JP6319681B2 - Solar panel monitoring device, solar power generation system, solar panel monitoring method, and program - Google Patents

Description

  The present invention relates to a solar panel monitoring device, a solar power generation system, a solar panel monitoring method, and a program.

  In recent years, large-scale solar power generation facilities have been constructed at various locations, and the power generation capacity per facility tends to increase. Thus, as the number of photovoltaic power generation facilities and their power generation capacity increase, the opportunity to confirm the output status of the solar panels installed in the solar power generation facilities for inspection and other purposes increases. ing. Such an operation is performed by a procedure in which an engineer measures the output state (open circuit voltage) of each solar panel in turn using a measuring device in the field. There is a power generation facility that can generate a high voltage at the site, and the location may be high. For this reason, it is required to carry out measurement accurately while ensuring safety for work in the field.

  There is a technique for centrally managing the output state of each solar panel in a solar power generation facility (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-128070

By the way, solar power generation facilities are installed outdoors, and there are solar panels installed in specific areas due to the influence of surrounding conditions such as shadows of surrounding buildings and trees and clouds. Output may decrease. However, Patent Document 1 does not disclose knowledge for avoiding the influence of the decrease in the output of each solar panel, which may occur due to the influence of the surrounding conditions. Therefore, in the structure of patent document 1, when receiving said influence, the state of a solar panel cannot be determined correctly, and there exists a possibility of overdetecting that abnormality occurred in the solar panel.
As described above, in the configuration of Patent Document 1, since it is not possible to obtain a reliable determination result, it is necessary to perform a check operation using a measuring device in the field. As a result, even if it has the structure of patent document 1, there exists a problem that the frequency of the operation | work which measures on-site cannot be reduced and the output state of a solar panel cannot be measured safely.
In view of the above problems, an object of the present invention is to provide a solar panel monitoring device, a solar power generation system, a solar panel monitoring method, and a program that can safely measure the output state of an installed solar panel. It is to provide.

[1] The present invention has been made to solve the above-described problem, and the solar panel monitoring apparatus of the present invention detects a solar panel having a reduced power generation amount from a plurality of solar panels. A solar panel monitoring device that selects a plurality of solar cell panels arranged close to each other based on information specifying a position where the solar cell panel is arranged, and the solar panel generates power An electric line that sends power to the aggregation point is provided to correspond to the solar panel, and the magnitude of the voltage drop in the electric line corresponding to each of the plurality of solar panels selected by the selection unit is It depends power generation state of the solar panels, out of the solar panel based on at least a first pole and a threshold voltage defined below the voltage between the second pole of the set of poles of the aggregation point Comparing the first pole and the set of inter-terminal voltage of the second pole of the terminal, and a determination unit determining a power generation state of the plurality of photovoltaic panels selected by the selection unit, the plurality of solar panels , Each of the generated power is electrically connected in parallel at the aggregation point where the generated power is aggregated, and at least between the first pole of each output terminal of each solar panel and the first pole of the aggregation point A rectifying element is provided so as to be connected in series to each solar panel, and the determination unit determines that the solar panel when the terminal voltage of the output terminal of each solar panel is lower than the threshold voltage. It is a solar panel monitoring apparatus characterized by determining that is in an abnormal state .

[2] In the above solar panel monitor, the determination unit, at least the wire part of the section of the electric line which is provided between the front Symbol plurality of photovoltaic panels to the aggregation point The power generation state of each solar panel is determined by comparing the magnitude of the generated voltage drop between the plurality of solar panels selected by the selection unit.

[3] Further, in the solar panel monitoring apparatus, the selection unit selects the plurality of solar panels arranged to be adjacent to each other as a set.

[4] In the solar panel monitoring device, the solar panels selected as the set include a first solar panel and a second solar panel, and the determination unit includes: The first voltage drop generated by the electric line connecting the first solar panel and the aggregation point, and the second voltage generated by the electric line connecting the second solar panel and the aggregation point. The power generation state of the solar panel is determined based on the magnitude of the descent.

[5] In the solar panel monitoring apparatus, the determination unit may determine that a ratio between the magnitude of the first voltage drop and the magnitude of the second voltage drop does not reach a predetermined value. The plurality of selected solar panels are determined to include solar panels that cannot supply sufficient output power.

[6] In the solar panel monitoring device, the determination unit may be configured such that the output size of the selected solar panel exceeds a predetermined value that is predetermined according to the solar panel. , characterized in that the result of the determination of the power generation state of the solar panels with valid ones.

[7] The solar panel monitoring device further includes an input processing unit that detects a magnitude of a voltage drop in the electric line, and the determination unit is a magnitude of the voltage drop detected by the input processing unit. It is characterized by comparing based on.

[8] In the above solar panel monitor, the input processing unit detects the out magnitude of by that voltage drop wire path of the second pole is a ground side electrode of the electric line, the determination unit may compare, based on the magnitude of the by that voltage drop wire path of the second pole detected by the input processing unit.

[9] Further, in the solar panel monitoring apparatus, the electric wire path on which the input processing unit detects a voltage drop is configured by a conductor configured without providing a connection point in the middle of the section for detecting the voltage drop. It is characterized by being.

[10] Further, in the solar panel monitoring apparatus, the electric wire path on which the input processing unit detects a voltage drop is configured by a cable having no connection point in the middle of a section in which the voltage drop is detected. To do.

[11] Moreover, the photovoltaic power generation system of the present invention includes any one of the solar panel monitoring devices of the above invention.

[12] Moreover, the solar panel monitoring method of the present invention is a solar panel monitoring method for detecting a solar panel in which the amount of generated power is reduced among a plurality of solar panels, and the solar cell panel is arranged. Based on the information specifying the position, the process of selecting a plurality of solar panels arranged close to each other and the electric line that sends the power generated by the solar panel to the aggregation point correspond to the solar panel. provided on, depends power generation state of the voltage drop of magnitude the solar panels in the electric line corresponding to the plurality of solar panels that said selected at least a first pole of the aggregation point second comparing the first pole and the set of inter-terminal voltage of the second pole of the pole pair of the output terminals of the solar panel based voltage to the threshold voltage defined below between poles, a plurality of the selected Look including a step of determining the power state of the sun panel, further, the plurality of solar panels are electrically connected in parallel to each other in the-center of power generated respectively are aggregated, at least the respective solar A rectifying element is provided between the first pole of each output terminal of the panel and the first pole of the aggregation point so as to be connected in series to each of the solar panels, and the output terminal of each of the solar panels wherein when the inter-terminal voltage is lower than the threshold voltage of the solar panel is characterized in containing Mukoto the process determines that an abnormal state.

