Research And Design Of Three-phase Series Active Power Filter

With the development of the electronic information technology,the demand for electronic products is also increasing.But the increase of power electronic products also makes the harmonic problems in public power grid become more and more serious.In order to solve a series of harmonic harms,countries all over the world have pain high attention to it.Active power filter(APF)has become a new deal with the harmonic.It is mainly divided into shunt APF and series APF.One of the series active power filter has the obvious advantages on the voltage type harmonic control.The purpose and significance of this research is to use the SAPF to compensate the reactive power in the power grid,so as to restrain the harmonics effectively and improve the quality of the power grid.Firstly,this paper expounds the concept of harmonic,its generation and its harm.Then it finds the method of restraining harmonic,analyzes the research status of active filter and also the harmonic detecting method and PWM control method both at home and abroad.Based on this,aiming at the series active power filter,selection of main circuit,power switch parameters for different APF capacity selection,DC voltage and static capacitance,DC capacitor size,isolation transformer and LC high frequency filter parameters.Determination of main technical parameters when each module,using Matlab/Simulink platform,the establishment of a three-phase AC power supply,harmonic source and series APF simulation module.Finally it completed the whole modeling of SAPF,through simulation results conclude.Finally,in order to make the DSP control system with various characteristics applied in APF,the micro processing unit and the working principle of the DSP control circuit are analyzed in this paper.In the software aspect,the main program and subprogram are designed,and the method of realizing SVPWM waveform is put forward,which provides a feasible scheme for the application of DSP control system in APF.