LOCATIONAL BIAS TO UNSCHEDULED INTERCHANGE (UI) SCHEME FOR UI PRICE IN INDIA

Abstract

The Unscheduled Interchange (UI) scheme has been introduced in India to maintain grid discipline, security and frequency within a frequency band. The present UI price scheme depends on grid frequency. It does not include the system losses occurring due to the UI deviation. Because of this UI account does not settle over a day. This paper suggests a scheme of locational bias to current UI price to include system losses due to UI deviation. This locational bias is found by allocating the losses to system buses. The simulation carried out on IEEE 14 bus system, IEEE 30 bus system and western regional grid 73 bus system.