A pid online detection method for crystalline silicon photovoltaic power station
A photovoltaic power station and detection method technology, applied in the field of solar photovoltaic power generation, can solve the problems of dark luminescence and inability to accurately judge whether PID has occurred in the power station, and achieve the effect of saving operating costs and high accuracy
Inactive Publication Date: 2017-12-08
中电华创(苏州)电力技术研究有限公司
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In fact, cells with degraded performance in the module also emit darker light than other cells in the module when a positive voltage is applied. Therefore, the dimming of individual cells is not a sufficient condition for PID to occur, and electroluminescence cannot accurately judge a power station. Whether PID occurred
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[0020] The following will be described through specific embodiments in conjunction with the accompanying drawings.
[0021] An on-line PID detection method for a crystalline silicon photovoltaic power station is as follows: at noon when the weather is fine and the sunlight is relatively stable, use a pyranometer to measure the solar radiation at 600W / m 2 -1000W / m 2 around, with little variation over the measured time period.
[0022] Put the photovoltaic array substring connected in series by crystalline silicon solar cell modules into an open circuit, open the junction box of each component of the photovoltaic array substring, and use a digital multimeter or a pointer multimeter to measure the open circuit voltage of each module and the connected bypass. The open-circuit voltage of the battery string of the diode, and record it, if it exists at the same time: (1) In the photovoltaic array substring, start from a module in the middle (for an odd number of solar cell modules i...
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The present invention provides a crystalline silicon photovoltaic power station PID online detection method. In the irradiation of the sun, the photovoltaic array substring formed by crystalline silicon solar cell assemblies in series is arranged at an open circuit, the conjunction box of each assembly of the photovoltaic array substring is opened to respectively measure the open circuit voltage of each assembly and the open circuit voltage of the cell string connected with a diode, and if the open circuit voltages are existing at the same time: (1) the open circuit voltage of the photovoltaic array substring is gradually decreased from one assembly at the middle part and to the last assembly at the cathode of the photovoltaic array substring; (2) the open circuit voltages of two cell strings close to the frame are smaller than the open circuit voltage of the cell string at the middle part from the middle one assembly of the photovoltaic array substring to the last one assembly of the cathode of the photovoltaic array substring, the PID attenuation of the photovoltaic power station happens; and or else, there is no attenuation. The accuracy is high, and the crystalline silicon photovoltaic power station PID online detection method is employed to perform voltage measurement on site to early discover whether the PID of the photovoltaic power station happens or not.
Description
technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation, and relates to an online PID detection method of a crystalline silicon photovoltaic power station. Background technique [0002] Solar photovoltaic power generation is the pillar energy of the future. At present, crystalline silicon photovoltaic power plants are the main form of solar photovoltaic power generation. The basic unit of power generation in crystalline silicon photovoltaic power plants is crystalline silicon solar cell components, which are composed of single crystal silicon or polycrystalline silicon solar cells connected in series and packaged. Power generation components. [0003] Since the operating voltage of a single crystalline silicon solar cell module is less than 50 volts, in order to improve the power generation efficiency of a photovoltaic power station, usually when building a power station, the positive and negative electrodes of multiple cry...
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IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 王鹤杨宏常纪鹏
Owner 中电华创(苏州)电力技术研究有限公司