多馈入直流交互影响强度的评估指标

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多直流馈入电网已经提出了几种改进的短路比指标,但对其有效性一直缺少全面和定量的评估.文中以含有5回直流的南方交直流并联电网为蓝本构造了多组仿真测试模型,对评估多馈入直流受端电网强度的2种多馈入短路比指标和多馈入影响因子指标的性能进行了系统、全面的定量评估,指出了指标存在的不足和适用范围.提出了一个评估多直流间交互影响强度的新结构性指标--暂态电压支撑强度指标.通过新指标与CIGRE推荐指标的对比以及指标与受端电网暂态电压跌落和直流换相失败持续时间等特征量之间的定量关系分析,验证了新指标的适用性.
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