Abstract

Modular multilevel matrix converters stand out for their performance in ac-ac high-power conversion. However, they require multiple control loops to govern the currents from both ac ports, the internal circulating currents, and the capacitor voltages. This paper proposes a computationally efficient Model Predictive Control (MPC) strategy based on a new converter modeling to exploit the phase-shifted PWM working principle fully, achieving four improvements: i) control unification of both ac-ports currents, circulating currents, and capacitor voltages; ii) constrained optimization to safeguard the converter limits; iii) computational burden reduction and high scalability compared to standard MPC strategies; and iv) wide frequency operation with fast closed-loop transient responses, low harmonic distortion, and fixed switching frequency.