分布式光伏发电系统的孤岛检测方法研究

Research on Islanding Detection Method for Distributed Photovoltaic Power Generation System

分布式光伏发电系统孤岛运行可能会伤害人员并损坏电网负载,因此应对其加以有效检测,并使处于孤岛状态的分布式光伏发电系统与电网隔离。为此提出了一种基于电压指数检测的分布式光伏发电系统的孤岛运行检测方法。所采用的电压指数与系统频率和系统电压的变化值相关,能够显示孤岛运行后的系统频率的变化。仿真结果表明,所提方法在孤岛运行检测中是有效的。

Island operation of distributed photovoltaic systems can harm people and damage grid loads.Therefore,it should be effectively detected and isolated from the grid by distributed photovoltaic power generation systems in an island state.An islanding operation detection method of distributed photovoltaic power generation system based on voltage index detection is proposed.The adopted voltage index is related to the system frequency and the change value of system voltage,which can show the change of system frequency after islanding operation.Simulation results show that the proposed method is effective in islanding operation detection.