基于拓展移相控制的直流配电网模块化多电平直流变压器

doi:10.19595/j.cnki.1000-6753.tces.L80295

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Abstract This paper analyzes the topology and operation characteristics of MMC-H bridge DC transformer based on modular multilevel converter (MMC) arm and H-bridge, where the MMC adopts staircase modulation and the H-bridge adopts an extended phase shift modulation with an added phase shift. Besides, this paper deduces the expression of the voltage and current of the AC chain inthe DC transformer. The expression of transmission power and algorithm of backflow power are deduced, and the distribution of power variation with parameters is analyzed. The factors that affect the backflow power are summarized, and the optimized voltage regulation ratio is discussed. Zero-backflow-power boundary conditions and backflow power optimized working area are condensed. In order to suppress the backflow power, this paper proposes a backflow power optimized strategy that DC transformer works in the optimized working area by adjusting of the inner/outer phase-shift, which reduces the backflow power and current stress. Finally, a physical prototype is built to verify the optimized strategy by experimental results.

Key words： Modular multilevel converter DC transformer extended phase-shift backflow power optimized working area

Received: 01 July 2018 Published: 17 July 2019

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TM46

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	Guan Zhou
	Mei Jun
	Ding Ran
	Ge Rui
	Fan Guangyao

Cite this article:

Guan Zhou,Mei Jun,Ding Ran等. Modular Multilevel DC Transformer for DC Distribution Application Based on Extended Phase-Shift Control[J]. Transactions of China Electrotechnical Society, 2019, 34(13): 2770-2781.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80295 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I13/2770

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