Dynamic Model and Inner Loop Control System of Hybrid Distribution Transformer
Liu Yibin1,2, Liang Deliang1,2, Wang Yuheng1,2, Gao Yachen1,2, Zhang Lishi1,2
1. State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China; 2. Shaanxi Key Laboratory of Smart Grid Xi'an 710049 China;
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.
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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2021, Vol. 36 
