无线充电系统中阻抗匹配的固定时间滑模控制

Fixed Time Sliding Mode Control for Impedance Matching in Wireless Charging Transmission System

为克服DC/DC变换器建模的不确定性和外界干扰对无线充电系统中阻抗匹配的影响,提出了一种新型固定时间滑模控制策略,同时为抑制抖振,设计了一种新型趋近律。该控制策略在传统快速终端滑模面基础上增加一项非线性项,使得在无线充电过程中的等效输入阻抗保持在最优值并且能够保证系统在固定时间收敛。此处提出的控制策略与传统快速终端滑模控制方法相比,系统具有更快的收敛速度、更小的抖振、更高的收敛精度和较强的鲁棒性。仿真和实验结果证明了该控制方法的有效性。

In order to overcome the uncertainty of DC/DC converter modeling and the influence of external interference on impedance matching in wireless charging system,a new fixed-time sliding mode control strategy is proposed,and a new approach law is designed to suppress chattering.The control strategy based on the traditional fast terminal sliding mode surface,which increases a nonlinear term.The control strategy keeps the equivalent input impedance in the optimal value and ensures the convergence of the system at a fixed time,compared with the traditional fast terminal sliding mode control method,the system has faster convergence speed,smaller chattering,higher convergence accuracy and strong robustness.Simulation and experimental results demonstrate the effectiveness of the control method.