ACCURATE VOLTAGE PHASOR MEASUREMENT IN A SERIES-COMPENSATED NETWORK

This paper describes the feasibility studies concerning an accurate vo ltage phasor measurement in series-compensated network undergoing larg e disturbances. The principal modes of distortions in such a network a re described. Some of these modes are changing with the fundamental fr equency. The phasor evaluation is based on a new digital filter approa ch in which the fundamental frequency is estimated using a least-squar e algorithm. The need to have special potential (voltage) transformers is also discussed. This approach would be used in a shunt reactor swi tching scheme for an overall voltage control of a transmission network .