Electrical system for turbine/alternator on common shaft

F - Mech Eng,Light,Heat,Weapons – 02 – N

Patent

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Details

F02N 11/04 (2006.01) F01D 15/10 (2006.01) F02C 7/26 (2006.01) F02C 7/268 (2006.01) F02C 7/275 (2006.01)

Patent

CA 2273944

An electrical system (1) for a turbine (10)/alternator (1) comprising a gas driven turbine (10) and permanent alternator (3) rotating on a common shaft comprised of an inverter circuit (17) connectable either to an ac output circuit or the stader winding of the alternator. A control circuit during a start up mode switches the inverter circuit to the stader winding of the alternator (3) and during a power out mode switches the inverter circuit (17) to the ac output circuit. Thus during that start up mode the alternator (11) functions as a motor to raise the speed of the turbine (10) to a safe ignition speed and in the power out mode the electrical system (1) outputs to the ac output circuit, k electrical power having a frequency unrelated to the rotational speed of the alternator (3).

La présente invention concerne un système électrique destiné à un turboalternateur constitué d'une turbine à gaz et d'un alternateur à aimant permanent tournant sur un arbre commun. Un circuit onduleur équipant l'ensemble peut se connecter soit à un circuit d'entrée courant alternatif soit à l'enroulement stator de l'alternateur. En mode lancement, un circuit de commande commute le circuit onduleur sur l'enroulement stator de l'alternateur, et en mode production d'énergie, le circuit de commande commute le circuit onduleur sur le circuit de sortie courant alternatif. Ainsi, en mode lancement, l'alternateur fonctionne comme moteur tendant à faire monter la vitesse de la turbine jusqu'au régime d'allumage sécurisé, et en mode production d'énergie, le système électrique débite sur le circuit de sortie courant alternatif un courant électrique de fréquence indépendante du régime de rotation de l'alternateur.

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