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新能源电力系统国家重点实验室(华北电力大学),北京市 102206
郑涛(1975—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力系统保护与控制。E-mail:zhengtao_sf@126.com
马家璇(1998—),女,硕士研究生,主要研究方向:电力系统继电保护。E-mail:1014613714@qq.com
吕文轩(1996—),男,博士研究生,主要研究方向:电力系统继电保护。E-mail:ncepulwx@163.com
收稿:2022-05-17,
修回:2022-12-22,
网络出版:2023-05-17,
纸质出版:2023-06-25
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郑涛,马家璇,吕文轩等.基于暂态负序电流积聚量比值的海上风电交流汇集线路保护[J].电力系统自动化,2023,47(12):137-144.
ZHENG Tao,MA Jiaxuan,LYU Wenxuan,et al.Protection for AC Collection Line of Offshore Wind Power Based on Ratio of Transient Negative-sequence Current Accumulation[J].Automation of Electric Power Systems,2023,47(12):137-144.
郑涛,马家璇,吕文轩等.基于暂态负序电流积聚量比值的海上风电交流汇集线路保护[J].电力系统自动化,2023,47(12):137-144. DOI: 10.7500/AEPS20220517005.
ZHENG Tao,MA Jiaxuan,LYU Wenxuan,et al.Protection for AC Collection Line of Offshore Wind Power Based on Ratio of Transient Negative-sequence Current Accumulation[J].Automation of Electric Power Systems,2023,47(12):137-144. DOI: 10.7500/AEPS20220517005.
海上风电经柔性直流送出系统交流汇集线路发生不对称故障时,线路因两侧换流器采用负序抑制策略而呈现微弱故障特征,导致常规工频量交流保护性能下降。文中首先分析了海上交流汇集线路发生不对称故障时的故障回路及区内、外故障下负序电流的分布情况,发现连接于同一母线的故障线路与非故障线路的负序电流存在明显差异。进而通过构造负序电流积聚量,放大故障线路与非故障线路的负序电流幅值差异特征,提出了一种基于暂态负序电流积聚量比值的交流汇集线路保护方案。所提方案可实现故障线路的快速准确识别,具有一定的耐过渡电阻能力。最后,基于PSCAD/EMTDC平台进行了仿真验证,结果表明新方案具有可行性和有效性。
When an asymmetric fault occurs in the AC collection line of offshore wind power through a flexible DC transmission system
the line has weak fault characteristics due to the negative-sequence suppression strategy adopted by the inverters on both sides
resulting in a decrease in the performance of conventional power frequency AC protection. This paper first analyzes the faulty circuit when an asymmetric fault occurs on the offshore AC collection line
as well as the distribution of negative-sequence current under internal and external faults. It is found that there is a significant difference in the negative-sequence current between the faulty line connected to the same bus and the non-faulty line. Furthermore
by constructing the accumulation of negative-sequence current and amplifying the difference in negative-sequence current amplitude between faulty and non-faulty lines
a protection scheme for AC collection lines based on the ratio of transient negative-sequence current accumulation is proposed. The proposed scheme can achieve rapid and accurate identification of fault lines
and has a certain ability to withstand transition resistance. Finally
simulation verification is conducted on the PSCAD/EMTDC platform
and the results show that the proposed scheme is feasible and effective.
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