JP7330093B2 - Solar power generation facility management system and solar power generation facility management method - Google Patents

Description

The present invention relates to a photovoltaic power generation facility management system and a photovoltaic power generation facility management method for determining whether or not a plurality of photovoltaic power generation facilities distributed over a wide area are normal.

Until now, as a management system for photovoltaic power generation facilities, power generation data from multiple photovoltaic power generation facilities distributed over a wide area is collected, and based on the power generation data, it is determined whether each photovoltaic power generation facility is normal. It is known to do so (see Patent Literature 1).
More specifically, for example, when determining whether a specific photovoltaic power generation facility existing in a specific area is normal, the management system is based on sunshine hours data, solar altitude data, etc. in a specific area , the standard power generation amount in a specific area is calculated, and if the power generation amount of a specific solar power generation facility deviates greatly from the standard power generation amount, it is determined that the specific solar power generation facility is not normal.

JP 2006-174609 A

The technology disclosed in Patent Document 1 determines whether or not a specific photovoltaic power generation facility is normal based on the amount of power generated by the specific photovoltaic power generation facility at a predetermined time. There is a risk that fluctuations in the amount of power generated due to changes in sunshine hours due to changes in weather over time can greatly affect the determination of normality or abnormality, and development of new technology has been desired.

The present invention has been made in view of the above-mentioned problems, and its object is to determine whether or not the photovoltaic power generation equipment to be determined is normal even when there is a change in sunshine hours due to weather changes. It is an object of the present invention to provide a management system for a photovoltaic power generation facility and a method for managing the photovoltaic power generation facility capable of relatively accurate determination.

The management system for photovoltaic power generation facilities to achieve the above objectives is
A management system for determining whether or not a plurality of photovoltaic power generation facilities distributed over a wide area is normal, the characteristic configuration of which is as follows:
A power generation amount of the solar power generation facility to be determined among the plurality of solar power generation facilities in a specific time span at a plurality of times in a predetermined period, and among the plurality of solar power generation facilities excluding the determination target deriving a correlation coefficient from the amount of power generated in the specific time span at the plurality of times in the predetermined period of the solar power generation facility to be correlated, and directly using the correlation coefficient to determine the Equipped with a control device that determines abnormalities in the photovoltaic power generation equipment ,
When the correlation coefficient is equal to or greater than a predetermined abnormality determination threshold value at a past time point before the current time point and the correlation coefficient is less than the abnormality determination threshold value at the current time point, the control device determines whether the determination target is The point is that the first determination process is executed to determine that the photovoltaic power generation facility may be abnormal .

The management method of the photovoltaic power generation facility to achieve the above purpose is
A management method for determining whether or not a plurality of photovoltaic power generation facilities distributed over a wide area is normal, the characteristic configuration of which is as follows:
A power generation amount of the solar power generation facility to be determined among the plurality of solar power generation facilities in a specific time span at a plurality of times in a predetermined period, and among the plurality of solar power generation facilities excluding the determination target deriving a correlation coefficient from the amount of power generated in the specific time span at the plurality of times in the predetermined period of the solar power generation facility to be correlated, and directly using the correlation coefficient to determine the Judge the abnormality of the photovoltaic power generation equipment ,
When the correlation coefficient is equal to or greater than a predetermined abnormality determination threshold value at a past time point before the current time point, and the correlation coefficient is less than the abnormality determination threshold value at the current time point, the solar power generation facility to be determined. is to execute a first determination process for determining that there is a possibility that there is an abnormality .

According to the above characteristic configuration, the amount of power generated in a specific time period at a plurality of times in a predetermined period of the solar power generation facility to be determined, and the identification of the solar power generation facility to be correlated at a plurality of times in the predetermined period Since the abnormality of the solar power generation facility to be determined is determined by directly using the correlation coefficient derived from the amount of power generated in the time span, for example, there is a weather change that occurs over a wide area in a certain time span of a predetermined period. , even if the amount of power generation changes in a specific time span of a predetermined period, the amount of power generated by the solar power generation facility to be determined and the power generation amount of the solar power generation facility to be correlated derivation are approximately Since changes with the same tendency occur, the influence of weather changes occurring in the wide area on the correlation coefficient is sufficiently small.
As a result, according to the determination of the abnormality of the photovoltaic power generation equipment directly using the correlation coefficient described so far, it is possible to determine whether the photovoltaic power generation equipment is normal by directly using the amount of power generated in a specific time period. In comparison with the case of performing
In addition, according to the above characteristic configuration, since the abnormality of the photovoltaic power generation facility to be determined is determined by directly using the correlation coefficient, each correlation of the generated power amount of the specific time width at a plurality of times in the predetermined period Abnormality can be determined based on a value (correlation coefficient) that reflects the degree of failure. High anomaly judgment can be performed.
Since the solar panel of the photovoltaic power generation facility is a system without moving parts, it is known as a stable power generation system with few failures. Therefore, in the present invention, abnormality determination is performed on the premise that two or more of the plurality of photovoltaic power generation facilities do not fail at the same timing.

