JP2021189083A - Determination device and determination method - Google Patents

Abstract

To realize a more excellent function in a system capable of determining a state of a photovoltaic power generation system.SOLUTION: A determination device is a determination device used for a photovoltaic power generation system including a plurality of power converters, and a plurality of power generation sections including solar cell panels are electrically connected to the power converter. The determination device comprises: an acquisition section for acquiring measurement information including at least one of a current measurement result and a voltage measurement result of each power generation section; and a determination section that performs determination processing for determining an operational state of at least one power converter of the plurality of power converters on the basis of the plurality of pieces of measurement information acquired by the acquisition section.SELECTED DRAWING: Figure 8

Description

The present disclosure relates to a determination device and a determination method.

In recent years, techniques for monitoring photovoltaic power generation systems and discriminating abnormalities have been developed. For example, Japanese Patent Application Laid-Open No. 2012-205878 (Patent Document 1) discloses the following monitoring system for photovoltaic power generation. That is, the photovoltaic power generation monitoring system is a photovoltaic power generation monitoring system that monitors the power generation status of the solar panel with respect to the photovoltaic power generation system that aggregates the outputs from the plurality of solar panels and sends them to the power conversion device. Therefore, a measuring device that is provided in a place where output electric paths from the plurality of solar panels are integrated to measure the amount of power generated by each solar panel, and a measuring device that is connected to the measuring device and has a power generation amount by the measuring device. The solar panel via the lower communication device having a function of transmitting measurement data, the upper communication device having a function of receiving the measurement data transmitted from the lower communication device, and the upper communication device. It is provided with a determination device having a function of collecting the measurement data for each. The determination device determines the presence or absence of an abnormality based on the difference in the amount of power generation at the same time point for each of the solar cell panels, or the maximum value or the total amount of the amount of power generation for each of the solar cell panels during a predetermined period. The presence or absence of an abnormality is determined based on the value.

Japanese Unexamined Patent Publication No. 2012-205878

Beyond such a technique described in Patent Document 1, a technique capable of realizing better functions in a system capable of determining the state of a photovoltaic power generation system is desired.

The present invention has been made to solve the above-mentioned problems, and an object thereof is a determination device and a determination method capable of realizing better functions in a system capable of determining the state of a photovoltaic power generation system. Is to provide.

The determination device of the present disclosure is a determination device used in a solar power generation system including a plurality of power conversion devices, in which a plurality of power generation units including a solar cell panel are electrically connected to the power conversion device, and each of the above is described. An acquisition unit that acquires measurement information including at least one of a current measurement result and a voltage measurement result of the power generation unit, and a plurality of power conversion devices based on the plurality of measurement information acquired by the acquisition unit. It is provided with a determination unit that performs a determination process for determining the operating state of at least one of the power conversion devices.

The determination method of the present disclosure is a determination method in a determination device used in a solar power generation system including a plurality of power conversion devices, in which a plurality of power generation units including a solar cell panel are electrically connected to the power conversion device. , A step of acquiring measurement information including at least one of a current measurement result and a voltage measurement result of each of the power generation units, and among the plurality of power conversion devices based on the acquired plurality of the measurement information. The step includes determining the operating state of at least one of the power conversion devices.

The present disclosure can be realized not only as a determination device provided with such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes a part or all of the determination device, or as a determination system including the determination device. obtain. Further, the present disclosure can be realized as a program for causing a computer to execute a processing step in the determination method.

According to the present disclosure, it is possible to realize a better function in a system capable of determining the state of a photovoltaic power generation system.

FIG. 1 is a diagram showing a configuration of a photovoltaic power generation system according to an embodiment of the present disclosure. FIG. 2 is a diagram showing a configuration of a PCS unit according to an embodiment of the present disclosure. FIG. 3 is a diagram showing a configuration of a current collector unit according to an embodiment of the present disclosure. FIG. 4 is a diagram showing a configuration of a solar cell unit according to an embodiment of the present disclosure. FIG. 5 is a diagram showing a configuration of a determination system according to an embodiment of the present disclosure. FIG. 6 is a diagram showing a configuration of a monitoring device in the determination system according to the embodiment of the present disclosure. FIG. 7 is a diagram showing the determination target of the determination system according to the embodiment of the present disclosure as a whole. FIG. 8 is a diagram showing a configuration of a determination device according to an embodiment of the present disclosure. FIG. 9 is a diagram showing an example of a correspondence table stored in a storage unit in the determination device according to the embodiment of the present disclosure. FIG. 10 is a diagram showing an example of each measurement result stored in the storage unit in the determination device according to the embodiment of the present disclosure. FIG. 11 is a diagram showing an example of measurement results of a current sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 12 is a diagram showing an example of measurement results of a voltage sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 13 is a diagram showing another example of the measurement result of the current sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 14 is a diagram showing another example of the measurement result of the voltage sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 15 is a flowchart defining an operation procedure when the determination device according to the embodiment of the present disclosure performs the PCS determination process and the power generation unit determination process.

First, the contents of the embodiments of the present disclosure will be listed and described.

(1) The determination device according to the embodiment of the present disclosure is a determination device used in a solar power generation system including a plurality of power conversion devices, and a plurality of power generation units including a solar cell panel are used in the power conversion device. Based on an acquisition unit that is electrically connected and acquires measurement information including at least one of a current measurement result and a voltage measurement result of each power generation unit, and a plurality of the measurement information acquired by the acquisition unit. Further, the present invention includes a determination unit that performs a determination process for determining the operating state of at least one of the plurality of power conversion devices.

Here, in a large-scale power plant or the like, while remote monitoring of the amount of power sold to the grid is performed, remote monitoring of the operating state of the power conversion device alone may not be performed. In such a power plant or the like, for example, when the amount of power sold is not zero but small, it is difficult to determine whether the cause is a malfunction of the power conversion device or the cause such as the weather.

On the other hand, since the operating state of the power conversion device can be determined by the above configuration, for example, when the amount of power sold is not zero but small, it is determined whether or not the power conversion device is the cause. can do. Further, by determining the operating state of the power conversion device alone, for example, the power conversion device in the stopped state can be specified. Therefore, it is possible to realize a better function in a system capable of determining the state of the photovoltaic power generation system.

(2) Preferably, in the determination process, the determination unit measures the voltage of each power generation unit connected to the power conversion device for at least any two of the plurality of power conversion devices. The representative value is specified, the representative values of the specified power conversion devices are compared with each other, and the operating state of the power conversion device for which the representative value is specified is determined based on the comparison result.

For example, when the power conversion device is in operation during the daytime, the measurement result of the voltage of the power generation unit connected to the power conversion device is near the optimum operating voltage at which the power generation amount of the solar cell panel is maximized. It changes with the value. On the other hand, when the power conversion device is switched from the operating state to the stopped state, the measurement result of the voltage of the power generation unit connected to the power conversion device rises to an open circuit voltage higher than the optimum operating voltage.

