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A FREQUENCY ADAPTATION OF DIGITAL PROTECTION FOR PUMPED STORAGE UNITS

Tian Lijun; Lu Yuping; Chen Heng(Southeast UniversityNanjing, 210096 China)  
This paper simulates the starting process of apumped-storage generator/motor by numerical method, pre-sents a fequency-tracking algorithm according to the startingand operating characteristics of pumped storage units. Withthis a1gorithm the acquisition of voltage and current phasorsfor generator-trans fomer unit digital relaying is not affectedby the frequfncy deviation. Performance of this frequencytracking algorthm is evaluated by digital simuIation- Thismethod can be used in other generator relaying and control equipment.
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