An Inverter Input Current Closed-loop Control Scheme for IPMSM Drives Fed by Electrolytic Capacitorless Converter

Single-phase to three-phase electrolytic capacitorless converter system has become a hot research topic in the field of air conditioners, owing to the merits of higher stability, higher power factor and lower cost. However, the control becomes complicated due to the oscillation in the dc link voltage. Various control methods have been proposed in the literature to improve the performance. In this paper, an inverter input current closed-loop control method is proposed to reduce the input current harmonics. The proposed method is compared with conventional method and the experimental results confirm its effectiveness.