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Predictive current control with modulation in asymmetrical six-phase motor drives

Predictive control has been introduced as an alternative to conventional controllers in the electrical torque and current regulation of multiphase drives. The increase in computing power of modern microprocessors makes this strategy now plausible, offering faster torque and current responses than PI controllers with carrier-based or space vector PWM techniques. However, the current control performance in the multiphase drives that use predictive controllers does not at present ensure good control and thus low values of harmonics. Modulation techniques have been recently combined with conventional predictive controllers to reduce the stator current harmonic components. In this paper, a novel predictive current control method that uses analytical modulation techniques is presented. The method is analyzed and reviewed in comparison with previous proposals, and simulation results are provided to verify its behavior.