The ANAPF series active power filters are connected in parallel in low-voltage distribution systems with harmonic loads, and can quickly and real-time track and compensate for dynamically changing harmonic currents. The principle is that the ANAPF series active power filter collects harmonic currents from the CT acquisition system, quickly calculates and extracts the content of each harmonic current through the controller, generates harmonic current commands, and generates compensation currents in the opposite direction of the harmonic current amplitude through the power execution device, which are injected into the power system to offset the harmonic currents generated by nonlinear loads.

Static reactive power generator is a new type of power electronic device used for compensating reactive power. It can quickly and continuously compensate for the varying magnitude of reactive power and negative sequence. Its application can overcome the disadvantages of traditional reactive power compensators such as LC compensators, such as slow response speed, inaccurate control of compensation effect, easy parallel resonance and switching oscillation with the power grid.