Research on Leakage Fault Mechanism of Photovoltaic Power Station Considering Photovoltaic Inverter

Abstract

Taking into account the commissioning and grid connection of a large number of centralized or distributed photovoltaic power stations such as “crop-farming-photovoltaic complementation photovoltaic power station”, “fishery-photovoltaic complementation photovoltaic power station”, and “graziery-photovoltaic complementation photovoltaic power station”, at the same time, the above-mentioned characteristics of photovoltaic power stations have a large flow of personnel and complex personnel composition, It is bound to increase the probability of electric shock accidents caused by the decline of the cable insulation or insulation defects. Aiming at the electric shock accident of the power line and paying attention to electric shock fault current, a method for calculating electric shock fault current based on PLR analysis method is proposed. By establishing a mathematical model for calculating electric shock fault current, the effectiveness of the fault current is derived. value, and verified by MATLAB-SIMULINK, indicating the applicability of the calculation method. Finally, the analysis results show that under the same voltage level, taking into account the surge of electric shock fault current of the power line with photovoltaic inverters, the personal safety level has dropped significantly, and the influencing factors and general rules of the fault current are further summarized, Necessity indicating that photovoltaic power stations should improve the leakage protection technology. And to provide certain theoretical support for the study of leakage faults protection of the power line in photovoltaic power stations.