9Lobos T,Kozina T,Koglin H J.Power system harmonics estimation using linear least squares method and SVD[J].IEE Proceedings-Generation,Transmission and Distribution,2001,148(6):567-572.
10Begovic M M,Djuric P M,Dulap S,et al.Frequency tracking in power networks in the presence of harmonic[J].IEEE Trans on Power Delivery,1993,8(2):480-486.