Since the amount of power generated by photovoltaic power generation facilities changes according to the amount of sunlight, the correlation coefficient between photovoltaic power generation facilities with different installation locations (e.g., longitude and latitude), installation directions, installation angles, etc. is low in advance. There is For example, a solar power generation facility installed facing southeast and a solar power generation facility facing southwest are in normal conditions because the hours of the day when they become sunny differ. Even then, the correlation coefficient may be low.
According to the above characteristic configuration, in the first determination process, the control device causes the correlation coefficient to be equal to or greater than a predetermined abnormality determination threshold value at a past time point before the current time point, and the correlation coefficient at the current time point to be less than the abnormality determination threshold value. , the current correlation coefficient of the solar power generation facility with a low correlation coefficient in the past is determined from the determination target by determining that there is a possibility that there is an abnormality in the solar power generation facility to be determined. It can be excluded, and the accuracy of determination can be further improved.
By the way, the correlation coefficient at the past point in time is the average of the correlation coefficient in the specific time span at the same time in the same month last year, the average of the correlation coefficient in the specific time span at the same time in the previous month, and the specific time in the previous day at the same time. A correlation coefficient or the like in width can be used.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device executes the first determination process for a plurality of the solar power generation facilities to be determined,
When a stop condition that at least three or more of the photovoltaic power generation facilities to be determined are likely to be abnormal is satisfied, a stop process is executed to stop determination of abnormality.

As described above, it is considered that the possibility that a plurality of photovoltaic power generation facilities are determined to be abnormal at the same time is sufficiently low due to reasons such as high system stability.
As in the above characteristic configuration, when it is determined in the first determination process that the stop condition that at least three or more of the photovoltaic power generation facilities subject to determination are likely to be abnormal is satisfied, there is a possibility of weather abnormality. By determining that and executing the stop processing of the abnormality determination, it is possible to improve the determination accuracy.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device is configured to be able to acquire weather information within the wide area from the outside,
When the weather information satisfies a stop condition that the weather information includes an abnormal weather within the wide area, a stop process is executed to stop determination of the abnormality.

When there is weather anomaly in a wide area, the derived correlation coefficient may be a low value even though the photovoltaic power generation facility to be determined is normal.
According to the above characteristic configuration, when the stop condition that the weather information includes a weather abnormality in a wide area is satisfied, by executing the stop processing for stopping the abnormality determination, the solar power generation equipment to be determined is normal. Therefore, it is possible to prevent the determination that there is an abnormality in spite of the above.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device is configured to be able to determine whether the system is in a power failure state,
The point is that, when the stop condition that the system is in the power failure state is satisfied, a stop process for stopping the determination of abnormality is executed.

When the system is in a blackout state due to a natural disaster such as a lightning strike, the photovoltaic power generation equipment is disconnected from the system, so normally the amount of power generated is zero. In addition, among photovoltaic power generation facilities that are self-sustaining and supply power to important loads, power generation and power supply will continue. Therefore, the active power that can be supplied is generally reduced.
According to the above characteristic configuration, when the stop condition that the system is in a power failure state is satisfied, by executing the stop processing for stopping the abnormality determination, the amount of power generated during the power failure may differ greatly from that during normal times. In addition, it is possible to prevent execution of inappropriate abnormality determination.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device is configured to be able to hold system voltage information regarding whether or not the system voltage is in a rising state in which the system voltage is equal to or higher than a predetermined threshold,
The control device is characterized in that, when a stop condition that the system voltage is in the system voltage rising state from the system voltage information is satisfied, the control device executes a stop process of stopping the abnormality determination.