Therefore, as described above, by comparing the voltages corresponding to each power conversion device, for example, the operating state of the power conversion device whose voltage is measured higher than that of other power conversion devices is determined to be the stopped state. It is possible to determine the operating state of each power conversion device without performing complicated determination processing such as.

(3) Preferably, the determination unit performs the determination process based on the measurement result of the current of each power generation unit connected to at least one of the plurality of power conversion devices. ..

For example, when the power conversion device is switched from the operating state to the stopped state during the daytime, the measurement result of the current of the power generation unit connected to the power conversion device becomes a value near zero.

Therefore, with the above configuration, the operating state of each power conversion device can be determined without performing complicated determination processing such as determining the operating state of the power conversion device in which the current near zero is measured as the stopped state. It can be determined.

(4) More preferably, the determination unit performs the determination process based on the average value and the median value of the current measurement results of each power generation unit.

For example, a part of a plurality of power generation units provided under the same power conversion device is affected by a shadow and becomes an extremely low power generation state, so that the current measurement result of each power generation unit is polarized. Suppose you did. In such a case, if the current measurement result of the power generation unit affected by the shadow is specified as the median value of the current measurement result, a highly accurate determination result cannot be obtained.

Further, for example, in at least one of a plurality of power generation units provided under the same power conversion device, a problem such as offset deviation from another current sensor or backflow of output current may occur. There is. In such a case, the average value of the current measurement results of each power generation unit reflects the measurement result of the current of the power generation unit in which the defect has occurred, so that a highly accurate determination result cannot be obtained.

On the other hand, as described above, the determination process is performed based on both the average value and the median value of the current measurement results of each power generation unit, so that the operation state of the power conversion device can be determined with higher accuracy. be able to.

(5) Preferably, the acquisition unit acquires the measurement information including both the current measurement result and the voltage measurement result of each power generation unit, and the determination unit is among the plurality of power conversion devices. The determination process is performed based on both the current measurement result and the voltage measurement result of each power generation unit connected to at least one of the power conversion devices.

As described above, the configuration using both the voltage measurement result and the current measurement result of each power generation unit in the determination process makes it possible to determine the operating state of the power conversion device with even higher accuracy.

(6) The determination method according to the embodiment of the present disclosure is a determination method in a determination device used in a solar power generation system including a plurality of power conversion devices, and a plurality of power generation units including a solar cell panel generate the power. The step based on the step of acquiring measurement information electrically connected to the conversion device and including at least one of the current measurement result and the voltage measurement result of each power generation unit, and the plurality of acquired measurement information. The step includes determining the operating state of at least one of the plurality of power conversion devices.

Here, in a large-scale power plant or the like, while remote monitoring of the amount of power sold to the grid is performed, remote monitoring of the operating state of the power conversion device alone may not be performed. In such a power plant or the like, for example, when the amount of power sold is not zero but small, it is difficult to determine whether the cause is a malfunction of the power conversion device or the cause such as the weather.

On the other hand, since the operating state of the power conversion device can be determined by the above method, for example, when the amount of power sold is not zero but small, it is determined whether or not the power conversion device is the cause. can do. Further, by determining the operating state of the power conversion device alone, for example, the power conversion device in the stopped state can be specified. Therefore, it is possible to realize a better function in a system capable of determining the state of the photovoltaic power generation system.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

<Configuration and basic operation>
[Solar power generation system configuration]
FIG. 1 is a diagram showing a configuration of a photovoltaic power generation system according to an embodiment of the present disclosure.

With reference to FIG. 1, the photovoltaic power generation system 401 includes four PCS (Power Conditioning Subsystem) units 80 and a cubicle 6. The cubicle 6 includes a copper bar 73 and a transformer 10.

Although four PCS units 80 are typically shown in FIG. 1, a larger number or a smaller number of PCS units 80 may be provided.

FIG. 2 is a diagram showing a configuration of a PCS unit according to an embodiment of the present disclosure.

With reference to FIG. 2, the PCS unit 80 includes four current collector units 60 and a PCS (power conversion device) 8. The PCS 8 includes a copper bar 7, a power conversion unit 9, and a collection unit 21.

Although the four current collector units 60 are typically shown in FIG. 2, a larger number or a smaller number of current collector units 60 may be provided.

Further, the collecting unit 21 may be provided in an external device of the PCS 8 instead of being provided inside the PCS 8. Assuming that an external device provided with the collecting unit 21 is a collecting device, the collecting device is, for example, one of the aggregation lines 5 described later, which are provided in the vicinity of the PCS 8 and connected to each other via the copper bar 7 in the PCS 8. Connected to one.

FIG. 3 is a diagram showing a configuration of a current collector unit according to an embodiment of the present disclosure.

With reference to FIG. 3, the current collector unit 60 has four solar cell units 74.

Although the four solar cell units 74 are typically shown in FIG. 3, a larger number or a smaller number of solar cell units 74 may be provided.

FIG. 4 is a diagram showing a configuration of a solar cell unit according to an embodiment of the present disclosure.

With reference to FIG. 4, the solar cell unit 74 includes four power generation units 78A, 78B, 78C, 78D and a junction box 76. The power generation unit 78 has a solar cell panel 79. The junction box 76 has a copper bar 77. Hereinafter, each of the power generation units 78A, 78B, 78C, and 78D will also be referred to as a power generation unit 78.

Although the four power generation units 78 are typically shown in FIG. 4, a large number or a small number of power generation units 78 may be provided.

The power generation unit 78 is a string in which four solar cell panels 79 are connected in series in this example.

Although the four solar cell panels 79 are typically shown in FIG. 4, a larger number or a smaller number of solar cell panels may be provided.

In the photovoltaic power generation system 401, the output lines and the aggregation lines, that is, the power lines from the plurality of power generation units 78 are electrically connected to the cubicle 6 shown in FIG. 1, respectively.

More specifically, the output line 1 of the power generation unit 78 has a first end connected to the power generation unit 78 and a second end connected to the copper bar 77. Each output line 1 is aggregated into the aggregation line 5 via the copper bar 77. The copper bar 77 is provided inside, for example, the junction box 76.

When the power generation unit 78 receives sunlight, it converts the energy of the received solar energy into DC power and outputs the converted DC power to the output line 1.

With reference to FIGS. 3 and 4, the aggregation line 5 has a first end connected to the copper bar 77 and a second end connected to the copper bar 7 in the corresponding solar cell unit 74.

With reference to FIGS. 1 to 4, in the photovoltaic power generation system 401, as described above, each output line 1 from the plurality of power generation units 78 is aggregated into the aggregation line 5, and each aggregation line 5 is aggregated into the aggregation line 4. Each aggregation line 4 is electrically connected to the cubicle 6.

More specifically, in the PCS 8, the internal line 3 has a first end connected to the copper bar 7 and a second end connected to the power conversion unit 9.

In the PCS8, for example, when the power conversion unit 9 receives the DC power generated in each power generation unit 78 via the output line 1, the copper bar 77, the aggregation line 5, the copper bar 7, and the internal line 3, the DC power received. Is converted into AC power and output to the aggregation line 4.

