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多馈入直流系统换相失败免疫水平快速确定方法研究

DOI: 10.13334/j.0258-8013.pcsee.2015.11.009, PP. 2711-2717

Keywords: 多馈入直流输电系统,换相失败,换相失败免疫因子,有效短路比,多馈入交互作用因子

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Abstract:

针对目前多馈入直流输电系统中换相失败研究主要采用仿真手段的情况,基于最小熄弧角判断标准,推导多馈入直流系统中当地换相失败免疫因子和同时换相失败免疫因子的解析表达式。通过表达式可快速而有效地确定系统参数对多馈入直流系统中逆变站换相失败免疫水平的影响:当地换相失败免疫因子与故障交流系统有效短路比具有近似的线性关系;在临界多馈入交互作用因子不变时,同时换相失败免疫因子与故障交流系统有效短路比成正比关系,与多馈入交互作用因子成反相关。基于CIGRE直流输电标准模型搭建了双馈入直流输电系统,仿真结果验证了表达式的有效性和准确性。

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