Flexible Methodology Based in Fuzzy Logic Rules for Reactive Power Planning of Multiple Shunt FACTS Devices to Enhance System Loadability

The problem of finding out which positions are the most effective and how many flexible AC transmission system (FACTS) devices have to be installed and controlled in a deregulated environment on economic basis is a question of great significance for the dispatcher. This paper presents a flexible approach based in practical reasoning rules from fuzzy logic theory capable of governing multiple static VAr compensator (SVC) and a group of static compensator (STATCOM) by a flexible adjustment of reactive power injected or absorbed from the network. The main purpose of the presented coordinated strategy is the improvement of index power quality. Reactive index sensitivity coordinated with an expert rules to form a global database as a flexible tool to make an efficient decision about reactive power dispatch and to choose the size of the shunt FACTS controllers. Simulation results show clearly the advantage of this approach to enhance the reactive power planning.