CN111211599B - Energy feedback management system and control method of fan variable pitch system - Google Patents
Energy feedback management system and control method of fan variable pitch system Download PDFInfo
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- CN111211599B CN111211599B CN202010090932.5A CN202010090932A CN111211599B CN 111211599 B CN111211599 B CN 111211599B CN 202010090932 A CN202010090932 A CN 202010090932A CN 111211599 B CN111211599 B CN 111211599B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1438—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in combination with power supplies for loads other than batteries
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Abstract
An energy feedback management system and a control method of a fan variable pitch system are disclosed, wherein the system comprises a direct current bus voltage acquisition circuit, a direct current bus voltage judgment processing module, a super capacitor charging circuit and a lubrication unit power supply circuit; and comparing the direct current bus voltage with a preset voltage, selecting to start or stop the super capacitor charging circuit and/or the lubricating unit power supply circuit according to the comparison result, and completing braking energy recovery by adopting the super capacitor module to charge and/or the lubricating unit to supply power. When the variable-pitch motor is in braking operation, the generated motor braking energy is stored in the super capacitor module (a backup power supply of the variable-pitch system) or the lubricating unit is started, so that the energy feedback generated when the motor generates electricity can be effectively controlled, the aim of inhibiting the rise of the direct-current bus voltage is fulfilled, the energy waste is further avoided, and the electricity and the energy are saved.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to an energy feedback management system and a control method of a fan variable pitch system.
Background
The variable pitch system of the wind generating set is mainly used for adjusting the size of the pitch angle of the blade, the control of the pitch angle of the blade of the fan is usually realized by adopting an alternating current servo driving system, the alternating current servo driving system is mainly composed of an alternating current servo motor and an alternating current servo driver, and the alternating current servo motor is generally a permanent magnet synchronous motor. When the synchronous motor is braked, the motor is in a power generation state. This means that energy will be returned to the dc bus of the servo driver. Because the dc bus includes a filter capacitor, the dc bus voltage will rise. How much the voltage increases depends on the kinetic energy of the motor at the start of braking and the capacity of the capacitor on the dc bus. Therefore, excessive bus voltage needs to be protected, otherwise, power components and bus filter capacitors can be damaged.
The conventional economic way to avoid the rise of the dc bus voltage is to consume this energy by the driver through the braking resistor. In order to realize resistance braking, the consumption of braking energy is usually realized by controlling the switching on of the bridge arm of the switching tube, as shown in fig. 1. When the bus voltage is detected to exceed the starting fixed value of the brake resistor, the bridge arm of the brake switch tube is conducted, and the brake resistor RB is connected to the direct-current bus to perform energy consumption braking; and when the bus voltage is detected to be lower than the braking resistor turn-off fixed value, cutting the braking resistor RB out of the direct current bus. In the braking process of the motor, the braking energy is simply converted into the heat energy of the braking resistor for consumption, so that the feedback utilization of the energy cannot be realized, and the improvement of the efficiency of the whole variable pitch system is not facilitated.
The Chinese patent with the publication number of CN109525121A provides a braking energy feedback control method for a power conversion circuit of a fan electric variable pitch system, when a variable pitch motor is in braking operation, the braking energy of the variable pitch motor is directly fed back to an alternating current power grid, and the purpose of energy conservation is achieved without braking resistance consumption; however, the control difficulty of the feedback energy and the grid connection of the power grid is high, the structure is complex, and if the grid connection control is unreasonable, a driver can be damaged or the phenomenon that the power grid is pulled down can occur, so that potential safety hazards exist. And the network side power conversion circuit part adopts a three-phase bridge rectifier circuit structure consisting of six IGBT switching devices, and compared with a diode uncontrollable three-phase bridge rectifier structure, the cost is high.
Disclosure of Invention
The invention aims to provide an energy feedback management system and an energy feedback control method of a fan variable pitch system, aiming at the problems that the feedback energy cannot be effectively utilized and can only be converted into heat energy for consumption, so that the aim of inhibiting the rise of the direct current bus voltage is fulfilled, the waste of energy is further avoided, and the electricity and the energy are saved.
