Abstract
In high frequency AC (HFAC) power distribution of electric vehicle (EV), the selection and design of controller determines the performance of LCLC resonant inverter power supply. It is challenging to maintain the stability of the LCLC resonant inverter output AC voltage due to uncertain factors such as input DC voltage fluctuation and load variation. In this paper, an optimal feedback control strategy based on linear quadratic regulator (LQR) theory is proposed to provide good dynamic and robust performance. Firstly, the mathematical model of LCLC resonant inverter is derived and built. In order to eliminate the steadystate error of the output voltage, a simple integral controller is adopted. Simultaneously, the dynamic performance of resonant inverter is improved by converting output feedback into state feedback and LQR theory is used to optimize the feedback controller parameters. Finally, the prototype is simulated by PSIM with a rated output power of 100 W and operation frequency of 25 kHz. The simulation results prove the validity and effectiveness of the theoretical analysis.
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