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Hydro-wind Optimal Operation for Joint Biddingin Day-ahead Market: Storage Efficiency andImpact of Wind Forecasting Uncertainty

Cerejo da Silva, AJC ; Mariano, S.J.P.S. ; Carvalho, M. S. ; Calado, M.R.A.

journal of modern power systems and clean energy Vol. 8, Nº 1, pp. 142 - 149, January, 2020.

ISSN (print): 2196-5625
ISSN (online): 2196-5420

Journal Impact Factor: 2,848 (in 2019)

Digital Object Identifier: 10.35833/MPCE.2018.000689

Abstract
Wind power production is uncertain. The imbalance between committed and delivered energy in pool markets leads to the increase of system costs, which must be incurred by defaulting producers, thereby decreasing their revenues. To avoid this situation, wind producers can submit their bids together with hydro resources. Then the mismatches between the predicted and supplied wind power can be used by hydro producers, turbining or pumping such differences when convenient. This study formulates the problem of hydro-wind production optimization in operation contexts of pool market. The problem is solved for a simple three-reservoir cascade case to discuss optimization results. The results show a depreciation in optimal revenues from hydro power when wind forecasting is uncertain. The depreciation is caused by an asymmetry in optimal revenues from positive and negative wind power mismatches. The problem of neutralizing the effect of forecasting uncertainty is subsequently formulated and solved for the three-reservoir case. The results are discussed to conclude the impacts of uncertainty on joint bidding in pool market contexts.