电气传动2019，Vol.49Issue(12)：102-108,7.DOI:10.19457/j.1001-2095.dqcd19052
MMC-HVDC系统结构对多端直流电网故障的影响分析
Impact Analysis of MMC-HVDC System Topology on Multi-terminal DC Network Faults
摘要
Abstract
DC fault characteristics of multi-terminal HVDC based on MMC were studied. Firstly ,a general analysis method of DC ground fault current paths for different MMC-HVDC system structures was proposed based on the steady-state operating characteristics and short-circuit fault current paths analysis of MMC converters under different system structures. Then,according to the above methodology,the influence of different grounding schemes on the fault current was investigated,and a method for determining the DC grounding scheme for a multi-terminal DC system was proposed. At last,a comparative analysis for the DC fault current responses of a 5-terminal DC network working under different system structures was carried out. The analyzed results show that the symmetric monopole system has the best pole-to-ground fault current characteristics,and the direct grounding system is most affected by the unipolar fault. At the same time,the simulation results also show that the DC reactors could improve the DC fault current characteristics in all of the DC fault types and MMC-HVDC system structures.关键词
基于MMC的高压直流系统/多端直流电网/系统结构/直流故障/保护配置/直流电抗Key words
high voltage DC(HVDC)system based on modular multilevel converte(r MMC)/multi-terminal DC (MTDC)network/system structure/DC faults/protection configuration/DC reactor分类
信息技术与安全科学引用本文复制引用
李春叶,黄华,孟祥有,李胜..MMC-HVDC系统结构对多端直流电网故障的影响分析[J].电气传动,2019,49(12):102-108,7.基金项目
山西省重点研发计划重点项目(201603D112004) （201603D112004）
