张振华,牛志雷,陈干杰,张红跃,古领先.引入IIR滤波器对换流变增量差动暂态性能的影响分析[J].电测与仪表,2018,55(2):129-136. ZHANG Zhenhua,NIU Zhilei,CHEN Ganjie,ZHANG Hongyue,GU Lingxian.Analysis of the impact of Using IIR filter in Incremental differential protection of converter transformer[J].Electrical Measurement & Instrumentation,2018,55(2):129-136.
引入IIR滤波器对换流变增量差动暂态性能的影响分析
Analysis of the impact of Using IIR filter in Incremental differential protection of converter transformer
Based on the analysis and comparison of protection configuration difference between UHVDC and the HVDC engineering, it is pointed out that the IIR digital filter is used for data preprocessing in converter transformer protection for UHVDC engineering. In this paper, from two perspectives of filter type and filter order, the filter parameter is designed by means of filter aided design tool. The effect on transient performance of converter transformer and connecting line incremental differential protection is analyzed, which is caused by using IIR digital filter for data preprocessing. On the premise of satisfying the low frequency characteristic of relay protection system, simulation results show that the 4 order Butterworth low-pass IIR filter is used as the optimum, which can meet the transient performance requirements of relevant specifications.
