first predetermined value (SOCth1, SOCth3). and a notification unit for notifying the person, owner, or administrator.

As a result, it is possible to reliably notify the user, owner, or administrator of the timing of replacement of the power storage unit.

In the first aspect of the present invention, the power supply device includes a power consumption acquisition unit (46, 68) that acquires the power consumption of the load, the storage amount acquired by the storage amount acquisition unit, and the consumption Based on the power consumption acquired by the power acquisition unit, the time when the power storage amount becomes equal to or less than the second predetermined value (SOCth1, SOCth3), or the power storage amount becomes equal to or less than the second predetermined value from the current time point. A calculation unit (46, 68) for calculating the period up to the point in time may be further provided.

As a result, it is possible to notify users in advance of the remaining power supply time of the power storage unit and the timing of replacement.

In the first aspect of the present invention, the first control section is configured based on a first drooping characteristic such that the first output voltage sharply decreases when the first output current is equal to or greater than a third predetermined value (Ith0). and the second control unit controls the first power conversion unit, and the second control unit provides a second drooping characteristic such that the second output voltage sharply decreases when the second output current is equal to or greater than a fourth predetermined value (Itha). You may control a said 2nd power conversion part based on.

This allows the power supply to be protected from overcurrent.

In the first aspect of the present invention, the power supply device includes a receiving unit that receives a request from a user regarding usage of power stored in at least one of the first power storage unit and the second power storage unit. (54, 76) may further be provided.

As a result, it is possible to supply output power from the power supply to the load according to the specification mode according to the user's request.

In the first aspect of the present invention, at least one of the first control unit and the second control unit controls, based on the request received by the receiving unit, the first power conversion unit and the At least one of the second power conversion units may be controlled.

As a result, the power converter can be appropriately controlled according to the user's request.

In the first aspect of the present invention, the receiving unit may communicate with the mobile terminal (26) of the user and receive the request input by the user to the mobile terminal.

As a result, the power converter can be controlled more appropriately according to the user's request.

In the first aspect of the present invention, the receiving unit makes the request for shared power shared by at least one of the first power storage unit and the second power storage unit with respect to power consumption of the load. You may accept.

This makes it possible to externally control the proportion of the power consumption of the load shared by each of the first power storage unit and the second power storage unit.

In the first aspect of the present invention, the first power storage unit and the second power storage unit may be detachable from the power supply device.

Thereby, the first power storage unit and the second power storage unit can be easily replaced.

In the first aspect of the present invention, the power supply device includes: a first housing (22) housing the first power storage unit, the first power conversion unit, and the first control unit; the second power storage unit; A second housing (24) that houses the second power converter and the second controller may be further provided.

This allows the first housing and the second housing to function as independent power devices.

In the first aspect of the present invention, the first control section and the second control section may be provided so as to communicate with each other.

Thereby, it is possible to easily transmit and receive signals or information between the portion of the first housing and the portion of the second housing.

A second aspect of the present invention is a second power storage unit connected in parallel to the first power storage unit with respect to the load when the first power storage unit and the load are connected via a first power transmission path. A power supply device (14) including a power storage unit, wherein the power supply device is arranged in a second power transmission path connecting the second power storage unit and the load, and arranged in the second power transmission path to A power conversion unit (82) that converts power supplied from a power storage unit, and a control unit (68) that controls the power conversion unit, wherein the first output voltage output from the first power transmission path is When the first power storage unit outputs power based on a third decreasing characteristic in which the first output current output from the first power transmission path gradually decreases as it rises, the control unit controls the power controlling the power conversion unit based on a fourth decreasing characteristic such that the second output current output from the power conversion unit gradually decreases as the second output voltage output from the conversion unit increases; The gradual decrease characteristic is set to be different from the third gradual decrease characteristic.

The present invention also provides the same effect as the first aspect.

In the second aspect of the present invention, the power supply device further includes a voltage acquisition section (68) that acquires the first output voltage, and the control section controls the power conversion section to control the second The first state quantity correlated with the frequency of the output voltage and the second state quantity correlated with the phase of the second output voltage are controlled to match the first output voltage acquired by the voltage acquisition unit. good too.

