KR102678293B1 - Solar power control panel with a plurality of DC breaker - Google Patents

Abstract

It relates to a solar power generation control panel having a plurality of DC breakers, each connected to a plurality of solar modules, a plurality of DC breakers that block the connection between each solar module and a grid-connected inverter, and connected to a plurality of DC breakers. , a current-voltage measurement module that measures the current and voltage of each solar module connected to each DC breaker, and controls the operation of each DC breaker based on the current and voltage of each solar module measured by the current-voltage measurement module. It includes a control module that determines that a problem has occurred within the solar module and solar power generation control panel based on the current and voltage of each solar module measured by the current and voltage measurement module, and when a problem occurs, the solar module The connection between the system and the grid-connected inverter can be blocked.

Description

Solar power control panel with a plurality of DC breaker {Solar power control panel with a plurality of DC breaker}

It relates to a solar power generation control panel, and more specifically, to a solar power generation control panel having a plurality of DC circuit breakers.

In general, Automatic Generation Control (AGC) refers to automatically controlling the generator output according to changes in demand in the power system. The reason why such automatic generation control is essential in the power system is because of the required strategic quantity. This is to prevent loss of power generation costs due to excessive power generation in advance by adjusting the power generation amount of each generator accordingly.

This automatic power generation control device is connected to a plurality of solar modules, receives power generated from the plurality of solar modules, consumes the generated power through the connected load, and redirects the remaining power that is not consumed by the load to the KEPCO system. Inflow.

The solar power generation control panel is a distribution board for controlling a plurality of connected solar power modules, and inputs current, voltage, etc. from the plurality of solar power modules. As the number of solar power modules connected to the solar power generation control panel increases, the amount of power passing through the solar power generation control panel also increases.

Here, when the solar power generation control panel is generating maximum power from all connected solar power modules, the voltage and current flowing into the solar power generation control panel reach the maximum, and the temperature inside the solar power generation control panel increases. When the temperature inside the solar power generation control panel rises, internal facilities may deteriorate or break down due to the high heat. Furthermore, there was a problem that a fire could occur.

Republic of Korea Patent Publication No. 10-1012348

The object is to provide a solar power generation control panel having a plurality of DC circuit breakers. In addition, the present invention is not limited to the technical challenges described above, and other technical challenges may be derived from the following description.

A solar power generation control panel having a plurality of DC breakers according to an embodiment of the present invention includes a plurality of DC breakers each connected to a plurality of solar modules and blocking the connection between each solar module and a grid-connected inverter; A current-voltage measurement module connected to the plurality of DC circuit breakers and measuring the current and voltage of each solar module connected to each DC circuit breaker; And a control module that controls the operation of each DC breaker based on the current and voltage of each solar module measured by the current-voltage measurement module, wherein the control module controls each solar power measured by the current-voltage measurement module. The DC breaker connected to the solar module whose current and voltage exceed both the preset maximum allowable voltage and maximum allowable current is activated, thereby blocking the connection between the solar module and the grid-tied inverter.

A solar power generation control panel having a plurality of DC circuit breakers according to an embodiment of the present invention includes an exhaust fan that exhausts air inside the solar power generation control panel to the outside; an air supply fan that introduces air from outside the solar power generation control panel into the solar power generation control panel; and a temperature sensor that measures the internal temperature of the solar power generation control panel, wherein the control module controls operations of the exhaust fan and the air supply fan based on the internal temperature measured by the temperature sensor.

The control module determines the operating state of each solar module based on the voltage and current of each solar module measured by the current-voltage measurement module, and determines the voltage and current of each solar module at a preset maximum allowable voltage, Compare with the minimum allowable voltage, maximum allowable current and minimum allowable current, the voltage of each solar module exceeds the maximum allowable voltage or is less than the minimum allowable voltage, and the current of each solar module exceeds the maximum allowable current or the minimum allowable current If there is a solar module that is less than 100%, the state of the solar module is determined to be in a caution operation state. Otherwise, it is determined to be in a normal state, and if at least one of the plurality of solar modules is determined to be in a caution operation state, the state of the solar module is determined to be in a caution operation state. A solar module whose current and voltage exceed the maximum allowable current and maximum allowable voltage, respectively, is determined to be a fire hazard type indicating that there is a fire risk inside the solar power generation control panel, and the solar module determined to be in a caution operating state is determined to be a fire hazard type. Photovoltaic modules whose current and voltage are less than the minimum allowable current and minimum allowable voltage, respectively, are determined as individual module failure types.

