Análise de Faltas Elétricas em um Gerador Síncrono de Velocidade Variável Controlado por Conversor Back-to-back de Três Níveis

Abstract

The contribution of variable-speed generators in modern electrical systems has grown, mainly due to the installation of wind turbines. These generators use different configurations of electrical machines and electronic converters, one of the main ones being the combination of synchronous generators and three-level bi-directional voltage source inverters. One of the points that must be evaluated is their operation during the occurrence of electrical faults. Within this context, this article aims to present an analysis of electrical faults in salient- pole synchronous generators controlled by back-to-back three-level Neutral Point Clamped converters. A simulation performed on the Simulink software, in which electrical faults were defined on a variable-speed setup, was used as case study. It was noted that faults directly affect the behavior of the variable-speed generator and that differences in measured variables can be used to distinguish between faults occurring on the grid or generator side.