In the second aspect of the present invention, the control unit controls the power conversion unit to acquire the third state quantity correlated with the amplitude of the second output voltage from the first state obtained by the voltage obtaining unit. It may be controlled to match the output voltage.

As a result, it is possible to further suppress the occurrence of a cross current of the output current between the first power storage unit and the second power storage unit due to the output voltage imbalance. As a result, the output current can flow more reliably through the load.

The present invention also provides the same effects as the first and second aspects.

A fourth aspect of the present invention is a program that causes a computer (46, 68) to execute the power supply control method of the third aspect.

A fifth aspect of the present invention is a storage medium (86) that stores the program of the fourth aspect.

It should be noted that the present invention is not limited to the above disclosure, and can adopt various configurations without departing from the gist of the present invention.

Claims

A power supply device (10) that outputs electric power to the outside,
a first power storage unit (40);
a second power storage unit (62);
a first power transmission path (16) connecting the first power storage unit and a load connection (28) to which a load (38) is connected;
a second power transmission path (18) connecting the second power storage unit and the load connection unit;
a first power conversion unit (60) arranged on the first power transmission path and configured to convert power supplied from the first power storage unit;
a second power conversion unit (82) arranged on the second power transmission path and configured to convert power supplied from the second power storage unit;
a first control unit (46) that controls the first power conversion unit;
a second control unit (68) that controls the second power conversion unit;
with
the first power storage unit and the second power storage unit are connected in parallel to the load connection unit,
The first control unit has a first decreasing characteristic such that the first output voltage output from the first power converting unit gradually decreases as the first output current output from the first power converting unit increases. Based on, controlling the first power conversion unit,
The second control unit has a second step-down characteristic such that the second output voltage output from the second power conversion unit gradually decreases as the second output current output from the second power conversion unit increases. Based on, controlling the second power conversion unit,
The power supply device, wherein the first gradual decrease characteristic and the second gradual decrease characteristic are set to be different from each other.
The power supply device according to claim 1,
The power supply device, wherein the first control unit controls the first power conversion unit such that the first output voltage and the second output voltage are equal.
The power supply device according to claim 1 or 2,
The first control unit controls the first power storage unit so that the first output current is greater than the second output current when the power storage amount of the first power storage unit is less than the power storage amount of the second power storage unit. 1 A power supply device that controls a power converter.
The power supply device according to claim 1 or 2,
The first control unit controls the first power storage unit so that the first output current is greater than the second output current when the power storage amount of the first power storage unit is greater than the power storage amount of the second power storage unit. 1 A power supply device that controls a power converter.
In the power supply device according to any one of claims 1 to 4,
a stored electricity amount acquisition unit (46, 68) that acquires at least one of the stored electricity amount of the first electricity storage unit and the electricity storage amount of the second electricity storage unit;
When the stored electricity amount acquired by the stored electricity amount acquisition unit becomes equal to or less than a first predetermined value (SOCth1, SOCth3), the user, owner, or a notification unit for notifying an administrator;
A power supply, further comprising:
In the power supply device according to claim 5,
a power consumption acquisition unit (46, 68) for acquiring the power consumption of the load;
a time point when the stored electricity amount becomes equal to or less than a second predetermined value (SOCth1, SOCth3) based on the stored electricity amount obtained by the electricity storage amount obtaining unit and the power consumption amount obtained by the electricity consumption amount obtaining unit; or , a calculation unit (46, 68) for calculating a period from the current time to the time when the charged amount becomes equal to or less than the second predetermined value;
A power supply, further comprising:
In the power supply device according to any one of claims 1 to 6,
The first control unit controls the first power conversion unit based on a first drooping characteristic such that the first output voltage sharply decreases when the first output current is equal to or greater than a third predetermined value (Ith0). death,
The second control unit controls the second power conversion unit based on a second drooping characteristic such that the second output voltage sharply decreases when the second output current is equal to or greater than a fourth predetermined value (Itha). power supply.
