Research And Application Of Power Control System For Transformer

Power electronic transformer is one of the important facilities in power system.Its technological innovation has always been a challenge to the electric power industry.Due to the huge volume of traditional power frequency transformer,the lack of intelligent control measures and DC conversion interface et al,scholars make great effort on the application and design of power electronic transformers.Power electronic transformer,which can not only replace the function of traditional transformer,but also show high flexibility,strong controllability and a variety of AC-DC interface functions in power grid operation,would successfully solve the current problems and promote pressure regulator development.In this paper,the key technologies of power electronic transformer in control and application were explored.By optimizing the MFT design program,the insulation setting,the stray parameter setting and operation,we tried to solve the MFT winding loss,core loss and design and other issues.At the same time,according to the output voltage of three-phase PET caused by the unstable situation,the instability of commonly used control methods,and control method of the rectifier is restricted in cascade,put forward to improve the instability.The harmonic optimization problem,the output line voltage,the general expression of the output voltage and the general expression were verified by using the step wave method in the three-phase PET output stage.In addition,this paper also discussed the application of single phase PET in the field of electric rail transport,as well as the application of three-phase PET in the DC micro grid,and this provide reference for the application of power electronic transformer in power grid.In all,power electronic transformer needs to be further explored on the optimization of PET protection device,the setting parameters of PET,high voltage DC side to take power,stability analysis and so on.