Research On Shunt Active Power Filter Based On Repetitive Control

The rapid development of power electronic technology,contributing to the modern electric power industry,but more and more serious harmonic problems are caused by that,reducing the electrical energy utilization and efficiency of equipment,increasing the wastage of the equipment.Comparing the various harmonic suppression device comprehensively,active power filter(APF)suppresses harmonic effect is much better than the other devices and also the most widely used,is one of the focus of the researches on the harmonic suppression.This paper,first of all,briefly introduce the harm of harmonic and the theoretical basis of the APF.Secondly,establish mathematical model of parallel three-phase three-wire active power filter.Take instantaneous reactive power theory to extract the harmonic current instruction.Under the synchronous rotating coordinate system,eliminated by state feedback decoupling method of d,q shaft coupling.On the basis of that,take PI control to produce PWM wave separately.Combining the simulation waveform,point out PI control can not improve current waveform quality and decide to adopt the method of the repetitive control,the design procedure is showed.This paper take the method of the PI control and repetitive control used in parallel.Rely on PI control to ensure the speed of response of the system and repetitive control to ensure the accuracy of output current.The simulation results verify the feasibility and effectiveness of the method.At the end through the experiment on the platform to prove that repetitive control of the current control links in active power filter can take a good control efficiently.