In order to achieve the above object, a first aspect of the present invention provides an energy feedback management system for a fan pitch control system, including a dc bus voltage obtaining circuit, a dc bus voltage determining and processing module, a super capacitor charging circuit, and a lubrication unit power supply circuit;
the direct-current bus voltage acquisition circuit, the super capacitor charging circuit and the lubricating unit power supply circuit are connected to two ends of the direct-current bus in parallel;
the direct current bus voltage acquisition circuit is used for acquiring the direct current bus voltage of the driver and transmitting the direct current bus voltage to the direct current bus voltage judgment processing module;
and the direct current bus voltage judgment processing module judges the magnitude of the direct current bus voltage so as to determine to start the super capacitor charging circuit and/or start the lubricating unit power supply circuit.
Further, the direct current bus voltage acquisition circuit comprises a resistance voltage division module and a bus voltage detection unit;
the resistance voltage division module comprises a voltage division resistor and a sampling resistor which are connected in series, and obtains output voltage from a voltage division point between the voltage division resistor and the sampling resistor and provides the output voltage to the bus voltage detection unit;
the bus voltage detection unit detects the voltage of a voltage division point, and transmits the voltage to the direct current bus voltage judgment processing module after isolation and amplification.
Further, the dc bus voltage judgment processing module includes a digital signal processor, and is configured to process and restore an actual dc bus voltage, judge a magnitude of the dc bus voltage, and perform corresponding processing:
when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor;
when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started;
and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
Further, the first preset voltage is smaller than a third preset voltage; the value of the second preset voltage is higher than the normal working voltage value of the direct-current bus; the third preset voltage is lower than the dynamic braking starting voltage.
Further, the timely starting of the super capacitor charging circuit according to the current voltage value of the super capacitor comprises:
and if the current voltage value of the super capacitor is lower than the voltage starting charging threshold value of the super capacitor, starting the super capacitor charging circuit.
Further, the super capacitor charging circuit comprises a charging module and a super capacitor module;
the charging module and the super capacitor module are connected in series and then connected to two ends of the direct current bus in parallel;
the charging module comprises a charging relay contact, a charging resistor and a backward diode;
the charging relay contact is connected with the charging resistor in series and then connected between the positive pole of the direct current bus and the positive pole of the super capacitor module in parallel with the backward diode;
the reverse diode prevents the super capacitor from being charged reversely;
and/or the lubricating unit power supply circuit comprises a switching power supply, an electronic switch and a lubricating unit;
the switch power supply adopts a direct current bus for power supply and is used for converting bus voltage into a 24V direct current output power supply for supplying power to the lubricating unit;
the electronic switch is connected between the negative electrode of the switching power supply and the negative electrode of the lubricating unit.
The second aspect of the present invention provides an energy feedback control method for a fan pitch control system, including the following steps:
presetting a first preset voltage, a second preset voltage and a third preset voltage;
acquiring the direct current bus voltage of a driver;
comparing the DC bus voltage with a preset voltage to obtain a comparison result,
and determining whether to start the super capacitor charging circuit and/or the lubricating unit power supply circuit according to the comparison result.
Further, the step of determining whether to activate the super capacitor charging circuit and/or the lubrication unit power supply circuit according to the comparison result comprises:
when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor;
when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started;
and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
Further, the first preset voltage is smaller than a third preset voltage; the value of the second preset voltage is higher than the normal working voltage value of the direct-current bus; the third preset voltage is lower than the dynamic braking starting voltage.
Further, the timely starting of the super capacitor charging circuit according to the current voltage value of the super capacitor comprises:
and if the current voltage value of the super capacitor is lower than the voltage starting charging threshold value of the super capacitor, starting the super capacitor charging circuit.
In summary, the present invention provides an energy feedback management system and an energy feedback control method for a fan pitch control system, where the system includes a dc bus voltage obtaining circuit, a dc bus voltage determining and processing module, a super capacitor charging circuit, and a lubrication unit power supply circuit; comparing the direct current bus voltage with a preset voltage, and starting the super capacitor charging circuit in due time according to the current voltage value of the super capacitor when the current direct current bus voltage is greater than the first preset voltage and less than the third preset voltage; when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, a lubricating unit power supply circuit is started, and the super capacitor module charging and lubricating unit power supply are adopted to jointly complete braking energy recovery; and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
When the variable-pitch motor is in braking operation, the generated motor braking energy is stored in the super capacitor module (a backup power supply of the variable-pitch system) or the lubricating unit is started, so that the energy feedback generated when the motor generates electricity can be effectively controlled, the aim of inhibiting the rise of the direct-current bus voltage is fulfilled, the energy waste is further avoided, and the electricity and the energy are saved.
