Key words: hybrid system, modeling, optimal sizing, simulation algorithm.

Abstract: This paper presents an optimal sizing method of an autonomous hybrid wind photovoltaic system. The main objective of this study is to determine the optimal characteristics of a system able to cover the energy demands of a consumer for a given specific location. This method is essentially based on two main phases. The modeling of the autonomous hybrid system is considered the first phase in the process of optimal sizing. The second phase is to optimize the dimensioning of the system based on the lack of energy to generate probability (LEGP), percentage of the surplus of energy produced (PSEP) and the cost of the kilowatt-hour produced (CkWh). From these two phases, a simulation code has been developed as a working tool able to perform the analysis and optimization of a hybrid system for given load and location. Therefore, a case study that uses this code was presented to determine the optimal configuration of a system that meets the energy requirements (5kWh/jour) of a house located in Sfax, Tunisia.