WO2014007255A1 - Appareil de commande de courant pour inspection de cellule solaire - Google Patents

Appareil de commande de courant pour inspection de cellule solaire Download PDF

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Publication number
WO2014007255A1
WO2014007255A1 PCT/JP2013/068153 JP2013068153W WO2014007255A1 WO 2014007255 A1 WO2014007255 A1 WO 2014007255A1 JP 2013068153 W JP2013068153 W JP 2013068153W WO 2014007255 A1 WO2014007255 A1 WO 2014007255A1
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Prior art keywords
solar cell
current
voltage
failure
string
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PCT/JP2013/068153
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English (en)
Japanese (ja)
Inventor
隆文 石井
政宣 吉富
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Ｊｘ日鉱日石エネルギー株式会社
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Publication of WO2014007255A1 publication Critical patent/WO2014007255A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/02016—Circuit arrangements of general character for the devices
    • H01L31/02019—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02021—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/04—Constant-current supply systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to a solar cell inspection current control device that controls a solar cell inspection current.
  • the well-known failure of a solar power generation system that generates power using sunlight includes an open mode failure of a bypass diode and poor conduction inside the solar power generation system.
  • the solar cell is shielded by a shielding plate, and the thermal paper integrated with the shielding plate is used in the solar cell.
  • the temperature of the light shielding part is detected and the occurrence of hot spot heat (abnormal heat generation) is detected in the shielding part of the solar cell, it is determined that no current flows through the bypass diode, and the bypass diode fails in the open mode. What determines what is being done is known.
  • a measurement signal waveform is applied to the photovoltaic power generation system, and the response signal waveform and the measurement signal waveform are applied. Is known to detect the presence and location of poor continuity in a photovoltaic power generation system.
  • a diagnostic method described in Patent Document 3 below is known.
  • the charged capacitor is connected to the measurement target part excluding the blocking diode of the solar cell string and discharged, and the voltage and current of the measurement target part are measured during discharge. Then, based on the change in the IV characteristic obtained as a result, the failure of the measurement target part is diagnosed.
  • a conduction failure is determined by flowing current from the negative electrode of the solar cell to the positive electrode due to discharge of the capacitor, and conversely, an open mode failure of the bypass diode is determined by flowing current from the positive electrode to the negative electrode of the solar cell.
  • the degree of heat generation depends on the solar radiation intensity at that time, the light shielding state, the solar cell current density, the solar cell heat dissipation state, and the shunt resistance component of the solar cell. It is extremely difficult to distinguish between heat generation and heat generation due to a failure of the bypass diode. Therefore, there is a possibility that an open mode failure of the bypass diode cannot be accurately detected.
  • the present invention has been made in view of such problems, and provides a solar cell inspection current control device for safely, easily and accurately detecting a plurality of types of failures in a photovoltaic power generation system. For the purpose.
  • a solar cell inspection current control device includes a constant current device that maintains a constant current value using a variable resistor, and a voltage source device that is connected in series to the constant current device.
  • the current in the same direction as the current direction of the solar cell during power generation is controlled to be constant regardless of whether or not the solar cell is generating power.
  • a solar cell inspection current control device when the solar cell is not generating power, a voltage having a sign opposite to that of the solar cell during power generation is applied between the positive electrode and the negative electrode of the solar cell. A current of value is passed. On the other hand, at the time of power generation of the solar cell, the current flowing through the solar cell is controlled, and a current having a given value flows. That is, the current value during non-power generation and power generation of the solar cell can be maintained at a constant value.
  • a current having a constant current value from the negative electrode to the positive electrode is supplied to the solar cell module that is provided with at least one bypass diode and is disconnected from the load during non-power generation, Further, by measuring the potential difference generated between the negative electrode and the positive electrode of the solar cell module, a failure of the bypass diode can be detected based on the potential difference. This is because if the bypass diode is normal, the potential difference is almost the same as the voltage drop value of the bypass diode, and if the bypass diode is in open mode failure, the voltage drop value of the parasitic resistance of the solar cell module is generated. This is because it becomes larger than the voltage drop value of the bypass diode.
  • a current of a constant current value from the negative electrode to the positive electrode is supplied to the solar cell module in a non-power generation state in a disconnected state with respect to the load, By detecting the difference in the magnitude of the potential difference generated between the negative electrode and the positive electrode of the solar cell module, it is possible to easily and reliably determine whether or not the bypass diode has failed.
  • the conduction failure location when there is a conduction failure location inside the solar cell, when the solar cell generates power, the conduction failure location becomes a resistance and the voltage drops significantly compared to when there is no conduction failure. Therefore, according to the solar cell inspection current control device described above, the current value from the negative electrode to the positive electrode is controlled to a constant value by controlling the variable resistance for the solar cell module during power generation in a disconnected state with respect to the load. By measuring the potential difference generated between the negative electrode and the positive electrode of the solar cell module at that time, it is possible to easily and reliably determine the conduction failure of the solar cell.
  • an open mode failure of the bypass diode can be easily performed without using a large-scale device or a high-precision measuring device. Both continuity failures can be detected easily and reliably.
  • the failure detection method using a capacitor there is little possibility of a large current flowing through the solar cell module, and there is no need to scan the IV characteristics.
  • the above-described failure diagnosis of the failure of the bypass diode and the failure of the conduction failure can be performed without performing any special control while ensuring the safety at the time of inspection.
  • the current for inspecting the solar cell during non-power generation and during power generation can be controlled while ensuring safety.
  • FIG. 3 It is a block diagram which shows the solar energy power generation system which concerns on embodiment of this invention. It is a figure which shows the detailed structure of the solar cell string contained in the solar energy power generation system of FIG. It is a figure which shows the equivalent circuit of the photovoltaic cell of FIG. 3 is a graph showing current-voltage characteristics of the solar cell string of FIG. 2 during non-power generation. 3 is a graph showing current-voltage characteristics of the solar cell module of FIG. 2 during power generation. 3 is a graph showing current-voltage characteristics of the solar cell string of FIG. 2 during power generation. It is a block diagram which shows the current source circuit which concerns on embodiment of this invention. It is a graph which shows the current-voltage characteristic of the current source circuit of FIG.
