Review of Small-Signal Modeling Methods Including Frequency-Coupling Dynamics of Power Converters
Review of Small-Signal Modeling Methods Including Frequency-Coupling Dynamics of Power Converters
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DOI：
10.1109/tpel.2018.2848980
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发表时间：
2019-04
影响因子：
6.7
通讯作者：
Xiaolong Yue;Xiongfei Wang;F. Blaabjerg
中科院分区：
文献类型：
--
作者：
Xiaolong Yue;Xiongfei Wang;F. Blaabjerg
在过去的几年里，电源变换器的线性化建模技术得到了不断的发展，以捕捉超过一半开关频率的小信号动态。本文综述并比较了基于降压变换器和电压型控制的小信号建模方法。研究了小信号平均建模方法、描述函数建模方法和谐波状态空间建模方法，以便在对电力电子电路以及基于电力电子的电力系统进行建模和分析时能够更好地选择正确的方法。模型比较表明，基于描述函数的模型确实提高了变换器半开关频率以外的建模精度，但无法预测多个变换器之间的频率耦合相互作用（如节拍频率振荡），而需要多输入多输出形式的谐波状态空间模型。
Over the past years, the linearized modeling techniques for power converters have been continuously developed to capture the small-signal dynamics beyond half the switching frequency. This paper reviews and compares the small-signal modeling approaches based on a buck converter with voltage-mode control. The study includes the small-signal averaged modeling approach, the describing function method, and the harmonic state-space modeling approach, in order to be able to better select the correct method when modeling and analyzing a power electronic circuit as well as a power-electronic-based power system. The model comparison points out that the describing-function-based models do improve the modeling accuracy beyond the half-switching frequency of the converter, yet they fail to predict the frequency-coupling interactions (e.g., beat frequency oscillations) among multiple converters, and instead, harmonic state-space models in the multiple-input multiple-output form are required.