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Unit Commitment in a Large-Scale Power System including Fuel Constrained Thermal and Pumped-Storage Hydro

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5 Author(s)
Aoki, K. ; Faculty of Engineering Hiroshima University Higashihiroshima, Japan ; Satoh, T. ; Itoh, M. ; Ichimori, T.
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This paper presents a new method for solving efficiently a large-scale optimal unit commitment problem. Our problem includes three types of units (i) usual thermal units, (ii) fuel constrained thermal units and (iii) pumped-storage hydro units. The solution method uses a Lagrangian relaxation. For maximizing the Lagrangian function, a 'variable metric method' is tried instead of the subgradient method. Moreover, a new device for efficiently obtaining a feasible solution is proposed. This leads to very good numerical results. All important operating constraints are incorporated.

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Power Systems, IEEE Transactions on  (Volume:2 ,  Issue: 4 )