Virtual Voltage Vector-Based Model Predictive Current Control for Five-Phase VSIs With Common-Mode Voltage Reduction

Abstract

Model predictive current control (MPCC) schemes have been considered as a promising control technique for voltage source inverters (VSIs). However, the computational burden reduction, harmonic currents elimination, and common-mode voltage (CMV) mitigation are special issues when MPCC schemes are applied to five-phase VSIs. Moreover, it is time-consuming to tune weighting factors for the multiple control objectives. To address these problems, this article proposes two computationally efficient MPCC schemes based on virtual voltage vectors ( V <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> s), named MPCC-V <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> -RCMV1 and MPCC-V <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> -RCMV2. The former one achieves lower harmonics, whereas the latter one achieves lower switching frequency. The V <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> s are defined with basic voltage vectors that generate small CMV; hence, inherent CMV reduction can be achieved. The proposed MPCC schemes simplify the controller by redefining the cost function and control set, which reduces the computational effort significantly. Besides, the proposed MPCCs can improve the quality of current waveforms. Simulations and experiments are carried out to verify the effectiveness of the proposed control schemes.