KR102320391B1 - connection board apparatus for solar energy generation - Google Patents

Abstract

Provided is a connection board device for solar power generation in accordance with an embodiment of the present invention, comprising: a plurality of fuse parts connected to an output terminal of a plurality of solar cell module arrays; and a fuse status detection and control part for detecting and controlling the status of a plurality of fuse parts. The fuse status detection and control part may include: an electric current detection part for detecting the electric current signal of the output terminal of each of the plurality of solar cell module arrays; and an analog-to-digital converter (ADC) for converting the electric current signal of each output terminal into a digital signal; a micro control unit (MCU) for monitoring the digital signal and determining whether to control the fuse parts depending on the size of the digital signal; and a fuse opening and closing drive part for controlling the opening and closing of the fuse parts. Therefore, the cutting of a fuse can be detected, and a circuit can be controlled to be connected to an auxiliary fuse.

Description

Connection board apparatus for solar energy generation

The present invention relates to a junction panel device for photovoltaic power generation, and more particularly, to a controllable junction panel device for photovoltaic power generation.

2. Description of the Related Art In general, photovoltaic power generation is to generate power using sunlight, and generates power using a solar cell module in which a plurality of solar cells are arranged on a plane.

An apparatus or system for such photovoltaic power generation is largely composed of a plurality of solar cell modules, a connection panel connected to collect DC power generated from the solar cell module for each array, and a method for converting the DC power collected in the connection panel into AC power. It consists of an inverter and the like. Patent Registration No. 1894239 discloses a solar power generation system.

On the other hand, the connection panel for photovoltaic power generation includes a fuse at the input portion from the solar cell module, and when the flowing current exceeds the allowable value, it becomes disconnected, providing means such as protection of the inverter connected to the rear end, fire prevention, etc. are doing However, when the fuse is blown, electricity generated by the solar cell module of the corresponding channel cannot be input to the inverter side, so there is inevitably a setback in electricity production. The blown fuse must be replaced by maintenance and repair personnel, but the solar power generation system is mainly installed in fields, farms, and forests outside of urban areas, so access to visits is low, so the productivity of the solar power generation system will be reduced for a while. can only fall

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and to provide a solar power junction device for detecting a break in a fuse and controlling a circuit to be connected to an auxiliary fuse.

In the connection panel device for photovoltaic power generation according to an embodiment of the present invention, the device includes: a plurality of fuse units connected to output terminals of a plurality of solar cell module arrays; and a fuse state detection and control unit for detecting and controlling states of the plurality of fuse units, wherein the fuse state detection and control unit includes: a current detection unit for detecting a current signal of an output terminal of each of the plurality of solar cell module arrays; ADC (analog to digital converter) unit for converting the current signal of each output terminal into a digital signal; a micro control unit (MCU) unit for monitoring the digital signal and determining whether to control the fuse unit according to the size of the digital signal; and a fuse opening/closing driving unit for controlling opening and closing of the fuse unit, wherein each of the plurality of fuse units includes a basic fuse module including a basic fuse connected to each of the output terminals, and a basic fuse module connected in parallel with the basic fuse module It may include an auxiliary fuse module including an auxiliary fuse and a connection relay.

Additionally or alternatively, the MCU unit applies a low-pass filter having a predetermined cut-off frequency to the digital signal, and periodically determines whether the magnitude of the signal passing the low-pass filter is equal to or less than a first threshold value and it may be determined to control the auxiliary fuse module of the output terminal in which the magnitude of the signal passing through the low-pass filter is determined to be less than or equal to a first threshold value over two consecutive periods.

Additionally or alternatively, in determining to control the auxiliary fuse module, the MCU unit may refer to the magnitude of a signal passing through a low-pass filter of another output stage.

Additionally or alternatively, the MCU unit may control the fuse opening/closing driving unit to change the connection relay of the auxiliary fuse module to a closed state.

Additionally or alternatively, the MCU unit calculates the amount of power generation of the plurality of solar cell module arrays based on the magnitudes of digital signals of all output terminals monitored during a preset period, and presets a time point with the highest amount of power generation during the period. At a time out of the time range, the fuse opening/closing driving unit may be controlled to change the connection relay of the auxiliary fuse module to a closed state.