In the power supply device according to any one of claims 1 to 7,
A power supply device, further comprising: a receiving unit (54, 76) for receiving a user's request regarding a mode of use of power stored in at least one of the first power storage unit and the second power storage unit.
The power supply device according to claim 8,
At least one of the first control unit and the second control unit controls at least one of the first power conversion unit and the second power conversion unit based on the request received by the receiving unit. A power supply that controls one of the power converters.
The power supply device according to claim 8 or 9,
The power supply device, wherein the receiving unit is capable of communicating with the mobile terminal (26) of the user and receives the request input by the user to the mobile terminal.
In the power supply device according to any one of claims 8 to 10,
The power supply device, wherein the receiving unit receives the request for shared power shared by at least one of the first power storage unit and the second power storage unit with respect to the power consumption of the load.
In the power supply device according to any one of claims 1 to 11,
The power supply device, wherein the first power storage unit and the second power storage unit are detachable from the power supply device.
In the power supply device according to any one of claims 1 to 12,
a first housing (22) housing the first power storage unit, the first power conversion unit, and the first control unit;
a second housing (24) housing the second power storage unit, the second power conversion unit, and the second control unit;
A power supply, further comprising:
14. The power supply device of claim 13, wherein
The power supply device, wherein the first control unit and the second control unit are provided so as to be able to communicate with each other.
A power supply device (14) comprising a second power storage unit connected in parallel to the first power storage unit with respect to the load when the first power storage unit and the load are connected via a first power transmission path. and
a second power transmission path connecting the second power storage unit and the load;
a power conversion unit (82) arranged in the second power transmission path and configured to convert power supplied from the second power storage unit;
a control unit (68) that controls the power conversion unit;
with
Based on a third decreasing characteristic such that the first output current output from the first power transmission path gradually decreases as the first output voltage output from the first power transmission path increases, the first power storage unit outputs power,
The control unit controls the power conversion unit based on a fourth decreasing characteristic such that the second output current output from the power conversion unit gradually decreases as the second output voltage output from the power conversion unit increases. to control the
The power supply device, wherein the fourth gradually decreasing characteristic is set to be different from the third gradually decreasing characteristic.
16. The power supply device of claim 15, wherein
Further comprising a voltage acquisition unit (68) that acquires the first output voltage,
The control unit controls the power conversion unit to convert a first state quantity correlated with the frequency of the second output voltage and a second state quantity correlated with the phase of the second output voltage into the voltage A power supply device that controls to match the first output voltage acquired by the acquisition unit.
17. The power supply device of claim 16, wherein
The control unit controls the power conversion unit so that a third state quantity correlated with the amplitude of the second output voltage matches the first output voltage acquired by the voltage acquisition unit. , power supply.
A control method for a power supply that outputs power to the outside, comprising:
The power supply device includes: a first power storage unit; a second power storage unit; a first power transmission path connecting the first power storage unit and a load connection unit to which a load is connected; a second power transmission path that connects a load connecting portion; a first power conversion portion that is arranged in the first power transmission path and converts power supplied from the first power storage unit; and the second power transmission path. A second power conversion unit arranged in a second power storage unit that converts power supplied from the second power storage unit, and a control unit that controls the first power conversion unit and the second power conversion unit,
the first power storage unit and the second power storage unit are connected in parallel to the load connection unit,
The control method is
By controlling the first power conversion unit based on the first step-down characteristic, as the first output current output from the first power conversion unit increases, the first power conversion unit output from the first power conversion unit stepping down the output voltage;
By controlling the second power conversion unit based on a second step-down characteristic different from the first step-down characteristic, the second power is increased as the second output current output from the second power conversion unit increases. stepping down the second output voltage output from the conversion unit;
A control method for a power supply device, comprising:
A program for causing a computer (46, 68) to execute the power supply control method according to claim 18.
A storage medium (86) for storing the program according to claim 19.