ZYAPF active power filter

The active power filter detects the load current in real time through the external current transformer CT, extracts the harmonic component of the load current through the internal DSP calculation, and then sends the PWM signal to the internal IGBT to control the inverter to generate a current with the same size and opposite direction as the load harmonic, and injects it into the power grid to compensate the harmonic current, so as to realize the filtering function.