Additionally or alternatively, if it is determined to control the auxiliary fuse module, the MCU unit may be configured to transmit a notification message to a management server or a designated terminal through a communication unit.

Additionally or alternatively, the basic fuse module may further include a blocking relay connected in series to the basic fuse.

Additionally or alternatively, the MCU unit applies a bandpass filter having a preset bandpass frequency to the monitored signal, and periodically checks whether the maximum amplitude of the signal passing through the bandpass filter exceeds a second threshold. and it may be determined to control the basic fuse module of the output stage in which it is determined that the maximum magnitude of the signal passing through the bandpass filter is greater than the second threshold value over two consecutive periods.

Additionally or alternatively, the MCU may control the fuse opening/closing driving unit to change the blocking relay of the basic fuse module to an open state.

Additionally or alternatively, when it is determined to control the basic fuse module, the MCU unit may be configured to transmit a notification message to a management server or a designated terminal through a communication unit.

In the method of controlling a junction panel device for photovoltaic power generation according to another embodiment of the present invention, the method is performed by a junction panel device for photovoltaic power generation, wherein the method includes an output terminal of each of a plurality of solar cell module arrays detecting a current signal of converting the current signal of the output terminal into a digital signal; Monitoring the digital signal and according to the size of the digital signal, comprising a basic fuse module including a basic fuse and a cut-off relay connected to the output terminal, and an auxiliary fuse and a connection relay connected in parallel with the basic fuse module determining whether to control the fuse unit including the auxiliary fuse module; and controlling opening and closing of a primary fuse or an auxiliary fuse of the fuse unit when it is determined to control the fuse unit.

The above problem solving methods are only some of the embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected are based on the detailed description of the present invention to be described below by those of ordinary skill in the art can be derived and understood as

The junction panel device for photovoltaic power generation according to the present invention detects the disconnection of the fuse and identifies the disconnected fuse, so that it can be known that the fuse needs to be replaced.

In addition, since the junction panel device for photovoltaic power generation according to the present invention connects the circuit of the junction panel through an auxiliary fuse when the fuse is disconnected, a decrease in power production of photovoltaic power generation can be minimized.

In addition, in the connection board device for photovoltaic power generation according to the present invention, when a circuit is connected with an auxiliary fuse when the fuse is disconnected, an electric shock to the photovoltaic power generation system can be minimized by selecting the time point.

In addition, when an abnormality is detected in the output of the solar cell module array, the solar power connection panel device according to the present invention opens the basic fuse, thereby minimizing the electrical shock to the rest of the solar power generation system connected to the rear end. have.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as a part of the detailed description to help the understanding of the present invention, provide embodiments of the present invention, and together with the detailed description, explain the technical spirit of the present invention.
1 shows a configuration diagram of a photovoltaic system according to the present invention.
2 is a block diagram of a fuse state detection and control unit for controlling the operation of the fuse unit according to the present invention.
3 shows a configuration diagram of a photovoltaic system according to the present invention.
4 shows a configuration diagram of a photovoltaic system according to the present invention.
5 is a flowchart of a method for controlling the operation of a fuse unit according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. The terminology used in this specification is intended to help the understanding of the embodiments, and is not intended to limit the scope of the present invention. Also, singular forms used hereinafter include plural forms unless the phrases clearly indicate the opposite.

1 shows a structural diagram of a photovoltaic system 1 according to an embodiment of the present invention. The configuration shown in FIG. 1 does not show all of the entire configuration of a solar power generation system that generates power through sunlight, but only shows a configuration directly related to the present invention for simplicity of explanation.

The photovoltaic power generation system 1 according to the present invention includes a plurality of solar cell module arrays 10 , a plurality of fuse units 20 , a fuse state detection and control unit 30 , an overcurrent breaker 40 , and an inverter 50 . may include Here, the plurality of fuse units 20 and the fuse state detection and control unit 30 may constitute the solar power generation connecting panel device 200 .

