JP2017200286A - Photovoltaic power generation system and inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an inspection of a bypass diode provided in a photovoltaic power generation module.SOLUTION: A photovoltaic power generation system 1 including a bypass diode, comprises n string systems 11-1 to 11-n. A string has switches 13-1 to 13-n on a plus terminal side and one of switches 14-1 to 14-n on a minus terminal side. When switching to a bypass diode inspection state from an electric power generation state, an intercept 51 of the pulse terminal side and a pulse contact point 53 are connected to each other in a switch part. On the basis of a state in which an intercept 52 of the minus terminal side and a minus contact point 54 are connected to each other, the intercept 51 of the pulse terminal side and the minus contact point 54 are connected to each other and the intercept 52 of the minus terminal side and a contact point 55 of the plus terminal side are connected to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a photovoltaic power generation system and an inspection method.

Electric power is generated using sunlight by a solar panel. One solar panel is composed of a plurality of cells (photovoltaic power generation cells), for example. Also, for example, a plurality of solar panels are connected in series to form a string. A solar panel may be called a solar cell module (Photovoltaic Module).
In a solar power generation system, a bypass diode may be installed on a solar panel (see Patent Document 1). The bypass diode may be installed, for example, for the purpose of preventing the solar panel from being heated or burned when the solar panel fails. Such a purpose cannot be achieved if the bypass diode is disconnected. For this reason, it is important to inspect the bypass diode for disconnection after the solar panel is installed.

  Here, in the inspection of the bypass diode, for example, a current is passed for each solar panel, and the value of the current is measured. However, in this case, a significant work time is required for removing the solar panel from the solar power generation system, measuring the current flowing through the solar panel, and attaching the solar panel to the original solar power generation system. Sometimes required. In particular, in the mega solar, since there are tens of thousands of solar panels, the work load becomes large.

In addition, as another inspection method, there is also a method of using an infrared camera to inspect whether the bypass diode box (box provided with the bypass diode) installed on the front surface or the back surface of the solar panel is overheated. However, even in this method, a significant amount of time may be required, and furthermore, detection accuracy is generally low.
Moreover, for example, the work of inspecting solar panels installed on the roof for home use or the like using an infrared camera may be complicated.

JP 2014-165277 A

  As described above, in the photovoltaic power generation system, the work or time required for the inspection of the bypass diode provided in the photovoltaic power generation module (for example, a string, a solar panel, or a cell) may be significant. .

  The present invention has been made in view of such circumstances, and provides a photovoltaic power generation system and an inspection method capable of simplifying the inspection of a bypass diode provided in a photovoltaic power generation module.

  One aspect of the present invention is a photovoltaic power generation module having a bypass diode, an inverter that converts a direct current generated by the power generation by the solar power generation module into an alternating current, and outputs the alternating current. The solar power generation module and the inverter It is a photovoltaic power generation system provided with the test | inspection output part which performs the output for flowing the electric current of the same direction as the time of photovoltaic power generation with respect to the said photovoltaic power generation module via the path | route between.

  One aspect of the present invention is the photovoltaic power generation system, wherein the inspection output unit is provided in the inverter and converts an input alternating current into a direct current and outputs the direct current to the photovoltaic power generation module. May be.

  One aspect of the present invention may be configured such that in the photovoltaic power generation system, the inspection output unit includes a pulse generator that generates a voltage or current pulse and outputs the pulse to the photovoltaic power generation module.

  In one embodiment of the present invention, in the solar power generation system, the inspection output unit may include a storage battery that applies a voltage to the solar power generation module.

  One embodiment of the present invention may employ a configuration including a measurement unit that measures a value related to a current flowing through the solar power generation module or a voltage applied to the solar power generation module in the solar power generation system.

  According to one aspect of the present invention, the solar light is generated via a path between an inverter that converts a direct current generated by power generation by a solar power generation module having a bypass diode into an alternating current and outputs the alternating current. Output for flowing current in the same direction as during solar power generation to the power generation module, measure a value related to the current flowing through the solar power generation module or the voltage applied to the solar power generation module, and the result of the measurement Is an inspection method for inspecting the photovoltaic power generation module based on the above.

  According to the solar power generation system and the inspection method described above, the inspection of the bypass diode provided in the solar power generation module can be simplified.

It is a figure which shows the schematic structural example of the solar energy power generation system which concerns on one Embodiment (1st structural example) of this invention. It is a figure for demonstrating the outline | summary of the operation | movement of the string at the time of the photovoltaic power generation concerning one Embodiment of this invention. It is a figure for demonstrating the outline | summary of the operation | movement of a string at the time of the test | inspection of the bypass diode which concerns on one Embodiment of this invention. It is a figure which shows the schematic structural example of the solar energy power generation system which concerns on one Embodiment (2nd structural example) of this invention. It is a figure which shows the schematic structural example of the solar energy power generation system which concerns on one Embodiment (3rd structural example) of this invention. It is a figure which shows the schematic structural example of the solar energy power generation system which concerns on one Embodiment (4th structural example) of this invention. It is a figure which shows the schematic structural example of the solar energy power generation system provided with the measuring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the schematic structural example of the measuring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the schematic structural example of the monitoring system which concerns on one Embodiment of this invention. It is a figure which shows the schematic structural example of the measuring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the schematic structural example of the monitoring apparatus which concerns on one Embodiment of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings.

(First configuration example)
[Configuration example of solar power generation system]
FIG. 1 is a diagram illustrating a schematic configuration example of a photovoltaic power generation system 1 according to an embodiment (first configuration example) of the present invention.
The solar power generation system 1 according to the present embodiment may be applied to, for example, a mega solar system.

The solar power generation system 1 according to the present embodiment includes n (n is an integer of 1 or more) string systems as a solar power generation system. Here, n may be 1, but in the present embodiment, a case where n is 2 or more will be described.
Each string system includes one string (each of n strings 11-1 to 11-n), one connection box (each of n connection boxes 12-1 to 12-n), One switch on the plus (+) terminal side (each of n switches 13-1 to 13-n) and one switch on the minus (−) terminal side (n switches 14-1 to 14-1) 14-n).

In each string system, one string, one junction box, and two switches (a switch on the positive terminal side and a switch on the negative terminal side) are connected in this order. The + terminal is the + terminal of the string, and the − terminal is the − terminal of the string.
Each of the strings 11-1 to 11-n has a predetermined number of solar panels (in each of the strings 11-1 to 11-n, only one solar panel 31-1 to 31-n is assigned a reference numeral. Provided.) The number of solar panels (predetermined number) constituting one string 11-1 to 11-n may be an arbitrary number of 1 or more. In the present embodiment, the case of 2 or more is described. To do.

