TCT-CSR功率调节对控制绕组零序过流保护的影响  

Impact of TCT-CSR Power Regulation on Zero-sequence Overcurrent Protection of Control Windings

作　　者：张芬芬[1] 郑涛[1] 刘连光[1] 

机构地区：[1]华北电力大学,新能源电力系统国家重点实验室,北京市102206

出　　处：《电力系统自动化》2016年第15期126-132,共7页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB2015200)~~

摘　　要：晶闸管控制变压器式可控并联电抗器(TCT-CSR)具有功率大范围平滑可调、响应速度快等优势,在超/特高压电网中具有良好的应用前景。以TCT-CSR低压物理模型为研究对象,针对TCT-CSR功率快速大幅度调节对本体保护的影响开展研究。根据TCT-CSR结构及原理建立了其稳态运行及功率调节过程的简化数学模型,研究了TCT-CSR功率调节的暂态特性及其对TCTCSR控制绕组零序过流保护的影响,仿真计算确定了与TCT-CSR功率调节范围对应的控制绕组基波零序电流峰值和暂态持续时间两项指标。在此基础上,提出通过适当增大控制绕组电阻的方法防止本体保护误动,经过大量仿真试验的对比分析,研究确定了电阻阻值的取值范围及其防误动的效果,为TCT-CSR本体参数的设计改进提供了重要参考。Possessing such advantages as continuously adjustable reactive power and high operating speed,the thyristor controlled transformer-type controllable shunt reactor（TCT-CSR）is preferred to reactive power control in extra/ultra-high voltage transmission systems.This paper focuses on the impact of power regulation of TCT-CSR on its protection system.Based on the structure and operating principles of TCT-CSR,a simplified mathematical model for its operation in both the steady state and transient state during power regulation is proposed.The transient characteristics during power regulation and its influence on zero-sequence overcurrent protection of control windings are analyzed.The fundamental zero-sequence current peak value and the transient state duration after power regulation are determined according to simulation results.Based on this,an approach to increasing the resistance of control windings is proposed.The value of the resistor and its influence on the performance of zero-sequence overcurrent protection during power regulation are discussed in detail.Finally,the appropriate value of the resistor of control windings is recommended as a reference for substantial design following a comparison of simulation results in different scenarios.

关 键 词：可控并联电抗器(CSR) 功率调节 暂态特性 零序过流保护 抑制措施 

分 类 号：TM472[电气工程—电器]