Research of Active Power Filter Using Improved Backstepping Active disturbance rejection control strategy

In order to improve the dynamic tracking speed and anti-disturbance ability of active power filter (APF) to harmonic current, an improved backstepping active disturbance rejection control (ADRC) strategy is proposed in this paper. An improved linear extended state observer (LESO) is established by exploring the principle of deviation adjustment to ensure that the total disturbance can be estimated in a relatively timely and accurately manner. In addition, based on the idea of backstepping design and the Lyapunov function design control law, a compound control strategy combining backstepping method and ADRC is proposed to improve the control precision and dynamic response speed of the system. In addition, the stability of the proposed control strategy is analyzed. Finally, the effectiveness and superiority of the proposed control strategy are verified by comparative simulation.