Dynamic Modeling And Simulation On Fuel Cell/Ultra-Capacitor Hybrid Electrical Tramway

With the rapid development of the world economy, not only the dependence on energy is growing, the lack of traditional energy sources represented by oil, gas, coal have become more and more obvious, but also the majority use of traditional energy have caused serious of problems, such as air pollution, water pollution and so on. They are serious impact on the sustainable development of the economy. In recent years, for the advantage of high power density, environmental protection, the fuel cell began to enter people’s attention.The continuous progress of urbanization and vigorous increasing of the urban population also caused serious environmental pollution, traffic congestion and other problems. Development of public transport and adhere to sustainable development of green transport is an effective measure to solve these problems. For the large capacity, non-polluting exhaust emission, lower energy consumption, the fuel cell hybrid electrical tramway has brought into focus.This paper mainly studies the fuel hybrid tramway vehicle modeling, establish the suitable simulation driving cycle for the tramway, simulation analyze for different control strategies. The main work in this dissertation is as follows:1.Taking into account the fuel cell hybrid tramway operating region, working place and the output characteristics of the fuel cell, constructed a driving cycle which was suitable for fuel cell/ultra-capacitor hybrid tramway. And correlated with the ADVISOR simulation software.2.By comparing the battery with the ultra-capacitor output characteristics, and combined with the PEMFC slowly dynamic response, relatively soft output characteristics, select the ultra-capacitor as an auxiliary energy source of hybrid system because of its large power density. Analyzes the strengths and weaknesses of different topology types of fuel cell and ultra-capacitor. Finally, selected the parallel topology type according to the actual situation and simulation difficult.3.Through the driving cycle of constructed, accomplish the parameters of the traction motor, fuel cell and ultra-capacitor.4.Analysis of the working principle and establish the simulation model of the power of fuel cell and ultra-capacitor in the hybrid tramway. Mechanical analysis for the tramway based on the unique simulation mode on advisor. A dynamic vehicle model was built and established the traction motors model, fuel cell model, ultra-capacitor model.5.Analysis the switch mode and energy management strategy of power following control. Completed the tramway performance simulation based on the driving cycle which was built in this paper. Obtained working curve of fuel cell, ultra-capacitor, the traction motor and other components. Finally calculated the efficiency of main components in the hybrid tramway.6.Design a fuzzy logic control strategy which choose the traction motor demand power and the ultra-capacitor state of charge values as dual-input, the scale factor as single-output. Then associate the control strategy with ADVISOR. Compare the simulation result in this control strategy with the one which was used the power following strategy. The simulation results shows that:the power following strategy has certain advantage on fuel cell output stability and volatility terms, the dynamic load of fuel cell is smooth. Meanwhile the fuzzy logic control strategy is not only satisfied the power demand of driving cycle, but also greatly improve the vehicle economy and dynamic performance.