KSAPF active power filter device adopts high frequency PWM technology, high performance control chip and fully controlled power electronic devices, using the most advanced control theory and fully digital control method, real-time detection of load current in the power grid, and rapid separation of harmonic current components , And generate control commands according to the magnitude of the harmonic currents, and inject compensation currents of equal magnitude and opposite directions into the power grid in real time to instantly filter out harmonics. At the same time, it can also provide leading or lagging reactive current to improve the power factor of the power grid and realize dynamic reactive power compensation.