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电网技术  2009 

轻型直流输电系统的不对称故障控制策略

, PP. 49-56

Keywords: 电压源变流器(VSC),轻型直流输电,不对称故障,精确反馈线性化,负序电流控制

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Abstract:

基于电压源变流器(voltagesourceconverter,VSC)的轻型直流输电(VSC-HVDC)正成为一种经济灵活的新型输电方式。但是当交流系统发生不对称故障时,系统中存在的负序分量在脉宽调制(pulsewidthmodulation,PWM)的作用下会产生大量的非特征谐波,并严重恶化VSC-HVDC系统的控制性能。文章在换流站正序模型的基础上建立了系统的负序模型,提出一种基于精确反馈线性化理论的正负序电流非线性控制器,并针对系统故障时出现的直流过电压问题设计了2种应对策略。在电磁暂态仿真软件PSCAD/EMTDC下对上述控制策略进行了仿真验证,达到了预期的控制效果。

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