VOLTAGE STABILITY USING RECTANGULAR STATIC MODAL ANALYSIS FOR POWER SYSTEMS IN THE PRESENCE OF DISTRIBUTED GENERATION

Resumo

Static modal analysis has been a study tool used to identify critical buses or areas of an electrical system related to voltage stability. In this article, the methodology proposed is based on the rectangular coordinate representation of the nodal voltage phasors. With the expansion of Distributed Generation (DG) in Brazil and around the world, it is essential to evaluate the stability levels of electrical power systems. The aim of this proposal was therefore to use simulations to evaluate the voltage stability criterion, considering the insertion of DG into the system. Rectangular modal analysis was applied to evaluate the behavior of the system and identify the advantages and disadvantages that the allocation of a DG can bring to the network in terms of voltage stability. To implement the methodology, tests were carried out for rectangular modal analysis on a fictitious, simple distribution network with a radial topology, comparing the performance prior to the installation of a renewable source and its performance after insertion. The results obtained show that DG has a positive impact on the system, with an increase in the voltage stability margin, especially when the DG is allocated to the load buses.