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一种具备直流清除能力的MMC换流器改进拓扑

DOI: 10.13334/j.0258-8013.pcsee.2014.36.003, PP. 6389-6397

Keywords: 模块化多电平换流器,直流线路故障,瞬时性故障,故障清除,故障恢复

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Abstract:

基于模块化多电平换流器(modularmultilevelconverter,MMC)的柔性直流输电系统(flexiblehighvoltageDCtransmissionbasedonMMC,MMC-HVDC),在可再生能源的远距离电力输送方面富有潜力。直流线路故障是MMC-HVDC必须解决的关键问题。提出一种具有直流故障穿越能力的MMC改进拓扑。该拓扑基于二极管嵌位式双子模块,利用子模块电容电压来抑制直流故障的二极管续流效应,关断故障电流通路,从而迅速地清除故障电流。对于瞬时性直流故障,由于故障清除过程中无需断开交流断路器,MMC还能够快速重启、恢复供电。这种改进拓扑附加功率器件的额定电压仅为常规功率器件的一半,额外成本较低。达到同等电压等级,所需子模块数目仅为常规设计的一半,降低了脉冲控制的设计难度和硬件成本。基于PSCAD仿真平台的结果验证了文中所提拓扑和保护方法的有效性。

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