Reduction of input current harmonics based on space vector modulation for three-level inverter with varied power factor

摘要

This paper presents a novel space vector modulation (SVM) which reduces current harmonics flowing through a DC-link capacitor of a three-level inverter employed for three-phase motor drive systems. In order to reduce the input current harmonics, the space vectors are selected to minimize the difference between the instantaneous value and the average value of the input current by using the magnitude relationships of the output currents. Furthermore, by determining the sector of the proposed SVM from these magnitude relations, the input current harmonics are reduced even when the load power factor changes. The experimental verification clarifies that the proposed SVM reduces the input current harmonics by 24.6% at the power factor of 0.866 and the modulation index of 0.7.