Drawings
FIG. 1 is a schematic diagram of a prior art motor energy feedback energy consumption braking circuit;
FIG. 2 is a block diagram of an energy feedback management system according to the present invention;
FIG. 3 is a schematic diagram of a super capacitor charging circuit according to the present invention;
FIG. 4 is a schematic diagram of a power supply circuit of the lubrication unit according to the present invention;
fig. 5 is a flowchart illustrating an energy feedback control method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first aspect of the present invention provides an energy feedback management system of a fan pitch control system, as shown in fig. 2, the energy feedback management system includes a dc bus voltage obtaining circuit, a dc bus voltage determining and processing module, a super capacitor charging circuit, and a lubrication unit power supply circuit; the direct-current bus voltage acquisition circuit, the super capacitor charging circuit and the lubricating unit power supply circuit are connected in parallel at two ends of a positive electrode 1 and a negative electrode 2 of the direct-current bus; the direct current bus voltage acquisition circuit is used for acquiring the direct current bus voltage of the driver and transmitting the direct current bus voltage to the direct current bus voltage judgment processing module; and the direct-current bus voltage judgment processing module judges the magnitude of the direct-current bus voltage so as to determine to start the super capacitor charging circuit and/or start the lubricating unit power supply circuit.
Further, the dc bus voltage obtaining circuit includes a resistance voltage dividing module and a bus voltage detecting unit, as shown in fig. 3, and fig. 3 shows an example of the dc bus voltage obtaining circuit and the super capacitor charging circuit of the energy feedback management system. The circuit comprises a direct current bus anode 1, and the direct current bus anode 1 and a direct current bus cathode 2 jointly form direct current bus voltage. The filter capacitor 3 is connected in parallel between the direct current bus voltage anode 1 and the direct current bus cathode 2, and comprises one or more capacitors, which can be electrolytic capacitors.
The resistance voltage division module comprises a voltage division resistor 21 and a sampling resistor 22 to divide the voltage of the direct current bus. The divider resistor 21 has a relatively high resistance (MW-level resistance) to reduce the power consumption of the resistor 21. The output voltage is taken from the voltage division point 20 of the voltage divider and supplied to the bus voltage detection unit 23. The bus voltage detection unit 23 is used to detect the voltage of the voltage dividing point 20 of the resistance voltage dividing module, and send the acquired result to the digital signal processor 24 (i.e. the dc bus voltage judgment processing module) after isolation and amplification.
Further, the super capacitor charging circuit comprises a charging module 10 and a super capacitor module 16. The charging module 10 is connected between the positive electrode 1 of the direct current bus and the positive electrode 14 of the super capacitor module 16; and the cathode 15 of the super capacitor module is in short circuit with the cathode 2 of the direct current bus. The dc bus voltage charges the supercapacitor module 16 through the charging module 10.
The charging module 10 comprises a supercapacitor charge relay contact 11 and a charging resistor 12. The contact 11 of the super capacitor charging relay is connected between the charging resistor 12 and the positive pole 1 of the direct current bus, the contact of the super capacitor charging relay is connected with the charging resistor in series, and the contact can be opened or closed according to the change of the voltage value of the direct current bus. The charging resistor 12 is connected between the contact 11 of the super capacitor charging contactor and the anode 14 of the super capacitor module, is a power resistor and comprises one or more resistors, and the resistors are connected together in series; the one or more resistors are die cast aluminum resistors. When detecting that the bus voltage is greater than the starting super capacitor charging threshold (the first preset voltage value is 700V, and is lower than the third preset voltage value), a super capacitor charging relay (not shown) is started, the contact of the super capacitor charging relay is closed, the direct current bus voltage starts to charge the super capacitor module 16 through the charging resistor 12, and the parameter of the charging resistor is selected according to the current flowing in when the capacitor is charged. The charging module 10 further comprises a reverse diode 13 connected in parallel between the charging contact 11 and the charging resistor 12, so that reverse charging through the super capacitor module is prevented when the voltage of the direct-current bus is reduced, and a backup power supply is provided for the variable pitch system by the super capacitor module when the alternating-current input power supply is powered off by utilizing the one-way conductivity of the diode.
