Computationally Efficient MPC for Modular Multilevel Matrix Converters Operating With Fixed Switching Frequency
Rodrigo H. Cuzmar, Andrés Mora, Javier Pereda, Ricardo P. Aguilera, Pablo Poblete, Sebastián Neira
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.