混合式配电变压器的动态模型与内环控制系统

doi:10.19595/j.cnki.1000-6753.tces.L90170

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Abstract Comparing with the traditional distribution transformer, hybrid distribution transformer (HDT) can regulate the partial load power by the integrated PWM converters. Therefore, HDT can not only change the voltage rate and transfer the load power just as the traditional transformer, but also can control the grid current and load voltage in real time. Hence, HDT is a promising equipment for the intelligence of the active distribution network. In this paper, an improved HDT configuration and the three-phase circuit scheme of HDT is presented. In this scheme, the converter with sample topology can be applied and the rated voltages of all the units can be easily determined. Based on the equivalent circuit of the present HDT, the transfer function model is established, then the PI controller is adopted to construct the inner control system of HDT. Both the simulation and experiment are performed in the condition of nonlinear load and fluctuated grid voltage. The results shows that the grid side current can be regulated to be sinusoidal, symmetrical and unit power factor, the load voltage can be controlled to be stable. Which verifies the correctness of the established dynamic model and the presented control strategy.

Key words： Active distribution network equivalent circuit hybrid distribution transformer PI controller transfer function

Received: 30 June 2020

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TM421

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	Liu Yibin
	Liang Deliang
	Wang Yuheng
	Gao Yachen
	Zhang Lishi

Cite this article:

Liu Yibin,Liang Deliang,Wang Yuheng等. Dynamic Model and Inner Loop Control System of Hybrid Distribution Transformer[J]. Transactions of China Electrotechnical Society, 2021, 36(7): 1537-1546.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90170 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I7/1537

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