Under Frequency Load Shedding Based on Dynamic System Information

Abstract

Under Frequency Load shedding is an effective mechanism to prevent a disturbance – induced collapse of a power system. Ceylon Electricity Board (CEB) also uses such a system with the support of under frequency load shedding relays. The load shedding table used for this is a static one which has some inherent drawbacks. An intelligent load shedding system can provide faster and optimal load relief by using actual operating conditions and knowledge of past system disturbances /Rekha 2013/. This paper proposes an intelligent load shedding scheme which uses a regularly updated load shedding table avoiding the shortcomings of the currently used system. Superiority of this scheme is demonstrated through simulation studies using Power System Simulator for Engineering (PSS/E). Application of the proposed scheme can further minimize events of total failures /Ghaz 2012/ while completely avoiding unnecessary load shedding which obviously is a nuisance for the respective customers.