多馈入直流功率调制换相失败特性研究  

Research on characteristics of commutation failure in DC power modulation of multi-infeed HVDC system

作　　者：高媛[1] 韩民晓[1] 陈修宇[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《华北电力大学学报（自然科学版）》2014年第2期36-40,46,共6页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51177044);国家电网公司大电网重大专项资助项目(SGCC-MPLG019-2012)

摘　　要：多馈入高压直流输电系统中,直流功率调制可以起到多回输电通道间功率支援和阻尼振荡的作用,但功率调制过程中,幅度与上升时间控制不当会引起逆变站换相失败。给出了引起换相失败的直流功率调制临界指标,理论推导熄弧角、受端交流系统强度、系统的控制方式对该临界指标的影响,并仿真验证上述三个因素对直流功率调制的影响。基于多馈入高压直流输电系统,分析并验证直流功率调制造成的换相失败不会引发多馈入直流间同时换相失败。所作研究及成果为多馈入直流输电系统中直流功率调制和换相失败的研究提供参考。In multi-infeed HVDC system, DC power modulation can play a role in power support between the transmission lines and damping oscillation. And it may cause commutation failure if the amplitude and rising time of modulation are inappropriate. In this paper, the critical index of DC power modulation which can may cause commutation failure is given. Effects of extinction angle, AC system strength of receiving end and control modes of system on this critical index are analyzed. Then, influences of these three factors on the DC power modulation have been verified by simulation. Based on multi-infeed HVDC transmission, the conclusion that commutation failure caused by DC power modulation will not cause simultaneous commutation failures in multi-infeed DC lines is analyzed and verified. This paper provides a reference for the research of DC power modulation and commutation failure in multi-infeed HVDC transmission.

关 键 词：直流功率调制 换相失败 熄弧角 受端交流系统强度 控制方式 多馈入直流输电 

分 类 号：TM721[电气工程—电力系统及自动化]