Modeling and state-space feedback design of the battery current controller for the energy stored quasi-Z-source inverter

A battery-assisted qZSI features buck/boost characteristic by introducing shoot-through states. It makes full use of the fluctuant power, which generated from photovoltaic or fuel cell, by the energy-stored battery paralleled to the quasi-Z-source capacitor. Previous studies discussed the steady state performance and energy storage management for batteries. However, the dynamic tracking performance is not well studied. In this paper, a four-order model is proposed and the bandwidth limitation is analyzed by the maps of the closed-loop poles. A high bandwidth battery current controller is fulfilled then based on the state-space feedback technology. Finally, the simulation and experimental results validate the efficiency of the proposed control method.