Analysis of synchronous and induction generators in parallel operation mode in an isolated electric system

Abstract

This paper presents first an analysis of a parallel connection of one synchronous generator and one self-excited induction generator, each coupled to its dc machine as well as a capacitor bank with a resistive load connected to the system. In this stage, the voltage and frequency adjustments were done manually. In the second portion, a similar circuit was implemented considering a voltage loop control and a speed loop control to the synchronous generator. These controls kept on the system voltage and frequency stables. The induction generator supplies the part of active power required by load. The synchronous generator controls the frequency and supplies the reactive power and the additional active power. The experiment demonstrated the feasibility and stable operational performance for this alternative and creative parallel arrangement of generators.