The Parameter Design And Simulation Of Shunt Three-phase Four-wire Active Power Filters

There is a great market demand to utilize the active power filters (APF) to reduce the harmonics of the power system and improve the power quality in China. Therefore it is worthy of research how to correctly choose the control arithmetic and design the parameters of APF to better its performances at the time of reducing its cost.Aiming at these problems, this paper makes detail study on the parameters design and simulation of a three-phase four-wire shunt APF.Through theoretic reckoning and simulating analyzing, several control strategies for shunt APF were compared and chose ip-iq arithmetic ofthe instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. Based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. Two topologies of main circuit were compared and chose the three-phase voltage-source converter with a split-capacitor as its main circuit structure. The numerical scales of the dc side capacitor and inductance of reactors were calculated. The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF. In addition, the appropriate parameters of snubber circuits and dead-times for IGBT were worked out. Finally, simulation and experiment results proved all the validity and reliability hereinbefore.