Voltage Transfer Characteristic Analysis of Dual-Bridge Matrix Converter

A lot of research has been made on space vector modulation (SVM) strategy of matrix converter (MC), but research on over modulation strategy of MC is almost blank. This paper analyzed conventional control theory of dual-bridge MC, derived voltage transmission characteristic, then presented an over modulation method. At first, the rectifier is over modulated to get the greatest DC voltage, then the inverter is modulated from linear region to six-step mode seamlessly, which effectively improve the voltage utilization. Voltage transfer ratio under different conditions is emphatically analyzed with Fourier transform. Finally, different modulation method is simulated with MATLAB. Both math analyses and simulation results verify that the over modulation strategy is very useful to improve voltage utilization, which provide a theoretical basis for further research.