JP6320286B2 - Performance inspection device for photovoltaic power generation system - Google Patents

Description

  The present invention relates to a performance inspection apparatus and program in a photovoltaic power generation system.

  In recent years, solar power generation systems have become widespread, but on-site inspection of power generation performance on a string basis has become important due to the start of a system for purchasing a total amount of photovoltaic power generation and a long-term output guarantee system for modules by manufacturers. It was.

  Conventionally, as a method of inspection, for example, a changeover switch or the like is incorporated in advance in a photovoltaic power generation system, and at the time of inspection, a string to be measured is disconnected and the power of the remaining string is measured to detect a failure. A technique has been proposed (for example, Patent Document 1).

JP 2012-190947 A JP 2013-120803 A

However, conventionally, in order to detect a solar cell (group) with poor power generation performance, it is necessary to incorporate in advance a device such as a changeover switch and an inspection facility for wiring in the solar power generation system. there were. Moreover, since it is necessary to incorporate an apparatus etc., the cost of a solar power generation system will be caused to increase.
In addition, a general IV curve measurement as an on-site inspection method can measure with high accuracy, but has a problem that it takes much labor and time for an inspection worker. The method of measuring the operating current of each string with a DC clamp may be a simple measurement method compared to the IV curve measurement, but depending on the structure of the connection box, it may be difficult to clamp the string connection cable. In addition, there is a problem that zero adjustment and result recording are necessary for each measurement, and if there is a variation in solar radiation, it is difficult to make a relative comparison between strings and it is difficult to judge whether it is acceptable.

  An object of the present invention is to quickly and efficiently determine the quality of power generation performance of a unit power generation means that is a performance inspection execution unit without incorporating a device for performance inspection into a photovoltaic power generation system in advance.

The performance inspection apparatus in the solar power generation system according to the present invention includes a solar power generation unit having a plurality of unit power generation units serving as performance execution units, a power conditioner, and the unit power generation unit included in the solar power generation unit. A plurality of circuit breakers for connecting each of the unit power generation units are built in, and a plurality of wirings from the unit power generation units are collectively connected to the power conditioner. In a performance inspection apparatus in a photovoltaic power generation system having a connection box to be sent to all of the plurality of unit power generation means to the power conditioner via the connection box by turning on all the circuit breakers. When connected, the DC current measurement data output from the connection box is Only the unit power generation means is disconnected from the power conditioner by turning off only the circuit breaker that connects the first power collection means that collects the unit power generation means of the plurality of unit power generation means to the performance test target. A second collecting means for collecting DC current measurement data output from the connection box as unconnected state data, and the connected state data and unconnected state data with respect to the connected state data; A determination unit that determines whether the power generation performance of the unit power generation unit is good or not based on a ratio of the difference, and a sound output unit that outputs a sound periodically at a time interval that indicates on-off switching timing of the circuit breaker manually And .

  In addition, the first collecting means collects the data in the connected state and then collects the data in the non-connected state by the second collecting means, and then the unit power generating means to be performance-checked is connected again. When all of the plurality of unit power generation means are connected to the power conditioner via the connection box, DC current measurement data output from the connection box is collected as reconnection state data, and the determination The means calculates the average value of the connection state data and the reconnection state data as connection state data, and calculates the difference between the calculated average connection state data and non-connection state data with respect to the calculated connection state data. Based on the ratio, the power generation performance of the unit power generation means is determined.

The determination means displays measurement data collected by the first collection means and the second collection means.

  ADVANTAGE OF THE INVENTION According to this invention, the quality of the power generation performance of the unit power generation means used as the performance inspection implementation unit can be determined quickly and efficiently without incorporating in advance a device for performance inspection into the photovoltaic power generation system.

It is the block diagram which showed the solar energy power generation system containing one Embodiment of the performance inspection apparatus which concerns on this invention. It is a hardware block diagram of the computer which forms the data processor in this Embodiment. It is the figure which showed the direct current value collected by the direct current and voltage logger in this Embodiment in the graph format. The flowchart which showed the performance determination process which the data processor in this Embodiment implements It is the figure which showed an example of the data structure of the measurement data memorize | stored in the data storage part in this Embodiment. It is the figure which expanded a part of measurement data shown in FIG.

