JP2013176224A - Power generation system with power generation unit creating electric power from renewable energy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a renewable energy generation system capable of monitoring a data transmission section that transmits monitoring data.SOLUTION: The generation system includes: a plurality of power generation units that create electric power from renewable energy; an electric power conversion section that converts electric power output from the plurality of power generation units; a first data transmission section that transmits monitoring data about the input side of the electric power conversion section; and a second data transmission section that transmits the monitoring data about the output side of the electric power conversion section. The first data transmission section and the second data transmission section monitor each other on whether or not they are damaged and announce damage to a monitoring apparatus.

Description

  The present invention relates to a power generation system including a power generation unit that generates electric power from renewable energy (hereinafter sometimes referred to as “renewable energy power generation system”).

  In recent years, with the increasing importance of protecting the global environment, expectations for renewable energy such as solar power generation have increased, and various renewable energy power generation systems have been actively introduced or planned.

JP 2011-198127 A (paragraph 0029, FIG. 2)

  Conventionally, a technique for monitoring a renewable energy power generation system has been proposed (see, for example, Patent Document 1). The photovoltaic power plant monitoring system proposed in Patent Document 1 includes a data transmission device that transmits data related to a 115 kV transformer, a data transmission device that transmits data related to a 22 kV transformer, and data related to an inverter device. The monitoring of the photovoltaic power generation plant is realized by providing one data transmission device for transmitting each.

  However, in the photovoltaic power generation plant monitoring system proposed in Patent Document 1, monitoring of each data transmission device has not been considered even though each data transmission device itself may fail.

  An object of this invention is to provide the renewable energy electric power generation system which can monitor the data transmission apparatus which transmits monitoring data in view of said situation.

  To achieve the above object, a power generation system according to the present invention includes a plurality of power generation units that generate power from renewable energy, a power conversion unit that converts power output from the plurality of power generation units, and the power conversion. A first data transmission unit for transmitting monitoring data related to the input side of the power supply unit, and a second data transmission unit for transmitting monitoring data related to the output side of the power conversion unit, the first data transmission unit and the A configuration is adopted in which the second data transmission unit monitors whether or not a failure has occurred and reports a failure of the monitoring device.

  In the power generation system configured as described above, the power supply voltage of the first data transmission unit may be an input voltage or an output voltage of the power conversion unit or a voltage obtained by converting the input voltage or the output voltage of the power conversion unit. Good.

  In the power generation system having any one of the above configurations, the power supply voltage of the second data transmission unit may be a voltage supplied from the outside of the power generation system or a voltage obtained by converting the output voltage of the power conversion unit. Good.

  Moreover, a solar power generation system can be mentioned as an example of the power generation system having any one of the above configurations.

  According to the power generation system of the present invention, it is possible to monitor a data transmission device that transmits monitoring data.

It is a figure which shows schematic structure of the solar energy power generation system which concerns on 1st Embodiment of this invention. It is a figure which shows schematic arrangement | positioning of the solar energy power generation system which concerns on 1st Embodiment of this invention. It is a figure which shows one structural example of a connection box. It is a figure which shows one structural example of a current collection box. It is a figure which shows the example of 1 structure of a power converter device. It is a figure which shows the example of 1 structure of a communication apparatus. It is a figure which shows the example of 1 structure of an abnormality monitoring and control apparatus. It is a figure which shows an example of the data transmission path between a communication apparatus and an abnormality monitoring and control apparatus, and an external server. It is a figure which shows schematic structure of the solar energy power generation system which concerns on 2nd Embodiment of this invention. It is a figure which shows the other structural example of a connection box. It is a figure which shows the other structural example of a power converter device. It is a figure which shows the other structural example of a communication apparatus. It is a figure which shows the other structural example of an abnormality monitoring and control apparatus. It is a figure which shows the other example of the data transmission path between a communication apparatus and an abnormality monitoring and control apparatus, and an external server. It is a figure which shows schematic structure of the solar energy power generation system which concerns on 3rd Embodiment of this invention. It is a figure which shows the further another structural example of a connection box. It is a figure which shows the further another structural example of a power converter device. It is a figure which shows the further another structural example of a communication apparatus. It is a figure which shows the further another structural example of an abnormality monitoring and control apparatus. It is a figure which shows the further another example of the data transmission path between a communication apparatus and an abnormality monitoring and control apparatus, and an external server. It is a figure which shows the required procedure etc. which differ according to the maximum output value of a photovoltaic power generation system. It is a figure which shows the required installation etc. which differ according to the maximum output value of a solar power generation system. It is a flowchart which shows the example of a determination process which a communication apparatus and an abnormality monitoring and control apparatus perform.

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

<First Embodiment>
FIG. 1A is a diagram showing a schematic configuration of a photovoltaic power generation system according to the first embodiment of the present invention. The photovoltaic power generation system according to the first embodiment of the present invention is a 500 kW class photovoltaic power generation system, and includes 160 solar cell strings 1_ # 1 to 1_ # 160 and 20 junction boxes 2_ # 1 to 1_ # 1. 2_ # 20, four current collection boxes 3_ # 1 to 3_ # 4, two power converters 4_ # 1 to 4_ # 2, a substation facility 5, sunshine meter groups 6A and 6B, and a thermometer Groups 7A and 7B, two communication devices 8_ # 1 to 8_ # 2, and one abnormality monitoring / control device 9 are provided. In the following description, solar cell strings 1_ # 1 to 1_ # 160 may be referred to as solar cell string 1 when individual division is not necessary. Similarly, in the following description, the connection box 2, the current collection box 3, the power conversion device 4, and the communication device 8 may be referred to. Moreover, schematic arrangement | positioning of the solar energy power generation system which concerns on 1st Embodiment of this invention is as FIG. 1B.

  Each of the solar cell strings 1_ # 1 to 1_ # 160 has a configuration in which 13 polycrystalline solar cell modules M1 having a maximum output of 240 W are connected in series.

  Each of the connection boxes 2_ # 1 to 2_ # 20 is an 8-circuit input connection box. The junction box 2_ # i collectively outputs the power supplied from the eight solar cell strings 1 _ # (8i-7) to 1_ # 8i (i is a natural number of 20 or less).

  One structural example of the connection box 2 is shown in FIG. In the configuration example shown in FIG. 2, the connection box 2 includes backflow prevention diodes D1 to D8 that prevent current from flowing back to the solar cell string 1 side, a lightning arrester 21 that suppresses a surge voltage during a lightning strike, and an overcurrent. A breaker 22 that opens the electric circuit when it flows is provided.

  The current collection boxes 3_ # 1 to 3_ # 4 are current collection boxes each having five circuits. The current collection box 3_ # j collectively outputs the power supplied from the five connection boxes 2 _ # (5j-4) to 2_ # 5j (j is a natural number of 4 or less). In addition, the current collection box 3 detects an abnormality in input units, that is, in units of eight solar cell strings, and outputs the detection result.

