Research on Order Reduction and Control of Double-sided LCC Wireless Power Transfer System Based on GSSA Model

The wireless power transfer system of double-sided LCC topology has the characteristics of high-order and nonlinear, which increases the difficulty of controller design. In this paper, a voltage stabilizing closed-loop control system based on the model of generalized state space average (GSSA) and order reduction is proposed. The GSSA model of the system is established, and the small signal model is established according to the nonlinear characteristics of the system; Then, through the balanced order reduction method, the 17th order system is reduced to the 3rd order system; Furthermore a PI controller is designed to ensure the stability of the 6.6kw electric vehicle wireless charging system, output voltage; Finally, by the simulation results of the closed-loop control system, that the transient response time of output voltage is 15ms and the response time of load switching is 14ms, and the effectiveness of the proposed mothed is verified.