Skill forecasting from ensemble predictions of wind power

Pierre Pinson, Henrik Aalborg Nielsen, Henrik Madsen, G. Kariniotakis

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    Abstract

    Optimal management and trading of wind generation calls for the providing of uncertainty estimates along with the commonly provided short-term wind power point predictions. Alternative approaches for the use of probabilistic forecasting are introduced. More precisely, focus is given to prediction risk indices aiming to give a comprehensive signal on the expected level of forecast uncertainty. Ensemble predictions of wind generation are used as input. A proposal for the definition of prediction risk indices is given. Such skill forecasts are based on the spread of ensemble forecasts (i.e. a set of alternative scenarios for the coming period) for a single prediction horizon or over a took-ahead period. It is shown on the test case of a Danish offshore wind farm how these prediction risk indices may be related to several levels of forecast uncertainty (and potential energy imbalances). Wind power ensemble predictions are derived from the conversion of ECMWF and NCEP ensemble forecasts of meteorological variables to wind power ensemble forecasts, as well as by a lagged average approach alternative. The ability of prediction risk indices calculated from the various types of ensembles forecasts to resolve among situations with different levels of uncertainty is discussed.
    Original languageEnglish
    JournalApplied Energy
    Volume86
    Issue number7-8
    Pages (from-to)1326-1334
    ISSN0306-2619
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Uncertainty
    • Wind power
    • Ensemble forecasting
    • Prediction risk indices
    • Forecasting
    • Skill forecasting

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