Multiphase Converter Voltage Optimization With Minimum Effort Principle

Multiphase converters are systems with multiple degrees of freedom (DOF) and provide space for control optimization. Widely spread space vector pulsewidth modulation methods offer competitive results. However, they are rather complicated due to high number of switching states and are designed for a specific $n$ -phase system or operation mode. For special cases, e.g., when total harmonic distortion should be reduced or fault-tolerant mode is required, they lead to complicated and specialized solutions. In this article, a minimum effort principle for leg-voltage optimization is proposed. This efficient approach is based on the minimum infinity norm solution and it effectively exploits the DOF. It is shown that the approach is universal and applicable to $n$ -phase systems and to both standard and fault-tolerant modes. Moreover, it enables to implement constraints on DOF and adjust trade-off between maximum output voltage and THD. To meet the requirements of real-time applications, an effective algorithm of low processing power is proposed.