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电网技术  2015 

基于大规模子模块群的MMC建模与快速仿真算法

DOI: 10.13335/j.1000-3673.pst.2015.05.009, PP. 1226-1232

Keywords: 模块化多电平变流器,高压直流输电,简化模型,变流器桥臂,仿真

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Abstract:

对高压大容量模块化多电平变流器(modularmultilevelconverter,MMC)和基于MMC的直流输电系统进行仿真时,子模块数目众多,导致了仿真速度缓慢。针对该问题,分析了MMC桥臂的电气行为,建立了在闭锁状态和解闭锁状态时桥臂的数学模型。对该数学模型进行简化后,建立了桥臂的等效电路和等效电气关系,使之能够模拟桥臂的闭锁状态和解闭锁状态。为验证桥臂的等效电路和等效电气关系的准确性,设计了一个柔性直流输电系统,并在仿真软件中搭建了基于详细MMC模型和简化MMC模型的直流输电系统,对MMC的启动、解闭锁、稳态过程和直流故障过程进行了仿真。仿真结果表明,2种仿真模型的电气行为基本保持一致,验证了简化MMC模型的准确性。

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