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

  FIG. 1 is a configuration diagram showing a photovoltaic power generation system including an embodiment of a performance inspection apparatus according to the present invention. FIG. 1 shows a solar cell array 1, a string 2, a connection box 3, a current collection box 4, a power conditioner 5, a solarimeter 6, a thermometer 7, a power receiving / transforming facility / in-house power distribution facility 8, a power company 9, and a data processing device. 10 and a DC current / voltage logger 40 are shown.

  The solar cell array 1 is a photovoltaic power generation means, and is an energy converter that absorbs the light energy of the sun and converts it directly into electricity, and has a plurality of strings 2. The string 2 is unit power generation means that is a performance inspection execution unit in the present embodiment. The string 2 is a unit of a solar cell, and is formed so that a plurality of (for example, 10 to 20) solar cell modules (solar panels) are wired in series to obtain a collective electric energy. It is the solar cell array 1 that gathers the strings 2 to obtain a sufficient output and is attached to a stand or the like installed on the rooftop.

  The power conditioner 5 is a device for converting the direct current electricity generated by the solar cell array 1 into alternating current when it is transmitted to the power receiving / transforming facility or the on-site power distribution facility 8 so that stable power can be supplied. The converted electricity is sold to the power company 9 depending on the amount of generated power.

  The connection box 3 is a device that collects the wires from the strings 2 included in the solar cell array 1 and connects them to the power conditioner 5, and sends the electricity individually generated by the strings 2 to the power conditioner 5. In the present embodiment, since a relatively large-scale photovoltaic power generation system having a plurality of solar cell arrays 1 is assumed, all the solar cell arrays 1 are connected using a plurality of connection boxes 3. It is composed. Since the configurations of the solar cell array 1 and the junction box 3 and their connection relations may be the same in all groups, only one group is shown in FIG. When there are a plurality of connection boxes 3 as in the present embodiment, the electricity (DC current) output from each connection box 3 is sent to the power conditioner 5 via the current collection box 4. . The connection box 3 includes a breaker (breaker) 34 that connects each of the strings 2, and the power transmission to the power conditioner 5 is controlled by turning the breaker 34 on and off. The breaker 34 is basically turned on / off manually, and in this embodiment, it is assumed that the manual type breaker 34 is used. However, a breaker 34 that can be automatically switched on / off is used. May be.

  The current collection box 4 is a device that collects wiring from the plurality of connection boxes 3 and connects them to the power conditioner 5, and sends the electricity sent from each connection box 3 to the power conditioner 5 together. The current collection box 4 incorporates a breaker (breaker) 44 for connecting each of the connection boxes 3, and power transmission to the power conditioner 5 is controlled by turning on / off the breaker 44. The breaker 44 may be a manual type or a type that can be automatically switched on / off. When a plurality of connection boxes 3 are required as in the present embodiment, they are used to collect wiring from the plurality of connection boxes 3. The current collection box 4 basically has the same function as the connection box 3.

  A direct current / voltage logger (hereinafter simply referred to as “logger”) 40, which is an electrical measuring means, measures the direct current at the connection position of the DC clamp 41 and the voltage at the connection position of the probe 42, and stores the measured data therein. Equipment. The logger 40 in the present embodiment is assumed to be a model that measures electricity every 0.5 seconds and records measurement data, but the data recording period is not necessarily limited to this. The logger 40 in the present embodiment also has a function of outputting measurement data to the outside. In the present embodiment, a conventional logger 40 may be used. However, since the logger 40 is carried to the vicinity of the current collection box 4, a device having excellent portability is preferable. In the present embodiment, it is sufficient that at least the direct current can be measured, but a model that can also measure the voltage is used so as to cope with the case of obtaining the power value.

  The data processing device 10 collects the measurement data accumulated in the logger 40 and performs a performance test on the string 2.