  • 3 is a graph showing current-voltage characteristics of the solar cell string of FIG. 2 during non-power generation. 3 is a graph showing current-voltage characteristics of the solar cell string of FIG. 2 during power generation. It is a circuit block diagram which shows the current source circuit which concerns on embodiment of this invention. It is a figure which shows the IV characteristic at the time of connecting CRD which the electric current value shifted
  • FIG. 1 is a configuration diagram of a solar power generation system according to an embodiment of the present invention
  • FIG. 2 is a diagram illustrating a detailed configuration of a solar cell string included in the solar power generation system of FIG.
  • a solar power generation system 1 shown in FIG. 1 is a power generation system that uses solar energy to generate power.
  • the solar power generation system 1 is installed in a high place such as a roof and has a grid connection type having an output voltage of 200 V or more. Has been.
  • the solar power generation system 1 includes a solar cell array 100 and a power conditioner 110. Note that it is not necessary to limit to a grid-connected system, and an independent system independent (independent) from the power system may be used.
  • the solar cell array 100 converts solar energy into electric energy and supplies it to the power conditioner 110 as a DC output.
  • the solar cell array 100 includes at least one solar cell string 130 in which a plurality of solar cell modules 120 are connected in series.
  • the solar cell array 100 is configured by connecting three solar cell strings 130 to each other in parallel. These solar cell strings 130 are connected to the power conditioner 110 via a switch group of the failure detection system 2 described later.
  • the power conditioner 110 converts the DC output supplied from the solar cell array 100 into an AC output, and supplies the AC output to an electric power system (for example, a commercial electric power system) connected to the load device at the subsequent stage.
  • the power conditioner 110 has an operating voltage control function for controlling the operating voltage of the solar cell array 100 so that the maximum output of the solar cell array 100 can be obtained, and the system is safely stopped when an abnormality in the power system is detected. System protection function.
  • the power conditioner 110 may be a transformer insulation type having an insulation transformer or a transformerless (non-insulation) type.
  • the solar cell module 120 is configured in a panel shape and includes a plurality (six in this case) of solar cells 140 connected in series as shown in FIG. Moreover, the solar cell module 120 includes a bypass diode 150 connected in parallel to the plurality of solar cells 140 connected in series. That is, the anode terminal of the bypass diode 150 is connected to the negative electrode side of the solar cell module 120, and the cathode terminal of the bypass diode is connected to the positive electrode side of the solar cell module.
  • the solar cell module 120 may include a plurality of solar cell clusters including a plurality of solar cells 140 and bypass diodes 150 connected in parallel to them.
  • the plurality of solar cells 140 generate power using sunlight, and are fixed to an aluminum frame in a state of being arranged in a matrix, and the light receiving surface side is covered with tempered glass.
  • the solar cell 140 for example, a crystalline solar cell having an output voltage of 0.5V is used.
  • the bypass diode 150 is connected to the plurality of solar cells 140 in parallel.
  • a Schottky barrier diode is used in order to reduce the forward voltage and shorten the reverse recovery time.
  • the bypass diode 150 is provided such that a current flows when a reverse voltage is applied to the solar cell module 120, and its forward direction is the forward direction of the equivalent parasitic diode of the solar cell 140 in the solar cell module 120. On the other hand, it is the opposite direction.
  • the cathode side of the bypass diode 150 is connected to the positive electrode side of the solar cell module 120 on the electric circuit connecting the solar cell modules 120 in series.
  • the anode side of the bypass diode 150 is connected to the negative electrode side of the solar cell module 120 on the electric circuit.
  • FIG. 3 shows an equivalent circuit diagram of the solar battery cell 140.
  • the solar cell 140 can be considered equivalent to a parallel circuit of a current source 141, a parasitic diode 142, and a shunt resistor 143. That is, the solar cell 140 has a current source 141 that generates a current corresponding to the solar radiation intensity from the negative electrode to the positive electrode inside the cell 140, and a direction from the positive electrode to the negative electrode inside the cell 140 as a forward direction.
  • This is equivalent to a parasitic diode 142 and a shunt resistor 143 having a resistance value of several hundred to 1 k ⁇ (ideally infinite ⁇ ).
  • the failure detection system 2 targets the solar cell string 130 that is switched to the disconnected state with respect to the load device including the power conditioner 110, and the failure of the bypass diode 150 built in the solar cell string 130 and the solar cell string 130. It is an apparatus group for detecting a conduction failure. Specifically, the failure detection system 2 includes switch groups (switching units) 3 and 4 and a failure detection device 5.
  • the switch group 3 is provided for switching the connection between the three solar cell strings 130 and the power conditioner 110 to the disconnected state at the time of failure inspection, and includes six switching elements 31A, 31B, 32A, 32B, 33A, 33B.
  • the switching elements 31 ⁇ / b> A, 31 ⁇ / b> B, 32 ⁇ / b> A, 32 ⁇ / b> B, 33 ⁇ / b> A, 33 ⁇ / b> B are switches that control the electrical connection between the solar cell string 130 and the power conditioner 110.
  • any configuration can be used as long as it cuts off the current.
  • An electromagnetic switch such as a semiconductor switch or a mechanical relay can be used.
  • the switching elements 31A, 31B, 32A, 32B, 33A, and 33B are closed during normal time (during power generation), and connect the solar cell string 130 and the power conditioner 110 to each other while being open during failure inspection. And let them be disconnected from each other.
  • the switching elements 31A, 32A, and 33A are provided on an electric circuit that connects between the positive electrode of each solar cell string 130 and one input terminal of the power conditioner 110, and the switching elements 31B, 32B, and 33B. Is provided on an electric circuit that connects between the negative electrode of each solar cell string 130 and the other input terminal of the power conditioner 110.
  • the switch group 3 is provided on both electric circuits connected to the positive electrode and the negative electrode of the solar cell string 130, it may be provided only on one of the electric circuits.
  • the switch group 3 may be composed of only the switching elements 31A, 32A, and 33A. Even in such a configuration, the solar cell string 130 and the power conditioner 110 can be disconnected from each other at the time of failure inspection.
  • the switch group 4 is provided to electrically connect the three solar cell strings 130 and the failure detection device 5 at the time of failure inspection, and includes six switching elements 41A, corresponding to the number of solar cell strings 130, 41B, 42A, 42B, 43A, 43B.
