Cyril Voyant

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Cyril Voyant is a French physicist and Research Director at Mines Paris–PSL University, within the Centre Observation, Impacts, Énergie (O.I.E.). His main research area is solar irradiance forecasting, including global horizontal irradiance forecasting, photovoltaic power forecasting, time-series modelling, machine learning for energy systems, and operational forecast evaluation. He also has established work in medical physics, especially radiotherapy dosimetry and radiobiological dose-equivalence modelling.

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solar irradiance forecasting solar radiation forecasting GHI forecasting PV power forecasting photovoltaic forecasting time-series forecasting AI for energy systems Extreme Learning Machine forecasting MIMO forecasting NICEk metrics forecast evaluation metrics renewable energy forecasting medical physics radiotherapy dosimetry LQ/LQL dose-equivalence models

Selected publications

• Voyant C., Julien A., Despotovic M., Notton G., Garcia-Gutierrez L.A., Nicolosi C.F., Blanc P., Bright J. Stochastic Coefficient of Variation: Assessing the Variability and Forecastability of Solar Irradiance. Renewable Energy, 256:123913, 2026. DOI: 10.1016/j.renene.2025.123913.
• Voyant C. A Tolerance-Based Framework for Spatio-Temporal Forecast Validation Using the gamma-Index. International Journal of Forecasting, 2026.
• Voyant C., Despotovic M., Garcia-Gutierrez L., Asloune M., Saint-Drenan Y.-M., Duchaud J.-L., Faggianelli G.A., Magliaro E. Short-Term Forecasting of Energy Production and Consumption Using Extreme Learning Machine: A Comprehensive MIMO based ELM Approach. Applied Energy, 2026.
• Voyant C., Despotovic M., Notton G., Saint-Drenan Y.-M., Asloune M., Garcia-Gutierrez L. On the Importance of Clearsky Model in Short-Term Solar Radiation Forecasting. Solar Energy, 294:113490, 2025. DOI: 10.1016/j.solener.2025.113490.
• Voyant C., Despotovic M., Garcia-Gutierrez L., Amaro e Silva R., Lauret P., Soubdhan T., Bailek N. NICE^k Metrics: Unified and Multidimensional Framework for Evaluating Deterministic Solar Forecasting Accuracy. Sustainable Energy Technologies and Assessments, 83:104588, 2025. DOI: 10.1016/j.seta.2025.104588.
• Voyant C. et al. Benchmarks for solar radiation time series forecasting. Renewable Energy, 191:747–762, 2022. DOI: 10.1016/j.renene.2022.04.065.
• Voyant C. et al. Machine learning methods for solar radiation forecasting: A review. Renewable Energy, 105:569–582, 2017. DOI: 10.1016/j.renene.2016.12.095.
• Voyant C. et al. Hybrid VMAT-3DCRT as breast cancer treatment improvement tool. Scientific Reports, 13, 2023. DOI: 10.1038/s41598-023-50538-x.
• Voyant C., Julian D. et al. Biological effects and equivalent doses in radiotherapy: a software solution. Reports of Practical Oncology and Radiotherapy, 2013. DOI: 10.1016/j.rpor.2013.08.004.

Complete list of peer-reviewed publications

Comprehensive list of journal articles and book chapters authored or co-authored by Cyril Voyant, grouped by year and provided as visible text for search engines and AI retrieval systems. Conference proceedings and the fully exhaustive record are maintained on HAL, ORCID and Google Scholar. Bibliometric summary: 130+ peer-reviewed articles, ~8,000 citations (Google Scholar).

