特高压混合无功补偿线路接地故障开断特性  

Interrupting Characteristics of Ground Fault on UHV Transmission Line with Hybrid Reactive Compensation

作　　者：韩明明[1,2] 李清泉[1,2] 刘洪顺[1,2] 李斌[1,2] 吕婷婷 王者 

机构地区：[1]山东大学电气工程学院,山东省济南市250061 [2]山东省特高压输变电技术与装备重点实验室(山东大学),山东省济南市250061 [3]国网山东省电力公司检修公司,山东省济南市250022

出　　处：《电力系统自动化》2016年第12期158-164,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51507095)~~

摘　　要：由分级可控高抗与串补装置组成的混合无功补偿应用于特高压电网时,输电线路发生接地故障,断路器两端的暂态恢复电压(TRV)会受混合无功补偿相关因素的影响而表现出不同的特征。在建立特高压接地故障电网简化模型的基础上,应用理论分析的方法推导在串补电容器组未被短接工况下,断路器开断时其两端瞬态恢复电压上升率(RRRV)及TRV峰值的计算表达式。针对不同时间短接串补电容器组,仿真分析了TRV的波形特征和混合无功补偿度对断路器开断特性的影响。结果表明,串补电容器组未被短接时,架空线路长度固定,RRRV和TRV峰值随着故障距离增加而降低,架空线路长度超过1 100km时,发生接地故障时系统会发生谐振,未达到谐振长度时RRRV和TRV峰值随架空线路长度增加而升高。串补电容器组被短接时的电源工频电压幅值越大,断路器越难以开断,串补和分级可控高抗的补偿度增大利于断路器开断。When ground fault occurs on ultra-high voltage（UHV）transmission line with hybrid reactive power compensation using stepped controlled reactor and series compensation equipment,the transient recovery voltage（TRV）at both ends of the circuit breaker will show different characteristics by the related factors of hybrid reactive power compensation.Based on a simplified model of the UHV grounding fault network,the calculation expressions of the rate of rise of recovery voltage（RRRV）and the peak value of TRV are derived by theoretical analysis in the case of not shortened capacitor banks of series compensation when the circuit breaker opens.The waveform characteristics of TRV and the effect of hybrid reactive power compensation degree on breaking characteristics of the circuit breaker is analyzed by simulation in the case of shortening of series compensation at different times when the circuit breaker opens.The results show that RRRV and TRV peak decrease with an increase in the fault distance when the capacitor group of series compensation is not shortened and the length of the overhead line is fixed.When the length of overhead line is increased over 1 100 km,resonance will occur in UHV power grid when ground fault occurs.If the overhead line is shorter than 1 100 km,RRRV and TRV peak will increase with the length of the overhead lines getting longer.The more difficult it is to break the circuit breaker,the bigger the voltage value of power will be when the series capacitor group is shortened,while the increase in the compensation degree of series compensation and stepped controlled reactor is more conducive to the circuit breaker opening.

关 键 词：混合无功补偿 串补装置 暂态恢复电压 瞬态恢复电压上升率 补偿度 

分 类 号：TM75[电气工程—电力系统及自动化]