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Fuzzy logic helped create a photovoltaic system that obeys the supply-and-demand principle and its delicate balance.

A new sizing system of a solar array and a battery in a standalone photovoltaic system based on fuzzy logic — a many-valued logic system designed to reason outputs by considering a range of possibilities rather than a simple, binary yes or no, as with classical logic – is in development from a group of researchers in Tunisia and Algeria.

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“The fuzzy logic system accepts the consumed energy and the monthly average of daily solar radiations as inputs and then outputs photovoltaic panel surfaces and the battery capacity,” said Chokri Ben Salah, a researcher in the Control and Energy Management Lab in the Department of Electrical Engineering at the National School of Engineers of Sfax, as well as an assistant professor at the Higher Institute of Applied Science and Technology of Sousse in Tunisia.

“Our method applies Matlab/Simulink interfaces, which aren’t complicated compared with other forms of simulation and model-based design,” said Ben Salah. In fact, it’s possible to build up a graphic integrated user interface to facilitate the usage of the proposed system. The group verified system performance with different inputs by simulations using calculated outputs.

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Their results demonstrated the effectiveness of this approach, Ben Salah said. For example, an expansion-planning model of photovoltaic panels and battery systems for a domestic “smart” house performed well in simulations.

The sizing photovoltaic/battery system provides the capacity of batteries used in the hybrid system and determines the surface of the PVP to end up used. Its primary significance is “characterized by its simplicity in the usage and its efficiency in optimizing the cost and losses,” they said.

In terms of applications, the system may find use in a number of areas, including domestic dwellings, public buildings and industrial electrical settings, as well as for agricultural water pumping in the field.

“An extension of the present system is possible — such as appending a wind or fuel cell energy source,” Ben Salah said. “Our system can also be improved by adding an electrolyzer system to permit it to convert lost photovoltaic solar energy into hydrogen that can be stored in a special tank and then be used elsewhere.”

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