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一种具备直流故障清除能力的新型MMC子模块拓扑
束洪春1, 王文韬1, 江耀曦2, 邵宗学1, 王锐1, 廖孟黎1
1.昆明理工大学 电力工程学院,云南 昆明 650500;2.昆明理工大学 信息工程与自动化学院,云南 昆明 650500
摘要:
当基于模块化多电平换流器(MMC)的高压直流输电(MMC-HVDC)系统直流线路发生短路故障时,传统半桥子模块存在无法通过闭锁阻断直流故障电流的问题。对此,提出一种具备直流故障清除能力的基于半桥的五电平新型子模块(FLHBSM)拓扑。FLHBSM与传统半桥子模块具有相同的控制结构,并具备了直流故障清除能力。相比其他具备直流故障清除能力的子模块拓扑,FLHBSM减少了开关器件的数量以及换流站占地面积,降低了损耗,且其控制灵活度高,在提高了MMC经济性的同时增强了其运行可靠性。同时,FLHBSM可以较好地兼容适用于半桥子模块的电容均压策略,并可根据实际需要在均压方案中择优。在MATLAB/Simulink仿真平台搭建了基于FLHBSM的双端 ±100 kV 21电平MMC-HVDC系统仿真模型,验证了其利用子模块闭锁模式清除直流故障的有效性。
关键词:  MMC  子模块拓扑  直流故障清除能力  均压策略  经济性
DOI:10.16081/j.epae.202202030
分类号:TM46
基金项目:国家自然科学基金资助项目(52037003);云南省重大科技专项计划(202002AF080001)
Novel MMC sub-module topology with DC fault clearing capability
SHU Hongchun1, WANG Wentao1, JIANG Yaoxi2, SHAO Zongxue1, WANG Rui1, LIAO Mengli1
1.Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China;2.Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China
Abstract:
When short circuit fault occurs on DC line of MMC-HVDC(High Voltage Direct Circuit based on Modular Multilevel Converter) system, the DC fault current cannot be blocked by traditional HBSM(Half-Bridge Sub-Module). In this regard, a FLHBSM(novel Five-Level Half-Bridge Sub-Module) topology is proposed. FLHBSM has the same control structure as HBSM with the addition of DC fault clearing capability. Compared with other sub-module topologies with DC fault clearing capability, FLHBSM reduces the number of switching devices and the area occupied by the converter station, reduces the loss and provides high control flexibility, and not only improves the economy of MMC, but also enhances its operation reliability. Meanwhile, FLHBSM can be compatible with the capacitor voltage balancing strategies suitable for HBSM, and can choose better capacitor voltage balancing strategy according to the actual needs. A simulation model of bi-terminal ±100 kV 21-level MMC-HVDC system based on FLHBSM is built on MATLAB/Simulink platform, which verifies the effectiveness of DC fault clearing capacity by using FLHBSM.
Key words:  MMC  sub-module topology  DC fault clearing capability  voltage balancing strategy  economy

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