INSGA-II implementation for optimal placement and design of flux-lock type superconducting fault current limiter with tap changer for improving distribution system reliability

Abstract

Improved non dominated sorting genetic algorithm II (INSGA II) implementation for the assignment of the optimal location and tap changer adjustment related to flux lock type superconducting fault current limiter with tap changer (TC FLSFCL) is presented in this paper. TC FLSFCL is a flexible SFCL that has preference over previous SFCLs. In this type of SFCL the current limiting characteristics are improved and the fault current limiting level during a fault period can be adjusted by controlling the current in the third winding, which also makes the magnetic field apply to the high Tc superconducting (HTSC) ele ment. Three objective functions, based on reliability index, reduction of fault current, and number of installed TC FLSFCL, are systematized and improved non dominated sorting genetic algorithm II (INSGA II) style is then formed in the search for the best location and tuning of the tap changer of TC FLSFCL to meet the fitness requirements. A decisionmaking procedure based on the technique for order preference by similarity to ideal solution (TOPSIS) is used for finding the best compromise solution from the set of Pareto solutions obtained by INSGA II. In a distribution network as bus 4 of Roy Billinton test system (RBTS), comparative analysis of the results obtained from the application of the resistive SFCL (RSFCL) and TC FLSFCL is pre sented. The results show that optimal placement of TC FLSFCL compared with RSFCL can improve reli ability index and fault current reduction index with a less number.