DC voltage control for the three-phase four-wire Shunt split-capacitor Active Power Filter

This paper introduced the control strategy of the three-phase four-wire shunt split-capacitor active power filter at first. Afterwards, we discussed the stability of DC voltage at the two special environments. The one is the nonlinear load varied fast and large. In this time, the arithmetic for pick-up the harmonic current reference will have an infection to the stability of DC voltage. When we use the direct harmonic-wave-pick-up arithmetic not fundamental-wave-pick-up arithmetic, we have a better stability of DC voltage. Another is the grid voltage fluctuated. We can use a drop regulator to control DC voltage. Finally, from the simulation and experiment, we validated the direct harmonic-wave-pick-up arithmetic and the drop regulator can improve the stability of the APF system and the use rate of the DC voltage, at the same time ensure the compensate performance of the APF.