级联开关变换器中源变换器的稳定性机理研究  

Stability Mechanism of the Source Converter in a Cascaded Switching Converter

作　　者：张希[1] 王天石 沙金[2] 包伯成[1] ZHANG Xi;WANG Tianshi;SHA Jin;BAO Bocheng(School of Microelectronics and Control Engineering,Changzhou University,Changzhou Jiangsu 213164;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610097)

机构地区：[1]常州大学微电子与控制工程学院,江苏常州213164 [2]西南交通大学电气工程学院,成都610097

出　　处：《电子科技大学学报》2022年第1期73-82,共10页Journal of University of Electronic Science and Technology of China

基　　金：中国博士后科学基金(2020M671291);江苏省博士后科研资助计划(2020Z103)。

摘　　要：在级联开关变换器中,负载变换器前馈电流纹波可重塑源变换器的输出电压纹波,导致源变换器的稳定性发生变化。以峰值电压纹波(PVR)控制Buck变换器级联峰值电流模式(PCM)控制Boost变换器为例,研究了级联开关变换器中源变换器的稳定性机理。首先,展示了负载变换器前馈电流纹波对源变换器稳定性的影响,分析了源变换器随所选电路参数变化的分岔行为;其次,建立了级联开关变换器具有3种开关状态序列的离散映射模型,推导了其在不动点邻域内的Jacobi矩阵,通过监测Jacobi矩阵的特征根轨迹明晰了源变换器随所选电路参数变化的失稳机理;最后,实验结果验证了仿真分析和理论分析的正确性。In cascaded switching converter,the feedforward current ripple of the load converter can reshape the output voltage ripple of the source converter,resulting in a significant change in the stability of the source converter.Take the peak voltage ripple(PVR)controlled buck converter cascading the peak current mode(PCM)controlled boost converter as an example,the stability mechanism of the source converter in cascaded switching converter is studied.Firstly,the effect of feedforward current ripple of load converter on the stability of the source converter is shown,and the bifurcation behaviors of the source converter with the variation of the chosen circuit parameters are analyzed.Secondly,a discrete-time map model of the cascaded switching converter with three switching state sequences is established,and its Jacobi matrix in neighborhood of the fixed point is derived.Then,by detecting the eigenvalues of the Jacobi matrix,the instability mechanism of the source converter with the variation of the chosen circuit parameters is clarified.Finally,the experimental results are supplied to verify the correctness of simulation and theoretical analyses.

关 键 词：级联开关变换器 离散映射模型 前馈电流纹波 峰值电压纹波控制 稳定性 

分 类 号：TM77[电气工程—电力系统及自动化]