Research On Residual Voltage And Fast Space Vector Modulation Control Algorithm Of Multilevel Inverter

The space vector control algorithm,as cascade multilevel inverter type commonly used a control algorithm has a higher utilization rate of DC,and the output phase voltage and line voltage harmonic distortion rate is low.In view of the present of multilevel inverter output residual voltage voltage to restrain or eliminate the fewer control algorithm,on much higher level of how to realize the rapid positioning control algorithm,it is rarely mentioned in the literature,this paper is mainly on the basis of predecessors' two space vector control methods,one is a kind of type that applicable to cascade multilevel inverter output residual voltage voltage SVPWM control algorithm to eliminate,the other is a kind of applicable to the high level inverter space vector control algorithm quickly.Combining algorithm for model building and simulation experiments.Process is as follows:First of all,this thesis introduces several kinds of commonly used multilevel inverter topology structure,the advantages and disadvantages of several kinds of topological structure is given.Facts show that the model cascade multilevel inverter topology structure has better applicability.Secondly,after a series of formulas is derived basic vector of the inverter output residual voltage voltage distribution,then the coordinate plane space vector diagram improves that the residual voltage voltage is zero.Introducing three kinds of feature location quadrilateral,the use of three kinds of feature location quadrilateral region can be used to synthesis of the reference vector,if it is according to this algorithm,it can realize the inverter output residual voltage voltage is zero.Thirdly,on the basis of plane space vector diagram,it improves a rapid SVPWM control algorithm to apply to the high level,the algorithm only needs to reference vector with simple round positioning to determine the basic vector,by according to this,algorithm can achieve rapid positioning in high level inverter.Finally,through matlab simulation model building,the use of THD simulation output waveform,phase voltage and line voltage THD verify the correctness of the algorithm.