Abstract: This paper presents a new control method for indirect matrix converter operating under unbalanced supply voltages. The proposed method aims to achieve balanced output voltages as well as a near unity input power factor operation. A Feed-Forward compensation method is used to get the balanced output voltage under unbalance supply voltages. A virtual dc - link voltage is generated by the use of voltage source rectifier then depending on the virtual dc - link voltage the modulation index of the inverter is adjusted to get the balanced desired magnitude output voltage. A proportional resonant controller is designed in dq reference frame to calculate the input power factor angle at the matrix converter input for the unity power factor operation of matrix converter system including the input current filter under unbalanced grid voltages. The effectiveness of control method to get the balanced output voltage and unity power factor operation of matrix converter system under unbalanced grid voltage, is verified through simulation study.
Index Terms: Active rectifier, matrix converters, power factor correction, resonant controllers, space vector modulation (SVPWM), unbalanced grid voltages.
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