Annealing Search Based Algorithm for Sectionalizing Switches Placement on Radial Distribution Feeders for Reliability Enhancement

The selection of an adequate number of switches and their location is a difficult task in distribution system planning. However, Distribution feeder sectionalization plays a key role in reliability enhancement, balancing, loss reduction, and automation of power distribution systems. The problem of placement of sectionalizing switches in radial distribution system (RDS) falls into the class of discrete variable optimization problem with single minimum. This paper presents the use of simulated annealing (SA) search algorithm in conjunction of previously published general-search technique to determine the optimal number and location of sectionalizing switches in RDSs based on techno-economical feasibility maximization. The problem formulation takes into account reliability, investment, and maintenance costs. The use of SA search greatly reduces the number of candidate locations of the sectionalizing switches with respect to the standalone general search technique. Optimal placement of sectionalizing switches is determined in a variety of distribution feeders. The results show that the combined SA-search technique offers an accurate method for placemat of sectionalizing switches in distribution systems.