并联电抗器补偿方案对500 kV海底电缆沿线过电压的分布影响  

Influence of shunt reactor compensation scheme on overvoltage distribution along 500 kV submarine cable

作　　者：曹燕明 李亚男 周滔 罗隆福[2] CAO Yanming;LI Yanan;ZHOU Tao;LUO Longfu(State Grid Power Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]国网经济技术研究院有限公司,北京102209 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力工程技术》2024年第4期127-135,共9页Electric Power Engineering Technology

基　　金：湖南省科技创新重大项目“规模化储能平滑新能源功率控制和稳定电网电压频率技术与装备研究”(2020GK1023)。

摘　　要：交流海底电缆是海上风电场交流输电技术的重要组成部分,但其充电电流问题限制了其在远距离、大容量海上风电中的应用。文中基于HYJQF41-F290/500 kV型号的单芯交流海底电缆,研究了该电缆在远距离、高压输电中不同工况下的沿线过电压分布情况。首先,建立该电缆的仿真模型,并对其参数进行修正。然后,针对并联电抗器的不同补偿度,对单端补偿、两端补偿等配置方案下并联电抗器的容量进行分析计算。最后,基于高压、远距离风电场模型中单相接地故障、合分闸等工况,对不同无功补偿方案下海底电缆沿线过电压的分布规律进行仿真研究。研究结果表明,海底电缆的最大过电压随着补偿方案的不同而出现在不同的位置。基于此,文中给出了在不同补偿方案下高压海底电缆选型以及变电站设备绝缘水平设计时过电压的选取方法,对工程实际具有一定指导意义。AC submarine cable is an important component in AC transmission system of offshore wind farms.However,the issue of charging current limits its application in offshore wind power with long-distance and large-capacity.Taking HYJQF41-F290/500 kV single-core AC submarine cable as an example,the overvoltage distribution along the cable in different working conditions is analyzed,considering the long-distance and high-voltage transmission.The simulation model of the cable is established and its parameters are corrected firstly.According to the different compensation degrees of the shunt reactor,the capacity of the shunt reactor under the configuration scheme of single-end compensation and two-end compensation calculated out.Finally,based on the single-phase grounding fault,the closing and opening conditions in the high-voltage and long-distance wind farm models,and the distribution law of overvoltage along the submarine cable under different reactive power compensation schemes is tested by simulation.The results show that the maximum overvoltage of submarine cables appears in different positions with different compensation schemes.Based on this,the selection methods for high-voltage submarine cable and overvoltage in insulation level design of substation equipment are given out under different compensation schemes,which have certain guiding significance for engineering practice.

关 键 词：海底电缆 充电电流 海上风电 过电压 无功补偿 并联电抗器 

分 类 号：TM726[电气工程—电力系统及自动化]