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电网技术  2014 

基于多回直流功率转移的受端电网节假日期间电压控制

DOI: 10.13335/j.1000-3673.pst.2014.11.016, PP. 3045-3051

Keywords: 节假日,多回直流功率转移,多直流馈入系统,无功交换,电压控制

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Abstract:

节假日期间,电网负荷大幅下降,潮流轻载导致容性无功过剩,电压显著升高。对于多直流馈入受端电网,受直流换流站内绝对最小滤波器投入组数的制约,密集落点的多个直流换流站在直流低功率运行方式下会同时向交流电网注入大量容性无功,导致电网电压大幅升高且难以通过常规电压调整手段控制。提出了考虑多回直流功率转移的电压控制策略,在不改变直流总送电计划的基础上,通过优化分配多回直流的功率来改变直流与交流电网的无功交换数量,进而有效降低电网电压。华东电网实际案例和仿真计算均显示,在多回直流之间进行有功功率转移能有效地改善多直流馈入受端电网的无功潮流分布,合理控制系统电压。

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