网压不平衡下环流注入对模块化多电平换流器的影响分析

doi:10.19595/j.cnki.1000-6753.tces.180392

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Abstract Based on the switching function, the 3D-graph analysis and the fitting method, this paper proposes a reasonable circulating current injection method to reduce the peak value of arm current and the capacitor voltage ripple of the module under unbalanced grid voltage. The impacts of circulating current injection on the peak value and root mean square value of the arm current as well as the capacitor voltage ripple are analyzed. The best angle to minimize the peak value of arm current and the formula to limit circulation injection amplitude under different conditions are obtained, and the best angle to minimize the capacitor voltage ripple and its limited formula of amplitude are further obtained. Considering the tolerance of current and voltage in sub module, a circulating current injection method is proposed, which can limit peak value of arm current as well as the capacitor voltage ripple. Finally, the correctness of the analysis and the effectiveness of the proposed method are verified in Matlab/Simulink simulation and the experimental platform.

Key words： Modular multilevel converter (MMC) unbalanced grid voltage circulating current injection arm current capacitor voltage ripple

Received: 22 March 2018 Published: 03 September 2018

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TM46

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	Articles by authors
	Shi Enze
	Wu Xuezhi
	Jing Long
	Jiang Jiuchun
	Li Jingke

Cite this article:

Shi Enze,Wu Xuezhi,Jing Long等. Analysis of the Impact on Modular Multilevel Converter with Circulating Current Injection under Unbalanced Grid Voltage[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3719-3731.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180392 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I16/3719

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