海上风电低频输电线路时域模型识别纵联保护  

Pilot protection based on time-domain model recognition for low-frequency transmission lines of offshore wind power

作　　者：张健康 李怀强 任龙飞 蒋嘉桁 张晨浩 宋国兵[2] ZHANG Jiankang;LI Huaiqiang;REN Longfei;JIANG Jiaheng;ZHANG Chenhao;SONG Guobing(Northwest Branch of State Grid Corporation of China,Xi’an 710048,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国家电网有限公司西北分部,陕西西安710048 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力自动化设备》2025年第5期101-109,共9页Electric Power Automation Equipment

基　　金：中央高校基本科研业务费专项资金资助项目(xzy022023093);国家电网有限公司西北分部科技项目(SGTYHT/21-JS-223)。

摘　　要：海上风电低频输电系统电源特征不同于传统同步机系统,且线路两端额外装设并联电抗器,导致传统电流差动保护和面向陆上风电送出系统的时域模型识别纵联保护并不适用。为此,总结海上风电低频输电系统源自频率降低、电源控制策略和并联电抗器的线路保护需求,以原有时域模型识别纵联保护原理为基础,研究适用于海上风电低频输电线路的保护原理。提出并联电抗器电流补偿算法,并结合Bergeron模型公式提出不需要对端电压的新保护原理及判据。同时,提出基于瞬时电压的启动元件,并依据输电线路模型适用频带设计了滤波器。通过仿真实验验证所提保护原理正确性并检验保护判据的性能。The source characteristics of low-frequency transmission system of offshore wind power are different from those of traditional synchronous machine system,and the additional installation of shunt reactors at both ends of the transmission line makes that traditional current differential protection and time-domain model recognition pilot protection designed for onshore wind farm transmission system are not applicable.To address this,the requirements for transmission line protection in low-frequency transmission system of offshore wind power are summarized,which arise from the frequency reduction,source control strategy and shunt reactor.Building upon the original time-domain model recognition pilot protection,the protection principle suitable for the low-frequency transmission lines of offshore wind farm is investigated.A shunt reactor current compensation algorithm is proposed,and in conjunction with the Bergeron model formulation,a novel protection principle and criterion that do not require the remote-end voltage are proposed.Additionally,a starting component based on instantaneous voltage is suggested,and the filter is designed according to the suitable frequency band of transmission line model.Simulation experiments are conducted to verify the correctness of the proposed protection principle and to evaluate the performance of the protection criteria.

关 键 词：海上风电低频输电系统 时域模型识别 纵联保护 并联电抗器 Bergeron模型 启动元件 模型适用频带 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程] TM77[电气工程—电力系统及自动化]