Research On Commutation Strategy Of Matrix Converter

Matrix Converter (MC), which has good prospect, is a novel power converter with high power density and high-quality input and output waveforms. There are many factors plagued the application of the MC, one of the main reasons is the commutation problems. The reliability of the commutation strategy, which is directly related to the security of the MC, is one of the key technical difficulties.Based on the foundation of detailed analysis on various commutation strategy, the voltage based commutation technology, which have better prospect, was investigated in this thesis. An improvement measures which called Novel Commutation Strategy was proposed for the commutation problem in the interval zone.The MC main circuit based on IGBT and the gate driver circuit based on EXB841 was constructed, the over-current protection was realized by adjust the threshold of the EXB841. The control circuit of MC based on DSP and CPLD was designed. The modulation strategy and commutation strategy were realized individually for modular design. The input voltage zone was reliably detected by the collaboration of hardware and software.The VHDL program for MC commutation based on the Novel Commutation Strategy was coded; the simulation results verified the commutation schedule. The basic semi-natural two-step commutation technology and the Novel Commutation Technology were compared based on experimental results. The experimental results verified the validity of the Novel Commutation Strategy.