초록 ▼

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 frequen

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 disturbance 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.

대표청구항 ▼

A variable-speed generator/motor system, comprising a generator/motor including a primary winding and a secondary winding, the secondary winding being installed on a motor that is coupled to a prime mover/load, a main circuit interposed between a power system having a power system frequency and the

A variable-speed generator/motor system, comprising a generator/motor including a primary winding and a secondary winding, the secondary winding being installed on a motor that is coupled to a prime mover/load, a main circuit interposed between a power system having a power system frequency 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, frequency difference detector means having input means for receiving the power system frequency and a frequency dependent on the rotational speed of the prime mover/load for determining the difference between the frequency of the power system and the frequency dependent on the rotational speed of the prime mover/load a phase-shift control device for controlling the firing phase of the frequency converter in the excitation circuit, and a sync device means connected to the power system to receive as an input the power system frequency for producing a sync frequency signal following the frequency of the power system under normal operation and for outputting the sync frequency signal to the frequency difference detector means as the power system frequency input such that in the case of a disturbance of the power system, the same frequency signal of the power system as before the disturbance is produced continuously by the sync device means and is input to the frequency difference detector means.