Study on Simulation Model of Power Electronic Transformer (PET)

The thesis has completed the following research work: 1. After reviewing the development process, research background, and application field of PET, the advantages of PET are summarized, and then the research object of this paper is AC/DC/AC including DC port and the key technical problems that need to be solved. 2. This thesis has established the mathematical model of PET at all levels of AC/DC/AC type structure. The input stage is composed of a PWM rectifier circuit, and the circuit working principle, mathematical model, and control strategy are analyzed in detail. The isolation stage theoretically analyzes the working modes of the circuit topology in each time period. The output stage consists of a unipolar inverter circuit and an LC filter. 3. In the simulation environment of Matlab/Simulink, according to the design parameters, the simulation model of the main circuit of the PET rectifier stage, isolation stage, and inverter stage, as well as the simulation model of the whole machine system are built under the 1kv voltage level.