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电网技术  2015 

MMC-MTDC系统协调启动控制策略

DOI: 10.13335/j.1000-3673.pst.2015.07.006, PP. 1800-1807

Keywords: MMC-MTDC,协调启动策略,预充电方式,闭环均压充电方法

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Abstract:

为快速平稳的启动基于模块化多电平换流器的多端柔性直流输电系统(modularmultilevelconverter-multi-terminaldirectcurrent,MMC-MTDC),避免各站启动时序配合不当引起大的电气冲击甚至启动失败,提出了MMC-MTDC系统协调启动控制策略。首先,指出MMC存在交流侧、直流侧和交直流侧混合3种预充电方式,基于其充电机理,设计了预充电方式识别方法,提出了可将子模块充电至额定电压的闭环均压充电策略;其次,研究了多端系统启动时序的有效配合方案,提出了基于直流电压斜坡控制方式的并联式MMC-MTDC系统协调启动控制策略;最后,通过Matlab/Simulink构建三端系统进行仿真。结果表明闭环均压充电方法能自动适应MMC3种预充电方式,使子模块平稳充电至额定值;协调启动策略则能很好的实现多端系统平稳解锁。

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