Abstract
Due to the deep coupling of the DC faults for the two-stage photovoltaic (PV) inverters, it is very difficult to determine the specific causes of DC faults. In terms of this issue, the fault mechanism of different causes is analysed and the obvious fault features are selected to locate the causes. Furthermore, a complete set of fault diagnosis process is proposed for DC overvoltage and undervoltage faults. An experimental platform for PV power generation system is used to simulate the deterioration of operating conditions and obtains various fault data. The results show that the correctness of fault mechanism analysis and the effectiveness of the proposed diagnosis process.
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