boost型开关功率变换器区域自适应控制分析word格式论文.docxVIP

摘要开关功率变换器的稳定性问题一直是学者们关注的重点，特别是当变换器应 用于直流分布式供电系统以及新能源发电系统中时，系统的输入或输出处于大范 围动态变化中，系统稳定性问题变得更为突出。此外，基于某个工作点设计的线 性控制器难以满足变换器的大范围稳定性要求。为此本文将探讨一种基于区域自 适应的控制方法，提高变换器系统对工作点波动的适应能力，以实现系统的稳定 性能改善。首先，论文给出了一种开关功率变换器的稳定边界确定方法。在传统小信号 线性模型基础上得到了 Boost 变换器系统的闭环特征方程，基于劳斯判据导出决定 系统稳定边界的不等式方程组，采用数值法求解得到系统的稳定区域，由此确定 出系统的稳定工作边界，仿真和实验验证了理论结果的正确。所得变换器稳定边 界为控制器的设计提供了理论依据。其次，将区域自适应控制应用到平均电流 Boost 变换器中完善了多点自适应控 制的应用范围，并引入了变换器稳定边界以确定子工作点。主要思路是以变换器 稳定边界为依据对变换器的工作区间进行划分，确定出子工作点的位置，分别设 计子工作点上的补偿器最终构成区域自适应控制器。仿真和实验结果表明，区域 自适应控制能够拓宽变换器的工作范围。最后，针对传统的区域自适应控制中结构切换所存在的扰动影响，提出了区 域自适应控制的改进切换方式。对比分析了传统切换结构和所提的改进切换结构 的切换扰动量，给出了影响扰动量的参数。仿真和实验结果表明，所提的改进切 换结构的扰动量小，对输出电压也基本没有影响。结合所提的改进切换结构重新 构建区域自适应控制，仿真和实验结果表明，与传统区域自适应控制相比所提改 进控制的动态响应得到大幅改善，同时稳定工作范围得到进一步拓宽。关键词：开关功率变换器，稳定工作范围，切换扰动，区域自适应控制，双环控 制ABSTRACTThe stability of power converter is the focus of scholars. Especially in DC distributed power system and new energy power generation, the stability of power converter is becoming more prominent as the input and output of the system is in a wide rang of dynamic changes. So the power converter based on small signal linear model can not ensure its performance. This paper focus on one control method based on region adaptive to ensure its ability to adapt system working point vary and improve its performance.Firstly, a method to determinate the boundary of power converter is proposed. Based on traditional small signal linear model of Boost converter, the closed loop characteristic equation of system is deducted. We can obtain the stability boundary inequality equations using the routh criterion. Using the numerical method to solve these inequality equations, we can get the boundary of switching power converter in the end. Simulation and experiment results prove its correctness. The boundary of power converter can be the guides of converter design.Secondly, region adaptive controller is used to boost converter with average current control to consummate its application area. The working area is divided into multi areas b