基于电流滞环型调制的模块化多电换器容错策略研究

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Abstract Modular Multilevel Converter (MMC) is a novel topology of Voltage Source Converter (VSC). The protection issues of the malfunction of the sub-module are difficult to handle with. With regard to this problem, the fault-tolerant control based hysteresis-band current tracking strategy, which is used for the MMC, is proposed in the paper. The output voltage can be determined by real-time monitoring the voltage of the load and the deviation between the output current and the given current. Thus, the output current can track the given current quickly and efficiently. When the malfunction occurs in the sub-module, which then must be cut off, and the output voltage should be restructured. The upper/lower arm will be protected from overcurrent. The whole system can still be running smoothly before the fault has been repaired. In addition, the voltage of the capacitor in the sub-module can be balanced by loop mapping the constructed virtual sub-module into the actual sub-module. The proposed strategy is simple and reliable for the control of MMC. According to the simulation and experimental results, the correctness and validity of the proposed method are verified.

Key words： Modular multilevel converter Hysteresis-band current tracking strategy Malfunction of the sub-module Fault-tolerant control Voltage balancing control

Received: 10 July 2014 Published: 08 September 2015

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	Articles by authors
	Ji Yu
	Mei Jun
	Lu Yu
	Zheng Jianyong
	Du Xiaozhou
	Ma Tian
	Miao Huiyu

Cite this article:

Ji Yu,Mei Jun,Lu Yu等. Research on the Hysteresis-band Current Tracking Strategy based on Fault-Tolerant Control for Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 269-277.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I14/269

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