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Power/energy: Hybrid load shedding is frequency based: Time at a given frequency is also important, bringing stabilization in a matter of seconds even when as much as two thirds of the load must be shed

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1 Author(s)

When an electric system imports large amounts of power from outside its area, it needs a new approach to load shedding. Even the best conventional frequency-coordinated shedding may not prevent a blackout when external power is lost and more than 50 percent of the load must be shed. However, a hybrid load-shedding scheme that includes at least one time-coordinated step in addition to several frequency-coordinated steps can readily shed 70 percent and more of the load. Such a concept has been adopted by the Florida Power & Light Co., the Sierra Pacific Power Co. in Nevada, and the Electric Service Commission (Escom) of the Republic of South Africa. The choice of frequency settings of load-shedding relays, load-shed increments, and time delays is critical; it depends on the circumstances at a given utility. The coordination is aided greatly by a computer program, LOAD SHED, developed expressly for this purpose. Hybrid shedding techniques and the LOADSHED program are reviewed.

Published in:

Spectrum, IEEE  (Volume:20 ,  Issue: 2 )