Evaluation the Effects of Hydroelectric Generation Units’ Start-Up and Shut-Down Cost on Hydro-Thermal Generation Scheduling Problem

Document Type : Original Article

Author

Department of Electrical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Abstract

One of the most important issues affects the generation scheduling problem is consideration of start-up and shut-down costs of generation units. The amount of consumed fuel by a thermal unit from starting up until synchronization with power grid has been considered as the start-up cost. However, for a hydroelectric generating unit, the start-up and shut-down costs have been neglected. Meanwhile, the degradation of equipment due to frequent start-up and shut-down actions for such units are considerable. In this paper, a fair methodology for estimation of these costs is provided and the effects of implementing these costs in the generation scheduling problem are studied by implementing a mixed-integer non-linear programming framework. The decision variables in this framework are determination of operating points of all generation units in the planning horizon. Also, determination of start-up and shut-down actions for such generating units are considered as control variables of the optimization problem. In order to evaluate the effectiveness of the proposed model, a typical hydro-thermal test system is accepted including 9 thermal units and one hydroelectric ones. Different scenarios are evaluated in this paper to assess the effects of start-up and shut-down costs in the short term planning. The simulation results confirmed that consideration of these costs can dramatically reduce the total start and stop actions.

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References

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Iran-Water Resources Research
Volume 14, Issue 4
June 2018
Pages 216-225

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History

  • Receive Date: 20 November 2017
  • Revise Date: 07 June 2018
  • Accept Date: 16 June 2018

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