Moreover, the photovoltaic power generation system 1 according to the present embodiment includes a switch unit 41, an inverter 71, a terminal 72, a transformer 73, a terminal 74, and a terminal 75 as components common to n string systems. , A switch 76, a terminal 77, an ammeter (current detector) 91, and a voltmeter (voltage detector) 92.
The switch unit 41 includes two pieces 51 to 52 and three contacts 53 to 55. The + contact 53 and the + contact 55 are respectively connected to the switches 13-1 to 13-n on the n terminal side of the string system. The negative contact 54 is connected to each of the switches 14-1 to 14-n on the n terminal side of the string system. The intercept 51 on the positive terminal side is connected to the positive terminal of the inverter 71 (via an ammeter 91). The intercept 52 on the terminal side is connected to the minus terminal of the inverter 71.
A voltmeter 92 is connected between the + terminal and the − terminal of the inverter 71.

In the switch unit 41, the positive terminal 53 and the positive contact 53 are connected, and the negative terminal 52 and the negative terminal 54 are connected (hereinafter referred to as “first”). -1 state)), and the positive terminal 54 and the negative contact 54 are connected, and the negative terminal 52 and the positive terminal 55 are connected. (Hereinafter also referred to as “1-2 state”).
Further, the inverter 71, the terminal 72, the transformer 73, the terminal 74, the terminal 75, the switch 76, and the terminal 77 are connected in this order.

In the solar power generation system 1 according to the present embodiment, each string 11-1 to 11-n generates power using sunlight. The generated electric power includes connection boxes 12-1 to 12-n, switches 13-1 to 13-n, 14-1 to 14-n, switch unit 41, inverter 71, terminal 72, transformer 73, terminal 74, and terminal. 75, the switch 76, and the terminal 77 are supplied to the connection destination of the terminal 77. The connection destination of the terminal 77 is, for example, a general power system (hereinafter also referred to as “system”).
Each of the switches 13-1 to 13-n, 14-1 to 14-n, 76 allows electric power to pass when closed (when turned on), and when opened (when turned off). ) Do not pass power.

Here, the transformer 73 changes the magnitude of the AC power voltage. The transformer 73 is provided in, for example, a power conditioner (PCS: Power Conditioning System).
The inverter 71 has a function of performing an operation of converting DC power generated in the n string systems into AC power and outputting it to the transformer 73 side. In the present embodiment, this operation is performed by switching the switch unit 41 to the 1-1 state.
In the present embodiment, the inverter 71 has a function of performing an operation of converting AC power from the transformer 73 side into DC power and outputting it to the n string systems side. In this embodiment, this operation is performed by switching the switch unit 41 to the 1-2 state.
As described above, in the present embodiment, the inverter 71 has a function of bidirectionally converting the AC power on the transformer 73 side and the DC power on the n string system side. Work together.

As an example, the inverter 71 may include a circuit for converting DC power to AC power and a circuit for converting AC power to DC power as separate circuits. As another example, these circuits may be shared. It may be provided as a circuit.
Note that, in a conventional photovoltaic power generation system, generally, an inverter circuit that converts direct current power into alternating current power is used. For example, one or both of hardware and software are additionally provided for the circuit. By providing, you may provide the function to convert from alternating current power to direct current power.

The ammeter 91 is provided between the intercept 51 on the + terminal side and the + terminal of the inverter 71, and measures (detects) the value of the current flowing through the ammeter 91. The ammeter 91 displays the measured value.
The voltmeter 92 is provided between the + terminal and the − terminal of the inverter 71 and measures (detects) the value of the voltage applied between them. The voltmeter 92 displays the measured value.

  Here, in this embodiment, each of the n strings 11-1 to 11-n includes a predetermined number of solar panels, and each solar panel includes a predetermined number of cells. The number of cells (predetermined number) constituting one solar panel may be an arbitrary number of 1 or more. In the present embodiment, a case of 2 or more will be described.

As another configuration example, a solar panel and a cell may be used instead of the string and the solar panel in the present embodiment. That is, one solar panel is used instead of one string (each of the strings 11-1 to 11-n) in the present embodiment, and one solar panel (solar panel 31 in the present embodiment). One cell may be used instead of each of -1 to 31-n.
In one string, a plurality of solar panels may be provided vertically and horizontally, or a plurality of cells may be provided vertically and horizontally in a single solar panel.

[String operation during solar power generation]
FIG. 2 is a diagram for explaining the outline of the operation of the string 11-1 at the time of photovoltaic power generation according to an embodiment of the present invention.
In the present embodiment, the operations of the n strings 11-1 to 11-n are the same. Here, the string 11-1 will be described as an example.
During solar power generation, the switch unit 41 is switched to the 1-1 state.

FIG. 2 shows a schematic configuration example and an operation example during solar power generation for the string 11-1.
The string 11-1 includes a negative terminal 131, a positive terminal 132, and a plurality of solar panels 111-1 to 111-3 (in the example of FIG. 2, three examples are shown). The solar panels 111-1 to 111-3 correspond to the solar panels (solar panels 31-1 and the like) shown in FIG.
Each of the solar panels 111-1 to 111-3 includes m cells (m is an integer of 1 or more) connected in series. Here, m may be 1, but in the present embodiment, a case where m is 2 or more will be described. Specifically, the solar panel 111-1 includes m cells A1-1 to A1-m connected in series, and the solar panel 111-2 includes m cells A2-1 connected in series. The solar panel 111-3 includes m cells A3-1 to A3-m connected in series.

  The plurality of solar panels 111-1 to 111-3 are connected in series. Specifically, the-terminal 131 is connected to the input terminal of the first cell A1-1 of the first solar panel 111-1, and the mth cell of the first solar panel 111-1. The output terminal of A1-m and the input terminal of the first cell A2-1 of the second solar panel 111-2 are connected, and the mth cell A2- of the second solar panel 111-2. The output terminal of m and the input terminal of the first cell A3-1 of the third solar panel 111-3 are connected, and the mth cell A3-m of the third solar panel 111-3 is connected. The output terminal and the + terminal 132 are connected.

  In addition, each of the solar panels 111-1 to 111-3 includes an input terminal of the first cell (respectively, cell A1-1, cell A2-1, cell A3-1) and an mth cell (respectively cell). A bypass diode (bypass diode 151-1, bypass diode 151-2, bypass diode 151-3, respectively) for connecting the output terminals of A1-m, cell A2-m, and cell A3-m) is provided. The respective bypass diodes 151-1 to 151-3 are arranged in the forward direction from the − terminal 131 side toward the + terminal 132 side. Each of the bypass diodes 151-1 to 151-3 has a current when the solar panels 111-1 to 111-3 do not pass current due to a failure or the like (failure or the influence of a shadow of a plant). As a result, the power generation of the entire string 11-1 can be continued.

