Three-Phase Three-Wire Active Power Filter (3P3L APF)

Active Power Filter (APF) is a new type of power electronic device used for dynamic harmonic suppression and reactive power compensation. It can compensate for harmonics with varying sizes and frequencies as well as changing reactive power. The reason it is called an active filter is because, as the name suggests, the device needs to provide power (to compensate for the main circuit’s harmonics). Its application can overcome the shortcomings of traditional harmonic suppression and reactive power compensation methods like LC filters (which can only provide fixed compensation), enabling dynamic tracking compensation. Moreover, it can compensate for both harmonics and reactive power. The power system not only has a three-phase four-wire system, namely the three phases of a, b, and c, plus a neutral line, but also a three-phase three-wire system, where the three lines represent the three phases of a, b, and c, without a neutral line, hence called a three-phase three-wire system. This model of the active filter is designed for a three-phase three-wire power system. The drawings were designed using SolidWorks 2016 software, and the drawings also include the step format.