HVDC输电系统临界换相电压及影响因素  

Research on Critical Commutating Voltage and Its Influencing Factors in HVDC Transmission System

作　　者：王云昊[1] 何梦琪 黄超群 

机构地区：[1]国网天津市电力公司城西供电分公司,天津300113 [2]天津市金鼎线材制品科技开发有限公司,天津300222 [3]天津经纬电材股份有限公司,天津300353

出　　处：《云南电力技术》2014年第3期77-80,共4页Yunnan Electric Power

摘　　要：分析了换相失败期间阀电流特性然后从阀电流的角度给出了临界换相电压的定义及表达式,进而详细分析了影响临界换相电压的各种因素。分析发现基于临界换相电压的角度能更全面的分析换相失败的机理。根据影响因素的分析结果提出了减少换相失败发生的措施。最后通过国际大电网会议(CIGRE)标准高压直流输电测试系统验证了结论的正确性。Commutation failure is one of the most common faults in HVDC transmission system, which has a strong link with the commutating voltage. In this paper, the characteristic of valve current is analyzed at first and the definition of critical commutating voltage is put forward. Then, the influencing factors of critical commutating voltage are all analyzed in detail. It is found that it can analyze the principle of commutation failure better from the perspective of critical commutating voltage. According to the analysis result, some countermeasures are proposed to prevent the commutation failure. At last, the standard test model based on CIGRE proves the conclusions to be true.

关 键 词：换相失败 临界换相电压 平波电抗器 

分 类 号：TM721.1[电气工程—电力系统及自动化]