The detection and control strategy of harmonic current is the two key factors which affect performance of active power filter.At present

the study on those two aspects is mainly concentrated on the detection and control of the total harmonic current of load current after elimination of fundamental current.The compensation of total harmonic current can limit both the capacity and flexible application of the active power filter.In this paper

the frequency dividing detection and control strategy for certain specific number of harmonics in the total harmonic current is proposed

the frequency dividing detection is adopted by the Hopfield neural network.This method sets up feedback neural network by the use of energy function to obtain not only the fundamental current and total harmonic current

but

at the same time

detect out the harmonic current of the specific numbers.The frequency dividing control for the specific number of harmonics is performed by the generalized integrator control which can achieve no static error tracking for a particular frequency current.It is proved by the simulation and analysis that the frequency dividing detection and control strategy of the harmonic current proposed in this paper has fast response speed

high accuracy and can be able to meet the performance need of active power filter.