峰值电压反馈 Superbuck 变换器中分岔与混沌的实验研究

该文针对太阳能光伏发电系统中一种重要的拓扑结构 Superbuck 变换器进行非线性动力学研究。根据变 换器的状态方程，采用频闪映射方法得到变换器的离散映射模型，然后以参考电压为分岔参数得到电感电流的分岔 图。最后通过建立实验电路来研究变换器的非线性动力学行为，验证系统从稳定到倍周期分岔直至混沌态的演化过 程，同时通过分析电感电流的功率谱图，证明应用混沌技术可以有效地降低系统的电磁干扰(EMI)。 

The nonlinear dynamics of Superbuck converter is investigated because Superbuck converter is a kind of important topology in the solar photovoltaic power generation system. The discrete mapping model of Superbuck converter is derived by stroboscopic mapping method, based on state equation of the converter. Then the bifurcation diagram of the inductor current is got with the reference voltage as the bifurcation parameter. Finally, the nonlinear dynamics of Superbuck converter is studied by setting up the experimental circuit to verify the whole evolution from stable state to the period-doubling bifurcation state until the chaotic state. On the other hand, ElectroMagnetic Interference (EMI) of the system is effectively reduced through the application of chaos theory by analyzing the power spectra of the inductor current.