摘要
交直流输电线路的电力系统次同步振荡(SSO)可能起因于交流线路中的串联电容补偿或HVDC控制系统,当串补交流线路与HVDC系统并存时,其相互作用使得SSO问题更加复杂。研究对象为呼辽±500kV高压直流输电系统与合串补伊冯500kV交流输电系统并存的复杂交直流系统,通过Prony算法得到可能引发该系统次同步振荡的模态,由轴系振荡模态衰减系数对比分析了不同运行方式下的SSO特性,并结合基于PSCAD/EMT-DC的时域仿真法验证了Prony算法应用于次同步振荡模态分析的有效性。研究表明,交直流系统中采用联网运行带可控串补的方式能同时抑制高压直流输电系统和交流输电线路中固定串补引起的SSO问题。
The AC/DC system with series capacitor being constructed in China is hybrid of the Hulunbeier-Liaoning ±500kV HVDC lines and Yimin-Fengtun 500kV AC transmission system,and its subsynchronous oscillation(SSO)problem becomes complex because of the mutual effect of series capacitor compensation and HVDC.Consequently,a Prony identification method was adopted to identify the attenuation coefficient of each oscillation modes in order to analyze the SSO characteristic of different operation conditions.The results of time-domain simulation method prove the Prony identification connecting operating AC/DC system with TCSC can mitigate SSO caused by HVDC or fixed series capacitor.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第12期3035-3040,共6页
High Voltage Engineering
基金
国家电网网联直流公司科技项目(KH0954)~~
关键词
交直流系统
可控串补
时域仿真法
振荡模态
PRONY辨识
次同步振荡
AC/DC system
thyristor controlled series capacitor(TCSC)
time-domain method
oscillation mode
Prony identification
subsynchronous oscillation(SSO)