A novel hysteresis band current controller scheme for three phase AC chopper

This paper presents the application of the hysteresis band current controller (HBCC) technique to the three phase pulse width modulation (PWM) AC chopper used for the purpose of controlling the magnitude of the sinusoidal currents and voltages applied to an AC load. If the HBCC technique used in the inverters is directly employed in the three phase PWM AC chopper, it causes the AC chopper to fail to provide balanced three phase sinusoidal currents for a three phase AC load. In return, this situation leads some unavoidable and serious faults to occur in the hardware of the three phase PWM AC chopper. In respect to this case, the detailed analysis expressing the related faults is presented. Consequently, for the first time, a novel HBCC technique overcoming these faults is proposed for the three phase PWM AC chopper. The proposed method is tested under various operating conditions and a very precise control performance is achieved. Simulation results prove the feasibility and validity of the proposed method.

► This paper purposes a new hysteresis band current controller (HBCC) for three phase AC chopper.
► The HBCC used in the inverter and its direct application to the AC chopper are analyzed.
► The continuity of three phase load currents is not ensured in all operating modes when it is used in the AC chopper.
► A novel HBCC for the AC chopper is proposed to ensure the continuity of three phase load current.
► The proposed method is tested under various operating points.
► A very precise current control performance is achieved.