Further, the dc bus voltage determining and processing module includes a digital signal processor 24, and is configured to process and restore the actual dc bus voltage, determine the magnitude of the dc bus voltage, and perform corresponding processing: when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor; when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started; and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
Specifically, the digital signal processor 24 amplifies the acquisition signal sent by the bus voltage detection unit 23 by a certain factor to generate an actual dc bus voltage value, and determines whether the super capacitor charging relay is turned on or not according to the actual dc bus voltage value. When the motor is in a power generation state, the voltage of the direct current bus rises, when an actual bus voltage value exceeds the charging threshold voltage of the super capacitor, the processor sends a control command to close the contact of the super capacitor charging relay, the charging resistor is connected into a charging loop to charge the super capacitor module, the voltage value of the direct current bus drops, when the voltage value of the bus drops to a stop super capacitor charging threshold value (a second preset voltage value is 640V and is higher than a normal working voltage value threshold value of the direct current bus, 630V), the processor sends a command to disconnect the contact of the super capacitor charging relay, and the super capacitor module stops charging. The brake feedback energy is stored in the super capacitor module, so that the energy is recycled, and the electricity and the energy are saved.
Further, the first preset voltage is smaller than a third preset voltage; the value of the second preset voltage is higher than the normal working voltage value of the direct-current bus; the third preset voltage is lower than the dynamic braking starting voltage.
Further, the lubrication unit power supply circuit comprises a switching power supply, an electronic switch and a lubrication unit, as shown in fig. 4. The switch power supply adopts a direct current bus for power supply and is used for converting bus voltage into a 24V direct current output power supply for supplying power to the lubricating unit; the electronic switch is connected between the negative pole of the switching power supply and the negative pole of the lubricating unit, and comprises a power field effect transistor or an insulated gate bipolar transistor. Specifically, the dc bus positive electrode 1 and the dc bus negative electrode 2 form a dc bus voltage, and the switching power supply 30 is powered by the dc bus voltage. The 24V positive electrode 31 of the switching power supply output is connected with the positive electrode 33 of the lubrication power supply unit, and the 24V negative electrode of the switching power supply output is connected with the negative electrode 34 of the lubrication power supply unit through the electronic switch 36. The electronic switch 36 opens or closes the lubrication power supply unit 35 according to the change of the dc bus voltage value (the dc bus voltage detection method is the same as that in fig. 3, and is not shown here). When detecting that the bus voltage is greater than a starting power supply threshold value (a third preset voltage value is 750V and is lower than an energy consumption braking starting voltage value 770V) of the lubricating unit, the digital signal processor sends a high-level signal for closing the electronic switch, the electronic switch is closed, the direct-current bus voltage starts to supply power to the lubricating unit through the switching power supply, the lubricating unit starts, and the direct-current bus voltage value decreases; when the voltage value of the bus is reduced to a stop starting threshold value (a second preset voltage value is 640V and is higher than a normal working voltage value threshold value of the direct current bus, namely 630V), the processor sends a low level signal for disconnecting the electronic switch, the electronic switch is disconnected, the lubrication unit is stopped to supply power, the recycling of braking energy is achieved, and the efficiency of the whole variable pitch system is improved.
The second aspect of the present invention provides an energy feedback control method for a fan pitch control system, as shown in fig. 5, including the following steps:
in step S1, a first preset voltage, a second preset voltage and a third preset voltage are preset.
When the preset voltage is obtained, the value of a second preset voltage is determined according to the amplitude of the safe working voltage threshold, and the amplitude of the second preset voltage is higher than that of the normal working voltage threshold of the direct-current bus; the third predetermined voltage is greater than the first predetermined voltage but should be less than the dynamic brake initiation voltage.
