摘要
为了研究±1 100 kV直流换流站内典型接地过电压的特点以及检验避雷器配置的合理性,针对准东—皖南±1 100 kV特高压直流输电工程,利用PSCAD程序仿真计算了双极全压运行方式、单极金属回线运行方式、单极大地运行方式下阀顶接地、换流变阀侧接地、直流母线接地和直流极线出口接地等典型接地故障产生的过电压,并分析了其波形特征,给出了避雷器的最大残压和吸收能量。计算结果表明,整流侧接地故障时避雷器吸收的能量约为逆变侧的10倍;在当前避雷器布置下所有关键节点的过电压值均低于该位置的绝缘水平,且避雷器吸收能量均未超过其能量吸收能力,因此目前的避雷器布置是合理的。
In order to investigate the characteristics of overvoltage on typical grounding faults and check the reasonability of current arrester arrangement ±1 100 kV HVDC converter station,the grounding faults occurred in both converter stations were analyzed based on Zhundong-Wannan HVDC transmission project using PSCAD.Overvoltage caused by following situations were taken into calculation under bipolar full voltage,mono-polar metallic return,and mono-polar ground return styles（grounding fault at top of converter,grounding fault transformer winding at valve side,and grounding fault at DC bus and DC line）.Moreover,the characteristics of overvoltage waveform were analyzed and the maximum voltage and absorbed energy of corresponding arresters are provided.The calculation results indicate that the energy caused by faults at rectifier side is 10 times as much as that at inverter side.The key points＇ overvoltage values are all below their insulation withstanding level and the energy absorbed by the arresters is below the energy absorption ability under current arrester arrangement.This arrangement is reasonable.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第10期3238-3247,共10页
High Voltage Engineering
基金
国家重点研发计划(2016YFB0900801)
国家自然科学基金(51577150)~~
关键词
高压直流输电
换流站
运行方式
接地过电压
避雷器布置
PSCAD
能量吸收能力
HVDC transmission
converter station
operation style
grounding overvoltage
arrester arrangement
PSCAD
energy absorption ability
