Research on Control Strategy of Quasi-Z Source Network DC/DC Converter for Fuel Cell Vehicle

Abstract

DC/DC converter for fuel cell vehicles is required to operate in high voltage gain and wide voltage range conditions, which traditional boost converter is difficult to meet. In this paper, the control strategy of a quasi-zsource boost converter used in fuel cell vehicles is studied. Based on the small signal dynamic modeling method, the double-closed-loop control strategy of voltage and current is adopted. In addition, the input voltage feedforward compensation control strategy is adopted to improve performance in rejecting Input voltage disturbance. A 400W prototype is built for experimental verification. Experimental results show that the proposed input voltage feedforward compensation strategy and double- closed-loop control strategy of voltage and current effectively improve the system dynamic response speed and robustness.