[13] Further, according to the program of the present invention, the plurality of solar panels are electrically connected to each other in parallel at the aggregation point where the generated power is aggregated, and at least the output terminals of the solar panels. A rectifying element is provided between the first pole and the first pole of the aggregation point so as to be connected in series to each of the solar panels, and the amount of generated power is reduced from among the plurality of solar panels. Selecting a plurality of solar cell panels arranged close to each other based on information identifying a position where the solar cell panel is arranged in a computer of a solar panel monitoring device that detects the solar panel wire path that transmits the power generated by the panel-center is provided so as to correspond to the solar panel, it a plurality of solar panels said selected Depends power generation state of the corresponding electric line voltage drop magnitude is the solar panels in, based on at least a first pole and a threshold voltage defined below the voltage between the second pole of the set of poles of the aggregation point Te comparing the first pole and the set of inter-terminal voltage of the second pole of the output terminals of the solar panel, comprising the steps of: determining the power state of the plurality of photovoltaic panels said selected of said respective solar panels And a step of determining that the solar panel is in an abnormal state when the terminal voltage of the output terminal is lower than the threshold voltage .

  According to the solar panel monitoring apparatus, the solar power generation system, the solar panel monitoring method, and the program of the present invention, the output state of the installed solar panel can be measured safely.

It is a block diagram which shows schematic structure of the solar energy power generation system which concerns on 1st Embodiment of this invention. It is a perspective view which shows the outline | summary of the solar energy power generation system in this embodiment. It is a flowchart which shows the procedure of the determination process of the solar panel by the solar panel monitoring apparatus in this embodiment. It is explanatory drawing explaining the detection of the solar panel which may have abnormality in this embodiment. It is a block diagram which shows the structure of the solar energy power generation system which concerns on 2nd Embodiment of this invention. It is explanatory drawing for demonstrating the determination method based on the voltage drop in this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]

(Schematic configuration of solar power generation system)
FIG. 1 is a configuration diagram showing a schematic configuration of the photovoltaic power generation system according to the first embodiment of the present invention. The figure shows the connection of each device in the form of a schematic single-line diagram.

  The solar power generation system 1 includes a solar power generation device 100, a high voltage panel 3, a power conditioner (PCS) 4, a DC aggregation box 5, branches 61, 62, 63, a solar panel monitoring device 200, and a terminal 300. Prepare.

The solar power generation device 100 includes solar power generation units 110, 120, and 130.
The solar power generation unit 110 includes a plurality of solar panels. A plurality of solar panels are indicated by solar panels (PVP) 111, 112, 113. Each solar panel includes a plurality of solar cells (cells) and is formed by connecting a plurality of solar cells (cells) in series. The solar panels formed in series in this way may be referred to as strings.
The solar power generation unit 120 includes a plurality of solar panels. A plurality of solar panels are indicated by solar panels (PVP) 121, 122, 123.
The solar power generation unit 130 includes a plurality of solar panels. A plurality of solar panels are indicated by solar panels (PVP) 131, 132, 133.

  Each of the solar panels is provided with a cable (electric wire path) for sending electric power generated by the solar panel so as to correspond to the solar panel. In the following description, each of the above solar panels has, for example, equivalent power generation performance.

The branch 61 is provided so as to correspond to the solar power generation unit 110, and each of the solar panels 111, 112, and 113 is connected thereto. The solar panels in the solar power generation unit 110 are connected in parallel to each other in the branch 61 via backflow preventing rectifier elements provided corresponding to the solar panels.
The branch 62 is provided so as to correspond to the solar power generation unit 120, and each of the solar panels 121, 122, and 123 is connected thereto. The solar panels in the solar power generation unit 120 are connected in parallel to each other in the branch 62 via backflow preventing rectifier elements provided corresponding to the solar panels.
The branch 63 is provided corresponding to the solar power generation unit 130, and the solar panels 131, 132, and 133 are connected to each other. The solar panels in the solar power generation unit 130 are connected in parallel to each other in the branch 63 via backflow preventing rectifier elements provided corresponding to the solar panels.
Each of the branches 61, 62, and 63 is connected to the DC aggregation box 5 via a cable.

The DC aggregation box 5 is provided so as to correspond to a power conditioner 4 described later, and branches 61, 62, 63 are connected via cables, and each photovoltaic power generation unit is connected via each branch. ing. Further, a power conditioner 4 is connected to the output side of the DC aggregation box 5.
The electric power from each photovoltaic power generation unit connected to the DC aggregation box 5 via each branch is aggregated in the DC aggregation box 5, and the aggregated power is supplied to the power conditioner 4.

Moreover, the power conditioner 4 controls each photovoltaic power generation unit, adjusts the electric power output from each photovoltaic power generation unit, converts the electric power supplied from each photovoltaic power generation unit, and outputs it.
The high voltage board 3 is connected to the commercial power system 2 and receives power from the commercial power system 2, and causes a part of the power converted by the power conditioner 4 to flow backward to the commercial power system 2.

The solar panel monitoring apparatus 200 detects a potential between two determined measurement points, performs a determination process based on the detected voltage, and outputs the detection result and / or the determination result. The solar panel monitoring apparatus 200 includes an input processing unit 210, an output processing unit 290, a storage unit 280, and a control unit 240.
The input processing unit 210 detects a voltage drop that occurs in a cable (electric line) provided between each solar panel and a branch corresponding to the solar panel. For example, a terminal on each solar panel side and a terminal provided on a branch corresponding to the solar panel are determined as voltage measurement points, and the input processing unit 210 calculates the potential difference between the two measurement points as described above. It is detected as a voltage drop.

  The storage unit 280 corresponds to the identification information for identifying the solar panel, the layout position information for specifying the position where the solar panel is disposed, the facility information such as the length and type information of the cable connecting from the solar panel to the branch. Add and remember. The length of the cable may be the length between the two measurement points. Furthermore, the storage unit 280 may be configured to store a detection result of the voltage drop detected by the input processing unit 210 and a determination result by the control unit 240 (determination unit 244) described later.

The control unit 240 includes the potential difference information based on the voltage drop detected by the input processing unit 210, the solar panel arrangement position information stored in the storage unit 280, and the cable facility connected from the solar panel to the branch. Based on the information, the power generation state of the solar panel is determined.
For example, the control unit 240 includes a selection unit 242 and a determination unit 244.
The selection unit 242 selects a plurality of solar cell panels arranged close to each other based on the arrangement position information that specifies the position where the solar cell panel is arranged.
The determination unit 244 generates power from the plurality of solar panels selected by the selection unit 242 based on the magnitude of the voltage drop in the cables (electric lines) respectively corresponding to the plurality of solar panels selected by the selection unit 242. A state is compared and the electric power generation state of each solar panel is determined.

The output processing unit 290 outputs the detection result detected by the control unit 240 and / or the determination result determined by the control unit 240. The output processing unit 290 may display the detection result and the determination result on a display unit provided in the output processing unit 290. Further, the output processing unit 290 may transmit the detection result and the determination result to an external device (such as the terminal 300) of the solar panel monitoring device 200 and display the same on the same device.
A terminal 300 is connected to the solar panel monitoring apparatus 200 via a communication path 500.
The terminal 300 receives and displays the detection result and / or determination result (alarm or the like) output from the solar panel monitoring apparatus 200, and records the detection result and / or determination result.

