摘要
文中分析了高压直流输电交流滤波器在投入时可能引起的谐波冲击。阐述了谐波电流引发串并联谐振,导致系统谐波放大的机理。根据换流站电缆普遍采用双端接地的特点,结合等效电路,对此谐波引发的感性耦合干扰进行了分析。结合实际波形对以上分析结果进行了验证。提出了通过改善二次控制电缆屏蔽方式,增加中间继电器动作功率从而增强抗干扰能力,提高保护动作可靠性。通过改进系统设计及优化分相合闸装置,解决滤波器投切时冲击过大的问题。
The harmonic likely to be induced by AC filter switching in high-voltage direct current （HVDC） is analyzed.This paper reveals the mechanism of the harmonic current causing series and parallel resonance that leads to harmonic amplification. According to the grounding features of the cable in the converter station,the inductive coupling interference due to this harmonic is analyzed.A case of real interference wave induced by the AC filter switching is used to validate the correctness of the above analysis.Further,some methods are proposed to solve the problem by improving the shield of secondary cable and increasing the action power of the intermediate relay to improve the reliability of the protection device.The system design and phase selection system are optimized to reduce the excess impact during filter switching.
出处
《电力系统自动化》
EI
CSCD
北大核心
2014年第19期122-125,135,共5页
Automation of Electric Power Systems
关键词
高压直流输电
滤波器投切
换流站
谐波放大
二次回路
电压干扰
high-voltage direct current （HVDC） transmission
filter switching
converter station
harmonic amplification
secondary circuit
voltage disturbance
