Performance Analysis of Multi-Level Diode-Clamped Inverter fed IPMSM Drive for Electric Vehicles

The objective of this paper is to investigate the performance characteristics of Interior Permanent Magnet Synchronous Motor (IPMSM) which is fed by two, three and five-level diode clamped inverters using different modulation techniques and control methods which can be used for Electric Vehicles. Carrier Based Space Vector Modulation which can be digitally implemented for N-levels is proposed. This modulation is similar to Space Vector Modulation with less complexity avoiding the sector identification. This modulation technique is compared to validate its simplicity, robustness and good dynamic response with existing Sine Pulse Width and SVPWM techniques. Closed loop control is carried out with Field Oriented Control (FOC) and Direct Torque Control (DTC). To support the simulation analysis, a prototype of three-level diode-clamped inverter is implemented and the output is fed to 3-phase, 4-pole, and 400 V, 50 Hz, 0.45kW, 1500 RPM, IPMSM. Control logic is designed using DSP TMS320f28335 controller. The results obtained are quite suitable for electric vehicle applications, which give smooth operation with stronger acceleration and less maintenance.