中国电机工程学报 2008, 28(18) 1-5  DOI:      ISSN: 0258-8013 CN: 11-2107/TM
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单级功率因数校正变换器
低频不稳定
边界碰撞
功率因数
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戴栋
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单级功率因数校正变换器中的低频不稳定现象研究
戴栋 李胜男 张波 马西奎
电力设备电气绝缘国家重点实验室(西安交通大学) 电力设备电气绝缘国家重点实验室(西安交通大学) 电力设备电气绝缘国家重点实验室(西安交通大学) 电力设备电气绝缘国家重点实验室(西安交通大学)
摘要： 研究了由Boost 变换器和Forward变换器级联构成的单级功率因数校正(power factor correction，PFC)变换器中的低频不稳定现象。通过数值仿真观察了系统随着输出功率增大时出现的低频振荡现象及其对输入电流总谐波畸变的影响。根据Forward变换器电感电流导电模式的临界条件得到了相应的稳定性边界，并对低频不稳定现象的边界碰撞分岔本质进行分析和讨论。通过实验研究，验证仿真结果。该文的研究有助于更好地理解单级PFC变换中的动力学行为，对该系统参数设计也具有一定的参考价值。
关键词： 单级功率因数校正变换器   低频不稳定   边界碰撞   功率因数  
Study of Low-frequency Instability in Single Stage PFC Converter
DAI Dong LI Sheng-nan ZHANG Bo MA Xi-kui
State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University) State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University) State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University) State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University)
Abstract: Low-frequency instability in a single stage PFC (power factor correction) converter is studied, which employs a cascade configuration of a boost converter and a forward converter. First, the low-frequency instability and its effect on total harmonic distortion are observed via numerical simulation as the output power increases. Then, stability boundary is obtained through the critical condition of inductor current conduction mode of the forward converter. The nature of this instability phenomenon is analyzed and considered as border collision bifurcation, and its mechanism is further discussed. Finally, experiment is carried out to verify the results from simulation. The study is helpful to better understand the dynamical behavior of single stage PFC converter, and is also valuable to parameter design of this system.
Keywords: single stage power factor correction converter   low-frequency instability   border collision   power factor  
收稿日期 2006-12-01 修回日期 1900-01-01 网络版发布日期  
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