Closed loop PI control of PMSM for hybrid electric vehicle using three level diode clamped inverter for optimal efficiency

The development of electric and hybrid vehicles has gained increasing attention in recent years. This paper proposes an Electric drive for Hybrid vehicles application and its control strategy to achieve a wide speed range. In these vehicles, important requirements for the electric drive are low weight, small volume, high efficiency and low cost. When choosing the motor for the vehicle drive, the induction motor is an obvious alternative but a permanent magnet synchronous motor (PMSM) can offer advantages in terms of higher efficiency and specific power. In this paper a permanent magnet synchronous machine (PMSM) is used as an electric drive machine. The operation of a PMSM above the base speed is possible by weakening the permanent-magnet excitation by a demagnetizing field component supplied by the stator winding. This can be done by closed loop operation of PMSM. The speed and torque control of the PMSM drive used as hybrid vehicle is controlled by proper tuning the PI controllers. A three level diode clamped inverter using IGBT´s has simulated, whose switching sequences are controlled by Space Vector Pulse Width Modulation (SVPWM). A mathematical model of PMSM drive suitable for hybrid vehicle has simulated and proper closed loop control is established by field oriented control method. The entire work is done in MATLAB/SIMULINK.