电机与控制应用2024，Vol.51Issue(1)：49-59,11.DOI:10.12177/emca.2023.170
混合直流系统中直流侧故障暂态电流的解析表达与故障特性的研究
Research on Analytical Expression of DC Side Fault Transient Current and Fault Characteristics in Hybrid HVDC System
摘要
Abstract
The hybrid high voltage direct current(HVDC)transmission system consists of the line-commutated converter based HVDC(LCC-HVDC)transmission system and the voltage source converter based HVDC(VSC-HVDC)transmission system,which have different fault characteristics than conventional HVDC transmission system.To solve this problem,the DC side fault transient current characteristics in hybrid DC transmission systems are investigated.Firstly,a two terminal hybrid HVDC transmission system with LCC converter station in the sending-end grid and VSC converter station in the receiving-end grid is established.The equivalent circuit in case of DC side fault is derived by using laplace transform theorem,and the simple expressions of DC fault current on LCC side and VSC side are analyzed.Secondly,on the basis of the simple expressions,the accurate fault current expressions on both sides are further analyzed by fully considering the dynamic change process of the trigger angle of the LCC converter station at the sender side and the feed-in of the AC current from the VSC converter station at the receiver side.Then,the variation characteristics of DC side fault current in three HVDC systems are comparatively analyzed in terms of fault current amplitude and harmonic.Finally,the correctness of the proposed analytical expression of DC side fault current is verified by MATLAB/Simulink simulation.关键词
线性换流器高压直流输电(LCC-HVDC)/电压源换流器高压直流输电(VSC-HVDC)/混合直流输电/直流故障特性/触发角/交流电流馈入Key words
line-commutated converter based on high-voltage direct current(LCC-HVDC)/voltage source converter based on high voltage direct current(VSC-HVDC)/hybrid HVDC transmission/DC fault characteristics/trigger angle/the feeding of AC current分类
信息技术与安全科学引用本文复制引用
李涛,胡迪,刘宏达,杨为,陈忠,官玮平..混合直流系统中直流侧故障暂态电流的解析表达与故障特性的研究[J].电机与控制应用,2024,51(1):49-59,11.基金项目
国家电网有限公司总部管理科技项目(5500-202220110A-1-1-2N) （5500-202220110A-1-1-2N）
国家自然科学基金-国家电网公司智能电网联合基金资助项目(U2066210)Science and Technology Project of Headquarters of SGCC(5500-202220110A-1-1-2N) （U2066210）
The National Natural Science Founda-tion of China-State Grid Joint Fund for Smart Grid(U2066210) （U2066210）
