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对智能电网中分布式发电的接入问题———孤岛检测进行了分析和总结,对孤岛的形成和危害进行了简述,就逆变器侧孤岛检测的各种方法进行了对比分析,提出采用过频/欠频、过压/欠压与自动相位偏移(APS)相结合的方法进行孤岛检测。并由此设计了软件流程图和相应的硬件电路,研制出孤岛检测控制单元,能够有效地检测出孤岛并防止孤岛的发生。
The problem of access to distributed generation in smart grid --- islanding is analyzed and summarized, and the formation and harm of islanding are briefly described. Various methods of islanding detection on the inverter side are compared and analyzed. Using over / under frequency, overvoltage / undervoltage and automatic phase shift (APS) a combination of methods for islanding detection. And the software flow chart and the corresponding hardware circuit are designed accordingly, and the island detection control unit is developed, which can effectively detect isolated islands and prevent islanding.