The aggregation line 4 has a first end connected to the power conversion unit 9 and a second end connected to the copper bar 73.

In the cubicle 6, the AC power output from the power conversion unit 9 in each PCS 8 to each aggregation line 4 is output to the transformer 10 via the copper bar 73. Then, the AC power to which the height of the voltage is converted in the transformer 10 is output to the system.

[Judgment system configuration]
FIG. 5 is a diagram showing a configuration of a determination system according to an embodiment of the present disclosure.

With reference to FIG. 5, the photovoltaic power generation system 401 includes a determination system 301. The determination system 301 includes a determination device 101 and a plurality of monitoring devices 111.

FIG. 5 typically shows four monitoring devices 111 provided corresponding to one current collector unit 60, but a large number or a small number of monitoring devices 111 may be further provided.

In the determination system 301, information based on the measurement result by the sensor in the monitoring device 111 (hereinafter, also referred to as “measurement information”) is periodically or irregularly transmitted to the collection unit 21 in the PCS 8.

The monitoring device 111 is provided in, for example, the current collector unit 60. More specifically, four monitoring devices 111 are provided corresponding to each of the four solar cell units 74. Each monitoring device 111 is electrically connected to, for example, the corresponding output line 1 and aggregation line 5.

The monitoring device 111 measures the current of each output line 1 in the corresponding solar cell unit 74 by a sensor. Further, the monitoring device 111 measures the voltage of each output line 1 in the corresponding solar cell unit 74 by a sensor.

The collection unit 21 in the PCS 8 collects the measurement results of each monitoring device 111. More specifically, the collecting unit 21 collectively transmits, for example, a plurality of measurement information transmitted from each monitoring device 111 to the determination device 101.

The determination device 101 is provided near the PCS8, for example, and is electrically connected to the PCS8.

The monitoring device 111 and the PCS 8 transmit and receive measurement information by, for example, performing power line communication (PLC: Power Line Communication) via the aggregation line 5. The PCS 8 and the determination device 101 transmit and receive measurement information by, for example, communicating using a LAN (Local Area Network).

[Monitoring device configuration]
FIG. 6 is a diagram showing a configuration of a monitoring device in the determination system according to the embodiment of the present disclosure. In FIG. 6, the inside of the junction box 76 is shown in more detail.

With reference to FIG. 6, the junction box 76 includes an aggregation unit 91, an output line 1, an aggregation line 5, and a copper bar 77.

Each of the output lines 1 includes a plus side output line 1p and a minus side output line 1n.

The aggregation line 5 includes a plus-side aggregation line 5p and a minus-side aggregation line 5n. The aggregation unit 91 includes the copper bar 77 and aggregates the output lines 1 from the plurality of power generation units 78. The copper bar 77 has a positive side copper bar 77p and a negative side copper bar 77n.

Although not shown, the copper bar 7 in the PCS 8 shown in FIG. 5 includes a plus side copper bar 7p and a minus side copper bar 7n corresponding to the plus side aggregation line 5p and the minus side aggregation line 5n, respectively.

More specifically, the positive output line 1p has a first end connected to the corresponding power generation unit 78 and a second end connected to the positive copper bar 77p.

The negative side output line 1n has a first end connected to the corresponding power generation unit 78 and a second end connected to the negative side copper bar 77n.

The positive-side aggregation line 5p has a first end connected to the positive-side copper bar 77p and a second end connected to the positive-side copper bar 7p in the PCS8. The negative side aggregation line 5n has a first end connected to the negative side copper bar 77n and a second end connected to the negative side copper bar 7n in the PCS8.

The monitoring device 111 includes an acquisition unit 11, a communication unit 14, a voltage sensor 17, a storage unit 18, and a measurement unit 19. The measuring unit 19 includes four current sensors 16. The monitoring device 111 may further include a large number or a small number of current sensors 16 depending on the number of output lines 1.

The monitoring device 111 is provided, for example, in the vicinity of the power generation unit 78. Specifically, the monitoring device 111 is provided inside, for example, a junction box 76 provided with a copper bar 77 to which the output line 1 to be measured is connected. The monitoring device 111 may be provided outside the junction box 76.

The monitoring device 111 is electrically connected to, for example, the plus side aggregation line 5p and the minus side aggregation line 5n via the plus side power supply line 26p and the minus side power supply line 26n, respectively. Hereinafter, each of the positive side power supply line 26p and the negative side power supply line 26n is also referred to as a power supply line 26.

The acquisition unit 11 acquires the measurement result of the current of the power generation unit 78. More specifically, the acquisition unit 11 acquires a measurement result indicating the current of the output line 1 measured by the current sensor 16.

Specifically, the current sensor 16 is, for example, a Hall element type current probe. The current sensor 16 is connected between the power generation unit 78 and the PCS8, and uses the power received from a power supply circuit (not shown) of the monitoring device 111 to draw a current flowing through the corresponding positive output line 1p, for example, at predetermined time intervals. The measurement is performed, and a signal indicating the measurement result is output to the acquisition unit 11. The current sensor 16 may measure the current flowing through the negative output line 1n.

The voltage sensor 17 measures the voltage of the output line 1 at predetermined time intervals, for example. More specifically, the voltage sensor 17 measures the voltage between the positive side copper bar 77p and the negative side copper bar 77n, and outputs a signal indicating the measurement result to the acquisition unit 11.

The acquisition unit 11 includes, for example, a measurement result included in each signal received from the current sensor 16 and the voltage sensor 17, an ID of the corresponding current sensor 16 and an ID of the voltage sensor 17, and a measurement including the time when the measurement result is acquired. The information is stored in the storage unit 18.

The measurement information is not limited to information including both the measurement result of the current sensor 16 and the measurement result of the voltage sensor 17, but is information that does not include either the measurement result of the current sensor 16 or the measurement result of the voltage sensor 17. You may.

The communication unit 14 can perform power line communication via the aggregation line with the PCS 8 shown in FIG. More specifically, the communication unit 14 can transmit and receive information by performing power line communication with the PCS 8 via the power supply line 26 and the aggregation line 5.

Specifically, the communication unit 14 acquires, for example, the latest measurement information stored in the storage unit 18 periodically or irregularly, and transmits the acquired measurement information to the PCS 8.

[Judgment target of judgment system]
FIG. 7 is a diagram showing the determination target of the determination system according to the embodiment of the present disclosure as a whole.

With reference to FIG. 7, the photovoltaic power generation system 401 includes a determination device 101, a plurality of PCS8s as a master unit, a plurality of junction boxes 76 as slave units, and a plurality of power generation units 78.

A plurality of power generation units 78 including a solar cell panel 79 are electrically connected to each PCS 8. More specifically, one or more junction boxes 76 are connected to each PCS8. One or more power generation units 78 are connected to each junction box 76. Each of the power generation units 78 has a plurality of solar cell panels 79. Further, as shown in FIG. 6, each of the junction boxes 76 is provided with a monitoring device 111.

FIG. 8 is a diagram showing a configuration of a determination device according to an embodiment of the present disclosure.

