The time skew problem in PMU measurements

In this paper, the time skew problem observed in synchronized phasor measurement unit (PMU) measurements is illustrated and analyzed. The term `time skew' is used to describe the faulty sychronization of measurements from different PMUs which are expected to be synchronized based on the time stamps. The origin of the time skew is presented and a practical example is provided to depict the time skew existing in actual PMU measurements. A Kalman filter model is proposed to compensate for the time skew error.

[1]  O. Wasynczuk,et al.  PMU data characterization and application to stability monitoring , 2006, 2006 IEEE Power Engineering Society General Meeting.

[2]  Anjan Bose,et al.  Smart Transmission Grid Applications and Their Supporting Infrastructure , 2010, IEEE Transactions on Smart Grid.

[3]  T.J. Overbye,et al.  Line Outage Detection Using Phasor Angle Measurements , 2008, IEEE Transactions on Power Systems.

[4]  Qing Zhang,et al.  The Integrated Calibration of Synchronized Phasor Measurement Data in Power Transmission Systems , 2011, IEEE Transactions on Power Delivery.

[5]  A. Abur,et al.  Effect of Phasor Measurements on the Choice of Reference Bus for State Estimation , 2007, 2007 IEEE Power Engineering Society General Meeting.

[6]  D.J. Trudnowski.  Estimating Electromechanical Mode Shape From Synchrophasor Measurements , 2008, IEEE Transactions on Power Systems.

[7]  James S. Thorp,et al.  Synchronized Phasor Measurement Applications in Power Systems , 2010, IEEE Transactions on Smart Grid.

[8]  A.G. Phadke,et al.  Recent developments in state estimation with phasor measurements , 2009, 2009 IEEE/PES Power Systems Conference and Exposition.

[9]  Lefteri H. Tsoukalas,et al.  PMU data characterization and application to stability monitoring , 2006 .