摘要
利用小信号分析法,在可控串补(thyristor controlled series compensation,TCSC)的工频电流源上叠加一个微小次同步频率分量的电流源,采用数值分析方法获得次同步频率电容电压的时域仿真曲线;在此基础上分析次同步频率电容电压在晶闸管导通前后的变化规律,推导TCSC次同步频率等效阻抗的解析表达式。结果表明通过解析法求得的次同步频率等效电抗与数值方法获得的特性曲线变化趋势基本吻合;根据对解析表达式的分析,研究晶闸管导通对次同步频率电压的调制作用随导通角增大的变化过程,从周期调制作用角度解释TCSC次同步频率等效阻抗特性形成的机理。
A theory and numeric approach is adopted to directly calculate time domain curves of sub-synchronous frequency voltage, by using small signal method, adding a tiny sub-synchronous frequency component to the fundamental current source. The variety rule of sub-synchronous frequency voltage at beginning and end of thyristor＇s switching-on is analyzed, and the sub-synchronous frequency equivalent impedance of thyristor controlled series compensation （TCSC） is formulated. The result shows sub-synchronous frequency impedance characteristic curves by formulation is closed to numeric approach. Furthermore, by researching the change process of modulation effect along an increase in conduction angle, the mechanism explanation of sub-synchronous frequency impedance characteristic form is given from angle of period modulation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第12期1-6,共6页
Proceedings of the CSEE
基金
国家重点基础研究发展计划项目(973项目)(2004CB-217904)~~
关键词
可控串补
次同步谐振
次同步频率等效阻抗
机理解释
thyristor controlled series compensation
subsynchronous resonance
sub-synchronous frequency equivalent impedance
mechanism explanation
