基于CLLLC谐振变换器的滑模控制策略
Sliding Mode Control Strategy Based on CLLLC Resonant Converter
摘要: 针对CLLLC谐振变换器提出了一种基于指数趋近率的滑模控制策略。首先通过扫频法进行数学建模,改善了传统建模精确性不足的问题。其次提出了一种基于指数趋近率的优化滑模控制(sliding mode control, SMC)策略,结合变频控制实时追踪最佳频率点,实现了软开关,改善了传统PI控制存在的电压超调量大、动态响应慢、切换负载能力弱的问题。最后搭建了实验平台,通过Matlab/Simulink仿真和实验证明了指数趋近SMC策略的有效性。
Abstract: A sliding mode control strategy based on exponential reaching rate is proposed for CLLLC resonant converter. Firstly, the mathematical modeling is carried out by sweeping frequency method, which improves the problem that the accuracy of traditional modeling is insufficient. Secondly, an optimal sliding mode control (SMC) strategy based on exponential reach rate is proposed, which combines frequency conversion control to track the best frequency point in real time, and realizes soft switching, which improves the problems of large voltage overjump, slow dynamic response and weak load switching ability of traditional PI control. Finally, an experimental platform is built, and the effectiveness of exponential approach SMC strategy is proved by Matlab/Simulink simulation and experiments.
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