Power-Based Control with Feed-forward Disturbance Rejection for Battery-Assisted Quasi-Impedance Source Converter in Photovoltaic Systems

This work presents an enhanced power-based control technique for controlling the battery current in a quasi-impedance source converter (qZSC) topology with a feed-forward control loop in order to improve disturbance rejection. Such topology can integrate a photovoltaic 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 photovoltaic 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 and control hardware-in-the-loop (C-HIL) results demonstrate the effectiveness of the proposed modeling and control technique.