  • the switching elements 41A, 41B, 42A, 42B, 43A, and 43B are switches that control the electrical connection between the solar cell string 130 and the failure detection device 5, and are the same semiconductor switches and electromagnetic switches as the switch group 3. Can be adopted.
  • the switching elements 41A, 41B, 42A, 42B, 43A, and 43B are normally opened (during power generation), and the failure detection device 5 is electrically disconnected from the solar cell string 130 while bypass diode inspection is performed. Sometimes they are closed and they are connected to each other.
  • the switching elements 41A, 42A, 43A are provided on an electric circuit that connects between the positive electrode of each solar cell string 130 and one connection terminal of the failure detection device 5, and the switching elements 41B, 42B, 43B. Are provided on the electric circuit connecting between the negative electrode of each solar cell string 130 and the other connection terminal of the failure detection device 5.
  • the switch group 4 is provided on both the electric circuits connected to the positive electrode and the negative electrode of the solar cell string 130, it may be provided only on one of the electric circuits.
  • the switch group 4 may be configured only from the switching elements 41A, 42A, and 43A. Even with such a configuration, the solar cell string 130 and the failure detection device 5 can be disconnected from each other at normal times.
  • a backflow prevention diode (not shown) that prevents a reverse current from flowing through the solar cell string 130 is provided between the solar cell string 130 and the power conditioner 110. (Both poles) are connected in series on the electric circuit.
  • the backflow prevention diode may be configured to be located in the electric circuit to be measured by the failure detection device 5 or may be configured to be located outside the electric circuit to be measured. In other words, regardless of the position of the switch group 3 or the position of the connection points 61 to 66 with the failure detection device 5, it is located anywhere on the electric circuit connecting the positive electrode (or negative electrode) of the solar cell string and the power conditioner 110. (However, it is necessary to be located closer to the solar cell string 130 than the parallel connection point with the other solar cell strings 130).
  • the failure detection device 5 includes a current source circuit 51 (a solar battery inspection current control device), a voltage measurement unit 52, a control / determination unit 53, a switch 54, a current measurement unit 551, and a switch 552.
  • the current source circuit 51 is a circuit that generates a constant current having a specified current value. Both terminals of the current source circuit 51 pass through three switching elements 41A, 42A, 43A and switching elements 41B, 42B, 43B, respectively.
  • the battery string 130 can be connected to the positive electrode and the negative electrode.
  • the current value of the current generated by the current source circuit 51 can be adjusted by control by the control / determination unit 53. With such a current source circuit 51, a current having a predetermined current value from the negative electrode to the positive electrode is supplied to any one of the three solar cell strings 130.
  • the voltage measuring unit 52 is a circuit unit for measuring a potential difference between the negative electrode and the positive electrode of the solar cell string 130, and both terminals thereof are respectively switching elements 41A, 42A, 43A and switching elements 41B, 42B, It is possible to connect to the positive and negative electrodes of the three solar cell strings 130 via 43B.
  • the measurement timing of the potential difference by the voltage measurement unit 52 can be controlled by the control / determination unit 53, and a signal indicating the potential difference measured by the voltage measurement unit 52 can be acquired by the control / determination unit 53.
  • Such a voltage measurement unit 52 measures the potential difference in any of the three solar cell strings 130.
  • the control / determination unit 53 performs control so as to switch the open / close state of the switch groups 3 and 4 and the switch 54 at the time of failure inspection of the bypass diode and continuity failure, and acquires the potential difference measured by the voltage measurement unit 52. To do. Then, the control / determination unit 53 detects a failure of the bypass diode 150 incorporated in any of the solar cell strings 130 and a conduction failure of the solar cell string 130 based on the acquired potential difference, and outputs a detection result.
  • control / determination unit 53 determines whether or not the solar cell string 130 connected for inspection is generating power. Specifically, the control / determination unit 53 opens the switch 54 for disconnecting the current source circuit 51 so that no constant current flows, and closes the switch 552 for short-circuiting the solar cell string 130. Then, the short-circuit current value is measured by the ammeter 551, and it is determined whether or not the solar cell string 130 is generating power by comparing it with the specified value. For example, the control / determination unit 53 compares the measured short-circuit current value with a specified value and determines whether or not power generation is being performed.
  • the solar cell string 130 by the constant current ratio of I 1 may be described later and the short-circuit current I SC is determined whether the during power generation. For example, if I SC / I 1 > ⁇ , it may be determined that power is being generated (daytime), and if I SC / I 1 ⁇ , it is determined that power is not being generated (nighttime).
  • a control / determination unit 53 may be configured by a circuit unit such as an analog circuit or a digital circuit, or may be configured by an information processing apparatus such as a microcomputer.
  • the current measuring unit 551 measures the current flowing through the solar cell string 130 connected for inspection according to the instruction signal from the control / determination unit 53.
  • FIG. 4 (a) is a graph showing the IV characteristics of the solar cell string 130 at night (at low solar radiation intensity), and FIG. 4 (b) shows one of the IV characteristics of FIG. 4 (a). It is a graph which shows a part in detail.
  • L1 indicates the IV characteristic of the solar cell string 130 when it is normal
  • L2 indicates the IV characteristic of the solar cell string 130 when the bypass diode fails.
  • V> 0 a positive voltage
  • I> 0 Current
  • the solar cell string 130 includes a plurality of bypass diodes 150 in a forward direction from the negative electrode inside to the positive electrode, when a positive current (I> 0) is generated at night at normal time, Since almost no current flows through the shunt resistor 143 (FIG. 3) of the solar cell 140, most of the current flows forward through the bypass diode 150. As a result, the voltage V across the solar cell string 130 increases. However, it hardly changes in the vicinity of 0V.
  • the control / determination unit 53 determines the failure of the bypass diode 150 included in the solar cell string 130 using the IV characteristics of the solar cell string described above. Specifically, the control / determination unit 53 controls the switch group 3 so that the gap between any one of the solar cell strings 130 to be inspected (hereinafter also referred to as detection target strings) and the power conditioner 110. At the same time as setting the disconnected state, the switch group 4 is controlled to connect the detection target string 130 to the current source circuit 51 and the voltage measurement unit 52 of the failure detection device 5.