The fuse unit 20 may be connected to an output terminal of the plurality of solar cell module arrays 10 . The fuse unit 20 is disposed one at each output terminal of the plurality of solar cell module arrays 10 , and includes a basic fuse 21 , an auxiliary fuse 22 connected in parallel with the basic fuse 21 , and a connection relay 23 . (or a switch). The auxiliary fuse 22 and the connection relay 23 may constitute an auxiliary fuse module.

As shown, the auxiliary fuse 22 and the connection relay 23 are connected in series with each other, and these and the basic fuse 21 are connected in parallel. In the initial and normal state, since the connection relay 23 is open, the current output from the solar cell module array 10 may flow to the overcurrent circuit breaker 40 and the inverter 50 through the basic fuse 21. . If disconnection of the basic fuse 21 is detected, the connection relay 23 is controlled to close, and the current output from the solar cell module array 10 is transmitted through the auxiliary fuse 22 and the connection relay 23 through the overcurrent breaker ( 40) and the inverter 50 side. As such, the connection panel device 200 for photovoltaic power generation according to the present application detects the disconnection of the primary fuse and operates the auxiliary fuse, thereby continuously delivering the generated power of the solar cell module array 10 to the inverter side. , productivity and efficiency are secured, and it can provide advantages to operators or operators in terms of maintenance as well.

The illustrated interconnection state of the configuration of the fuse unit 20 is exemplary, and the connection relay 23 may be connected to be cross-connected with the primary fuse 21 or the auxiliary fuse 22 .

That is, in the initial and normal state, the connection relay 23 is connected in series with the basic fuse 21 to flow a current to the overcurrent circuit breaker 40 and the inverter 50 side, and when the disconnection of the basic fuse 21 is detected The connection relay 23 is connected to the auxiliary fuse 22 , and the current output from the solar cell module array 10 is transferred to the overcurrent breaker 40 and the inverter 50 through the auxiliary fuse 22 and the connection relay 23 . ) can flow sideways.

The overcurrent circuit breaker 40 blocks the current flow when the current flowing to the inverter 50 exceeds a preset size.

The inverter 50 converts the output of the solar cell module array 10 , that is, the generated DC power into AC power. 1 is a central type inverter.

Hereinafter, the fuse state detection and control unit 30 for detecting the disconnection of the basic fuse 21 and controlling the connection relay 23 will be described.

2 shows a block diagram of the fuse state detection and control unit 30 . The fuse state detection and control unit 30 may monitor the current of the output terminal of the solar cell module array 10 . The fuse state detection and control unit 30 includes a current detection unit 31 , an analog to digital converter (ADC) unit 32 , a micro control unit (MCU) unit 33 , a fuse opening/closing driving unit 34 , and a storage unit 35 . , a power supply unit 36 and a communication unit 37 may be included.

The current detector 31 may detect a current signal of each output terminal of the solar cell module array 10 . The current detector 31 may be implemented as a through-type Hall sensor, and may detect a current flow in each line.

Then, the ADC unit 32 may convert the analog current signal detected by the current detection unit 11 to a digital signal by sampling at a preset sampling rate. Since the digitally converted signal is used to measure the amount of generated power or peak current (change amount), which will be described later, it is sampled at a sampling rate of 5000 Hz, which is 10 times the 500 Hz (Hz) defined as the lowest AC component frequency.

The MCU unit 33 may receive a digital signal that is an output of the ADC unit 32 and monitor it. The MCU unit 33 may determine whether to control the fuse unit 20 according to the size of the monitored digital signal. As described above, when it is determined that the level of the digital signal of an output terminal is relatively small (or a magnitude close to zero), it is estimated (or determined) that a disconnection has occurred in the corresponding output terminal, and the fuse unit 20, more specifically, the fuse It may be determined to control the connection relay 23 of the unit 20 .

A detailed method for the MCU unit 33 to detect the level of the digital signal to determine the control of the fuse unit 20 will be described.

