Steam turbine controller having method and apparatus for...

F - Mech Eng,Light,Heat,Weapons – 01 – D

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Details

F01D 17/00 (2006.01) F01D 17/06 (2006.01) F01D 17/24 (2006.01) G05B 13/02 (2006.01)

Patent

CA 2352421

In a preferred embodiment, the invention relates to a steam turbine (10) having a speed-loop droop governor (32) with two load--frequency error gains (44, 46) (droops). The first gain (fast change) may be a conventional high gain (44) that is used for power loads that have a constant frequency. When using only the first gain, the high rate of the first gain causes the droop governor to shut off steam to the turbine if the speed of the turbine drifts above a narrow speed range centered on the rated speed set-point. The second gain 46 (slow change) is a low gain that causes the droop governor to tolerate a wide range of turbine speeds about the rated speed set-point (36).

Dans un mode de réalisation idéal, l'invention concerne une turbine à vapeur qui comprend (10) un régulateur d'arcure de boucle de vitesse (32) avec deux gains d'erreur de fréquence de charge (44, 46) (arcures). Le premier gain (changement rapide) peut être un gain élevé conventionnel (44) qui est utilisé pour les charges de puissance ayant une fréquence constante. Quand on utilise uniquement le premier gain, le taux élevé du premier gain fait en sorte que le régulateur d'arcure coupe la vapeur de la turbine si la vitesse de celle-ci dépasse une gamme de vitesses étroite centrée sur le point de contrôle de la vitesse prévue. Le deuxième gain 46 (changement lent) est un faible gain qui permet au régulateur d'arcure de tolérer une vaste gamme de vitesses de turbine près du point de contrôle de la vitesse prévue (36).

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