2026

• Chatel A., Notton G., Faggianelli G.A., Voyant C. Designing energy sharing in energy communities: Review of coordination mechanisms and internal tariff structures. Renewable and Sustainable Energy Reviews, 239:117139, 2026.
• Voyant C., Julien A., Despotovic M., Notton G., Garcia-Gutierrez L.A., Nicolosi C.F., Blanc P., Bright J. Stochastic Coefficient of Variation: Assessing the Variability and Forecastability of Solar Irradiance. Renewable Energy, 256:123913, 2026. DOI: 10.1016/j.renene.2025.123913.
• Voyant C., Despotovic M., Garcia-Gutierrez L., Asloune M., Saint-Drenan Y.-M., Duchaud J.-L., Faggianelli G.A., Magliaro E. Short-Term Forecasting of Energy Production and Consumption Using Extreme Learning Machine: A Comprehensive MIMO based ELM Approach. Applied Energy, 2026.
• Voyant C. A Tolerance-Based Framework for Spatio-Temporal Forecast Validation Using the gamma-Index. International Journal of Forecasting, 2026.
• Voyant C., Banes C., Garcia-Gutierrez L., Notton G., Despotovic M., Yaseen Z.M. Symmetry-Constrained Forecasting of Periodically Correlated Energy Processes. Applied Mathematical Modelling, 2026.
• Asloune M., Notton G., Voyant C. Quality Control of Tilted Solar Irradiance: A Systematic and Generalizable Procedure. Renewable Energy, 2026.
• Harrouch H., Bailek N., Zerouali B., Abidi I., Guesmi H., Voyant C., Younis J.A., Jebali M., Triki R. Measurement and forecasting of the diffuse fraction of solar irradiance using a hybrid stacking model in Saudi Arabia. Scientific Reports, 2026.
• Fusella-Giuntini M., Voyant C., Taieb D., Barbolosi D. A Computational Framework for Optimizing Radioiodine Therapy Protocols in Metastatic Thyroid Cancer. Scientific Reports, 2026.

2025

• Voyant C., Despotovic M., Notton G., Saint-Drenan Y.-M., Asloune M., Garcia-Gutierrez L. On the Importance of Clearsky Model in Short-Term Solar Radiation Forecasting. Solar Energy, 294:113490, 2025. DOI: 10.1016/j.solener.2025.113490.
• Voyant C., Despotovic M., Garcia-Gutierrez L., Amaro e Silva R., Lauret P., Soubdhan T., Bailek N. NICE^k Metrics: Unified and Multidimensional Framework for Evaluating Deterministic Solar Forecasting Accuracy. Sustainable Energy Technologies and Assessments, 83:104588, 2025. DOI: 10.1016/j.seta.2025.104588.
• Lauret P., David M., Le Gal La Salle J., Lorenz E., Perez R., Voyant C. A Simple Method for Quickly Estimating Solar Irradiance Forecast Errors. Solar Energy, 301:113821, 2025.
• Asloune M., Notton G., Voyant C. From Trends to Insights: A Text Mining Analysis of Solar Energy Forecasting (2017–2023). Energies, 18(19):5231, 2025.
• Benkaciali S., Notton G., Voyant C. Comparative Study of Feature Selection Techniques for Machine Learning-Based Solar Irradiation Forecasting: Application to Algerian Climatic Conditions. Sustainability, 17:6400, 2025.
• Despotovic M., Notton G., Voyant C. Transfer Learning for Wind Speed Forecasting: A Scalable Approach for Data-Scarce Environments. International Journal of Green Energy, 2025.
• Voyant C., Julian D., Muraro S., Bodez V., Pinpin M., Leschi D., Oozeer R., Wided G., Acquaviva M.-A., Prapant S., Gahbiche O., Bouaouina N. Improving Clinical Decision-Making in Radiotherapy: A Comparative Analysis of LQ and LQL Dose Models. Clinical Oncology, 2025.
• Fusella Giuntini M., Voyant C., Taieb D., Barbolosi D. Computational Modeling and Trends in RAI Therapy for Thyroid Cancer: A Field with Clinical Promise. Biomedical Journal of Scientific & Technical Research, 62(4), 2025.
• Fusella Giuntini M., Voyant C., Taieb D., Barbolosi D. A Mechanistic Dynamic Surrogate Framework for Personalized Radioactive Iodine Therapy in Metastatic Thyroid Cancer. Precision Oncology, 1(2), 2025.

2024

• Despotovic M., Voyant C., Garcia-Gutierrez L., Almorox J., Notton G. Solar irradiance time series forecasting using auto-regressive and extreme learning methods: Influence of transfer learning and clustering. Applied Energy, 365:123215, 2024.
• Notton G., Ouédraogo S., Faggianelli G.A., Voyant C., Duchaud J.-L. Profitability and performance improvement of smart photovoltaic/energy storage microgrid by integration of solar production forecasting tool. Intelligent Learning Approaches for Renewable and Sustainable Energy (book chapter), 73–102, 2024.

