非理想Buck变换器分数阶建模及参数辨识研究

Parameter Identification of Buck Converter Based on the Non-Ideal Fractional Model

基于实际电容和电感本质上是分数阶的事实,针对以往开关变换器建模过程中一些理想化假设会引起较大误差的问题,建立了电感电流连续模式下Buck变换器的非理想状态分数阶模型及状态平均模型,提出了一种用于分数阶模型阶次辨识的改进随机数辨识方法,通过仿真验证了运行非理想状态下Buck变换器的分数阶仿真模型的合理性和可行性,并对Buck变换器分数阶阶次进行辨识,与一般传统的算法对比,结果表明改进的方法具有更高的准确性。

Based on the fact that the capacitor and the inductor are fractional in nature, and some ideal as-sumptions could bring errors during the modeling of the switching converters, the fractional mathematical and the fractional state averaged model of the not ideal buck converter in continu-ous mode operation are built and analyzed, a parameter identification method that can be applied in fractional model is proposed. Finally, to verify the theoretical analysis the simulation model of the buck converter in continuous conduction mode operation is established by using the software of Matlab/Simulink, the validated of the new identified method is validated by compared with traditional methods.