A low pass filter (LPF) may be used to monitor only the direct current (DC) component of the digital signal, which is the output of the ADC unit 32 . In the LPF, a preset cut-off frequency may be set to pass only a frequency band less than or equal to a preset cut-off frequency (eg, 10 Hz). Since most of the frequency bands exceeding the preset cut-off frequency are removed from the digital signal passing through the LPF, the MCU unit 33 controls the DC component of the digital current signal and its size (hereinafter referred to as “digital signal size”). can be detected.

The MCU unit 33 may periodically determine whether the level of the digital signal passing through the LPF is equal to or less than a threshold for each output terminal. The magnitude of the digital signal means the amount of current, and thus the amount of power can be calculated. Therefore, the magnitude of the detected digital signal may ultimately indicate the amount of power generation of the solar cell module array 10 .

As one method, when the magnitude of the digital signal to a certain output terminal is less than or equal to a threshold value, the MCU unit 33 may determine that the basic fuse 21 connected to the corresponding output terminal is blown.

As another method , when the level of the digital signal passing through the LPF is detected to be less than or equal to the threshold value over two consecutive cycles, the MCU unit 33 may determine that the basic fuse 21 connected to the corresponding output terminal is blown. .

As another method, when the level of the digital signal that has passed through the LPF for a preset time is detected to be less than or equal to a threshold value, the MCU unit 33 may determine that the basic fuse 21 connected to the corresponding output terminal is blown. Alternatively, when the level of the digital signal passing through the LPF is detected to be less than or equal to the threshold value, the MCU unit 33 decrements the preset counter value (>=1) by 1, and the counter value reaches a specific value (eg, 0). When it arrives, it may be determined that the basic fuse 21 connected to the corresponding output terminal is blown.

When it is determined that the basic fuse 21 connected to the corresponding output terminal is disconnected, the MCU unit 33 may determine to control the auxiliary fuse modules 22 and 23 or the connection relay 23 connected to the corresponding output terminal.

On the other hand, when the MCU unit 33 determines that the basic fuse 21 connected to an output terminal is blown or determines to control the auxiliary fuse modules 22 and 23 or the connection relay 23 connected to an output terminal, the remaining output terminals can refer to the size of the digital signal of This is because, for reasons other than the disconnection of the fuse, for example, when the overall amount of power generation of the solar cell module array 10 is not high due to weather, the magnitude of the digital signal may be less than or equal to the threshold value. In general, as there are more output terminals in which the digital signal size is less than or equal to the threshold value among all output terminals, the amount of power generation may be sluggish due to causes other than disconnection. Therefore, when determining whether the basic fuse 21 is blown, the MCU unit 33 refers to the size of the digital signal of the remaining output terminals, but the number of output terminals having the digital signal size less than or equal to the threshold value, and the digital signals of all output terminals The average value of the size of , etc. can be considered together.

When it is determined that the basic fuse 21 connected to a certain output terminal is disconnected, the MCU unit 33 controls the fuse opening/closing driving unit 34 to change the connection relay 23 connected to the corresponding output terminal to the closed state. can

On the other hand, when the MCU unit 33 controls the connection relay 23 connected to the output terminal to change to the closed state, the amount of power generated by the plurality of solar cell module arrays 10 based on the magnitude of the digital signal of all output terminals can be considered. . When the connection relay 23 or the auxiliary fuse 22 is connected to the circuit at a time when the amount of power generation of the solar cell module array 10 is large, an electric shock may occur to the circuits, elements, etc. included in the solar power generation system 1 . Because. Accordingly, it is possible to control the connection relay 23 to close when a preset condition is satisfied.

Here, the preset condition is a point out of the preset time range centered on a point in time when the power generation amount of the plurality of solar cell module arrays 10 based on the magnitude of digital signals of all output terminals during a preset period (eg, 24 hours) is the highest. It may mean whether or not

Accordingly, the MCU unit 33 controls the fuse opening/closing driving unit 34 to close the connection relay 23 of the auxiliary fuse module at a time point outside the preset time range centered on the highest power generation amount during the preset period. can be changed to

When it is determined that the basic fuse 21 is blown, the MCU unit 33 may generate a notification message and transmit it to the management server, a designated terminal, or a monitoring panel through the communication unit 37 . Through this, the personnel in the monitoring group or the occupant of the designated terminal recognize the disconnection of the basic fuse 21, and later, maintenance personnel, etc. are dispatched to the site to replace the fuse. In addition, the notification message may be a means of notifying the fact that the primary fuse 21 is disconnected or that the auxiliary fuse 22 is connected or the connection relay 23 is connected due to the disconnection of the primary fuse 21 . have.