  One structural example of the current collection box 3 is shown in FIG. In the configuration example shown in FIG. 3, the current collection box 3 includes current sensors S1 to S5, a lightning arrester 31 that suppresses a surge voltage during a lightning strike, a breaker 32 that opens an electric circuit when an overcurrent flows, and a communication I / F. And an A / D converter 33 that converts the output signals (analog signals) of the current sensors S1 to S5 into digital signals and outputs the digital signals, and a power supply unit 34. The current sensor S1 of the current collection box 3_ # j has eight measurement values that are necessary to detect an abnormality in units of eight solar cell strings 1_ # (40j-39) to 1_ # (40j-32). The total output current values of the solar cell strings 1 _ # (40j-39) to 1 _ # (40j-32) are acquired, and the acquisition result is output. Further, the current sensor S2 of the current collection box 3_ # j is a measurement value necessary to detect an abnormality in units of eight solar cell strings 1_ # (40j-31) to 1_ # (40j-24). The total output current value of each of the solar cell strings 1 _ # (40j-31) to 1 _ # (40j-24) is acquired, and the acquisition result is output. The same applies to the current sensors S3 to S5 of the current collection box 3_ # j. The power supply unit 34 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V) that serves as a drive voltage for the current sensors S1 to S5 and the A / D converter 33. Voltage, DC24V voltage, etc.) and supply the current sensors S1 to S5 and the A / D converter 33. In addition, although A / D converter 33 and the power supply part 34 may be provided in all the current collection boxes 3, one A / D converter 33 may be shared by several current collection boxes 3, and the same A plurality of current collecting boxes 3 may share one power supply unit 34.

  Each of the power conversion devices 4_ # 1 to 4_ # 2 has a maximum output of 240 kW and is a two-circuit input power conversion device. The power conversion device 4_ # k converts DC power, which is the total power of the power supplied from the current collection box 3_ # (2k-1) and the power supplied from the current collection box 3_ # 2k, into AC power. Output (k is a natural number of 2 or less).

  An example of the configuration of the power conversion device 4 is shown in FIG. In the configuration example shown in FIG. 4, the power conversion device 4 converts the DC power received from the two current collection boxes 3 into AC power and outputs the AC power, and the output of the A / D converter 33. A relay 42 that relays signals and transmits them to the communication device 8, a power supply unit 43, and a power sensor S 6 that detects AC power output from the DC / AC inverter 41 are provided. The power supply unit 43 converts a commercial AC voltage (for example, an AC 100 V voltage, an AC 200 V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, a DC 12 V voltage, a DC 24 V voltage, etc.) that serves as a driving voltage for the repeater 42. To supply to the repeater 42. It should be noted that each of the two power conversion devices 4 may be provided with the repeater 42 and the power supply unit 43, but the two power conversion devices 4 may share one repeater 42. One power supply unit 43 may be shared by the power conversion device 4.

  Further, the relay 42 that relays the output signal of the A / D converter 33 and transmits it to the communication device 8 and the power supply unit 43 may be provided in a connection box or a current collection box.

  The substation equipment 5 is a two-circuit input substation equipment. The substation equipment 5 boosts the total power of the AC power supplied from the power converter 4_ # 1 and the AC power supplied from the power converter 4_ # 2 to a high voltage (for example, 6600V) or a special high voltage (for example, 72KV). To the power system (not shown).

  The sunshine meter group 6A has ten sunshine meters, and each sunshine meter of the sunshine meter group 6A is assigned and installed in each of the connection boxes 2_ # 1 to 2_ # 10. The thermometer group 7A has ten thermometers, and each thermometer of the temperature group 7A is assigned and installed in each of the connection boxes 2_ # 1 to 2_ # 10.

  Similarly, the sunshine meter group 6B has ten sunshine meters, and each sunshine meter of the sunshine meter group 6B is assigned and installed in each of the connection boxes 2_ # 11 to 2_ # 20. The thermometer group 7B has ten thermometers, and one thermometer of the temperature group 7B is assigned and installed in each of the connection boxes 2_ # 11 to 2_ # 20.

  It should be noted that the arrangement of the sunshine meter groups 6A and 6B only needs to be able to measure the amount of solar radiation represented by each of the solar cell strings 1, and the number of the irradiometers is preferably at least a plurality of the sunshine meter groups 6A and 6B. At this time, if the pyranometers are installed at positions where they can be compared with each other, the appropriate calibration time of the pyranometer can be managed and maintenance can be performed with high accuracy. Moreover, depending on arrangement | positioning of the solar cell string 1, you may be comprised by one side of the sunshine meter group 6A or 6B.

  Similarly, the arrangement of the thermometer groups 7A and 7B only needs to be able to measure the representative temperature of each of the solar cell strings 1, and the number of thermometers is preferably at least a plurality of thermometer groups 7A and 7B. At this time, if the thermometers are installed at positions where they can be compared with each other, appropriate calibration timing of the thermometers can be managed and maintenance can be performed with high accuracy. Moreover, depending on arrangement | positioning of the solar cell string 1, you may be comprised by one side of the thermometer group 7A or 7B.

  Moreover, it is preferable that the thermometer group 7A or 7B measures the temperature of an arbitrary solar cell module M1, for example, a thermocouple element or the like is attached to the back surface of the solar cell module that does not prevent power generation, and the back surface temperature of the solar cell module is measured. It doesn't matter.

  The communication device 8_ # 1 transmits the digital signal transmitted from the repeater 42 of the power conversion device 4_ # 1 to an external server (not shown in FIG. 1A) via a network according to a predetermined communication protocol. Similarly, the communication device 8_ # 2 transmits the digital signal transmitted from the repeater 42 of the power conversion device 4_ # 2 to an external server (not shown in FIG. 1A) via the network according to a predetermined communication protocol. The communication device 8_ # 1 and the communication device 8_ # 2 may be integrated into a single communication device.

  One configuration example of the communication device 8 is shown in FIG. In the configuration example illustrated in FIG. 5, the communication device 8 includes a communication interface unit that performs communication with the current collection box 3 and the A / D converter in the power conversion device 4 and communication with an external server (not illustrated in FIG. 5). 81, and a control unit 82 that controls data transmission / reception by the communication interface unit 81 and temporarily stores data received by the communication interface unit 81 in an internal temporary memory. A commercial AC voltage (for example, AC 100 V voltage, AC 200 V voltage, etc.) supplied from the outside serves as a drive voltage for the communication interface unit 81 and the control unit 82.

  When the data sent from the A / D converter in the current collection box 3 and the power converter 4 are only data indicating normality, the communication device 8 periodically collects the data and collects the data from an external server (in FIG. 5). (Not shown). On the other hand, when data indicating abnormality is sent from the A / D converter in the current collection box 3 and the power conversion device 4, the communication device 8 immediately transmits the data indicating the abnormality to the external server (FIG. 5). (Not shown).

