Modeling of automatic local controllers in three phase load flow calculation

Abstract

This paper describes the modeling of automatically operated local controllers, based on the scheduled, measured or calculated values of the locally affected network equipment in real time operation of Distribution Management System - Control Center. The model presented is operated in unbalanced, unsymmetrical distribution networks and analyzed in phase domain. Simulated Locally controlled equipment includes various types of Transformer on load tap changers (LTC), Voltage Regulators and Shunts (Capacitors and Reactors). The modeling considers all control parameters with the special consideration of different phase types of the equipment and measurements, transformer connection types, and operation in unbalanced networks. As an addition to previous works in this area, specific and practical problems and considerations to Capacitor flow control, LTC reverse control with Distribution Generation, Parallel and Looped transformer operation are presented.