(Solar panel monitoring method)
With reference to FIG. 2, the outline | summary of the monitoring method of the solar panel in a solar power generation system (solar panel monitoring apparatus) is demonstrated. The figure is a perspective view showing an outline of a photovoltaic power generation system.
The figure shows a state in which the photovoltaic power generation units 110, 120, and 130 of the photovoltaic power generation system 1 are arranged. The photovoltaic power generation units 110, 120, and 130 are arranged along the X-axis direction and are arranged at a predetermined distance from each other in the Y-axis direction. For example, the solar panels 111, 112, and 113 in the solar power generation unit 110 are provided side by side in the direction along the X-axis direction. Similarly, in the solar power generation units 120 and 130, the respective solar panels are provided side by side in a direction along the X-axis direction.
Here, a situation is shown in which a tree 9 stands in a range that affects the solar power generation units 110, 120, and 130, and the shadow is applied to the solar power generation unit 110.

  When a failure such as a failure of a solar battery (cell) included in any solar panel in the solar power generation unit 110 occurs, the output (power generation amount) from the solar panel is reduced due to the failure. To do. Moreover, as shown in the figure, the photovoltaic power generation system 1 is provided outdoors, and the amount of power generation is affected by being covered by the shadows of trees and clouds. When the solar power generation system 1 is affected in this way, the output of a specific solar panel affected by a shadow of a tree or a cloud may be output even if the solar panel is not damaged. descend. Therefore, it is distinguished from the output information whether the decrease in the output of a specific solar panel is caused by a failure or caused by the influence of being covered by shadows of trees or clouds. That is not easy to implement.

Therefore, the solar power generation system 1 detects a solar panel whose output is reduced from among a plurality of solar panels by the following method.
The photovoltaic power generation system 1 is configured to compare the output states of a plurality of solar cell panels arranged close to each other based on information specifying the position where the solar cell panel is arranged. By doing so, the output state of the solar panel is determined while avoiding the influence of the environmental change as described above.
Furthermore, the power generation states of a plurality of solar panels arranged close to each other are compared based on the magnitude of the voltage drop in the cables (electric lines) respectively corresponding to the plurality of solar panels.
By the above monitoring method, it becomes possible to accurately determine the output state of the installed solar panel, thereby reducing over-detection when there is an abnormality in the output of the solar panel. Thus, the frequency of the operation | work which confirms the state of a solar panel on the spot when abnormality is detected can be reduced, and it becomes possible to measure the output state of the installed solar panel safely.

Next, with reference to FIG. 3, the procedure of the solar panel determination process by the solar panel monitoring apparatus 200 in the solar power generation system 1 will be described. This figure is a flowchart showing the procedure of solar panel determination processing by the solar panel monitoring apparatus 200.
The input processing unit 210 of the solar panel monitoring apparatus 200 is provided corresponding to each solar panel, and measures the voltage drop caused by the cable that sends the generated power by each solar panel, and stores the measurement result. 280 is stored. The magnitude of the voltage drop due to the cable is handled as information indicating the output level of the solar panel (step Sa10).
The selection unit 242 refers to the storage unit 280 and selects, as the solar panels to be compared, a plurality of solar cell panels arranged close to each other based on the arrangement position information specifying the position where the solar cell panel is arranged. (Step Sa20).

The determination unit 244 compares the voltage drop of the solar panel selected by the selection unit 242 (step Sa30), and determines whether there is a solar panel that is determined to be abnormal from the result of the comparison. (Step Sa40).
When there is a solar panel that is determined to be abnormal by the determination in step Sa40 (step Sa40: “Yes”), the determination unit 244 determines that all the solar panels that are determined to be abnormal in step Sa40. Thus, it is determined whether or not the determination result in step Sa40 is valid. For example, whether or not the determination result in step Sa40 is valid is determined based on a predetermined threshold value as to whether or not the voltage drop value exceeds the threshold value. For example, the threshold value is set to about half the voltage drop at the rated output of the solar panel (step Sa50).
When all the solar panels that have been determined to be abnormal by the determination in step Sa50 are determined to be effective for at least one solar panel based on the determination result (step Sa50: “effective”) The determination unit 244 issues an alarm in the output processing unit 290 (step Sa60), and the solar panel monitoring apparatus 200 ends the determination process.

On the other hand, when there is no solar panel determined by the determination in step Sa40 that there may be an abnormality (step Sa40: “None”), the solar panel monitoring apparatus 200 ends the determination process.
Moreover, when it determines with it being not effective about the result of determination of all the solar panels determined that there may be abnormality by determination in step Sa50 (step Sa50: "invalid"), the solar panel monitoring apparatus 200 performs a determination process. finish.
The solar panel monitoring apparatus 200 performs the solar panel determination process according to the above procedure.
Hereinafter, details of each of the above procedures will be described in order.

(Detection method for solar panels that may be abnormal)
Next, detection of a solar panel that may be abnormal will be described with reference to FIG. This figure is an explanatory view for explaining detection of a solar panel that may be abnormal.
First, FIG. 5A illustrates a method for determining the output state based only on the magnitude of the voltage drop.
As shown in FIG. 2A, the output states of the three solar panels, panels # 1, # 2, and # 3, are roughly divided into the following cases. The output state (output level) of the solar panel is indicated by the voltage drop value described above. The maximum value of the output level of the solar panel is set as the rated output of the solar panel, and in the following description, the value is “100”.
In addition, the threshold value used as a criterion (determination criterion) for determining whether there is an abnormality is determined as follows. For example, the threshold value used as the criterion is 80% of the voltage drop in the solar panel cable in the largest output state in the same unit.
In Case 1, all three solar panels can maintain an output level of 90 or more, and there is no solar panel that falls below the criterion. In this case, the output levels of all the solar panels are determined to be normal.
In case 2, the solar panel # 2 of the three solar panels has dropped to 70, and the other solar panels # 1 and # 3 maintain 92 output levels. In this case, only the solar panel # 2 is below the criterion, the output level of the solar panel # 2 is determined to be abnormal, and the output levels of the other solar panels # 1 and # 3 are normal. Determined.
In case 3, the solar panels # 1 and # 2 of the three solar panels are lowered to 72 and 70, and the solar panel # 3 maintains the output level of 92. In this case, the solar panels # 1 and # 2 are below the criterion, the output levels of the solar panels # 1 and # 2 are determined to be abnormal, and the output level of the solar panel # 3 is normal It is determined.
In Case 4, among the three solar panels, the # 2 and # 3 solar panels are reduced to 70 and 72, and the # 1 solar panel maintains 92 output levels. In this case, the solar panels # 2 and # 3 are below the criterion, the output levels of the solar panels # 2 and # 3 are determined to be abnormal, and the output level of the solar panel # 1 is normal It is determined.

