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	一种具备直流清除能力的MMC换流器改进拓扑
	李笑倩 ; 刘文华 ; 宋强 ; 饶宏 ; 朱喆 ; 黎小林 ; LI Xiaoqian ; LIU Wenhua ; SONG Qiang ; RAO Hong ; ZHU Zhe ; LI Xiaolin
	2016-03-30 ; 2016-03-30
关键词	模块化多电平换流器 直流线路故障 瞬时性故障 故障清除 故障恢复 TM46 TM721.1
其他题名	An Enhanced MMC Topology With DC Fault Clearance Capability
中文摘要	基于模块化多电平换流器(modular multilevel converter,MMC)的柔性直流输电系统(flexible high voltage DC transmission based on MMC,MMC-HVDC),在可再生能源的远距离电力输送方面富有潜力。直流线路故障是MMC-HVDC必须解决的关键问题。提出一种具有直流故障穿越能力的MMC改进拓扑。该拓扑基于二极管嵌位式双子模块,利用子模块电容电压来抑制直流故障的二极管续流效应,关断故障电流通路,从而迅速地清除故障电流。对于瞬时性直流故障,由于故障清除过程中无需断开交流断路器,MMC还能够快速重启、恢复供电。这种改进拓扑附加功率器件的额定电压仅为常规功率器件的一半,额外成本较低。达到同等电压等级,所需子模块数目仅为常规设计的一半,降低了脉冲控制的设计难度和硬件成本。基于PSCAD仿真平台的结果验证了文中所提拓扑和保护方法的有效性。; High-voltage direct current system using modular multilevel converter(MMC-HVDC) is a potential candidate for the grid integration of renewable energy over-long distances. The dc-link fault is an issue which MMCHVDC must deal with. This paper proposed an enhanced MMC topology with dc fault clearance capability. Adopting diode clamp double sub-modules, the freewheeling effect of diodes is eliminated by the sub-module capacitor voltages, and fault-current path is cut off and thus fault currents can be extinguished rapidly. Since the tripping of ac circuit breakers is avoided, MMC can immediately restart power transmission for non-permanent faults. The required rated voltage of additional semiconductors is half the conventional semiconductors, resulting in low extra cost. The number of sub-modules required to achieve the same dc-link rated voltage is halved, leading to simplification and cost reduction of pulse generator. Simulation results using PSCAD/EMTDC have verified the validity of the proposed topology and protection scheme.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/142666]
专题	清华大学
推荐引用方式 GB/T 7714	李笑倩,刘文华,宋强,等. 一种具备直流清除能力的MMC换流器改进拓扑[J],2016, 2016.
APA	李笑倩.,刘文华.,宋强.,饶宏.,朱喆.,...&LI Xiaolin.(2016).一种具备直流清除能力的MMC换流器改进拓扑..
MLA	李笑倩,et al."一种具备直流清除能力的MMC换流器改进拓扑".(2016).

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