摘要
特高压半波长交流输电技术可以实现远距离大容量的输电,对于特高压输电网络建设和清洁能源在全国的积极消纳具有非常重要的意义。但当线路空载、甩负荷或者出现单相接地短路时,特高压半波长交流输电系统沿线会出现不同程度的工频过电压。针对此问题,提出一种在特高压半波长输电系统沿线优化配置金属氧化物避雷器来抑制沿线工频过电压的方法。在分析特高压半波长交流输电系统工频过电压特性和研究运用金属氧化物避雷器抑制特高压半波长输电系统工频过电压理论的基础上,提出在特高压半波长输电系统沿线布置金属氧化物避雷器的最优抑制方案,并利用特高压半波长交流输电系统的典型参数,建立仿真模型来对比研究在没有金属氧化物避雷器和优化配置金属氧化物避雷器两种情况下系统工频过电压水平。仿真结果表明,在特高压半波长输电系统线路沿线等距布置11组及以上数目的金属氧化物避雷器,可以有效地抑制线路的工频过电压并能满足单一避雷器的通流容量要求。研究成果为特高压半波长交流输电系统工频过电压的抑制提供了有效的方案。
Ultra-high voltage(UHV) half-wavelength AC transmission technology can achieve long-distance and large-capacity power transmission. This technology is of great significance for UHV transmission network construction and accommodation of clean energy throughout China. However, in cases of no-load lines, load rejection or short-circuit fault, there will be different levels of overvoltage along the UHV half-wavelength AC transmission lines. Aiming at this problem, this paper proposes a metal-oxide surge arrester optimal configuration method along the lines to suppress the overvoltage. The characteristics of overvoltage in half-wavelength AC transmission system is analyzed and the theory of using metal-oxide surge arresters to suppress power frequency overvoltage is studied. On this basis, the optimal metal-oxide surge arresters’ configuration scheme along the lines is proposed. Then a simulation model is established using typical parameters of UHV half-wavelength AC transmission system to compare the overvoltage levels between conventional configuration without the arresters and optimal configuration with the arresters. Simulation results show that the configuration scheme with 11 or more metal-oxide surge arresters along the UHV half-wavelength transmission lines can suppress the overvoltage effectively and well satisfy single metal-oxide surge arrester’s flow capacity. The research results provide an effective solution for suppressing overvoltage of the UHV half-wavelength AC power transmission system.
作者
易俊
胡伟
陈迅
邱璐
张子杰
胡博
黎灿兵
YI Jun;HU Wei;CHEN Xun;QIU Lu;ZHANG Zijie;HU Bo;LI Canbing(Hunan University),Changsha 410082,Hunan Province,China;State Key Lab of Control And Simulation of Power System and Generation Equipments (Dept,of Electrical Engineering, Tsinghua University),Haidian District,Beijing 100084,China;Hunan Key Laboratory of Intelligent Information Analysis and Integrated Optimization for Energy Internet (Hunan University),Changsha 410082,Hunan Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第6期2227-2234,共8页
Power System Technology
基金
国家电网公司科技项目(SGTYHT/15-JS-191)
Science and Technology Project of State Grid Corporation of China(SGTYHT/15-JS-191)
关键词
特高压
半波长交流输电
过电压
金属氧化物避雷器
过电压抑制
ultra-high voltage
half-wave length AC transmission
overvoltage
metal-oxide surge arresters
overvoltage suppression