For example, in locations where photovoltaic power generation facilities capable of supplying a large amount of generated power are interconnected to the grid, reverse power flow from the photovoltaic power generation facilities causes the system voltage to rise above the legal upper limit. In such cases, the system voltage rise suppression function of the power conditioner of the photovoltaic power generation facility works, and the amount of power generated is suppressed by the active power control of the photovoltaic power generation facility. If the abnormality determination according to the present invention is executed in the second stage, there is a risk that the determination will not properly reflect the current state of the photovoltaic power generation facility.
According to the above characteristic configuration, when the system voltage information satisfies the condition that the system voltage is in a rising system voltage state, the control device executes the stop process for stopping the abnormality determination. It is possible to prevent a judgment that does not appropriately reflect the current situation from being made.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device has a storage unit that stores over time the power generation amount of the specific time width at the plurality of times in the predetermined period of the plurality of solar power generation facilities distributed over a wide area,
The power generation amount stored in the storage unit while the stop processing is being executed is excluded from the derivation of the correlation coefficient.

According to the above characteristic configuration, the data of the generated power amount at the time when the stop process occurred is excluded from the data used as the basis for determining the abnormality, so that the generated power amount at the point in time past the present time is used. It is possible to improve the accuracy of judgment when judging abnormality of photovoltaic power generation equipment.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device, when determining an abnormality in one of the determination target solar power generation facilities, based on the correlation coefficient derived between two or more different correlation derivation target solar power generation facilities , the first determination process is executed, and when it is determined that there is a possibility of abnormality in a plurality of determination results of the first determination process, the possibility of abnormality in the solar power generation facility to be determined is high. The point is that a second determination process is executed to determine that

As in the above characteristic configuration, when it is determined that "there is a possibility of abnormality" according to the determination results of a plurality of first determination processes performed between two or more different correlation derivation target solar power generation facilities, By judging that the probability of the judgment result is high and that "the possibility of abnormality is high", the judgment result can be given reliability and presented.

A further characteristic configuration of the management system for photovoltaic power generation facilities is:
The control device is provided as at least one of a plurality of photovoltaic power generation facilities.

According to the above-described characteristic configuration, for example, by providing the above-described control device as a power conditioner of a photovoltaic power generation facility connected to a network line, the control device as the power conditioner can control, for example, a nearby photovoltaic power generation It periodically receives the amount of power generated from the facility, derives the correlation coefficient with the amount of power generated by its own solar power generation facility, and determines whether the solar power generation facility installed by itself is normal or not. It can be performed satisfactorily without providing a management server or the like.

As a further characteristic configuration of the management system for photovoltaic power generation equipment, the control device is provided separately from the photovoltaic power generation equipment, and is capable of receiving the amount of power generated by the photovoltaic power generation equipment via a communication line. It does not matter if it is configured.

1 is a schematic configuration diagram of a management system for photovoltaic power generation equipment according to an embodiment of the present invention; FIG. It is a control flow figure by the management system of this invention.

The management system 100 for the photovoltaic power generation facility PV according to the embodiment of the present invention and the management method thereof can determine whether the photovoltaic power generation facility to be determined is normal even when there is a change in sunshine hours due to climate change. It is related with the thing which can judge whether it is comparatively accurately.
A management system 100 for a photovoltaic power generation facility PV according to an embodiment and a management method thereof will be described below with reference to the drawings.

As shown in FIG. 1, in the management system 100 according to the embodiment, a plurality of (n in the embodiment) photovoltaic power generation facilities PV1 to PVn (n is an integer of 2 or more) distributed over a wide area A control device S capable of receiving each of the generated power amounts WPV1 to WPVn via a telecommunication line N is provided, and the control device S receives the generated power amounts WPV1 to WPVn. It determines whether or not the power generation facility PVm (m is an arbitrary integer less than or equal to n; not shown) is normal. The control device S is provided as a server realized by cooperation of commonly known hardware and software.
The photovoltaic power generation facility PVm to be determined is not fixed, but can be selected by the control device S from among the plurality of photovoltaic power generation facilities PV1 to PVn.