Furthermore, examples of determination results under different conditions are shown. Cases 2A, 3A, and 4A show cases where the output level of the solar cell panel, which was 70 in cases 2, 3, and 4, was recovered to 78, respectively. A solar cell panel whose output level has recovered to 78 is determined to be normal, but a solar cell panel whose output level is still 72 is determined to be abnormal.
As shown above, the judgment method that simply determines the magnitude of the output level cannot distinguish between factors caused by a single failure and those caused by external influences. Even those caused by the above are judged as abnormal. For example, even when the output level decreases due to the shadows on two adjacent solar panels, both panels are determined to be abnormal. In the above-described determination method, it is necessary to set a threshold value that does not cause overdetection when the state is abnormal even to a normal state.

Next, FIG. 5B shows a determination method based on the arrangement position. Also in FIG. 8B, the output levels of the three solar panels are set to the same values as in the case of FIG. 9A so as to facilitate comparison with the above-described determination method.
A set of adjacent solar cell panels # 1 and # 2 and a set of solar cell panels # 2 and # 3 are selected based on information specifying the position where the solar cell panel is arranged. The ratio (ratio) of the output level magnitudes of the two solar cell panels in the selected set is calculated.
The case 1 will be described.
In the set of the # 1 and # 2 solar cell panels, the output level of the # 1 solar cell panel is 92, and the output level of the # 2 solar cell panel is 90. Here, the ratio of the output levels of the solar cell panel # 2 based on the output level of the solar cell panel # 1 is calculated. The calculation result is 98%.
In the set of the solar cell panels # 2 and # 3, the output level of the solar cell panel # 2 is 90, and the output level of the solar cell panel # 3 is 92. Here, the ratio of the output levels of the solar cell panel # 3 based on the output level of the solar cell panel # 2 is calculated. The calculation result is 102%.
The threshold value determined based on the ratio calculated as described above is set to 80%, for example, and the determination based on the ratio is performed. When the ratio is 80% or more of the threshold value, it is determined as normal, and when it is less than 80%, it is determined as abnormal. For example, the result determined by the combination of the solar cell panels of # 1 and # 2 is shown in the # 2 column of the determination result, and the result of determination by the combination of the solar cell panels of # 2 and # 3 is # Shown in column 3. In addition, since the solar cell panel of # 1 is used as a criterion for determination in the set of solar cell panels of # 1 and # 2, it cannot be obtained as the determination result of the solar cell panel of # 1. The column of # 1 of the determination result is set to “not yet”.

The results of performing the determination process according to the above procedure for each of cases 1, 2, 3, 4 and cases 2A, 3A, 4A are shown in the determination result columns.
Contrast with the result of FIG. 6A, it can be seen that the judgment when the output level is lowered side by side is less than the number of solar panels that are judged to be in an abnormally lowered state. Thus, the reliability of determination can be raised by reducing the case where it can determine with an abnormal state by said process.

  Hereinafter, a modified example of the determination process by the determination unit 244 will be described.

<First Modification of Determination Process>
Also in the result of the above determination processing, it is determined that the solar panel # 2 in Case 4 may be abnormal. In this case 4, the output levels of the solar panels # 2 and # 3 have been reduced, which may be due to external influences rather than the failure of the solar panels alone. .
The condition of case 4 is obtained by switching the output level values of # 1 and # 3 solar panels of case 3. From this, it is appropriate that the determination results of the solar panel # 2 in case 3 and case 4 are the same.
The difference between the above case 3 and case 4 is only that the relationship between the arrangement of numerical values and the direction in which the determination process is performed is reversed. Reversing the direction of the determination process with the numerical value of case 4 and starting the determination based on the solar panel # 3, the solar panel # 2 in case 4 is also determined to be normal. .
On the other hand, in case 2, even if the direction of the determination process is changed, it is determined as abnormal.
In the determination method of this modification, a process for increasing the reliability is added so that case 2 is determined to be abnormal and case 4 is determined to be normal. For example, in the determination process, a process of performing a determination process in the forward direction and the reverse direction and extracting only those determined as abnormal as a result of both determination processes as “abnormal” is added. Thus, by performing the determination process in the forward direction and the reverse direction, the procedure of the determination process increases, but the reliability of the determination result can be increased.

<Second Modification of Determination Process>
In the determination processing in the first embodiment and the first modification example, it has been described that the determination is based on the magnitude of the detected voltage drop, but the actually detected voltage drop value is the output level. Changes directly. Therefore, since the change in the output level is directly detected, it can be detected with high sensitivity. However, on the other hand, if the sensitivity is good and an abnormality is overdetected, the sensitivity can be reduced by the following processing.
For example, the value of the detected voltage drop is stored in the storage unit 280 as time series information, a moving average is taken over a predetermined time width, and a determination based on the arrangement position is performed using the result of the moving average. (Step S40).
In this way, the detected voltage drop value is treated as time-series information, a predetermined time width is moved in the time axis direction, and the moving average method of averaging the range information is used to generate a single shot. Even if detected at a specific time due to a change caused by a typical event, the detected values can be averaged to diminish the impact of the prominent event. On the other hand, since the change caused by the continuous event is continuously detected, the information on the continuous event can be detected even if the moving averaging process is performed. As a result, continuity events such as failures can be detected without leaking.

<Third Modification of Determination Process>
As shown in the second modification described above, an abnormality may be overdetected. In the second modified example described above, the moving voltage average of the voltage drop that is time-series information is determined before determining the magnitude of the voltage drop. However, after the magnitude of the voltage drop is determined, A case where the result of determination is determined to be abnormal for a predetermined number of times may be determined to be abnormal.

<Fourth Modification of Determination Process>
In any of the first embodiment and the first to fourth modifications, the # 1 solar panel is used as a criterion for determination, and therefore the # 1 solar panel itself cannot be determined. .
Therefore, when the above determination is performed on the solar panels in the same solar power generation unit, it is performed on the solar panels in different solar power generation units instead of the above determination. . Thus, by making the determination direction different from the determination in the same solar power generation unit, it is possible to determine a solar panel that could not be determined in the determination in the same solar power generation unit.

  As described above, in the first embodiment, the above modifications can be summarized.

  According to the above monitoring method, it is possible to accurately determine the output state of the installed solar panel, thereby reducing over-detection when there is an abnormality in the output of the solar panel. As a result, it is possible to reduce the frequency of the work of confirming the state of the solar panel at the site when an abnormality is detected, and to safely measure the output state of the installed solar panel.

[Second Embodiment]

  Next, a specific configuration of the photovoltaic power generation system will be described with reference to FIG. The figure is a block diagram showing the structure of the photovoltaic power generation system according to the second embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and the description of FIG. 1 is referred to. In addition, in the description of the figure, the description of a part of the configuration is omitted from FIG.

The present embodiment more specifically shows an example of the method for detecting the voltage drop of the cable in the first embodiment.
Here, the configuration of the photovoltaic power generation system 1A shown in FIG. In the following description, the case of negative electrode side grounding is illustrated.

