开关频率与电源频率比值较小时单周期控制PFC变换器的建模及稳定性  

Modeling and Stability Analysis of OCC PFC Converter With Low Ratio of Switching Frequency to Power Frequency

作　　者：毛鹏[1] 谢少军[1] 许泽刚[1,2] 

机构地区：[1]南京航空航天大学自动化学院,南京210016 [2]常州工学院电气工程系,常州213002

出　　处：《电工技术学报》2010年第4期82-88,共7页Transactions of China Electrotechnical Society

基　　金：博士点专项基金资助项目(20070287009)

摘　　要：针对运行于开关频率与基波频率比值较小条件下的单周期控制功率因数校正(PFC)变换器,通过建立其大信号和小信号模型,并进行分析,揭示了单周期控制PFC变换器存在的基波相移问题、功率极限问题,在此基础上推导了系统稳定运行的必要条件,分析了系统的稳定工作区;给出了滤波电感值的选定方法和电压控制器的设计方法;仿真和实验验证了理论分析的正确性。建立的分析模型及得出的系统稳定运行的必要条件,对应用于较高基波频率场合的单周期控制PFC变换器的设计具有重要参考价值。Large-signal model and small-signal model of one-cycle-controlled power-factor-correction （OCC PFC） converter with low ratio of switching frequency to power frequency are built. Through the built model, the problem of phase displacement and power limitation are revealed, stability condition of the system is deduced and the steady operation region is analyzed. The method of calculating filtering inductance and the designing the voltage controller are given. The validity of the theory presented in this paper is proved with simulation and experimental results. The proposed model and stability condition have more valuable reference to the design of OCC PFC converter with relatively high power frequency.

关 键 词：单周期控制PFC 建模 基波相移 功率极限 稳定性 

分 类 号：TM461[电气工程—电器]