A technique for simultaneous parameter identification and measurement calibration for overhead transmission lines

摘要

The paper deals with the on-line parameter identification of transmission lines from synchronized measurements of current and voltage phasors provided by the phasor measurement units. Particularly because the current measurements contain a systematic error, which strongly influences the identified parameters, a technique for simultaneous parameter identification and measurement calibration will be proposed. The series and shunt line parameters are recursively estimated from the phasor measurements and weather conditions using the extended Kalman filter. Actual line temperature and reference resistance are estimated instead of actual series resistance, which is then computed from these estimates. Two case studies based on data measured from two 1 10kV overhead transmission lines are presented to demonstrate the effectiveness of the proposed approach.