摘要
一种新型高压直流输电(HVDC)系统是以电压源换流器(VSC)和脉宽调制(PWM)技术为基础的,具有快速、灵活的有功功率和无功功率控制能力,能改善系统的稳定性。对VSC-HVDC系统的附加控制器进行了研究,使其达到抑制系统中区域间的低频振荡的目的。将并联的多机系统等值为两机两区域系统,直流线路功率调节用一阶惯性环节等效,建立了考虑机电振荡的三阶模型;用非线性控制理论设计了基于变结构控制的VSC-HVDC附加阻尼控制器。仿真结果表明VSC-HVDC配备该阻尼控制器后,可显著增加系统振荡阻尼,迅速恢复系统稳定。
The HVDC based on voltage source converter (VSC) and pulse width modulation (PWM) is a new transmission technology which can improve power system stability due to its fast and flexibly capability to control the active and reactive power.A nonlinear auxiliary controller for VSC-HVDC in AC/DC power system is developed to damp inter-area oscillation.The method treats the dynamics of DC power regulation as a first-order inertia-block and simplifies the AC/DC multi-machine system into a two-machine power system....
出处
《浙江电力》
2008年第5期5-9,共5页
Zhejiang Electric Power
关键词
电压源
换流器
低频振荡
状态反馈
变结构
控制
voltage source
converter
low frequency oscillation
state-feedback
variable structure
control
