Generator having automatic parallel operation function

Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter

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307 87, H02M 545, H02J 100

Patent

active

054265789

ABSTRACT:
An invertor-controlled generator unit is connectible with at least one other generator for parallel operation. The invertor-controlled generator has an invertor circuit which performs switching operation to convert a direct current power into an alternating current power based on a reference sinusoidal signal. Voltage and current of the alternating current power from the invertor circuit are detected. A difference in phase between the detected voltage and current is detected, and a signal indicative of the phase difference is formed. A reference pulse signal is formed in response to the signal indicative of the phase difference for varying the frequency of the signal indicative of the target output waveform in a manner such that the phase difference is decreased. Upon starting of the generator, when the above-mentioned voltage is detected, the signal indicative of the target output waveform is generated at timing dependent on the waveform of the detected voltage, whereas when the voltage is not detected, the signal indicative of the target output waveform is generated at timing independent of the voltage.

REFERENCES:
patent: 3794846 (1974-02-01), Schlicher et al.
patent: 4714869 (1987-12-01), Onitsuka
patent: 5245522 (1993-09-01), Kawaguchi et al.
patent: 5300876 (1994-04-01), Takagi

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