When the solar module determined to be in the caution operation state is determined to be an individual module failure type, the control module determines the current power of the solar module determined to be the individual module failure type and other solar modules adjacent to the solar module determined to be the individual module failure type. The average current power of the optical module is compared, and as a result of the comparison, if the ratio between the current power of the solar module determined as the individual module failure type and the average current power of the other adjacent solar modules is less than a preset threshold power ratio, the individual If the solar module determined by the module failure type is determined to be faulty, otherwise it is determined to be normal, and if the solar module determined by the individual module failure type is determined to be faulty, turn off the DC breaker connected to the solar module determined to be faulty. By operating it, the connection between the solar module determined to be faulty and the grid-connected inverter is blocked.

The critical power ratio is proportional to the area of the solar module.

According to the above-described embodiments of the present invention, the solar power generation control panel uses a DC breaker connected to each solar power module when an abnormality occurs in any one of the solar power modules connected to the solar power generation control panel. By physically blocking the connection between the solar module and the grid-connected inverter, problems can be prevented from occurring in other solar modules.

In addition, the solar power generation control panel according to embodiments of the present invention operates the air supply fan and exhaust fan to rapidly lower the internal temperature when the temperature inside the solar power generation control panel rises, thereby causing the components inside the solar power generation control panel to be damaged. It can prevent damage from heat or fire from overheating.

In addition, the solar power generation control panel according to embodiments of the present invention detects a failed solar power generation module among a plurality of connected solar power modules and notifies the manager that a failure has occurred in the solar power module, thereby Enables quick response to power generation modules.

Figure 1 is a block diagram showing the configuration of a solar power generation control panel having a plurality of DC circuit breakers according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram illustrating the configuration of the solar power generation control panel shown in FIG. 1.
Figure 3 is a flowchart of a temperature control method using a control module in a solar power generation control panel.
Figure 4 is a diagram showing the DC circuit breaker shown in Figures 1 and 2.

The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the technical idea of the present disclosure is not limited to the following embodiments and may be implemented in various different forms. The following embodiments are merely intended to complete the technical idea of the present disclosure and to be used in the technical field to which the present disclosure belongs. It is provided to fully inform those skilled in the art of the scope of the present disclosure, and the technical idea of the present disclosure is only defined by the scope of the claims.

When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description will be omitted.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which this disclosure pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined. The terminology used herein is for the purpose of describing embodiments and is not intended to limit the disclosure. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context.

Additionally, in describing the components of the present disclosure, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It will be understood that elements may be “connected,” “combined,” or “connected.”

As used in this disclosure, “comprises” and/or “comprising” refers to a referenced component, step, operation and/or element that includes one or more other components, steps, operations and/or elements. Does not exclude presence or addition.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Electrical equipment refers to electrical equipment that houses electrical devices such as breakers, switches, and various instruments that require distribution of electricity and control of the distribution system, and includes switchboards, energy storage devices, uninterruptible power supplies, fuel cells, inverters, and connection panels. It can be included.

Hereinafter, embodiments of the present invention will be described in detail along with drawings of the present invention.

Figure 1 is a block diagram showing the configuration of a solar power generation control panel having a plurality of DC circuit breakers according to an embodiment of the present invention. FIG. 2 is an exemplary diagram showing the configuration of the solar power generation control panel shown in FIG. 1. Figure 2 is a schematic diagram of the components of the solar power generation control panel 1. Referring to Figures 1 and 2, the solar power generation control panel 1 having a plurality of DC circuit breakers according to the present embodiments includes a plurality of DC circuit breakers 11, a current and voltage measurement module 12, an exhaust fan 13, Includes an air supply fan (14), a temperature sensor (15), and a control module (16).

Each of the plurality of DC circuit breakers 11 corresponds to a plurality of solar modules 10 connected to the solar power generation control panel 1, and supplies electrical energy produced by each solar module 10 to a grid-connected inverter. The DC circuit breaker 11 blocks power supplied from the solar module 10 to the grid-connected inverter based on a signal input from the control module 16. The operation of the DC breaker 11 will be described in detail below.

The current-voltage measurement module 12 is connected to a plurality of DC circuit breakers 11 and measures the current and voltage produced by the solar module 10 connected to each DC circuit breaker 11. The current and voltage measurement module 12 inputs the measured current and voltage of the solar module 10 to the control module 16.