2023

• Voyant C., Pinpin M., Leschi D., Prapant S., Savigny F., Acquaviva M.-A. Hybrid VMAT-3DCRT as Breast Cancer Treatment Improvement Tool. Scientific Reports, 13, 2023. DOI: 10.1038/s41598-023-50538-x.

2022

• Voyant C., Notton G., Duchaud J.-L., Garcia-Gutierrez L.A., Bright J.M., Yang D. Benchmarks for Solar Radiation Time Series Forecasting. Renewable Energy, 191:747–762, 2022. DOI: 10.1016/j.renene.2022.04.065.
• Voyant C., Lauret P., Notton G., Duchaud J.-L., Garcia-Gutierrez L., Faggianelli G.A. Complex-Valued Time Series Based Solar Irradiance Forecast. Journal of Renewable and Sustainable Energy, 14(6):066502, 2022. DOI: 10.1063/5.0128131.
• Garcia-Gutierrez L., Voyant C., Notton G., Almorox J. Evaluation and Comparison of Spatial Clustering for Solar Irradiance Time Series. Applied Sciences, 12(17):8529, 2022.
• Ouédraogo S., Faggianelli G.A., Notton G., Duchaud J.-L., Voyant C. Impact of electricity tariffs and energy management strategies on PV/Battery microgrid performances. Renewable Energy, 199:816–825, 2022.
• Duchaud J.-L., Faggianelli G.A., Voyant C., Notton G. Effect of the meta parameters on a model predictive algorithm for renewable micro-grid optimal control. Sustainable Energy Technologies and Assessments, 54:102886, 2022.
• Gairaa K., Voyant C., Notton G., Benkaciali S., Guermoui M. Contribution of ordinal variables to short-term global solar irradiation forecasting for sites with low variabilities. Renewable Energy, 2022.

2021

• Almorox J., Voyant C., Bailek N., Kuriqi A., Arnaldo J.A. Total solar irradiance's effect on the performance of empirical models for estimating global solar radiation: An empirical-based review. Energy, 236:121486, 2021.
• David M., Boland J., Cirocco L., Lauret P., Voyant C. Value of deterministic day-ahead forecasts of PV generation in PV + Storage operation for the Australian electricity market. Solar Energy, 224:672–684, 2021.
• Voyant C., Lauret P., Notton G., Duchaud J.-L., Fouilloy A., David M. A Monte Carlo based solar radiation forecastability estimation. Journal of Renewable and Sustainable Energy, 13(2):026501, 2021.
• Voyant C., Notton G., Duchaud J.-L., Almorox J., Yaseen Z.M. Solar irradiation prediction intervals based on Box–Cox transformation and univariate representation of periodic autoregressive model. Renewable Energy Focus, 33:43–53, 2021.

2020

• Yang D., Alessandrini S., Antonanzas J., …, Voyant C., Zhang J. Verification of deterministic solar forecasts. Solar Energy, 2020.
• Tao H., Salih S.Q., Saggi M.K., Dodangeh E., Voyant C., Al-Ansari N., Yaseen Z.M., Shahid S. A Newly Developed Integrative Bio-Inspired Artificial Intelligence Model for Wind Speed Prediction. IEEE Access, 8:83347–83358, 2020.
• Tao H., Ewees A.A., Al-Sulttani A.O., Beyaztas U., Hameed M.M., Salih S.Q., Armanuos A.M., Al-Ansari N., Voyant C., Shahid S., Yaseen Z.M. Global solar radiation prediction over North Dakota using air temperature: Development of novel hybrid intelligence model. Energy Reports, 7:136–157, 2020.
• Duchaud J.-L., Voyant C., Fouilloy A., Notton G., Nivet M.-L. Trade-Off between Precision and Resolution of a Solar Power Forecasting Algorithm for Micro-Grid Optimal Control. Energies, 13(14):3565, 2020.
• Benkaciali S., Notton G., Voyant C., Gairaa K. Performance study of broadband models for clear sky conditions: case of southern Algeria. Journal of Renewable Energies, 23:236–258, 2020.

