Simulation Research on Voltage Transfer Ratio for AC-AC Matrix Converters

A new kind of modulation strategy was put forward for the lower voltage transfer ratio of matrix converter. By means of the basic thought of indirect converting method for matrix converter, in virtual process of rectifying, the space vector modulation was adopted for input current; while in virtual process of inverting, the space vector over-modulation mode I was used for output voltage. Then the middle DC link was eliminated and the control strategy for AC-AC matrix converter was gotten. A careful analysis was mainly given to the output voltage space vector over-modulation. Further, a concrete control algorithm and the expression between voltage transfer ratio and modulation index were given, etc. The voltage transfer ratio of matrix converter can be raised to 0.91 by mathematical calculation. Finally, the model was set up in MATLAB language. Simulation experiments demonstrate that the new modulation strategy is feasible.