Improved Model Predictive Current Control with Duty Cycle for Permanent Magnet Synchronous Motor Drives

Conventional model predictive control method uses one optimal voltage vector during a control period. It causes higher flux and torque ripples and harmonics. It also heavily relies on system parameters which no more remain constant with the passage of time due to changes in temperature. This paper proposes an improved version of finite control set model predictive current control method with duty cycle. Introduction of duty cycle allows the freedom to incorporate a zero voltage vector with optimal one for a calculated fraction of control period. In order to make model predictive control method independent of system parameters, emf estimation is introduced which takes into account voltage and current vectors from previous control intervals. Simulations have been carried out to verify the effectiveness of proposed methodology.