基于EMTP仿真平台的超高压电缆操作过电压特性及其影响研究  

Characteristics and Influence of Switching Overvoltage in Extra High Voltage Cables Based on EMTP

作　　者：李嘉明 于沛鑫 邓军波[1] 赵学风 LI Jiaming;YU Peixin;DENG Junbo;ZHAO Xuefeng(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710100,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [2]国网陕西省电力有限公司电力科学研究院,陕西西安710054

出　　处：《智慧电力》2021年第10期83-89,共7页Smart Power

基　　金：国家自然科学基金资助项目(52077167)。

摘　　要：随着330 kV超高压电缆在西北电网的应用,暴露出电缆过电压特性方面仍存在诸多亟待解决的问题。首先在电磁暂态仿真(EMTP)平台建立典型的超高压电缆过电压仿真模型,对架空线和电缆线路中过电压的幅值变化研究对比,结果表明电缆线路的过电压幅值整体低于架空线路。然后应用模域回路理论对过电压的传播特性与主导频率特性进行分析,结果表明相同条件下,电缆线路操作过电压主导频率相对较低,传播模电压衰减严重,从而影响了过电压的最大值。仿真结果证明超高压电缆在形成操作过电压的同时,会导致下一级出线电缆送电端电压的稳定性受到影响。With the application of 330 kV EHV cables in northwest power grid,it is important to investigate the characteristics with their impact of transient switching overvoltage in EHV cable lines.Firstly,the simulation model of typical 330 kV cable line is built in electromagnetic transients program,and the amplitude variation of the overvoltage in overhead line and the cable line is calculated,showing that the overvoltage amplitude of the cable is relatively lower than that one of the overhead line.Then the propagation and dominant frequency characteristics of the overvoltage are analyzed with the application of return circuit theory in modal theory.Under the same conditions,the dominant frequency of the overvoltage in the cable is lower,and the propagation mode voltage decays seriously,affecting the maximum value of the overvoltage.Finally,simulation results show that the voltage stability of the outlet cable is affected during the electro-magnetic transients in 330 kV cable lines.

关 键 词：超高压电缆 操作过电压 主导频率 谐振过电压 

分 类 号：TM864[电气工程—高电压与绝缘技术]