Excitation capacitance required for an isolated three-phase induction generator supplying a single-phase load

Abstract

This paper presents a new scheme using eigen techniques for the steady-state analysis of an autonomous three-phase Y-connected self-excited induction generator (SEIG) feeding a single-phase resistive load through an excitation capacitor connected between the line and the neutral. An approach based on a three-phase induction-machine model is employed to derive dynamic equations of the studied SEIG. Steady-state characteristics of three different configurations of the studied SEIG are clearly examined and compared. Both eigenvalue and eigenvalue sensitivity are employed to determine minimum and maximum values of the excitation capacitance required for self excitation of the studied SEIG. Experimental results obtained from a laboratory 1.1 kW induction machine driven by a DC motor are also performed to validate the effectiveness of the analyzed results.