  • control / determination unit 53 controls the pair of switching elements 31A and 31B, the pair of switching elements 32A and 32B, or the pair of switching elements 33A and 33B to be in an open state, and correspondingly The pair of switching elements 41A and 41B, the pair of switching elements 42A and 42B, or the pair of switching elements 43A and 43B is controlled to be closed.
  • the control / determination unit 53 closes the switch 54, controls the current source circuit 51, and determines the average short-circuit current value I SC at night from the negative electrode to the positive electrode of the detection target string 130. generating an even higher current value I 1 of the current. Further, the control / determination unit 53 determines whether or not the potential difference of the detection target string 130 measured by the voltage measurement unit 52 is larger than a predetermined threshold value V TH0, and detects when the potential difference is larger than the threshold value V TH0. A failure of any bypass diode 150 included in the target string 130 is detected. By such a function of the control / determination unit 53, it is possible to determine which of the characteristics L1 and L2 shown in FIG.
  • the IV characteristic of the detection target string 130 is, and the IV characteristic is a characteristic.
  • control / determination unit 53 determines that the potential difference of the detection target string 130 measured by the voltage measurement unit 52 when the current of the current value I 1 is supplied to the detection target string 130 is a predetermined threshold V TH1.
  • the current source circuit 51 performs control so as to stop the supply of current to the detection target string 130.
  • the control / determination unit 53 starts monitoring the potential difference of the detection target string 130 at the timing when the open / close state of the switch groups 3 and 4 is switched for the failure inspection of the bypass diode, and according to the monitoring result Thus, it is continuously determined whether or not the supply of current to the detection target string 130 is stopped.
  • the control / determination unit 53 of the failure detection device 5 determines whether or not a predetermined time has arrived by using a built-in timing function, and checks for a failure of the bypass diode at the timing when the arrival of the predetermined time is detected. Processing begins. For example, since the very small the I-V characteristic short-circuit current value I SC of the solar cell string 130 at the timing of arrival of night time is detected is stable, bypassed by the fault test process is started at this timing False detection of a diode failure is prevented.
  • the switch groups 3 and 4 are controlled by the control / determination unit 53 to set the disconnection state between any one of the detection target strings 130 and the power conditioner 110, and at the same time, the detection target string 130.
  • the failure detection device 5 are connected.
  • both poles of the detection target string 130 may be cut, or only one side of the detection target string 130 may be cut.
  • the control / determination unit 53 of the failure detection device 5 determines whether the detection target string 130 is generating power or not generating power, and the following processing is started when the string is not generating power.
  • the failure inspection process is stopped, and the detection target string 130 is disconnected from the failure detection device 5 and connected to the power conditioner 110.
  • a current having a current value I 1 is supplied from the negative electrode to the positive electrode from the current source circuit 51 of the failure detection device 5 to the detection target string 130.
  • the voltage measurement unit 52 measures the potential difference between the negative electrode and the positive electrode of the detection target string 130 and passes the measurement value to the control / determination unit 53.
  • the control / determination unit 53 determines whether or not the measured value of the potential difference is larger than the specified threshold value V TH0, and any bypass diode included in the detection target string 130 based on the determination result. 150 faults are detected. Then, the control / determination unit 53 outputs the detection result to an output device such as a display or an LED.
  • control / determination unit 53 controls the switch groups 3 and 4 to detect the detection target string 130 and the failure detection. At the same time as the connection with the device 5 is released, the connection between the detection target string 130 and the power conditioner 110 is set to the connected state.
  • the prescribed current value I from the negative electrode to the positive electrode is applied to the solar cell string 130 in the disconnected state with respect to the load device. 1 is supplied, a potential difference generated between the negative electrode and the positive electrode of the solar cell string 130 is measured at that time, and a failure of the bypass diode 150 is detected based on the potential difference. That is, if the bypass diode 150 is normal, the potential difference is almost the same as the voltage drop value of the bypass diode 150. If the bypass diode 150 is in an open mode failure, the voltage drop value of the parasitic resistance of the solar cell 140 is generated. Therefore, the potential difference becomes larger than the voltage drop value of the bypass diode 150.
  • the presence or absence of a failure of the bypass diode 150 can be determined with high accuracy by detecting the difference in the magnitude of the potential difference.
  • the potential difference in the constant current state there is little risk of flowing a large current through the solar cell string, and there is no need to scan the IV characteristics as in the conventional failure detection method using a capacitor.
  • the failure of the bypass diode 150 can be detected easily and accurately while ensuring the safety during the inspection.
  • a failure of the bypass diode 150 is detected when the potential difference measured with respect to the solar cell string 130 is larger than the threshold value V TH0, so that the failure of the bypass diode 150 is detected with simple processing and circuit configuration. Can be detected.
  • the current value I 1 supplied to the solar cell string 130 at the time of inspection is larger than the average short-circuit current value I SC of the solar cell string 130 at night, bypass is performed regardless of the power generation state of the solar cell string 130.
  • a failure of the diode 150 can be detected with high accuracy.
  • the supply of current to the solar cell string 130 is stopped when the potential difference measured with respect to the solar cell string 130 becomes equal to or greater than the threshold value VTH1 , applying a high voltage to the solar cell string 130 at the time of failure inspection The failure of the solar cell string 130 due to can be prevented. That is, if a constant current larger than the short-circuit current is passed through the solar cell string 130, a high voltage in the opposite direction to the voltage generated during power generation in the solar cell string 130 may be generated. The generation of such a high voltage can be prevented by stopping the supply of current when becomes too large.
  • FIG. 5 is a graph showing the IV characteristics of the solar cell module 120 during the daytime (during power generation).
  • L3 indicates the IV characteristics of the solar cell module 120 without conduction failure
  • L4 indicates the IV characteristics of the solar cell module 120 with conduction failure.
  • a positive voltage V> 0
  • V> 0 a positive voltage
  • I> 0 Current
  • the open circuit voltage does not change unless it is completely disconnected.
