Selective Harmonic Compensation Scheme for Active Power Filters using Generalized Predictive Control

This study proposes a high precision selective harmonic compensation scheme for active power filters, which designed by using the basic theory of GPC. A generalized predictive control (GPC) strategy based on the transfer function model is adopted. The GPC can compensate the delay in detecting the harmonic and the better result of compensation for harmonic can be achieved. As Kalman filter can detect each order harmonic separately, the compensation on delay time arouse from digital implementation is performed. The proposed scheme improves the stability of APF, prompts the precision of harmonic compensation and is applicable to both single phase and three phase inverters. The effectiveness of the scheme is verified by simulation. The experimental results show that compared with traditional controller, the GPC controller can improve the accuracy and robustness of the system and the feasibility of GPC in the program can be proved.