Buck变换器LPV模型的增益调度控制

来源 :第26届中国过程控制会议 | 被引量 : 0次 | 上传用户:nm100
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  由于开关变换器的输出电压极易受到输入电压或者负载波动的影响,为改善这一情况,本文提出了一种建立在Buck 变换器的线性参数变化(LPV)模型基础上的增益调度控制策略。首先,将Buck 变换器的小信号模型转换成以负载电阻和输入电压作为变参数的LPV 模型,基于LPV 的凸分解方法,利用线性矩阵不等式(LMI)技术对凸多面体各顶点分别设计满足H 无穷性能和闭环极点配置的反馈控制器,再插值各顶点所设计的反馈控制器,综合得到具有多面体结构的LPV 控制器。此方法在线计算量小,容易实现。最后,利用仿真结果验证了此设计方法的有效性,并与传统的鲁棒控制策略的控制器相比较,说明此方法所设计的LPV 控制器受Buck 变换器中输入电压和负载电阻波动影响较小,具有更好的控制性能。
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