Study of the Modeling and Control Strategy for Active Power Filter

Abstract

Improvement of active power filter’s performance through the reasonable control strategy is becoming a hot research for various counties’ scholars. In this paper, active power filter model is regarded as a starting point and the modeling process has been introduced in detail. For the following characteristics, such as harmonic current detection must be real-time and accurate, active power filter’s uncertainty and nonlinear, the harmonic current detection method which is based on instantaneous reactive power is used. In this way, harmonic current, reactive and negative sequence current in grid can be accurately tested out. The active power filter which is developed according to this current real-time detection algorithm can balance asymmetrical three-phase load. The simulation model is built in MATLAB/simulink. The simulation results show that this active power filter can be more rapid, accurate compensate harmonic current than the conventional active power filter.