Harmonic detection for three-phase circuit based on the TLS estimation algorithm

Based on the Newton learning algorithm, a new algorithm for TLS estimation and its application in harmonic detection is presented in this paper. It is shown that the LMS algorithm and constrained Anti-Hebbian algorithm are two examples of the proposed algorithm in this paper. The dynamic performance of the TLS algorithm is better than that of LMS and anti-Hebbian algorithms. And the APF based on TLS algorithm can be used under the conditions of three-phase unbalanced and nonlinear loads, can be applicable to detect harmonic, reactive and negative sequence currents respectively or the sum of ones. At the same time the smaller error than that in single-phase can be obtained.