KR101061220B1 - Method for monitoring solar power plant, and monitoring device used therein - Google Patents

Abstract

PURPOSE: A method and device for monitoring a solar power plant are provided to increase the generation efficiency of the solar power plant by monitoring main components of the solar power plant in real time. CONSTITUTION: A receiver of a monitoring device receives external information from an inverter, a connector, and a solar array(S310). The external information is stored in a storing unit of the monitoring device(S320). A determining unit of the monitoring device compares a temperature value of the external information with a reference value stored in the storage unit(S330). The determining unit determines the replacement or check timing of each component based on component state information(S340). A transmitter transmits a control signal to a corresponding distributer(S350). The monitoring device displays a message which shows the name, replacement and check of the corresponding component(S360). The determining unit determines the abnormal state of each solar array based on voltage and current values(S370). The display unit displays the abnormal state of a specific array(S380).

Description

Monitoring method for solar power plant and monitoring device used therein {Method for Monitoring Solar Power Plant, and Monitoring Device Used Therein}

The present invention relates to a method for monitoring a photovoltaic plant and a monitoring device used therein. More particularly, the present invention relates to monitoring of the state of major components of a photovoltaic plant in real time and to increasing the lifespan of each component. The present invention relates to a monitoring method for a photovoltaic power generation facility for increasing power generation efficiency of a power generation facility and a monitoring device used therefor.

In recent years, with the development of environment-friendly energy, technical interest in photovoltaic power generation facilities as an alternative energy technology is attracting.

However, the photovoltaic related technology according to the prior art has been developed with the focus only on the individual performance improvement of each module constituting the photovoltaic power generation equipment, and a technique for improving the overall operational efficiency of the photovoltaic power generation equipment. There was almost no development.

Accordingly, an object of the present invention is to monitor the status of major components of a photovoltaic plant in real time and to increase the service life of each component and at the same time increase the power generation efficiency of the photovoltaic plant monitoring method and It is to provide a monitoring device used for this.

According to an aspect of the present invention, there is provided a method of monitoring a photovoltaic power generation facility, the monitoring device comprising: an external information receiving step of receiving, by a monitoring device, state information including a part temperature inside an inverter from an inverter; And a maintenance determination step of determining, by the monitoring apparatus, whether a component replacement and / or inspection is necessary inside the inverter based on the received external information.

Preferably, the step of receiving external information includes the step of the monitoring device receiving a temperature value of the solar array from the solar array.

In addition, the maintenance determination step, the monitoring device includes the step of determining whether the temperature value of the solar array exceeds a predetermined reference value.

The monitoring apparatus may further include controlling the ejector installed adjacent to the solar array such that the coolant is ejected to the solar array when it is determined that the temperature value of the solar array exceeds a predetermined reference value. .

The external information receiving step may include receiving, by the monitoring apparatus, a voltage value and a current value input from the photovoltaic array from a connection panel to which the voltage and current generated in the photovoltaic array are input. The determining step may include determining, by the monitoring apparatus, whether the solar array is abnormal based on the received voltage value and current value.

The monitoring apparatus may further include indicating that the parts need to be replaced and / or inspected if the monitoring device determines that the internal parts need to be replaced and / or inspected.

The internal component may be at least one of an electromagnetic contactor, a choke, and an insulated gate bipolar transistor, and the state information may include at least one of a number of contacts of the electromagnetic contactor, a temperature of the choke, and a temperature of the insulated gate bipolar transistor. do.

On the other hand, the monitoring device of the solar power plant according to the present invention, the receiving unit for receiving state information including the temperature of the parts inside the inverter from the inverter; And a determining unit determining whether the parts need to be replaced and / or inspected in the inverter based on the received external information.

Preferably, the receiving unit, characterized in that for further receiving a temperature value of the solar array from the solar array.

The determination unit may further determine whether the temperature value of the solar array exceeds a predetermined reference value.

The determining unit may further include a controller configured to control a ejector installed adjacent to the solar array such that the coolant is ejected to the solar array when the temperature value of the solar array exceeds a predetermined reference value. .

The receiving unit may receive a voltage value and a current value input from the solar array from a connection panel to which a voltage and a current generated in the solar array are input, and the determination unit is based on the received voltage value and current value. To determine whether the solar array is abnormal.

