KNOWLEDGE-BASED EXPERT-SYSTEM FOR OPTIMAL REACTIVE POWER-CONTROL IN DISTRIBUTION-SYSTEM

In this paper a knowledge-based expert system for the general capacito r placement problem is formulated by taking into account the practical aspects of capacitors, load constraints and operational constraints a t different load levels. The developed expert system uses the simulate d annealing (SA) technique for global optimal solution for reactive po wer compensation. The SA technique is made suitable for an expert syst em by providing the initial estimate and placement of reactive sources using the set voltage magnitude method (SYM). A set of rules is devel oped which is capable of modifying the step size of the control variab le when ever the toggling of the control direction is detected. Genera l rules are developed for optimal reactive power control. The develope d expert system is tested for a practical 85-bus radial distribution s ystem of Mysore City, South India. The results obtained are encouragin g and acceptable in practice.