直流侧故障对模块化多电平换流器的影响研究  

Research on the effect of DC side fault on modular multilevel converter

作　　者：刘思源[1] 徐东旭[2] 梅念[1] 付颖[1] 刘崇茹[2] LIU Siyuan XU Dongxu MEI Nian FU Ying LIU Chongru(State Grid Beijing Economic Research Institute, Beijing 102209, China State Key Lab of New Energy Power System, North China Electric Power University, Beijing 102206, China)

机构地区：[1]国网北京经济技术研究院,北京102209 [2]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电力系统保护与控制》2017年第10期48-54,共7页Power System Protection and Control

基　　金：国家自然科学基金项目(51277068);教育部新世纪优秀人才支持计划(NCET-12-0846);高等学校学科创新引智计划("111"计划)(B08013);国家高技术研究发展计划(863计划)项目资助(2015AA050101)~~

摘　　要：对于直流侧双极性短路故障,首先分析了故障通路对电容闭锁充电以及故障对交流侧功率的影响,然后对如何减少故障对交流侧无功的影响提出了建议。对于直流侧单极接地故障,通过仿真换流站不同接地电阻下,故障对系统稳定性的影响,对接地电阻的选择提供了建议。对于直流侧断线故障,分析了故障发生后控制器的作用,并给出了不同控制方式下,故障对系统稳定性的影响。此外,就双极短路和断线故障后闭锁时刻对系统的影响进行了分析。最后,在PSCAD/EMTDC中建立HBSM-MMC模型验证了分析的正确性。For the DC side bipolar short-circuit fault, firstly, the impact to DC side power and capacitor charging after locking is analyzed, and then the suggestion for reducing the impact of fault on the AC side reactive power is proposed. For the DC side monopole ground fault, simulation results show the impact that the stability of the system is connected with the values of the grounding resistors, and suggestion is proposed in grounding resistor choice. For the DC side disconnection fault, it draws a conclusion for the stability of the system in different control modes. In addition, the impact of the locking time on the system is analyzed. Finally, the correctness of the above analysis is verified by the simulation of a single ended and double ends halfbridge sub-module DC converter system in PSCAD/EMTDC.

关 键 词：HBSM 双极性短路故障 单极短路故障 断线故障 短路电流 

分 类 号：TM46[电气工程—电器] TM721.1