Reza Sharifi

  PhD Thesis Defense Session

  Abstract:

  Superconducting fault current limiters (SFCL), connected in series with the transmission and distributions lines, are one of the important protection devices in future power systems. Considering unique characteristics of materials in superconducting state, several configurations including resistive and inductive types are presented to limit the fault current based on this phenomenon.

  The main purpose of this thesis is to propose an algorithm for optimal design of resistive and inductive SFCLs via multiple criteria decision making techniques. To achieve this goal, after a comprehensive survey of previous works, an appropriate model describing electrical, thermal and magnetic behavior of the mentioned SFCLs will be presented to analyse their performance in normal and faulty conditions and to choose important parameters. In the next step, using multiple criteria decision making methods the optimal design process of SFCLs will be explained considering some objectives including optimal limiting performance, minimum losses and voltage sag, appropriate response to transient faults and minimum cost. Then, an improved meta-heuristic multi-objective algorithm will be presented based on simulated annealing to be employed in this purpose. Furthermore, a combined algorithm will be offered to optimize number, size and location of SFCL in power system and the results for the standard IEEE 30-bus test system will be appeared. As an additional study, two new configurations based on autotransformer introduced as well as a modified configuration based on magnetic switch and their performances are analyzed. Electro-thermal modeling and optimization algorithm are made in PSCAD/EMTDC environment and the results are compared by FLUX/2D finite element software.

  Defense Date: Sunday 27/02/2011 Time: 17:00

  Place : Electronic Research Center, Seminar Room