A Power-Based Control Approach for a Battery-Assisted Quasi-Impedance-Source Converter Applied in Photovoltaic Systems

This work presents a power-based control technique for controlling the battery current in a quasi-impedance source converter (qZSC) topology. Such topology can integrate a photovoltaic (PV) array and a battery storage system (BSS) using a single inverter bridge. However, the control strategies for managing the energy stored in the battery for this topology are vulnerable to disturbances in the PV power, and have a high level of complexity, especially in terms of mathematical modeling. Therefore, the proposed control method aims to improve this functionality by implementing a cascade control based on the active power between the qZSC and the grid. Therefore, the dynamic model relating the battery current and the qZSC active power output will be demonstrated, as well as the respective closed-loop controller design. The simulation results demonstrate the effectiveness of the proposed modeling and control technique.