The exhaust fan 13 is a fan that exhausts the air inside the solar power generation control panel 1 to the outside. The exhaust fan 13 operates according to signals input from the control module 16.

The air supply fan 14 is a fan that introduces air from outside the solar power generation control panel (1) into the solar power generation control panel (1). The air supply fan 14 operates according to signals input from the control module 16.

The exhaust fan 13 exhausts hot air inside the solar power generation control panel 1 to the outside, and the air supply fan 14 exhausts cold air outside the solar power generation control panel 1 to the outside. The operations of the exhaust fan 13 and the air supply fan 14 will be described in detail below.

The temperature sensor 15 measures the temperature inside the solar power generation control panel 1. The temperature sensor 15 inputs the measured temperature to the control module 16. The solar power generation control panel 1 according to embodiments of the present invention includes a plurality of temperature sensors 15. A plurality of temperature sensors 15 are installed at positions corresponding to each other inside the solar power generation control panel 1. For example, when two temperature sensors 15 are installed, one of the two is installed on the front and rear of the solar power generation control panel 1, or on the top and bottom.

The control module 16 controls the operation of the DC circuit breaker 11, the exhaust fan 13, and the air supply fan 14. The control module 16 controls the operation of the DC breaker 11 based on the current and voltage of each solar module 10 measured by the current-voltage measurement module 12. For example, if both the voltage and current of each solar module 10 exceed the preset maximum allowable voltage and maximum allowable current, or are below the minimum allowable voltage and minimum allowable current, the DC breaker 11 is operated to generate solar energy. Block the connection between the module (10) and the grid-connected inverter.

In addition, the control module 16 operates the exhaust fan 13 and Controls the operation of the air supply fan (14). The control module 16 can prevent the temperature inside the solar power generation control panel 1 from increasing by controlling the operation of the exhaust fan 13 and the air supply fan 14. The specific operation of the control module 16 that controls the DC circuit breaker 11, the exhaust fan 13, and the air supply fan 14 will be described in detail below.

Figure 3 is a flowchart of a temperature control method using a control module in a solar power generation control panel. Referring to FIG. 3, in step 301, the current and voltage measurement module 12 of the solar power generation control panel 1 measures the current and voltage input to the solar power generation control panel 1 from each of the plurality of solar modules 10. Measure. The current-voltage measurement module 12 measures the current and voltage input from the solar module 10 to the DC breaker 11. The current and voltage measurement module 12 inputs the measured current and voltage of each solar module 10 to the control module 16.

In step 302, the control module 16 of the solar power generation control panel 1 determines the operating state of each solar power module 10 based on the input current and voltage of each solar power module 10. More specifically, the control module 16 compares the input current and voltage of each solar module 10 with the maximum allowable voltage, minimum allowable voltage, maximum allowable current, and minimum allowable current associated with each solar module 10. Thus, the operating state of each solar module 10 is determined. The control module 16 controls the input solar module 10 when the voltage of the input solar module 10 exceeds the maximum allowable voltage or when the voltage of the input solar module 10 is less than the minimum allowable voltage. If the current exceeds the maximum allowable current or if the input current of the solar module 10 is less than the minimum allowable current, the state of the solar module 10 is determined to be a caution operation state. The control module 16 otherwise determines that the state of the solar module 10 is in a normal operating state.

Here, the maximum allowable voltage and maximum allowable current mean the maximum voltage and maximum current at which the solar module 10 can stably produce power, and the minimum allowable voltage and minimum allowable current mean the solar module 10 can stably produce power. This refers to the minimum voltage and minimum current that can produce power. The solar module 10 operates stably within the minimum allowable voltage or lower than the maximum allowable voltage and within the minimum allowable current or maximum allowable current. If the voltage of the output of the solar module (10) exceeds the maximum allowable voltage and maximum allowable current or is less than the minimum allowable voltage and minimum allowable current, the power production efficiency of the solar module (10) is low, or the solar module (10) has low power production efficiency. The probability of failure increases. In particular, if the solar module 10 continues to operate with a voltage and current exceeding the maximum allowable voltage and maximum allowable current, there is a risk of fire occurring due to overheating of the solar module 10.