Since the photovoltaic power generation facilities PV1 to PVn have substantially the same configuration, the photovoltaic power generation facility PV1 will be described below as an example.
The photovoltaic power generation facility PV1 includes a plurality of (two in this embodiment) strings ST1a and ST1b in which a plurality of solar panels SP are connected in series, and the string ST1a is connected to a junction box CB1 via a backflow prevention diode D1a. , and the string ST1b is connected to the connection box CB1 via the backflow prevention diode D1b.
Although not shown, each solar panel SP is provided with a bypass diode. As a result, even if one of the solar panels SP is not generating power due to a change in sunshine conditions or the like, the strings ST1a and ST1b are able to maintain the output of the other solar panel SP if the other solar panel SP is generating power. is the output string.
The power lines connected by the junction box CB1 are connected to a power conditioner PCS1 having a function such as converting direct current to alternating current, and the power conditioner PCS1 is connected to a predetermined electric power load PL1 and the system K via the power line. , and is configured to be able to supply the generated power to the power load PL1 and the system K.

Incidentally, the rated output of each of the plurality of photovoltaic power generation facilities PV1 to PVn may be different, and the power generation performance and the number of solar panels SP provided in each of the plurality of photovoltaic power generation facilities PV1 to PVn are different. I don't mind.

Each of the power conditioners PCS1 to PCSn is configured to be able to measure the total power generated by the solar panels SP of the photovoltaic power generation facilities PV1 to PVn connected thereto (the amount of power generated per unit time (for example, one hour)). The total generated power is sequentially stored in a storage unit (not shown) provided therein over time.
The control device S is connected to the power conditioners PCS1 to PCSn through a telecommunication line N, and is configured to be able to sequentially receive the power generated over time stored in the storage units of the power conditioners PCS1 to PCSn. there is The control device S stores the received generated power in its own storage unit D with time for each of the power conditioners PCS1 to PCSn.

Here, an explanation will be added about whether the photovoltaic power generation facility PVm to be determined is "normal".
In general, the amount of power generated by a solar panel SP that constitutes a photovoltaic power generation facility PV is several times in 10 years regardless of whether the material is monocrystalline silicon, polycrystalline silicon, thin film amorphous silicon, or a compound semiconductor such as CIS or CIGS. It is known that the output drops by 10% or more, and in many cases, it drops by about 10%.
For this reason, in order to determine whether the photovoltaic power generation facility PV is "normal", there is a situation that it cannot be determined by comparing the predetermined fixed determination threshold value and the generated power amount.
Therefore, in the control device S, the following method is used to determine whether or not the photovoltaic power generation facility PVm to be determined is normal.

The control device S receives weather information from a weather server (not shown) via an electric communication line N, the amount of power generated by the plurality of photovoltaic power generation facilities PV1 to PVn that changes over time, and a plurality of sunlight A storage unit D that stores at least power failure information and system voltage information of the system to which the power generation facilities PV1 to PVn are connected, and processing conditions (determination threshold value, etc.) used for abnormality determination, and a solar power generation facility to be determined. A calculation unit S4 having a first determination processing unit S4a and a second determination processing unit S4b that determine abnormality of PV1 to PVn, and a stop processing unit S4c that executes stop processing when the first to fourth stop conditions are satisfied. ing.
Further, the control device S is connected to a display unit S3 such as a liquid crystal display for displaying the calculation result calculated by the calculation unit S4, and updates the processing conditions (determination threshold value, etc.) of the calculation unit S4. An operation unit S2 such as a keyboard and a mouse is connected to perform the operation.
The control device S controls the determination target photovoltaic power generation facility PVm among the plurality of photovoltaic power generation facilities PV1 to PVn for a predetermined period (for example, a period of 6 hours or more and 9 hours or less: main sunshine hours in a day) at a plurality of times. The amount of power generated in a specific time period (for example, 1 hour as a unit time: the time during which temporary fluctuations due to the influence of clouds, etc. can be leveled), and among the multiple photovoltaic power generation facilities PVn excluding the judgment target Correlation coefficient Rab (below [ Table 3]) is derived, and the abnormality of the photovoltaic power generation facility PVm to be determined is determined by directly using the correlation coefficient Rab.
Incidentally, the photovoltaic power generation facility PVm to be determined and the photovoltaic power generation facility PVk to be correlated derivation target can be appropriately selected from a plurality of photovoltaic power generation facilities PV1 to PVn by the control device S according to the control flow shown in FIG. Configured.

Here, the amount of power generated per unit time (for example, one hour) for each time (Ti: i = 1 to N: N is an arbitrary integer of 2 or more) of the photovoltaic power generation facility PVn is shown in [Table 1]. Assuming that the correlation coefficient Rab (a and b are arbitrary integers less than or equal to n) of the generated power amounts of the plurality of photovoltaic power generation facilities PV1 to PVn is shown in [Table 2], the correlation coefficient Rab A formula for deriving is represented by the following [Equation 1].

