A discrete observer design for multicellular choppers

In this article, we introduce a discrete observer for a multicellular chopper with two branches. Multicellular choppers are a type of dynamical-switched systems that offer a higher performance compared to the classic chopper models. By using multiple commutation cells, the voltage is distributed over these cells; the cells reduce the stress on the components by reducing the value of dV/dt. This last property allows us to control each cell individually and reduce the cost of the components, especially in high power applications. The observer is tested in simulation with a direct control algorithm designed by the authors, using a 2 cells - 2 branches chopper with an RL load.