级联型电力电子变压器电压与功率均衡控制方法

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Abstract For cascaded multilevel converter based power electronic transformer (PET), the unbalance of DC output voltage of each rectifier or power transmission in each dual active bridge (DAB) module may lead to uneven voltage or current stress among switches. This paper presents a strategy to solve voltage imbalance and power imbalance caused by parameter mismatch of each DAB module. Wherein, a voltage balance control strategy is adopted in multilevel rectifier stage, while a sensorless power balance control strategy is adopted for the modular DAB converter. Regarding the power balance realization, the active power component of the duty cycle in the rectifier stage is used as power feedback to adjust the duty cycle of each DAB module. These two control methods operate coordinately, to balance the DC output voltage of each rectifier and transfer power in each DAB module. Furthermore, the power balance control algorithm can be easily realized by DSP without current sensor. Finally, simulation and experimental data in a cascaded multilevel converter based PET have verified the proposed strategy.

Key words： Cascaded multilevel converter based power electronic transformer voltage balance power balance parameter mismatch current sensorless control

Received: 06 April 2016 Published: 02 December 2016

PACS:

TM46

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	Articles by authors
	Wang Shanshan
	Wang Yubin
	Lin Yifei
	Yu Chenghao
	Li Houzhi

Cite this article:

Wang Shanshan,Wang Yubin,Lin Yifei等. Voltage and Power Balance Control for Cascaded Multilevel Converter Based Power Electronic Transformer[J]. Transactions of China Electrotechnical Society, 2016, 31(22): 92-99.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I22/92

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