Novel DC-link voltage variation method for interior permanent magnet synchronous motor drive system with high-efficient DC-DC converter

Predictive torque control of induction motor with integrated DC‐link voltage optimisation

“…Regardless of the used control strategy, torque, and current ripple reduction of IM or permanent magnet synchronous motors drive can be achieved by implementing DC‐link voltage optimisation [27–34]. Since IM represents an inductive load, it follows that lower DC‐link voltage will lead to the lower current, and, consequently, torque ripple.…”

“…However, this approach is possible only for control strategies utilising modulator. The authors of [29, 30, 32, 33] determine the optimal voltage from the measured or reference IM quantities and IM model parameters. The disadvantages are the open‐loop algorithm operation and the lack of robustness against parameter variation.…”

“…Another stage of prediction is added where the cost function evaluates the influence of the DC‐link voltage magnitude on the torque and flux ripple. Therefore, compared to [27–34], the DC‐link optimisation is a direct consequence of the torque and flux ripple minimisation. Also, the proposed method runs in a closed loop, which is more robust than the open‐loop solutions.…”