高电压技术2017，Vol.43Issue(11)：3528-3533,6.DOI:10.13336/j.1003-6520.hve.20171031006
柔性直流输电系统电缆护套过电压仿真
Simulation of Cable Sheath Over-voltage in VSC-HVDC System
摘要
Abstract
Reliability of DC cable is the key factor to ensure the voltage-sourced converter-based high voltage direct current (VSC-HVDC) transmission,so analysis of cable body fault will provide basis for designing DC cables as well as protecting transmission lines in VSC-HVDC system.We established a γ-type underground cable model with distributed RLC parameters based on π-type underground cable model with distributed parameters.Meanwhile,Xiamen VSC-HVDC demonstrating project was applied to Matlab/Simulink for the fault characteristics of underground cable system when main insulation faulted.The simulation results show that fault current and induced voltage in sheath are both related to fault place of the main insulation,and the peak values of fault current increase as the fault point becomes closer to one side of the converter station,meanwhile,distributed induced voltages in metal sheath at both fault side and converter side of the DC cable increase as well.Besides,after the main insulation fault occurs at different distances from converter station,the induced overvoltage distribution trend of each unit in single-end grounding system is similar to that of the double-end grounding system,and the induced voltage value in the metal sheath can be hundreds to thousands of Volt.The model of sheath grounding with single-end can be used to analyze the fault characteristics of double-end grounded system approximately.关键词
VSC-HVDC/直流电缆/绝缘故障/故障特性/过电压Key words
VSC-HVDC/DC cable/insulation fault/fault characteristics/over-voltage引用本文复制引用
孙毅,张轶,贺之渊,尚康良..柔性直流输电系统电缆护套过电压仿真[J].高电压技术,2017,43(11):3528-3533,6.基金项目
国家重点研发计划(2016YFB0900700) （2016YFB0900700）
国家电网公司科技项目(±500 kV柔性直流海缆关键技术研究:直流电缆附件制备关键技术研究).Project supported by National Key Research and Development Plan (2016YFB0900700),Science and Technology Project of SGCC(Research on Key Technologies for ±500 kV Direct Current Cable:Research on Key Technologies for the Preparation of DC Cable Accessories). （±500 kV柔性直流海缆关键技术研究:直流电缆附件制备关键技术研究）
