Design and Control of a Photovoltaic Distribution System Based on Modular Buck-Boost Converters

Abstract

The main contribution of this research is the design of a series hybrid topology for a photovoltaic distribution system using Buck-Boost converter modules. This design incorporates a maximum power point tracking (MPPT) algorithm based on the perturb and observe method, linear PI controllers, and an energy management algorithm. The controllers' design is validated through simulation using PSIM and SISOTOOL/MATLAB. This work aims to achieve active power-sharing in the AC grid through a control loop implemented with a three-phase inverter. The validation of the topology and controller design demonstrates tracking and robustness in four test scenarios for the state variables in microgrids: constant and variable irradiance conditions, auxiliary storage device (ASD) protection and control loops, and power-sharing with the AC grid, while considering the DC system dynamics.