Abnormality determination control of the photovoltaic power generation facilities PV1 to PVn executed by the controller S will be described below based on the control flow of FIG.
The control device S receives weather information for a wide area where a plurality of photovoltaic power generation facilities PV1 to PVn are arranged from a weather server (not shown) via an electric communication line N, and stores the information in a storage unit D.
In addition, the control device S communicates the amount of power generated by the plurality of photovoltaic power generation facilities PV1 to PVn, which changes over time, from the power conditioners PCS1 to PCSn provided in the plurality of photovoltaic power generation facilities PV1 to PVn, respectively. While receiving through the line N, the power failure information and the system voltage information of the system K to which each of the plurality of photovoltaic power generation facilities PV1 to PVn are connected are received through the telecommunication line N, and the received various information is Stored in the storage unit D for each of the photovoltaic power generation facilities PV1 to PVn (#01).

If the weather information stored in the storage unit D satisfies the second stop condition that the weather information stored in the storage unit D includes a weather abnormality in a wide area (YES in #02), the stop processing unit S4c does not execute subsequent abnormality determination (abnormality is stopped), and the display section S3 displays "Unable to determine abnormality due to abnormal weather". On the other hand, if the second stop condition is not satisfied, the process proceeds to step #03.

The controller S selects and registers the photovoltaic power generation facility PVm to be judged from the plurality of photovoltaic power generation facilities PV1 to PVn (#03).

The stop processing unit S4c performs the operation when the third stop condition that the system is in a power failure state is satisfied at the connection point of the determination target photovoltaic power generation facility PVm to the system, or when the system is in a voltage rising state (for example, when the system voltage is If the fourth stop condition is satisfied (YES in #04), the selected determination target photovoltaic power generation facility PVm is subjected to subsequent abnormality determination processing. is registered in the storage unit D as a non-calculation target photovoltaic power generation facility that is not used as a determination target and a correlation derivation target (#05). After that, the control device S newly updates the determination target photovoltaic power generation facility PVm (#03). Note that the update of the selection is performed by sequentially selecting from among the plurality of photovoltaic power generation facilities PV1 to PVn without duplication.
On the other hand, if the third stop condition and the fourth stop condition are not satisfied (NO in #04), the process proceeds to step #06.

The control device S selects and registers the photovoltaic power generation facility PVk for correlation derivation from the plurality of photovoltaic power generation facilities PV1 to PVn (#06).

The stop processing unit S4c performs a third stop condition that the system is in a power outage state or a fourth stop condition that the system is in a voltage rising state at a connection point of the photovoltaic power generation facility PVk for which the correlation is to be derived to the system. If the stop condition is satisfied (YES in #07), the selected correlation derivation target photovoltaic power generation facility PVk is not used as a determination target and a correlation derivation target in the subsequent abnormality determination process. is registered in the storage unit D as (#08). After that, the control device S newly updates the determination target photovoltaic power generation facility PVk (#06). Note that the update of the selection is performed by sequentially selecting from among the plurality of photovoltaic power generation facilities PV1 to PVn without duplication.
On the other hand, if the third stop condition and the fourth stop condition are not satisfied (NO in #07), the process proceeds to step #09.

The first determination processing unit S4a determines the amount of power generated by the selected determination target photovoltaic power generation facility PVm at a plurality of times in a predetermined period, and the selected determination target photovoltaic power generation facility PVk. Deriving a correlation coefficient Rmk from the amount of power generated in a specific time span at a plurality of times in a predetermined period, and directly using the correlation coefficient Rmk to determine an abnormality in the photovoltaic power generation facility PVm to be determined First determination Processing is executed (#09).
For example, if the derived correlation coefficient Rmk is less than a preselected abnormality determination threshold value (for example, 0.3), the first determination processing unit S4a determines that there is a possibility that the solar power generation facility PVm to be determined is abnormal. Determine that there is.
In addition, when the determination accuracy is increased, the first determination processing unit S4a performs a past operation prior to the present time stored in the storage unit D with respect to the determination target photovoltaic power generation facility PVm and the correlation derivation target photovoltaic power generation facility PVk. When the correlation coefficient Rmk at the time point is equal to or greater than the abnormality determination threshold value and the correlation coefficient Rmk is less than the abnormality determination threshold value at the present time, even if it is determined that there is a possibility that the solar power generation facility to be determined is abnormal I do not care.
By the way, the correlation coefficient at the past point in time is the average of the correlation coefficient in the specific time span at the same time in the same month last year, the average of the correlation coefficient in the specific time span at the same time in the previous month, and the specific time in the previous day at the same time. A correlation coefficient or the like in width can be used.
The past power generation amounts of the photovoltaic power generation facilities PV1 to PVn stored over time in the storage unit D exclude the power generation amounts when the first to fourth stop conditions are satisfied. The first determination process based on the value of is not executed.

