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• W2000779101 abstract "The intermittent nature of solar energy poses many challenges to renewable energy system operators in terms of operational planning and scheduling. Predicting the output of photovoltaic systems is therefore essential for managing the operation and assessing the economic performance of power systems. This paper presents a new technique for forecasting the 24-h ahead stochastic energy output of photovoltaic systems based on the daily weather forecasts. A comparison of the performances of the hybrid technique with conventional linear regression and artificial neural network models has also been reported. Initially, three single-stage models were designed, namely the generalized regression neural network, feedforward neural network and multiple linear regression. Subsequently, a hybrid-modeling approach was adopted by applying stepwise regression to select input variables of greater importance. These variables were then fed to the single-stage models resulting in three hybrid models. They were then validated by comparing the forecasts of the models with measured dataset from an operational photovoltaic system. The accuracy of the each model was evaluated based on the correlation coefficient, mean absolute error, mean bias error and root mean square error values. Simulation results revealed that the hybrid models perform better than their corresponding single-stage models. Stepwise regression-feedforward neural network hybrid model outperformed the other models with root mean square error, mean absolute error, mean bias error and correlation coefficient values of 2.74, 2.09, 0.01 and 0.932 respectively. The simplified network architecture of the hybrid schemes suggests that they are promising photovoltaic output prediction tools, particularly in locations where few meteorological parameters are monitored." @default.
• W2000779101 created "2016-06-24" @default.
• W2000779101 creator A5016953861 @default.
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• W2000779101 date "2015-05-01" @default.
• W2000779101 modified "2023-10-16" @default.
• W2000779101 title "A hybrid method for forecasting the energy output of photovoltaic systems" @default.
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• W2000779101 doi "https://doi.org/10.1016/j.enconman.2015.02.052" @default.
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