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DC/DC降压变换器非线性控制及纹波补偿策略

, PP. 35-41

Keywords: 李雅普诺夫(Lyapunov)直接法,Buck变换器,纹波补偿,稳定性,动态性能

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Abstract:

探索基于李雅普诺夫(Lyapunov)直接法的改进型非线性控制策略,结合Buck变换器,构建基本的状态变量误差项Lyapunov能量函数,引入新的比例型电压外环给定,省去外环积分环节以提高系统的动态响应,导出满足系统稳定收敛的控制方程。并在电流内环控制中引入基于负载电流前馈构建的纹波补偿环节,纹波调节方式提升了内环的动态响应,通过匹配控制参量系数达到输出的近似稳态无差。此外,基于系统的小信号线性模型给出控制参数的选取及系统的性能分析。应用积分复位思想,构建出等效的模拟控制电路,给出有关的仿真实验结果,验证了所提控制的有效性。

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