UHVDC分层接入系统的线路后备保护优化Transmission Line Backup Protection Optimization in UHVDC Hierarchical Access System
薛志英;李仲青;王兴国;曹虹;谢民;王海港;俞斌;
摘要(Abstract):
UHVDC分层接入交流电网的形式在我国已经屡见不鲜。由于分层以及交直流之间的耦合关系,混联系统的故障暂态过程与纯交流系统有所不同。其中,交流故障引发直流换相失败会给交流系统继电保护带来一定影响。关注距离保护在经过渡电阻接地故障时的动作性能,基于电压相量平面,分析了距离保护测量阻抗不准确的原因和相关因素。然后,结合换流变压器绕组的接线形式,利用对称分量法的序网图进行分析,给出了线路两端零序电流相位的解析表达式;提出了基于零序电流相位的故障判据,并分析了该判据与过渡电阻、负荷电流以及分布电容的关系。最后,仿真验证了所提判据的正确性和有效性。
关键词(KeyWords): 特高压直流输电;分层接入;后备保护;过渡电阻;零序电流
基金项目(Foundation): 国家电网公司总部科技项目:±1100 kV直流/1000 kV交流混联电网继电保护优化策略研究(SGAH0000TKJS 1800050)~~
作者(Author): 薛志英;李仲青;王兴国;曹虹;谢民;王海港;俞斌;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.1452
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