Research On Control Strategy For Three-phase Voltage Source SVPWM Rectifier

The primary factor influence the stable operation of power system is the harmonicpollution which including reducing the quality of power transmission, bringing theharmonic losses, seriously reducing the efficiency of generate electricity. With theincreasing of a variety of power electronic devices, harmonic pollution is increasinglyserious, the efficient control method is of important to economic benefits. Lowerlosses and higher quality are both the hot point of research in recent years. Reducingthe losses of power switch and eliminating harmonic pollution are key point for us tofocus on so as to find the solutions in this field, Methods which were created fromcontrol and structure aspects are of important to further researcher.In this paper, the SVPWM rectifier which has the advantages of adjustable outputvoltage is introduced, it can be used to control power factor, make the grid currentapproach to sine wave by voltage and current double closed-loop feedback control.Torque current and excitation current are controlled separately by field orient controlstrategy for non-linear load, zero reference input is given to reactive power part inorder to achieve unity power factor.The validity has been testified by the simulation results, the harmonic pollution hasbeen reduced, the voltage and current in AC side have the same phase. That is, theunity power factor is realized. on the basis of vector control strategy and the theory ofSVPWM, the simulation model platform has advantage of well response, low loss andhigher utilization of DC source. The control method bring so many advantages, andmore benefits will be emerged with constantly further research in this field.