AN ISOLATED ELECTRICAL SYSTEM

摘要

An isolated electrical system (100) is energized with a synchronous generator (101) having a rotor provided with permanent magnet poles and also with electrically excited poles. The system comprises an excitation device (102) for producing excitation current for the electrically excited poles. The stator voltage and/or reactive power can be adjusted by controlling the excitation current. A sufficient short-circuit current is achieved by controlling the electrically excited poles to contribute the excitation produced with the permanent magnet poles as a response to a situation in which short-circuit takes place in the isolated electrical system.