The determining unit may further include a display unit which indicates that the component replacement and / or inspection is necessary when it is determined that the replacement and / or inspection of the internal component is necessary.

The internal component may be at least one of an electromagnetic contactor, a choke, and an insulated gate bipolar transistor, and the state information may include at least one of a number of contacts of the electromagnetic contactor, a temperature of the choke, and a temperature of the insulated gate bipolar transistor. do.

According to the present invention, it is possible to monitor the state of the major components of the solar power plant in real time, increase the life time of each component and at the same time increase the power generation efficiency of the solar power plant.

1 is a structural diagram of a monitoring system of a solar power plant according to an embodiment of the present invention,
FIG. 2 is a functional block diagram showing the structure of the inverter in FIG. 1;
3 is a functional block diagram of the monitoring apparatus in FIG. 1, and
4 is a flowchart illustrating an operation principle of the monitoring system of the solar power plant according to the present invention.

Hereinafter, with reference to the drawings will be described the present invention in more detail. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a structural diagram of a monitoring system of a solar power installation according to an embodiment of the present invention. Referring to FIG. 1, the monitoring system for a solar power plant according to an embodiment of the present invention includes a solar array 50, a connection panel 300, an inverter 100, a place of use 70, and a monitoring device 200. , Supplier 450, and central control center 400.

First, a temperature sensor is attached to the solar array 50, and the temperature sensor measures the surface temperature of the solar array 50 in real time and transmits the same to the monitoring device 200.

The inverter 100 converts the direct current power transmitted from the solar array 50 into an alternating current, and transmits the converted alternating current to a user 70 such as a customer.

Meanwhile, the inverter 100 includes main components such as an internal electronic contactor, choke, and an insulated gate bipolar transistor (IGBT), and acquires state information including the temperature of the main internal components. This is converted into digital information and transmitted to the monitoring device 200.

In addition, the connection panel 300 is input to the voltage and current generated in the solar array 50, the connection panel 300 is input to the monitoring device 200 the voltage value and current value input from the solar array 50 Send in real time.

Meanwhile, the monitoring apparatus 200 receives various state information including the part temperature inside the inverter 100 from the inverter 100, and needs to replace or check a part inside the inverter 100 based on the received state information. Determine whether or not.

At the same time, the monitoring device 200 receives the temperature value of the photovoltaic array 50 from a temperature sensor attached to the photovoltaic array 50, and when it is determined that the temperature value exceeds a predetermined reference value, the sunlight The ejector installed adjacent to the solar array 50 is controlled so that the coolant may be ejected to the array 50.

In addition, the monitoring device 200 receives a voltage value and a current value input to the connection panel 300 from the solar array 50, and whether the solar array 50 is abnormal based on the voltage value and the current value. Judge.

In addition, the monitoring apparatus 200 stores control information when control is performed based on the above state information received from the solar array 50, the connection panel 300, and the inverter 100, and the corresponding external information. And it is periodically sent to the power supply company 450 and the central control center 400, such as KEPCO.

On the other hand, the central control center 400 receives the state information and control information of each solar power generation facility from each monitoring device 200 of the solar power generation facilities installed in various places, the operation status of each solar power installation installed in various places and The efficiency can be checked.

FIG. 2 is a functional block diagram showing the structure of the inverter in FIG. 2, the inverter 100 according to the present invention includes a component unit 110, a sensor unit 130, a conversion unit 150, and a transmission unit 170.

First, the component part 110 includes a main part inside the inverter 100, and the main part includes an electromagnetic contactor, a choke, an insulated gate bipolar transistor, and the like.

The sensor unit 130 includes a sensor for sensing the state information of the main components in the component unit 110, and specifically, for each phase of the choke temperature sensor and the insulated gate bipolar transistor that senses temperature for each phase of the choke. An IGBT temperature sensor for sensing the temperature, a counter for counting the number of contacts of the magnetic contactor, and the like.

The converting unit 150 converts the state information acquired through the sensor unit 130 into digital information, and transmits the part state digital information generated by the converting unit 150 to the monitoring apparatus 200.

3 is a functional block diagram of the monitoring apparatus in FIG. Referring to FIG. 3, the monitoring apparatus 200 according to the present invention includes a receiver 210, a storage 220, a determiner 230, a transmitter 260, a controller 250, and a display 240. do.

