基于DSP的单相PFC控制器的建模与仿真  

Modeling and simulation of single phase PFC controller based on DSP

作　　者：刘淼 何南南 梅燊华 

机构地区：[1]深圳机械院建筑设计有限公司,广东深圳518027

出　　处：《机电工程》2013年第5期627-631,共5页Journal of Mechanical & Electrical Engineering

摘　　要：为了减少电力电子装置对电网引起的谐波污染,用电装置电源前端加入功率因数校正(PFC)电路是一种主要手段。讨论了以Boost变换器为主拓扑结构的双闭环PFC数字控制系统;根据电路的等效原理,建立了Boost变换器平均电路下的等效电路模型,并采用小信号分析法,将模型中直流信号量和交流小信号量分离,最终建立了Boost电路的小信号模型,在此基础上,采用Bode图法,以闭环系统的带宽和相位裕量为指标,设计了控制系统的PI调节器;最后Saber仿真工具进行了相应的仿真实验。研究结果表明,该控制系统模型可以有效地控制PF值在99%以上,将THD降低到5%以下,达到了理想的控制效果。In order to reduce the harmonic pollution caused by power electronic devices,adding a power factor correction（PFC）circuit in the front end of the power supply of electric device is a mainly means.The double closed loop PFC digital control system,with Boost converter as mainly topological structure was discussed.According to the circuital principle of equal effects,the equivalent circuit model of Boost converter was established under the average circuit mode,and alternating current small semaphore was separated from the direct semaphore using small-signal analysis method,and finally the Boost circuital small signal model was established.On this basis,with the bandwidth and phase margin of closed-loop system as the index,the PI regulator of the control system was designed by using Bode diagram method.Finally,the simulation test was done with Saber.The results show that the control system model can effectively control PF value in more than 99%,THD will be reduced to less than 5%,has achieved the desired control effect.

关 键 词：功率因数校正 PI调节器 SABER仿真 数字信号处理 

分 类 号：TM761[电气工程—电力系统及自动化]