Diseño de un algoritmo de gestión basado en lógica difusa para el intercambio de potencia entre microrredes eléctricas.

Abstract

This research work details the design of an energy management algorithm based on fuzzy logic that performs the exchange of power between two electrical microgrids (MG) interconnected between them to guarantee the provision of electrical energy supply. For the design of the energy management system (EMS), the use of the Fuzzy Logic Control (FLC) was selected due to the heuristic knowledge of the system, therefore, the FLC does not need to approximate the mathematical model of the system, nor does it need to linearize it. The microgrids under study are considered to be of a residential type connected to the grid and use the ERoC energy change rate and the state of charge of the battery (SOC) to increase-conserve-decrease the power consumed/delivered by the electrical network. To design the EMS, the power profiles of each microgrid are analyzed taking into account the excess power generated, for which three cases were proposed, testing the hypothesis: first case, MG1 provides maximum power (PM) of 187.50W to the MG2; In the second case, the MG2 provides the MG1 with a PM of 125.00W and in the latter case the power exchange is bidirectional, with the MG1 providing the MG2 with a PM of 62.50W and the MG2 providing the MG1 with a PM of 62, 40W. In the first two, the SOC oscillates at 75% (guaranteeing the useful life of the batteries), but not in the third scenario, therefore it will be necessary to include the SOC variable in the FLC to take control actions based on the state of a load of the energy storage systems of each microgrid. The validation of the designed strategies was carried out in Matlab®, evidencing the power exchanges, reducing fluctuations and power peaks, keeping the quality indices at acceptable levels.