一种减少电压互感器的模块化多电平换流器分组控制策略

doi:10.19595/j.cnki.1000-6753.tces.160196

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Abstract Modular multilevel converter (MMC) needs a large number of voltage sensors. Thus, this paper presents a grouping control strategy to reduce voltage sensors. This control strategy divides the 2^N sub-modules into N+1 groups according to the sequence of 2⁰, 2¹, 2²,…, 2^N^-1, 2⁰. Each group of sub-modules is regarded as an entirety, whose switch state must remain the same. A voltage sensor is equipped to detect the capacitance voltage of each group. On the basis of this structure, the corresponding methods of capacitor voltage balance control, average voltage control and modulation are proposed. In the method of capacitor voltage balance control, PI regulator is utilized to stabilize the voltage of each sub-module in all groups; the average voltage control balances the voltage of each sub-module; modulation method is to determine the switch state of each sub-module. This strategy reduces a great number of voltage sensors as well as the cost of MMC system. Finally, the case studies are performed on a 33-level three-phase MMC in Matlab/Simulink, which prove the accuracy of this strategy. Meanwhile, a 9-level single-phase MMC laboratory prototype is built to verify the effectiveness of this strategy.

Key words： Modular multilevel converter sub-module grouping control voltage sensor index grouping

Published: 10 October 2017

PACS:

TM46

Fund:湖南省重点研发计划资助项目（2015GK3012）

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	Articles by authors
	Rong Fei
	Chen Panqing
	Huang Shoudao
	Jiang Yan

Cite this article:

Rong Fei,Chen Panqing,Huang Shoudao等. Sub-Module Grouping Strategy for Reducing the Number of Voltage Sensors in Modular Multilevel Converters[J]. Transactions of China Electrotechnical Society, 2017, 32(18): 186-195.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160196 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I18/186

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