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Interruptible Load Management in Simultaneous Energy and Reserve Market

Sahebi, Mir Mohammad Reza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42570 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ehsan , Mehdi
  7. Abstract:
  8. In restructured power system, the Independent System Operator (ISO) implements Security Constraint Unit Commitment (SCUC) for clearing of day-ahead market. In this project, SCUC is also uses for simultaneous clearing of energy and reserve market. Spinning reserve and of generating units and Interruptible Loads (IL) are considered as system operating reserves in the proposed model. Some of IL usage restrictions such as maximum load curtailed, maximum curtailment hour in a day, maximum length of each curtailment and etc is also considered. One of these constraints is interruption time (the time between ISO’s request and IL’s Answer) which is very difficult to formulate. Expected Energy Not Served (EENS) is considered as a criterion for system reliability evaluation and an approach is proposed for EENS calculation in presence of interruptible load. In the proposed model, a Two-Stage Stochastic Mixed Integer Programming (SMIP) is proposed for power system uncertainties modeling. In the two-stage model, first stage named base case, includes unit commitment program with transmission lines constraints in pre-contingency conditions and the second stage is about system security providing using of scheduled spinning reserves and interruptible loads in each scenario. The purpose of this program is the unit commitments and their energy production and the scheduled spinning reserve and schedules reserve for each IL for the next day. Monte Carlo simulation is implemented for generating unit and transmission lines random outages, load prediction errors and negative response of the interruptible load to the ISO. Finally, backward scenario reduction method is used for computational burden reduction. The proposed model is applied to the IEEE Reliability Test System (RTS) to demonstrate its effectiveness. The results show that the use of Interruptible loads’ reserve along with their constraints, reduce the system operation costs and have high impact in reliability improvement and reduction in market clearing price in critical or peak hours
  9. Keywords:
  10. Security-Constrained Unit Commitment (SCUC) ; Simultaneous Energy and Reserve Market ; Two Stage Stochastic Programming ; Mathematical Expected Energy Not Served (EENS)

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