  Since it is sufficient for the data monitoring by the communication device 8 to be performed while the solar cell string is generating power, the voltage supplied to the control unit 82 and the communication interface unit 81, that is, the power supply voltage of the communication device 8 is set to the commercial AC. Instead of the voltage, the input voltage or output voltage of the power conversion device 4 or the input voltage or output voltage of the power conversion device 4 may be converted. Similarly, the voltage supplied to the power supply unit 34 and the power supply unit 43 is not a commercial AC voltage, but a voltage obtained by converting the input voltage or output voltage of the power conversion device 4 or the input voltage or output voltage of the power conversion device 4. Good.

  The abnormality monitoring / control device 9 includes an output signal (analog signal) of the sunshine meter group 6A, an output signal (analog signal) of the sunshine meter group 6B, an output signal (analog signal) of the thermometer group 7A, and an output of the thermometer group 7B. Of the signal (analog signal), the output signal of the power sensor S6 (analog signal), and the monitoring signal sent from the substation facility 5, the analog signal is converted into a digital signal, and the digital signal and the substation facility 5 are converted. A digital signal among the monitoring signals sent from is transmitted to an external server (not shown in FIG. 1A) via a network according to a predetermined communication protocol.

  As monitoring signals sent from the substation equipment 5, for example, a signal indicating the open / close state of the circuit breaker, a signal indicating the state of the transformer, a signal indicating the failure state of the device, a measured value of voltage or current of each part, a wattmeter A signal indicating the measured value can be cited.

  An example of the configuration of the abnormality monitoring / control device 9 is shown in FIG. In the configuration example shown in FIG. 6, the abnormality monitoring / control device 9 controls a communication interface unit 91 that communicates with an external server (not shown in FIG. 6), data transmission / reception by the communication interface unit 91, and communication I / O. A control unit 92 that temporarily stores a digital signal output from F93 in an internal temporary memory, a communication I / F 93, and a power supply unit 94 are provided. The communication I / F 93 includes an A / D converter (not shown), an output signal (analog signal) of the sunshine meter group 6A, an output signal (analog signal) of the sunshine meter group 6B, and the thermometer group 7A. The output signal (analog signal), the output signal (analog signal) of the thermometer group 7B, the output signal (analog signal) of the power sensor S6, and the monitoring signal (analog signal) sent from the transformer 5 are converted into digital signals, respectively. To do. The power supply unit 94 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V voltage, DC24V voltage, etc.) to be a driving voltage of the communication I / F 93. Then, it supplies to communication I / F93.

  In addition, since the data monitoring by the abnormality monitoring / control device 9 must be performed even during a period in which the solar cell string is not generating power, the power conversion device can be used without supplying a commercial AC voltage to the power supply voltage of the abnormality monitoring / control device 9. When the input voltage or output voltage of 4 or the input voltage or output voltage of the power conversion device 4 is converted to a converted voltage, delay or restriction occurs in the operation of the abnormality monitoring / control device.

  Here, FIG. 7 shows an example of a data transmission path between the communication device 8 and the abnormality monitoring / control device 9 and the external server.

  In the example shown in FIG. 7, the communication devices 8_ # 1 and 8_ # 2 transmit data to the external server 102 via the mobile phone network or the router 100 and the Internet 101, and the abnormality monitoring / control device 9 transmits data to the external server 102 via the router 100 and the Internet 101.

  Further, the communication devices 8_ # 1 and 8_ # 2 and the abnormality monitoring / control device 9 monitor each other for failure. As a result, the communication devices 8_ # 1 and 8_ # 2 and the abnormality monitoring / control device 9 which are data transmission devices that transmit monitoring data can be mutually monitored and notified to the device administrator, the monitoring device, and the external server. . For example, the communication devices 8_ # 1 and 8_ # 2 transmit an inquiry signal to the abnormality monitoring / control device 9 at a predetermined cycle, and the abnormality monitoring / control device 9 transmits a response signal according to the inquiry signal to the communication device. Reply to 8_ # 1 and 8_ # 2. When the communication devices 8_ # 1 and 8_ # 2 receive the response signal from the abnormality monitoring / control device 9, it is determined that the abnormality monitoring / control device 9 has not failed. Conversely, the abnormality monitoring / control device 9 transmits an inquiry signal to the communication devices 8_ # 1 and 8_ # 2 at a predetermined cycle, and the communication devices 8_ # 1 and 8_ # 2 respond according to the inquiry signal. The signal is returned to the abnormality monitoring / control device 9. When the abnormality monitoring / control device 9 receives the response signals from the communication devices 8_ # 1 and 8_ # 2, it determines that the communication devices 8_ # 1 and 8_ # 2 are not out of order. As another method, a failure may be determined based on the period and the pulse width by inserting an inspection device in each device and detecting an internal clock signal.

  The communication device 8_ # 1 and the communication device 8_ # 2 may be integrated into a single communication device.

  The communication device 8 and the abnormality monitoring / control device 9 may be a single device. However, in this case, the power supply of the functional portion corresponding to the communication device 8 and the power supply of the functional portion corresponding to the abnormality monitoring / control device 9 are separated, and even if an abnormality occurs in one power supply, it corresponds to the communication device 8. The function part to be performed and the function part corresponding to the abnormality monitoring / control device 9 are not stopped simultaneously.

  In a photovoltaic power generation system including the same number (160) of solar cell strings as the solar power generation system according to the first embodiment of the present invention, 160 current sensors are required to detect a current abnormality for each solar cell string. Become. On the other hand, since the photovoltaic power generation system according to the first embodiment of the present invention is configured to include 20 current sensors that acquire the total output current value of the 8 solar cell strings, the installation cost of the current sensor And maintenance costs can be greatly reduced.

  Moreover, the photovoltaic power generation of the same specification as the photovoltaic power generation system according to the first embodiment of the present invention (160 solar cell strings, 20 junction boxes, 4 current collection boxes, and 2 power converters). In the system, for example, when it can be recognized that there is an abnormality when a power generation reduction of 10% is recognized, in the first embodiment of the present invention, one solar cell string generates power at every input circuit unit of the current collection box. If the current sensor has the same sensitivity as that of the first embodiment of the present invention, the four solar cell strings are completely generated by the input circuit unit of the power converter. If you do not have any abnormalities, you will not notice. Therefore, it is possible to quickly identify a solar cell string that has failed and no longer generates electricity. Or if it is going to perform abnormality detection equivalent to the solar power generation system which concerns on 1st Embodiment of this invention, a current sensor will recognize the reduction | decrease in the current value of 1/40 of the total output current value of 40 solar cell strings. Sensitivity is required and the initial investment increases, and the daily inspection and calibration frequency of the current sensor itself, the pyranometer group, and the thermometer group increases, and the burden of maintenance management of the measurement equipment for maintenance of the photovoltaic power generation system increases. Become.

