Modeling and Power Control Strategy Design for Fuel Cell Hybrid Vehicle

Abstract

An integrated procedure for math modeling and power control strategy design for a fuel cell hybrid vehicle (FCHV) is presented in this paper. Dynamic math model of the powertrain is constructed first, which includes four modules: fuel cell engine, DC/DC inverter, motor-driver, and power battery. Based on the math model, a power control principle is designed, which uses full-states closed-loop feedback algorithm. To implement full-states feedback, a Luenberger state observer is designed to estimate open circuit voltage (OCV) of the battery, which makes the control principle insensitive to the battery SOC (state of charge) estimated error. Full-states feedback controller is then designed through analyzing step in responding to the powertrain and testing data. In the end, the results of simulation and field test are illustrated. The results show that the proposed power control strategy takes into account the performance and economic characteristics of FCHV powertrain components and achieves control object.