基于卸荷电阻的多类型直流断路器自适应重合闸策略  

Adaptive Reclosing Strategy Based on Unloading Resistance for Multi-type DC Circuit Breaker

作　　者：于清源 温伟杰[1] 李斌[1] 张长虹[2] 李博通[1] 李鹏宇 黄瑜珑[3] YU Qingyuan;WEN Weijie;LI Bin;ZHANG Changhong;LI Botong;LI Pengyu;HUANG Yulong(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Nankai District,Tianjin 300072,China;Maintenance&Test Center of EHV Power Transmission Company China Southern Power Grid,Guangzhou 510663,Guangdong Province,China;Department of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072 [2]中国南方电网超高压输电公司检修试验中心,广东省广州市510663 [3]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《中国电机工程学报》2022年第8期3065-3076,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51907141);天津市自然基金资助项目(20JCQNJC01300)。

摘　　要：直流断路器(DC circuit breaker,DCCB)是直流组网的关键设备。由于DCCB拓扑多样、操作特性各异且实际工程中存在一条线路两端配置不同类型DCCB的情况,在研究系统层面的故障处理时,涉及不同类型DCCB的详细建模和重合闸策略,增加了分析问题的难度。该文分析实际工程中的各类混合式/机械式DCCB工作原理,依据外特性等效原则,提炼出可以表征DCCB操作特性的控制参数,进而得到各类DCCB的通用外特性模型,显著简化多类型DCCB的仿真建模工作。然后,理论分析DCCB开断后故障线路上残压的自然分布特性及产生机理,发现无法直接利用残压自然分布特性区分永久性和部分瞬时性故障。接着,提出基于卸荷电阻的故障性质识别方法和自适应重合闸方法。该方法具有通用性强、系统冲击小、抗过渡电阻能力强等优点。最后,在PSCAD中进行仿真算例分析,验证了所提DCCB外特性模型和重合闸策略。DC circuit breaker(DCCB) is the key equipment for DC power system. Due to the diverse topologies and different operating characteristics, multi-type DCCBs might be configured at the same project. In this case, detailed modeling and reclosing of multi-type DCCBs are involved to study the fault isolation and recovery in system level, resulting in the increase of research difficulty. The working principles of typical hybrid/mechanical DCCB were presented, and with the equivalence of external characteristic(Volt-Ampere curve),universal model that can be used to simulate multi-type DCCB was established in PSCAD. Then, the natural residual voltage distribution pattern of the fault line after DCCB interruption was revealed and its mechanism was analyzed theoretically.The research shows that only using the natural residual voltage cannot distinguish permanent faults and transient faults.Therefore, to distinguish the fault type, a method based on unloading resistance was proposed for adaptive reclosing of the multi-type DCCB. In the end, study cases were conducted in PSCAD, verifying the universal model and the adaptive reclosing method for the multi-type DCCB.

关 键 词：直流断路器 伏安特性模型 故障线路残压 故障性质识别 卸荷电阻 自适应重合闸 

分 类 号：TM561[电气工程—电器]