Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Patent
1979-07-23
1981-02-17
Griffin, Donald A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
363 95, 307 66, H02J 332
Patent
active
042517354
ABSTRACT:
A control circuit for a force-commutated inverter connected intermediate a regenerative DC power source and a power grid, the power source/inverter combination operative to supply AC electrical energy to, or receive AC electrical energy from or adjust the power factor of, the AC electrical energy of the power grid. The control circuit of the present invention varies the real power component and the reactive power component of the electrical energy flowing between the electrochemical cell and the power grid through the use of two feedback loops with separate time constants. The first feedback loop allows for the independent control of the magnitude and direction of both the real power component and the reactive power component of the AC electrical energy flowing to or from the power grid. The first feedback loop also has a relatively slow time constant so that the power flow between the DC source and the power grid is substantially unaffected by transients. The second feedback loop has a fast time constant for rapidly adjusting the effective magnitude and phase of the voltage waveform from the inverter to compensate for instantaneous or short duration voltage surges which periodically appear on the power grid.
REFERENCES:
patent: 3461374 (1969-08-01), Rhyne, Jr.
patent: 3551778 (1970-12-01), Ekstrom
patent: 3768001 (1973-10-01), Thorborg
patent: 4178629 (1979-12-01), Allen et al.
patent: 4186434 (1980-01-01), Cowett, Jr.
Dwyer James L.
Griffin Donald A.
Lange Richard P.
United Technologies Corporation
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