Predictive-Fixed Switching Current Control Strategy Applied to Six-Phase Induction Machine

• Main Authors: Osvaldo Gonzalez, Magno Ayala, Jesus Doval-Gandoy, Jorge Rodas, Raul Gregor, Marco Rivera
• Format: Article
• Language: English
• Published: MDPI AG 2019-06-01
• Series: Energies
• Subjects: multiphase induction machine; model predictive control; fixed switching frequency
• Online Access: https://www.mdpi.com/1996-1073/12/12/2294

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 (<inline-formula> <math display="inline"> <semantics> <mi>&#945;</mi> </semantics> </math> </inline-formula>-<inline-formula> <math display="inline"> <semantics> <mi>&#946;</mi> </semantics> </math> </inline-formula>) frame defined by space vector modulation in order to reduce the (<i>x</i>-<i>y</i>) 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.