  • the voltage decreases according to the characteristics of a normal solar cell as shown in the characteristic L3 of FIG. If there is a continuity failure in the solar cell module 120, the continuity failure location becomes a resistance, and the voltage drops significantly as shown by the characteristic L4 in FIG. Note that as the current is increased, the voltage of the solar cell module 120 including the conduction failure portion drops to 0V. However, even if the current is increased further, the bypass diode 150 is activated, and therefore, it does not fall below 0 V (more precisely, the voltage drop due to the bypass diode 150).
  • FIG. 6A is a graph showing the IV characteristics of the solar cell string 130 during the daytime (during power generation).
  • the graph shown in FIG. 6A is a series composition of IV characteristics of the solar cell modules 120 included in the solar cell string 130.
  • L3 represents the IV characteristics of the solar cell string 130 without conduction failure
  • L4 represents the IV characteristics of the solar cell string 130 with conduction failure.
  • the open circuit voltage V OC does not change as long as there is no complete disconnection, regardless of whether or not there is a conduction failure point in the solar cell string 130.
  • the solar cell string 130 when the solar cell string 130 is shed little current I 1 as compared to the power available current, if the normal conduction of the solar cell string 130, Fig. 6 (a) According to the characteristic L3, the voltage hardly decreases according to the characteristics of a normal solar cell. On the other hand, if there is a conduction failure in the solar cell string 130, the conduction failure portion becomes a resistance, and the characteristic L4 in FIG. As a result, the voltage is remarkably lowered as compared with the characteristic L3 ( ⁇ V).
  • FIG. 6B is an enlarged view of the graph in the vicinity of the open circuit voltage V OC in the graph shown in FIG.
  • a voltage at a current I 1 in the characteristic L3 V 1 the difference between the open circuit voltage V OC and V 1 [Delta] V 1, at a current I 1 in the characteristics L4
  • the voltage is V 2
  • the difference between the open circuit voltages V OC and V 2 is ⁇ V 2 .
  • the voltage decreases by ⁇ V 1 in the characteristic L3
  • the voltage decreases by ⁇ V 2 that is much larger than ⁇ V 1 in the characteristic L4. To do.
  • the control / determination unit 53 determines the conduction failure of the solar cell string 130. Specifically, the control / determination unit 53 controls the switch group 3 so that the gap between any one of the solar cell strings 130 to be inspected (hereinafter also referred to as detection target strings) and the power conditioner 110. At the same time as setting the disconnected state, the switch group 4 is controlled to connect the detection target string 130 to the current source circuit 51 and the voltage measurement unit 52 of the failure detection device 5.
  • control / determination unit 53 controls the pair of switching elements 31A and 31B, the pair of switching elements 32A and 32B, or the pair of switching elements 33A and 33B to be in an open state, and correspondingly The pair of switching elements 41A and 41B, the pair of switching elements 42A and 42B, or the pair of switching elements 43A and 43B is controlled to be closed.
  • the control / determination unit 53 first opens the switch 54 to disconnect the current source circuit 51 to open the knowledge target string 130 and then controls the voltage measurement unit 52 to control the detection target string.
  • the open circuit voltage V OC which is the potential difference between the negative electrode 130 and the positive electrode 130 is measured.
  • the control / determination unit 53 closes the switch 54 and connects the current source circuit 51 to the detection target string 130, and then controls the current source circuit 51, so that the detection target string 130 is connected between the negative electrode and the positive electrode. (Eg, from the negative electrode to the positive electrode), a current I 1 is generated.
  • the control / determination unit 53 controls the voltage measurement unit 52 so that the current source circuit 51 controls the current I 1 to be the potential difference between the negative electrode and the positive electrode of the detection target string 130. Let the voltage be measured. Further, the control / determination unit 53 calculates a voltage change value ⁇ V that is a difference between the open-circuit voltage V OC of the detection target string 130 measured by the voltage measurement unit 52 and the constant current voltage, and the voltage change value ⁇ V is defined. determines the greater or not than the threshold V TH2, detects the conduction failure detection target string 130 when the voltage change value ⁇ V greater than the threshold V TH2.
  • the control / determination unit 53 By such a function of the control / determination unit 53, it is possible to determine whether the IV characteristic of the detection target string 130 is the characteristic L3 or L4 shown in FIG. 6, and the IV characteristic is the characteristic. When it is determined that it is L4, a conduction failure can be detected. If the current I 1 is larger than the short-circuit current during the daytime (during power generation) of the detection target string 130, the voltage drops by the bypass diode 150. On the other hand, if the current I 1 is too small, ⁇ V is small and detection is uncertain.
  • the control / determination unit 53 of the failure detection device 5 determines the arrival of a predetermined time using the built-in timing function.
  • the control / determination unit 53 controls the switch groups 3 and 4 to set the disconnection state between any one of the detection target strings 130 and the power conditioner 110.
  • the detection device 5 is connected.
  • both poles of the detection target string 130 may be cut, or only one pole side of the detection target string 130 may be cut.
  • the control / determination unit 53 of the failure detection device 5 determines whether the detection target string 130 is generating power or not generating power, and starts the following process when generating power.
  • the power generation amount is equal to or less than a given value
  • the conduction failure detection process is stopped, the detection target string 130 is disconnected from the failure detection device 5, and connected to the power conditioner 110.
  • the voltage measuring unit 52 measures the open circuit voltage V OC of the detection target string 130. Thereafter, the current I 1 is supplied from the current source circuit 51 of the failure detection device 5 to the detection target string 130 between the negative electrode and the positive electrode (for example, from the negative electrode to the positive electrode). At this timing, the voltage measurement unit 52 measures the constant-current voltage of the detection target string 130 and passes the measurement value to the control / determination unit 53. On the other hand, the control / determination unit 53 calculates a voltage change value ⁇ V that is a difference between the measured open-circuit voltage V OC and the measured constant current voltage, and the voltage change value ⁇ V is a predetermined threshold value V TH2. It is determined whether the detection target string 130 is defective or not based on the determination result.
  • control / determination unit 53 outputs the detection result to an output device such as a display or an LED. Finally, if no continuity failure is detected, the control / determination unit 53 controls the switch groups 3 and 4 to simultaneously release the connection between the detection target string 130 and the failure detection device 5. The connection between the detection target string 130 and the power conditioner 110 is set.
  • An open circuit voltage V OC which is a potential difference with the positive electrode, is measured.
