网侧电感电压相角差正反馈防孤岛检测

摘要

构建分布式发电系统的逆变器网侧电感相角正反馈孤岛检测模型,并研究模型的正反馈系数对孤岛检测的效果.发现在孤岛出现时,在负载和逆变器容量匹配状态不同的情况下,网侧电感相角正反馈会使逆变器并网公共点(PCC)的电压和频率的变化速度、变化方向和变化幅度呈现不同的变化特性,需要同时结合电压和频率的变化特性,才能更好地实现防孤岛检测.%Positive feedback anti-island detection for voltage phase angle of grid side inductance inverter model is built for distributed generation system.The effect of positive feedback coefficient for the model is studied.When island phenomenon occurs the difference capacity of load and inverter,it shows different characteristic for the rate,direction and amplitude of voltage and frequency for a point of common coupling(PCC).In order to accurately detect anti-island,it is necessary to analysis the change characteristics of voltage and frequency at the same time.