Improvement of Synchronous Generator Charateristics Using Bi-directional Current Phase Control Switch

This paper has suggested a new configuration for reducing the excitation need of synchronous generators. The configuration consists of a synchronous generator connected in series with a bi-directional current switch. The switch injects a series voltage which cancels the synchronous reactance of the generator. The series voltage is automatically generated by absorbing the magnetic energy stored in the synchronous reactance. The excitation level reduction has been verified with experimental results for an island grid. The low change in excitation for various loads also indicates that this concept can be used with constant excited generators, also permanent magnet generators