Amir Mousa Haddadi

  Abstract

  Because of the increasing demand for electric power and limitations of transmission expansion, optimal and safe usage of power systems is very important . Flexible AC transmission systems (FACTS) are suggested as useful and effective tools for realization of this goal. Although these devices have definitive merits but their usage is not widespread because of cost considerations, especially those with more complicated structure like unified power flow controller (UPFC). Thus new combinations of series FACTS controllers (like thyristor controlled/switched series capacitor) and phase shifter are studied in this thesis. These combinations are cost effective and their abilities are similar to that of UPFC. After introducing these new combinations, their steady-state and dynamic operation is analyzed. Transient stability constrained optimal power flow and dynamic stability assessment are used to show the effectiveness of introduced controllers. Power injection model of FACTS controllers is also extracted for steady-state analyses. A fuzzy logic controller is used in order to control dynamic operation of FACTS controllers. Results show that introduced controllers are very effective for steady-state and dynamic control of power systems. A computer program is developed to conduct optimal power flow with FACTS devices in different test systems and with different objective functions.

  Date: Monday, 13 September 2010

  Location: Electronic Research Center

  Time: 10:00 A.M.