Energy Reports (Nov 2023)
A simple fuzzy logic based DC link energy management system for hybrid industrial power supply
Abstract
Energy price hikes and the pollutant nature of fossil fuels have led energy producers to focus on the development of renewable energies. In the last few decades, the design of hybrid renewable energy systems presented itself as a difficult task because of its interference, uncertainty and especially unpredictable nature. However, scientific progress has enabled several solutions to be found to the problems associated with them. The aim of this article is to provide industries with satisfactory energy that respects the demand and supply balance with excellent energy quality, reduced losses and improved efficiency. To achieve these objectives, an energy management system based on fuzzy logic is proposed and applied to the hybrid photovoltaic hydroelectric system coupled to the DC link through electronic switches. The proposed method is based on the error in the output voltage at the AC link. On the basis of the error and its variations, 81 fuzzy rules are established and offer the advantage that they do not take in to account the mathematical model of the system. In addition, the proposed algorithm is seen at the DC link as a controlled current source which has the advantage of automatically compensating the power deficit required by the loads. Under the strong influence of non-linear loads, and in comparison with the Artificial Ant Colony (ACO) and Proportional Integral (PI) control techniques, simulation results in the Matlab/Simulink environment present satisfactory results for the proposed algorithm in terms of robustness to disturbances, good response and compensation speed, excellent energy balance and quality, with total harmonic distortion values well below the standards. Quantitatively, the proposed algorithm averagely improves the response speed of the system by 12.72%, the root-mean-square error by 31% and the total harmonic distortion by 30% as compared to the other two methods.