With reference to FIG. 8, the determination device 101 includes a measurement information acquisition unit 31, a storage unit 32, a determination unit 33, and a communication unit 34. The determination unit 33 is realized by a processor such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), for example. The communication unit 34 is realized by, for example, a communication circuit such as a communication IC (Integrated Circuit). The storage unit 32 is, for example, a non-volatile memory.

FIG. 9 is a diagram showing an example of a correspondence table stored in a storage unit in the determination device according to the embodiment of the present disclosure.

With reference to FIG. 9, the storage unit 32 includes a PCS 8 provided in the photovoltaic power generation system 401, a junction box 76 connected to each PCS 8, and a current sensor 16 and a voltage sensor provided in each junction box 76. A correspondence table T1 showing a correspondence relationship with 17 is stored.

Here, three PCS8a, PCS8b, and PCS8c will be typically described as PCS8. Under the control of PCS8a, connection boxes 76a1, 76a2, 76a3 are provided as connection boxes 76. Further, under the control of PCS8b, connection boxes 76b1, 76b2, 76b3 are provided as connection boxes 76. Further, under the PCS8c, connection boxes 76c1, 76c2, 76c3 are provided as connection boxes 76.

The correspondence table T1 indicates that the junction box 76a1 is provided with three current sensors 16 having IDs “Ia11”, “Ia12”, and “Ia13”, and a voltage sensor 17 having ID “Va1”, respectively. Similarly, the corresponding table T1 shows the ID of each of the plurality of current sensors 16 and the voltage sensors 17 provided in the other junction boxes 76.

With reference to FIG. 8 again, the measurement information acquisition unit 31 acquires measurement information including at least one of the current measurement result and the voltage measurement result of each power generation unit 78. The current and voltage of each power generation unit 78 are measured in the corresponding junction box 76, for example, as shown in FIG.

More specifically, the measurement information acquisition unit 31 receives the measurement information transmitted from the monitoring device 111 in each junction box 76 via the corresponding PCS8. Then, the measurement information acquisition unit 31 stores the measurement result of the current sensor 16 and the measurement result of the voltage sensor 17 indicated by the received measurement information in the storage unit 32.

Hereinafter, the measurement information transmitted from the monitoring device 111 in the junction box 76 is also referred to as “measurement information from the junction box 76”.

FIG. 10 is a diagram showing an example of each measurement result stored in the storage unit in the determination device according to the embodiment of the present disclosure.

With reference to FIG. 10, the storage unit 32 stores a measurement result log T2 which is a list of the measurement results of the current sensor 16 and the measurement results of the voltage sensor 17.

The measurement information acquisition unit 31 refers to the received measurement information and the correspondence table T1 shown in FIG. 8, for example, arranges the measurement results of each current sensor 16 and the measurement results of each voltage sensor 17 in chronological order, and arranges the measurement result log T2. Register with.

Specifically, the measurement information including the time t1 and the measurement results of the three current sensors 16 indicated by the measurement information from the junction box 76a1 are "5.0A", "5.3A", and "5.1A", respectively. , And the measurement result of the voltage sensor 17 is "500V". In this case, the measurement information acquisition unit 31 measures the measurement results of the current sensor 16 “5.0A”, “5.3A”, “5.1A”, and the voltage sensor 17 at the corresponding points in the measurement result log T2. Write "500V".

Further, the measurement information including the next time t2, and the measurement results of the three current sensors 16 indicated by the measurement information from the junction box 76a1, are "5.1A", "5.2A", and "5.2A", respectively. It is assumed that the measurement result of the voltage sensor 17 is "500V". In this case, the measurement information acquisition unit 31 places the measurement results of the current sensor 16 “5.1A”, “5.2A”, “5.2A”, and the measurement results of the voltage sensor 17 at the corresponding points in the measurement result log T2. Write "500V".

Similarly, after the next time t3, the measurement information acquisition unit 31 writes the measurement result of the current sensor 16 and the measurement result of the voltage sensor 17 in the corresponding points in the measurement result log T2.

Further, the measurement information acquisition unit 31 similarly applies the measurement result and voltage of the current sensor 16 to the corresponding points in the measurement result log T2 for the other junction boxes 76a2,76a3,76b1,76b2,76b3,76c1,76c2,76c3. Write the measurement result of the sensor 17.

(Relationship between PCS status and current measurement results and voltage measurement results)
(A) When the PCS is operating during the daytime FIG. 11 is a diagram showing an example of the measurement result of the current sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 11, the horizontal axis indicates time, and the vertical axis indicates the measurement result of the current sensor 16, that is, the current value.

With reference to FIG. 11, here, in a certain output line 1, no current flows until the time ta in the morning, and a current corresponding to the generated power in the corresponding power generation unit 78 flows from the time ta to the time tb in the evening. It is assumed that no current flows after time tb.

In this case, as shown in the graph Gi1, the current value is zero until the time ta, gradually increases after the time ta, and reaches the maximum value in the daytime time zone. After that, the current value gradually decreases and becomes a value near zero at time tb in the evening.

FIG. 12 is a diagram showing an example of measurement results of a voltage sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 12, the horizontal axis indicates time, and the vertical axis indicates the measurement result of the voltage sensor 17, that is, the voltage value.

With reference to FIG. 12, when the situation is similar to that of FIG. 11, the voltage value gradually increases to the PCS start-up starting voltage Vm until the time ta, as shown in the graph Gv1. After that, when a current flows through the output line 1 due to the activation of the PCS 8 at time ta, the voltage value drops below the PCS activation start voltage Vm and changes at a value near the optimum operating voltage at which the power generation amount of the solar cell panel 79 is maximized. do.

More specifically, assuming that the voltage value during PCS8 operation is the operating voltage Vp, the operating voltage Vp gradually increases after the time ta, reaches the maximum value in the daytime, and then gradually decreases. Then, when the operating voltage Vp drops to a predetermined value, the PCS 8 stops.

Further, when the PCS8 is stopped at the time tb, the voltage value rises again to the open circuit voltage Vo1 and then gradually falls. The open circuit voltage Vo1 at time tb in the evening is generally lower than the open circuit voltage at time ta in the morning, that is, the PCS start-up voltage Vm.

(B) When the PCS is stopped during the daytime FIG. 13 is a diagram showing another example of the measurement result of the current sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 13, the horizontal axis indicates time, and the vertical axis indicates the measurement result of the current sensor 16, that is, the current value.

With reference to FIG. 13, for example, it is assumed that a certain PCS8 is stopped at a time ct between the time ta and the time tb. In this case, as shown in the graph Gi2, the current value in the junction box 76 connected to the PCS8 gradually increases after the time ta and then becomes a value near zero at the time ct.

FIG. 14 is a diagram showing another example of the measurement result of the voltage sensor in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 14, the horizontal axis indicates time, and the vertical axis indicates the measurement result of the voltage sensor 17, that is, the voltage value.

With reference to FIG. 14, in the same situation as in FIG. 13, as shown in graph Gv2, the voltage value in the junction box 76 rises to the open circuit voltage Vo2 when PCS8 is stopped at time ct, and then gradually increases. Go down.

