Boots – shoes – and leggings
Patent
1993-10-12
1996-05-14
Cosimano, Edward R.
Boots, shoes, and leggings
364483, 307 57, H02J 306, G06F 1900
Patent
active
055174221
ABSTRACT:
A method and apparatus for directly controlling the net power flow on tie lines between different areas of a large electric power system, which provides automatic dynamic control to maintain the stability of the system. Utilizing a sensitivity matrix and simple measurements of real power output from each of the generators in a given area, it is possible to dynamically control the entire system in a way which accounts for loading changes in any area. The control can be implemented using a Flexible AC Transmission Systems (FACTS) technology controller which utilizes the measurements and sensitivity matrix from a given area to determine a derived net power flow from the first area to the remainder of the system, and for comparing the derived net power flow to a set point to provide an error signal which approaches zero as the controller adjusts, for example, a phase angle difference across the tie line to adjust the net power flow thereon. Alternatively, the derived net power flow can be used for scheduling the generation of power in a given area and/or to control a local controller at the generator level.
REFERENCES:
patent: 3913829 (1975-10-01), Fink
patent: 4419733 (1983-12-01), Ross
Gyugi, "A Unified Power Flow Control Concept for Flexible AC Transmission Systems" AC and DC Power Transmission, 1991, pp. 19-26.
Ilic Marija
Liu Xiaojun
Cosimano Edward R.
Kemper M.
Massachusetts Institute of Technology
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