Research on nonlinear control method of active power filter based on online identification

In view of the problem of the active power filter in the filter process of the power grid, the on-line identification observer based on POPOV super stability theory is designed. The mathematical model of APF in DQ synchronous rotating coordinate system is established, and its on-line identification method is analyzed. Given active power filter for online identification of nonlinear control method using POPOV super stability theory, design adaptive observer and the APF online adaptive identification system has good static and dynamic performance, especially the accurate calculation of the compensation current provides better parameter. Simulation results show the validity of the proposed theory and the effectiveness of the control strategy.