First, the configuration of the power system from the solar power generation unit 110 to the PCS 4 will be described.
The solar panels of the solar power generation system 1 are provided with cables (electric cable paths) that send electric power generated by the respective solar panels so as to correspond to the solar panels.
For example, the solar panel 111 includes an output terminal TO1110. The output terminal TO1110 of the solar panel 111 is connected to a set of terminals TI611 among a plurality of sets of input side terminals provided in the branch 61, through a pair of cables 6111 and 6112, respectively. The cable 6111 is connected to the positive electrode side of the output terminal TO1110 corresponding to the positive electrode of the solar panel 111, and the cable 6112 is connected to the negative electrode side of the output terminal TO1110 corresponding to the negative electrode of the solar panel 111. The cable 6111 connected to the positive electrode side of the output terminal TO1110 is provided with a rectifying element 1111 for preventing backflow.

Similarly, the solar panel 112 includes an output terminal TO1120. The output terminal TO1120 of the solar panel 112 is connected to a set of terminals TI612 among a plurality of sets of input-side terminals included in the branch 61, via a pair of cables 6121 and 6122, respectively. The cable 6121 is connected to the positive electrode side of the output terminal TO1120 corresponding to the positive electrode of the solar panel 112, and the cable 6122 is connected to the negative electrode side of the output terminal TO1120 corresponding to the negative electrode of the solar panel 112. The cable 6121 connected to the positive electrode side of the output terminal TO1120 is provided with a rectifying element 1121 for preventing backflow.
Similarly, the solar panel 113 includes an output terminal TO1130. The output terminal TO1130 of the solar panel 113 is connected to a set of terminals TI613 among a plurality of sets of input terminals provided in the branch 61 via cables 6131 and 6132 forming a pair. The cable 6131 is connected to the positive electrode side of the output terminal TO1130 corresponding to the positive electrode of the solar panel 113, and the cable 6123 is connected to the negative electrode side of the output terminal TO1130 corresponding to the negative electrode of the solar panel 113. Note that a rectifying element 1131 for preventing a backflow is provided in the cable 6131 connected to the positive electrode side of the output terminal TO1130.

The branch 61 includes terminals TI 611, 612, and 613 that are a plurality of sets of input terminals, a terminal TO 610 that is a set of output terminals, and a terminal TC 619 that is a measurement terminal. The terminals TI611, 612, and 613 and the terminal TO610 are connected to each other in the branch 61, and the terminal 619 is branched from the negative electrode side.
As described above, the solar panels 111, 112, and 113 are connected to the terminals TI611, 612, and 613, respectively.

  The terminal TO610 of the branch 61 is connected to one set of terminals TI51 among a plurality of sets of input terminals provided in the DC aggregation box 5 via a pair of cables 511 and 512. The cable 511 is connected to the positive electrode side of the output terminal TO610, and the cable 512 is connected to the negative electrode side of the output terminal TO610.

The terminal TO50 of the DC aggregation box 5 is connected to a set of input-side terminals TI41 provided in the PCS 4 via a pair of cables 41 and 42. The cable 41 is connected to the positive side of the output terminal TO50, and the cable 42 is connected to the negative side of the output terminal TO50.
The terminal TI52 of the DC aggregation box 5 is connected to the branch 62, and the terminal TI53 is connected to the branch 63 in the same manner as the terminal TI51.

  The above is the configuration of the power system from the solar power generation unit 110 to the PCS 4. The configuration of the power system from the solar power generation units 120, 130 to PCS4 is the same as the configuration of the power system from the solar power generation units 110 to PCS4.

Next, the configuration of the measurement system will be described.
The negative terminal of the output terminal TO1110 of the solar panel 111 is connected to the input terminal 211 of the input processing unit 210 provided in the solar panel monitoring apparatus 200 via the cable 911.
The negative terminal of the output terminal TO1120 of the solar panel 112 is connected to the input terminal 212 of the input processing unit 210 included in the solar panel monitoring apparatus 200 via the cable 912.
The negative terminal of the output terminal TO1130 of the solar panel 113 is connected to the input terminal 213 of the input processing unit 210 included in the solar panel monitoring apparatus 200 via the cable 913.
The terminal TC 619 of the branch 61 is connected to the input terminal 261 of the input processing unit 210 provided in the solar panel monitoring apparatus 200 via the cable 615.

  In addition, although description is abbreviate | omitted, the solar panels 121-123 of the solar power generation unit 120 are respectively input to the input terminals 221-223 of the input process part 210 with which the solar panel monitoring apparatus 200 is provided similarly to said connection. The branch 62 is connected to the input terminal 262. Moreover, the solar panels 131 to 133 of the photovoltaic power generation unit 120 are connected to the input terminals 231 to 233 of the input processing unit 210 provided in the solar panel monitoring apparatus 200, respectively, and the branch 63 is connected to the input terminal 263. Has been.

(About cable impedance)
The length of the cable connecting the solar panel to the branch depends on the arrangement of each solar panel and the branch corresponding to the solar panel. Therefore, the information on the length of the cable connecting the solar panel to the branch and the type (model) of the cable is stored in the storage unit 280 as facility information (profile information) of the equipment, thereby using the facility information. can do. By using such facility information, the impedance per unit length is obtained from the cable type (model) information, and the impedance value of this cable is calculated by multiplying this impedance value by the cable length. It can be calculated.
In addition, you may set the length of the cable which connects a solar panel to a branch to the actual length at the time of construction. In addition, a predetermined length that takes a stepwise value for the length of the cable may be determined, and a length selected from the determined plurality of lengths may be selected for each cable.
As described above, by setting the length and type of the cable, the impedance of the cable from each solar panel to the branch can be easily calculated.

  Here, the calculated impedance value is Z0. In addition, the magnitude of the reference voltage drop is DV0, and the magnitude of the detected voltage drop is DVk. The magnitude of current flowing through the solar panel when the magnitude of the voltage drop is DVk can be expressed as (DVk / Z0) using the impedance Z0. In this way, the voltage drop and the solar panel output level can be associated with each other.

(Judgment method based on voltage drop)
A determination method based on the voltage drop will be described with reference to FIG. This figure is an explanatory diagram for explaining a determination method based on a voltage drop.
The figure shows the potential from three solar panels to a common branch in a level diagram. The direction of the arrow indicates the direction of current.
The horizontal axis indicates the cable length from the branch to the solar panel, and the vertical axis indicates the voltage. The origin O on the horizontal axis is defined as the position of the branch, and the positions of the solar panels are shown to the left of the origin O with respect to the origin O.

Here, when the negative side of the branch is set to the reference potential, it is assumed that the control voltage Vcont controlled by the PCS 4 is applied to the positive side of the branch. In order to simplify the description, the voltage drop from the PCS 4 to each branch is regarded as zero.
In addition, each solar panel can output the generated power at voltages of V111, V112, and V113, respectively.
The current flowing through each solar panel is determined by the relationship between the magnitude of the voltage output by each solar panel and the magnitude of the control voltage Vcont. The magnitude of the voltage drop in the cable is determined according to the magnitude of the current. In the case where each solar panel is capable of outputting with voltages of V111, V112, and V113, respectively, voltages between terminals of the rectifying elements for backflow prevention are indicated by V1111, V1121, and V1131. In this case, the voltage drops in the negative cable are indicated by V6112, V6122, and V6132, respectively, and the voltage drops in the positive cable are indicated by V6111, V6121, and V6131, respectively.