First, the receiver 210 receives state information including the temperature of components inside the inverter 100 from the inverter 100, or receives a temperature value of the solar array 50 from a temperature sensor installed in the solar array 50. Or the voltage value and current value input from the solar array 50 are received from the connection panel 300.

do. Such information including part state information in the inverter 100, a temperature value of the solar array 50, and a current value and a voltage value from the connection panel 300 are referred to as external information.

External information received by the receiving unit 210 is stored in the storage unit 220, in addition to the storage unit 220, the number of times of contact of the magnetic contactor inside the inverter 100 input by the administrator, the temperature of the choke, insulation Preferred reference values for the temperature of the gate bipolar transistor are stored.

In this way, the reference value stored in the storage unit 220 is used to determine when to replace or check the main parts by comparing with the state information of the main parts inside the inverter 100.

On the other hand, the determination unit 230 determines whether the replacement or inspection of parts inside the inverter 100 based on the received state information, or whether the temperature value of the sun and the array 50 exceeds a predetermined reference value. To judge.

When the determination unit 230 determines that the internal parts of the inverter 100 need to be replaced or checked, the display unit 240 displays a message indicating that the parts need to be replaced or checked, and the determination unit 230 displays the solar array. When it is determined that the temperature value of 50 exceeds a predetermined reference value, the controller 250 controls a signal for controlling an ejector installed adjacent to the solar array 50 so that the coolant is ejected from the solar array 50. After generating, the transmitter 260 transmits it to the corresponding ejector.

In addition, the determination unit 230 determines whether the solar array 50 is abnormal based on the voltage value and the current value received from the connection panel 300, and indicates that an abnormality has occurred in the specific solar array 50. If it is determined, the display unit 240 indicates that the corresponding solar array is in an abnormal state.

The determination unit 230 determines whether the solar array 50 is abnormal based on the voltage value and the current value received from the connection panel 300.

Meanwhile, the transmitter 260 periodically transmits external information and control information stored in the storage 220 to the supply company 450 and the central control center 400.

4 is a flowchart illustrating an operation principle of the monitoring system of the solar power plant according to the present invention. 1 to 4, the operation principle of the monitoring system of the solar power plant according to the present invention will be described. First, the receiver 210 of the monitoring device 200 includes an inverter 100 and a connection panel 300. And external information is received from the solar array 50 (S310).

Specifically, the sensor unit 130 of the inverter 100 obtains contact count information of the electromagnetic contactor in the component unit 110, temperature information of each phase of the choke, and temperature information of each phase of the insulated gate bipolar transistor, and obtains the sensor unit. The analog data which is the state information of each component obtained by 130 is transmitted to the conversion unit 150 in the inverter 100 (S320), the conversion unit 150 converts the analog data into digital data, and conversion When the state information of each component converted into digital data through the unit 150 is transmitted to the monitoring apparatus 200 through the transmitter 170, the receiver 210 of the monitoring apparatus 200 is in a state from the inverter 100. You will receive the information.

Meanwhile, when the temperature sensor installed in the solar array 50 senses the temperature of the surface of the solar array 50 in real time and transmits it to the monitoring device 200, the receiver 210 of the monitoring device 200 receives sunlight. The temperature value of the array 50 is received in real time.

In addition, the connection panel 300 is generated for each of the solar arrays 50 (for example, arrays 1,2, 3, and 4), and monitors values of voltages and currents input to the connection panel 300. 200, which is received by the receiver 210 of the monitoring apparatus 200.

Then, the external information received from the inverter 100 and the solar array 50 is stored in the storage unit 220 of the monitoring device 200 (S320). In the practice of the present invention, external information received from the inverter 100 and the solar array 50 may be displayed on the display unit 240 of the monitoring device 200 in real time.

Next, the determination unit 230 of the monitoring device 200 stores the temperature value of the solar array 50 in the received external information or a temperature value which is an average value for a predetermined period of the corresponding temperature value in the storage unit 220. It is determined whether or not the predetermined reference value is exceeded (S330).

