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Electric Power Systems by João S. Catalão

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9.5    Solution Approach: Optimization Heuristics and Horizons

The unit commitment problem as formulated is a mixed-integer optimization problem. A practical solution of the minimization problems 9.10 through 9.18 will be pursued in this chapter by applying several simplifying assumptions, and breaking it into three subproblems, each with its own time horizon: annually, weekly, and a short-term operational time step (e.g., hourly). An annual horizon is used to realistically address unit outages and generate the initial availability indicator functions Ain(t) to reflect maintenance schedules and forced outages; a weekly horizon is used for the optimal scheduling of hydro and energy storage units; and a short-term horizon is used for the simulation ...

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