  In the same figure, each solar panel outputs the voltage of V111 and V112, respectively, and the voltage between terminals of the backflow prevention rectifier is V1111 and V1121 in the state where each backflow prevention rectifier is forward biased. become. If it is this state, an electric current will flow into a solar panel and it is in the state which can collect the electric power from a solar panel. In addition, the magnitude of the voltage drop of the negative cable when the solar panel outputs a relatively high output voltage V111 is DV111. On the other hand, the magnitude of the voltage drop of the negative side cable when the solar panel outputs a relatively low output voltage V112 is DV112. As shown in the figure, the voltage drop DV111 of the negative cable when the relatively high output voltage V111 is output is the voltage drop DV112 of the negative cable when the relatively low output voltage V112 is output. Become bigger. In this way, if the rectifying element for backflow prevention is in a forward-biased state, the magnitude of the current changes according to the magnitude of the voltage output from the solar panel, and the magnitude of the voltage drop in the cable is also the same. It changes according to change. Therefore, it is possible to determine the output state of the solar panel including variations by detecting and determining the magnitude of the voltage drop in the cable.

On the other hand, when the solar panel outputs a voltage of V113 and the rectifier for backflow prevention is reverse-biased, the voltage between the terminals of the rectifier for backflow prevention becomes V1113. In this state, no current flows through the solar panel, and power from the solar panel cannot be collected. In this way, if the rectifying element for backflow prevention is in a reverse-biased state, no current flows even if the magnitude of the voltage output from the solar panel changes, so no voltage drop occurs in the cable.
However, as described above, the rectifying elements for backflow prevention of other solar panels in the same solar power generation unit are forward-biased, and a sufficiently large output is obtained from the other solar panels. In such a situation, there is a possibility that the solar panel in a state where the rectifying element for backflow prevention is reverse-biased has some trouble. Therefore, in a situation where a sufficiently large output is obtained from another solar panel, even if the event is determined to be invalid in the determination in step S50 (FIG. 3), the voltage drop A threshold value is set in advance so as to detect that the value is a voltage near 0 volts, and the state of the solar panel that continuously outputs a voltage drop value that does not satisfy the threshold value is determined as an abnormal state. Also good.

In the present embodiment, as described above, the determination is made based on the value of the voltage drop of the negative side cable. In the photovoltaic power generation system 1A, since the negative electrode side is grounded to a common potential, the magnitude of the voltage drop of the negative electrode side cable is configured to be within a range of several volts (minus several volts) at most. Therefore, in the photovoltaic power generation system 1A, the potential at the location to be measured falls within the range of several volts (minus several volts) at most. Thus, 1 A of photovoltaic power generation systems can comprise a measurement system, without increasing the cable etc. which are charged with a high voltage for a measurement.
In addition, in the structure of this embodiment, you may comprise using a shield cable for the cable between each solar panel and each branch to the solar panel monitoring apparatus 200. FIG.

<First Modification of Second Embodiment>
In this embodiment, the arrangement of the measurement points is provided in each solar panel and each branch, but can be changed without being limited to the above. For example, as long as safety can be ensured, the voltage drop of the electric wire (cable or the like) on the positive electrode side may be measured instead of the cable on the ground side (negative electrode side). Moreover, in that case, you may set so that a cable may be included in the electric wire path of the positive electrode side. Further, a range including the backflow prevention element may be set.

<Second Modification of Second Embodiment>
In the present embodiment, the negative electrode side is the ground side, but the positive electrode side may be the ground side.

<Third Modification of Second Embodiment>
Although each terminal of each branch is assumed to be connected to the frame, each branch may be provided with a circuit breaker, and the circuit breaker may be provided between each terminal of the branch and the frame. In this case, 1 A of photovoltaic power generation systems can detect also when a circuit breaker will be in the state interrupted | blocked for a certain reason.

  According to the above monitoring method, it is possible to accurately determine the output state of the installed solar panel, thereby reducing over-detection when there is an abnormality in the output of the solar panel. As a result, it is possible to reduce the frequency of the work of confirming the state of the solar panel at the site when an abnormality is detected, and to safely measure the output state of the installed solar panel.

As mentioned above, although embodiment of this invention was described, in the said embodiment, the function of each process part in the photovoltaic power generation system 1 and 1A (solar panel monitoring apparatus) was implement | achieved by exclusive hardware. In addition, a program for realizing the function of each processing unit may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. May be realized.
That is, the solar panel monitoring apparatus 200 in the solar power generation systems 1 and 1A has a computer system inside. A series of processes related to the above-described process is stored in a computer-readable recording medium in the form of a program, and the above-described process is performed by the computer reading and executing this program. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program. The “computer system” here includes an OS and hardware such as peripheral devices.

  (1) And in the said embodiment, the solar panel monitoring apparatus 200 is the solar power generation system 1 which detects the solar panel from which the electric power generation amount fell out of several solar panels, Comprising: A selection unit 242 that selects a plurality of solar cell panels arranged close to each other on the basis of information for specifying the arranged position, and an electric line that sends electric power generated by the solar panel correspond to the solar panel. The power generation of the plurality of solar panels selected by the selection unit 242 based on the magnitude of the voltage drop in the electric line respectively corresponding to the plurality of solar panels selected by the selection unit 242 And a determination unit 244 for comparing states.

  In the solar panel monitoring apparatus 200 having such a configuration, a plurality of solar cell panels arranged close to each other are selected based on information specifying the position where the solar cell panel is arranged. Electric lines (cables or the like) for sending the electric power generated by the solar panel are provided so as to correspond to the solar panel, and electric lines (corresponding to the plurality of solar panels selected by the selection unit 242) ( The power generation states of the plurality of solar panels selected by the selection unit 242 are compared based on the magnitude of the voltage drop in the cable or the like.

  Thereby, the solar panel monitoring apparatus 200 was selected by the selection unit 242 based on the magnitude of the voltage drop in the electric line (cable etc.) respectively corresponding to the plurality of solar panels selected by the selection unit 242. The power generation states of a plurality of solar panels can be compared, and the output state of the installed solar panels can be measured safely.

  (2) Moreover, in the said embodiment, in the solar panel monitoring apparatus 200, the determination part 244 is provided with the aggregation point (branch) which collects the electric power which the some solar panel generated, and several sunlight The magnitude of the voltage drop that occurs in the electric wire in at least a part of the electric wire path provided between the panel and the aggregation point (branch) is compared between the plurality of solar panels selected by the selection unit 242. By doing so, the power generation state of each solar panel is determined.