The open circuit voltage Vo2 at the time ct in the daytime is generally higher than the open circuit voltage Vo1 at the time tb in the evening shown in FIG. 12 because it has a value corresponding to the solar radiation or the like at the time ct. Hereinafter, each of the open circuit voltages Vo1 and Vo2 is also referred to as an open circuit voltage Vo.

As shown in FIGS. 11 to 14, the determination device 101 can determine the operating state of the PCS 8 based on at least one of the measurement result of the current sensor 16 and the measurement result of the voltage sensor 17. The operating state of the PCS 8 is, for example, an operating state or a stopped state.

(PCS judgment processing)
With reference to FIGS. 8 and 10 again, the determination unit 33 in the determination device 101 refers to the measurement result log T2 stored in the storage unit 32, and a plurality of measurement information acquired by the measurement information acquisition unit 31. Based on the above, a PCS determination process for determining the operating state of at least one of the plurality of PCS8s is performed.

More specifically, the determination unit 33 determines the operating state for each PCS 8 based on both the current measurement result and the voltage measurement result of each power generation unit 78 connected to the PCS 8.

(A) Specific Example of Voltage Determination Process The determination unit 33 performs a voltage determination process for determining an operating state for each PCS 8 based on the measurement results of the voltage sensor 17 in each junction box 76 connected to the PCS 8. Hereinafter, a specific example of the voltage determination process will be described.

(A-1) Specification of representative voltage value The determination unit 33 specifies the median value of the voltage measurement result of each power generation unit 78 connected to the PCS 8 for each PCS 8 with reference to the measurement result log T2. Hereinafter, the specified median value is also referred to as a “representative voltage value”.

Specifically, the determination unit 33 is a voltage value corresponding to the time t1, the voltage value “500V” of the junction box 76a1, the voltage value “505V” of the junction box 76a2, and the voltage value “503V” of the junction box 76a3. The median value of "503V" is specified as the representative voltage value at time t1 of PCS8a.

Further, the determination unit 33 is a voltage value corresponding to the time t1, and is the center of the voltage value “502V” of the junction box 76b1, the voltage value “501V” of the junction box 76b2, and the voltage value “504V” of the junction box 76b3. The value "502V" is specified as the representative voltage value at time t1 of PCS8b.

Further, the determination unit 33 is a voltage value corresponding to the time t1, and is the center of the voltage value “501V” of the junction box 76c1, the voltage value “505V” of the junction box 76c2, and the voltage value “504V” of the junction box 76c3. The value "504V" is specified as the representative voltage value at time t1 of PCS8c.

(A-2) Determination of PCS in Operating State The determination unit 33 specifies the minimum value (hereinafter, also referred to as “minimum voltage value”) of the representative voltage values of each PCS 8 at the same time. Then, the determination unit 33 determines the PCS8 corresponding to the specified minimum voltage value as the PCS8 in the operating state at the time.

Specifically, in the example shown in FIG. 10, the determination unit 33 specifies the representative voltage value “502V” of the PCS 8b as the minimum voltage value at time t1. In this case, the determination unit 33 determines the PCS8b as the PCS8 in the operating state at the time t1.

(A-3) Comparison of representative voltage values The determination unit 33 compares the representative voltage values of the specified PCS8s with each other, and determines the operating state of the plurality of PCS8s based on the comparison result.

More specifically, as shown in FIGS. 12 and 14, the voltage value of each power generation unit 78 connected to the PCS 8 in the stopped state rises to the vicinity of the open circuit voltage Vo, which is higher than the maximum value of the operating voltage Vp.

Therefore, the determination unit 33 calculates, for example, the difference between the representative voltage value and the minimum voltage value of each PCS8 at the same time, and confirms whether or not the calculated difference is equal to or greater than the voltage threshold value Thv. It can be determined whether or not each PCS 8 is in the stopped state. The voltage threshold value Thv is, for example, 40V and can be set on a monthly basis.

Specifically, during the determination period, the determination unit 33 refers to the measurement result log T2 and uses the latest voltage value in each junction box 76 to identify and operate the representative voltage value of each PCS 8 as described above. The PCS8 in the state is determined, and the representative voltage value and the minimum voltage value of each PCS8 are compared at predetermined time intervals.

The predetermined time interval is, for example, one minute. The determination period is, for example, a period from 60 minutes after the sunrise time to 60 minutes before the sunset time. The sunrise time and sunset time can be set, for example, on a monthly basis, such as 6:00 and 18:00, respectively.

For example, when the state in which the difference between the representative voltage value and the minimum voltage value is equal to or greater than the voltage threshold value Thv continues for a predetermined time or longer, the determination unit 33 determines that the PCS 8 corresponding to the representative voltage value is in the stopped state. The predetermined time is, for example, 10 minutes.

Specifically, in the example shown in FIG. 10, the difference “1V” between the representative voltage value “503V” of PCS8a and the minimum voltage value “502V” which is the representative voltage value of PCS8b at time t1 is the voltage threshold value Thv. Is less than.

Further, the difference “2V” between the representative voltage value “504V” of the PCS8c and the minimum voltage value “502V” which is the representative voltage value of the PCS8b at time t1 is less than the voltage threshold value Thv.

In this case, the determination unit 33 determines that the PCS 8a, 8b, and 8c are all in the operating state at time t1.

Further, at time t2, the representative voltage value of PCS8a is "503V", the representative voltage value of PCS8b is "562V", and the representative voltage value of PCS8c is "504V". In this case, the determination unit 33 determines the PCS8a as the PCS8 in the operating state at the time t2.

At time t2, the difference between the representative voltage value “504V” of the PCS8c and the minimum voltage value “503V” which is the representative voltage value of the PCS8a is “1V”, which is less than the voltage threshold value Thv. Therefore, the determination unit 33 determines that the PCS 8a and 8c are in the operating state at time t2.

On the other hand, at time t2, the difference between the representative voltage value “562V” of PCS8b and the minimum voltage value “503V” which is the representative voltage value of PCS8a is “59V”, which is equal to or higher than the voltage threshold value Thv. If the determination unit 33 continues such a state for a predetermined time after the time t2, the determination unit 33 determines that the PCS8b is in the stopped state in the period after the time t2.

The determination unit 33 is not limited to the configuration in which the median value of the voltage values in each junction box 76 connected to the PCS 8 is used as the representative voltage value. For example, the determination unit 33 may calculate the average value of the voltage values in each junction box 76 connected to the PCS 8 as a representative voltage value.

However, for example, when at least one of the plurality of junction boxes 76 connected to the same PCS8 has a defect, the average value of the voltage values in each junction box 76 is the connection in which the defect has occurred. It is affected by the voltage value in the box 76.

That is, in order to perform the voltage determination process without being greatly affected by the measurement result of the voltage value in the junction box 76 in which the defect has occurred, the median value of the voltage value in each junction box 76 connected to the PCS 8 is the representative voltage. The configuration with the value is preferable.

