Journal
IET RENEWABLE POWER GENERATION
Volume 16, Issue 1, Pages 19-32Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/rpg2.12296
Keywords
energy yield; grid integration; machine learning; photovoltaic; solar forecasting
Categories
Funding
- European Regional Development Fund of the European Union [INTEGRATED/0918/0071]
- Research AMP
- Innovation Foundation of Cyprus
- ELECTRA project
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Accurate PV power forecasting is essential for integrating solar electricity efficiently. This study proposes a novel method for providing day-ahead aggregated PV production forecasts for distributed PV systems. By using clustering and up-scaling, the aggregated PV generation was successfully estimated.
Accurate photovoltaic (PV) power forecasting is an essential tool that enables the efficient integration of solar electricity and energy trading. This work proposes a novel methodology for the implementation of a forecasting tool that provides aggregated PV production day-ahead forecasts for the PV systems installed at a distribution level. Specifically, the tool is a cloud-based platform, comprising of a data quality block, a weather forecasting model, a machine learning power prediction step and an up-scaling aggregation stage. In this context and in the absence of a fully observable distribution system, the aggregated PV generation was estimated using a clustering approach and up-scaling the measured generation of reference systems to the aggregated installed capacity. The results demonstrated that the implemented tool exhibited high forecasting accuracies, lower than 10% given by the mean absolute percentage error when applied to the distribution system of Cyprus. Furthermore, the comparative benchmarking of the up-scaling techniques against the estimated aggregated PV generation demonstrated that the best-performing approach was the hybrid model, which provided a normalised root mean square error of 10.29% and mean absolute percentage error of 9.11%. Finally, useful information is provided for establishing a robust day-ahead forecasting methodology that is based on an optimal supervised learning and hybrid up-scaling approach.
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