谐波电压引起HVDC系统换相失败的风险评估  

Risk Assessment of HVDC System Commutation Failure Caused by Harmonic Voltage

作　　者：宋世旗 张代润[1] 郭宛鑫 刘科亿 SONG Shiqi;ZHANG Dairun;GUO Wanxin;LIU Keyi(School of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan Province,China;Nanrui Electrical and Automation College,Nanjing Normal University,Nanjing 210023,Jiangsu Province,China)

机构地区：[1]四川大学电气工程学院,四川省成都市610065 [2]南京师范大学南瑞电气与自动化学院,江苏省南京市210023

出　　处：《电网技术》2021年第11期4505-4511,共7页Power System Technology

摘　　要：换相失败是高压直流输电系统(highvoltagedirect current transmission,HVDC)中研究的热点问题之一。目前,国内外研究主要基于基波电压跌落引起的换相失败,对谐波电压引起的换相失败还有待深入。从换相过程的机理出发,基于换相电压—时间面积法,提出谐波影响系数Fn,然后将Fn与换相裕度结合,提出了一种快速评估低次谐波电压引起换相失败风险的计算方法。最后,基于PSCAD/EMTDC电磁暂态仿真平台对文中提出的理论进行了仿真验证。Commutation failure is one of the hot topics in High Voltage Direct Current transmission(HVDC). At present,the research at home and abroad is mainly based on the commutation failure caused by fundamental voltage sag, but the commutation failure caused by harmonic voltage still needs to be further studied. In this paper, based on the mechanism of the commutation process and the commutation voltage-time area method, the harmonic influence coefficient is proposed. Then combined with the commutation margin, a calculation method for rapidly evaluating the commutation failure risk caused by the low harmonic voltage is proposed.Finally, based on the PSCAD/EMTDC electromagnetic transient simulation platform, the theory proposed in this paper is simulated and verified.

关 键 词：高压直流输电 换相失败 谐波电压 谐波影响系数 

分 类 号：TM721[电气工程—电力系统及自动化]