  In the photovoltaic power generation system according to the first embodiment of the present invention, five current sensors are provided in one current collection box 3 and 20 current sensors are provided on the input side of the current collection box 3. One current box may be provided in one connection box 2 and 20 current sensors may be provided on the output side of the connection box 2. However, the configuration in which 20 current sensors are provided on the input side of the current collection box 3 can consolidate current sensors compared to the configuration in which 20 current sensors are provided on the output side of the connection box 2, and the signal line In order to facilitate laying and maintenance work of current sensors, a configuration in which 20 current sensors are provided on the input side of the current collection box 3 is desirable.

  The specification of the solar cell module or the number of each component used in the present embodiment is merely an example, and the present invention is not limited to the specification of the solar cell module or the number of each component used in the present embodiment. . As another example, 3840 thin film solar cell modules with a maximum output of 130 W are provided, 80 solar cell strings in which thin film solar cell modules with a maximum output of 130 W are connected in 8 series and 3 in parallel are provided, and a connection box with 8 circuit inputs is provided. There can be mentioned a configuration in which 20 units are provided, four 5-circuit input current collection boxes are provided, two power converters having a maximum output of 500 kW and two circuit inputs are provided. In the case of a solar power generation system having this configuration, for example, the system can be installed on a rectangular site having a short side of about 150 m and a long side of about 200 m.

  In this embodiment, the abnormality monitoring / control device 9 transmits data related to the sunshine meter groups 6A and 6B and the thermometer groups 7A and 7B, but the communication device 8 transmits the data to the sunshine meter groups 6A and 6B and the thermometer. Data related to the groups 7A and 7B may be transmitted.

Second Embodiment
FIG. 8 is a diagram showing a schematic configuration of a photovoltaic power generation system according to the second embodiment of the present invention.

  Unlike the photovoltaic power generation system according to the first embodiment of the present invention, the photovoltaic power generation system according to the second embodiment of the present invention has a configuration that does not include a current collection box, and includes 40 solar cell strings 11_. # 1 to 11_ # 40, two junction boxes 12_ # 1 to 12_ # 2, one power conversion device 14, a substation facility 15, a sunshine meter group 16, a thermometer group 17, and one Communication device 18 and one abnormality monitoring / controlling device 19.

  Each of the solar cell strings 11_ # 1 to 1_ # 40 has a configuration in which a plurality of solar cell modules are connected in series. Two adjacent solar cell strings are connected in parallel by a branch cable and then connected to the connection box 2.

  Each of the connection boxes 12_ # 1 to 12_ # 2 is a connection box with 10 circuit inputs. The connection box 12_ # 1 collectively outputs the power supplied from the 20 solar cell strings 11_ # 1 to 11_ # 20. Similarly, the junction box 12_ # 2 collectively outputs the power supplied from the 20 solar cell strings 11_ # 21 to 11_ # 40.

  One structural example of the connection box 12 is shown in FIG. In the configuration example shown in FIG. 9, the connection box 12 suppresses the reverse current prevention diodes D11 to D20 that prevent the current from flowing backward to the solar cell string 11 side, the current sensors S11 to S20, and the surge voltage during lightning strikes. A / D that has a lightning arrester 23, a breaker 24 that opens an electric circuit when an overcurrent flows, and a communication I / F that converts the output signals (analog signals) of the current sensors S11 to S20 into digital signals and outputs them. A converter 25 and a power supply unit 26 are provided. The current sensor S11 of the junction box 12_ # 1 has two solar cell strings 11_ # 1 to 11_ # that are measurement values necessary to detect an abnormality in units of the two solar cell strings 11_ # 1 to 11_ # 2. The total output current value of 2 is acquired, and the acquisition result is output. Further, the current sensor S12 of the junction box 12_ # 2 has two solar cell strings 11_ # 3 which are measurement values necessary for detecting an abnormality in units of the two solar cell strings 11_ # 3 to 11_ # 4). The total output current value of ˜11_ # 4 is acquired, and the acquisition result is output. The same applies to the current sensors S13 to S20 of the connection box 12_ # 1. Further, the connection box 12_ # 2 is also the same as the connection box 12_ # 1 except that the solar cell string number corresponding to each current sensor is changed. The power supply unit 26 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V) that serves as a drive voltage for the current sensors S11 to S20 and the A / D converter 25. Voltage, DC24V voltage, etc.) and supply the current sensors S11 to S20 and the A / D converter 25. The A / D converter 25 and the power supply unit 26 may be provided in each of the two connection boxes 12, but one A / D converter 25 may be shared by the two connection boxes 12. One power supply unit 26 may be shared by two connection boxes 12.

  The power converter 14 is a two-circuit input power converter. The power conversion device 14 converts DC power, which is the total power of the power supplied from the connection box 12_ # 1 and the power supplied from the connection box 12_ # 2, into AC power and outputs the AC power.

  One structural example of the power converter 14 is shown in FIG. In the configuration example shown in FIG. 10, the power converter 14 converts the DC power received from the two connection boxes 12 into AC power and outputs the AC power, and the output signal of the A / D converter 25. Is transmitted to the communication device 18, a power supply unit 47, and a power sensor S 7 for detecting AC power output from the DC / AC inverter 45. The power supply unit 47 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V voltage, DC24V voltage, etc.) to be a driving voltage of the repeater 46. To supply to the repeater 46.

  The substation facility 15 is a one-circuit input substation facility. The substation facility 15 boosts the AC power supplied from the power converter 14 to a high voltage (for example, 6600 V) or a special high voltage (7000 V or more, for example, 77 kV) and outputs the boosted power to a power system (not shown).

  The sunshine meter group 16 has ten sunshine meters, and each sunshine meter of the sunshine meter group 16 is assigned to one branch cable and installed. The thermometer group 17 has ten thermometers, and each thermometer of the temperature group 17 is assigned to each branch cable and installed.

  Moreover, it is preferable that the thermometer group 17 measures the temperature of arbitrary solar cell modules, for example, even if it attaches a thermocouple element etc. to the back surface of the solar cell module which does not prevent electric power generation, and measures a solar cell module back surface temperature. I do not care.

  The communication device 18 transmits the digital signal transmitted from the repeater 46 of the power conversion device 14 to an external server (not shown in FIG. 8) via a network according to a predetermined communication protocol.

  One configuration example of the communication device 18 is shown in FIG. In the configuration example shown in FIG. 11, the communication device 18 communicates with the connection box 12 and the A / D converter in the power converter 14 and communicates with an external server (not shown in FIG. 11). And a control unit 84 that controls transmission / reception of data by the communication interface unit 83 and temporarily stores data received by the communication interface unit 83 in an internal temporary memory. A commercial AC voltage (for example, AC 100 V voltage, AC 200 V voltage, etc.) supplied from the outside serves as a drive voltage for the communication interface unit 83 and the control unit 84.

