Development and Control of PMSM Drive With Improved Performance Over Wide Speed and Load Ranges

This project presents a dual-inverter fed permanent-magnet synchronous motor (PMSM) drive. First, the single-inverter fed drive is established with properly designed intelligent power module (IPM) based inverter schematic and control schemes. The dynamic modeling and systematic controller designs for current and speed control schemes are presented. Satisfactory dynamic and steady-state operating performances are verified experimentally. Next, the dual-inverter fed PMSM drive is constructed. The current sharing control and zero-sequence harmonic suppression approaches are proposed to yield improved performance. The robust current control is proposed to enhance the harmonic suppression response. Through the developed current robust error cancellation controller (CRECC), the robust and faster cancellation response is yielded. Finally, the motor drive efficiencies affected by power level, IPM type, inverter cell number, switching frequency, and DC-link voltage level are comparatively evaluated by measured results. Accordingly, the evenly high composite efficiencies over wide speed and load ranges are arranged.

Keywords: PMSM, efficiency, light load, varied voltage, dual inverter, current sharing, zero-sequence, harmonic suppression, robust control.