Simulation Of Single-Phase APF Based On Simulink

With the rapid development of power electronics technology,a variety of non-linear load is widely used,resulting in more and more serious current distortion in the power grid.Active filter is an effective means to solve the harmonic distortion of grid current.Generally,the active power filter is a three-phase active power filter.With the large-scale use of single-phase power electronic equipment,the research of single-phase active power filter is more and more important.In this paper,Simulink simulation is used to analyze the performance and design of single-phase parallel active power filter.The main contents are as follows:On the basis of introducing the passive filter and the active filter of the power system,this paper analyzes the topology and working principle of the parallel active power filter in detail.For the instruction current extraction algorithm,this paper uses the orthogonal operation of the supply voltage and the load current to extract the inductor current by the moving average method.The PWM is generated using the triangular wave carrier modulation method to drive the IGBT.In the control algorithm,this paper uses the basic PI algorithm,according to the system triangular wave modulation cycle,current sampling period,inertia link inductance L resistance R and other parameters to calculate PI control coefficient.Finally,this paper uses MATLAB Simulink software,the design of the program simulation analysis.In this paper,the inductor current generation,SVPWM pulse modulation algorithm,PI control algorithm and the final use of single-phase APF compensation load current harmonics distortion.The simulation results show that the single-phase APF can compensate the current distortion caused by the nonlinear load,but for the fast changing load current,the system needs to further optimize the compensation algorithm to realize the effective compensation of the load current.