Further, the determination unit 33 is not limited to the configuration in which the representative voltage values of the PCS 8s are compared with each other in the voltage determination process, and the determination unit 33 performs a determination process in which the measurement result of the voltage of each power generation unit 78 in each PCS 8 is used by some other method. It may be configured to be performed.

(B) Specific Example of Current Determination Process The determination unit 33 performs a current determination process for determining an operating state for each PCS 8 based on the measurement result of the current of each power generation unit 78 connected to the PCS 8. Hereinafter, a specific example of the current determination process will be described.

(B-1) Calculation of current average value and specification of median current The determination unit 33 calculates the absolute value of the average value of the current values of each power generation unit 78 for each PCS 8 with reference to the measurement result log T2. And the absolute value of the median value of the current value of each power generation unit 78 is specified. The absolute value of the calculated average value is also referred to as "current average value" below. Further, the absolute value of the specified median value is also hereinafter referred to as "median current value".

The current value may become a negative value due to the backflow of the current in the output line 1. Therefore, the determination unit 33 calculates the absolute value of the average value as the current average value, and specifies the absolute value of the median value as the median current.

Specifically, the determination unit 33 is a current value at time t1 and corresponds to nine junction boxes 76a1,76a2,76a3,76b1,76b2,76b3,76c1,76c2,76c3 connected to the PCS8a, respectively. Nine current values "5.0A", "5.3A", "5.1A", "5.3A", "5.4A", "5.5A", "5.9A", "5.7A" , "5.5A", calculate the current average value and specify the current median value.

That is, the determination unit 33 calculates "5.41A" and "5.4A" as the average current value and the median current at time t1 of PCS8a, respectively.

Further, the determination unit 33 similarly calculates “5.16A” and “5.2A” as the current average value and the current median value at time t1 for PCS8b, respectively.

Further, the determination unit 33 similarly calculates “5.17A” and “5.1A” as the current average value and the current median value at time t1 for the PCS 8c, respectively.

(B-2) Comparison between the average current value and the first current threshold value, and comparison between the median current value and the second current threshold value.

As shown in FIGS. 11 and 13, the current value of each power generation unit 78 connected to the PCS 8 in the stopped state is a value near zero.

Therefore, the determination unit 33 can determine whether or not each PCS 8 is in the stopped state by checking, for example, whether or not the current average value of each PCS 8 is less than the first current threshold value Thi1. ..

Further, the determination unit 33 can determine whether or not each PCS 8 is in the stopped state by confirming, for example, whether or not the median current of each PCS 8 is less than the second current threshold value Thi2.

The first current threshold value Thi1 is, for example, "0.3A" and can be set on a monthly basis. The second current threshold value Thi2 is, for example, 0.5 A, and can be set on a monthly basis.

Specifically, the determination unit 33 calculates the current average value for each PCS 8 as described above by referring to the measurement result log T2 and using the latest current value in each junction box 76 during the determination period. The median current value is specified, the average current value is compared with the first current threshold value Thi1, and the median current value is compared with the second current threshold value Thi2 at predetermined time intervals. The predetermined time interval is, for example, one minute interval.

For example, when the current average value of a certain PCS8 is less than the first current threshold value Thi1 and the median current of the PCS8 is less than the second current threshold value Thi2 for a predetermined time or longer, the determination unit 33 determines the PCS8. Is determined to be in a stopped state. The predetermined time is, for example, 10 minutes.

Specifically, in the example shown in FIG. 10, the current average value “5.37A” of PCS8a and the current average value “5.16A” of PCS8c at time t2 are both equal to or higher than the first current threshold value Thi1. .. Further, the median current "5.4A" of PCS8a and the average current "5.1A" of PCS8c at time t2 are both equal to or higher than the second current threshold value Thi2.

On the other hand, the current average value “0.06A” of PCS8b at time t2 is less than the first current threshold value Thi1. Further, the current average value “0.1A” of PCS8b at time t2 is less than the second current threshold value Thi2.

If the determination unit 33 continues such a state for a predetermined time after the time t2, the determination unit 33 determines that the PCS8b is in the stopped state in the period after the time t2.

The determination unit 33 may be configured to perform either a comparison between the current average value and the first current threshold value Thi1 and a comparison between the median current value and the second current threshold value Thi2 in the current determination process. ..

However, for example, it is assumed that the current value in each power generation unit 78 is polarized because a part of the plurality of power generation units 78 provided under the same PCS8 is affected by the shadow.

In this case, the current value in the power generation unit 78 affected by the shadow may be specified as the median current of the PCS 8. That is, in this case, there is a high possibility that a more accurate determination result can be obtained by the determination using the current average value than by the determination using the median current value.

On the other hand, for example, in at least one of the plurality of junction boxes 76 connected to the same PCS8, a problem such as an offset deviation from the other current sensor 16 or a backflow of the output current may occur. ..

In this case, the current average value of the PCS 8 is affected by the current value in the junction box 76 in which the defect occurs. That is, in this case, there is a high possibility that a more accurate determination result can be obtained by the determination using the median current than the determination using the average current value.

Therefore, in the current determination process, the current determination process is performed with higher accuracy by performing both the comparison between the current average value and the first current threshold value Thi1 and the comparison between the median current value and the second current threshold value Thi2. be able to.

Further, the determination unit 33 is not limited to the configuration using the average value and the median value of the current measurement results of each power generation unit 78 in the current determination process, and may be configured to use a value other than the average value and the median value. good.

(C) Output of PCS determination result information If there is a PCS8 determined to be stopped in both the voltage determination process and the current determination process corresponding to the same time, the determination unit 33 is in the stopped state. The PCS determination result information indicating that the above is output to the communication unit 34.

In the above example, since the determination unit 33 determines that the PCS8b is in the stopped state at the time t2 in both the voltage determination process and the current determination process, the PCS determination result indicating that the PCS8b is in the stopped state at the time t2. The information is output to the communication unit 34.

On the other hand, when the result of the voltage determination process and the result of the current determination process do not match, the determination unit 33 does not create and output the PCS determination result information, for example.

The determination unit 33 may be configured to perform either the voltage determination process or the current determination process.

More specifically, when the current determination process is not performed, the determination unit 33 outputs the PCS determination result information indicating the PCS 8 determined to be in the stopped state in the voltage determination process to the communication unit 34. Further, when the voltage determination process is not performed, the determination unit 33 outputs the PCS determination result information indicating the PCS 8 determined to be in the stopped state in the current determination process to the communication unit 34.

However, as described above, in the voltage determination process, at least one of the plurality of PCS8s is determined to be the PCS8 in the operating state. Therefore, when all the PCS8s are in the stopped state, all the PCS8s are in the stopped state. Is erroneously determined to be in operation.

Therefore, for example, the administrator can select whether or not to set the state in which all PCS8s are stopped as the determination target.

More specifically, it is assumed that the administrator has selected not to determine the state in which all PCS8s are stopped. In this case, if there is a PCS8 that is a part of all the PCS8s and is determined to be in the stopped state in both the voltage determination process and the current determination process, the PCS8 is in the stopped state. PCS determination result information indicating that is created.

