Variable-speed generator/motor system

Details Variable-speed generator/motor system Variable-speed generator/motor system

H - Electricity

02

P

318/108, 322/7

H02P 9/48 (2006.01) H02J 3/38 (2006.01) H02P 9/00 (2006.01) H02P 9/42 (2006.01)

Patent

CA 1266507

ABSTRACT OF THE DISCLOSURE A generator/motor system comprises a generator/ motor having a primary winding and a secondary winding installed on the motor rotor coupled to a prime mover/load, a main circuit interposed between a power system and the primary winding of the generator/motor, an excitation circuit including a frequency converter inserted between a part of the main circuit and the secondary winding of the generator/motor, a frequency difference detector for determining the difference between the frequency of the power system and a frequency dependent on the rotational speed of the load, and a phase-shift control device for controlling the firing phase of the frequency converter in the excitation circuit by use of a signal from the frequency difference detector as a reference signal. In normal operation, a frequency signal following the frequency of the power system is produced, while at the time of a disturbance of the power system, the same frequency signal of the power system as before the disturb- ance continues to be produced thereby to keep the system in stable operation. For this purpose, a starting electric machine, a synchronous motor and a synchronous generator are aligned, and an output of the synchronous generator is applied to the frequency difference detector.

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