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电网技术  2006 

基于普罗尼辨识的VSC-HVDC附加阻尼控制器设计

, PP. 25-30

Keywords: 电压源换流器,新型高压直流输电,附加阻尼控制器,普罗尼辨识,低频振荡,多机电力系统

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Abstract:

基于电压源换流器(voltagesourceconverter,VSC)和脉宽调制(pulsewidthmodulation,PWM)技术的新型高压直流输电(VSC-HVDC)系统,具有与传统高压直流输电(HVDC)相似的有功功率控制能力,同时还具有与静止无功发生器(staticsynchronouscompensator,STATCOM)相似的无功功率控制能力。在VSC-HVDC动态模型的基础上,利用电力系统分析综合程序提供的用户自定义功能(PSASP/UD),实现了含有VSC-HVDC的多机系统动态仿真。以定有功功率控制VSC的有功设定值信号为输入端,VSC-HVDC并列交流输电线路的有功功率为输出端,通过对指定输入下输出端时域响应数据的普罗尼(Prony)辨识,获取了两端口间的等值降阶线性开环模型。并利用该降阶开环模型以及极点配置技术,设计了VSC-HVDC单输入单输出结构的附加阻尼控制器。以修改后的CEPRI-36交直流并列输电系统为例进行了仿真分析,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,快速恢复系统稳定。

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