In addition, in this embodiment, although each solar panel 111-1 to 111-3 shows the case where it has the same number of cells (m sheet in the example of FIG. 2), as another structural example, sunlight The number of cells may be different for each of the panels 111-1 to 111-3.
Moreover, in this embodiment, although the case where each solar panel 111-1 to 111-3 is provided with a bypass diode (each of the bypass diodes 151-1 to 151-3) is shown, as another structural example, arbitrary A bypass diode may be provided to connect both ends of two or more cells connected in series.

At the time of photovoltaic power generation (when the inspection of bypass diodes 151-1 to 151-3 is not performed), when the light 171 from the outside is irradiated onto the string 11-1, the solar panel constituting the string 11-1 Power generation is performed by the cells A1-1 to A1-m, A2-1 to A2-m, and A3-1 to A3-m of 111-1 to 111-3. And by the electric power generated by the photovoltaic power generation, the direction of the arrow P1 (cells A1-1 to A1-m, A2-1 to A2-m of the three solar panels 111-1 to 111-3 from the -terminal 131). , The current flows in the direction toward A + terminal 132 through A3-1 to A3-m).
At this time, all the switches 13-1 to 13-n, 14-1 to 14-n, and 76 shown in FIG. 1 are closed. At this time, a higher voltage (DC power generated by solar power generation) is applied to the inverter 71 on the positive terminal side than on the negative terminal side. This DC power is converted into AC power by the inverter 71 and supplied to the transformer 73 side (system on the terminal 77 side).
As described above, the current generated by the solar power generation and flowing (in this embodiment, a direct current) can change according to the state of the strings (strings 11-1 to 11-n in the example of FIG. 1). For example, when there is a malfunction among the strings 11-1 to 11-n, or when there is a shadow such as vegetation, the current decreases.

[String operation during bypass diode inspection]
FIG. 3 is a diagram for explaining the outline of the operation of the string 11-1 at the time of inspection of the bypass diodes 151-1 to 151-3 according to the embodiment of the present invention.
The configuration of the string 11-1 shown in FIG. 3 is the same as the configuration shown in FIG.
When the bypass diodes 151-1 to 151-3 are inspected, the switch unit 41 is switched to the 1-2 state.

When the inspection of the bypass diodes 151-1 to 151-3 is performed, the string 11-1 is brought into a state where solar power generation is not performed. This state is realized, for example, during a night time period, or by covering the string 11-1 with a sheet or the like so that light from the outside is not irradiated.
Here, normally, during the night period or the period in which the string 11-1 is covered with a sheet or the like, since there is no irradiation of sunlight, power generation by sunlight is not performed. By using a sheet or the like that shields solar radiation, daytime inspection is also possible.

When the bypass diodes 151-1 to 151-3 are inspected, the inverter 71 converts AC power from the transformer 73 side (system on the terminal 77 side) into DC power and uses the DC power. The higher voltage is applied to the positive terminal side than to the negative terminal side. The DC power is supplied through a path between the inverter 71 and the string 11-1. Thus, in the string 11-1, the direction of the arrow P2 (the direction from the negative terminal 131 to the positive terminal 132, which is the cells A1-1 to A1-m, A2-1 to A2-m, A3-1 to A3). A current flows in the direction of passing through the bypass diodes 151-1 to 151-3 without passing through -m. By measuring whether or not the current flows (or the magnitude of the current), it is possible to determine whether or not the bypass diodes 151-1 to 151-3 are normal. Inspections 1-151-3 are realized. That is, in one string (each of n strings 11-1 to 11-n), current flows when all bypass diodes 151-1 to 151-3 are normal, but bypass diodes 151-1 to No current flows when an abnormality occurs in any one or more of 151-3. Further, in a plurality of strings (a combination of two or more of the n strings 11-1 to 11-n), the current flowing as a whole decreases according to the number of strings through which no current flows.
At this time, all the switches 13-1 to 13-n, 14-1 to 14-n, and 76 shown in FIG. 1 are closed.

  In the present embodiment, no abnormality other than the bypass diodes 151-1 to 151-3 is assumed, and even if no current flows due to an abnormality other than the bypass diodes 151-1 to 151-3, the bypass diode 151- Although it is determined that the abnormality is 1 to 151-3, as another configuration example, a sensor for detecting a predetermined abnormality other than the bypass diodes 151-1 to 151-3 is provided, and the bypass diode 151- A configuration may be used in which 1 to 151-3 abnormality and other abnormality are distinguished and determined.

  Here, the inverter 71 switches to the operation of converting the DC power from the strings 11-1 to 11-n into the AC power and outputting the AC power to the transformer 73 during solar power generation, and bypass diodes 151-1 to 151. At the time of inspection -3, the operation is switched to the operation of converting the AC power from the transformer 73 into the DC power and outputting it to the strings 11-1 to 11-n. This switching may be performed based on an operation performed by a person (user), for example, or automatically performed by the inverter 71 based on a predetermined rule (for example, a computer control program). May be. The operation performed by a person may be a remote operation, for example.

  In the present embodiment, as an example, when the bypass diodes 151-1 to 151-3 are inspected, the current from the system is continuously supplied to the strings 11-1 to 11-n via the inverter 71. For the strings 11-1 to 11-n, the switches 13-1 to 13-n and 14-1 to 14-n are turned on and connected to the inverter 71 side. As another example, when the bypass diodes 151-1 to 151-3 are inspected, the current from the system is continuously supplied to the strings 11-1 to 11-n via the inverter 71. At this time, one or more strings are connected. For each of the switches (switches 13-1 to 13-n, 14-1 to 14-n), a part of the n strings 11-1 to 11-n may be one. May be used that sequentially turns on and connects to the inverter 71 side.

As described above, in the present embodiment, the AC power on the grid side is changed to the DC power on the string 11-1 to 11-n side by using the time when the strings 11-1 to 11-n are not generating power. Apply current. And it is possible to detect the abnormality of the bypass diodes 151-1 to 151-3 by the current.
In the present embodiment, for example, it is determined whether or not an abnormality has occurred in the bypass diodes 151-1 to 151-3 by visually checking the current value of the ammeter 91 or the voltage value of the voltmeter 92. Is possible.

  As an example, when one or both of the current value and the voltage value is less than a predetermined threshold, it can be determined that an abnormality has occurred. For example, the threshold value may be variably set according to the number of strings to be inspected. For this determination, for example, both the current value of the ammeter 91 and the voltage value of the voltmeter 92 may be used, or any one of them may be used. Moreover, arbitrary values may be used for the threshold value related to the current value and the threshold value related to the voltage value, respectively.

