This paper analyses the mathematical model and control strategies of a Hybrid Active Power Filter with Injection Circuit (IHAPF). The control strategy based on the load harmonic current detection is selected. A novel control method for a IHAPF, which is based on the analyzed control mathematical model, is proposed. It consists of two closed-control loops. The upper closed-control loop consists of a single fuzzy logic controller and the IHAPF model, while the lower closed-control loop is composed of an Adaptive Network based Fuzzy Inference System (ANFIS) controller, a Neural Generalized Predictive (NGP) regulator and the IHAPF model. The purpose of the lower closed-control loop is to improve the performance of the upper closedcontrol loop. When compared to other control methods, the simulation and experimental results show that the proposed control method has the advantages of a shorter response time, good online control and very effective harmonics reduction.

Abstract-The hybrid active power filter is very efficient in filtering harmonics and power factor correction. But its efficiency depends on many factors; including control strategy plays a very important role. Therefore, this paper aims to analyze mathematical model of the hybrid active power filter. On that basis, a comparison between the control strategy according to the load harmonic current and source harmonic current have done. The simulation results have proven to be that: control strategy according to the load harmonic current is more effective the control strategy according to the source harmonic current. This analysis will be the basis of the researches in control of the hybrid active power filter.

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