A Fault Dictionary Diagnosis Method for Photovoltaic Array Based on Maximum Fuzzy Fault Number

Aiming at the problem that the fault type of PV array is difficult to detect, a fault diagnosis method of PV array fault dictionary based on the maximum number of fuzzy faults is proposed. Firstly, the test point with the most fault information is obtained according to the “maximum number of fuzzy faults”, the node voltage is collected as a new fault characteristic before measurement, and then the node voltage value is divided into a fuzzy domain, the center value of the fuzzy domain is calculated, the fault phenomenon set is established, the working code corresponding to each node is obtained, and the fault dictionary is constructed. In the process of fault diagnosis after testing, it is only necessary to measure the new node voltage value and determine the range of its central value to realize the fault diagnosis of the photovoltaic array. The simulation results show that the proposed method has high accuracy, which proves the feasibility and effectiveness of the method.