In addition, the notification message transmitted by the MCU unit 33 includes a disconnected primary fuse 21 (or a connected auxiliary fuse 22/connection relay 23), a primary fuse module including a disconnected primary fuse 21, Auxiliary fuse module with connected auxiliary fuse 22/connection relay 23, output terminal connected to blown primary fuse 21 (or connected auxiliary fuse 22/connection relay 23), or blown primary fuse It may include identification information of the solar cell module array 10 connected to ( 21 ) (or the connected auxiliary fuse 22/connection relay 23 ). Through this, the personnel in the monitoring group or the occupant of a designated terminal can easily identify the disconnected location.

The fuse opening/closing driving unit 34 may control the closing of the fuse unit 20 (the connection relay 23 among them) as described above.

The storage unit 35 may store the operation of each component according to the present invention described above, and may store various information required for each operation.

The power supply unit 36 supplies power to the fuse state detection and control unit 30 , and the communication unit 37 allows data to be transmitted/received to or from an external device, server, or the like.

3 is a block diagram of a photovoltaic power generation system according to another embodiment of the present invention. The configuration shown in FIG. 3 does not show all of the entire configuration of the solar power generation system that generates power through sunlight, but only shows the configuration directly related to the present invention for the sake of simplicity of explanation.

In FIG. 3 , unlike FIG. 1 , a blocking relay 24 (or a switch) is added in series to the basic fuse 21 of each output terminal of the solar cell module array 10 . In FIG. 3 , the basic fuse 21 and the blocking relay 24 may constitute a basic fuse module. In order not to give an electric shock to the circuit or element included in the photovoltaic power generation system 1 when the magnitude of the signal of the output terminal of the solar cell module array 10 exceeds the threshold value, the cutoff relay 24 is the output terminal to open the circuit of

More specifically, a component that gives an electric shock to a circuit or element included in the photovoltaic system 1 in the digital signal may be referred to as noise. Noise may be defined as a high frequency component other than a DC component expected to be output by the solar cell module array 10 . Accordingly, noise may be defined as a component having a frequency of a preset band. However, when the noise is relatively small, the electrical shock will be insignificant, so when the noise has a certain size, the cutoff relay 24 of the corresponding output terminal is controlled. The noise estimated to have an electric shock in the photovoltaic power generation system 1 is briefly referred to as “overcurrent”.

Since the content of the invention related to FIG. 3 other than that is the same as the photovoltaic power generation system of FIG. 1, refer to the description related to FIG. 1, and only the content directly related to the cut-off relay 24 will be described in relation to FIG. .

In order to detect noise, a band pass filter (BPF) may be used to monitor only a frequency component of a predetermined band in the digital signal, which is an output of the ADC unit 32 . The BPF may be set to have a preset bandpass frequency.

The MCU unit 33 may apply a BPF having a preset bandpass frequency to the monitored digital signal, and periodically determine whether the maximum magnitude of the signal passing the bandpass filter exceeds a threshold value.

As one method, when the maximum magnitude of the digital signal for a certain output terminal exceeds a threshold value, the MCU unit 33 may determine that an overcurrent has occurred in the solar cell module array 10 of the corresponding output terminal. Accordingly, the MCU unit 33 may determine to control the basic fuse modules 21 and 24 or the blocking relay 24 connected to the corresponding output terminal.

As another method, when it is detected that the maximum magnitude of the digital signal that has passed through the BPF exceeds the threshold over two consecutive cycles, the MCU unit 33 generates an overcurrent in the solar cell module array 10 of the corresponding output terminal. can be considered to have occurred.

