Resonant control for multi-cell cascaded H-Bridge topologies based on current source inverters

Abstract

Single-phase inverters have gained important acceptance last time. This is because single phase inverters have been used in renewable energy, ac drives and many other applications and controlled by name ways as linear, nonlinear predictive between others. This paper studied the control of a Single-Phase Current Source Inverter (SP-CSI) for multi-cell and three-phase applications. Cascaded H-Bridge (CHB-CSI) topology is formed by the stack of SP-CSI, with all advantages that CHB implies, as modularity and commutation noise reduction. However the control for single-phase systems cannot be achieved by Park Transformation if the current load or the current source are unbalanced. Therefore, this work proposed the Proportional Resonant Control (PRC) for the CHB based on CSIs, where the control study is formulated in continuous as well as discrete time. To complete this study a stability analysis is accomplished showing the feasibility of this control for CSI. Finally, simulation results are shown in order to corroborate the mathematical and theoretical analysis.