Design and Simulation Research of Electromagnetic-electronic Hybrid Distribution Transformer

With the development of the power system, the requirements for the performance of distribution transformers are increasing day by day. Traditional transformers have problems such as poor voltage regulation performance and easy voltage overrun, which seriously affect the stability and quality of power supply, which brings challenges to the safe and reliable operation of the power grid. This paper proposes an electromagnetic-electronic hybrid distribution transformer, which combines a traditional transformer and a partial power electronic converter to solve the problems of poor voltage regulation performance and voltage overrun of the traditional transformer. Meanwhile, this paper introduces its system theory, including the design method of multi-winding electromagnetic transformers and the topology and control structure of power electronic converters. This paper also constructs an AC-DC-AC converter voltage regulation system based on fully controlled power semiconductor devices, which regulates the voltage by PWM pulse width modulation of the rectifier-inverter circuit. Simulation results confirm the feasibility of the designed electromagnetic-electronic hybrid distribution transformer.