A Simplified Predictive Current Control for Voltage Source Inverter

The usual major approaches for current control in hard switched inverters are ramp comparison, hysteresis control. The former involve PI controller and suffer from poor transient performance, and the latter requires complex analog circuitry to give a constant switching frequency. This paper presents a simplified predictive current control algorithms and its application to a voltage source inverter. Through on-line inductance and backemf estimation, the algorithms real-time adjust the inductance parameters and predictive the value of future backemf. Then the method uses predictive model to predictive the future value of the load current for all possible voltage vectors generated by the inverter. The voltage vector which minimizes a quality function is selected and applied to inverter in next control cycle. Simulation results of the proposed predictive current control have shown that the algorithms is effectively and has Excellent performance.