Study of Centralized Anti-Islanding Method on Large-Scale Photovoltaic Power Plants

摘要

This paper presents a centralized anti-islanding method on large-scale PV power plants. Contrast to traditional perturbation technology based on single photovoltaic inverter, this method employs a centralized protection device to inject current disturbance onto the photovoltaic power plants, and the measurements of the high-frequency reactance is used to identify islanding. Defects of active islanding detection method for multiply parallel photovoltaic inverters are analyzed. Simulation results demonstrate the effectiveness of the technique for islanding identification of large-scale photovoltaic power plants.