Recursive least squares Harmonic identification in active power filters

A new least squares Harmonic identification technique is developed. This technique is used basically to estimate the fundamental component of the current drawn by nonlinear loads in order to calculate the reference currents of the active power filter on line. The effectiveness of the proposed technique is tested under a sudden change of the nonlinear load. The performance of the proposed technique is compared with the conventional harmonic extraction technique based on the synchronous reference frame method. Simulation results are given for both the proposed and the conventional technique.