With the extensive application of power electronic devices and the access to distributed energy

the power quality problem of low-voltage distribution network is becoming more and more serious. In order to improve the power quality at the point of common coupling (PCC) in the low-voltage distribution network with multiple harmonic feeders

a distributed active power filter system is created. By estimating the contribution of each harmonic feeder to the voltage harmonic distortion on PCC

the harmonic compensation duty of each feeder is optimized. Furthermore

by adopting the virtual harmonic impedance based droop control

autonomous coordination between multi-function devices is achieved

and an optimization algorithm for the capacity allocation of the harmonic compensation is proposed with reference to the harmonic contribution. In the end

the effectiveness of the proposed model is verified by simulation results. This work is supported by Fundamental Research Funds for Central Universities (No. 0800219170).