Parameter identification based photovoltaic array fault diagnosis method
A photovoltaic array and parameter identification technology, which is applied in photovoltaic power generation, photovoltaic modules, photovoltaic system monitoring, etc., can solve the problems of complex and cumbersome diagnosis process, poor practicability, and low reliability of diagnosis results, so as to reduce the number of sensors and shorten the The effect of cycle time, high confidence and precision
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[0041] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0042] This fault diagnosis system is suitable for such as figure 1 In the photovoltaic array shown, the photovoltaic modules 1 are connected in series to form a string branch, and each string branch is connected in parallel to form a photovoltaic array 6, the array is connected to the combiner box 2, and many combiner boxes 2 are connected to the DC side of the grid-connected inverter 3 The direct current is converted into alternating current by the inverter 3 and input to the grid; each photovoltaic module is connected in parallel with a bypass diode 4 , and each string branch is connected in series with a blocking diode 5 .
[0043] Such as figure 2 As shown, M adjacent photovoltaic modules 1 form a photovoltaic group 7, and the remaining photovoltaic modules 1 that are less than M also form a photovoltaic group 7, and each string branch is divided into several ...
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