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Security-Constraint Unit Commitment Using Classical And Hybrid Methods

Abdollahi, Amir | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39610 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ehsan, Mehdi; Rashidi-Nejad, Masoud
  7. Abstract:
  8. Fast growing load in power systems associated with a large gap between heavy load and light load periods, generation scheduling and unit commitment (UC) problem has become a crucial issue in Scheduling time horizon. In a vertically integrated power system, unit commitment determines when to start-up or shut-down units and how to dispatch online generators over a given scheduling horizon in order to minimize the operating costs. Therefore main objective of this thesis is selected as unit commitment considering ramp rate, emission and line flow constraints. In this thesis four main works has been done: at first generation scheduling considering next hour is done which may yield to increase reliability and also minimizing cost. Then a novel method for generation scheduling is presented, that in this method minimum down time of units and minimum on time of units have been considered. The next new work proposes a method to determine when to start-up and shut-down units considering low emission problem. A combinatorial economic and emission dispatch is proposed in order to find a significant compromise between costs and emission such that real power supply-demand equilibrium is satisfied. In order to have a significant compromise between costs and emission in problem formulation in the proposed method, two variables are introduced as weighting and scaling factors respectively. At last, line flow limits have been taken in to account and the effect of considering lines in the unit commitment problem have been studied
  9. Keywords:
  10. Production Planning ; Economic Dispatch ; Unit Ramp Rate ; System Emission ; Line Flow Limit

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