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中国电机工程学报 2008, 28(36) 40-46 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 电力电子与电力传动 |
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采用平均法的含输入滤波器电压型Buck变换器稳定性分析 |
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李明 戴栋 马西奎 |
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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) |
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摘要：
输入滤波器与DC-DC变换器之间的相互作用是分布式电源系统中的一个常见问题。基于平均模型，研究含有2阶输入滤波器和电压型Buck变换器的级联系统稳定性问题。结果表明，输入滤波器对后级Buck变换器稳定性具有双重效果，即根据阻尼电阻Rf的不同，可以扩大或减小独立运行的Buck变换器稳定运行的参数范围。当PI控制器的参数选择在扩大了的稳定性参数范围内， 阻尼电阻Rf的极端增大或减小都会引起系统的低频振荡。这种情况下，现有的阻尼电阻设计标准将不再适用。电路实验验证了理论分析的结果。 |
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关键词：
输入滤波器
Buck变换器
稳定性
平均模型
低频振荡
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Stability Analysis of Voltage-mode Buck Converter With Input Filter Based on Average Approach |
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LI Ming DAI Dong MA Xi-kui |
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Abstract:
Interaction between input filter and DC-DC converter is a common phenomenon in distributed power supply systems. Based on the averaged model, the stability of a cascaded system, which employs a voltage-mode controlled Buck converter and a second-order input filter, was investigated. It is found that the input filter has double effects on the stability of the stand-alone Buck converter. That is, it can either enlarge or decrease the stable region of the parameters depending upon the selection of the damping resistor Rf. If the gain and time constant of the PI controller are selected in the enlarged stable region, extremely increasing and decreasing the damping resistor Rf will lead to instability. In this case, the existing design criterion of the damping resistor will be inapplicable. Experimental results are presented for verifying the theoretical analysis. |
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Keywords:
input filter
Buck converter
stability
averaged model
low-frequency oscillation
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收稿日期 2007-11-15 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 马西奎 |
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作者简介: |
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作者Email: maxikui@mail.xjtu.edu.cn |
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| 参考文献： |
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| 本刊中的类似文章 |
| 1．粟梅 孙尧 覃恒思 张泰山.矩阵变换器输入滤波器的多目标优化设计[J]. 中国电机工程学报, 2007,27(1): 70-75 |
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| Copyright by 中国电机工程学报 |