If it is determined by the determination unit 230 that the temperature value of the photovoltaic array 50 exceeds a predetermined reference value, this may adversely affect the photovoltaic power generation efficiency due to the current temperature rise of the photovoltaic array 50. As such, in order to lower the surface temperature of the solar array 50, the control unit 250 may allow the coolant to be ejected from the ejector installed adjacent to the solar array 50 to the surface of the solar array 50. A control signal is generated, and the transmitter 260 transmits the control signal to the corresponding ejector (S350).

Next, the determination unit 230 determines whether the replacement or inspection time for each component has arrived based on the state information for each component received from the inverter 100 (S340).

On the other hand, in the above-described step S330, even if it is determined by the determination unit 230 that the temperature value of the photovoltaic array 50 does not exceed a predetermined reference value, the determination unit 230 is the next step in step S340 Run the step.

Specifically, in the storage unit 220 of the monitoring device 200, the reference value for the number of contacts of the electromagnetic contactor, the temperature of the choke, and the temperature of the insulated gate bipolar transistor is input and stored by the manager, and the determination unit 230 is determined. ) Determines whether the respective state values exceed the predetermined reference value based on the state information from the inverter 100.

On the other hand, in carrying out the present invention, the preferred reference value corresponds to 90% of the number of times of contact of the electromagnetic contactor, the temperature of the choke, and the temperature of the insulated gate bipolar transistor in the state of reaching the lifetime of each component. It would be desirable to set it to a value.

Accordingly, when it is determined that the state value of the specific part exceeds a predetermined reference value, the monitoring apparatus 200 needs to name the corresponding part whose state value exceeds the predetermined reference value and replace or inspect the corresponding part. The alarm message is generated at the same time as displaying a message for notifying (S360).

Accordingly, the administrator can increase the operational efficiency of the photovoltaic power generation equipment by extending the service life of the inverter 100 by performing replacement or inspection of the corresponding parts.

Next, the determination unit 230 of the monitoring device 200 is for each solar array 50 received by the receiving unit 210 and stored in the storage unit 220 in step S310 (for example, array 1, 2, 3, and 4 are respectively determined based on the values of the voltage and current generated in the connection panel 300 determines whether or not an abnormality occurs for each solar array (S370).

In this specification, a solar cell connected in series is called a solar array (or string), and a solar power generation facility in which a plurality of solar arrays are installed in parallel is assumed.

That is, when the voltage value and the current value generated for each solar array 50 are as shown in Table 1 below, the determination unit 230 determines that the state of all the arrays 50 is normal.

Voltage (Vdc) Current (Idc) Power (W) condition Warning 1st array 300 20 6000 normal - 2nd array 300 20 6000 normal - 3rd array 300 20 6000 normal - 4th array 300 20 6000 normal -

Specifically, when the power value calculated based on the voltage value and the current value in each array 50 is the same as shown in Table 1, the determination unit 230 indicates that each solar array 50 is in a normal state. You will be judged.

However, when the voltage value and the current value generated for each solar array 50 are as shown in Table 2 below, the determination unit 230 determines that the state of the second array is not normal.

Voltage (Vdc) Current (Idc) Power (W) condition Warning 1st array 300 20 6000 normal - 2nd array 100 20 2000 More than Occur 3rd array 300 20 6000 normal - 4th array 300 20 6000 normal -

Specifically, the determination unit 230 calculates the power value based on the voltage value and the current value in each array 50, and as a result, an array (first and first) different from the power value in the specific array (second array). When the power value and the difference value in the third and fourth arrays exceed a predetermined error range, it is determined that an abnormality has occurred in the corresponding array. Therefore, the display unit 240 has an abnormality in a specific array (second array). It indicates that it has occurred and generates an alarm sound (S380).

Meanwhile, in carrying out the present invention, the determination unit 230 does not calculate a power value, but compares only the voltage value (or current value) for each array 50 received from the connection panel 300 to determine a specific array. It may be determined whether an abnormality in voltage (or current) has occurred.

In this case, the determination unit 230 determines that a difference value between the voltage value in a specific array (second array) and the voltage value in another array (first, third, and fourth array) is a predetermined error range (for example, If it exceeds 10Vdc), it is determined that an abnormality in voltage occurs in the corresponding array, and the display unit 240 displays this.

On the other hand, in the practice of the present invention, the determination unit 230 presets the range of the voltage value and the range of the current value for each time zone for each array 50 in advance, the array having a value outside the set range is an array in which the abnormality It may be judged to be.

