模块化多电平型变流器电容电压波动及其抑制策略研究

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Abstract In modular Multilevel Converter(MMC),analysis was made based on the power flow and energy fluctuation,in order to discuss the mathematical expression of the module capacitor voltage in the upper and lower arm.The relationships between the capacitor voltage’s fluctuation and the circular current and transferred power have been analyzed.Moreover,a capacitor voltage suppression algorithm is developed by controlling the secondary component of the circular current,which is obtained from the instantaneous value of the output current and the reference signal of the phase leg.A circular current close-loop controller is designed based on the proportional resonance to suppress the capacitor voltage fluctuation.The controller design is simple because it has no second-order negative-sequence coordination transformation and phase decoupling control.The simulation results show that this method can effectively suppress the ripple of the capacitor voltage and enhance the quality of the output voltage without increasing the capacitance.

Key words： Modular multilevel converter submodule capacitor voltage ripples proportional resonant (PR) control circular current control

Received: 06 November 2014 Published: 25 May 2015

PACS:

TM315

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	Huang Shoudao
	Peng Yelun
	Liao Wu

Cite this article:

Huang Shoudao,Peng Yelun,Liao Wu. Study of Capacitor Voltage Fluctuation and Its Suppression for Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2015, 30(7): 62-71.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I7/62

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