  In the solar panel monitoring apparatus 200 having such a configuration, the magnitude of the voltage drop that occurs in the electric wires in at least a part of the electric wires provided between the plurality of solar panels and the aggregation point (branch). Is compared between the plurality of solar panels selected by the selection unit 242 to determine the power generation state of each solar panel.

  Thereby, the solar panel monitoring apparatus 200 compares the magnitude | size of the voltage drop which arises in the electric wire of the at least one area of said electric wire path between several solar panels selected by the selection part 242. Thus, the power generation state of each solar panel can be determined.

  (3) Moreover, in the said embodiment, the selection part 242 selects the several solar panel arrange | positioned so that it may mutually be located in a line as a group.

  In the solar panel monitoring apparatus 200 having such a configuration, each of the selected solar panels is selected by the selection unit 242 by selecting a plurality of solar panels arranged so as to be arranged next to each other. The power generation state can be determined.

  (4) Moreover, in the said embodiment, the 1st solar panel (solar panel 111) and the 2nd solar panel (solar panel 112) are contained in the solar panel selected as a group. The determination unit 244 determines the magnitude of the first voltage drop caused by the electric line (cable 6112) connecting the first solar panel (solar panel 111) and the aggregation point (branch 61), and the second The power generation state of the solar panel is determined on the basis of the magnitude of the second voltage drop caused by the electric line (cable 6122) connecting the solar panel (solar panel 112) and the aggregation point (branch 61).

  In the solar panel monitoring apparatus 200 having such a configuration, an electric wire that connects the first solar panel (solar panel 111) and the aggregation point (branch 61) included in the solar panel selected as a set. The magnitude of the first voltage drop caused by (cable 6112) and the second voltage drop caused by the electric line (cable 6122) connecting the second solar panel (solar panel 112) and the aggregation point (branch 61). The power generation state of the solar panel is determined based on the size of the solar panel.

  Thereby, in the solar panel monitoring apparatus 200, there are electric lines (cables 6112 and 6122) connecting each of the solar panels selected as a set and the aggregation point (branch 61), and each of which is generated by each electric line. The power generation state of the solar panel can be determined based on the magnitude of the voltage drop.

  (5) Further, in the above embodiment, the determination unit 244 selects the plurality of selected items when the ratio between the first voltage drop magnitude and the second voltage drop magnitude does not reach a predetermined value. It is determined that a solar panel that does not supply sufficient output power is included in the solar panel.

  The solar panel monitoring apparatus 200 having such a configuration has a plurality of selected solar cells when the ratio between the magnitude of the first voltage drop and the magnitude of the second voltage drop does not reach a predetermined value. It is determined that the light panel includes a solar panel that cannot supply sufficient output power.

  Thereby, in the solar panel monitoring apparatus 200, it determines with the solar panel which cannot supply sufficient output electric power being included from the ratio of the magnitude | size of a 1st voltage drop and the magnitude | size of a 2nd voltage drop. can do.

  (6) Moreover, in the said embodiment, the determination part 244 is a solar panel, when the magnitude | size of the output of the selected solar panel exceeds the predetermined value predetermined according to the said solar panel. The determination of the power generation state is considered to be an effective determination.

  As described above, the solar panel monitoring apparatus 200 can determine whether or not to enable the determination of the power generation state of the solar panel based on the magnitude of the output from the selected solar panel. By making such a determination, the determination of the power generation state of the solar panel is validated when the value exceeds a predetermined value according to the solar panel.

  Thereby, in the solar panel monitoring apparatus 200, it can determine with determination of the electric power generation state of a solar panel being effective by performing such determination.

  (7) Moreover, in the said embodiment, the solar panel monitoring apparatus 200 is provided with the input process part 210 which detects the magnitude | size of the voltage drop in the said electric wire path, and the determination part 244 was detected by the input process part 210. Comparison is made based on the magnitude of the voltage drop.

  In the solar panel monitoring apparatus 200 having such a configuration, the input processing unit 210 detects the magnitude of the voltage drop in the electric line.

  Thereby, in the solar panel monitoring apparatus 200, the determination part 244 can compare based on the magnitude | size of the said voltage drop detected by the input process part 210. FIG.

  (8) Moreover, in the said embodiment, as for the solar panel monitoring apparatus 200, the input process part 210 detects the magnitude | size of the voltage drop in the pole at the ground side of an electric wire path, and the determination part 244 is the input process part 210. Are compared based on the magnitude of the voltage drop at the grounded pole of the electrical line detected by

  In the solar panel monitoring apparatus 200 having such a configuration, the input processing unit 210 detects the magnitude of the voltage drop at the ground-side pole of the electric line, and the determination unit 244 detects the above-described detection detected by the input processing unit 210. The comparison is based on the magnitude of the voltage drop at the grounded pole of the electrical line.

  Thereby, in the solar panel monitoring apparatus 200, the determination part 244 can be compared based on the magnitude | size of the voltage drop in the pole by the side of the earthing | grounding of an electric wire path.

  (9) Moreover, in the said embodiment, in the solar panel monitoring apparatus 200, the electric wire path which the input process part 210 detects a voltage drop was comprised without providing a connection point in the middle of the area which detects a voltage drop. It is constituted by a conductor.

  Thereby, in the solar panel monitoring apparatus 200, the input processing unit 210 configures the electric wire path for detecting the voltage drop with a conductor configured without providing a connection point in the middle of the section for detecting the voltage drop. The voltage drop can be compared by reducing the influence of the contact resistance.

  (10) Moreover, in the said embodiment, in the solar panel monitoring apparatus 200, the electric wire path which the input process part 210 detects a voltage drop was comprised without providing a connection point in the middle of the area which detects a voltage drop. Consists of cables.

  Thereby, in the solar panel monitoring apparatus 200, the input processing unit 210 configures the electric wire path for detecting the voltage drop with a cable configured without providing a connection point in the middle of the section for detecting the voltage drop. The voltage drop can be compared by reducing the influence of the contact resistance.

  As mentioned above, although embodiment of this invention was described, the solar power generation system 1 and the solar panel monitoring apparatus 200 are not limited only to the above-mentioned illustration example, In the range which does not deviate from the summary of this invention. Of course, various changes can be made.

For example, the number of units of all the photovoltaic power generation units in the photovoltaic power generation system 1 (solar panel monitoring device 200) is predetermined for each power generation facility according to the amount of power generation (generated power) required as the power generation facility. Therefore, the number of photovoltaic power generation units can be any number determined for each photovoltaic power generation system without being limited to the configuration shown in the figure.
Moreover, the number of the solar panels in each solar power generation unit can be predetermined for every solar power generation unit. Therefore, the number of solar panels can be any number determined for each photovoltaic power generation unit without being limited to the configuration shown in the figure.

  Further, each of the solar panels may not have the same power generation performance. If each of the solar panels does not have the same power generation performance, the power generation performance of the two (multiple) solar panels is standardized according to the rated performance of each, and the above implementation is performed based on the standardized results. It is advisable to perform processing of the form. By standardizing in this way, it becomes possible to detect the abnormality of each solar panel by comparing solar panels having different rated performances.

