DC-link RMS current reduction by increasing paralleled 3-phase inverter module number for segmented traction drive

摘要

This paper presents a 3-phase dc-link capacitor RMS current reduction method by increasing paralleled inverter module number for segmented traction drive. Compared with the existing 2-module paralleled system, this paper investigates increasing paralleled module number can further reduce the value of dc-link capacitor RMS current. The results show that 2 paralleled modules can reduce ∼45% and 3 paralleled modules with ∼55% reduction, 4 modules with ∼70% reduction, 5 modules with ∼75% reduction, 6 modules ∼80% reduction, respectively, with the proper interleaving scheme control. A series of PLECS simulation model are built to verify the proposed idea. Finally, 6 kW prototypes are developed with 3 modules. The experimental results are almost consistent with the simulation results.