Abstract
Multiphase machines offer some interesting features to develop more-competitive electric drives. However, the control complexity increases due to the higher number of freedom degrees. Specifically, the regulation of secondary currents becomes critical to avoid an unacceptable harmonic distortion of phase currents. In this regard, standard finite-control-set model predictive control (FCS-MPC) is characterized by a limited capability to provide a suitable current quality, since a single switching state is applied per control cycle. In order to reduce the current harmonic content and retain the well-known FCS-MPC advantages, the use of a multi-vector approach has been recently explored in the field of multiphase electric drives. Following this trend, this work develops a simplified FCS-MPC version with a new generation of virtual voltage vectors (VV) that are used as control actions. The switching states that form the proposed VV provide null average $x-y$ voltages and reduced instantaneous injection of these secondary components. The capability of the suggested VV-based FCS-MPC strategy to mitigate the $x$ – $y$ injection is experimentally tested and compared to field-oriented control (FOC) using carrier-based pulse width modulation (CB-PWM) and diverse FCS-MPC schemes.
Highlights
M ULTIPHASE electric drives have allowed the implementation of novel operating modes for industrial applications [1,2]
The multiphase electric drive consists of a six-phase induction machine connected to a two-level dual three-phase voltage source converter (Semikron SKS22F) supplied by a single dc-link
Even though finite-control-set model predictive control (FCS-MPC) schemes have been considered an interesting alternative to regulate multiphase machines, their capability to compete with field-oriented control (FOC) strategies has been questioned because standard predictive approaches show a limited capability to achieve a low harmonic distortion
Summary
M ULTIPHASE electric drives have allowed the implementation of novel operating modes for industrial applications [1,2]. The x−y production can be reduced if the LVVs are combined with a null voltage vector in each sampling period, the cancellation of the average x − y voltages cannot be fully achieved [17,18] Taking these facts as a basis, this work develops a FCS-MPC that employs control actions characterized by a null average x−y voltage, where the applied switching states minimize the instantaneous x − y injection according to the operating point. While the features that have popularized model predictive control in the field of electric drives are retained [20], the proposed MV4-MPC provides a current quality that is in the same range as in FOC with CB-PWM and better than in previous multi-vector FCS-MPC versions.
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