Adaptive load shedding for isolated power systems

Abstract

Emergency control of frequency in an isolated power system is considered. In many such systems, limited load shedding is permitted under certain generation loss conditions to reduce the expense of spinning reserve provision. It is important in these circumstances to minimise consumer disruption through proper-design of the load shedding arrangements. An adaptive load shedding scheme is proposed, based on intelligent relays supplied with updated values of key system parameters in addition to the usual measurement of frequency. Results are presented to demonstrate the ability of the proposed scheme to reduce potential load shedding to a value close to the theoretical minimum.