Automatic generation control (agc)
Automatic generation control (agc) phrase describing the computer-based process by which electric utilities control individual generating stations to maintain system frequency and net interchange of power on a highly interconnected transmission grid. Automatic generation control (agc) systems monitor grid frequency, actual and scheduled power flows, and individual plant output to maintain balance between actual and scheduled power production, both within transmission control areas and at individual generating stations. Control is generally accomplished by adjusting the speed control (or droop) characteristics of individual generating units. Control actions are determined by planned production schedules and power ex- change agreements among participating utilities.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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