一种具有直流故障限流能力的模块化多电平换流器
发布时间：2018-10-31 12:02
【摘要】：为解决传统半桥型模块化多电平换流器(MMC)无法限制直流故障电流的问题,提出一种改进型子模块的MMC拓扑。与传统半桥型子模块拓扑不同,交流输出端口增加了阻断IGBT及其旁路吸收回路。本文首先分析改进型子模块的工作原理,在此基础上开展基于该子模块的MMC的故障限流机理及其主要功率开关器件的电气应力的研究,并通过仿真算例对所提出的拓扑进行了验证。仿真结果表明基于改进型子模块的MMC拓扑在原有正常模式下不需要改变控制策略与调制策略,而在故障阶段能够迅速实现故障电流阻断效果,通过引入旁路吸收回路,进一步降低了对电路触发脉冲一致性的要求,因此在未来高压直流输电系统领域具有良好的工程应用前景。
[Abstract]:In order to solve the problem that the traditional half-bridge modularized multilevel converter (MMC) can not limit the DC fault current, an improved MMC topology of sub-module is proposed. Different from the traditional semi-bridge sub-module topology, the AC output port increases the blocking of IGBT and its bypass absorption circuit. In this paper, the working principle of the improved sub-module is analyzed, and the fault current limiting mechanism and the electrical stress of the main power switch devices based on the sub-module are studied. The proposed topology is verified by a simulation example. The simulation results show that the MMC topology based on the improved submodule does not need to change the control strategy and modulation strategy in the original normal mode, but can quickly realize the fault current blocking effect in the fault stage. The requirement of circuit trigger pulse consistency is further reduced, so it has a good application prospect in the field of HVDC transmission system in the future.
【作者单位】： 北京交通大学电气工程学院;
【基金】：大型电气传动系统与装备技术国家重点实验室项目(SKLLDJ042016005) 国家重点研发计划(2016YFE0131700)资助
【分类号】：TM46
[Abstract]:In order to solve the problem that the traditional half-bridge modularized multilevel converter (MMC) can not limit the DC fault current, an improved MMC topology of sub-module is proposed. Different from the traditional semi-bridge sub-module topology, the AC output port increases the blocking of IGBT and its bypass absorption circuit. In this paper, the working principle of the improved sub-module is analyzed, and the fault current limiting mechanism and the electrical stress of the main power switch devices based on the sub-module are studied. The proposed topology is verified by a simulation example. The simulation results show that the MMC topology based on the improved submodule does not need to change the control strategy and modulation strategy in the original normal mode, but can quickly realize the fault current blocking effect in the fault stage. The requirement of circuit trigger pulse consistency is further reduced, so it has a good application prospect in the field of HVDC transmission system in the future.
【作者单位】： 北京交通大学电气工程学院;
【基金】：大型电气传动系统与装备技术国家重点实验室项目(SKLLDJ042016005) 国家重点研发计划(2016YFE0131700)资助
【分类号】：TM46
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