When the control device S has executed the first determination process for all of the correlation derivation target photovoltaic power generation facilities PVk other than the non-calculation target photovoltaic power generation facilities PVm that have been selected (YES in #10), Move to step #11, and if execution of the first determination process for all the correlation derivation target photovoltaic power generation facilities PVk other than non-calculation targets has not been completed (NO in #10), return to step #06 , update the photovoltaic power generation facility PVk for which the correlation is to be derived.

If YES in step #10, the second determination processing unit S4b performs a correlation coefficient derived between the determination target photovoltaic power generation facility PVm and two or more different correlation derivation target photovoltaic power generation facilities PVk. If it is determined that there is a possibility of abnormality in a plurality (two in this embodiment) of the determination results of the first determination process executed based on A second determination process is executed to determine that the probability is high.

Further, the control device S determines that the first determination process has been executed for at least three or more different determination target photovoltaic power generation facilities PVm so far, and that at least three or more determination target photovoltaic power generation facilities PVm are abnormal. It is determined whether or not the first stop condition that there is a possibility is satisfied, and if the first stop condition is satisfied (YES in #13), it is registered in the storage unit D as a weather abnormality (#12), and the first If the stop condition is not satisfied (No in #13), step #14 is executed.

In the case of YES in step #13, the control device S performs the first determination process and the second determination for all the correlation derivation target photovoltaic power generation facilities PVk other than the non-calculation targets for all the determination target photovoltaic power generation facilities PVm. It is determined whether or not the process has been performed, and if it has been performed (YES in #14), the process proceeds to step #15, and performs the first determination process and the If execution of the second determination process has not been completed (NO in #14), the process returns to step #03 to update the determination target photovoltaic power generation facility PVm.

Finally, the control device S displays the first determination process, the second determination process, the photovoltaic power generation facility registered as a non-calculation target, and whether or not there was a weather abnormality on the display unit S3, and terminates the abnormality determination control. do.

[Another embodiment]
(1) In the above embodiment, a configuration example is shown in which the stop processing is executed based on the first to fourth stop conditions. may be configured to execute any one or more.

(2) In the above embodiment, the management system 100 regarding the relatively large-scale photovoltaic power generation facilities PV1 to PVn has been described.
However, the management system of the present invention can also be applied to small-scale photovoltaic power generation facilities PV1 to PVn.
For example, each of the photovoltaic power generation facilities PV1 to PVn may be a single solar panel, and a power conditioner PCS capable of individually identifying a plurality of outputs of the solar panel may be configured to work as the control device S described so far. do not have.
With this configuration, it is possible to individually determine whether or not each solar panel itself is normal.

(3) An example has been shown in which the control device S is configured to be able to sequentially receive the amounts of generated power from the power conditioners PCS1 to PCSn provided in the plurality of photovoltaic power generation facilities PV1 to PVn.
However, the control device S adopts a configuration that receives the power generation amount at predetermined time intervals (for example, 0.5 second intervals for local aggregation, and 1 minute intervals for remote aggregation via a network line). I don't mind.

(4) In the above embodiment, the configuration example in which the control device S is provided as a server electrically connected to the plurality of photovoltaic power generation facilities PV1 to PVn via the electric communication line N is shown.
However, the control device S may be provided as a device (for example, a power conditioner) that constitutes at least one of the plurality of photovoltaic power generation facilities PV1 to PVn.

It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

The management system of the solar power generation facility and the management method of the solar power generation facility of the present invention can determine whether the target solar power generation facility is normal even if there is a change in the sunshine hours due to weather changes. The present invention can be effectively used as a management system for photovoltaic power generation equipment and a method for managing photovoltaic power generation equipment that can make determinations with relatively high accuracy.