  As another example, a reference pattern (reference pattern) for the relationship between the current value and the voltage value is stored, and the reference pattern and the measurement result (relationship between the measured current value and the measured voltage value). It is possible to determine that an abnormality has occurred when the degree of similarity is less than a predetermined threshold. As the reference pattern, for example, a pattern when the bypass diodes 151-1 to 151-3 to be inspected are normal (when there is no failure or the like) may be used. As the reference pattern, for example, a pattern when the current value is a constant value or a pattern when the voltage value is a constant value may be used. As the degree of similarity, any degree of similarity may be used, and here, a value indicating similarity is used as the degree of similarity is larger. For example, it is possible to determine that an abnormality has occurred when the relationship between the current value and the voltage value deviates from the reference pattern (beyond the allowable similarity).

Here, in the present embodiment, the switch unit 41 is switched to the 1-1 state during solar power generation, and is switched to the 1-2 state during inspection of the bypass diodes 151-1 to 151-3. This switching may be performed based on, for example, an operation performed by a person, or automatically performed by the switch unit 41 based on a predetermined rule (for example, a computer control program). Good. The operation performed by a person may be a remote operation, for example.
Further, the switching of the inverter 71 and the switching of the switch unit 41 may be linked to each other. For example, the switching of the other may be performed in response to the switching of one.

(Second configuration example)
[Configuration example of solar power generation system]
FIG. 4 is a diagram illustrating a schematic configuration example of the photovoltaic power generation system 201 according to an embodiment (second configuration example) of the present invention.
The solar power generation system 201 shown in FIG. 4 will be described in detail with respect to the differences from the solar power generation system 1 shown in FIG. 1, and the same points will be simplified by simplifying the description by attaching the same reference numerals. Omitted.

  The photovoltaic power generation system 201 shown in FIG. 4 is different from the photovoltaic power generation system 1 shown in FIG. 1 in that each of the string switches 13-1 to 13-n and 14-1 to 14 shown in FIG. In place of −n, each string system switch unit 211-1 to 211 -n is provided, and n string systems are used instead of the switch unit 41 common to the n string systems shown in FIG. 1. Are different in that an ammeter 91 is provided between the switch 251 and the + terminal of the inverter 71.

  Each switch part (each of the switch parts 211-1 to 211-n) has two sections (each of the sections 213-1 to 213-n and each of the sections 214-1 to 214-n), Three contacts (each of the contacts 215-1 to 215-n, each of the contacts 216-1 to 216-n, and each of the contacts 217-1 to 217-n) are provided.

Here, the configuration and operation of the n string switch units 211-1 to 211-n are the same. Here, the switch unit 211-1 will be described as an example.
The plus (+) contact 215-1 and the plus contact 217-1 are connected to the plus terminal (the plus terminal of the string 11-1) of the connection box 12-1. The minus (−) contact 216-1 is connected to the minus terminal of the junction box 12-1 (the minus terminal of the string 11-1). The intercept 213-1 on the + terminal side is connected to the switch 251 on the + terminal side. The terminal 214-1 on the minus terminal side is connected to the switch 252 on the minus terminal side.
The switch unit 211-1 has a positive terminal 213-1 and a positive contact 215-1 connected to the negative terminal 214-1 and a negative terminal 214-1 and a negative terminal 216-1. The connected state (hereinafter, also referred to as “second state −1”), the positive terminal side segment 213-1 and the negative contact 216-1 are connected and the negative terminal side segment 214. −1 and the contact 217-1 on the + terminal side are switched (hereinafter also referred to as “second state”).

The switch 251 on the + terminal side is connected to the + terminal of the inverter 71 (via the ammeter 91), and each of the intercepts 213-1 to 213-n on the + terminal side of n string systems. Connected with.
The switch 252 on the −terminal side is connected to the −terminal of the inverter 71 and is connected to each of the intercepts 214-1 to 214 -n on the −terminal side of the n string systems.

In the solar power generation system 1 according to the present embodiment, each string 11-1 to 11-n generates power using sunlight. The generated electric power includes connection boxes 12-1 to 12-n, switch units 211-1 to 211-n, switches 251, 252, inverter 71, terminal 72, transformer 73, terminal 74, terminal 75, switch 76, and terminal. The terminal 77 is supplied to the connection destination of the terminal 77 through 77. The connection destination of the terminal 77 is, for example, a general power system (system).
Each switch 251, 252, 76 passes power when closed (when turned on) and does not pass power when opened (when turned off).

Here, in the present embodiment, the n switch units 211-1 to 211-n are switched to the 2-1 state at the time of photovoltaic power generation, and the second switch unit 211-1 to 151-3 is inspected at the second time. -2 state. This switching may be performed based on, for example, an operation performed by a person, or automatically performed by the switch unit 41 based on a predetermined rule (for example, a computer control program). Good. The operation performed by a person may be a remote operation, for example.
Further, the switching of the inverter 71 and the switching of the n switch units 211-1 to 211-n may be linked to each other. For example, the switching of the other is performed in response to the switching of one. It may be broken.
The operations of the strings 11-1 to 11-n during photovoltaic power generation are the same as those shown in FIG. 2, and the strings 11-1 to 11-n during the inspection of the bypass diodes 151-1 to 151-3. The operation of is the same as that shown in FIG.

(Third configuration example)
[Configuration example of solar power generation system]
FIG. 5 is a diagram illustrating a schematic configuration example of a solar power generation system 301 according to an embodiment (third configuration example) of the present invention.
The solar power generation system 301 shown in FIG. 5 will be described in detail with respect to the points different from the solar power generation system 1 shown in FIG. 1, and the same points will be assigned the same reference numerals to simplify the description or Omitted. The switches 251 and 252 shown in FIG. 5 are the same as those shown in FIG.

The photovoltaic power generation system 301 shown in FIG. 5 is measured in place of the inverter 71, the switch unit 41, the ammeter 91, and the voltmeter 92 shown in FIG. 1 as compared with the photovoltaic power generation system 1 shown in FIG. It is different in that a portion 371 and switches 251 and 252 are provided.
In the present embodiment, the inverter 391 has a function of converting DC power on the n string system side to AC power on the transformer 73 side. However, the inverter 391 converts the AC power on the transformer 73 side to n string systems. It does not have to have a function of converting to DC power on the side of the side.

The measurement unit 371 includes an inverter 391 and a pulse generator 392.
The inverter 391 and the terminal 72 are connected, and the inverter 391 and the two switches 251 and 252 are connected.
The switch 251 on the + terminal side is connected to the + terminal of the inverter 71 and is connected to each of the switches 13-1 to 13-n on the + terminal side of the n string systems.
The switch 252 on the -terminal side is connected to the -terminal of the inverter 71 and is connected to each of the switches 14-1 to 14-n on the -terminal side of the n strings.
The negative terminal of the pulse generator 392 is connected to each of the n string-type switches 13-1 to 13-n in parallel with the switch 251 on the positive terminal side.
The + terminal of the pulse generator 392 is connected to each of the n string-related switches 14-1 to 14-n in parallel with the switch 252 on the − terminal side.