On the other hand, it is assumed that the administrator has selected the state in which all PCS8s are stopped as the determination target. In this case, the determination unit 33 does not perform the voltage determination process, and if there is a PCS8 determined to be in the stopped state in the current determination process, the determination unit 33 creates PCS determination result information indicating that the PCS8 is in the stopped state.

Further, the determination unit 33 creates PCS determination result information indicating that the PCS8 is in the stopped state when the PCS8 determined to be in the stopped state exists in either the voltage determination process or the current determination process. It may be. In this case, it is possible to perform both the voltage determination process and the current determination process while setting the state in which all the PCS 8s are stopped as the determination target.

Further, the determination unit 33 is not limited to the configuration in which the PCS determination processing is performed on all the PCS 8s provided in the photovoltaic power generation system 401, and the determination unit 33 is configured to perform the PCS determination processing on a part of one or a plurality of PCS8s. May be.

Further, the determination unit 33 determines the operating state of some of the PCS8s by the current determination process without performing the voltage determination process, and determines the operating state of some of the other PCS8s with respect to at least one of the other PCS8s. The operation state may be determined by the voltage determination process without performing the current determination process.

[Power generation unit judgment processing]
With reference to FIG. 8 again, the determination unit 33 in the determination device 101 further causes an abnormality in each power generation unit 78 based on the measurement result of the current sensor 16 indicated by the measurement information acquired by the measurement information acquisition unit 31. Performs a power generation unit determination process for determining whether or not it has occurred.

Here, as described above, the PCS 8 has a high impedance in the stopped state. Therefore, in the stopped state of the PCS 8, no current flows through the output line 1 electrically connected to the PCS 8.

However, in the stopped state of PCS8, for example, it is assumed that the output voltage of the power generation unit 78A among the four power generation units 78 shown in FIG. 4 is lowered due to factors such as shadow, dirt, parallel arc, ground fault, and initial failure. .. In this case, the output currents of the other three power generation units 78B, 78C, and 78D flow into the power generation unit 78A through the positive output line 1p.

At this time, the current sensor 16 corresponding to the power generation unit 78A measures a negative current value, that is, the current to the power generation unit 78A.

Therefore, the determination unit 33 determines that the circuit corresponding to the power generation unit 78A is abnormal when the current flows to the power generation unit 78A through the plus side output line 1p in the stopped state of the PCS8 corresponding to the power generation unit 78A. be able to.

For example, when the determination unit 33 determines that the PCS 8 is in the stopped state, the determination unit 33 confirms whether or not the measurement result of each of the plurality of current sensors 16 corresponding to the PCS 8 is less than the current threshold value Thi3. The current threshold Thi3 is zero or a negative value.

Then, when there is a current sensor 16 whose measurement result is less than the current threshold value Thi3, the determination unit 33 determines that an abnormality has occurred in the power generation unit 78 corresponding to the current sensor 16, and the power generation unit 33 has an abnormality. The power generation unit determination result information indicating 78 is output to the communication unit 34.

The determination device 101 may be configured not to perform the power generation unit determination process.

[Judgment result notification method]
Based on the PCS determination result information output from the determination unit 33, the communication unit 34 performs output processing for notifying the administrator or the like of one or a plurality of PCS 8s in the stopped state.

For example, the communication unit 34 displays the ID of the PCS8 in the stopped state, the stop start time, the stop end time, the length of the stop period, and the like on the monitor or sends them by e-mail. Further, the communication unit 34 may display in a display mode different from that of the PCS8 in the operating state, such as displaying the ID of the PCS8 in the stopped state brightly on the screen showing the arrangement of the plurality of PCS8s.

Further, the communication unit 34 performs an output process for notifying the administrator or the like of one or a plurality of power generation units 78 in which an abnormality has occurred, based on the power generation unit determination result information output from the determination unit 33.

For example, the communication unit 34 displays the ID of the power generation unit 78 in which the abnormality has occurred, the start time of the abnormality occurrence, and the like on a monitor or sends an e-mail. Further, the communication unit 34 displays in a display mode different from that of other power generation units 78, for example, on a screen showing the arrangement of a plurality of power generation units 78, the ID or the like of the power generation unit 78 in which an abnormality has occurred is displayed brightly. You may.

As a result, the administrator can grasp not only the operating state of the PCS8 but also the operating state of each power generation unit 78 provided under the PCS8 which is in the stopped state.

<Flow of operation>
Next, the operation procedure when the determination device 101 performs the PCS determination process and the power generation unit determination process will be described with reference to the drawings.

Each device in the determination system 301 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step in the following flowchart from the memory and executes the program. The programs of these plurality of devices can be installed from the outside. The programs of these plurality of devices are distributed in a state of being stored in a recording medium.

FIG. 15 is a flowchart defining an operation procedure when the determination device according to the embodiment of the present disclosure performs the PCS determination process and the power generation unit determination process.

With reference to FIGS. 8 and 15, first, each time the measurement information acquisition unit 31 in the determination device 101 receives the measurement information from each PCS8, the measurement result log shows the current value and the voltage value indicated by the received measurement information. Write to T2 (step S11).

Next, the determination unit 33 refers to the measurement result log T2 and specifies a representative voltage value, which is the median value of the measurement results of the voltage sensor 17 in each junction box 76 connected to the PCS8, for each PCS8 (step). S12).

Next, the determination unit 33 identifies the minimum voltage value, which is the minimum value among the representative voltage values of each PCS8 corresponding to the same time, and PCS8 corresponding to the specified minimum voltage value is in the operating state of the PCS8. (Step S13).

Next, the determination unit 33 calculates the difference between the representative voltage value and the minimum voltage value of each PCS8 corresponding to the same time, and confirms whether or not the calculated difference is equal to or greater than the voltage threshold value Thv. The operating state is determined for each PCS8 (step S14). The operation from step S12 to step S14 described above is the voltage determination process by the determination unit 33.

Next, the determination unit 33 refers to the measurement result log T2 and calculates the current average value of the measurement results of the current sensor 16 in each junction box 76 connected to the PCS 8 for each PCS 8. Further, the determination unit 33 refers to the measurement result log T2 and specifies the median current of the measurement result of the current sensor 16 in each junction box 76 connected to the PCS 8 for each PCS 8 (step S15).

Next, the determination unit 33 confirms whether or not the current average value of each PCS 8 is less than the first current threshold value Thi1 (step S16).

Next, the determination unit 33 confirms whether or not the median current of each PCS8 is less than the second current threshold value Thi2 (step S17).

Next, the determination unit 33 determines the operating state for each PCS 8 based on the comparison result between the current average value and the first current threshold value Thi1 and the comparison result between the median current value and the second current threshold value Thi2 (step). S18). The operation from step S15 to step S18 described above is the current determination process by the determination unit 33.

Next, the determination unit 33 determines whether or not to create the PCS determination result information based on the determination result of the voltage determination process and the determination result of the current determination process (step S19).

