The Research Of Active Power Filter Based On DSP

With the wide usage of high power nonlinear load and impacts load, problems of gridpower quality are still existing and will be more serious. Our government is giving greatimpetus to the construction of smart power grids and is asserting a higher claim to powerquality of electric system. Meanwhile, user has represented a higher requirements forcompensation precision and reliability of harmonic compensation device. Hence, harmoniccompensation has become a significant research direction.According to the damage and treatment measure of harmonic, this essay is mainly adescription of APF control panel of three-phase four-wire system. We have done thefollowing works:Firstly, the improved instant symmetrical component method based on two-dimensionlinear filter has been designed to detect harmonic current. In order to detect each phaseharmonic current, after each phase asymmetrical fundamental current be detected bytwo-dimensional linear filter, each phase current fundamental harmonic positive-sequencecomponent will be obtained by improving instant symmetrical component method.Secondly, after the improvement of conventional three-dimension voltage vector inverteralgorithm, and option of tri-prism in algorithm and the option method tetrahedron in tri-prism,the utility of algorithm and the conciseness of algorithm operation have been enhanced, whichare apt to the realization of simulation and programme.Thirdly, we use MATLAB simulation software to simulate the harmonic detectingalgorithm and harmonic inversion algorithm, of which the simulation result consist with thetheory analysis.Fourthly, according to the TMS320F2812DSP chip as its core control chip, which hasrealized real-time tracking of harmonic current, myself have designed an APF control panel,on which myself write programme.