ANAPFThe series of active power filters connected in parallel in low-voltage distribution systems with harmonic loads can quickly detect dynamically changing harmonic currentsTracking and compensation of time. The principle is:ANAPFSeries active power filters pass throughCTCollect system harmonic current, quickly calculate and extract it through the controllerThe content of each harmonic current generates a harmonic current command, and a compensating current with the same amplitude and opposite direction as the harmonic current is generated through a power execution deviceInject into the power system to counteract the harmonic currents generated by nonlinear loads.