  In addition, individual solar panels may be affected by individual differences and installation conditions that occur in the manufacturing stage, and may not be handled strictly as being capable of exhibiting the same power generation performance. In such a case, for example, correction processing for the rated performance of each solar panel may be performed based on the power generation performance at a specific timing. Furthermore, when variation with respect to the rated performance of individual solar panels occurs due to the above correction, it is preferable to standardize and process according to the above-mentioned “comparison between solar panels having different rated performances”.

1, 1A ... solar power generation system,
100 ... Solar power generation device, 110, 120, 130 ... Solar power generation unit,
111, 112, 113 ... solar panels,
121, 122, 123 ... solar panels,
131, 132, 133 ... solar panels,
200 ... Solar panel monitoring device, 500 ... Communication path,
210 ... input processing unit, 280 ... storage unit, 290 ... output processing unit,
240 ... control unit, 242 ... selection unit, 244 ... determination unit,
300 ... terminal,
3 ... High pressure board, 4 ... Power conditioner (PCS),
5 ... DC aggregation box, 61, 62, 63 ... branch

Claims (13)

A solar panel monitoring device that detects a solar panel in which the amount of generated power is reduced from among a plurality of solar panels,
A selection unit that selects a plurality of solar cell panels arranged close to each other based on information for specifying a position where the solar cell panel is arranged,
An electric line that sends the electric power generated by the solar panel to the aggregation point is provided so as to correspond to the solar panel, and in the electric line corresponding to each of the plural solar panels selected by the selection unit Unlike the magnitude of the voltage drop by the power generation state of the solar panel, the solar panel based on at least a first pole and a threshold voltage defined below the voltage between the second pole of the set of poles of the aggregation point comparing the first pole and the set of inter-terminal voltage of the second pole of the output terminal, and a determination unit determining a power generation state of the plurality of photovoltaic panels selected by the selection unit,
The plurality of solar panels are electrically connected in parallel to each other at the aggregation point where generated power is aggregated,
A rectifying element is provided so as to be connected to each solar panel in series between at least the first pole of each output terminal of each solar panel and the first pole of the aggregation point,
The determination unit
The solar panel monitoring apparatus , wherein when the voltage between the output terminals of each solar panel is lower than the threshold voltage, the solar panel is determined to be in an abnormal state . The determination unit
The magnitude of the IR drop that occurs in the wire of at least some sections of said conductive line provided between the front Symbol plurality of photovoltaic panels to the aggregation point, several selected by the selection unit The solar panel monitoring apparatus according to claim 1, wherein a power generation state of each solar panel is determined by comparing the solar panels with each other. The selection unit includes:
The solar panel monitoring device according to claim 2, wherein the plurality of solar panels arranged so as to be arranged next to each other are selected as a set. The solar panels selected as the set include a first solar panel and a second solar panel,
The determination unit
The magnitude of the first voltage drop caused by the electric line connecting the first solar panel and the aggregation point, and the second voltage drop caused by the electric line connecting the second solar panel and the aggregation point. The solar panel monitoring apparatus according to claim 3, wherein the power generation state of the solar panel is determined based on the size of the solar panel. The determination unit
When the ratio between the magnitude of the first voltage drop and the magnitude of the second voltage drop does not reach a predetermined value, sufficient output power is supplied to the selected plurality of solar panels. It determines with the solar panel which is not made being included. The solar panel monitoring apparatus of Claim 4 characterized by the above-mentioned. The determination unit
Magnitude of the output of the selected solar panels, when exceeding a predetermined value determined in advance according to the solar panels, those wherein a valid result of the determination of the power generation state of the solar panel and The solar panel monitoring device according to any one of claims 1 to 5, wherein: An input processing unit for detecting the magnitude of the voltage drop in the electric line;
The determination unit
The solar panel monitoring apparatus according to any one of claims 1 to 6, wherein a comparison is made based on the magnitude of the voltage drop detected by the input processing unit. The input processing unit
Detecting the out magnitude of by that voltage drop wire path of the second pole is a ground side electrode of the electric line,
The determination unit
Solar panels monitoring device as claimed in claim 7, characterized in that comparison based on the size of the by that voltage drop wire path of the second pole detected by the input processing unit. The electric wire path for detecting a voltage drop by the input processing unit is configured by a conductor configured without providing a connection point in the middle of a section for detecting the voltage drop. Solar panel monitoring device according to claim 1. The electric wire path for detecting a voltage drop by the input processing unit is configured by a cable having no connection point in the middle of a section for detecting the voltage drop. Solar panel monitoring device according to claim 1. A solar power generation system comprising the solar panel monitoring device according to any one of claims 1 to 10. A solar panel monitoring method for detecting a solar panel in which the amount of generated power is reduced from among a plurality of solar panels,
Selecting a plurality of solar cell panels arranged close to each other based on information identifying a position where the solar cell panel is arranged;
An electric line that sends the electric power generated by the solar panel to the aggregation point is provided so as to correspond to the solar panel, and a voltage drop of the electric line corresponding to each of the plurality of selected solar panels. depends power generation state of the solar panel size, the output terminal of the solar panel based on at least a first pole and a threshold voltage defined below the voltage between the second pole of the set of poles of the aggregation point comparing the first pole and the set of inter-terminal voltage of the second pole, seen including a step of determining the power state of the plurality of photovoltaic panels said selected
Furthermore, the plurality of solar panels are electrically connected in parallel with each other at the aggregation point where the generated power is aggregated,
A rectifying element is provided so as to be connected to each solar panel in series between at least the first pole of each output terminal of each solar panel and the first pole of the aggregation point,
A process of determining that the solar panel is in an abnormal state when the voltage between the output terminals of each solar panel is lower than the threshold voltage.
Solar panels monitoring method comprising including Mukoto a. The plurality of solar panels are electrically connected in parallel to each other at the aggregation point where generated electric power is aggregated, and at least the first pole of each output terminal of each of the solar panels and the first of the aggregation points. A solar panel monitor that detects a solar panel having a reduced power generation amount from the plurality of solar panels provided with a rectifying element so as to be connected in series to each of the solar panels between the poles To the computer of the device,
Selecting a plurality of solar cell panels arranged close to each other based on information identifying a position where the solar cell panel is arranged;
An electric line that sends the electric power generated by the solar panel to the aggregation point is provided so as to correspond to the solar panel, and a voltage drop of the electric line corresponding to each of the plurality of selected solar panels. The size differs depending on the power generation state of the solar panel, and the output terminal of the solar panel is based on a threshold voltage determined at least below the voltage between the first pole and the second pole of the aggregation point. a step of comparing the first pole and the set of inter-terminal voltage of the second pole, determining a power generation state of the plurality of photovoltaic panels said selected
A program for executing a step of determining that the solar panel is in an abnormal state when the voltage between the terminals of the output terminals of the solar panels is lower than the threshold voltage .

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