Abstract
Various predictive torque control (PTC) strategies have been developed as powerful control schemes for the two-level B6 inverter fed induction motor (IM) drives. To achieve simultaneous control of the stator flux magnitude and the electromagnetic torque in conventional PTC scheme, the weighting factor for flux must be carefully adjusted as well as it has a great impact on the drive performance. Unfortunately, it is really a nontrivial process to obtain the optimized value of this weighting factor due to the lack of theoretical guideline. In order to cope with this problem, the predictive flux control (PFC) has been suggested based on removing the weighting factor from the implementation scheme. In addition to the conventional PFC (C-PFC), this paper proposes two bus-clamping PFC (BC-PFC) schemes where during each 60° sub-cycle, one stator phase is clamped to the positive or negative terminals of the dc-bus voltage. The performance of the three considered PFC strategies are evaluated based on several simulation results at transient and steady-state operations then by considering two comparison criteria, namely: (i) the average total harmonic distortion of the stator currents, and (ii) the average switching frequency.
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