In the solar power generation system 301 according to the present embodiment, electric power is generated using sunlight in each of the strings 11-1 to 11-n. The generated electric power includes connection boxes 12-1 to 12-n, switches 13-1 to 13-n, 14-1 to 14-n, switches 251, 252, inverter 391, terminal 72, transformer 73, terminal 74, The voltage is supplied to the connection destination of the terminal 77 via the terminal 75, the switch 76, and the terminal 77. The connection destination of the terminal 77 is, for example, a general power system (system).
Each switch 251, 252, 76 passes power when closed (when turned on) and does not pass power when opened (when turned off).

  Here, in the present embodiment, the two switches 251 and 252 are switched to a state of being connected to the inverter 391 at the time of photovoltaic power generation, and are not connected to the inverter 391 at the time of inspection of the bypass diodes 151-1 to 151-3. It is switched to (disconnected state). This switching may be performed based on, for example, an operation performed by a person, or automatically performed by the switch unit 41 based on a predetermined rule (for example, a computer control program). Good. The operation performed by a person may be a remote operation, for example.

In the present embodiment, the pulse generator 392 does not operate during solar power generation, and operates during inspection of the bypass diodes 151-1 to 151-3.
Specifically, when inspecting the bypass diodes 151-1 to 151-3, the pulse generator 392 generates a predetermined pulse and outputs the pulse to each of the n strings 11-1 to 11-n. Output. The pulse is, for example, a voltage pulse or a current pulse. An arbitrary waveform may be used as the waveform of the pulse. The pulse is supplied via a path between the inverter 391 and the strings 11-1 to 11-n.
At this time, the switches (corresponding to the switches 13-1 to 13-n and 14-1 to 14-n) are sequentially turned on for each of the n strings 11-1 to 11-n. And may be connected to the pulse generator 392 side. Accordingly, the bypass diodes 151-1 to 151-3 can be inspected for each of the strings 11-1 to 11-n.

  In addition, when inspecting the bypass diodes 151-1 to 151-3, the measurement unit 371 outputs a pulse output from the pulse generator 392 (for example, a pulse having the same waveform, or a waveform having a corresponding waveform even if not completely the same). It is determined whether or not (pulse) has returned to the pulse generator 392 side. When the measurement unit 371 determines that the pulse has returned to the pulse generator 392, the measurement unit 371 outputs the pulse to be inspected (among the n strings 11-1 to 11-n). If it is determined that the pulse has not returned to the pulse generator 392 side, it is determined that an abnormality has occurred in the string to be inspected. This determination function may be provided in the pulse generator 392, for example.

The pulse generator 392 outputs a pulse so that a current flows in the direction P2 shown in FIG.
In addition, the switching of the operation by the pulse generator 392 (in this embodiment, whether or not to output a pulse) and the switching of the switches 251 and 252 may be linked to each other. The other switching may be performed in response to being performed.
The operations of the strings 11-1 to 11-n during photovoltaic power generation are the same as those shown in FIG. 2, and the strings 11-1 to 11-n during the inspection of the bypass diodes 151-1 to 151-3. The operation of is the same as that shown in FIG.

  Here, in the example of FIG. 5, the case where the pulse generator 392 is provided separately from the inverter 391 is shown, but the function of the pulse generator 392 may be provided in the inverter 391. That is, both the function of the pulse generator 392 and the function of the inverter 391 may be configured by a single circuit.

(Fourth configuration example)
[Configuration example of solar power generation system]
FIG. 6 is a diagram illustrating a schematic configuration example of a solar power generation system 401 according to an embodiment (fourth configuration example) of the present invention.
The solar power generation system 401 shown in FIG. 6 will be described in detail with respect to the points different from the solar power generation system 1 shown in FIG. Omitted. Further, the switches 251 and 252 shown in FIG. 6 are the same as those shown in FIG.

A photovoltaic power generation system 401 shown in FIG. 6 is different from the photovoltaic power generation system 1 shown in FIG. 1 in that switches 251 and 252 are used instead of the switch unit 41, the ammeter 91 and the voltmeter 92 shown in FIG. And the measurement unit 411 is different.
In this embodiment, the inverter 71 has a function of converting DC power on the n string system side to AC power on the transformer 73 side. However, the inverter 71 converts the AC power on the transformer 73 side to n string systems. It does not have to have a function of converting to DC power on the side of the side.

The measurement unit 411 includes a storage battery 431.
The inverter 71 and the terminal 72 are connected, and the inverter 71 and the two switches 251 and 252 are connected.
The switch 251 on the + terminal side is connected to the + terminal of the inverter 71 and is connected to each of the switches 13-1 to 13-n on the + terminal side of the n string systems.
The switch 252 on the -terminal side is connected to the -terminal of the inverter 71 and is connected to each of the switches 14-1 to 14-n on the -terminal side of the n strings.
The negative terminal of the storage battery 431 is connected to each of the n string-type switches 13-1 to 13-n in parallel with the positive terminal switch 251.
The + terminal of the storage battery 431 is connected to each of the n string-type switches 14-1 to 14-n in parallel with the switch 252 on the − terminal side.

In the solar power generation system 401 according to the present embodiment, each string 11-1 to 11-n generates power using sunlight. The generated electric power includes connection boxes 12-1 to 12-n, switches 13-1 to 13-n, 14-1 to 14-n, switches 251, 252, inverter 71, terminal 72, transformer 73, terminal 74, The voltage is supplied to the connection destination of the terminal 77 via the terminal 75, the switch 76, and the terminal 77. The connection destination of the terminal 77 is, for example, a general power system (system).
Each switch 251, 252, 76 passes power when closed (when turned on) and does not pass power when opened (when turned off).

  Here, in this embodiment, the two switches 251 and 252 are switched to a state of being connected to the inverter 71 at the time of photovoltaic power generation, and are not connected to the inverter 71 at the time of inspection of the bypass diodes 151-1 to 151-3. It is switched to (disconnected state). This switching may be performed based on, for example, an operation performed by a person, or automatically performed by the switch unit 41 based on a predetermined rule (for example, a computer control program). Good. The operation performed by a person may be a remote operation, for example.

In the present embodiment, the measurement unit 411 switches the power generated by the solar power generation to the state of being stored by the storage battery 431 during the solar power generation, and the power stored in the storage battery 431 during the inspection of the bypass diodes 151-1 to 151-3. Is switched to a state of discharging (outputting).
Specifically, when inspecting the bypass diodes 151-1 to 151-3, the storage battery 431 applies a predetermined voltage to each of the n strings 11-1 to 11-n. The voltage is higher at the positive terminal of the storage battery 431 than at the negative terminal. The voltage is supplied through a path between the inverter 71 and the strings 11-1 to 11-n.
At this time, the switches (corresponding to the switches 13-1 to 13-n and 14-1 to 14-n) are sequentially turned on for each of the n strings 11-1 to 11-n. May be connected to the storage battery 431 side. Thereby, it is possible to perform an inspection for each of the strings 11-1 to 11-n.

