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混合双馈入直流系统中VSC-HVDC对LCC-HVDC受端系统强度的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.16.007, PP. 4052-4061

Keywords: 混合双馈入直流系统,牛顿最优潮流,等效阻抗,电压支撑强度,等值有效短路比

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Abstract:

为了准确评估混合双馈入直流系统中电网换相换流器高压直流输电(linecommutatedconverterbasedhighvoltagedirectcurrent,LCC-HVDC)子系统的受端系统强度,对LCC-HVDC子系统的有效短路比进行研究。第一,基于牛顿最优潮流算法,分析混合双馈入直流系统中电压源换流器高压直流输电(voltagesourceconverterbasedHVDC,VSC-HVDC)子系统采用不同的功率输送方向和控制方式时,对LCC-HVDC子系统的交流系统电压支撑强度的影响关系。第二,计算VSC-HVDC子系统的等效阻抗,提出能够有效评估混合双馈入系统中LCC-HVDC子系统有效短路比的等值有效短路比指标。利用该指标可将混合双馈入直流系统中LCC-HVDC子系统等效为受端交流系统电压支撑强度与之相同的单馈入直流输电系统。最后,基于PSCAD/EMTDC进行仿真分析,仿真结果证明了VSC-HVDC对LCC-HVDC子系统影响关系的正确性以及等值有效短路比指标的有效性。

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