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中国电机工程学报 2008, 28(15) 7-15 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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自主均流控制的并联Buck变换器稳定性分析 |
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李明 戴栋 马西奎 李胜男 |
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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) 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:
研究基于自主均流法并联Buck变换器的稳定性问题。基于系统精确的状态方程,数值仿真观察系统随参数变化时呈现的均流失败、低频振荡以及输出电压上浮等现象。使用一种改进的离散建模方法得到系统的映射模型,并结合仿真结果对系统的稳定性进行分析,揭示了低频振荡的Hopf分岔本质。最后给出系统的稳定性边界,讨论了均流环对系统性能的影响。 |
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关键词:
并联变换器
均流
自主均流法
低频振荡
离散映射
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Stability Analysis of Paralleled Buck Converters Under Automatic Master Control |
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LI Ming DAI Dong MA Xi-kui LI Sheng-nan |
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Abstract:
The stability of paralleled Buck converters was studied under automatic master control. Some phenomena including failure of current-sharing, low-frequency oscillation and rise of output voltage were observed in the numerical simulations which were based on the accurate state equations. An improved discrete-time modeling approach is proposed and further used to derive the system's discrete-time iterative map. Thanks to simulation results, the stability of the system was analyzed, and the Hopf bifurcation nature of low-frequency oscillation was discovered. Finally, the stability boundary was given and the effect of current-sharing loop on system's performance was also discussed. |
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Keywords:
paralleled converters
current sharing
automatic master control
low-frequency oscillation
discrete-time map
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收稿日期 2006-11-21 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: 李明 |
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作者简介: |
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作者Email: liming@mailst.xjtu.edu.cn |
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| Copyright by 中国电机工程学报 |