电流控制型与功率控制型分布式电源并存场景下过欠电压与过欠频率的检测盲区分析

Non-detection zone analysis on OUV and OUF under co-existence scenario of current control and power control DG

目前孤岛检测研究中鲜有针对不同控制策略并存时被动法检测性能的研究分析,选取过欠电压检测法与过欠频率检测法,面向电流控制策略与功率控制策略并存场景,通过求取其检测盲区解析解并分析可得,负荷品质因数和负荷消耗无功与有功的比值只影响过欠频率检测法检测盲区,不同控制型逆变器输出有功与负荷消耗有功的比值主要影响过欠电压检测法检测盲区,同时并存场景下与单一控制策略下的检测盲区存在显著差别。

In view of the problems that the detection performance analysis of passive methods are rarely studied in islanding detection research when different control strategies coexist,facing the co-existence of current control strategy and power control strategy,the non-detection zone of the over/under voltage detection method and the over/under frequency detection method are analyzed.The non-detection zone expression is obtained by solving analytical solution and the conclusions are depicted as follows:the load quality factor and the ratio of reactive power to active power consumed by load only affect the non-detection zone of over/under frequency detection method,and the ratio of active power generated by inverters to active power consumed by load under different control strategies mainly affect the non-detection zone of over/under voltage detection method.Simultaneously,there are significant differences between the non-detection zone in the different control strategies coexisting scenario and the single control strategy scenario.