摘要
移相变压器作为潮流控制的有效手段,能够有力地改善电力系统的动态性能。为保障电力系统安全可靠运行,亟须研究移相变压器接入线路后对传统距离保护的影响。鉴于电力系统发生的故障多为不对称故障,故对单芯移相变压器的正负零序等值阻抗建模分析尤为重要。以110 kV单芯对称型移相变压器为研究对象,深入剖析其基本原理,建立单芯移相变压器相序阻抗模型,并探讨经补偿的距离保护方案的适用性。在Matlab/Simulink平台上搭建单芯移相变压器模型,通过在线路上设置不对称短路故障,验证在正负零序等值阻抗建模下经补偿的距离保护方案的有效性。
Phase-shifting transformers are an effective method for controlling power flow,which can significantly improve the dynamic performance of power systems.To ensure the safe and reliable operation of the power system,it is urgent to investigate the impact of phase-shifting transformers on traditional distance protection after their connection to the transmission lines.Given that most power system failures are asymmetrical,modeling and analyzing the positive,negative,and zero-sequence equivalent impedances of single-core phase-shifting transformers becomes crucial.This paper takes the 110kV single-core symmetrical phase-shifting transformer as the research object,delving into its fundamental principles.A phase-sequence impedance model of the single-core phase-shifting transformer is established,and the feasibility of the compensated distance protection scheme is evaluated.The single-core phase-shifting transformer model is built on the Matlab/Simulink platform,simulating asymmetrical short-circuit faults on the line,and the effectiveness of the compensated distance protection scheme under the positive,negative,and zero-sequence equivalent impedance model is verified.
作者
薛玉石
武剑
申由
陈磊
郑涛
XUE Yushi;WU Jian;SHEN You;CHEN Lei;ZHENG Tao(State Grid Shijiazhuang Electric Power Supply Company,Shijiazhuang,Hebei 050031,China;State Key Laboratory of New Energy Power System(North China Electric Power University),Beijing 102206,China)
出处
《河北电力技术》
2024年第6期81-88,共8页
Hebei Electric Power
基金
国网河北省电力有限公司科技项目(kj2022-074)。
关键词
单芯移相变压器
序等值阻抗
适应性分析
经补偿的距离保护
single-core phase-shifting transformer
sequence equivalent impedance
adaptive analysis
distance protection with compensation