  When the data sent from the A / D converter in the connection box 12 and the power converter 14 are only data indicating normality, the communication device 18 periodically collects the data and sends it to an external server (not shown in FIG. 11). (Shown). In contrast, when data indicating an abnormality is sent from the A / D converter in the connection box 12 and the power conversion device 14, the communication device 18 immediately transmits the data indicating the abnormality to an external server (in FIG. 11). (Not shown).

  Note that the data monitoring by the communication device 18 is sufficient if it is performed during the period when the solar cell string is generating power. Therefore, the voltage supplied to the control unit 84 and the communication interface unit 83, that is, the power supply voltage of the communication device 18, Instead of the voltage, the input voltage or output voltage of the power converter 14 or the input voltage or output voltage of the power converter 14 may be converted. Similarly, the voltage supplied to the power supply units 26 and 47 may be a voltage obtained by converting the input voltage or output voltage of the power converter 14 or the input voltage or output voltage of the power converter 14 instead of the commercial AC voltage.

  The abnormality monitoring / control device 19 is sent from the output signal (analog signal) of the sunshine meter group 16, the output signal (analog signal) of the thermometer group 17, the output signal (analog signal) of the power sensor S7, and the substation equipment 15. Among the monitoring signals that come, analog signals are converted into digital signals, and the digital signals out of the digital signals and the monitoring signals sent from the transformer 5 are connected to an external server via a network according to a predetermined communication protocol. (Not shown in FIG. 12).

  Examples of the monitoring signal sent from the substation facility 15 include a signal indicating the open / close state of the circuit breaker, a signal indicating the state of the transformer, a signal indicating the failure state of the device, a measured value of voltage and current of each part, a wattmeter A signal indicating the measured value can be cited.

  An example of the configuration of the abnormality monitoring / control device 19 is shown in FIG. In the configuration example shown in FIG. 12, the abnormality monitoring / control device 19 controls the communication interface unit 95 that communicates with an external server (not shown in FIG. 12), the transmission and reception of data by the communication interface unit 95 and the communication I / O. A control unit 96 that temporarily stores a digital signal output from F97 in an internal temporary memory, a communication I / F 97, and a power supply unit 98 are provided. The communication I / F 97 includes an A / D converter (not shown), an output signal (analog signal) of the sunshine meter group 16, an output signal (analog signal) of the thermometer group 17, and an output of the power sensor S7. The signal (analog signal) and the monitoring signal (analog signal) sent from the substation equipment 15 are converted into digital signals, respectively. The power supply unit 98 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V voltage, DC24V voltage, etc.) to be a driving voltage of the communication I / F 97. Then, it supplies to communication I / F97.

  In addition, since the data monitoring by the abnormality monitoring / control device 19 must be performed even during a period when the solar cell string is not generating power, the power conversion device can be used without supplying a commercial AC voltage to the power supply voltage of the abnormality monitoring / control device 19. When the input voltage or output voltage of 14 or the input voltage or output voltage of the power conversion device 14 is converted into a converted voltage, delay or restriction occurs in the operation of the abnormality monitoring / control device.

  Here, FIG. 13 shows an example of a data transmission path between the communication device 18 and the abnormality monitoring / control device 19 and the external server.

  In the example shown in FIG. 13, the communication device 18 transmits data to the external server 105 via the mobile phone network or router 103 and the Internet 104, and the abnormality monitoring / control device 19 is connected to the router 103. Data is transmitted to the external server 105 via the Internet 104.

  Further, the communication device 18 and the abnormality monitoring / control device 19 monitor each other for failure. As a result, it is possible to monitor the communication device 18 and the abnormality monitoring / control device 19 which are data transmission devices that transmit monitoring data. For example, the communication device 18 transmits an inquiry signal to the abnormality monitoring / control device 19 at a predetermined cycle, and the abnormality monitoring / control device 19 returns a response signal to the communication device 18 according to the inquiry signal. When the communication device 18 receives the response signal from the abnormality monitoring / control device 19, it determines that the abnormality monitoring / control device 19 has not failed. Conversely, the abnormality monitoring / control device 19 transmits an inquiry signal to the communication device 18 at a predetermined cycle, and the communication device 18 returns a response signal to the abnormality monitoring / control device 19 in accordance with the inquiry signal. When the abnormality monitoring / control device 19 receives the response signal from the communication device 18, it determines that the communication device 18 has not failed. As another method, a failure may be determined based on the period and the pulse width by inserting an inspection device in each device and detecting an internal clock signal.

  The communication device 18 and the abnormality monitoring / control device 19 may be a single device. However, in this case, the power supply of the functional portion corresponding to the communication device 18 and the power supply of the functional portion corresponding to the abnormality monitoring / control device 19 are separated, and even if an abnormality occurs in one power supply, it corresponds to the communication device 18. The function part corresponding to the abnormality monitoring / control device 19 is not stopped simultaneously.

  In the solar power generation system including the same number (40) of solar cell strings as the solar power generation system according to the second embodiment of the present invention, 40 current sensors are required to detect a current abnormality for each solar cell string. Become. On the other hand, since the photovoltaic power generation system according to the second embodiment of the present invention is configured to include 20 current sensors that acquire the total output current value of two solar cell strings, the communication device 18 externally The amount of management data to be transmitted to the server is reduced, the required specifications for the throughput of the communication unit in the external server and the photovoltaic power generation system can be further lowered, and the installation cost and maintenance cost of the current sensor are greatly increased. Can be suppressed. Therefore, remote monitoring can be realized at a much lower cost.

  Moreover, the solar cell power generation system according to the second embodiment of the present invention is provided with the same number (40) of solar cell strings as the solar power generation system according to the second embodiment of the present invention (two circuit inputs) and the same number. In a photovoltaic power generation system including (one) power conversion device, if it is attempted to detect a current abnormality in the solar cell string for each circuit input of the power conversion device, two current sensors are required, but each current sensor has 20 The total output current value of each solar cell string is acquired. Therefore, when an abnormality is detected, it is necessary to investigate a maximum of 20 solar cell strings in order to identify a solar cell string in which a failure has occurred. On the other hand, in the photovoltaic power generation system according to the second embodiment of the present invention, each current sensor acquires the total output current value of two solar cell strings, so that when an abnormality is detected, the abnormality is detected. When detected, a maximum of two solar cell strings to investigate to identify the solar cell string in which a failure has occurred is sufficient. Therefore, the solar cell string in which the failure has occurred can be identified quickly.

<Third Embodiment>
FIG. 14: is a figure which shows schematic structure of the solar energy power generation system which concerns on 3rd Embodiment of this invention.

  Unlike the photovoltaic power generation system according to the first embodiment of the present invention, the photovoltaic power generation system according to the third embodiment of the present invention does not include a current collection box, and has 160 solar cell strings 121_. # 1 to 121_ # 160, 20 junction boxes 122_ # 1 to 122_ # 20, one power conversion device 124, substation equipment 125, sunshine meter group 126, thermometer group 127, and one unit Communication device 128 and one abnormality monitoring / control device 129.

