基于自适应滑模控制的高动态响应图腾柱PFC研究

High-dynamic-response Adaptive Sliding Mode Control of Totem-pole PFC Converter

PFC变换器是一个典型的非线性系统,宽范围交流输入电压和大幅度负载变化会对系统的鲁棒性造成严重影响。为了提高系统的鲁棒性和动态响应能力,对单相图腾柱PFC变换器自适应滑模控制方法进行了研究,分析了图腾柱PFC变换器的数学模型,基于数学模型和滑模控制理论设计了多个滑模面进行控制,同时为了充分发挥电流内环滑模控制的性能,设计了基于观测器的自适应电压环前馈控制来加速电压环的响应速度,并进行了仿真验证。最后搭建试验平台对比了传统双环PI补偿器和所提PFC自适应滑模控制的性能,验证了所提方法的有效性。

A PFC converter is a typical non-linear system whose robustness is quite susceptible to wide-range AC input voltage and large-step load disturbance.Aiming at improving robustness and dynamic response of the system,this work studied the adaptive sliding mode control method for single-phase totem-pole PFC converters.By analyzing the mathematical model of totem-pole PFC converter,multiple sliding control surfaces were designed based on the mathematical model and sliding mode control principle.Meanwile,an observer-based adaptive voltage loop feed-forward control was designed to accelerate the response of the voltage loop,thereby facilitating full potential of sliding control performance of the inner current loop.The performance comparison with the conventional dual-loop-PI-compensator-based control method carried out on the self-constructed test platform verified the effectiveness of the proposed method.