Fixed-Time Tracking Control of Wireless Power Transfer Systems with Disturbances and Current Constraints

Abstract

This article investigates the tracking control of the wireless power transfer (WPT) system with disturbances and constraints. Using the generalized state-space averaging method, a small signal perturbation model of the system is obtained. To estimate the perturbation faster and more accurately, the fixed-time disturbance observer is introduced. Then a fixed-time disturbance observer-based controller (DOBC) is designed. In addition, to ensure the WPT current constraint not be violated, tan type Barrier Lyapunov Functions (BLFs) are added. To illustrate the robustness of the WPT system, a 100-watt WPT system is built and the closed system is proved to be effective. Experimental results show that the startup response time of the current is 4 ms without overshoot. Under loads and resonance capacitors changes, the WPT current can also converge to the reference value within 4 ms.