As another method, when it is detected that the maximum magnitude of the digital signal that has passed through the BPF for a preset time exceeds the threshold value, the MCU unit 33 determines that an overcurrent has occurred in the solar cell module array 10 of the corresponding output terminal. can do. Alternatively, if it is detected that the maximum magnitude of the digital signal passing through the BPF exceeds the threshold value, the MCU unit 33 decrements the preset counter value by 1, and when the counter value reaches a specific value (eg, 0), , it can be determined that an overcurrent has occurred in the solar cell module array 10 of the corresponding output terminal.

When determining that an overcurrent has occurred in the solar cell module array 10 of an output terminal, the MCU 33 may determine to control the basic fuse module of the corresponding output terminal. Then, the MCU unit 33 may control the fuse opening/closing driving unit 34 to change the blocking relay 24 of the basic fuse module to an open state.

When it is determined to control the basic fuse module, the MCU unit 33 may generate a notification message and transmit it to the management server, a designated terminal, or a monitoring panel through the communication unit 37 . Through this, the personnel in the monitoring group or the occupant of the designated terminal can recognize the overcurrent state of the output of the solar cell module array 10, and the maintenance personnel, etc. can visit the site later to check the condition. In addition, the notification message may be a means of notifying the fact that the overcurrent has occurred or the basic fuse 21 or the cut-off relay 24 is opened due to the over-output.

In another embodiment, the threshold value, which is compared with the maximum magnitude of the digital signal passing through the BPF, is defined as two values, a case where the first threshold value is exceeded, and a second threshold value (> first threshold value) Cases exceeding this may be handled differently.

When the magnitude of the digital signal for a certain output terminal exceeds the first threshold value but is less than or equal to the second threshold value, the MCU unit 33 may determine that a temporary problem has occurred in the solar cell module array 10 of the corresponding output terminal. In this case, the MCU unit 33 may generate a first notification message and transmit it to a management server, a designated terminal, or a monitoring panel through the communication unit 37 . Through this, the personnel in the monitoring group or the occupant of the designated terminal can recognize a temporary problem, and later, maintenance personnel, etc. are dispatched to the site to inspect the solar cell module array 10 .

In addition, when the magnitude of the digital signal for a certain output terminal exceeds the second threshold, the MCU 33 may determine that a permanent problem has occurred in the solar cell module array 10 of the corresponding output terminal. In this case, the MCU unit 33 may generate a second notification message and transmit it to a management server, a designated terminal, or a monitoring panel through the communication unit 37 . Through this, the personnel in the monitoring group or the occupant of the designated terminal can recognize a permanent problem, and later, maintenance personnel, etc. can come to the site to inspect the solar cell module array 10 .

In addition, the notification message transmitted by the MCU unit 33 is an open basic fuse 21 , a basic fuse module including the opened basic fuse 21 , an output terminal connected to the open basic fuse 21 , or an open basic fuse 21 . It may include identification information of the solar cell module array 10 connected to the fuse 21 . Through this, the personnel in the monitoring group or the occupant of the designated terminal can easily grasp the open position.

Meanwhile, the opened basic fuse 21 or the cut-off relay 24 may be reconnected or operated in a closed state according to a preset condition. Here, the preset condition may be similar to the preset condition when closing the connection relay 23 described above with reference to FIG. 1 . That is, the preset condition may include a point in time when the overall amount of power generation of the photovoltaic system 1 is not relatively high. By reconnecting or closing the basic fuse 21 or the cut-off relay 24 in a state where the amount of power generation is not relatively high, an electric shock to the components and elements included in the photovoltaic power generation system 1 can be minimized.

In addition, in the photovoltaic power generation system 1 of FIG. 3 , when it is determined that the basic fuse 21 connected to any output terminal described with reference to FIG. 1 is disconnected, the MCU unit 33 closes the connection relay 23 . When operating in the state, the cut-off relay 23 can be opened. This is to prevent a situation in which both the primary fuse 21 and the auxiliary fuse 22 are connected to the circuit due to unexpected erroneous detection.

