Abstract
This paper describes a strategy for control of the input current of a matrix converter with a generator as the input. The line impedance is larger than the power grid when the generator is used as the input of the matrix converter. The resonance between the synchronous reactance of the generator and the input capacitance results in unstable behavior of the matrix converter. For a stable operation, stability control is provided to the rotating frame on the generator side. With the proposed method, both generator current and output voltage can be controlled, regardless of the generator speed. In addition, optimal input power factor control is proposed for achieving the maximum modulation index of the matrix converter.
This study confirms the validity of the proposed control strategy on the basis of the results of simulations and experiments. Oscillations in the generator terminal voltage and current can be suppressed by using the proposed stability control. Moreover, the proposed control helps achieve stable operations at a motor load of 1.5kW, and the THD of the input current is reduced to 3.7%.