  • a constant current voltage which is a potential difference between the negative electrode and the positive electrode of the solar cell string 130 when a current having a specified current value is supplied between the negative electrode and the positive electrode (for example, from the negative electrode toward the positive electrode). Is measured. Then, based on the difference ⁇ V between the measured open circuit voltage and constant current voltage, the conduction failure of the solar cell string 130 is determined.
  • the conduction failure of the solar cell string 130 can be accurately determined by detecting the difference between the open circuit voltage and the constant current voltage.
  • electrical_connection defect of the solar cell string 130 can be detected easily and correctly, ensuring the safety
  • the control / determination unit 53 determines that the difference ⁇ V between the open-circuit voltage V OC and the constant-current voltage measured when the specified current I 1 is supplied to the solar cell string 130, If it is greater than the threshold value V TH2, the conduction failure of the solar cell string 130 may be determined. By doing so, it is possible to detect a conduction failure of the solar cell string 130 with simple processing and circuit configuration by performing a binary determination of comparing the measured difference ⁇ V and the threshold value V TH2 .
  • FIG. 7 is a configuration diagram of the current source circuit 51.
  • the current source circuit 51 includes a constant current device 511 and a voltage source device 512, and the constant current device 511 and the voltage source device 512 are connected in series.
  • the current source circuit 51 is a circuit that controls the current flowing through the solar cell string 130 to be detected to a constant current having a specified value regardless of the power generation state.
  • the voltage source device 512 are controlled to generate a constant current having a current value suitable for inspection of a failure of the bypass diode in the solar cell (solar cell string 130).
  • the current source circuit 51 generates a constant current having a current value suitable for inspecting a continuity failure in the solar cell (solar cell string 130) by controlling the current value with the constant current device 511. . That is, the solar cell inspection current control device according to the present embodiment can perform two inspections, that is, a failure inspection of the bypass diode in the solar cell and a conduction failure inspection in the solar cell with one device.
  • the constant current device 511 changes the resistance (or internal resistance) to change the current flowing through the solar cell string 130 to a predetermined constant current value (for example, the above-mentioned I 1 ).
  • a predetermined constant current value for example, the above-mentioned I 1 .
  • the constant current device 511 any configuration can be used as long as the current is controlled to a constant current.
  • the constant current device 511 can be configured by an electric circuit using an operational amplifier, a transistor, a constant current diode, or the like. .
  • the voltage source device 512 is a device that supplies DC power to the solar cell string 130 connected for inspection, and supplies power regardless of whether the solar cell string 130 is generating power.
  • the electric power supplied from the voltage source device 512 is supplied into the solar cell string 130 during non-power generation (nighttime) and used to detect a failure of the bypass diode, and during constant power generation (511) during power generation (daytime). Is consumed by the resistance.
  • the voltage source device 512 can have any configuration as long as it generates DC power.
  • the voltage source device 512 can include a voltage source such as a DC power supply circuit or a dry battery.
  • the upper limit of the voltage value that can be supplied by the voltage source device 512 is set to V 3 (see FIG. 8A), and no more voltage is generated. it may be configured as a constant voltage source V 3.
  • voltage source device 512 is described as always supplying power when connected to solar cell string 130, but non-power generation of solar cell string 130 according to an instruction signal from control / determination unit 53.
  • the signs of current and voltage are determined as follows, as in the case of the above-described bypass diode failure inspection and continuity failure failure inspection. That is, when the potential increases from the negative electrode toward the positive electrode inside the solar cell string 130 (solar cell) (when the potential increases from the positive electrode toward the negative electrode outside the solar cell), the positive voltage (V> 0) is obtained. In the solar cell string 130, a current from the negative electrode to the positive electrode (current from the positive electrode to the negative electrode outside the solar cell) is indicated by a positive current (I> 0). Therefore, the total voltage of the closed circuit including the solar cell string 130 and the current source circuit 51 becomes zero.
  • the current value is the same, the voltage has the same absolute value, and the sign is reversed. That is, the voltage gain generated in the solar cell string 130 (or voltage loss due to the bypass diode 150) is balanced with the voltage drop (or voltage gain) due to the current source circuit 51.
  • FIG. 8A is a graph showing a characteristic L5 that is an IV characteristic of the current generated by the current source circuit 51.
  • a region where the voltage is positive is a region representing an operation in which the current source circuit 51 sends power to the solar cell string 130 to be measured as a power source. Show.
  • the operation mode when detecting an open failure of the bypass diode 150 at night is a region where this voltage is positive.
  • regions where the voltage is negative indicate regions where the current source circuit 51 operates as a load.
  • the operating mode when the current source circuit 51 passes a small amount of current through the solar cell string 130 that generates power in the daytime and diagnoses the conduction failure of the solar cell string 130 is a region where the voltage is negative.
  • the current source circuit 51 passes a constant current having a current value I 1 between the voltage 0 V and the voltage V 3 (V 3 > 0), and does not supply power above the voltage V 3 .
  • the current source circuit 51 is desirably provided with a blocking diode for preventing reverse current.
  • (V 5 > V 3 ) of the blocking diode By setting the withstand voltage
  • FIG. 8B is a graph showing the IV characteristics of the solar cell string 130 at night and during normal time.
  • the characteristic L1 in FIG. 8B shows the normal IV characteristic of the solar cell string 130 at night, and corresponds to the characteristic L1 in FIG.
  • the characteristic L3 in FIG. 8B shows the IV characteristic during normal daytime of the solar cell string 130, and corresponds to the characteristic L3 in FIG. Points A and B in FIG. 8 (b), a point corresponding to the current value I 1 of each characteristic L1 and L3.
  • the failure detection system 2 detects the failure of the bypass diode based on the potential difference at the point A, and the failure of the continuity failure based on the potential difference at the point B. Is detected.
  • the current / voltage at points A and B in FIG. 8B is the point A shown in FIG. 8A.
  • B current / voltage As is, in FIG. 8A, the current source circuit 51 detects a failure of the bypass diode at the point A and detects a failure of conduction failure at the point B.
  • FIG. 9 is a graph showing the nighttime IV characteristics of the solar cell string 130 as in FIG. The same as in the characteristics L1, L2 and Figure 4 for the current I 1, the description thereof is omitted.
