Avaliação de estratégias para o controle de tensão na operação de microgrids em regime permanente

Abstract

The energy transition has already become a global reality. The methods of energy generation, transmission, and distribution have undergone significant changes in recent years, largely due to environmental, economic, and social policy issues. The main challenge of diversifying the energy matrix is to integrate different energy sources in a reliable and secure manner. Within this context, microgrids emerge as an opportunity in the electrical sector, as their main characteristic is to bring together various distributed resources into a single network. Based on this premise, this work aims to evaluate the behavior of a microgrid considering different operation configurations of power converter, such as PV, PQ, VSI, and Volt-Var modes, through power flow solution in polar coordinates by Newton-Raphson method. In addition to these evaluations, this study contributes to the implementation of a secondary voltage control together with the formulation of inverters with droop control system. Additionally, the value of the reference voltage to be configured by the inverter is obtained as a gain. The computational implementation was carried out in the Matlab software, and the 38-bus test system, widely mentioned in microgrid studies, was evaluated. For validation, the results of the proposed methodology were compared to those obtained from ANAREDE program, a extensively used software for steady-state network analysis, and the values were found to be similar, where it is possible to prove the accuracy and good performance of the implemented simulation.