Unidirectional Voltage-source High-frequency Link Inverter

In the field of Power electronies,Inversion Technology Plays an important role.It is the main supporting technology of modern electric drive system and the core technology of Uninterruptible Power Supply.With the inereasing development of teleeommunication,eleetronics technology and Power systems,the consumers need demands higher requirement for the performance,weight,volume,efficieney,reliability and environment proteetion of power source.Under such baekground a new high technology field called High-frequeney Link Inverter receives enough attention and flourishs development.For high-frequency link inverter and digital power technology, the importance and necessity of researching and realizing voltage power supply are analyzed.theoretical derivation, qualitative analysis and simulation research, the results show that the strategy has a lower SPWM harmonic, less switch stress, and high frequency design is much easier to realize as well as the filter circuit design. In full-bridge high frequency inverter section, switch zero voltage turn-on is achieved by using both phase-shift control method and IGBT output capacitor and resonant inductor. Efficiency of the power supply is increased, and high frequency noise is restrained effectively.For the control system of the inverter, transient response become faster by adopting pole assignment dual close-loop PID feedback algorithm, thus the system static error is easier to eliminate. Simulation of the inverter system including phase-shift SPWM wave generation, power circuit system and feedback control system with MATLAB/SIMULINK software verified the feasibility of the strategy in theory, and gave a good guide in hardware and software design of the system.