The solar power generation control panel 1 according to embodiments of the present invention calculates the maximum allowable voltage, minimum allowable voltage, maximum allowable current, and minimum allowable current in order to ensure that the solar module 10 operates safely and continuously. The control module 16 of the solar power generation control panel 1 calculates the maximum allowable voltage, minimum allowable voltage, maximum allowable current, and minimum allowable current based on the maximum design voltage of each solar module 10.

For example, the control module 16 may set the maximum allowable voltage to 80% of the maximum design voltage, and the minimum allowable voltage to 20% of the maximum design voltage. The maximum allowable current can be set to 80% of the maximum design current, and the minimum allowable current can be set to 20% of the maximum design current.

In step 303, when it is determined that at least one of the plurality of photovoltaic modules 10 is in the caution operation state, the control module 16 of the solar power generation control panel 1 controls the current of the solar module 10 determined to be in the caution operation state. And based on the voltage, an expected failure type of the solar module 10 determined to be in a caution operating state is determined. More specifically, the control module 16 poses a risk of fire inside the solar power generation control panel 1 if each of the current and voltage of the solar module 10 determined to be in a caution operating state exceeds the maximum allowable current and maximum allowable voltage. Decide by type. The control module 16 is an individual module that indicates that the solar module 10 determined to be in a caution operating state is malfunctioned when the current and voltage of the solar module 10 determined to be in a caution operating state are less than the minimum allowable current and minimum allowable voltage, respectively. Determined by failure type.

In step 304, when the expected failure type of the photovoltaic module 10 determined as the caution operation state is determined to be a fire risk type, the temperature sensor 15 of the solar power generation control panel 1 is inside the solar power generation control panel 1. Measure the temperature. The temperature sensor 15 inputs the internal temperature measured in the solar power generation control panel 1 before operation of the exhaust fan 13 to the control module 16.

In step 305, the control module 16 of the solar power generation control panel 1 operates the exhaust fan 13 based on the measured internal temperature. The control module 16 compares the measured internal temperature with a preset critical temperature, and operates the exhaust fan 13 when the measured internal temperature is higher than the critical temperature as a result of the comparison. Here, the critical temperature is a boundary temperature that may cause failure of components inside the solar power generation control panel 1 if the critical temperature continues for a certain period of time or more, and is preset by the user. For example, the user can preset the critical temperature to 70°C.

In step 306, the temperature sensor 15 of the solar power generation control panel 1 operates the exhaust fan 13 and measures the temperature inside the solar power generation control panel 1 after a standard operating time. The temperature sensor 15 inputs the internal temperature measured in the solar power generation control panel 1 to the control module 16 after the operation of the exhaust fan 13.

In step 307, the control module 16 of the solar power generation control panel 1 operates the air supply fan 14 based on the internal temperature measured in step 306. The control module 16 compares the internal temperature before operating the exhaust fan 13 with the internal temperature measured after the standard operating time after operating the exhaust fan 13, and measuring after the standard operating time after operating the exhaust fan 13. If the internal temperature is higher than the internal temperature before operation of the exhaust fan (13), the air supply fan (14) is operated.

In step 308, the control module 16 of the solar power generation control panel 1 operates the exhaust fan 13 and, if the internal temperature measured after the standard operating time is higher than the internal temperature before the exhaust fan 13 operates, solar power generation is performed. Operate all DC circuit breakers (11) in the control panel (1) to block the power supplied from all solar modules (10) to the grid-connected inverter. More specifically, the control module 16 operates the motor 114 in the DC breaker 11 to open the wire connecting the solar module 10 and the grid-connected inverter to physically block it.

In this regard, Figure 4 is a diagram illustrating the DC circuit breaker shown in Figures 1 and 2. More specifically, Figure 4 (a) is a diagram showing a state in which the connection line 113 of the DC breaker 11 is connected, and Figure 4 (b) shows the connection line 113 when the DC breaker 11 operates. This is a drawing showing the open state. Referring to FIG. 4, the DC breaker 11 has an input terminal 111 connected to the solar module 10, an output terminal 112 connected to a grid-connected inverter, an input terminal 111, and an output terminal 112. It includes a connection line 113 that connects them and a motor 114 that opens or connects the connection line 113. The control module 16 operates the motor 114 to open the connection line 113 or close the connection line 113 to connect the output terminal 112 and the input terminal 111.

