Research On The New Topology And Intelligent Control Of Power Electronic Transformer

The Power Electronic Transformer is a convertible device which contains power electronic converter and makes use of high-frequency transformer realizing the magnetism coupling, it converts voltage and transfers energy by power electronic technology and the high-frequency transformer. Its prominent characteristic is smaller and lighter than the traditional transformer, a flexible control for the main and subsidiary side voltage amplitude and phase can be also achieved respectively, it can satisfy many new requests of future power system. Therefore, it is necessary that study its topology structure and the control schemes.Firstly, some typical schemes of the Power Electronic Transformer are generalized in this paper, and the topology structure and control strategy of PET's subassembly are analyzed in detail.Secondly, introduced the basic knowledge of the Matrix Converter, carried out whose equivalent AC-DC-AC structure, and suggested that the new topology of Power Electronic Transformer based on Matrix Converter.Thirdly, SPWM strategy has been put in the main side of PET, studied the voltage compensation control schemes under the grid with non-ideal input, brought out the feedforward and feedback compensation control, and carried out Matlab/ Simulink emulation.Finally, it applied the Intelligent Control Theory into feedback compensation control scheme, designed the fuzzy adaptive PID controller and expert PID controller respectively, opens up the field and laid down the basis for the further study of PET.