Impact of Clustering Methods on Machine Learning-based Solar Power Prediction Models

• Prediction of solar power generation is important in order to optimize energy exchanges in future micro-grids that integrate a large amount of photovoltaics. However, an accurate prediction is difficult due to the uncertainty of weather phenomena that impact produced power. In this paper, we evaluate the impact of different clustering methods on the forecast accuracy for predicting hourly ahead solar power when using machine learning based prediction approaches trained on weather and generated power features. In particular, we compare clustering methods using clearness index and K-means clustering, where we use both euclidian distance and dynamic time-warping. For evaluating prediction accuracy, we develop and compare different prediction models for each of the clusters using production data from a swedish SmartGrid. We demonstrate that proper tuning of thresholds for the clearness index improves prediction accuracy by 20.19% but results in worse performance than using K-means with all weather features as input to the clustering.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Keyword

Cluster analysis

Electric power transmission networks

K-means clustering

Solar energy

Solar energy conversion

Solar power generation

Weather forecasting

Clearness indices

Clustering methods

Clusterings

Machine-learning

Microgrid

Power

Prediction accuracy

Prediction modelling

Renewable energies

Smart grid

Smart power grids

Computer Science

Datavetenskap

Publication and Content Type

ref (subject category)

kon (subject category)