下垂控制下考虑负荷电压与频率特性时过欠电压与过欠频率检测盲区分析

Non-detection zone analysis of OUV and OUF considering load voltage and frequency characteristics under droop control

针对目前孤岛检测研究中下垂控制策略下被动法的检测性能分析暂未完备,以及并联RLC负荷无法准确贴合实际负荷工况的问题,选取过欠电压检测法与过欠频率检测法,基于下垂控制策略分析其在考虑负荷电压与频率特性的综合负荷模型下的检测盲区。通过求取并分析检测盲区的数值解可得负荷特性参数、下垂系数标幺值以及负荷消耗功率的变化均会影响检测盲区的分布,同时其与RLC负荷模型下的检测盲区存在差别。仿真实验结果证明了理论分析的正确性。

Aiming at the problems in islanding detection research at present that,the detection performance analysis of passive method under droop control strategy is not complete and the parallel RLC load cannot fit the actual load condition accurately,the OUV(Over/Under Voltage)detection method and the OUF(Over/Under Frequency)detection method are selected,and their none-detection zones under the integrated load model considering voltage and frequency characteristics are analyzed based on droop control strategy.The numerical solution of none-detection zone is calculated and analyzed,which shows that the variations of load characteristic parameters,per-unit droop coefficients and load consumption power have effect on the distribution of none-detection zone,and it is different from the none-detection zone under the RLC load model.Simulative results verify the correctness of theoretical analysis.