Research And Design Of Two-Level PWM Rectifier Based On Voltage Vector Oriented Control

In this thesis,the three phrase two-level PWM rectifier is studied.The type of topology of this PWM rectifier is analyzed in full detail.At the same time,the principle of PWM rectifier is studied in depth through control strategy,SVPWM method and PLL technology.In addition,mathematical model of the two-level PWM rectifier is established in a-b-c three-phrase stationary coordinate system,?-? two-phrase stationary coordinate system and d-q synchronous rotation coordinate system,respectively.Through the transformation between AC variables and DC variables,thereby designing the voltage-current dual loop control strategy with voltage and current PI controller,and also it simplifies the analytical process which lays the theoretical foundation for the following research and design of the PWM rectifier.Currently,during the start of PWM rectifier,the three-phrase power lines will produce very high inrush current,which is devastating for the normal function of IGBT and the stability of the whole system.In addition,designing PWM rectifier needs to think about its dynamic ability.The main algorithm to deal with this problem is adding load current feed-forward control strategy to the dual loop,which can decrease the response time of the system.And also,engineers put forward to the feed-forward controller containing differential term.However,it is lack of researches for improving the anti-load disturbance ability based on using complex state current controller at low switching frequency.Therefore,the researches of this thesis mainly focus on the point mentioned above.By using Matlab/Simulink,it simulates the methods and strategies being proposed,and the result can demonstrate its effectiveness and validity.And then,in order to get fine current tracking,voltage tracking,harmonic rejection,the AC inductance value and DC capacitance value of there-phase two-level restraint and disturbance PWM rectifier are designed optimally.Finally,A experimental platform of three-phase two-level PWM control system based on TMS320F28335 high speed digital signal processor is presented and relevant hardware circuits are designed.