Research On Fundamental Magnetic Flux Compensation Active Power Filter Based On Predictive Current Control

The paper detailed presents the generation and the management way of harmonic and overseas and domestic research trends of active power filter,moreover,through the advantages and disadvantages of comparative analysis of active power filter topology and control method,this paper puts forward a new kind of active filter design scheme based on the combination of prediction current and magnetic flux compensation.In this design scheme,predictive current control algorithm is introduced on the basis of fundamental magnetic flux compensation,the predictive control algorithm can eliminate the control delay and improve the current tracking performance of APF by using the discretization method.Compared with hysteresis control algorithm,there are no shortcomings as switching frequency is not fixed,switching noise is large and easy to produce the pulse current,and can be very good suppression of current ripple phenomenon.This paper focuses on researching predictive current control algorithm of APF,the basic idea of the proposed control algorithm is to use system discretization model to predict compensation current output state of the next sampling time,to determine the control function of current sampling times,and then choose the appropriate switch signal to control the inverter,makes the inverter can be rapidly and accurately track fundamental wave current.This paper sets up a system structure and mathematical model of predictive current control from its basic characteristics,and by introducing a feedback correction link to eliminate the influence of parameter error and external factors,finally,the performance of the whole system is analyzed.After system design is completed,system model is set up under the simulation environment based on MATLAB/Simulink,the simulation results verify the effectiveness and feasibility of the predictive current control method which is applied to the fundamental magnetic flux compensation active filter.Finally,on the basis of this,an experimental platform of control algorithm is built.