  FIG. 2 is a hardware configuration diagram of a computer forming the data processing apparatus 10 according to the present embodiment. It is assumed that the data processing apparatus 10 in the present embodiment is realized by a tablet terminal that is a portable device. The computer forming the tablet terminal can be realized by a general-purpose hardware configuration that has existed in the past. That is, the computer is configured by connecting the CPU 21, ROM 22, RAM 23, storage 24, touch panel 25 as user interface means, and network interface (IF) 26 provided as communication means to the internal bus 27 as shown in FIG. Is done.

  Returning to FIG. 1, the data processing apparatus 10 includes a data collection unit 11, a determination processing unit 12, an information providing unit 13, and a data storage unit 14. The data collection unit 11 is provided as a first collection unit and a second collection unit, collects a direct current value (measurement data) every 0.5 seconds measured and accumulated by the logger 40 and writes it to the data storage unit 14 save. The determination processing unit 12 is provided as a determination unit. As will be described in detail later, based on the ratio of the difference between the connected state data and the disconnected state data with respect to the connected state data, the power generation performance of the string 2 to be performance-checked Judge the quality. The information providing unit 13 provides information to an inspection worker or the like by displaying the determination result by the determination processing unit 12 on the touch panel 25.

  Each component 11 to 13 in the data processing device 10 is realized by a cooperative operation of a computer that forms the data processing device 10 and a program that operates on the CPU 21 mounted on the computer. Further, the data storage unit 14 is realized by a storage 24 mounted on the data processing apparatus 10. Alternatively, the RAM 23 or an external storage means may be used via a network.

  Further, the program used in this embodiment can be provided not only by communication means but also by storing it in a computer-readable recording medium such as a CD-ROM or USB memory. The program provided from the communication means or the recording medium is installed in the computer, and various processes are realized by the CPU 21 of the computer sequentially executing the program.

  Next, a procedure for performing the performance inspection of the string 2 in the present embodiment will be described. Since the order of the strings 2 to be performance-tested does not need to be determined in particular, in this embodiment, the performance-test targets are determined in ascending order of identification numbers. Further, a case where a tablet terminal is used as the data processing apparatus 10 will be described as an example.

  The inspection worker takes the tablet terminal 10 and the logger 40 and goes to the installation place of the photovoltaic power generation system to be subjected to the performance inspection. Then, the inspection worker connects the DC clamp 41 of the logger 40 to the connection box 3 side of one of the breakers 44 of the current collection box 4. That is, the solar cell array 1 including the string 2 to be inspected is connected to the connection box 3 at the tip of the wiring of the breaker 44 to which the DC clamp 41 is connected. The output direct current will be measured. In the present embodiment, the string 2 is used as a performance inspection execution unit, and any one of the strings 2 is a performance inspection target. However, when the DC clamp 41 is connected, the string 2 to be performance inspection is included. The solar cell array 1 and the connection box 3 connecting the solar cell array 1 are specified. In the following description, when “solar cell array 1” and “connection box 3” are referred to, among the plurality of solar cell arrays 1 and connection boxes 3 included in the photovoltaic power generation system, for convenience of explanation, unless otherwise specified, It shall refer to the solar cell array 1 and the junction box 3 specified as described above.

  The inspection worker also connects the probe 42 of the logger 40 to the position on the power conditioner 5 side where the wirings from the breakers 44 of the current collection box 4 are collected. Thereby, the voltage output from the current collection box 4 is measured.

  In the present embodiment, the logger 40 is installed so as to be attached to the current collection box 4. However, if the DC current is measured at the wiring portion between each connection box 3 and the current collection box 4, the DC clamp is used. 41 may be attached anywhere. Similarly, if the voltage measurement location is a wiring portion between the current collection box 4 and the power conditioner 5, the probe 42 may be attached anywhere.

  When the logger 40 is installed as described above and the DC clamp 41 and the probe 42 are connected to the predetermined positions of the wiring, the inspection worker performs a predetermined operation on the logger 40 and starts recording of direct current and voltage. Let Thereafter, the inspection worker moves to the installation position of the connection box 3 at the tip of the wiring to which the DC clamp 41 is connected.