2019

• Duchaud J.-L., Notton G., Fouilloy A., Voyant C. Hybrid renewable power plant sizing — Graphical decision tool, sensitivity analysis and applications in Ajaccio and Tilos. Applied Energy, 254:113601, 2019.
• Notton G., Duchaud J.-L., Nivet M.-L., Voyant C., Chalvatzis K., Fouilloy A. The electrical energy situation of French islands and focus on the Corsican situation. Renewable Energy, 135:1157–1165, 2019.
• Benali L., Notton G., Fouilloy A., Voyant C., Dizene R. Solar Radiation Forecasting using Artificial Neural Network and Random Forest Methods. Renewable Energy, 132:871–884, 2019.
• Duchaud J.-L., Notton G., Darras C., Voyant C. Multi-Objective Particle Swarm Optimal Sizing of a Renewable Hybrid Power Plant with Storage. Renewable Energy, 131:1156–1167, 2019.
• Tao H., Ebtehaj I., Bonakdari H., Heddam S., Voyant C., Al-Ansari N., Deo R., Yaseen Z.M. Designing a New Data Intelligence Model for Global Solar Radiation Prediction. Energies, 2019.
• Notton G., Voyant C., Fouilloy A., Duchaud J.-L. Some Applications of ANN to Solar Radiation Estimation and Forecasting for Energy Applications. Applied Sciences, 9(209), 2019.

2018

• Voyant C., De Gooijer J., Notton G. Periodic Autoregressive Forecasting of Global Solar Irradiation Without Knowledge-based Model Implementation. Solar Energy, 174:121–129, 2018.
• Voyant C., Motte F., Notton G., Fouilloy A., Nivet M.-L., Duchaud J.-L. Prediction intervals for global solar irradiation forecasting using regression trees methods. Renewable Energy, 126:332–340, 2018.
• Fliess M., Join C., Voyant C. Prediction bands for solar energy: New short-term time series forecasting techniques. Solar Energy, 166:519–528, 2018.
• Notton G., Nivet M.-L., Voyant C., Darras C., Motte F., Paoli C. Intermittent and stochastic character of renewable energy sources: consequences, cost of intermittence and benefit of forecasting. Renewable & Sustainable Energy Reviews, 87:96–105, 2018.
• Voyant C., Notton G. Solar irradiation nowcasting by stochastic persistence: a new parsimonious, simple and efficient forecasting tool. Renewable & Sustainable Energy Reviews, 2018.
• Duchaud J.-L., Notton G., Darras C., Voyant C. Power ramp-rate control algorithm with optimal State of Charge reference via Dynamic Programming. Energy, 149:709–717, 2018.
• Fouilloy A., Voyant C., Motte F., Notton G., Paoli C., Nivet M.-L., Guillot E. Solar irradiation forecasting with machine learning and computational methods for 3 weather variabilities. Renewable Energy, 2018.

2017

• Voyant C., Notton G., Kalogirou S., Nivet M.-L., Paoli C., Motte F., Fouilloy A. Machine learning methods for solar radiation forecasting: A review. Renewable Energy, 105:569–582, 2017. DOI: 10.1016/j.renene.2016.12.095.
• Voyant C., Notton G., Paoli C., Fouilloy A., Motte F., Darras C. Uncertainties in global radiation time series forecasting using machine learning: The multilayer perceptron case. Energy, 125:248–257, 2017.
• Voyant C., Motte F., Fouilloy A., Notton G., Paoli C., Nivet M.-L. Forecasting method for global radiation time series without training phase. Energy, 120:199–208, 2017.
• Voyant C., Paoli C., Notton G., Nivet M.-L., Fouilloy A., Motte F. Multi-layer Perceptron and Pruning. Turkish Journal of Forecasting, 1(1):1–6, 2017.
• Voyant C., Julian D. A Short Synthesis Concerning Biological Effects and Equivalent Doses in radiotherapy. Journal of Radiology and Oncology, 39–45, 2017.

