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电网技术  2006 

基于电压源换流器的高压直流输电系统离散化建模与仿真研究

, PP. 34-39

Keywords: 高压直流输电,电压源换流器,离散化模型,控制

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Abstract:

基于电压源换流器的高压直流输电(voltagesourceconverterbasedhighvoltagedirectcurrenttransmission,VSC-HVDC)的工业控制系统通常为微机控制器,该控制器的控制对象是系统的离散化模型。为此提出了一种在dq0同步旋转坐标系下的VSC-HVDC离散化状态空间模型。在此基础上建立了VSC电流内环离散化控制器和外环控制器,并实现了有功电流和无功电流的解耦控制;为提高VSC-HVDC的外环控制器响应速度,在外环控制器中引入了前馈控制。基于电磁暂态仿真软件PSCAD/EMTDC建立了VSC-HVDC模型及其离散化控制器模型。仿真结果验证了离散模型的正确性以及控制策略的有效性。

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