Long-Term Generation Maintenance Scheduling with Integration of Pumped Storage Units

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In a power system, the reliable performance of generation units for the supply of demand has the great importance. The execution of maintenance in a timely manner has a great impact on forced outage rate of generation units and so has impacts on mitigation of generation costs. In restructured power systems, regard to the independence of generation companies, the procedure of maintenance planning has become more complicated compared with traditional power systems. This study presents an optimization problem, which seeks for a long-term maintenance scheduling method for power generation units subject to the reduction of maintenance and operation costs, retaining the system's reliability and satisfaction of prevailing constraints. A mathematical method based on Benders decomposition technique is proposed to arrange a maintenance schedule for generation units. A penalty factor corresponding to the peak load curve is defined and the lost profits of the units at the time of maintenance are also added to the objective function, to schedule maintenance proportional to the consumption patterns. In addition, by integrating the hydro pumped storage unit into the power system, the reliability of the system has been improved. IEEE-RTS 24-bus test system and GAMS software are used to show the effectiveness of the proposed method. The obtained results imply the accuracy, simplicity and great performance of the model.