Identification of DC-DC buck converter dynamics using relay feedback method with experimental validation

K. V. Ramana, S. Majhi, A. Gogoi
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引用次数: 10

Abstract

Accurate dynamics of power converters are necessary to achieve good control performance. In this study, the dynamical model of the DC-DC buck converter is identified by the relay feedback method. The relay is connected in the closed loop to produce a limit cycle output. The important information of the oscillatory output is used for the identification. The relay is approximated using dual-input describing function (DIDF) in the mathematical modelling. DIDF can handle symmetric and asymmetric limit cycle outputs. The converter is modelled as a second-order plus dead-time system. Using the gain and phase angle criteria, analytical expressions are derived to estimate the dynamics. The converter dynamics obtained from the proposed method are compared with that estimated using the state-space averaging method. The model is also identified from the real-time experiment. To check the efficacy of the identified model, a model validation test is performed.
用继电器反馈方法辨识DC-DC降压变换器的动态特性,并进行了实验验证
要实现良好的控制性能,必须对电源变换器进行精确的动态控制。本文采用继电反馈方法对DC-DC降压变换器的动力学模型进行辨识。继电器连接在闭环中以产生极限环输出。利用振荡输出的重要信息进行识别。在数学建模中采用双输入描述函数(DIDF)对继电器进行近似。DIDF可以处理对称和非对称极限环输出。将变换器建模为二阶加死区系统。利用增益和相位角准则,导出了动态估计的解析表达式。用该方法得到的变换器动态与用状态空间平均法估计的变换器动态进行了比较。通过实时实验对模型进行了识别。为了检查识别模型的有效性,进行模型验证测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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