Active reactor is composed of a reactor with two coupled windings and a compensation current generator, and injecting a special compensation current into the control winding will adjust the equivalent impedance of the working winding.

A new kind of an active reactor with continuous adjustable inductance and resistance is studied based on the magnetic flux control theory in this paper.

To achieve the mitigation of multiple harmonics with a single LC series branch,a novel auto-tuning filter based on the nonlinear frequency characteristic of inductance of an active reactor is presented,where the active reactor consists of a pair of coupled windings and a generator of harmonic magnetic flux compensation current.

Application of PEBB-based shunt active power filter in rolling mill;

Comparison and simulation of the methods with triangle-wave and hysteresis comparison in current control of shunt active power filter;

Three-phase three-wire series hybrid active power filter based on one-cycle control;

The Active Power Filter(APF) technology which adopts the modern power electronic technology,digital signal processing technology,and advanced control theories can conduct dynamic real-time compensation for gird harmonics,and is an effective approach with great potential to solve harmonic pollution and improve power quality.

The active power filter(APF) connected to the grid through an LCL filter was modeled,multivariable full state feedback was introduced to guarantee the stability of inner loop when considering the characteristics of the LCL,and study of the performance of estimator when considering the influence of the grid was proposed.