外文翻译-三相高功率因数PWM整流器的模型与仿真.doc

1、英文原文Modeling and Simulation of Three Phase High Power Factor PWM RectifierYu Fang*, Yong Xie * and Yan Xing*College of Information Engineering of Yangzhou University, Yangzhou, P.R.China*Aero-Power Sic-tech Center, Nanjing University of Aeronautics and astronautics Nanjing 210016,P.R.ChinaAbstract-N

2、umerical simulation methodology based on high frequency mathematical model of high power factor PWM rectifier is proposed in this paper. And input to output transform function is deduced. With the help of input to output transform function, the design method of voltage regulator has been presented.

3、The simulation for three-phase PWM rectifier is implemented with Runge-kutta, thus comprehensive simulation can be achieved with M file in MATLAB. Finally, the simulation results and experimental results are given. The complete agreement with the results of simulation and experiment manifests that t

4、he proposed simulation method in this paper is effective. Of course, the design period of three-phase high power factor PWM rectifier can be shortened by virtue of proposed simulation methodology.Key words power factor correction; SVPWM; Numerical simulationI. INTRODUCTIONPWM rectifier is main techn

5、ique applied in large unit power factor. Three phase PWM rectifier can be cataloged in voltage and current types, in which current type rectifier may employ many kinds of conventional PWM techniques, however, input line current is discontinuous and output voltage ripple is much larger. While voltage

6、 type topology not only adopt many appropriate control strategies but also implementsbidirectional energy flow, and its main merit is that far dynamic response and simple configure. And smaller input filter can achieve lower EMI. Consequently, the voltage type PWM rectifier is usually served as powe

7、r factor correction.SVPWM is the best way to suppress harmonics 1-4,and used to adjust motor velocity. Especially it can attain low harmonics even in lower operating frequency. SVM can shape the input voltages of three phase bridge converter into rotating circular voltage vector. With the developmen

8、t of DSP, SVPWM have been easilyimplemented so far. And another merit employing SVPWM in PWM inverter can achieve 15% more fundamental component among output voltage. Hence, if employed SVPWM technique in PWM rectifier, the use efficiency of DC voltage will be higher close to unit. As the result tha

9、t the voltage stresses across switches is decreased.The best way to implement SVPWM is digital control.Due to that DSP have been commercialized, high performance digitalized SMPS come to true. However, it is hard to program to implement controller in DSP, which result in longer development period. T

10、his case is remarkable in the design of three phase power factor correction; because in this case many control variables need to control and double closed loops must be accomplished. In face of this point, the numerical simulation methodology based on high frequency mathematical model of high power

11、factor PWM rectifier is proposed in this paper. The simulation program contains the voltage regulator, current controller and the SVPWM, so we can call it comprehensive system simulation for PFC. The total simulation is implemented with M file in MATLAB, hence we only translate the M file into the D

12、SP language to achieve digitalized three phase power factor correction. Consequently the compensation parameters can be optimized in simulation and the design period will be greatly shortened design cost cut. It is clear that the proposed simulation methodology is valuable for fast design of three-p

13、hasePFC and may be used for reference to other digitalized SMPS design.In this paper, the high frequency mathematical model is developed firstly, and then the control to output transformation function is deduced based on instantaneous power theory. It is nature that the voltage regulator is given an

14、d the PI regulator is testified to work here. In this way, we write these mathematic models into program in M file. And finally the simulation results and experimental results are given. The complete agreement with the results of simulation and experiment verify that the proposed simulation method i

15、n this paper is effective.II. MODELING FOR PWM RECTIFIERThe model is important way to analyze the operation basic, dynamic and stable state of PWM rectifier. The studied topology is shown in fig. 1. Assuming that:(1) idea switches(2) ballanced input voltage source(3) without switching dead timeFig.

16、1 Three-phase PWM VRC topology (1) where Em (Im)and Co are amplitude of the phase voltage(current) and angular frequency respectively.A. High frequency mathematical model in ABC fixed coordinateAs shown in fig. 1, Usa、 Usb、 Usc、 are input phase line voltages, isa、 isb、 isc、 input line currents , Rs is resistence of input rail , Ls boost inductor, Cs fiter capacitor; U