Ultra-fast Decentralized Self-Aligned Carrier Principle for Multiphase/Multilevel Converters

This paper proposes an ultrafast decentralized self-aligned carrier principle for a multilevel or multiphase converter using phase-shifted (PS) or level-shifted (LS) carriers PWM method. Each cell of the converter synchronizes and updates simultaneously its own carrier angle or level based on the information share with its neighboring cell. As opposed to the classical decentralized control method based on the calculations of carrier angle with an iteration process and applied to PS-PWM, the proposed ultra-fast decentralized self-aligned carrier principle offers an instantaneous alignment for both PS and LS carriers. The simulation results show the effectiveness of the proposed method especially in the case of dynamic reconfiguration of the system including a large number of switching-cells.