Fine current harmonics suppression control for the input current of electrolytic capacitor-less inverter for IPMSM

This paper proposes a current harmonics control method for the input current of an electrolytic capacitor-less inverter for an interior permanent magnet synchronous motor (IPMSM). In general, an IPMSM has large spatial harmonics caused by the rotor structure. The back electromotive force (EMF) of an IPMSM contains harmonics and generates three-phase current harmonics. The three-phase current harmonics result in the input current harmonics of an electrolytic capacitor-less inverter because the power converter system has little energy storage on the DC-link. This paper analyzes an input current harmonics generation mechanism based on averaged DC-link current. The proposed control method that controls the input current harmonics is based on the analysis mechanism. The validity of the proposed method is confirmed through simulation and experimental results.