Multi-objective optimal configuration of current limiting strategies

With the level of short-circuit current of power systems growing increasingly higher, optimal allocation of current limiters has received considerable attention in recent years, especially in China. This paper analyzes two kinds of common used current limiters based on the increment of bus impedance matrix and proposes a multi-objective current limiters configuration model considering the investment of limiters, the level of short-circuit current, as well as the transient stability of power system. An innovative search space reduction technique based on sensitivity factor is introduced to choose better candidate locations for current limiters so as to avoid the curse of dimensionality. The elitist non-dominated sorting genetic algorithm II is used to search the Pareto-optimal solutions of the proposed model. In order to further improve optimization efficiency, master-slave parallel modification of NSGA-II program structure is implemented. The satisfactory case study results demonstrate the feasibility of the proposed multi-objective method in power system current limiters allocation associated with cost, security and stability.