Next, the determination unit 33 determines to create PCS determination result information, for example, when there is a PCS8 determined to be in the stopped state in both the voltage determination process and the current determination process corresponding to the same time. ("YES" in step S19). Then, the determination unit 33 creates PCS determination result information indicating that the PCS 8 is in the stopped state, and outputs the created PCS determination result information to the communication unit 34 (step S20).

Next, the determination unit 33 performs a power generation unit determination process for determining whether or not an abnormality has occurred in each power generation unit 78 provided under the PCS 8 determined to be in the stopped state. Then, the determination unit 33 creates power generation unit determination result information indicating the result of the power generation unit determination process, and outputs the created power generation unit determination result information to the communication unit 34 (step S21).

Next, the communication unit 34 receives the PCS determination result information and the power generation unit determination result information output from the determination unit 33, and for example, by displaying the contents indicated by these information on a monitor or the like, the PCS determination process and Notify the administrator of the determination results of both of the power generation unit determination processes (step S22). Then, the determination device 101 repeats the operations after step S12.

On the other hand, the determination unit 33 determines not to create the PCS determination result information when, for example, there is no PCS8 determined to be in the stopped state in both the voltage determination process and the current determination process corresponding to the same time. (“NO” in step S19).

Then, the determination unit 33 does not create and output the PCS determination result information (step S20), the power generation unit determination process (step S21), and the determination result notification (step S22), and repeats the operations after step S12. ..

By the way, in a system capable of determining the state of a photovoltaic power generation system, a technique capable of realizing better functions is desired.

On the other hand, in the determination device 101 according to the embodiment of the present disclosure, the plurality of power generation units 78 including the solar cell panel 79 are electrically connected to the PCS 8. The measurement information acquisition unit 31 acquires measurement information including at least one of the current measurement result and the voltage measurement result of each power generation unit 78. The determination unit 33 performs a determination process for determining the operating state of at least one of the plurality of PCS 8s based on the plurality of measurement information acquired by the measurement information acquisition unit 31.

Further, the determination method according to the embodiment of the present disclosure is a determination method in the determination device 101 used in the photovoltaic power generation system 401 including a plurality of PCS8s. A plurality of power generation units 78 including the solar cell panel 79 are electrically connected to the PCS 8. In this determination method, first, the measurement information acquisition unit 31 acquires measurement information including at least one of the current measurement result and the voltage measurement result of each power generation unit 78. Next, the determination unit 33 determines the operating state of at least one of the plurality of PCS8s based on the acquired plurality of measurement information.

Here, in a large-scale power plant or the like, while remote monitoring of the amount of electric power sold to the grid is performed, remote monitoring of the operating state of the PCS alone may not be performed. In such a power plant or the like, for example, when the amount of electric charge sold is not zero but small, it is difficult to determine whether the cause is a malfunction of the PCS or the weather.

On the other hand, since the operating state of the PCS 8 can be determined by the above configuration, it is possible to determine whether or not the PCS 8 is the cause, for example, when the amount of power sold is not zero but small. .. Further, by determining the operating state of the PCS8 alone, for example, the PCS8 in the stopped state can be specified.

Therefore, in the determination device 101 and the determination method according to the embodiment of the present disclosure, more excellent functions can be realized in the system capable of determining the state of the photovoltaic power generation system 401.

In addition, a part or all of the functions of the determination device 101 according to the embodiment of the present disclosure may be provided by cloud computing. That is, the determination device 101 according to the embodiment of the present disclosure may be configured by a plurality of cloud servers and the like.

It should be considered that the above embodiments are exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above description includes the features described below.
[Appendix 1]
It is a judgment device used in a photovoltaic power generation system equipped with multiple power conversion devices.
A plurality of power generation units including a solar cell panel are electrically connected to the power conversion device, and the power generation unit is electrically connected to the power conversion device.
An acquisition unit that acquires measurement information including at least one of a current measurement result and a voltage measurement result of each of the power generation units, and an acquisition unit.
A determination unit that performs determination processing for determining the operating state of at least one of the plurality of PCS8s based on the plurality of measurement information acquired by the acquisition unit is provided.
Further, when the power conversion device determined to be in the stopped state exists in the determination process, the determination unit further generates the power generation connected to the power conversion device in the stopped state based on the plurality of measurement information. A determination device that performs a power generation unit determination process for determining whether or not an abnormality has occurred for each unit.

1 Output line 4, 5 Aggregation line 3 Internal line 6 Cubicle 7 Copper bar 8 PCS (Power converter)
9 Power conversion unit 10 Transformer 11 Acquisition unit 14 Communication unit 16 Current sensor 17 Voltage sensor 18 Storage unit 19 Measurement unit 21 Collection unit 26 Power supply line 31 Measurement information acquisition unit 32 Storage unit 33 Judgment unit 34 Communication unit 60 Power collection unit 73 , 77 Copper bar 74 Solar cell unit 76 Junction box 78 Power generation unit 79 Solar cell panel 80 PCS unit 91 Aggregation unit 101 Judgment device 111 Monitoring device 301 Judgment system 401 Solar power generation system

Claims (6)

It is a judgment device used in a photovoltaic power generation system equipped with multiple power conversion devices.
A plurality of power generation units including a solar cell panel are electrically connected to the power conversion device, and the power generation unit is electrically connected to the power conversion device.
An acquisition unit that acquires measurement information including at least one of a current measurement result and a voltage measurement result of each of the power generation units, and an acquisition unit.
A determination unit that performs a determination process for determining an operating state of at least one of the plurality of power conversion devices based on the plurality of measurement information acquired by the acquisition unit is provided. Judgment device. In the determination process, the determination unit specifies a representative value of the measurement result of the voltage of each power generation unit connected to the power conversion device for at least any two of the plurality of power conversion devices. The determination device according to claim 1, wherein the representative values of the specified power conversion devices are compared with each other, and the operating state of the power conversion device for which the representative values are specified is determined based on the comparison result. Claim 1 or claim, wherein the determination unit performs the determination process based on the measurement result of the current of each power generation unit connected to at least one of the plurality of power conversion devices. Item 2. The determination device according to item 2. The determination device according to claim 3, wherein the determination unit performs the determination process based on the average value and the median value of the current measurement results of each power generation unit. The acquisition unit acquires the measurement information including both the current measurement result and the voltage measurement result of each power generation unit.
The determination unit performs the determination process based on both the current measurement result and the voltage measurement result of each power generation unit connected to at least one of the plurality of power conversion devices. The determination device according to any one of claims 1 to 4, which is performed. It is a judgment method in a judgment device used in a photovoltaic power generation system equipped with a plurality of power conversion devices.
A plurality of power generation units including a solar cell panel are electrically connected to the power conversion device, and the power generation unit is electrically connected to the power conversion device.
A step of acquiring measurement information including at least one of a current measurement result and a voltage measurement result of each power generation unit, and
A determination method including a step of determining an operating state of at least one of the plurality of power conversion devices based on the acquired plurality of measurement information.

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