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Three-Phase Inverter Control for AC Motor Drives with Small DC-Link Capacitor Fed by Single-Phase Diode Rectifier

This paper proposes a power controller used for three-phase inverter with small dc-link capacitors fed by a single-phase diode rectifier. The power flow of the three-phase inverter fed by the single-phase diode rectifier is analyzed. A direct active/reactive (P-Q) power controller (DPQC) is designed in discrete time instead of adopting a classical PI-type current regulator. The proposed structure can be applicable to three-phase inverters for a broad family of ac motors, such as induction and permanent magnet synchronous motors.