摘要
针对分布式光伏系统的孤岛效应问题,本文在分析光伏发电系统防孤岛保护原理的基础上,介绍了被动式孤岛检测与主动式孤岛检测方式,并提出了持续性无功扰动方法。该方法通过注入干扰无功功率引起电压或频率变化,从而根据变化的大小来判断是非处于孤岛运行状态。仿真结果表明,采用该方法可以很好地检测光伏发电系统的孤岛发生情况。
Aiming at the problem of isolated island effect in distributed photovoltaic system,based on the analysis of the principle of anti-island protection in photovoltaic power generation system,this paper introduced the methods of passive island detection and active island detection,and put forward a continuous reactive power disturbance method.The method caused voltage or frequency change by injecting interference reactive power,so that the non-island running state was judged according to the change size.The simulation results showed that this method could detect the island occurrence of photovoltaic power generation system well.
引文
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