And step S2, acquiring the direct current bus voltage of the driver.
Specifically, a voltage U1 is extracted from the dc bus voltage; the voltage of the direct current bus is reduced through a voltage divider, a scaling ratio is obtained according to the proportion of a voltage dividing resistor and a sampling resistor, the proportion of the voltage dividing resistor and the sampling resistor is 4000:1, the scaling ratio of the voltage is obtained to be 1/4001, the direct current bus voltage of the driver is constantly changed, the direct current bus voltage of the driver needs to be collected at any time, the value collected each time is a fixed value, defined as Vbus, and the voltage U1 is obtained by multiplying the Vbus by the voltage scaling ratio. Then the extracted voltage is converted into a sampling voltage U2 through an isolation amplifying circuit and is directly sent to a digital signal processor, and the processor generates an actual direct current bus voltage Udc through filtering and amplifying.
And step S3, comparing the DC bus voltage with a preset voltage to obtain a comparison result. Specifically, the processor generates an actual bus voltage Udc through filtering and amplifying, and compares the actual bus voltage Udc with the preset voltage to obtain a comparison result.
And step S4, determining whether to start the super capacitor charging circuit and/or the lubricating unit power supply circuit according to the comparison result.
Further, the step S4 of determining whether to activate the super capacitor charging circuit and/or the lubrication unit power supply circuit according to the comparison result includes: when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor; when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started; and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
Specifically, if the bus voltage Udc is greater than the first preset voltage VREF1, the driver enters an energy feedback super capacitor charging management state; and if the bus voltage Udc is less than the second preset voltage VREF2, the driver exits the energy feedback super capacitor charging management state.
If the bus voltage Udc is greater than the third preset voltage VREF3, the driver enters an energy feedback lubrication unit power supply management state; and if the bus voltage Udc is less than the second preset voltage VREF2, the driver exits the power supply management state of the energy feedback lubrication unit.
And the processor judges whether charging is available or not according to the comparison result, and controls the charging relay to be closed when the charging is judged to be available, so that energy recovery is realized.
When the driver enters an energy feedback super capacitor charging management state, if the voltage value of the super capacitor is lower than the voltage starting charging threshold value of the super capacitor, the processor sends a charging command, at the moment, the contact of the charging relay is closed, the charging resistor is connected to the charging circuit to work, and feedback energy recovery is started. And when the voltage of the direct current bus falls to a second preset value or the voltage of the capacitor rises to the voltage of the super capacitor to stop the charging threshold, disconnecting the contact of the charging relay to stop energy recovery.
When the energy of the driver is fed back to the power supply management state of the lubricating unit, the processor sends a starting command of the lubricating unit, at the moment, the electronic switch is closed, the lubricating unit is started, and the feedback energy utilization is started. And when the voltage of the direct current bus falls to a second preset value, the electronic switch is switched off, and the feedback energy utilization is stopped.
In summary, the present invention provides an energy feedback management system and an energy feedback control method for a fan pitch control system, where the system includes a dc bus voltage obtaining circuit, a dc bus voltage determining and processing module, a super capacitor charging circuit, and a lubrication unit power supply circuit; comparing the direct current bus voltage with a preset voltage, and starting the super capacitor charging circuit in due time according to the current voltage value of the super capacitor when the current direct current bus voltage is greater than the first preset voltage and less than the third preset voltage; when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, a lubricating unit power supply circuit is started, and the super capacitor module charging and lubricating unit power supply are adopted to jointly complete braking energy recovery; and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
When the variable-pitch motor is in braking operation, the generated motor braking energy is stored in the super capacitor module (a backup power supply of the variable-pitch system) or the lubricating unit is started, so that the energy feedback generated when the motor generates electricity can be effectively controlled, the aim of inhibiting the rise of the direct-current bus voltage is fulfilled, the energy waste is further avoided, and the electricity and the energy are saved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. An energy feedback management system of a fan variable pitch system is characterized by comprising a direct current bus voltage acquisition circuit, a direct current bus voltage judgment processing module, a super capacitor charging circuit and a lubrication unit power supply circuit;
the direct-current bus voltage acquisition circuit, the super capacitor charging circuit and the lubricating unit power supply circuit are connected to two ends of the direct-current bus in parallel;
the direct current bus voltage acquisition circuit is used for acquiring the direct current bus voltage of the driver and transmitting the direct current bus voltage to the direct current bus voltage judgment processing module;
the direct current bus voltage judgment processing module judges the magnitude of the direct current bus voltage so as to determine to start a super capacitor charging circuit and/or start a lubricating unit power supply circuit;
the direct current bus voltage judging and processing module comprises a digital signal processor and is used for processing and restoring actual direct current bus voltage, judging the magnitude of the direct current bus voltage and carrying out corresponding processing:
when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor;
when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started;
and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
2. The energy feedback management system of a wind turbine pitch system of claim 1, wherein the dc bus voltage acquisition circuit comprises a resistance voltage divider module and a bus voltage detection unit;
the resistance voltage division module comprises a voltage division resistor and a sampling resistor which are connected in series, and obtains output voltage from a voltage division point between the voltage division resistor and the sampling resistor and provides the output voltage to the bus voltage detection unit;
the bus voltage detection unit detects the voltage of a voltage division point, and transmits the voltage to the direct current bus voltage judgment processing module after isolation and amplification.