In step 309, if the expected failure type of the photovoltaic module 10 determined as the caution operation state is determined to be an individual module failure type, the control module 16 of the solar power generation control panel 1 is determined to be an individual module failure type. Determine whether the module 10 is broken. More specifically, the control module 16 determines the current voltage and current between the solar module 10 determined by the individual module failure type and other solar modules 10 around the solar module 10 determined by the individual module failure type. Compare the current to determine whether there is a failure.

More specifically, the control module 16 controls the current power produced by the solar module 10 determined by the individual module failure type and the other solar modules 10 adjacent to the solar module 10 determined by the individual module failure type. Compare the average current power produced by The current power is the product of the measured current voltage and current current, and the average current power of other adjacent solar modules 10 is the average current power of the solar module 10 and the other adjacent solar modules 10 determined by the individual module failure type. If there is a plurality, it is the average value of the current power of all other adjacent solar modules 10.

As a result of the comparison, the control module 16 determines that the ratio of the current power produced by the solar module 10 determined by the individual module failure type to the average current power produced by other adjacent solar modules 10 is less than the threshold power ratio. In this case, it is determined that the photovoltaic module 10 determined by the individual module failure type is failed, and if not, it is determined that it is normal.

Here, the critical power ratio is a boundary ratio that determines failure between the current power produced by the solar module 10, determined by the individual module failure type, and the average current power produced by other adjacent solar modules 10. . For example, if the critical power ratio is 50%, the current power produced by solar module 10, as determined by the individual module failure mode, is 180 W, and the average current power of other adjacent solar modules 10 is 300 W. In this case, the ratio of the current power produced by the solar module 10 determined by the individual module failure type to the average current power of other adjacent solar modules 10 is Therefore, since it is above the critical power ratio, the control module 16 determines that the solar module 10 determined by the individual module failure type is normal.

Conversely, if the critical power ratio is 50%, the current power produced by the solar module 10, as determined by the individual module failure type, is 120 W, and the average current power of other adjacent solar modules 10 is 300 W, The ratio of the current power produced by a solar module 10, determined by the individual module failure type, to the average current power of other adjacent solar modules 10 is Therefore, since it is less than the threshold power ratio, the control module 16 determines that the solar module 10 determined by the individual module failure type is faulty.

The threshold power ratio may be preset by the user and may be set to be proportional to the area of the solar module 10.

In the case of solar power generation, the power produced varies depending on the amount of sunlight irradiated to the solar module, and the amount of sunlight irradiated to the solar module varies depending on various factors such as time, solar module installation angle, and location. In particular, even for solar modules installed in adjacent areas, the amount of sunlight irradiated may vary due to obstacles that block sunlight, such as clouds.

The control module 16 according to embodiments of the present invention compares the current power produced by the adjacent solar module 10 with the power produced by the adjacent solar module 10 when an individual module failure type is determined. The failure of the solar module 10 determined by the individual module failure type is determined. If a specific solar module 10 produces significantly lower power compared to adjacent solar modules 10, there is a high possibility that the individual module is broken. On the other hand, if the difference in power production of a particular solar module 10 is not large compared to that of an adjacent solar module 10, it is highly likely due to a difference in the amount of irradiated sunlight. Accordingly, if the current power produced by the solar module 10, which is determined as an individual module failure type based on the critical power ratio, is less than the critical power ratio compared to the average current power of the adjacent solar module 10, the solar module 10 ) is determined to be malfunctioning, and if it is above the critical power ratio, it is determined to be normal.

The critical power ratio is a ratio that serves as a standard for determining whether the solar module 10 is broken. As previously described, the critical power ratio is proportional to the area of the solar module 10. The larger the area of the solar module 10, the higher the critical power ratio, and the narrower the area of the solar module 10, the lower the critical power ratio. For example, if the area of the solar module 10 is 1.64 m2, the critical power ratio can be set to 50%, and if the area of the solar module 10 is 1.8 m2, the critical power ratio can be set to 60%. there is.

The larger the area of the individual solar module 10, the smaller the difference in sunlight irradiation caused by obstacles such as clouds that block sunlight, so the critical power ratio is set higher than that of the solar module 10 with a small area.

In step 310, when the control module 16 of the solar power generation control panel 1 determines that the solar power module 10 is faulty, it operates the DC breaker 11 connected to the solar power module 10 determined to be faulty, The connection between the solar module 10 determined to be faulty and the grid-connected inverter is blocked.

In step 311, when it is determined that the solar power module 10 is broken, the solar power generation control panel 1 sends a failure notification signal indicating that the solar power module 10 is broken to the manager terminal of the solar power generation control panel 1 ( (not shown).

