Evaluación de la estabilidad transitoria integral de un equivalente del SNI con penetración eólica y BESS

Abstract

This project evaluates the transient stability of the Ecuadorian National Interconnected System (SNI) in the context of integrating wind energy and battery energy storage systems (BESS). A reduced model of the SNI is proposed using the Ward extended method, optimizing simulations with fewer computational resources and analyzing frequency and voltage stability under dynamic conditions. The development included a reduced equivalent of the SNI obtained using DIgSILENT PowerFactory, integrating wind generators and BESS modeled as virtual synchronous machines. MATLAB was used to implement transient stability analyses, employing differential equations and the ode45 method. Simulations of three-phase faults generated curves of power angle versus time and power versus voltage (PV). The reduced model showed errors below 0.003% compared to the original system. The inclusion of BESS and wind energy moderately improved stability, slightly reducing angular deviations and partially enhancing the response to disturbances. The use of virtual synchronous machines facilitated the integration of renewable energies and improved system control. It is concluded that the reduced model is a valid tool for evaluating the stability of the SNI, contributing to its reliability in the face of future energy challenges. Keywords: Energy simulation, Electrical grids, Mathematical modeling, Dynamic analysis, Power system.