Study Of Shunt Active Power Filter Based On DSP

As one of the most effective means to eliminate harmonics, Active Power Filter can compensate dynamically power system harmonics. Shunt active power filter (SAPF) is very fit to compensate current source harmonics. The ip-iq harmonics detection method based on the instantaneous reactive power theory is finished, and fully-digital control method of SAPF is studied by means of digital signal processor (DSP).Firstly the research background of the power quality control and shunt active power filter is introduced, and then the system configuration and basic operation principles are discussed.After that, instantaneous reactive power theory is researched; software and hardware of the fully-digital control system based on DSP are designed and achieved. Besides, a novel implementation algorithm of time compare pulse width modulation is proposed on fixed-point DSP. At last the simulation models are built up by the Simpowersystems toolbox of Matlab.The result of simulation and test shows that the shunt active power filter can compensate the current harmonics drawn by current type harmonics source; software and hardware structure of the fully-digital control system based on DSP is designed, which can validly detect harmonics from load current; In harmonic detecting a new digital average filter based on dynamic loop cache is adopted, which is prone to complete on fixed-point DSP and can meet detection requirement; with less time consumption and better performance, the detailed control algorithm and performance of time compare pulse width modulation is fit to program on DSP.