4 shows a configuration diagram of a photovoltaic system 1 according to another embodiment of the present invention. The configuration shown in FIG. 4 does not show all of the overall configuration of the solar power generation system that generates power through sunlight, but only shows the configuration directly related to the present invention for the sake of simplicity of explanation.

Unlike the photovoltaic power generation system shown in FIGS. 1 and 3 , the solar power generation system 1 shown in FIG. 4 does not include a current breaker 40 in the system, and the inverter 50 is a string type. Other than the configuration and operation of the solar cell module array 10, the fuse unit 20, the fuse state detection and the control unit 30 of the photovoltaic power generation system 1 are the same as those of the system shown in FIG. 1, detailed description will refer to FIG. 1 .

In addition, although not shown, in the photovoltaic power generation system 1 shown in FIG. 4 , like the photovoltaic system of FIG. 3 , a blocking relay 24 connected in series to the basic fuse 21 is added to the photovoltaic power generation system Also included in the scope of the present invention, a description thereof will be referred to with reference to FIG.

5 is a flowchart of a method for controlling the operation of a fuse unit according to the present invention. The method shown in FIG. 5 may be performed by the junction panel device 200 for photovoltaic power generation.

The connection panel device 200 for photovoltaic power generation may detect a current signal of an output terminal of each of the plurality of solar cell module arrays 10 ( S510 ).

The connection panel device 200 for photovoltaic power generation may convert the current signal of each output terminal of the plurality of solar cell module arrays 10 into a digital signal (S520).

The connection panel device for photovoltaic power generation 200 monitors a digital signal, and according to the size of the digital signal, a basic fuse module including a basic fuse, which is connected to an output terminal of each of the plurality of solar cell module arrays 10; and whether to control a fuse unit including an auxiliary fuse module connected in parallel with the basic fuse module and an auxiliary fuse module including a connection relay ( S530 ).

When it is determined that the solar power generation connection panel device 200 controls the fuse unit, it may control the opening and closing of the main fuse or the auxiliary fuse of the fuse unit ( S540 ).

The control method related to FIG. 5 may include at least some of the contents related to the present invention described with reference to FIGS. 1 to 4 as a configuration of the method. For a detailed description, refer to the description related to FIGS. 1 to 4 .

In the above specification, "device" or "system" and its components (solar cell module array 10, fuse unit 20, fuse state detection and control unit 30, current detection unit 31, ADC unit 32 ), MCU unit 33, fuse opening/closing driving unit 34, current circuit breaker 40, inverter 50, etc.) have been described as carrying out the invention, but “device” and “system” and components belonging thereto are names. However, the scope of rights is not subordinated to it. That is, the method or procedure of the present invention may be performed with a name other than an apparatus or a system, and the method or method may be implemented by software for controlling the fuse unit, or a code readable by a computer or other machine or apparatus, etc. can be performed.

In addition, as another aspect of the present invention, the above-described proposal or operation of the invention is performed by a "computer" (a comprehensive concept including a system on chip (SoC) or (micro) processor, etc.) Code that can be implemented, implemented, or executed, or a computer-readable storage medium or computer program product storing or including the code, may also be provided, and the scope of the present invention is that the code or the storage or a computer-readable storage medium including a computer program product or a computer program product.

The detailed description of the preferred embodiments of the present invention disclosed as described above is provided to enable any person skilled in the art to make and practice the present invention. Although the above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention described in the claims below. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

1: Solar power system
10: solar cell module array, 20: fuse unit
30: fuse state detection and control unit, 31: current detection unit
32: ADC unit, 33: MCU unit
34: fuse opening/closing driving unit, 40: current breaker
50: inverter 200: connection panel device for solar power generation

Claims (11)

