Overcurrent protection scheme for collector lines in wind farm based on fault component current correlation analysis and multi‐agent system
Overcurrent protection scheme for collector lines in wind farm based on fault component current correlation analysis and multi‐agent system
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DOI：
10.1049/iet-rpg.2019.0315
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发表时间：
2019-12
影响因子：
2.6
通讯作者：
T. Zheng;Yutong Zhao;Yifan Zhu
中科院分区：
文献类型：
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作者：
T. Zheng;Yutong Zhao;Yifan Zhu
大型并网风电场的集电线路继电保护故障至今尚未引起足够的重视。分析了传统过电流整定方法在双馈风力发电机组中的适用性，揭示了风电涡轮机（WT）分支集电线路继电器与熔断器保护配合的困难以及后备过电流继电器（BOCR）误动的潜在原因。提出了一种新的过流继电器三级整定方法。针对时限型瞬时过流继电器，提出了一种考虑熔断器时间-电流特性的延时整定方法。基于灵活有效的多智能体系统，将故障分量电流相关性分析和差动电流判据相结合的综合判据应用于BOCR。在DIgSILENT/Powerfactory平台上对46-WT风电场进行了仿真验证。仿真结果表明，该保护能够在0.32 s内跳闸，BOCR在单故障甚至多故障情况下均能正常工作。
Collector line relay failures of large-scale grid-connected wind farms have not received much attention so far. In this study, the adaptability of conventional overcurrent setting method is analysed when used in doubly fed induction generator-based wind farms, revealing the coordination difficulties between collector line relay and fuse protection of wind turbine (WT) branch as well as the potential maloperation causes of backup overcurrent relays (BOCRs). Then, a novel three-stage setting method of overcurrent relays is proposed. In view of time-bound instantaneous overcurrent relays, a time delay setting approach is put forward considering the time–current characteristic of fuses. Based on the multi-agent system, which is both flexible and effective, comprehensive criteria containing fault component current correlation analysis and differential current criterion are applied to BOCRs. The proposed scheme is validated by the simulation of 46-WT wind farm on DIgSILENT/Powerfactory platform. Simulation results show that the relay is able to trip within 0.32 s and the BOCRs perform well when confronting single fault or even multiple faults.