In addition, when the bypass diodes 151-1 to 151-3 are inspected, the measurement unit 411 measures (detects) the value of the current that flows through the bypass diodes 151-1 to 151-3 by the voltage applied by the storage battery 431. The measurement unit 411 may include an ammeter that measures the current value, or may include a voltmeter that measures a voltage value corresponding to the current value.
By measuring whether or not the current flows (or the magnitude of the current), it is possible to determine whether or not the bypass diodes 151-1 to 151-3 are normal. Inspections 1-151-3 are realized. That is, in one string (each of n strings 11-1 to 11-n), current flows when all bypass diodes 151-1 to 151-3 are normal, but bypass diodes 151-1 to No current flows when an abnormality occurs in any one or more of 151-3. Further, in a plurality of strings (a combination of two or more of the n strings 11-1 to 11-n), the current flowing as a whole decreases according to the number of strings through which no current flows.

In addition, the switching of the operation by the storage battery 431 (in this embodiment, the operation of storing or discharging) and the switching of the switches 251 and 252 may be linked to each other. Depending on what is done, the other switching may be performed.
The operations of the strings 11-1 to 11-n during photovoltaic power generation are the same as those shown in FIG. 2, and the strings 11-1 to 11-n during the inspection of the bypass diodes 151-1 to 151-3. The operation of is the same as that shown in FIG.

[Configuration of photovoltaic power generation system equipped with measuring device]
FIG. 7 is a diagram illustrating a schematic configuration example of a solar power generation system 1A including the measurement device 501 according to the embodiment of the present invention.
The solar power generation system 1 </ b> A is the same as the configuration shown in FIG. 1 except that the measurement apparatus 501 is provided. For convenience of explanation, in the example of FIG. 4, the same reference numerals are given to the same components as in the example of FIG. 1.
Measuring device 501 is connected to each of ammeter 91 and voltmeter 92.

FIG. 8 is a diagram illustrating a schematic configuration example of the measurement apparatus 501 according to an embodiment of the present invention.
The measurement apparatus 501 includes an input unit 511, an output unit 512, a storage unit 513, a measurement unit 514, and a control unit 515. The control unit 515 includes a determination unit 531.
The input unit 511 inputs information from outside. For example, the input unit 511 may include an operation unit that receives an operation performed by a person. In addition, the input unit 511 may input information output from an external device, for example. The operation unit may be provided separately from the measurement device 501 and connected to the measurement device 501 via a wired or wireless line so as to be communicable.
The output unit 512 outputs information to the outside. The output unit 512 may include, for example, a display unit that displays information on a screen for a person. The output unit 512 may include a speaker that outputs sound to a person, for example. The output unit 512 may output information to an external device, for example. Note that the display unit or the speaker may be provided separately from the measurement device 501 and may be connected to the measurement device 501 via a wired or wireless line so as to be communicable.

  The storage unit 513 stores information. The storage unit 513 may store, for example, a control program or parameters used by the control unit 515. Further, the storage unit 513 may store, for example, measurement result information, determination result information, or the like. In the example of FIG. 8, the storage unit 513 is provided integrally with the measurement device 501, but as another configuration example, the storage unit 513 is provided separately from the measurement device 501, and is wired or connected to the measurement device 501. You may connect so that communication is possible via a wireless line.

The measurement unit 514 measures (detects) a value to be measured.
In the example of FIG. 7, the value to be measured is any one or both of the current value of the ammeter 91 and the voltage value of the voltmeter 92.

  The control unit 515 performs processing or control in the measurement apparatus 501. For example, the control unit 515 may perform processing for determining the presence or absence of a failure or the like based on the measurement result acquired by the measurement unit 514 by the determination unit 531. The control unit 515 may perform other analysis processing based on the measurement result acquired by the measurement unit 514, for example. The control unit 515 may include, for example, a CPU (Central Processing Unit), and may perform processing or control using a control program or parameters stored in the storage unit 513.

  In the present embodiment, two or more different strings (all strings 11-1 to 11-n in the example of FIG. 7) are provided with a common measuring device 501, and the measuring device 501 includes these two or more strings. For each of the different strings, for example, measurements are performed separately in order. As another configuration example, one measuring device may be provided for each of the strings 11-1 to 11-n.

In the present embodiment, the measuring apparatus 501 determines whether a failure or the like has occurred in each of the strings 11-1 to 11-n based on the result measured by the measuring unit 514 by the determining unit 531. To do. Any method may be used as the determination method.
The measured value (current value or voltage value) may be, for example, an average value that is averaged over time.
Moreover, when performing determination based on a threshold value, a different value may be used as the threshold value depending on predetermined conditions such as temperature, amount of solar radiation, time, season, and the like. In this case, the measuring apparatus 501 may include a detection unit (for example, a sensor) that detects the condition, and may set a threshold value that meets the condition according to the detection result.

In the measurement apparatus 501, any timing may be used as the timing at which the measurement unit 514 measures the value to be measured.
As an example, the measurement apparatus 501 may store information for determining a predetermined measurement timing and automatically perform measurement at the measurement timing. The measurement timing may be, for example, a predetermined timing such as nighttime, or may be a fixed cycle timing. The timing such as nighttime may be a timing at which inspection is performed. The fixed cycle timing may be, for example, once a day, once a month, or the like.
As another example, the measurement apparatus 501 may receive an operation performed by a person and perform measurement at a measurement timing corresponding to the operation. As a specific example, the measurement apparatus 501 may include a button or a lever (for example, as the input unit 511) for manually instructing a person to perform measurement.
Similarly, in the measurement apparatus 501, any timing may be used as the timing at which the determination unit 531 performs determination regarding a failure or the like. For example, the determination process may be performed based on the measurement result following the measurement process.

In addition, the measurement apparatus 501 may output information on the measurement result or the determination result by display or sound (may be sound) by the output unit 512. As an example, the measuring apparatus 501 performs one or both of displaying and outputting measurement result information on the display unit screen and / or displaying and outputting determination result information on the display unit screen. As another example, the measurement apparatus 501 performs one or both of outputting information of measurement results from a speaker and outputting information of determination results from a speaker. The determination result information may include, for example, information on the presence or absence of a failure or the like. The information on the determination result may be information representing a warning about the presence of a failure, for example.
Further, the measuring apparatus 501 may receive an operation performed by a person and perform an operation (for example, display output or sound output) corresponding to the operation based on the received operation.

In addition, a configuration in which a person looks at a measurement result by the measurement apparatus 501 and determines the presence or absence of a failure or the like may be used.
That is, the measuring device 501 measures at least the value to be measured, and the subsequent analysis or determination may be performed by a person, or shared between the person and the measuring device 501. Also good.
In addition, the measuring device 501 may be portable by a person, for example, or may be installed near the installation position of the measurement target.