  Each of the solar cell strings 121_ # 1 to 121_ # 160 has a configuration in which a plurality of solar cell modules are connected in series.

  Each of the connection boxes 122_ # 1 to 122_ # 20 is an 8-circuit input connection box. The connection box 122_ # 1 collectively outputs the power supplied from the eight solar cell strings 121_ # 1 to 121_ # 8. Similarly, the junction box 122_ # 2 collectively outputs the electric power supplied from the eight solar cell strings 121_ # 9 to 121_ # 16. The same applies to the connection boxes 122_ # 3 to 122_ # 8.

  One structural example of the connection box 122 is shown in FIG. In the configuration example shown in FIG. 15, the connection box 122 includes backflow prevention diodes D21 to D28 that prevent a current from flowing back to the solar cell string 121 side, a lightning arrester 201 that suppresses a surge voltage during a lightning strike, and an overcurrent. A breaker 202 that opens the electric circuit when it flows is provided. Moreover, as shown in FIG. 15, you may equip the anode side of the backflow prevention diodes D21-D28 with the breakers (disconnectors) B1-B8 for improving safety | security at the time of the maintenance of a solar cell string. .

  The power converter 124 is a 20-circuit input power converter. The power conversion device 124 converts DC power, which is total power supplied from the connection boxes 122_ # 1 to 122_ # 20, into AC power and outputs the AC power.

  One structural example of the power converter 124 is shown in FIG. In the configuration example shown in FIG. 16, the power conversion device 124 converts the DC power received from the 20 connection boxes 122 into AC power and outputs the AC power, the current sensors S21 to S40, and the communication I. A / D converter 204 that converts the output signals (analog signals) of the current sensors S21 to S40 into digital signals and outputs them, the power supply unit 205, and the DC / AC inverter 203. And a power sensor S7 for detecting AC power.

  In addition, the current sensor S21 that measures the amount of current from the junction box 122_ # 1 has eight solar values that are measurement values necessary to detect an abnormality in units of eight solar cell strings 121_ # 1 to 121_ # 8. The total output current values of the battery strings 121_ # 1 to 121_ # 8 are acquired, and the acquisition result is output. Further, the current sensor S22 that measures the amount of current from the junction box 122_ # 2 has eight solar values that are measurement values necessary to detect an abnormality in units of eight solar cell strings 121_ # 9 to 121_ # 16. The total output current values of the battery strings 121_ # 9 to 121_ # 16 are acquired, and the acquisition results are output. The same applies to the current sensors S23 to S40 that measure the amount of current from the connection boxes 122_ # 3 to 122_ # 20. The power supply unit 205 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V) that serves as a drive voltage for the current sensors S21 to S40 and the A / D converter 204. Voltage, DC 24V voltage, etc.) and supply the current sensors S21 to S40 and the A / D converter 204.

  The current sensors S21 to S40, the A / D converter 204, and the like may be configured separately from the power converter 124.

  The substation facility 125 is a one-circuit input substation facility. The substation facility 125 boosts the AC power supplied from the power converter 124 to a high voltage (for example, 6600 V) or a special high voltage (for example, 72 KV) and outputs the boosted voltage to a power system (not shown).

  The sunshine meter group 126 has 20 sunshine meters, and each sunshine meter of the sunshine meter group 126 is assigned and installed in each of the connection boxes 122_ # 1 to 122_ # 20. The thermometer group 127 has 20 thermometers, and one thermometer of the temperature group 127 is assigned and installed in each of the connection boxes 122_ # 1 to 122_ # 20.

  Moreover, it is preferable that the thermometer group 127 measures the temperature of an arbitrary solar cell module. For example, a thermocouple element or the like is attached to the back surface of a solar cell module that does not interfere with power generation, and the back surface temperature of the solar cell module is measured. I do not care.

  The communication device 128 transmits the digital signal transmitted from the A / D converter 204 of the power converter 124 to an external server (not shown in FIG. 14) via a network according to a predetermined communication protocol.

  One configuration example of the communication device 128 is shown in FIG. In the configuration example shown in FIG. 17, the communication device 128 communicates with the connection box 122 and the A / D converter in the power converter 124 and communicates with an external server (not shown in FIG. 17). And a control unit 207 that controls transmission / reception of data by the communication interface unit 206 and temporarily stores data received by the communication interface unit 206 in an internal temporary memory. A commercial AC voltage (for example, AC 100 V voltage, AC 200 V voltage, etc.) supplied from the outside serves as a drive voltage for the communication interface unit 206 and the control unit 207.

  When the data sent from the A / D converters in the connection box 122 and the power converter 124 are only data indicating normality, the communication device 128 periodically collects the data and sends it to an external server (not shown in FIG. 17). (Shown). In contrast, when data indicating an abnormality is sent from the A / D converter in the connection box 122 and the power converter 124, the communication device 128 immediately transmits the data indicating the abnormality to an external server (in FIG. 17). (Not shown).

  Note that the data monitoring by the communication device 128 is sufficient if it is performed during the period in which the solar cell string is generating power. Therefore, the voltage supplied to the control unit 207 and the communication interface unit 206, that is, the power supply voltage of the communication device 128 is changed to commercial AC. Instead of the voltage, a voltage obtained by converting the input voltage or output voltage of the power converter 124 or the input voltage or output voltage of the power converter 124 may be used. Similarly, the voltage supplied to the power supply unit 205 may be a voltage obtained by converting the input voltage or output voltage of the power converter 124 or the input voltage or output voltage of the power converter 124 instead of the commercial AC voltage.

  The abnormality monitoring / control device 129 is sent from the output signal (analog signal) of the sunshine meter group 126, the output signal (analog signal) of the thermometer group 127, the output signal (analog signal) of the power sensor S8, and the substation equipment 125. Among the monitoring signals that come, analog signals are converted into digital signals, and the digital signals out of the digital signals and the monitoring signals sent from the transformer 5 are connected to an external server via a network according to a predetermined communication protocol. (Not shown in FIG. 18).

  As monitoring signals sent from the substation equipment 125, for example, a signal indicating the open / close state of the circuit breaker, a signal indicating the state of the transformer, a signal indicating the failure state of the device, a measured value of voltage or current of each part, a wattmeter A signal indicating the measured value can be cited.

  A configuration example of the abnormality monitoring / control device 129 is shown in FIG. In the configuration example shown in FIG. 18, the abnormality monitoring / control device 129 controls the communication interface unit 208 that communicates with an external server (not shown in FIG. 18), the transmission and reception of data by the communication interface unit 208, and the communication I / O. A control unit 209 that temporarily stores a digital signal output from the F210 in an internal temporary memory, a communication I / F 210, and a power supply unit 211 are provided. The communication I / F 210 includes an A / D converter (not shown), an output signal (analog signal) of the sunshine meter group 126, an output signal (analog signal) of the thermometer group 127, and an output of the power sensor S8. The signal (analog signal) and the monitoring signal (analog signal) sent from the substation equipment 125 are converted into digital signals, respectively. The power supply unit 211 converts a commercial AC voltage (for example, AC100V voltage, AC200V voltage, etc.) supplied from the outside into a predetermined DC voltage (for example, DC12V voltage, DC24V voltage, etc.) to be a driving voltage of the communication I / F 210. Then, it supplies to communication I / F210.