  • ⁇ V B indicates the total voltage drop value of the bypass diode 150 in the solar cell string 130.
  • the characteristic L5 is the IV characteristic of the current generated by the current source circuit 51
  • FIG. 9 is a graph showing the IV characteristic in the solar cell string 130. Therefore, the current source circuit 51 shown in FIG. With respect to the IV characteristic of the current generated by the voltage, the voltage is displayed in reverse.
  • the solar cell string 130 that receives power on the positive voltage side of the graph of FIG. 8A operates on the negative voltage side of FIG.
  • the voltage V 3 that can be generated needs to be a value larger than ⁇ V B shown in FIG. 9 (requirement 1).
  • the solar cell string 130 shown in FIG. 2 is configured by connecting 90 solar cell modules 120 (solar cell modules configured by one cluster) in series, 90 clusters and Become.
  • FIG. 10 is a graph showing the daytime IV characteristics of the solar cell string 130 as in FIG.
  • the characteristics L3 and L4, the current I 1 and the voltage V OC are the same as in FIG.
  • the characteristic L5 is the same as that in FIG.
  • the solar cell string 130 that receives power on the negative voltage side of the graph of FIG. 8A operates on the positive voltage side of FIG.
  • the continuity state is determined from V OC and the potential difference at point B and the difference in potential difference at point B ′ when current is passed. Reflect. From the above, the absorbable voltage V 4 needs to be a value larger than V OC shown in FIG. 10 (requirement 2).
  • withstand voltage is the voltage V 5 of FIG. 8 (a).
  • the withstand voltage shown in FIG. 8A needs to be equal to or higher than the open circuit voltage of the solar cell string 130 (requirement 4).
  • Constant current value I 1 of the current source circuit 51 is generated, from the viewpoint of the bypass diode fault diagnosis is required to be a sufficiently large value in comparison with the current due to nighttime light intensity (Requirement 5 Part 1). Otherwise, the determination becomes difficult.
  • a current source circuit 51 in which a constant current value I1 is set to 1 mA is applied to a solar cell string 130 that generates a small amount of power due to the influence of a streetlight at night (i.e., generates power with a short circuit current of about 1 mA).
  • the constant current value I 1 which is a current source circuit 51 When connected, the operating voltage of the solar cell string 130 is around 0 V, so even if the bypass diode 150 has an open failure, the voltage drop cannot be measured and the failure cannot be detected.
  • the constant current value I 1 which is a current source circuit 51 generates, from the the viewpoint of diagnosis of poor conduction, it must be a sufficiently small value compared to the current during the day (Requirement 5 Part 2).
  • the constant current value I 1 generated by the constant current source circuit 51 is larger than the average short-circuit current value of the solar battery string 130 at night and smaller than the average maximum operating point current Ipm during the daytime. It is desirable.
  • the above are the requirements 1 to 5 for executing the above-described failure inspection of the bypass diode and the failure inspection of the continuity failure with respect to the IV characteristics of the current generated by the current source circuit 51.
  • the current source circuit 51 satisfies at least requirements 1 and 2.
  • FIG. 11 is a diagram illustrating an example of a circuit configuration diagram of the current source circuit 51.
  • the voltage source device 512 is configured by an element formed by connecting a constant voltage source 513 and a bypass diode 516 in parallel, and the constant current device 511 includes a constant current diode (CRD (Current Regulative Diode)) 514 and a Zener diode 515.
  • CRD Current Regulative Diode
  • the CRD is a passive device that maintains a constant current even if the applied voltage or load resistance changes.
  • the constant current source can be manufactured inexpensively and easily. can do.
  • a blocking diode (backflow prevention diode) 517 is directly connected to the constant current device 511 and the voltage source device 512.
  • circuit configuration diagram of the current source circuit 51 shown in FIG. 11 shows conditions necessary for satisfying the above requirements 1 to 5.
  • the constant voltage source 513 is generated in order to satisfy the requirement 1, that is, to make the voltage V 3 that can be generated larger than the total voltage drop value ⁇ V B of the bypass diode 150 in the solar cell string 130.
  • the voltage may be set to a value larger than the total voltage drop value ⁇ V B.
  • a condition that satisfies requirement 2 that is, a condition for setting the absorbable voltage V 4 to a value larger than the open circuit voltage V OC will be described.
  • the constant current diode 514 needs to withstand the total voltage of the constant voltage source 513 and the solar cell, step down the voltage, and control the current. is there. Since the withstand voltage of the constant current diode 514 is 100 V or less, it is necessary to secure a withstand voltage by connecting a plurality of constant current diodes 514 in series. However, actually, the withstand voltage is not ensured only by connecting a plurality of constant current diodes 514 in series.
  • FIG. 12 is a diagram showing IV characteristics when CRDs having different current values are connected in series.
  • a region R1 is a region that may be damaged due to voltage concentration.
  • FIG. 13 is a diagram showing the effect of parallel connection of a CRD and a Zener diode.
  • a characteristic L10 indicates the IV characteristic of the CRD as in FIG. 12
  • a characteristic L11 indicates the IV characteristic of the Zener diode
  • a characteristic L12 indicates the IV characteristic due to the parallel connection of the CRD and the Zener diode.
  • the region R2 indicates a stable operation region.
  • the Zener diode 515 that operates below the withstand voltage is connected in parallel to all the constant current diodes 514, thereby eliminating the region R1 that may be damaged due to voltage concentration.
  • FIG. 14A shows an example of the IV characteristics L20 to L22 of the three constant current elements
  • FIG. 14B shows the IV characteristics when the three constant current elements are connected in series. It is a figure which shows the example of.
  • a Zener diode 515 that can pass a short-circuit current of a solar cell is used, and a bypass diode 516 that can pass a short-circuit current of the solar cell is connected in parallel to the constant voltage source 513. It is preferable to keep it.
  • a blocking diode 517 having a sufficient withstand voltage may be connected in series to a constant current source including a constant voltage source 513 and a constant current element. This blocking diode 517 is necessary in order not to cause an accident even if the solar cell is connected in reverse polarity due to construction errors or the like.
  • the circuit configuration diagram of the current source circuit 51 shown in FIG. 11 satisfies the above requirements 1 to 5 and can be realized only with inexpensive general-purpose parts, and does not require control of switching elements.
