Active Power Filter Based On Autoregressive Prediction Model Control

As the rapid developing of electronic technology,all kinds of nonlinear and time-varying appliance are widely used,which lead to the problem of harmonic pollution becoming more and more serious,the gridding power quality reduced,In order to improve the quality of electric power,various kinds of harmonic compensation appliance are presented,including the active power filter(APF),which is the most effective means of governing harmonics.Therefore,the key technology have become the focus of research.This article is aimed at the active filter control process and the load harmonic current sampling time delay problem,based on the predictive model estimate solution,and studies active filter to achieve process under the control of predicitive model.Firstly,in view of the problem of time delay of load harmonic current digital sampling among harmonic detection process,from the function continuity,first derivative and second derivative analysis of load harmonic current value in the future relation with historical load harmonic current value,function prediction model is established,to forecast the load harmonic current.The prediction error is analyzed,and the function prediction model is good for the smooth curve.Secondly,in view of the relationship between the load harmonic current of each sampling point,using the historical load harmonic current value and analysis time sequence,establish self-regression prediction model,to forecast the load harmonic current control method.The prediction error is analyzed,and the validity of the regression model is proved.When the load current is mutated,the harmonic compensation accuracy of the active filter is improved by using the recursive least-square method.Thirdly,based on MATLAB/Simulink,the system simulation model is used to verify the accuracy and feasibility of active power filters based on self-regression prediction model.Results show that based on self-regression model predictive control,weakening the influence of load harmonic current sampling time delay,improved the precision of active power filter harmonic compensation.