Efficiency Analysis of Predictive Current Control of a Multiphase Drive

In Finite Control Set Model Predictive Control for multiphase drives, weighting factors govern the relative priority among the multiple objectives included in the cost function. Although their influence on control performance, harmonic characteristics, and switching behavior has been extensively studied, their impact on energy efficiency remains largely unexplored. This paper addresses this gap through a comprehensive experimental assessment of the influence of cost function weighting factors on the energy efficiency of a five-phase induction motor drive. A dedicated laboratory test bench is used to evaluate drive efficiency across a broad range of operating conditions by systematically varying mechanical speed, load level and weighting factor combinations. The results reveal that cost function weighting factor tuning leads to efficiency variations of up to 7.6 percentage points depending on the operating regime. Furthermore, the study identifies an optimal parameter region that provides consistently high efficiency across the tested conditions.