UHVDC系统换相失败故障过程分析及运行参数影响研究  

Analysis of the commutation failure process and a study on the influence of operation parameters on a UHVDC system

作　　者：韩平平 童青洋 杨为 陈忠 孙浩然 张炎 HAN Pingping;TONG Qingyang;YANG Wei;CHEN Zhong;SUN Haoran;ZHANG Yan(Anhui Provincial Key Laboratory of Renewable Energy Utilization and Energy Saving(Hefei University of Technology),Hefei 230009,China;State Grid Anhui Electric Power Company Limited Research Institute,Hefei 230601,China;No.38 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]新能源利用与节能安徽省重点实验室(合肥工业大学),安徽合肥230009 [2]国网安徽省电力有限公司电力科学研究院,安徽合肥230601 [3]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《电力系统保护与控制》2021年第18期25-34,共10页Power System Protection and Control

基　　金：国家重点研发计划专项资助(2016YFB0900600)。

摘　　要：受端交流系统故障是诱发特高压直流系统换相失败的主要原因,严重影响电网安全。为充分明晰交流系统故障下特高压直流系统换相失败期间阀组换相过程和控制响应,通过故障过程的电磁暂态仿真,基于换相面积理论对比阀组实际关断面积和最小关断面积,分析换相失败的主要原因。对运行参数与换相失败和故障恢复的灵敏度展开研究,发现低压限流环节参数和逆变侧控制的比例系数、积分系数对换相失败和故障恢复过程有明显影响,可以在控制系统优化时重点考虑。该研究可为特高压直流换流站换相失败故障分析及稳定运行提供参考。An AC system fault at the receiving end is the main cause of commutation failure in an Ultra High Voltage Direct Current(UHVDC)system.This can seriously affect the security of the power grid.To fully clarify the commutation process and control response of a valve group during commutation failure of a UHVDC system under an AC system fault,the actual extinction area and the minimum extinction area of the valve group are compared,and the main reason for commutation failure is analyzed through the electromagnetic transient simulation of the fault process.Sensitivity of operational parameters and commutation failure and the fault recovery process is studied.It is found that the parameters of a Voltage Dependent Current Order Limiter(VDCOL),proportional coefficient and integral coefficient of inverter control have obvious effects on commutation failure and the fault recovery process.These aspects can be the first choice for optimizing of the control system.This paper can provide a reference for commutation failure analysis and stable operation of a UHVDC converter station.

关 键 词：特高压直流输电 换相失败 过程分析 运行参数 灵敏度 

分 类 号：TM721.1[电气工程—电力系统及自动化]