3. The wind turbine pitch system energy feedback management system of claim 1, wherein the first predetermined voltage is less than a third predetermined voltage; the value of the second preset voltage is higher than the normal working voltage value of the direct-current bus; the third preset voltage is lower than the dynamic braking starting voltage.
4. The wind turbine pitch system energy feedback management system of claim 1, wherein timely activating the supercapacitor charge circuit based on the current supercapacitor voltage value comprises:
and if the current voltage value of the super capacitor is lower than the voltage starting charging threshold value of the super capacitor, starting the super capacitor charging circuit.
5. The wind turbine pitch system energy return management system of claim 1,
the super capacitor charging circuit comprises a charging module and a super capacitor module;
the charging module and the super capacitor module are connected in series and then connected to two ends of a direct current bus;
the charging module comprises a charging relay contact, a charging resistor and a backward diode; the charging relay contact is connected with the charging resistor in series and then connected between the positive pole of the direct current bus and the positive pole of the super capacitor module in parallel with the backward diode; the reverse diode prevents the super capacitor from being charged reversely;
and/or the presence of a gas in the gas,
the lubricating unit power supply circuit comprises a switching power supply, an electronic switch and a lubricating unit;
the switch power supply adopts a direct current bus for power supply and is used for converting bus voltage into a 24V direct current output power supply for supplying power to the lubricating unit;
the electronic switch is connected between the negative electrode of the switching power supply and the negative electrode of the lubricating unit.
6. An energy feedback control method of a fan variable pitch system is characterized by comprising the following steps:
presetting a first preset voltage, a second preset voltage and a third preset voltage;
acquiring the direct current bus voltage of a driver;
comparing the DC bus voltage with a preset voltage to obtain a comparison result,
determining whether to start a super capacitor charging circuit and/or a lubricating unit power supply circuit according to the comparison result;
the step of determining whether to start the super capacitor charging circuit and/or the lubricating unit power supply circuit according to the comparison result comprises the following steps:
when the voltage of the direct current bus is greater than the first preset voltage and less than the third preset voltage, the super capacitor charging circuit is started timely according to the current voltage value of the super capacitor;
when the voltage of the direct current bus is greater than a third preset voltage, a super capacitor charging circuit is started timely according to the current voltage value of the super capacitor, and a lubrication unit power supply circuit is started;
and when the voltage of the direct current bus is less than a second preset voltage, stopping the super capacitor charging circuit and/or the lubricating unit power supply circuit.
7. The method of claim 6, wherein the first predetermined voltage is less than a third predetermined voltage; the value of the second preset voltage is higher than the normal working voltage value of the direct-current bus; the third preset voltage is lower than the dynamic braking starting voltage.
8. The method of claim 6, wherein the timely starting of the supercapacitor charge circuit according to the current supercapacitor voltage value comprises:
and if the current voltage value of the super capacitor is lower than the voltage starting charging threshold value of the super capacitor, starting the super capacitor charging circuit.
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