Fault diagnosis method and simulation analysis for photovoltaic array

Based on the distinguishing characteristics of the output current and voltage for photovoltaic array working in different states, a novel voltage and current detection method was proposed in this paper compared to the original current and voltage method. Of this method, the fault position can be located precisely and quickly by analyzing the current and voltage variation of each branch, according to the characteristic that the output current as well as voltage of the fault branch is less than the normal one's of the same number modules. The feasibility of this novel method is proved by the simulation results given under the Matlab/Simulink environment.