  First, as an initial state, all the strings 2 included in the solar cell array 1 are connected to the power conditioner 5 through the connection box 3 and the current collection box 4. That is, the inspection worker turns on all the breakers 34 to which the string 2 is connected. The “on state (ON state)” means a state in which the breaker 34 corresponding to the string 2 is turned on so that the string 2 is connected to the power conditioner 5. Thereby, electricity from the string 2 is sent to the power conditioner 5. On the other hand, the “off state (OFF state)” means a state where the string 2 is disconnected from the power conditioner 5 by turning off the breaker 34 corresponding to the string 2. Thereby, electricity from the string 2 is not sent to the power conditioner 5. The breaker 44 in the current collection box 4 is always on.

  From the initial state described above, the inspection worker opens the lid of the connection box 3 and performs the following processing in order from the string 2 whose identification number is 1. For convenience, the string 2 having an identification number n (n = 1, 2,..., N, N is the number of strings 2 included in the solar cell array 1) will be referred to as an “nth string 2”. Then, the inspection worker turns off the breaker 34 corresponding to the first string 2 by turning it off. In this embodiment, it is turned off for 2 seconds. When 2 seconds have elapsed, the breaker 34 corresponding to the first string 2 is turned on to return to the on state. That is, all the strings 2 are turned on. When 2 seconds have passed since all the strings 2 are turned on, this time, the breaker 34 corresponding to the second string 2 is turned off to turn it off. When 2 seconds elapse, the breaker 34 corresponding to the second string 2 is turned on to return to the on state. Thereby, all the strings 2 are turned on. In this way, the inspection worker performs the switching operation of the breaker 34 in advance to alternately form the state in which all the strings 2 are in the on state for 2 seconds and the state in which any one of the strings 2 is in the off state. The process is repeated up to the Nth string 2 at a predetermined period.

  While the above switching operation is performed by the inspection worker, the logger 40 measures the direct current sent from one junction box 3. FIG. 3 shows the collected and accumulated data by this measurement. The measured data is shown in graph form. When the on / off state of each string 2 is switched at intervals of 2 seconds, the value of the direct current indicated by the measurement data at intervals of 2 seconds repeats up and down as illustrated in FIG. In FIG. 3, for example, a portion indicated by a is indicated by N when the first string 2 is in an off state, and a portion indicated by b is indicated by N when the second string 2 is in an off state. The portion is when the Nth string 2 is in the off state. In the present embodiment, when all the strings 2 included in the solar cell array 1 are connected to the power conditioner 5 via the connection box 3, the measurement data of the direct current output from the connection box 3 is obtained. It will be referred to as “connection state data”. In addition, when only the string 2 to be subjected to performance inspection is disconnected from the power conditioner 5 among the plurality of strings 2 included in the solar cell array 1, the measurement data of the direct current output from the connection box 3 is “not connected”. It will be referred to as “state data”. In FIG. 3, the portions indicated by a, b, and N in which the direct current value has decreased from the connection state data correspond to the non-connection state data.

  Since the logger 40 measures the direct current at intervals of 0.5 seconds, strictly speaking, the measurement data is indicated by dots at intervals of 0.5 seconds instead of continuous lines as shown in FIG. Become. Since each string 2 is turned on / off at intervals of 2 seconds, the measurement data shown in 2 seconds is composed of four dots. However, in FIG. 3, it has shown with the continuous line for convenience.

  When the work for one connection box 3 is completed in this way, the inspection worker connects the DC clamp 41 to the wiring to which the other connection box 3 that has not yet been inspected is connected, and is subject to performance inspection. The solar cell array 1 having the string 2 is switched. And it moves to the installation position of the connection box 3 to which the solar cell array 1 that is the switching destination is connected, and the connection box 3 is processed in the same manner as described above. Then, all the connection boxes 3 connected to the current collection box 4 are processed in the same manner as described above, so that all strings 2 included in the solar power generation system are finally turned off for 2 seconds. Measure the DC current at. When the above measurement data collection operation is completed, the inspection worker performs a predetermined operation on the logger 40 to stop the recording of the direct current and voltage.

  By the way, in this Embodiment, in order to collect the measurement data demonstrated above, the inspection worker needs to turn on / off the breaker 34 in order at intervals of 2 seconds. In order to cause the inspection worker to perform this on / off switching operation as accurately as possible, for example, some sound may be output from the tablet terminal 10 every 2 seconds. The inspection worker turns on / off the breaker 34 according to the sound.

