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Preliminary studies of voltage vs.speed relationship, analysis of stability of generated voltage and voltage compensation of the self-excited induction generator are presented.In order to improve the voltage regulation, the long-shunt connection of the capacitors to the generator is used. The magnetizing inductance of the machine is used as a saturable reactor. The values of the capacitors for series and parallel connections are obtained from the saturation characteristics of the machine Experimental results are reported. The maximum voltage drop was about 4%.

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SUMMARYThe double-fed induction motor (DFIM) is analysed in this paper with regard to stability. Firstly, its characteristic equation is obtained by means of a linear model for small variations, with the stator resistance equal to zero. The range of speeds for which the DFIM/Load system presents stable synchronous operation is obtained by applying the Routh-Hurwitz Criterion to the characteristic equation. Secondly, by employing the equation for the steadystate electromagnetic torque, with a non-zero stator resistance, another range of speeds giving stable synchronous operation is obtained, and confirmed by some experimental results. In order to confirm the stability, some results of the DFIM/Load system simulation and the characteristic equation root-locus are also presented.

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