부산대학교 도서관

Recent power systems have considerably been susceptible to any kind of instabilities due to their restructuring and liberalization causing maximum exploitation of the installed capacity and then suffering the consequence of closeness to operation and stability limits. Providing an adaptive setting for voltage controlling equipment assists network operators to ensure the achievement of minimum operating cost along with maximum security limit. This goal is attained with the aid of adjusting the set-points of active power output and terminal voltage for generating units as well as absorbing/injecting reactive power of other voltage supporting equipment in transmission network like SVC which all constitute a vector of decision variables. In this paper, an integrated approach on the basis of determining adaptive settings for network controlling equipment with the aim of ensuring maximum loadability limit incorporated into the minimization of total operating cost is proposed. To estimate the loadability limit, a fast method based on VP nose curve using two-port network concept and its relevant parameters [A, B] is presented. Then, two powerful multi-objective evolutionary algorithms (MOEAs), namely ISPEA2 and MNSGA-II, are applied to the optimization problem so as to calculate the adaptive settings for minimizing operating cost along with maximizing voltage security margin. The effectiveness of the proposed method is verified by its implementation in IEEE 39-bus test system using MATLAB software, and the results show its applicability. [ABSTRACT FROM AUTHOR]