Buck-Boost基于精确反馈线性化统一控制研究

Study of a Novel Control Strategy for Buck-Boost Converter Based on Exact Feedback Linearization

利用状态空间平均法建模建立了Buck-Boost变换器的数学模型,然后基于非线性系统的微分几何理论,在变换器仿射非线性模型的基础上,推导出了非线性坐标变换矩阵和状态反馈表达式,进而得到了Buck-Boost变换器的精确反馈线性化模型。以此模型为基础,设计了统一控制器使输出电压准确跟踪给定值。最后通过仿真研究和实验验证了所研究控制方法具有良好的动态响应、稳态性能和更强的鲁棒性。

The mathematical model of the Buck-Boost converter is established with the state-space averaging method. Based on the differential geometry theory of the nonlinear system and the affine nonlinear model of Buck-Boost converters, the corresponding nonlinear coordinate change matrix and nonlinear state variable feedback equations are deduced, and then an exact feedback linearization model is established.In order to make the output voltage accurately track the given value, a novel controller is designed.Finally, the result it＇s shown that the control method studied, is of high dynamic response performance, excellent steady-stage characteristics and stronger robustness.