100: Management system K: System N: Telecommunications line PVk: Photovoltaic power generation equipment PVm for correlation derivation: Photovoltaic power generation equipment Rab for determination: Correlation coefficient S: Control device S4a: First determination processing unit S4b: Second 2 determination processing unit S4c: stop processing unit WPV: power generation amount

Claims (10)

A management system for photovoltaic power generation equipment that determines whether or not a plurality of photovoltaic power generation equipment distributed over a wide area is normal,
A power generation amount of the solar power generation facility to be determined among the plurality of solar power generation facilities in a specific time span at a plurality of times in a predetermined period, and among the plurality of solar power generation facilities excluding the determination target deriving a correlation coefficient from the amount of power generated in the specific time span at the plurality of times in the predetermined period of the solar power generation facility to be correlated, and directly using the correlation coefficient to determine the Equipped with a control device that determines abnormalities in the photovoltaic power generation equipment ,
When the correlation coefficient is equal to or greater than a predetermined abnormality determination threshold value at a past time point before the current time point and the correlation coefficient is less than the abnormality determination threshold value at the current time point, the control device determines whether the determination target is A management system for a photovoltaic power generation facility that executes a first determination process for determining that the photovoltaic power generation facility may be abnormal . The control device is
The first determination process is executed for a plurality of the determination target photovoltaic power generation facilities,
The photovoltaic power generation facility according to claim 1, wherein, when a stop condition that at least three or more of the photovoltaic power generation facilities to be determined are likely to be abnormal is satisfied, a stop process is performed to stop determination of abnormality. management system. The control device is configured to be able to acquire weather information within the wide area from the outside,
3. The management system for photovoltaic power generation facilities according to claim 1 or 2, wherein, when a stop condition that said weather information includes a weather anomaly within said wide area is satisfied, a stop process for stopping judgment of anomaly is executed. The control device is configured to be able to determine whether the system is in a power failure state,
4. The management system for photovoltaic power generation equipment according to claim 1, wherein, when a stop condition that said system is in said blackout state is satisfied, a stop process for stopping abnormality determination is executed. The control device is configured to be able to hold system voltage information regarding whether or not the system voltage is in a rising state in which the system voltage is equal to or higher than a predetermined threshold,
5. The control device according to any one of claims 1 to 4, wherein, when the system voltage information satisfies a stop condition that the system voltage is in the system voltage rising state, the control device executes a stop process for stopping the abnormality determination. Management system of photovoltaic power generation equipment according to . The control device has a storage unit that stores over time the power generation amount of the specific time width at the plurality of times in the predetermined period of the plurality of solar power generation facilities distributed over a wide area,
The management of the photovoltaic power generation facility according to any one of claims 2 to 5, wherein the power generation amount stored in the storage unit when the stop process is being executed is excluded from derivation of the correlation coefficient. system. The control device is
When determining abnormality of one of the determination target photovoltaic power generation facilities, the first determination is performed based on the correlation coefficient derived between the two or more different correlation derivation target photovoltaic power generation facilities A second step of determining that there is a high possibility of abnormality in the photovoltaic power generation equipment to be determined when it is determined that there is a possibility of abnormality in a plurality of determination results of the first determination process. 3. The management system for photovoltaic power generation equipment according to claim 1 or 2, wherein the determination process is executed . The management system for photovoltaic power generation facilities according to any one of claims 1 to 7, wherein the control device is provided as equipment constituting at least one of the plurality of photovoltaic power generation facilities. 8. The control device according to any one of claims 1 to 7, wherein the control device is provided separately from the photovoltaic power generation equipment and is configured to be able to receive the power generation amount of the photovoltaic power generation equipment via a communication line. Management system of photovoltaic power generation equipment according to . A management method for determining whether a plurality of photovoltaic power generation facilities distributed over a wide area are normal,
A power generation amount of the solar power generation facility to be determined among the plurality of solar power generation facilities in a specific time span at a plurality of times in a predetermined period, and among the plurality of solar power generation facilities excluding the determination target deriving a correlation coefficient from the amount of power generated in the specific time span at the plurality of times in the predetermined period of the solar power generation facility to be correlated, and directly using the correlation coefficient to determine the Judge the abnormality of the photovoltaic power generation equipment,
When the correlation coefficient is equal to or greater than a predetermined abnormality determination threshold value at a past time point before the current time point, and the correlation coefficient is less than the abnormality determination threshold value at the current time point, the solar power generation facility to be determined. is likely to be abnormal.

Images