According to the above-described embodiments of the present invention, the solar power generation control panel uses a DC breaker connected to each solar power module when an abnormality occurs in any one of the solar power modules connected to the solar power generation control panel. By physically blocking the connection between the solar module and the grid-connected inverter, problems can be prevented from occurring in other solar modules.

In addition, the solar power generation control panel according to embodiments of the present invention operates the air supply fan and exhaust fan to rapidly lower the internal temperature when the temperature inside the solar power generation control panel rises, thereby causing the components inside the solar power generation control panel to be damaged. It can prevent damage from heat or fire from overheating.

In addition, the solar power generation control panel according to embodiments of the present invention detects a failed solar power generation module among a plurality of connected solar power modules and notifies the manager that a failure has occurred in the solar power module, thereby Enables quick response to power generation modules.

So far, the present invention has been looked at with a focus on preferred embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

1: Solar power control panel
11: DC breaker
12: Current voltage measurement module
13: exhaust fan
14: Air supply fan
15: Temperature sensor
16: Control module
10: Solar module

Claims (5)

In the solar power generation control panel having a plurality of DC breakers,
A plurality of DC circuit breakers each connected to a plurality of solar modules and blocking the connection between each solar module and the grid-connected inverter;
A current-voltage measurement module connected to the plurality of DC circuit breakers and measuring the current and voltage of each solar module connected to each DC circuit breaker;
A control module that controls the operation of each DC breaker based on the current and voltage of each solar module measured by the current-voltage measurement module; and
an exhaust fan that exhausts air inside the solar power generation control panel to the outside;
an air supply fan that introduces air from outside the solar power generation control panel into the solar power generation control panel; and
It includes a temperature sensor that measures the internal temperature of the solar power generation control panel,
The control module operates the DC breaker connected to the solar module where the current and voltage of each solar module measured by the current-voltage measurement module exceed both the preset maximum allowable voltage and maximum allowable current, thereby operating the DC breaker connected to the solar module and the system. Block the connection between linked inverters,
The control module controls the operation of the exhaust fan and the air supply fan based on the internal temperature measured by the temperature sensor,
The control module is
Based on the voltage and current of each solar module measured by the current-voltage measurement module, determine the operating state of each solar module,
The voltage and current of each solar module are compared with the preset maximum allowable voltage, minimum allowable voltage, maximum allowable current, and minimum allowable current,
If the voltage of each solar module exceeds the maximum allowable voltage or is less than the minimum allowable voltage, and there are solar modules whose current exceeds the maximum allowable current or is less than the minimum allowable current, the status of the solar module is changed. Determine that it is a caution operation state, otherwise determine it as a normal state,
When at least one of the plurality of solar modules is determined to be in a caution operating state, the solar module whose current and voltage each exceed the maximum allowable current and maximum allowable voltage of the solar module determined to be in the caution operating state is connected to the solar power generation control panel. It is determined as a fire risk type that there is an internal fire risk, and solar modules whose current and voltage, respectively, are less than the minimum allowable current and minimum allowable voltage, which are determined to be in a caution operating state, are determined as individual module failure types.
If the solar module determined to be in the caution operating state is determined to be a fire hazard type, the control module
When the first internal temperature of the solar power generation control panel is above a preset critical temperature, operating the exhaust fan,
When the exhaust fan is operated and the second internal temperature of the solar power generation control panel measured after the standard automatic time is greater than the first internal temperature, the air supply fan is operated and all DC circuit breakers are operated to connect the solar module and the grid-connected inverter. blocking the connection between
If the photovoltaic module determined to be in the caution operation state is determined to be an individual module failure type, the control module
Compare the current power of the solar module determined by the individual module failure type with the average current power of other solar modules adjacent to the solar module determined by the individual module failure type,
As a result of the comparison, if the ratio between the current power of the solar module determined by the individual module failure type and the average current power of other adjacent solar modules is less than a preset threshold power ratio, the solar module determined by the individual module failure type fails. Decide that it is, and if not, determine that it is normal,
When the solar module determined by the individual module failure type is determined to be faulty, the DC breaker connected to the solar module determined to be faulty is operated to block the connection between the solar module determined to be faulty and the grid-connected inverter. Solar power generation control panel. delete delete delete According to claim 1,
A solar power generation control panel, characterized in that the critical power ratio is proportional to the area of the solar module.