Optimized Control Method Based on Implicit Arithmetic for Shunt Active Filter

The control strategy based on implicit arithmetic for active filter is proposed. The implicit arithmetic-based control strategy derives the duty cycle function of the bridge arms of each phase under the assumption that the grid current is sinusoidal, thus controlling the switching tubes on and off. It does not require a harmonic detection algorithm to achieve a better harmonic compensation effect. It is able to compensate the reactive power output so as to achieve a power factor close to 1. The main factor that makes this control strategy superior to other control methods is that it can achieve a good control effect in a relatively simple way. Finally, the control method is verified by simulation.