海上风电高抗匝间保护误动分析及对策建议  

Maloperation analysis and suggested countermeasures for inter-turn protection of high-voltage shunt reactors in offshore wind power transmission

作　　者：曹文斌 潘武略 戚宣威 陈水耀 方芳 陈旭 CAO Wenbin;PAN Wulue;QI Xuanwei;CHEN Shuiyao;FANG Fang;CHEN Xu(State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;EHV Branch Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014 [2]国网浙江省电力有限公司,杭州310007 [3]国网浙江省电力有限公司超高压分公司,杭州310007

出　　处：《浙江电力》2023年第1期54-62,共9页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司科技项目(5211DS22000U)。

摘　　要：针对现场频发的海上风电输电海缆高压并联电抗器(以下简称“高抗”)匝间保护在常规分、合闸操作过程中的误动问题,开展了误动场景分析并提出相应对策建议。首先,对比不同厂家的匝间保护原理并解析不同操作场景下的误动过程。接着,总结出合闸时因铁心饱和产生零序源而被误判为内部故障及谐振期间电流幅值增大导致测量阻抗减小是保护误动的原因。然后,通过仿真复现了现场操作场景下的录波波形,验证了理论分析的正确性。最后,提出增加零序涌流谐波闭锁判据、增加谐振频率识别判据、操作时高抗侧开关先合后分等防误动措施。Misoperation of the inter-turn protection of high voltage shunt reactors(HVSRs)frequently occurs in submarine cables for offshore wind power transmission during conventional opening and closing operations.The misoperation scenarios are analyzed,and corresponding countermeasures are put forward.Firstly,the inter-turn protection principles of different manufacturers are compared,and the misoperation processes under different operation scenarios are examined.Secondly,it is concluded that the core saturation generates a zero-sequence source during closing.The decreased measured impedance due to the increased current amplitude during resonance results in protection misoperation.Thirdly,the waveforms recorded in the field operation scenario are reproduced via simulation to verify the correctness of the theoretical analysis.Finally,it is suggested to adopt misoperation countermeasures,such as increasing the zero-sequence inrush current harmonic blocking criteria,resonant frequency identification criteria,and opening the switch on the high-reactance side and closing it afterward during operation.

关 键 词：高压并联电抗器 匝间保护 铁心饱和 LC谐振 

分 类 号：TM614[电气工程—电力系统及自动化] TM472