This research paper investigates the feasibility of integrating photovoltaic batteries storage systems into a direct current (DC) microgrid for reliable electricity supply. The proposed system consists of a photovoltaic array, DC/DC boost converter, battery bank energy storage, bidirectional DC/DC converter and DC loads. First the elements of our system are modeled than the control of this elements is given.
A fuzzy logic-based control algorithm is used as a maximum power point tracking to optimize power extraction from the photovoltaic panels.The energy management system (EMS) operator regulates the power output of the photovoltaic array/battery bank by transmitting reference power signals to the input side regulation unit. These units, in turn, control the DC link voltage and the state of charge of the battery energy storage system. Depending on the energy management system proposed, our system works as an islanded microgrid and as a connected to an alternating current (AC) Grid.
The contribution of this paper is the use of fuzzy logic based MPPT this technique give better performance than the classical perturb and observe in terms of robustness, efficiency and response time.
The system is simulated using Matlab software; variable sunshine and temperature are taken to test the effectiveness of our system. The results simulation demonstrates the high performance of the fuzzy logic maximum power point tracking controller used and the effectiveness of the energy management system (EMS) proposed.