Harmonic Analysis Based on Prony Method with Acquisition Channel Error Correction

A new harmonic analysis method based on Prony algorithm with acquisition channel error correction is proposed in this paper. A Γ-type equivalent circuit is used to approximate the model of the voltage transformer, and the transfer function of the transformer is established with singular value decomposition (SVD) and total least squares (TLS) method through carrying out two experiments. Then, the data from the secondary side of the transformer are analyzed by Prony method to obtain the preliminary analysis results of harmonics and inter-harmonics. According the amplitude-frequency characteristic and phase-frequency characteristic of the transformer, the preliminary results are modified to obtain the final accurate results. Finally, the validity and accuracy of the method are proved by the analysis of an actual case.