For example, the manager may set the voltage value of each array 50 in the normal range of 250 Vdc to 350 Vdc, and the manager may set the current value of each array 50 in the normal range of 15 Adc to 25 Adc at PM 12 pm. For example, the range of normal current values may be preset in each time zone.

The reason why the range of the normal current value is set for each time zone is that the voltage value in the solar array 50 has little variation with the solar radiation amount, but the current value has a large fluctuation range according to the variation in the solar radiation time period.

While the above has been shown and described with respect to preferred embodiments and applications of the present invention, the present invention is not limited to the specific embodiments and applications described above, the invention without departing from the gist of the invention claimed in the claims Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

50: solar array, 70: where used,
100: inverter, 110: parts
130: sensor unit, 150: conversion unit,
170: transmitter, 200: monitoring device,
210: receiving unit, 220: storage unit,
230: determination unit, 240: display unit,
250: control unit, 260: transmission unit,
300: access panel, 400: central control center,
450: Supplier.

Claims (14)

An external information receiving step of receiving, by the monitoring device, state information including a temperature of a component inside the inverter from the inverter;
A maintenance determination step of determining, by the monitoring apparatus, whether a component replacement or inspection inside the inverter is necessary based on the received external information;
Including;
The receiving of the external information may include receiving, by the monitoring apparatus, a voltage value and a current value input from the photovoltaic array from a connection panel to which the voltage and current generated in the photovoltaic array are input.
The maintenance determination step may include the step of the monitor device determining whether the solar array is abnormal based on the received voltage value and current value,
The determining of the abnormality of the solar array based on the received voltage value and the current value may include: an array having a range outside of a range of preset voltage values and current values for each array, wherein the array has an abnormality. Judged,
The range of the preset current value is monitored differently for each time zone of the day.
The method of claim 1,
The external information receiving step,
And monitoring by the monitoring device, a temperature value of the solar array from the solar array.
The method of claim 2,
The maintenance determination step,
And monitoring, by the monitoring device, whether the temperature value of the solar array exceeds a predetermined reference value.
The method of claim 3,
The monitoring apparatus further comprises the step of controlling the ejector installed adjacent to the solar array so that the cooling water is ejected to the solar array when it is determined that the temperature value of the solar array exceeds a predetermined reference value How to monitor power plants.
delete The method of claim 1,
The monitoring device further comprises the step of indicating that the replacement or inspection of the parts, if it is determined that the replacement or inspection of the internal parts is required.
The method of claim 1,
The internal component is at least one of an electronic contactor, a choke, an insulated gate bipolar transistor,
The state information is at least one of the number of times of contact of the electromagnetic contactor, the temperature of the choke, the temperature of the insulated gate bipolar transistor.
A receiver configured to receive status information including a part temperature inside the inverter from the inverter; And
A determination unit which determines whether a part replacement or inspection is necessary inside the inverter based on the received external information;
Including;
The receiving unit receives a voltage value and a current value input from the solar array from a connection panel to which the voltage and current generated in the solar array are input,
The determination unit determines whether the solar array is abnormal based on the received voltage value and current value,
The determination unit determines that an array having a value out of a range of a preset voltage value and a current value of each array is an array in which an abnormality occurs,
The range of the preset current value is the monitoring device of the solar power plant is set differently for each time of day.
The method of claim 8,
The receiving unit is a monitoring device for photovoltaic power generation equipment further receiving a temperature value of the photovoltaic array from the photovoltaic array.
10. The method of claim 9,
And the determination unit further determines whether or not a temperature value of the solar array exceeds a predetermined reference value.
The method of claim 10,
The determination unit further includes a control unit for controlling a ejector installed adjacent to the solar array when the temperature value of the photovoltaic array determines that the temperature value exceeds a predetermined reference value, the coolant is ejected to the photovoltaic array. Monitoring device for power generation facilities.
delete The method of claim 8,
And a display unit for indicating that the parts need to be replaced or inspected when the determination unit determines that the internal components need to be replaced or inspected.
The method of claim 8,
The internal component is at least one of an electronic contactor, a choke, an insulated gate bipolar transistor,
The state information is at least one of the number of contacts of the electromagnetic contactor, the temperature of the choke, the temperature of the insulated gate bipolar transistor.

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