乌东德混合直流工程的高压交流断路器要求  

High-Voltage AC Circuit Breaker Requirements for the Wudongde Hybrid DC Project

作　　者：徐攀腾[1] 尚茂林 朱博 宋述波[1] 李倩[1] 樊友平[2] XU Pan-teng;SHANG Mao-lin;ZHU Bo;SONG Shu-bo;LI Qian;FAN You-ping(China Southern Power Grid Co.,Ltd.,Guangzhou Bureau of UHV Transmission Company,Guangzhou 510700,China;School of Electrical and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司广州局,广州510700 [2]武汉大学电气与自动化学院,武汉430072

出　　处：《电力学报》2021年第3期191-199,227,共10页Journal of Electric Power

基　　金：“南方电网乌东德电站送电广东、广西特高压多端柔性直流示范工程”项目研究成果;国家重点研发计划项目(2016YFB0900903)

摘　　要：±800 kV乌东德特高压多端混合直流输电工程是重大电力行业科技示范项目。其中,送端昆北站汇集了龙开口、鲁地拉等水电站,电站与换流站之间输电线路长,换流站运行压力大,因而对其高压交流断流器的参数要求提出了挑战,依据工程具体实际来制定断路器的技术参数显得十分重要。以乌东德电站送电广东、广西(昆柳龙)直流输电工程为依托,对昆北站中使用的交流断路器工作条件进行了研究。以交流系统及换流站相关数据为依据,如交流系统短路电流,换流变参数,交流滤波器和并联电容器小组、大组参数等。首先给出了昆北换流站的交流换流器分布概况、数量与说明。然后提出了选相合闸的作用和配合逻辑。为了得到交流滤波器和并联电容器大组/小组断路器和换流变断路器的特殊要求数据,通过理论分析和计算得到了额定单个和背靠背电容器组开断电流的大小。实验仿真软件选取PSCAD/EMTDC,模型是由HVDC换流器、换流变、交流滤波器及并联电容器组、交流母线避雷器组成的三相系统,模拟单组断路器的开断、切小组断路器降低交流母线FFOV以及孤岛运行模式等情况下的最大TRV值。从而确定了昆北换流站高压交流断路器的选型要求:(1)交流滤波器小组断路器和换流变断路器应安装选相合闸装置,以减小断路器合闸涌流;(2)交流滤波器和并联电容器大组/小组断路器必须满足工程实际的特殊要求,电容器组涌流峰值/涌流频率计算值,考虑选相合闸装置1 ms误差,昆北站为4.9 kA/2401 Hz;(3)交流系统并联网运行时,交流滤波器大组和小组断路器的最大TRV计算结果为:昆北站交流滤波器小组断路器1319 kV,故障工况及策略为双极运行时,发生单相接地故障,接地故障后100 ms切除线路,1 s后重合闸失败,切除故障线路,同时闭锁双极,再延迟100 ms切除小组滤波器;(4)昆北站交流断±800 kV Wudongde UHV multi-terminal hybrid DC transmission project is a major power industry demonstration project.Among them,the sending end of Kunbei Station brings together hydropower stations such as Longkaikou and Ludila.The transmission line between the station and the converter station is long,and the operation pressure of the converter station is large.Therefore,the parameter requirements of its high-voltage AC current breaker are challenged.It is very important to formulate the technical parameters of the circuit breaker ac-cording to the specific engineering practice.Based on the DC transmission project of Wudongde Hydropower Station to Guangdong Guangxi(Kunli-ulong),the working conditions of AC circuit breakers used in Kunbei Station are studied.The research work is based on the relevant data of AC system and converter station,such as short circuit current of AC system,con-verter transformer parameters,AC filter and shunt capacitor large/group parameters,etc.Firstly,the distribu-tion,quantity and description of AC converters in Kunbei converter station are given.Then the function and co-ordination logic of phase selection closing are proposed.In order to obtain the special requirement datas of AC filter and shunt capacitor large/group circuit breakers and converter circuit breakers,the breaking current of rated single and back-to-back capacitor banks is obtained by theoretical analysis and calculation.PSCAD/EMTDC is selected as the simulation software to simulate the three-phase system composed of HVDC converter,converter transformer,AC filter,shunt capacitor bank and AC bus arrester.The maximum TRV is simulated under the conditions of single group circuit breaker breaking,group circuit breaker cutting down AC bus FFOV and island operation mode.The selection requirements of high voltage AC circuit breaker in Kunbei converter station are summarized and determined:(1)AC filter circuit breaker and converter circuit breaker should be installed phase selection closing device to reduce circuit breaker closi

关 键 词：±800 kV 乌东德特高压直流工程 换流站 交流断路器 暂态恢复电压 PSCAD/EMTDC 最大TRV 

分 类 号：TM561[电气工程—电器]