SHEPWM控制的电压源型逆变器的仿真研究

毕业设计（论文）外文摘要Title:Simulation of SHEPWM Controlled Voltage Source InverterAbstract:Inverter is a widely used variable voltage converter,and its control directly affectsthe output of the inverter,thus affecting the load response and the power grid and otherelectrical equipment.Modern inverter is mainly composed of full control devices,whichare controlled by various PWM control technologies,among which the specificharmonic elimination PWM(SHEPWM)technology is one.Using SHEPWM controltechnology can eliminate the specified number of harmonics in the inverter outputvoltage and make the basic wave component of the inverter output waveform higher.This graduation project is aimed at SHEPWM control inverter simulation research.Firstly,the research status of SHEPWM technology is understood,and thethree-level NPC inverter is selected to study the main circuit topology of the inverter.On the basis of being familiar with the working principle of the inverter and SHEPWMcontrol principle,the nonlinear switching Angle equation of NPC inverter usingSHEPWM technology is established.Secondly,the method of solving the nonlinearequations is studied,and the newton-homotopy equation method,which takes the Angleobtained by the method of weight of center of gravity as the initial value,is selected tosolve the nonlinear transcendental equations iteratively.Finally,the simulation model ofNPC inverter controlled by SHEPWM based on MATLAB is established,and thesimulation study of the system is carried out.The simulation results show that theoutput voltage of the inverter is improved when the inverter is controlled by theSHEPWM switch solution.Keywords:inverter SHEPWM To solve the performance