# Ahead Half hour global solar radiation forecasting based on static and dynamic multivariable neural networks

### Abstract

The availability of precise global solar radiation (GSR) values in a given location is very essential for designing or supervising the solar energy systems (photovoltaic or thermal systems). In case of the rarity or the absence of these measurements, it is important to have a theoretical or empirical model to compute the GSR values. Therefore, our main goal in this work is to offer, to designer and engineers of solar energy systems, an appropriate and an accurate way to predict the half hour global solar radiation (HHGSR) characteristics from some available variables (relative humidity, air temperature, wind speed, precipitation, acquisition time vector in half hour scale). To predict the HHGSR, two intelligent models are developed. The first one is a multivariable dynamic neural network with feedback connection (M1) and the second one is a multivariable static neural network (M2). The database used to build these models, recorded in Agdal’s meteorological station in Marrakesh, Morocco, during 2013 and 2014 years, is divided in two subsets. The first subset is used for training and validating the models (phase I) and the second subset is used for testing the efficiency and the robustness of the models (phase II). The obtained results, in term of the statistical indicators: mean square error, root mean square error, mean absolute error and correlation coefficient, demonstrate that the developed models M1 and M2, are able to perform accurately the prediction of HHGSR in Marrakesh or others regions having similar climate.### References

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