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多端柔性直流输电系统小信号建模

DOI: 10.13334/j.0258-8013.pcsee.2015.16.003, PP. 4015-4024

Keywords: 多端柔性直流输电系统,小信号模型,同步旋转坐标系,交直流耦合

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Abstract:

小信号模型是动态系统稳定性分析及控制器设计的基础。通过理论分析和推导,对现有多端柔性直流输电系统小信号模型存在的不足之处加以修正和完善。首先根据换流站所连交流系统类型,灵活选择同步旋转坐标系,以避免交流系统短路容量引起的误差;然后根据换流器PWM调制原理,分析暂态情况下换流器交直流侧耦合机理并对换流器线性化方程加以完善,分别构建控制器和直流网络的线性化方程;最后形成适用于多种应用场景混合及任意拓扑结构的多端柔性直流输电系统通用小信号模型。通过电磁暂态模型与小信号模型的仿真对比,验证了该小信号模型较现有模型具备更好的准确性,对多端柔性直流输电系统稳定性分析、耦合机理研究及控制器设计具有很好的参考价值。

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