  Next, the performance determination process performed by the data processing apparatus 10 in the present embodiment will be described using the flowchart shown in FIG.

  The inspection worker connects the logger 40 to the tablet terminal 10 by a wired connection or a wireless connection using a USB cable or the like. When the inspection operator designates a predetermined operation such as starting an application of the tablet terminal 10 or a measurement data capture period, the data collection unit 11 acquires the measurement data accumulated in the logger 40 and stores the data. Write to the unit 14 (step 101).

  FIG. 5 is a diagram showing an example of measurement data stored in the data storage unit 14 in the present embodiment. The measurement data is associated with the measurement time of the measurement data, the measurement current indicating the measurement data (DC current value), and the state information indicating the state of the string 2 when the measurement data is measured. Remembered. In the time information for measuring the measurement data, only the time is shown and the date is omitted.

By the way, as shown in FIG. 5, the inspection worker switches the on / off state by the inspection worker and the non-connection state data (a, b, N in FIG. 3) for one string included in the measurement data. It is necessary to associate the string 2 corresponding to the breaker 34 to be worked with one to one. As this method, pre-synchronization, sequential synchronization, and post-synchronization can be considered. The pre-synchronization is a method in which the time for turning off / on the breaker 34 and the current measurement time are determined in advance. However, measurement errors are likely to occur due to various timing fluctuation factors. In sequential synchronization, the breaker 34 is operated to instruct current measurement. In this case, it is necessary to measure and record after confirming the change and stability of the current value. Therefore, time and time required for measurement become great. In the post-synchronization, the measurement value corresponding to which string 2 is the measurement value at which time is determined by looking at the measurement result. That is, (the breaker 34 is turned off / on at a constant cycle. And, separately from the operation, the current is logged at a shorter cycle. These are matched later. In the post-synchronization, various timing fluctuation factors are absorbed. it can.
Therefore, post-synchronization is adopted in the present embodiment. Specifically, the determination processing unit 13 displays the measurement data stored in the data storage unit 14 on a predetermined setting screen on the touch panel 25 according to the operation of the inspector. The inspection worker refers to the measurement data on the setting screen, and first associates the portion with the first string 2 when the direct current value greatly decreases. The determination processing unit 13 sets an association between the current measured by the inspection worker and the string 2 in the data storage unit 14.

  In the present embodiment, whether the power generation performance of the string 2 is good or bad is determined based on the ratio of the difference between the connection state data and the non-connection state data with respect to the connection state data. FIG. 6 shows the procedure for calculating this ratio. It explains using.

  FIG. 6 is an enlarged view of a part of the measurement data shown in FIG. The measurement data included in the portion surrounded by the dashed-dotted ellipse 61 is the connection state data, and the measurement data included in the portion surrounded by the two-dot chain line ellipse 62 is the non-connection state data. Although clearly shown by enlargement, since the measurement data is collected at intervals of 0.5 seconds, four measurement data are obtained while the on / off state of the string 2 is switched at intervals of 2 seconds. In FIG. 6, in order to associate with FIG. 3, four measurement data collected when each string 2 is in the same state are illustrated as being connected by an auxiliary line.

  Here, focusing on the second string 2, the quality determination process of the performance of the string 2 will be described. According to the measurement data illustrated in FIG. 5, when the second string 2 is in the off state, that is, 10:43:04, 10:43:04, 5, 10:43:05, 0, and 10:43. The direct current is measured at the time of 05:05. In the present embodiment, the DC current value “42.647” measured at the third 10:43:05 of the DC current measured for 2 seconds is used when the string 2 is in the off state. Adopted as the measured value. For example, the DC current value when the string 2 is in the off state may be used as the average value by using all four measurement data. However, the first and fourth of the four measurement data are measured when the switching timing of the breaker 34 by the inspection worker is slightly shifted, and the second string 2 is not turned off but all the strings 2 are turned on. It is difficult to use because there is a possibility that it will be the data that was made. For this reason, the second measurement data may be adopted, but there is a possibility that the measurement value is not stable due to the effect of switching on / off. On the other hand, the third measurement data has been measured since the time has elapsed since the on / off switching, particularly in the middle of 2 seconds. For this reason, in the present embodiment, the third measurement data 64 is representatively used for the pass / fail judgment. Similarly, when the other strings 2 are in the off state and all the strings 2 are in the on state, the third measurement data 62, 63, and 65 are used.