  In addition, since the data monitoring by the abnormality monitoring / control device 129 must be performed even during a period when the solar cell string is not generating power, the power conversion device can be used without supplying the power supply voltage of the abnormality monitoring / control device 129 without a commercial AC voltage. When the input voltage or output voltage of 124 or the input voltage or output voltage of the power converter 124 is converted to a converted voltage, delay or restriction occurs in the operation of the abnormality monitoring / control device.

  Here, FIG. 19 shows an example of a data transmission path between the communication device 128 and the abnormality monitoring / control device 129 and the external server.

  In the example shown in FIG. 19, the communication device 128 transmits data to the external server 108 via the mobile phone network or router 106 and the Internet 107, and the abnormality monitoring / control device 129 is connected to the router 106. Data is transmitted to the external server 108 via the Internet 107.

  In addition, the communication device 128 and the abnormality monitoring / control device 129 monitor each other for failure. Thereby, it is possible to monitor the communication device 128 and the abnormality monitoring / control device 129 which are data transmission devices that transmit monitoring data. For example, the communication device 128 transmits an inquiry signal to the abnormality monitoring / control device 129 at a predetermined cycle, and the abnormality monitoring / control device 129 returns a response signal to the communication device 128 according to the inquiry signal. When the communication device 128 receives the response signal from the abnormality monitoring / control device 19, it determines that the abnormality monitoring / control device 129 has not failed. Conversely, the abnormality monitoring / control device 129 transmits an inquiry signal to the communication device 128 at a predetermined cycle, and the communication device 128 returns a response signal to the abnormality monitoring / control device 129 in response to the inquiry signal. When the abnormality monitoring / control device 129 receives the response signal from the communication device 128, the abnormality monitoring / control device 129 determines that the communication device 128 has not failed. As another method, a failure may be determined based on the period and the pulse width by inserting an inspection device in each device and detecting an internal clock signal.

  The communication device 128 and the abnormality monitoring / control device 129 may be a single device. However, in this case, the power supply of the functional part corresponding to the communication device 128 and the power supply of the functional part corresponding to the abnormality monitoring / control device 129 are separated, and even if an abnormality occurs in one power supply, it corresponds to the communication device 128. The functional part corresponding to the abnormality monitoring / control device 129 is not stopped simultaneously.

  In a solar power generation system including the same number (160) of solar battery strings as the solar power generation system according to the third embodiment of the present invention, 160 current sensors are required to detect a current abnormality for each solar battery string. Become. On the other hand, since the photovoltaic power generation system according to the third embodiment of the present invention is configured to include 20 current sensors that acquire the total output current value of the eight solar cell strings, the installation cost of the current sensor And maintenance costs can be greatly reduced.

<Maintenance of solar power generation system>
Although the contents of the purchase system differ from country to country, for example, the interest and expectation of solar power generation system electric power companies are the stable power generation and the stability of the amount of power sold, and a proposal for a mechanism to ensure this is required.

  The photovoltaic power generation system according to the embodiment of the present invention can detect an abnormality in a small unit of the first predetermined number (two or more) of the solar cell strings, so that the solar cell string in which the power generation amount is extremely reduced can be quickly In this way, it is possible to reach the corresponding part (measurement value acquisition unit), and it is possible for the photovoltaic power generation system power company to receive an accurate and quick maintenance service. Therefore, it is possible to avoid a loss of power sales revenue due to oversight of a decrease in power generation.

  In addition, when the measurement value acquisition unit measures the amount of power generation in the connection box unit, the fault location is identified and the corresponding connection box or current collection box is driven without having to measure and inspect all connection boxes or current collection boxes. This makes it possible to reduce maintenance time. In other words, it is possible to improve the power generation operation rate of the solar power generation system.

  In addition, by constantly monitoring the output characteristics of each junction box, the power path between the module and the power converter is monitored. It becomes possible to reduce. As a result, the burden of maintenance costs on the photovoltaic power system operator is reduced, and the recovery of the investment amount is accelerated.

  In addition, when the measurement value acquisition unit measures the amount of power generated in the connection box unit, repairing and repairing the corresponding part with the lowest output measurement value among the values of the mutual measurement value acquisition unit is the most effective at low cost. Large maintenance service.

  For example, in a photovoltaic power generation system in which solar cell strings composed of 13 series of 240 W modules are input to the connection box in 8 parallels and the output of the power conditioner (hereinafter referred to as power converter) is 250 kW, the output of the connection box is 3. 12 kW × 8 = 24.96 kW, 1 string output 240 W × 13 = 3.12 KW. Assuming that one string breaks down and the output is assumed to be 0 W, when the measured value is acquired in the connection box unit, it is detected as an output drop of 3.12 KW ÷ 24.96 kW = 12.5%. However, when the measured value is acquired in units of power conditioner, it is 3.12kW / 250kW = 1.25%. Taking into account factors such as fluctuations in solar radiation, it is difficult to detect a failure in which one string almost stops generating power.

  In other words, it is possible to reduce oversight of the decrease in the amount of power generation by subdividing the monitoring from the power control unit to the connection box unit. When the measured value acquisition unit measures the amount of power generated by each power converter, for example, assuming that the measurement error of the power converter is ± 5%, if the power selling price is 40 yen / kwh for a 2 MW system Even if there is a loss of about 2,300,000kwh x 40 yen / kwh x 0.05 = 4,600,000 yen per year, there is a possibility of overlooking, but when the measurement value acquisition unit measures the power generation amount of the connection box unit, the measurement error is one string The unit is 0.16% of the total system (640 strings @ 2 MW).

  A 2MW system can avoid overlooking over 2,300,000 kwh x 40 yen / kwh x 0.0016 = 147,200 yen per year.

  In addition, by sending information to the maintenance manager via the Internet connection, etc., the power generation amount measured by the measured value acquisition unit on the connection box basis, it is possible to bring the necessary parts for repairs to the site quickly. become.

  Moreover, even if the linear guarantee of the module power generation output is guaranteed, the power generation company is obliged to find a module whose output has decreased, and thus the linear guarantee of the real module power generation output may not function. On the other hand, measuring the amount of power generated for each module is not practical because it requires an initial cost for installing a measuring device composed of electronic components in units of modules and a cost for maintaining and replacing the measuring device itself. In response to these problems, the photovoltaic power generation system according to the embodiment of the present invention allows the measurement value acquisition unit to measure the amount of power generation in the connection box unit, so that all the connection boxes or current collection boxes are manually operated by maintenance personnel. Even if the measurement inspection is not performed, the failure location of the solar cell string can be specified, so that the maintenance operation cost can be reduced, and the maintenance maintenance based on the linear guarantee of the module power generation output can be handled.

