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向无源网络供电的MMC-HVDC系统控制与保护策略

DOI: 10.13334/j.0258-8013.pcsee.2014.03.011, PP. 405-414

Keywords: 模块化多电平换流器,高压直流输电,无源网络,欧拉-拉格朗日数学模型,无源控制,控制保护策略

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Abstract:

向无源网络供电的模块化多电平换流器型高压直流输电(modularmultilevelconverterbasedHVDC,MMC-HVDC)系统是柔性直流输电技术的一个重要应用领域,因此有必要对其控制与保护策略进行研究。基于MMC电磁暂态数学模型,建立了d-q同步旋转坐标系下MMC欧拉?拉格朗日(Euler-Lagrange,EL)数学模型,推导了适于MMC控制的无源控制规律,设计了内环电流无源控制器及向无源网络供电的MMC-HVDC系统定交流电压控制器。针对电网电压不平衡或交流系统不对称故障引起的负序电流,提出了基于EL模型的正负序电流无源控制器。为保证故障时系统能满足安全运行的条件,提出了故障时的控制保护策略。最后在PSCAD/EMTDC中对MMC-HVDC系统各种运行工况进行了仿真验证,并对正负序无源控制器和矢量控制器的控制性能做了仿真对比,仿真结果表明,所提出的控制器和控制保护策略具有良好的动稳态控制性能,便于工程实际应用。

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