Abstract
In applications such as multiphase motor drives, classical predictive control strategies are characterized by a variable switching frequency which adds high harmonic content and ripple in the stator currents. This paper proposes a model predictive current control adding a modulation stage based on a switching pattern with the aim of generating a fixed switching frequency. Hence, the proposed controller takes into account the prediction of the two adjacent active vectors and null vector in the ( α - β ) frame defined by space vector modulation in order to reduce the (x-y) currents according to a defined cost function at each sampling period. Both simulation and experimental tests for a six-phase induction motor drive are provided and compared to the classical predictive control to validate the feasibility of the proposed control strategy.
Highlights
In recent years, multiphase induction machines (IMs) have been considered to be such a viable alternative in comparison to three-phase machines due to their fault tolerance capabilities with no extra hardware, lower torque ripple and better power splitter per phase which result very attractive to the research community for various industrial applications where a high-performance control strategy, as well as, reliability are required [1]
The strategy is based on a modulation concept employed with the model predictive control (MPC) scheme, which has been studied for different power converters such as the mentioned two-level six-phase voltage source inverter (VSI) described in [15,16] and other topologies presented in [17,18]
A predictive current control technique with a fixed switching frequency applied to a six-phase IM has been proposed
Summary
Multiphase induction machines (IMs) have been considered to be such a viable alternative in comparison to three-phase machines due to their fault tolerance capabilities with no extra hardware, lower torque ripple and better power splitter per phase which result very attractive to the research community for various industrial applications where a high-performance control strategy, as well as, reliability are required [1]. The classic MPC strategy presents some limitations regarding to the application of only one vector in the whole sampling period This results in current ripples as well as large voltages at low sampling frequency. The variable switching frequency develops a spread spectrum, decreasing the performance of the system in terms of useful power [14] To overcome this subject, a predictive-fixed switching current control strategy, named (PFSCCS). The strategy is based on a modulation concept employed with the MPC scheme, which has been studied for different power converters such as the mentioned two-level six-phase VSI described in [15,16] and other topologies presented in [17,18].
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