<Solar power plant>
In Japan, as shown in FIG. 20, the necessary procedures and the purchase price of generated power differ depending on the maximum output value of the photovoltaic power generation system. The smaller the maximum output value, the more the owner of the system. There are many benefits. Therefore, specifications aiming at the upper limit of each category (maximum output value less than 500 kW and as close to 500 kW as possible, maximum output value less than 1 MW and as close as possible to 1 MW, less than 2 MW, and maximum as close as possible to 2 MW) Output value) is preferred. However, since the maximum output of a general power converter is 100 kW or 250 kW, it can be said that the specification in which the maximum output value is set to any one of 400 kW, 900 kW, and 1.9 MW is common. In particular, when the maximum output value is 2 MW or more, an expensive extra high voltage substation equipment is required. For example, in the case of a 1.9 MW solar power generation system and a 2.1 MW solar power generation system, a 1.9 MW solar power generation system However, the capital investment cost can be reduced. That is, the system installation cost and the maintenance cost can be significantly reduced by setting the power generation output to a specific value or less.

  Therefore, in the photovoltaic power generation system according to the present invention, the maximum output value is a predetermined value within a range of 400 kW or more and less than 500 kW, a predetermined value within a range of 900 kW or more and less than 1 MW, and a predetermined value within a range of 1.9 MW or more and less than 2 MW. It is desirable to set any value.

  Further, in Thailand, for example, as shown in FIG. 21, necessary facilities and the like differ depending on the maximum output value of the photovoltaic power generation system, and the smaller the maximum output value, the greater the merit for the system owner. ing. In Japan, the same or similar regulations may be implemented in the future. Therefore, when the maximum output value of the photovoltaic power generation system is classified into a plurality of categories according to laws and regulations, in each category, a predetermined value that is greater than or equal to the value obtained by subtracting 100 kW from the category upper limit threshold and less than the category upper limit threshold In addition, it is desirable to set the maximum output value of the photovoltaic power generation system according to the present invention.

  In the first embodiment described above, the connection box and the current collection box are separate bodies, but the connection box and the current collection box may have an integrated structure.

  Moreover, in embodiment mentioned above, although the power converter device was a structure provided with a DC / AC inverter, when the photovoltaic power generation system which concerns on this invention supplies electric power to a DC power system, a power converter device is It is good to make it the structure provided with the DC / DC converter which converts DC power of a certain voltage value into DC power of a different voltage value, and to make a substation equipment into the equipment which boosts DC voltage.

  In addition, the above-mentioned “power converter” may be a high-voltage substation or special high-voltage substation required for high-voltage interconnection to the power system, or a charger / discharger that temporarily charges and discharges the generated power to the storage battery. Absent.

  As an example of a power generation unit that generates electric power from renewable energy, a solar power generation system has been described as an example. However, the power generation unit includes an induction generator that generates electric power from the rotational motion of a windmill as a power generation unit. As such, it may be a high-voltage substation or a special high-voltage substation required for high-voltage connection to the power system. Alternatively, a windmill and a speed increaser may be used as a power generation unit, and an induction generator that generates power from rotational motion may be used as a power conversion unit.

  Examples of renewable energy include tidal power generation, geothermal power generation, solar thermal power generation, and the like. A generator that generates electric power from the rotational motion of a turbine may be used as a power generation unit. Alternatively, a generator that generates electric power from the rotational motion of the turbine using the turbine itself as a power generation unit may be used as the power conversion unit.

  In the above-described embodiment, the communication device and the abnormality monitoring / control apparatus transmit the acquired data to the external server as they are. However, the communication device and the abnormality monitoring / control apparatus are normal for at least one of the acquired data as shown in the flowchart of FIG. It may be determined whether or not there is an abnormality, and if it is abnormal, the alarm level may be changed according to the degree of departure from the normal value (notification to the external server). In this case, it is possible to provide a judgment material that serves as a reference when determining what action should be taken when an abnormality occurs to a chief engineer who performs remote monitoring using an external server. Note that “normal value”, “normal value determination coefficient”, “alarm level 1 coefficient” or “alarm level n−1 coefficient” in FIG. 22 are positive values, and “normal value determination coefficient” <“alarm level”. The relationship of “1 coefficient” <“alarm level 2 coefficient” <... <“Alarm level n−1 coefficient” is satisfied. FIG. 22 illustrates the case where the determination target data is data that is larger than the normal range at the time of abnormality. However, when the determination target data is data that is smaller than the normal range at the time of abnormality, each step is performed. You can reverse the inequality sign.

1_ # 1 to 1_ # 160, 11_ # 1 to 11_ # 40, 121_ # 1 to 121_160 Solar cell string 2_ # 1 to 2_ # 20, 12_ # 1 to 12_ # 2, 122_ # 1 to 122_ # 20 Junction box 3_ # 1-3_ # 4 Current collection box 4_ # 1-4_ # 2, 14, 124 Power conversion device 5, 15, 125 Substation 6A, 6B, 16, 126 Sunlight group 7A, 7B, 17, 127 Thermometer group 8_ # 1 to 8_ # 2, 18, 128 Communication device 9, 19, 129 Abnormality monitoring / control device 21, 31, 23, 201 Arrester 22, 24, 32, 202 Breaker 25, 33, 204, A / D converter 26, 34, 43, 47, 94, 205, 211 Power supply 41, 45, 203 DC / AC inverter 42, 46 Repeater 81, 83, 91, 95, 206, 208 Communication interface unit 82, 84, 92, 96, 207, 209 Control unit 93, 97, 210 Communication I / F
B1-B8 breaker (disconnector)
D1 to D8, D11 to D28 Backflow prevention diodes S1 to S5, S11 to S40 Current sensor S6 to S8 Power sensor

Claims (4)

A plurality of power generation units that generate power from renewable energy;
A power conversion unit for converting power output from the plurality of power generation units;
A first data transmission unit for transmitting monitoring data related to an input side of the power conversion unit;
A second data transmission unit for transmitting monitoring data related to the output side of the power conversion unit,
A power generation system, wherein the first data transmission unit and the second data transmission unit monitor each other for failure and report a failure of a monitoring device.   2. The power generation system according to claim 1, wherein a power supply voltage of the first data transmission unit is an input voltage or an output voltage of the power conversion unit or a voltage obtained by converting an input voltage or an output voltage of the power conversion unit.   The power generation system according to claim 1 or 2, wherein the power supply voltage of the second data transmission unit is a voltage supplied from outside the power generation system or a voltage obtained by converting an output voltage of the power conversion unit.   The power generation system according to any one of claims 1 to 3, wherein the power generation system is a solar power generation system.

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