本文以双Pwm变换器为基础，分析论述了电力电子装置的整流、逆变和回馈状态的国内外发展状况。随着科学技术的发展，电力电子装置的低功率因数和高谐波污染已经成为电网的两大主要危害，因此提高系统功率因数便是电力电子技术的发展趋势，本文阐述了功率因数的定义，脉宽调制的种类以及电压

型PWM变换器的原理、控制方法等内容，比较了脉宽调制的各种类型，详细推导了三相电压型PWM变换器的数学建模，指出系统各种控制方法的优缺点，着重表达了二相调制脉宽空间矢量WPM的算法推导，选用了系统主控芯片，编写了系统软件程序，设计了交一直一交的主电路结构，针对控制系统的要求，论

文对影响系统性能的几个主要参数进行了理论分析、推导和数值计算。

本文用Matalb仿真软件，对整个控制系统的动态性能进行了仿真与分析，验证了系统理论的正确性和可应用性，对样机的研制提供了强有力的指导作用。

论文最后，讨论了样机实验。通过一系列的实验，记录、分析样机在各种状态下的波形和数据，得出结论，做出展望，为课题的进一步研究打下了一定的基础。

-In this paper, double-Pwm converter, based on analysis of power electronic devices discussed rectifier, inverter and feedback status of domestic and foreign developments. With scientific and technological development, low-power electronic devices, power factor and high harmonic pollution has become the network s two main hazards, thus improving system power factor is the development trend of power electronics technology, this paper, the definition of power factor, pulse-width modulation types as well as voltage

-Type PWM converter principle, control methods, content, comparison of various types of pulse-width modulation, detailed derivation of the three-phase voltage-type PWM converter mathematical modeling, pointing out that the system s advantages and disadvantages of various control methods, focusing on expression of two-phase space vector pulse width modulation algorithm derived WPM, choose the system master chip, the preparation of the system software program designed to pay a d