  In the present embodiment, since the logger 40 that records direct current at intervals of 0.5 seconds is used and the breaker 34 is switched at intervals of 2 seconds, four measurement data are obtained in 2 seconds. For this reason, as described above, the third measurement data is representatively used for pass / fail judgment. However, measurement data other than the third may be adopted depending on the relationship between the recording interval of the logger 40 and the switching cycle of the breaker 34, or an average value using all or part of the plurality of measurement data, A median value or the like may be obtained and used as a measurement value of the string 2.

  First, the determination processing unit 12 calculates an average value of the measurement data (connection state data) collected when all the strings 2 sandwiching the second string 2 to be subjected to performance determination are in the on state (step 102). If the numerical example shown in FIG. 5 is used, measurement data when all the previous strings 2 are in the ON state (data at the time of connection state), specifically, 10:43 two seconds before 10:43:05. “47.119” when the minute is 03 seconds 0, and the measurement data when all the strings 2 immediately after are on (connection state data), specifically, 2 seconds after 10 hours 43 minutes 05 seconds 0 “46.735” at 10:43:07 seconds 0 is acquired, and this average value “46.927” is calculated. The average value of the measurement data (hereinafter referred to as “measurement data” for convenience) can be plotted as the measurement data 66 as shown in FIG. 6, and the measurement data 66 also corresponds to the data in the connected state. The measurement data 66 may be assumed to be measurement data collected when the second string 2 is not turned off at the time of collection of the measurement data 64.

  In the present embodiment, the measurement data 66 collected when the second string 2 is not turned off is obtained using the average value of the connection state data 62 and 63 sandwiching the string. However, although the accuracy may be slightly reduced, one of the immediately previous connection state data 62 or the immediately subsequent connection state data 63 may be used as the measurement data 66. Alternatively, the measurement data 66 may be calculated using three or more connection state data.

  Subsequently, the determination processing unit 12 calculates a difference D between the measurement data 66 and the measurement data 64 (step 103). Specifically, it is calculated as 46.927-42.647 = 4.28. That is, it is estimated that the direct current value decreased by 4.28 [A] by turning off the second string 2.

  Subsequently, the determination processing unit 12 calculates the ratio of the difference D with respect to the measurement data 66 (step 104). Specifically, it is calculated as 4.28 / 46.927≈0.0912. That is, it is estimated that the output current from the second string 2 occupies about 9.1% of the solar cell array 1 including the string 2.

  By the way, the measurement data shown in FIG. 5 shows a numerical example obtained from the solar cell array 1 having N = 11 strings 2. That is, 1 / N≈0.091, that is, about 9.1% of current is output per one. However, it is preferable to consider the margin because a slight error may occur due to sunlight, temperature, etc. For example, when 90% is considered as a margin, if the string 2 is normal, 9.1 in the solar cell array 1 is considered. It can be estimated that a current of% × 0.9≈8.2% is output. A DC current value (8.2%) to be output per normal string is set in advance as a determination reference value for determining pass / fail of string 2.

  After calculating the ratio of the difference D with respect to the measurement data 66, the determination processing unit 12 compares the ratio with the determination reference value to determine whether the performance of the string 2 is good or bad (step 105). In this example, since the ratio (ratio) of the output current from the entire solar cell array 1 to the output current from the second string 2 is 9.1%, it is equal to or more than the determination reference value. Therefore, the performance of the second string 2 is determined as “good”. The determination processing unit 12 determines pass / fail of each string 2 as described above.

  Note that the execution timing of the determination processing by the determination processing unit 12 may be executed every time measurement data of one connection box 3 is collected, or after measurement data from all the connection boxes 3 are collected. May be implemented.

  When the quality of each string is determined in the determination processing unit 12, the information providing unit 13 displays the determination result by the determination processing unit 12 on the touch panel 25 to notify the inspection worker or to system management via the network. Provide information by sending.