  Further, when a plurality of measuring devices 501 are provided, a device (monitoring device) for monitoring them may be provided. In this case, each measurement device 501 may transmit information on the measurement result or the determination result, and the monitoring device may receive and collect the information. Note that communication (transmission and reception) may be performed using, for example, a wired line, or may be performed using a wireless line.

  Here, in the example of FIG. 7, the case where the measuring apparatus 501 is provided in the configuration shown in FIG. 1 is shown. As another configuration example, a solar power generation system including a measurement device similar to the measurement device 501 in the configuration illustrated in FIG. 4 may be implemented. As another configuration example, in the configuration illustrated in FIG. 5, a photovoltaic power generation system including a measurement device including the function of the measurement unit 371 may be implemented. As another configuration example, in the configuration illustrated in FIG. 6, a photovoltaic power generation system including a measurement device including the function of the measurement unit 411 may be implemented.

[Configuration of monitoring system]
FIG. 9 is a diagram illustrating a schematic configuration example of a monitoring system 601 according to an embodiment of the present invention.
The monitoring system 601 includes a measuring device 611, a network 613, and a monitoring device 612.
The measuring device 611 and the monitoring device 612 are connected to the network 613.
The monitoring device 612 and the measuring device 611 communicate via the network 613.

  Here, the configuration of the photovoltaic power generation system according to the example of FIG. 9 (illustration of the whole system is omitted) is different from the configuration shown in FIG. 7 in that the measuring device 611 is replaced with the measuring device 501 shown in FIG. Provided that the monitoring device 612 and the network 613 are further provided. Then, the measurement device 611 is connected to the monitoring device 612 via the network 613.

FIG. 10 is a diagram illustrating a schematic configuration example of a measurement apparatus 611 according to an embodiment of the present invention.
The measuring device 611 includes an input unit 711, an output unit 712, a storage unit 713, a communication unit 714, a measurement unit 715, and a control unit 716. The control unit 716 includes a determination unit 731.
Here, the functions of the input unit 711, the output unit 712, the storage unit 713, the measurement unit 715, the control unit 716, and the determination unit 731 are the input unit 511, the output unit 512, and the measurement unit 501 shown in FIG. The functions of the storage unit 513, the measurement unit 514, the control unit 515, and the determination unit 531 are the same.

The communication unit 714 communicates with an external device via the network 613. For example, the communication unit 714 communicates with the monitoring device 612 via the network 613. As a specific example, the communication unit 714 transmits one or more of measurement result information, determination result information, and other analysis result information to the monitoring device 612. Further, the communication unit 714 may receive operation instruction information from the monitoring device 612.
In the example of FIG. 10, the communication unit 714 connected to the network 613 is shown separately from the input unit 711 and the output unit 712. For example, the function of the communication unit 714 is the same as that of the input unit 711 and the output unit 712. It may be realized by a function.

FIG. 11 is a diagram illustrating a schematic configuration example of the monitoring device 612 according to an embodiment of the present invention.
The monitoring device 612 includes an input unit 811, an output unit 812, a storage unit 813, a communication unit 814, and a control unit 815.
The input unit 811 inputs information from outside. The input unit 811 may include, for example, an operation unit that receives an operation performed by a person. Further, the input unit 811 may input information output from an external device, for example. The operation unit may be provided separately from the monitoring device 612 and connected to the monitoring device 612 via a wired or wireless line so as to be communicable.
The output unit 812 outputs information to the outside. The output unit 812 may include, for example, a display unit that displays information on a screen for a person. The output unit 812 may include a speaker that outputs sound to a person, for example. The output unit 812 may output information to an external device, for example. Note that the display unit or the speaker may be provided separately from the monitoring device 612 and connected to the monitoring device 612 via a wired or wireless line so as to be communicable.

  The storage unit 813 stores information. The storage unit 813 may store a control program or parameters used by the control unit 815, for example. Further, the storage unit 813 may store, for example, information received from the measurement device 611, and may store measurement result information, determination result information, or the like as a specific example. In the present embodiment, the storage unit 813 is provided integrally with the monitoring device 612. However, as another configuration example, the storage unit 813 is provided separately from the monitoring device 612, and is wired or wirelessly connected to the monitoring device 612. May be communicably connected via the other line.

The communication unit 814 communicates with an external device via the network 613. For example, the communication unit 814 communicates with the measurement device 611 via the network 613. As a specific example, the communication unit 814 receives one or more of measurement result information, determination result information, information on other analysis results, and the like from the measurement device 611. In addition, the communication unit 814 may transmit operation instruction information or the like to the measurement apparatus 611.
In the example of FIG. 11, the communication unit 814 connected to the network 613 is shown separately from the input unit 811 and the output unit 812. For example, the function of the communication unit 814 is the same as that of the input unit 811 and the output unit 812. It may be realized by a function.

The control unit 815 performs processing or control in the monitoring device 612.
As an example, when receiving measurement result information from the measurement device 611 by the communication unit 814, the control unit 815 determines the presence or absence of a failure or the like based on the acquired (in this case, received) measurement result information. Processing may be performed, and other analysis processing may be performed based on the obtained measurement result.
As another example, when information on the determination result is received from the measurement device 611 by the communication unit 814, another analysis process may be performed based on the acquired information on the determination result (here, received).
Note that the control unit 815 may include, for example, a CPU, and may perform processing or control using a control program or parameters stored in the storage unit 813.

  In this configuration example, as an example, information of measurement results obtained by the measurement device 611 is collected by one monitoring device 612, and the monitoring device 612 determines whether or not there is a failure based on the information of the measurement results. Can be done. In this configuration example, as another example, it is possible to collect information of the determination result obtained by the measuring device 611 by one monitoring device 612. In the monitoring device 612, for example, information on measurement results obtained by the measurement device 611, information on determination results obtained from the measurement results, and the like can be stored in the storage unit 813 and collectively managed.

[Summary of the above embodiments]
As described above, in the solar power generation system 1 according to the present embodiment, the solar power generation module (strings 11-1 to 11-n, solar panels 31-1 to 31-n, cells in the example of FIG. 1). It is possible to simplify the inspection of the bypass diodes 151-1 to 151-3 provided in the circuit.
Moreover, in the photovoltaic power generation system 1A according to the present embodiment, the measurement device 501 can perform measurement at the time of inspection of the bypass diodes 151-1 to 151-3.
In the monitoring system 601 according to the present embodiment, information such as a measurement result by the measuring device 611 can be collected and managed by the monitoring device 612.

