A Comprehensive AC Fault Ride-through Strategy for HVDC Link with Serial-connected LCC-VSC Hybrid Inverter
作者机构：China Electric Power Research InstituteBeijing 100192China School of Electrical Engineering and AutomationWuhan UniversityWuhan 430072Hubei provinceChina
出 版 物：《CSEE Journal of Power and Energy Systems》 (中国电机工程学会电力与能源系统学报（英文）)
年 卷 期：2022年第8卷第1期
页 面：175-187页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学]
主 题：AC fault-ride through strategy commutation failure DC chopper DC overvoltage serial-connected LCC-VSC hybrid inverter
摘 要：An HVDC link with line-commutated converter(LCC)as a rectifier at the power sending end and with a serial-connected LCC and voltage source converter(VSC)hybrid inverter(SLVHI)at the power receiving end,has been adopted for the forthcoming Baihetan HVDC engineering project in *** realize the AC fault ride-through(FRT)of SLVHI,a new strategy based on DC chopper(DCC)is proposed in this ***,the mathematical model is built to investigate the VSC DC overvoltage mechanism after SLVHI commutation failure(CF)and related ***,a modified DCC topology of SLVHI is designed to adjust the unbalanced power dissipation based on voltage drop ***,an enhanced voltage-dependent current order limiter(VDCOL)is proposed to deal with the unbalanced power after DCC *** the cooperation between modified DCC and enhanced VDCOL,the proposed FRT strategy can realize CF mitigation and VSC DC overvoltage suppression ***,the inverter side AC FRT performances of the HVDC link with SLVHI were studied using PSCAD software/EMTDC *** simulation results validate the effectiveness and superiority of the proposed strategy,with better CF mitigation and VSC DC overvoltage suppression abilities than offered by other existing FRT strategies under different fault scenarios.
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