New load shedding scheme for reliability improvement of an existing transmission network: A case study

Under frequency load shedding has been widely used to restore the power system frequency following a severe generation demand unbalance due to a disturbance. If system frequency is not counteracted properly system will be led to major blackouts. This frequency decline may be corrected by shedding certain amount of load so that system is back to stable state. This paper reports a case study on Sri Lankan power system. Existing under frequency load shedding (UFLS) scheme of Sri Lankan power system was reviewed. Then modification and improvement was made to match with the present network expansions and reduce the load shedding amount while maintaining system stability.