Abstract: Since input filter is usually ignored in the modulation strategy for matrix converter, only the input current of converter is controlled in the same phase with grid voltage. Phase advance of grid current will come about as a result of current of capacitor and the power factor of grid side will be reduced. To solve this problem, the mathematical model of matrix converter was analyzed and the relationship between the real power factor and parameters of the system was studied. A grid current closed-loop control strategy was proposed. As the control objective of the strategy, the grid current was indirectly controlled by adjusting the input current of converter. In this way, the power factor of grid side was able to be controlled correctly. The effectiveness and feasibility of the new control method were confirmed by the simulation results, the power factor keeps high regardless of the system power.

Key words: matrix converter, input filter, current closed-loop, power facto