  • the configuration is simple. Therefore, the operation is simple, there is no possibility of instability due to the problem of the gate drive, etc., a stable current can be reliably obtained, and the failure inspection of the solar cell can be reliably performed.
  • the constant current device includes a plurality of elements formed by connecting a constant current diode and a Zener diode in parallel.
  • the current control device for solar cell inspection can be realized with only inexpensive general-purpose components and has a simple configuration compared to a current source using an FET or the like, such as no need to control a switching element. Therefore, the operation is simple, there is no possibility of instability due to the problem of the gate drive, etc., a stable current can be reliably obtained, and the failure inspection of the solar cell can be reliably performed.
  • the voltage source device is preferably a constant voltage source.
  • a voltage source as a constant voltage source and a constant current device, it is possible to generate a high reverse voltage while realizing a constant current to flow through the solar cell during non-power generation. It becomes possible to prevent it in advance and protect it from damage to the solar cell.
  • the voltage source device applies a voltage larger than the absolute value of the sum of the voltage drop values at the normal time of the bypass diode in the solar cell as the absolute value of the voltage applied between the positive electrode and the negative electrode of the solar cell. Is also suitable.
  • a voltage that is equal to or higher than the voltage drop value of the bypass diode it is possible to surely flow a current into the solar cell, and the failure of the bypass diode described above Diagnosis can be performed reliably.
  • the positive and negative withstand voltages of the solar cell inspection current control device are larger than the open-circuit voltage value of the solar cell.
  • the voltage that can be generated by the solar cell inspection current control device reaches the open voltage value of the solar cell, so the positive withstand voltage is higher than the open voltage value of the solar cell.
  • the potential difference generated between the negative electrode and the positive electrode of the solar cell module necessary for performing failure diagnosis of a failure due to poor conduction is a value less than the open circuit voltage value. Therefore, since the negative withstand voltage is larger than the open-circuit voltage value of the solar cell, it is possible to reliably perform failure diagnosis of failure of conduction failure.
  • the present invention uses a solar cell inspection current control device for controlling a current for inspecting a solar cell, and can detect a plurality of types of failures in a photovoltaic power generation system safely, easily and accurately. It is.
  • SYMBOLS 1 Solar power generation system (solar cell system), 2 ... Failure detection system, 3 ... Switch group (switching part), 5 ... Failure detection apparatus, 51 ... Current source circuit, 52 ... Voltage measurement part, 53 ... Control / determination , 54 ... switch, 551 ... ammeter, 61-66 ... connection point, 100 ... solar cell array, 110 ... power conditioner (load device), 120 ... solar cell module, 130 ... solar cell string (string to be detected) , 140 ... solar cells, 150 ... bypass diode, 511 ... constant current device, 512 ... voltage source device, 513 ... constant voltage source, 514 ... constant current diode, 515 ... zener diode, 516 ... bypass diode, 517 ... blocking diode. .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Photovoltaic Devices (AREA)

Abstract

La présente invention porte sur un circuit de source de courant (51) qui comporte un appareil à courant constant (511), qui maintient une constante de valeur de courant au moyen d'une résistance variable, et un appareil de source de tension (512) connecté en série à l'appareil à courant constant (511), et indépendamment du fait qu'une cellule solaire génère une puissance ou non, le circuit de source de courant commande constant un courant circulant dans la direction égale à la direction de courant obtenue lorsque la cellule solaire génère une puissance. L'appareil à courant constant (511) peut être configuré à partir d'une pluralité d'éléments formés par connexion d'une diode de régulation de courant (514) et d'une diode Zener (515) en parallèle l'une avec l'autre.
PCT/JP2013/068153 2012-07-03 2013-07-02 Appareil de commande de courant pour inspection de cellule solaire WO2014007255A1 (fr)

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Cited By (1)

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JP2017163805A (ja) * 2016-03-11 2017-09-14 オムロン株式会社 太陽電池の故障検出装置および太陽光発電システム

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JP2015188306A (ja) * 2014-03-13 2015-10-29 石川県 太陽電池回路の検査装置及び検査方法
JP6446900B2 (ja) * 2014-08-06 2019-01-09 オムロン株式会社 太陽光発電システムの検査装置および太陽光発電システムの検査方法
JP6821477B2 (ja) * 2017-03-14 2021-01-27 日置電機株式会社 太陽電池検査装置および太陽電池検査方法
JP6595540B2 (ja) * 2017-08-25 2019-10-23 ルナライト株式会社 点灯回路、及び信号装置

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JPS58175925A (ja) * 1982-04-08 1983-10-15 三菱電機株式会社 太陽光発電システムの故障検出方式
JP2001174530A (ja) * 1999-12-15 2001-06-29 Maki Mfg Co Ltd 太陽電池の特性測定装置
JP2005253171A (ja) * 2004-03-03 2005-09-15 Yamatake Corp 定電流源回路とその制御方法
JP2013080745A (ja) * 2011-09-30 2013-05-02 Mitsubishi Electric Corp 太陽光発電システム及び太陽光発電管理システム
WO2013115236A1 (fr) * 2012-01-30 2013-08-08 Ｊｘ日鉱日石エネルギー株式会社 Système de génération d'énergie solaire et procédé de détection de défaillance

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JPS58175925A (ja) * 1982-04-08 1983-10-15 三菱電機株式会社 太陽光発電システムの故障検出方式
JP2001174530A (ja) * 1999-12-15 2001-06-29 Maki Mfg Co Ltd 太陽電池の特性測定装置
JP2005253171A (ja) * 2004-03-03 2005-09-15 Yamatake Corp 定電流源回路とその制御方法
JP2013080745A (ja) * 2011-09-30 2013-05-02 Mitsubishi Electric Corp 太陽光発電システム及び太陽光発電管理システム
WO2013115236A1 (fr) * 2012-01-30 2013-08-08 Ｊｘ日鉱日石エネルギー株式会社 Système de génération d'énergie solaire et procédé de détection de défaillance

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JP2017163805A (ja) * 2016-03-11 2017-09-14 オムロン株式会社 太陽電池の故障検出装置および太陽光発電システム

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