Synchrophasor Calculation Algorithm Based on Robust State Estimation

This paper proposes a novel robust state estimation based method for synchrophasor calculation. With the Tukey's Bi-Square technique, the traditional Weighted Least Square (WLS) based state estimation method is upgraded to the proposed Iteratively Reweighted Least Square (IRLS) based robust state estimation method, to better filter out measurement noise and reject bad data. Extensive numerical experiments demonstrate that the proposed method has higher synchrophasor calculation accuracy compared to existing IEEE e37.118 synchrophasor standard, independent of measurement noise level, bad data level and system frequency.