Sepic变换器直接电流控制

基于李亚普诺夫直接法和输入输出线性化控制法,提出了一种新型Sepic变换器直接电流控制策略。建立了Sepic变换器单输入单输出仿射非线性系统模型。采用李亚普诺夫直接法,建立了Sepic变换器李亚普诺夫直接法控制系统。在李亚普诺夫直接法的基础上提出了一种直接电流控制方法,通过直接控制电感电流,间接获得期望的输出电压。比较分析发现该直接电流控制法比李亚普诺夫直接法控制结构更简单,控制代价更低,易于数字实现。数值仿真和实验结果验证了所提控制策略的正确性和优越性。基于所提控制方法的系统输出无稳态误差,并对负载扰动具有较强的鲁棒性。

Direct current control of Sepic converter

Based on Lyapunov's direct method and input/output linearization control theory,a direct current control method was applied to control Sepic converter.The single input single output nonlinear affine model of Sepic converter was set up.The Lyapunov direct method control system was proposed.On the basis of Lyapunov's direct method analysis,a novel direct current control method was applied to control Sepic converter,and the output voltage can be controlled indirect through the regulation of the inductor current.Through comparative analysis,it was found the control structure of the direct current control system is simpler than the Lyapunov's direct method control system and the control cost is also less than the latter.The validity of the control scheme was verified by numerical simulation and experiment results.Highly accurate steady output and strong robustness to the disturbance of load were gained based on the proposed control scheme.