An Research For Modeling And Simulation To Power System Of Electric Bus Based On Modelica

The pure electric bus is the complex engineering systems involved in the mechanical, electronic, control fields. It can reduce the environment pollution that pure electric bus is widely used in public transport. Taking the knowledge reuse as the core, the multi-domain modeling language Modelica is suitable for the complex multi-domain modeling. The simulation requirement of the power system of the electrical bus is higher with the performance analysis and modern optimization development of the complex engineering systems. Therefore, it is imperative for the multi-domain modeling method to establish the power system modelof the pure electric bus.In this thesis, the system framework of the pure electric bus is set up in Modelica.The full dynamic model is analyzed and studied. On this basis, the framework and simulation models of the pure electric buspower system are constructed. And the simulation and analysis of the power systemmodel are finished. The main researching contents are following.1. The mechanism of the Modelica models and the standard model library are studied. The features of the Modelica modeling language are analyzed. The method of the Modelica language compiler and the solution process are researched. And the standard model library and the Modelica tools are analyzed.2. The modeling mechanism of the power system of the pure electric bus is constructed.The common structure of pure electric bus power system is analyzed and the power system is divided into the modulars of the different fields. And the connection mechanism between the models of different fields is analyzed and set up.3. The component models of the electric bus power system are established. On the basis of the component fundamental mechanism, the mathematical models of the power system components are studied. The multi-domain models of the components are established in Modelica, including the motor, the battery, the bus body, the suspension, the tire and other parts of the pure electric bus.4. The modeling, simulation and analysis of the pure electric bus are finished.The framework model of the power system of the pure electric bus is established and the models of the components are instantiated in the framework model. The simulation model of the power system is obtained. The simulation and analysis of this model are accomplished in some specific conditions.