Voltage-phase responsive, inverter disable circuit for system in

Details Voltage-phase responsive, inverter disable circuit for system in Voltage-phase responsive, inverter disable circuit for system in

1988-09-29

1989-10-31

Beha, Jr., William H.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

307 45, 361 85, 323207, H02J 306

Patent

active

048782084

ABSTRACT:
In a system interconnecting inverter apparatus, an inverter for controlling power of an AC power system is coupled, via a coupling reactor, to the AC power system having a system voltage. A system phase signal indicating the phase of the system voltage is detected by a system phase detection circuit in real time. Another phase signal indicating the phase of the system voltage is detected by a comparison phase detection circuit with a predetermined delay time, and the detection result is temporarily stored in the circuit as a comparison phase signal. The system phase signal and the comparison phase signal are phase-compared by a stop circuit. When a phase difference between the system phase signal and the comparison phase signal exceeds a predetermined value, the stop circuit stops the operation of the inverter.

REFERENCES:
patent: 3909621 (1975-09-01), Nollace et al.
patent: 4652770 (1987-03-01), Kumano
patent: 4677309 (1987-06-01), Ogawa
SAND 85-7006, "Protecting Interconnections Between Photovoltaic Generations and Utility Distribution Lines," Electric Research & Management, Inc., Thomaston, ME 04861, Nov. 1985.

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