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In this paper, a digital-analog control scheme for a three-phase shunt active power filter is presented. Three algorithms for determining the active filter compensating current under several mains conditions are investigated and compared. The three single-phase method, the power balance concept and the extension of the p-q algorithm gives good steady-state and transient performances for both harmonics and reactive power compensation under balanced sinusoidal or nonsinusoidal conditions. However the p-q algorithm is still ineffective under unbalanced voltage conditions. The three-phase digital PLL system allows to operate satisfactorily in a wide range of mains frequencies. The close agreement between simulation and experimental results proves the validity of the optimized DC capacitor design and the feasibility of the proposed control methods.
Nicolas Bruyant (Thu,) studied this question.