Predictive control of DC-link current based on IPMSM discrete equation in electrolytic capacitor-less inverter

In this paper, the predictive control of DC-link current based on the IPMSM discrete equation for electrolytic capacitor-less inverter is proposed. In electrolytic capacitor-less inverters, electrolytic capacitor and power factor correction circuit are not used. Therefore, it is necessary to maintain both the input power factor and the motor control by controlling the inverter. Instantaneous voltage control has been proposed as a control method to achieve both motor control and input power factor improvement. In the instantaneous voltage control method, the DC-link current driving the motor is controlled. However, control error occurs in the DC-link current due to the sampling error in the motor current. Due to this control error, a resonance current is generated in the inductance and the DC-link capacitor. The predictive control of DC-link current proposed in this paper reduces this control error. The effectiveness of the proposed method is confirmed through simulation.