2019 Volume 8 Issue 3 Pages 394-403
This paper proposes a method for direct predictive control of DC-link current using the interior permanent magnet synchronous motor (IPMSM) discrete equation for electrolytic capacitorless inverters. Electrolytic capacitorless inverters do not have any electrolytic capacitors or power factor correction circuits. Therefore, direct DC-link current control is proposed as a method for controlling the the DC-link current of the inverter to improve the input power factor. However, in the direct DC-link current-control method, an error occurs in the DC-link current due to the one-sample delay in the voltage output. Because of this error, a current harmonic is generated in the input current. The direct predictive DC-link current control proposed in this paper reduces this error, thus satisfying the input-current-harmonics regulation value of IEC 61000-3-2.
