改进的Buck-Boost变换器的无源性控制策略

摘要

在建立电流连续模式下Buck-Boost变换器模型基础上,论证了系统的无源性,并通过系统误差模型,详细地推导了系统的无源性控制律.巧妙利用系统阻尼矩阵控制参数的设置,使得系统的动态特性得以充分考虑,并将系统的控制律归算到占空比上,实现了改进的无源性控制策略.最后借助Matlab/Simulink平台进行仿真验证,仿真结果表明,系统输出稳定,动态响应良好,参数鲁棒性强,论证了方法的可行性.%In this paper,the passivity of the Buck-Boost converter is demonstrated based on continuous conduction mode,and the law of passive control of the system is deduced in detail by the system error model.By cleverly using of the damping control parameters,the dynamics of system are taken into account fully.And the control law of system is reduced to the duty cycle,which helps realize the passivity-based control strategies.Finally,MATLAB/Simulink is used to validate the passivity-based control method.The simulation results indicate that the system has stable output,good dynamic response and strong robustness,thus the passivity-based control method is feasible and applicable.