基于占空比同步的电力电子变压器低压交流端口模式切换控制

doi:10.19595/j.cnki.1000-6753.tces.210915

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Abstract Multi-port power electronic transformer(PET) is the critical equipment in the future smart grid and is applied to new energy generation, hybrid AC-DC grid and DC(data center) power supply system. When multiple PETs are running in cluster, function of interconnection, information sharing, complementation and optimization is provided. Thus, mode transition which is the base of the cluster running is significant for the PETs. A duty cycle synchronization based mode transition method was proposed for a PET cluster demonstration system. The proposed method can effectively reduce the mode transition impact while the similar control scheme is not required for master and slave inverter. The impedance characteristics of the parallel inverter system were analyzed by the harmonic linearization method, which explained the reason of system oscillation during mode transition.Thus, the multi-step switchover method was applied to improve the stability of the mode transition. Finally, the proposed method was verified by mode transition experiments on two parallel MV·A PETs system.

Key words： Power electronics transformer(PET) parallel inverters master-slave structure seamless mode transition

Received: 21 June 2021

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TM464

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	Yuan Liqiang
	Gao Shen
	Ji Shiqi
	Xiao Fengliang
	Wu Mingkuan

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Yuan Liqiang,Gao Shen,Ji Shiqi等. Mode Transition for Low Voltage AC Port of Power Electronic Transformers Based on Duty Cycle Synchronization[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 729-738.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210915 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I3/729

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