In the connection panel device for photovoltaic power generation,
a plurality of fuse units connected to output terminals of the plurality of solar cell module arrays; and
and a fuse state detection and control unit for detecting and controlling states of the plurality of fuse units,
Each of the plurality of fuse units,
a basic fuse module including a basic fuse connected to each of the output terminals, and an auxiliary fuse module including an auxiliary fuse and a connection relay connected in parallel with the basic fuse module,
The fuse state detection and control unit includes:
a current detection unit for detecting a current signal of an output terminal of each of the plurality of solar cell module arrays;
ADC (analog to digital converter) unit for converting the current signal of each output terminal into a digital signal;
a micro control unit (MCU) unit for monitoring the digital signal and determining whether to control the fuse unit according to the size of the digital signal; and
and a fuse opening/closing driving unit for controlling opening/closing of the fuse unit;
The MCU unit:
When it is determined that the fuse unit is to be controlled, the amount of power generation of the plurality of solar cell module arrays is calculated based on the magnitude of digital signals of all output terminals monitored for a preset period,
In order to prevent an electrical shock to a circuit or element belonging to a photovoltaic power generation system including the photovoltaic junction device, the fuse is outside the preset time range centered on the highest power generation during the cycle. to control the opening/closing driving unit to change the connection relay of the auxiliary fuse module to the closed state,
Junction device for solar power generation. The method of claim 1, wherein the MCU unit comprises:
By applying a low-pass filter having a predetermined cut-off frequency to the digital signal, it is periodically determined whether the magnitude of the signal passing the low-pass filter is equal to or less than a first threshold,
Determining to control the auxiliary fuse module of the output stage, which is determined to be less than or equal to a first threshold value, of a signal that has passed through the low-pass filter over two consecutive periods,
Junction device for solar power generation. The method of claim 2, wherein the MCU unit comprises:
In determining to control the auxiliary fuse module, referring to the magnitude of the signal passing through the low-pass filter of the other output stage,
Junction device for solar power generation. The method of claim 2, wherein the MCU unit comprises:
to control the fuse opening/closing driving unit to change the connection relay of the auxiliary fuse module to a closed state,
Junction device for solar power generation. delete 3. The method of claim 2,
When it is decided to control the auxiliary fuse module,
The MCU unit is configured to transmit a notification message to the management server or a designated terminal through the communication unit,
Junction device for solar power generation. According to claim 1,
The basic fuse module further includes a blocking relay connected in series to the basic fuse,
Junction device for solar power generation. 8. The method of claim 7,
The MCU unit:
By applying a bandpass filter having a preset bandpass frequency to the monitored signal, it is periodically determined whether the maximum magnitude of the signal passing the bandpass filter exceeds a second threshold,
Determining to control the basic fuse module of the output stage where it is determined that the maximum magnitude of the signal passing through the bandpass filter over two consecutive periods exceeds a second threshold value,
Junction device for solar power generation. The method of claim 8, wherein the MCU unit controls the fuse opening/closing driving unit to change the blocking relay of the basic fuse module to an open state.
Junction device for solar power generation. 9. The method of claim 8,
When it is decided to control the basic fuse module,
The MCU unit is configured to transmit a notification message to the management server or a designated terminal through the communication unit,
Junction device for solar power generation. In the control method of a junction panel device for photovoltaic power generation, the method is performed by a junction panel device for photovoltaic power generation,
detecting a current signal of an output terminal of each of the plurality of solar cell module arrays;
converting the current signal of the output terminal into a digital signal;
A basic fuse module including a basic fuse and a cut-off relay that monitors the digital signal and is connected to the output terminal according to the size of the digital signal, and an auxiliary fuse and a connection relay connected in parallel with the basic fuse module determining whether to control the fuse unit including the auxiliary fuse module; and
When it is determined that the fuse unit is to be controlled, controlling the opening and closing of a primary fuse or an auxiliary fuse of the fuse unit;
when it is determined to close the auxiliary fuse, calculating the amount of power generation of the plurality of solar cell module arrays based on the magnitudes of digital signals of all output terminals monitored for a preset period; and
In order to prevent electric shock to a circuit or element belonging to a photovoltaic power generation system including the photovoltaic junction device for photovoltaic power generation, the fuse opens and closes at a time point outside a preset time range centered on the highest power generation amount during the cycle Controlling the driving unit to change the connection relay of the auxiliary fuse module to a closed state,
A control method for a solar power generation junction panel device.

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