毕业设计（论文）--PFC用三相高频PWM整流器的仿真研究.docVIP

PFC用三相高频PWM整流器的仿真研究 院 系：专 业 班：姓 名： 学 号： 指导教师： 2012年5月  PFC用三相高频PWM整流器的仿真研究 PFC with high-frequency three-phase PWM rectifier simulation study摘 要 由于谐波电流可能会引发器件的误动作，干扰相邻的电子电气设备，导致变压器和电机等相关设备出现过热现象；同时也增大了能量的损耗。考虑到以上的问题，本文主要用三相高频PWM整流器进行仿真，其目的是为了提高功率因素。首先，分析了谐波电流的危害、以及低功率因素的原因，表明提高功率因素的意义以及如何实现PFC；其次，对电路结构及其控制原理的向量分析、控制方案的实现和功率因素校正器的设计，这其中包括了前馈电压环节(Fcn(qk))的设计、电压反馈环节(Fcn(bk))的设计和电流环（Fcn(I)）的设计；最后，用仿真软件MATALAB7.0 进行原理仿真。采用上述控制策略，完全可以做到使输入电流与箱入电压同相。 提出了一种三相降压式电容输入多谐振功率因数校正(PFC)电路，并且分析了多谐振PFC的工作原理，采用单相时变简化分析模型，推导了电路元件电压、电流约束关系，绘制了实用的PFC设计曲线。仿真及样机实验结果表明：本文提出的设计方法正确，软开关技术有效；克服了准谐振PFC存在的开关电流峰值大、直流输出纹波大的不足，较好地解决了PFC实用技术存在的问题。Abstract Due to harmonic currents may trigger device malfunction, interference between adjacent electrical and electronic equipment, led to the transformer and motor and other related equipment overheating; but also increases the energy loss.Considering the above problems, this paper uses the three-phase high frequency PWM rectifier simulation, its purpose is to improve the power factor.First of all, analysis of the harmonic current and low power factor, the harm that causes, improve the power factor and the significance of how to realize PFC; secondly, the circuit structure and control principle of vector analysis, control scheme and the realization of power factor corrector design, including the feedforward voltage link (Fcn (QK)). Design, voltage feedback (Fcn (BK)) and the design of current loop (Fcn (I)) design; finally, using simulation software MATALAB7.0 principle simulation.By adopting the control strategy, can make the input current and voltage phase into the box. Put forward a kind of three-phase step-down capacitor input multiple resonant power factor correction (PFC) circuit, and an analysis of multiple resonance principle of PFC, single variable model analysis, deduced the circuit element voltage, current constraint relations, rendering the utility of PFC design curve.Simulation and experimental results show that: the