Static power limits of synchronous machines

THIS paper presents an analysis of the determination of static power limits of power systems and offers an accurate method considering resistance, shunt loads, saliency, and saturation. The conventional methods of determining the static power limits of systems composed of synchronous machines and shunt loads based on unsaturated cylindricalrotor theory give only approximate results. It is fortunate that the actual maximum power transfer is generally larger than the calculated value obtained from the customary analysis. Machine saturation and saliency increase the power limit, the difference decreasing with increased system impedance. The validity of the method is shown by the check between experimental values obtained from three small machines and theoretical curves. It was found that errors due to neglecting saturation are more significant than those due to neglecting saliency.