摘要
基于模块化多电平换流器的柔性直流输电技术(MMC-HVDC)是消纳可再生清洁能源,构建直流电网的核心技术。输电线路短路故障是直流电网常见故障,其故障电流水平影响着直流电网关键设备的参数设计。以张北直流电网为对象,通过网络开环、健全极开路、接地支路独立化和戴维南等效等方法,逐步解耦降阶,建立了去耦合的单端口简化模型。提出了直流电网短路故障的单端化近似解析计算方法。所提计算方法在PSCAD/EMTDC仿真平台上得到了验证,对故障电流影响因素分析和故障电流水平抑制具有参考意义。
MMC-HVDC is the core technology to absorb renewable clean energy and construct DC power grid.Short-circuit fault of transmission line is a common fault in DC power grid,and its fault current level affects the parameter design of key equipment in DC power grid.Taking Zhangbei DC power grid as the research object,by means of network open-loop,healthy pole open circuit,independence of grounding branch and Thevenin equivalent method,the order of the circuit decreases gradually,and a decoupled single port simplified model is established.A single terminal approximate analytical method for DC power system short-circuit fault is proposed.The proposed calculation method has been verified on PSCAD/EMTDC simulation platform,which has reference significance for fault current influence factor analysis and fault current level suppression.
作者
刘麒麟
张英敏
张明奇
陈若尘
彭宇峰
Liu Qilin;Zhang Yingmin;Zhang Mingqi;Chen Ruochen;Peng Yufeng(School of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《电测与仪表》
北大核心
2023年第3期47-52,共6页
Electrical Measurement & Instrumentation
基金
国家重点研发计划项目(2018YFB0904600)。