  In the present embodiment, the quality determination of each string 2 is performed as described above. If the string 2 is determined not to have a performance, a detailed inspection may be performed using a measuring instrument or the like in order to determine the cause of the determination. In the case of the present embodiment, since it is only necessary to perform a detailed performance inspection only on the string 2 that is determined not to have performance, the cost required for the performance inspection can be greatly reduced.

  In the present embodiment, the logger 40 having a measurement data recording interval of 0.5 seconds is used. Theoretically, it may be possible to set the switching interval of the on / off state of the string 2 to 0.5 seconds accordingly. However, in consideration of manual switching work by the inspection worker and the like, 2 seconds or more are necessary for the accuracy of the string 2 pass / fail judgment. Therefore, it is considered appropriate to set the switching interval of the on / off state of string 2 to 2 seconds. Thus, since measurement data can be collected in a short time, this embodiment is suitable for performance inspection in a relatively large-scale photovoltaic power generation system having a scale of 100 strings or more. In such a large-scale power plant, the number of strings connected to one power conditioner is large, so that the disturbance given to the operation of the power conditioner when one string is turned OFF and ON can be ignored.

  In the present embodiment, since the performance inspection of the string 2 is performed according to the ratio of the direct current, it is not necessary to measure the voltage. However, for example, when the pass / fail determination is performed using the power value The voltage can be measured and recorded together.

  In the present embodiment, the string 2 is used as an execution unit for performance inspection. However, depending on the connection form of the connection box 3 or the current collection box 4, the string 2 may be applied to the case where the performance inspection is performed in different units such as a solar cell module. May be.

  1 Solar cell array, 2 strings, 3 connection box, 4 current collection box, 5 power conditioner, 6 solarimeter, 7 thermometer, 8 power receiving / transforming facility / in-house power distribution facility, 9 electric power company, 10 data processing device (tablet terminal) , 11 Data collection unit, 12 Determination processing unit, 13 Information providing unit, 14 Data storage unit, 21 CPU, 22 ROM, 23 RAM, 24 Storage, 25 Touch panel, 26 Network interface (IF), 27 Internal bus, 34 44 breaker, 40 DC current / voltage logger, 41 DC clamp, 42 probe.

Claims (3)

Built-in solar power generation means having a plurality of unit power generation means to be a performance inspection unit, a power conditioner, and a plurality of circuit breakers connecting each of the unit power generation means included in the solar power generation means, A connection box that collectively connects a plurality of wires from the unit power generation means to the power conditioner, and collectively supplies electricity generated by the plurality of unit power generation means to the power conditioner, In inspection equipment,
By turning on all the circuit breakers, when all of the plurality of unit power generation means are connected to the power conditioner via the junction box, the DC current output from the junction box is measured. First collecting means for collecting data as data in a connected state;
When only the unit power generation means is disconnected from the power conditioner by turning off only the circuit breaker that connects the unit power generation means for performance inspection among the plurality of unit power generation means, the connection box Second collecting means for collecting DC current measurement data output from the non-connected state as data,
A determination unit that determines the quality of the power generation performance of the unit power generation unit based on a ratio of a difference between the connection state data and the non-connection state data with respect to the connection state data;
A sound output means for outputting a sound periodically at a time interval indicating a switching timing of turning on and off of the circuit breaker manually;
A performance inspection apparatus for a photovoltaic power generation system, comprising: The first collection means collects the connection state data and then collects the non-connection state data by the second collection means, and then reconnects the unit power generation means to be performance-checked to connect the plurality of data. When all of the unit power generation means are connected to the power conditioner through the connection box, DC current measurement data output from the connection box is collected as reconnection state data,
The determination means calculates an average value of the connection state data and the reconnection state data as connection state data, and calculates the calculated average connection state data and non-connection state data for the calculated connection state data. The performance inspection apparatus for a photovoltaic power generation system according to claim 1, wherein the power generation performance of the unit power generation means is determined based on a difference ratio.   2. The performance inspection apparatus for a photovoltaic power generation system according to claim 1, wherein the determination unit displays measurement data collected by the first collection unit and the second collection unit.

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