负序方向元件适应性分析及与MMC-HVDC控制策略协同配合方法Adaptability Analysis of Negative Sequence Directional Element and Cooperative Method With Control Strategy of MMC-HVDC
梁营玉;卢正杰;李武林;霍姚彤;许冠军;王聪;
摘要(Abstract):
由于MMC-HVDC较强的可控性和过流能力的限制,MMC-HVDC的接入改变了交流线路的故障特征,导致基于传统同步电源故障特征设计的负序方向元件存在适应性问题。推导了接入MMC-HVDC换流站的交流线路故障电流和负序阻抗角解析表达式,据此深入分析了不同控制目标、功率参考值、电网电压不平衡度等因素对负序方向元件动作性能的影响。为了保证负序方向元件在各种工况下均能正确判别故障方向并具有较高的灵敏度,提出一种与负序方向元件协同配合的MMC-HVDC控制策略。仿真结果验证了文中理论分析的正确性和所提控制策略的有效性。
关键词(KeyWords): 负序方向元件;协同配合方法;模块化多电平换流器;高压直流输电;适应性分析
基金项目(Foundation): 国家自然科学基金资助项目(51707193);; 中央高校基本科研业务费资助项目(2017QJ05)~~
作者(Author): 梁营玉;卢正杰;李武林;霍姚彤;许冠军;王聪;
Email:
DOI: 10.13335/j.1000-3673.pst.2018.2522
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