电力系统自动化2024，Vol.48Issue(1)：140-149,10.DOI:10.7500/AEPS20220722004
基于波形距离系数的逆变站近区交流线路保护方向元件
Waveform Distance Coefficient Based Directional Element for AC Transmission Line Protection Near Inverter Station
摘要
Abstract
When the inverter station has only one outgoing line,if the fault of the AC line near the inverter station occurs,the complex characteristics of the inverter station make it difficult for the traditional directional element to identify the fault direction.In this paper,the fault characteristics of AC transmission lines near inverter stations are analyzed.Then,the similarity between AC line current and current variation of the AC boundary element in time domain is proposed.And an electromagnetic transient calculation method is also proposed to calculate current of AC boundary elements by measuring voltage and current.Finally,based on the difference of the waveform distance coefficients between AC line current and AC boundary element current in time domain under forward fault and reverse fault conditions,a new fault direction discrimination principle is proposed.And its performance is verified by extensive simulations.The simulation results show that the proposed directional element can accurately identify the fault direction and has high reliability and sensitivity.关键词
交直流混联系统/逆变站/方向元件/电磁暂态计算/波形距离系数Key words
AC/DC hybrid power system/inverter station/directional element/electromagnetic transient calculation/waveform distance coefficient引用本文复制引用
冀肖彤,柳丹,熊平,陈玉,杨霖,文明浩..基于波形距离系数的逆变站近区交流线路保护方向元件[J].电力系统自动化,2024,48(1):140-149,10.基金项目
国家电网有限公司科技项目(4000-202222070A-1-1-ZN). This work is supported by State Grid Corporation of China(No.4000-202222070A-1-1-ZN). （4000-202222070A-1-1-ZN）