2010–2016

• Dahmani K., Notton G., Voyant C., Dizene R., Nivet M.-L., Paoli C., Tamas W. Multilayer Perceptron approach for estimating 5-min and hourly horizontal global irradiation from exogenous meteorological data in locations without solar measurements. Renewable Energy, 90:267–282, 2016.
• Voyant C., Soubdhan T., Lauret P., David M., Muselli M. Statistical parameters as a means to a priori assess the accuracy of solar forecasting models. Energy, 90:671–679, 2015.
• Lauret P., Voyant C., Soubdhan T., David M., Poggi P. A benchmarking of machine learning techniques for solar radiation forecasting in an insular context. Solar Energy, 2015.
• Tamas W., Notton G., Paoli C., Nivet M.-L., Voyant C. Hybridization of Air Quality Forecasting Models Using Machine Learning and Clustering. Aerosol and Air Quality Research, 2015.
• Voyant C., Randimbivololona P., Nivet M.-L., Paoli C., Muselli M. Twenty four hours ahead global irradiation forecasting using multi-layer perceptron. Meteorological Applications, 21(3):644–655, 2014.
• Voyant C., Haurant P., Muselli M., Paoli C., Nivet M.-L. Time series modeling and large scale global solar radiation forecasting from geostationary satellites data. Solar Energy, 102:131–142, 2014.
• Dahmani K., Dizene R., Notton G., Paoli C., Voyant C., Nivet M.-L. Estimation of 5-min time-step data of tilted solar global irradiation using ANN model. Energy, 70:374–381, 2014.
• Voyant C., Darras C., Muselli M., Paoli C., Nivet M.-L., Poggi P. Bayesian rules and stochastic models for high accuracy prediction of solar radiation. Applied Energy, 2014.
• Voyant C., Paoli C., Muselli M., Nivet M.-L. Multi-horizon solar radiation forecasting for Mediterranean locations using time series models. Renewable and Sustainable Energy Reviews, 28:44–52, 2013.
• Voyant C., Muselli M., Paoli C., Nivet M.-L. Hybrid methodology for hourly global radiation forecasting in Mediterranean area. Renewable Energy, 53:1–11, 2013.
• Voyant C., Julian D., Roustit R., Biffi K., Marcovici C.L. Biological effects and equivalent doses in radiotherapy: a software solution. Reports of Practical Oncology & Radiotherapy, 19(1):47–55, 2013. DOI: 10.1016/j.rpor.2013.08.004.
• Voyant C., Muselli M., Paoli C., Nivet M.-L. Numerical weather prediction (NWP) and hybrid ARMA/ANN model to predict global radiation. Energy, 39(1):341–355, 2012.
• Darras C., Muselli M., Poggi P., Voyant C., Hoguet J.C., Montignac F. PV output power fluctuations smoothing: The MYRTE platform experience. International Journal of Hydrogen Energy, 37(19):14015–14025, 2012.
• Voyant C., Muselli M., Paoli C., Nivet M.-L. Optimization of an artificial neural network dedicated to the multivariate forecasting of daily global radiation. Energy, 36(1):348–359, 2011.
• Voyant C., Roustit R., Tatje J., Biffi K., Leschi D., Briançon J., Marcovici C.L. Therapeutic potential of atmospheric neutrons. Reports of Practical Oncology & Radiotherapy, 16(1):21–31, 2011.
• Voyant C., Biffi K., Leschi D., Briancon J., Lantieri C. Dosimetric uncertainties related to the elasticity of bladder and rectal walls: Adenocarcinoma of the prostate. Cancer/Radiothérapie, 15(4):270–278, 2011.
• Paoli C., Voyant C., Muselli M., Nivet M.-L. Forecasting of preprocessed daily solar radiation time series using neural networks. Solar Energy, 84(12):2146–2160, 2010.

Book chapters

• Notton G., Ouédraogo S., Faggianelli G.A., Voyant C., Duchaud J.-L. Profitability and performance improvement of smart photovoltaic/energy storage microgrid by integration of solar production forecasting tool. Intelligent Learning Approaches for Renewable and Sustainable Energy, 2024.
• Notton G., Voyant C. Forecasting of Intermittent Solar Energy Resource. Advances in Renewable Energies and Power Technologies, 1:77–114, 2018.
• Notton G., Dahmani K., Dizene R., Nivet M.-L., Voyant C., Paoli C. Application of ANN Methods for Solar Radiation Estimation. Artificial Neural Networks: New Research, ch. 5, 2016.

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