In the present embodiment, the bypass diodes 151-1 to 151-1 can be installed without removing and attaching the solar panels 31-1 to 31-n (or cells) at the site where the photovoltaic power generation systems 1 and 1A are installed. 151-3 inspection is possible. For this reason, it is possible to significantly reduce the work time required for the inspection of the bypass diodes 151-1 to 151-3. In the present embodiment, for example, it is possible to detect disconnection of the bypass diodes 151-1 to 151-3 in a short time. For example, it is possible to eliminate the need to stop solar power generation in the daytime by performing inspection of the bypass diode during a period when the solar power generation is not used, such as at night.
In the present embodiment, for example, when solar panels 31-1 to 31-n (or cells) are inspected for bypass diodes 151-1 to 151-3 by a manufacturer or the like before factory shipment, or If not, it is possible to detect an abnormality by inspection of the bypass diodes 151-1 to 151-3 after installation.
Thus, in this embodiment, the inspection of the bypass diodes 151-1 to 151-3 can be efficiently performed at the site. In the present embodiment, for example, a method for inspecting the bypass diodes 151-1 to 151-3 performed by one or both of a person and a device can be implemented.

As one configuration example, a photovoltaic power generation module (in the examples of FIGS. 1 and 4 to 7, the string 11-1) having a bypass diode (bypass diodes 151-1 to 151-3 in the examples of FIGS. 2 and 3). 11-n, solar panels 31-1 to 31-n, cells) and inverters that convert DC current generated by power generation by the solar power generation module into AC current (FIGS. 1, 4-7) In the example, the same direction as the time of solar power generation (the direction of the current flowing at the time of solar power generation) with respect to the solar power generation module via the inverter 71, 391) and the path between the solar power generation module and the inverter. A photovoltaic power generation system (in the example of FIGS. 1 and 4 to 7, the photovoltaic power generation systems 1, 1 </ b> A, 201, 301, and the inspection output unit that performs output for flowing current in the same direction). 01) a.
As an example of the configuration, in the photovoltaic power generation system, the inspection output unit is provided in an inverter, converts the input alternating current into a direct current, and outputs the direct current to the photovoltaic power generation module (examples in FIGS. 1 and 4).
As a configuration example, in the photovoltaic power generation system, the inspection output unit includes a pulse generator (in the example of FIG. 5, a pulse generator 392) that generates a voltage or current pulse and outputs the pulse to the photovoltaic power generation module ( Example of FIG. 5).
As a configuration example, in the photovoltaic power generation system, the inspection output unit includes a storage battery (storage battery 431 in the example of FIG. 6) that applies a voltage to the photovoltaic power generation module (example of FIG. 6).
As one configuration example, in a solar power generation system, a value related to a current flowing through the solar power generation module or a voltage applied to the solar power generation module (for example, one or both of a current value and a voltage value, and a current value of a pulse Alternatively, it may be a voltage value.) Measuring unit (ammeter 91 and voltmeter 92 in the example of FIGS. 1 and 4, measuring unit 371 in the example of FIG. 5, measuring unit 411 in the example of FIG. 6, FIGS. In the example of FIG. 11, the measurement units 514 and 715 of the measurement devices 501 and 611 are provided.
As one configuration example, for the photovoltaic power generation module via a path between the inverter and the photovoltaic power generation module that converts the direct current generated by the power generation by the photovoltaic power generation module having a bypass diode into an alternating current and outputs the alternating current. Output the current in the same direction as during solar power generation, measure the value related to the current flowing through the solar power generation module or the voltage applied to the solar power generation module, and then generate solar power based on the measurement results. This is an inspection method for inspecting a module.

Here, a program for realizing the functions of the devices according to the above-described embodiments (for example, the measuring devices 501, 611, the monitoring device 612) is recorded (stored) in a computer-readable recording medium (storage medium). Then, the processing may be performed by causing the computer system to read and execute the program recorded on the recording medium.
Here, the “computer system” may include an operating system (OS) or hardware such as a peripheral device.
The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a writable non-volatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disc), A storage device such as a hard disk built in a computer system.
Furthermore, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (DRAM) inside a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Dynamic Random Access Memory)) that holds a program for a certain period of time is also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the above program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

DESCRIPTION OF SYMBOLS 1, 1A, 201, 301, 401 ... Solar power generation system, 11-1 to 11-n ... String, 12-1 to 12-n ... Connection box, 13-1 to 13-n, 14-1 to 14- n, 76, 251 to 252 ... switch, 31-1 to 31-n, 111-1 to 111-3 ... solar panel, 41, 211-1 to 211-n ... switch unit, 51 to 52, 213-1 213-n, 214-1 to 214-n, sections 53-55, 215-1 to 215-n, 216-1 to 216-n, 217-1 to 217-n, contacts, 71, 391, inverters 72, 74 to 75, 77 ... terminal, 73 ... transformer, 91 ... ammeter, 92 ... voltmeter, 131 ... minus terminal, 132 ... plus terminal, 151-1 to 151-3 ... bypass diode, 171 ... light, A1-1 to A1-m, A2- ~ A2-m, A3-1 ~ A3-m ... cell, P1, P2 ... direction, 371, 411, 514, 715 ... measuring unit, 392 ... pulse generator, 431 ... storage battery, 501 ... measuring device, 511, 711 , 811 ... input unit, 512, 712, 812 ... output unit, 513, 713, 813 ... storage unit, 515, 716, 815 ... control unit, 531, 611, 731 ... determination unit, 601 ... monitoring system, 612 ... monitoring Device, 613 ... Network, 714, 814 ... Communication unit

Claims (6)

A photovoltaic module having a bypass diode;
An inverter that converts a direct current generated by power generation by the solar power generation module into an alternating current and outputs the alternating current;
An inspection output unit that performs an output for passing a current in the same direction as during solar power generation to the solar power generation module via a path between the solar power generation module and the inverter;
A solar power generation system comprising: The inspection output unit is provided in the inverter, converts the input alternating current into a direct current and outputs the direct current to the photovoltaic power generation module,
The photovoltaic power generation system according to claim 1. The inspection output unit includes a pulse generator that generates a voltage or current pulse and outputs the pulse to the photovoltaic power generation module.
The photovoltaic power generation system according to claim 1. The inspection output unit includes a storage battery that applies a voltage to the solar power generation module.
The photovoltaic power generation system according to claim 1. A measuring unit for measuring a value relating to a current flowing through the photovoltaic power generation module or a voltage applied to the photovoltaic power generation module;
The photovoltaic power generation system according to any one of claims 1 to 4. The solar power generation module receives sunlight through a path between the inverter that converts a direct current generated by power generation by the solar power generation module having a bypass diode into an alternating current and outputs the alternating current. Output for flowing current in the same direction as during power generation, measure a value related to the current flowing through the solar power generation module or the voltage applied to the solar power generation module, and based on the measurement results, the solar power generation Check the module,
Inspection method.

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