Isolated electrical system including asynchronous machine...

H - Electricity – 02 – J

Patent

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H02J 5/00 (2006.01) B63H 21/12 (2006.01) B63J 3/02 (2006.01) F02N 11/04 (2006.01) H02J 1/10 (2006.01) H02J 3/38 (2006.01) H02J 9/08 (2006.01)

Patent

CA 2265716

An electrical system for use in isolation, the electrical system comprising a main engine (14), such as a gas turbine or a diesel engine, a generator (13) driven by the main engine (14) for generating a first alternating voltage (19), a first rectifier unit (12) for converting the first alternating voltage (19) generated by the generator (13) into a direct voltage on a DC bus (18), and at least one inverter unit (10, 15) for converting the direct voltage of the DC bus (18) into a second alternating voltage (20). The generator (13) driven by the main engine (14) for generating the first alternating voltage (19) is an asynchronous machine coupled directly to the shaft of the main engine (14), and the first rectifier unit (12) also comprises an inverter part for converting the direct voltage of the DC bus (18) into an alternating voltage with an adjustable frequency to said asynchronous machine (13) so as to use the machine as a motor.

Ce système électrique, qui est conçu pour être utilisé dans un lieu isolé, comprend un moteur principal (14), tel qu'une turbine à gaz ou un moteur diesel, une génératrice (13) entraînée par le moteur principal (14) et servant à générer une première tension alternative (19), un premier redresseur (12) servant à convertir la première tension alternative (19) générée par la génératrice (13) en une tension continue sur un bus CC (18), et au moins un onduleur (10, 15) servant à convertir la tension continue du bus CC (18) en une seconde tension alternative (20). La génératrice (13), entraînée par le moteur principal (14) afin de générer la première tension alternative (19), est constituée par une machine asynchrone couplée directement à l'arbre du moteur principal (14), et le premier redresseur (12) comprend également une partie onduleur servant à convertir la tension continue du bus CC (18) en une tension alternative avec une fréquence réglable sur la machine asynchrone (13), pour que cette machine puisse servir de moteur.

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