Output voltage control of inductive power transfer system based on extremum seeking control

Inductive power transfer (IPT) system facilitates contactless power transfer across an air-gap through weak magnetic coupling. The controller design for IPT system is very difficult owing to load and system parameter variations, very high operation frequency, strong non-linearity and discreteness. In this study, an extremum seeking control (ESC) strategy is proposed for the output voltage control of LCL-type IPT system. The design of ESC strategy is regarded as a numeral optimisation problem; therefore, a parallel chaos optimisation algorithm will be applied to solve this numeral optimisation problem. In every iterative step of the ESC, the optimal target state is derived from extremum seeking sequence, which drives the operating conditions of system approaching to the target state with good performance. Several simulations and experiments are used to test the performance and the robustness of the proposed ESC strategy for IPT application.