Electrical transmission or interconnection systems – Plural supply circuits or sources – Diverse or unlike electrical characteristics
Patent
1993-05-21
1995-06-06
Pellinen, A. D.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Diverse or unlike electrical characteristics
307 87, H02J 306
Patent
active
054225183
ABSTRACT:
A power supply system of a high reliability and stability capable of suppressing a cross current flow by establishing rapidly synchronism between a power converter and an AC power source in a parallel operation for changing over the power supply sources. The power supply system comprises a current sensor for detecting an AC current supplied from a power converter, a comparator for making decision as to whether the AC current exceeds a predetermined value, and a regulation input means for fetching an active component of the AC power supplied from the power converter in response to an output signal of the comparator, wherein when the AC current exceeds a predetermined value, an output frequency of the power converter is speedily regulated so as to coincide with an output frequency of the AC power source in accordance with a drooping characteristic of the active component of the AC power, while in an isolated operation of the power converter, the output frequency is set at a predetermined value.
REFERENCES:
patent: 3932764 (1976-01-01), Corey
patent: 4937462 (1990-06-01), Recker et al.
patent: 5172009 (1992-12-01), Mohan
patent: 5221862 (1993-06-01), Fiorina et al.
Han Y. Jessica
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
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