Control Strategy Study And Experiment Of Active Power Filter Based On DSP

With the widely application of power electronics products, problems of harmonic waves inpower grid are more and more serious. Methods of harmonic control have been one of the hotspotsin power electronic research. Among these ones Active Power Filter has remarkable effect. It canreal time compensate all the harmonic waves in one process.This thesis started with the practical problem of harmonic damages, the author analyzes thesolutions of harmonic problems in power grid at home and abroad, then makes a full compare ofthem. At last, I choose APF as my solution of the harmonic compensation problem.At the first step, the theory and topological structure of Shunt Active Power Filter inthree-phase three-wire system was researched. The thesis employs ip-iq method based onInstantaneous Reactive Power Theory as the harmonic detecting algorithm. Switch strategycombined with hysteresis current controller and space vector was discussed, with this method, wecan not only reduce the on-off frequencies effectively but also raise the precision of currentcompensation.Then a systematic simulation model was built in MATLAB, it simulates the harmonic detectingalgorithm, switch control strategy and system stability. The result concludes that the design proposalwas feasible and effective.According to the analysis result of simulation, a low voltage system of Shunt Active PowerFilter was constructed based on TMS320LF2407A DSP control module. Each module of thehardware system was debugged and the results were analyzed. It concludes that the design of thehardware system can satisfy the design requirements. The software program for the system has beencoded and now in the process of debugging.