Avaliação de técnicas de controle robusto em microredes de corrente contínua considerando incertezas politópicas

Abstract

Direct current (DC) microgrids have emerged as a promising alternative for electricity supply in isolated or hard-to-reach regions, due to their ability to operate autonomously and their ease of integration with renewable energy sources, such as photovoltaic systems and storage systems like batery. In this context, power converters plays a fundamental role, as they are responsible for regulating the DC bus voltage, ensuring system stability, and enabling efficient energy sharing, even in the presence of load variability and the intermittency of renewable sources. This work presents a comparative evaluation of robust control techniques applied to an isolated DC microgrid architecture, with the objective of ensuring system stability, efficiency, and operational reliability. Different control strategies are investigated, including pole placement, Linear Quadratic Regulator (LQR) control, and Linear Parameter-Varying (LPV) model-based control, considering system operation under parametric uncertainties. Performance analysis is carried out based on experimental results obtained from the practical implementation of the controllers in a real DC microgrid, allowing an objective assessment of the system’s dynamic behavior and highlighting the advantages and limitations of each investigated control strategy.