Analysis of Solar Radiation Estimation under Shaded Sky Conditions using Experimental Measurements

Galarza J.; Condezo D.; Saenz B.; Orihuela M. · CIEES 2023 - IEEE International Conference on Communications, Information, Electronic and Energy Systems (2023) · DOI: 10.1109/ciees58940.2023.10378767

Resumen

Solar energy is a renewable energy source used in different applications that takes advantage of global and direct irradiance. In this context, the estimation of irradiance and its direct and diffuse components is essential for better energy use. In the present work, the Perrin Brichambaut approach was used to estimate the global irradiance; then, based on specific factors, the diffuse and direct irradiance were estimated. The factor for the diffuse component should be in the range of 1 to 1.5, while the factor for the direct component ought to be in the range of 0 to 1, considering that, with this approach, the normalized mean square error can be reduced up to 40% in comparison to other methods. The statistical evaluation for the proposed approach and the comparison with others has been carried out with more than 70 days of measurement in the 1-minute range through the pyranometer CMPIO Class A Kipp & Zonen installed in the city of Huancayo, Peru. The use of the proposed method allowed researchers to obtain an error rate of up to 2%. The factors for both irradiance components do not perform better if they present high variability during very cloudy sky conditions or intermittent sunny and cloudy conditions during the day. Rather, the factors should capture the irradiance variability as established in the present research.

Instituciones: Universidad Nacional del Centro del Perú