【作者】 罗涛；

【导师】 唐小琦；

【作者基本信息】 华中科技大学 ， 机械电子工程， 2007， 硕士

【摘要】 谐波是电网的主要污染源。为了解决传统整流设备输入电流谐波含量高、功率因数较低的问题,人们提出了多种解决方法。而功率因数校正(PFC)技术是解决谐波污染的最有效方法。目前,单相PFC技术已趋成熟,而三相有源功率因数校正(APFC)技术正成为国内外研究的热点。本文的三相APFC技术的研究,主要包括主电路拓扑和控制策略。为了克服常规的三相APFC电路高成本、控制电路复杂、三相之间相互耦合等缺点,本文提出了两种实用性很强的电路,谐波注入式三相单开关APFC电路和单周期控制的双开关APFC电路。由于数字控制具有简化硬件电路,控制灵活和易于实现先进控制等优点,数字化控制的PFC电路也是当今研究的重点。论文中的单周期控制策略和双环控制策略均可以用数字信号处理器(DSP)得以实现。本文首先研究了三相单开关APFC技术,对整个电路的工作过程、功率因数校正原理、输入电流谐波抑制方法等进行了详细分析,针对普通单开关APFC电路功率因数并不高的问题,着重研究了谐波注入技术,并且论证了单周期控制策略的实用性,为多开关控制方法提供了依据;其次分析了双开关的工作过程,讨论了占空比的变化对这种电路的影响,提出了改进方法,并建立了数学模型,利用Saber软件进行仿真研究,验证了理论分析的正确性,设计了基于DSP的数字控制电路;然后,通过实验样机验证了以上两种电路的可行性,实验表明,本文研究的两种电路都能有效抑制谐波畸变。最后,对本课题研究作了总结和展望。更多还原

【Abstract】 The power network is polluted by harmonic current from the traditional AC/DC converter. AC/DC converter is most widely used in electronic devices. In order to reduce the harmonic pollution of power supply and improve the power factor, more power factor correction technology is used. At present, the single-phase power factor correction(PFC)is already developed, but the three-phase active power factor correction (APFC)is still in the stage of developing.This thesis presents a new control model of three-phase APFC circuit, which based on the model of One-Cycle-Control and has an advantage of low cost and high performance. Further more, this thesis presents a novel dual-transistor three-phase power factor correction circuit. Single-Switch boost type Harmonic Injection APFC circuit and Dual-Switch boost type One-Cycle-Control. APFC circuit have the merits of high control precision, simple circuit structure.The merits of digital control include simple hardware, flexible control and easy to realize advanced arithmetic etc. In the current it is popular to use digital control in APFC circuit. One-Cycle-Control algorithms and multiple-loop Control algorithms can be implemented in APFC circuit by digital signal processors (DSP).At first, this thesis introduces the classification and the virtues and defects of correction technology for active power factor correction. After introducing the operating principle of One-Cycle-Controlled three-phase single-switch Boost rectifier, the reason why the proposed circuit can reduce the input line current total-harmonic-distortion(THD), improving the power-factor and characteristics of the whole system is also given. The advanced dual-switch circuit is proved and introduced the influence of the duty cycle control. Then, Saber is the popular simulation software and used to simulate the propose circuit. Based on the simulation waveforms, an experimental installation is given. Finally, the experimental waveforms and results are given.更多还原