Battery is the key technology to the development of electric vehicles,and most battery models are based on the electric vehicle simulation.In order to accurately study the performance of LiFePO4 batteries,an improved ...Battery is the key technology to the development of electric vehicles,and most battery models are based on the electric vehicle simulation.In order to accurately study the performance of LiFePO4 batteries,an improved equivalent circuit model was established by analyzing the dynamic characteristics and contrasting different-order models of the battery.Compared to the traditional model,the impact of hysteresis voltage was considered,and the third-order resistance-capacitance(RC)network was introduced to better simulate internal battery polarization.The electromotive force,resistance,capacitance and other parameters were calibrated through battery charge and discharge experiments.This model was built by using Modelica,a modeling language for object-oriented multi-domain physical systems.MWorks was used to implement the cycle conditions and vehicle simulation.The results show that the third-order RC battery model with hysteretic voltage well reflects the dynamics of a LiFePO4 battery.The difference between the simulated and measured voltages is small,with a maximum error of 1.78%,average error of 0.23%.The validity and feasibility of the model are verified.It can be used in unified modeling and simulation of subsequent multi-domain systems of electric vehicles.展开更多
From the principles of electromechanical energy conversion and electromagnetic torque generation, our study evaluatedthe mathematical model of the electromagnetic torque and the vector control method of motors. An ana...From the principles of electromechanical energy conversion and electromagnetic torque generation, our study evaluatedthe mathematical model of the electromagnetic torque and the vector control method of motors. An analysis of motor typesindicates that the electromechanical energy conversion component is interchangeable. Three distinct types of motor structures,namely DC, induction, and synchronous, are possible, all three being commonly used in pure electric vehicles. For each motortype, simulation models were developed using Modelica, a modeling language for object-oriented multi-domain physicalsystem. A test model of each motor type was configured in the MWorks simulation platform. With a representative motor,specifically the permanent-magnet DC motor, the asynchronous induction motor, and the permanent-magnet synchronousmotor, mechanical properties were simulated and analyzed. The simulation results show that the characteristics of each motormodel are consistent with the theoretical and engineering performance of the representative motor. Therefore, modeling,motor control, and performance testing of a unified multi-pole-field motor, which is used in pure electric vehicles, have beenachieved.展开更多
基金This work was supported by the National Key Research and Development Program of China(No.2018YFB0106204-03).
文摘Battery is the key technology to the development of electric vehicles,and most battery models are based on the electric vehicle simulation.In order to accurately study the performance of LiFePO4 batteries,an improved equivalent circuit model was established by analyzing the dynamic characteristics and contrasting different-order models of the battery.Compared to the traditional model,the impact of hysteresis voltage was considered,and the third-order resistance-capacitance(RC)network was introduced to better simulate internal battery polarization.The electromotive force,resistance,capacitance and other parameters were calibrated through battery charge and discharge experiments.This model was built by using Modelica,a modeling language for object-oriented multi-domain physical systems.MWorks was used to implement the cycle conditions and vehicle simulation.The results show that the third-order RC battery model with hysteretic voltage well reflects the dynamics of a LiFePO4 battery.The difference between the simulated and measured voltages is small,with a maximum error of 1.78%,average error of 0.23%.The validity and feasibility of the model are verified.It can be used in unified modeling and simulation of subsequent multi-domain systems of electric vehicles.
文摘From the principles of electromechanical energy conversion and electromagnetic torque generation, our study evaluatedthe mathematical model of the electromagnetic torque and the vector control method of motors. An analysis of motor typesindicates that the electromechanical energy conversion component is interchangeable. Three distinct types of motor structures,namely DC, induction, and synchronous, are possible, all three being commonly used in pure electric vehicles. For each motortype, simulation models were developed using Modelica, a modeling language for object-oriented multi-domain physicalsystem. A test model of each motor type was configured in the MWorks simulation platform. With a representative motor,specifically the permanent-magnet DC motor, the asynchronous induction motor, and the permanent-magnet synchronousmotor, mechanical properties were simulated and analyzed. The simulation results show that the characteristics of each motormodel are consistent with the theoretical and engineering performance of the representative motor. Therefore, modeling,motor control, and performance testing of a unified multi-pole-field motor, which is used in pure electric vehicles, have beenachieved.
