A Research On Voltage Type High-frequency Link Matrix Inverter

High frequency link inverter is the inverter which can solve some problems inapplication of traditional inverter. There are many advantages in high frequency linkinverter, such as high-frequency electrical isolation, single-stage power conversion,bi-directional power flow and load adaptability. Therefore, it has a good prospects in thesmall and medium power occasions. This paper mainly studied voltage type highfrequency matrix converter.Firstly, it is described the advantages and disadvantages of traditional invertertechnology, then introduced the concept of high frequency link inverter. It also describedthe advantages and disadvantages of high-frequency link inverter technology, thencategorized the high-frequency link inverter simply. It is reviewed the basic principle ofthe matrix converter as well as the research status at home and abroad.Secondly, a variety of modulation methods of the single-phase high frequency matrixinverter is introduced, which are single polar phase shift control, double polaritiesphase-shifting control, de-re-couple modulation strategy and optimized de-re-couplemodulation strategy. The work modals of modulation strategies is analyzed, and thecorresponding computer simulations is demonstrated the theories. This paper finallyselected optimized de-re-couple modulation strategy, and used that method to thethree-phase voltage type high-frequency matrix inverter.Furthermore, the three-phase high frequency matrix inverter mathematical model isestablished, and the detailed harmonic analysis of optimized de-re-couple modulationstrategy is made as followed, which proves the optimized de-re-couple modulationstrategy strictly in theory.Then, it is introduced different control methods of three-phase high frequencyinverter. Pole assignment method is used in the design of controller. Analysis theinductance current inner loop and capacitive current inner loop closed loop strategiesrespectively. To improve the load capacity of the system, combined digitalone-cycle-controlled with double closed-loop, and presents a well control performance. At last, Experiments are conducted to demonstrate the simplicity and effectiveness ofthe optimized de-re-couple modulation strategy and the control methods by using logiccombination of DSP and CPLD.