Realization Of Interactive Train Traction Calculation Software For Power Supply Calculation

Traction calculation is a study of the force on the train and train running along the track under the external force as well as related issues.Nowadays,most of the traction calculation softwares are compiled by the traffic department.For the power supply department,the current traction calculation software is not good enough to describe the electrical load characteristics during operation.Therefore,it is necessary to adopt the interactive traction calculation software for power supply.Based on the project of"Power System Simulation Calculation Software Platform for Urban Railway System Engineering",this thesis was entrusted by Shenzhen Municipal Design and Research Institute Co.Ltd.and used for engineering design and verification.First of all,requirements of software were analyzed in this thesis.For power supply calculation,the power source model,employed in simulation calculation,was to describe the electrical load characteristics of train.Besides,the impact of dynamic power factor of train and the neutral sections of lines in the process of calculation were considered.In aspect of interactivity,the detailed analyses of simplicity in traction software interface and the manual intervention for traction strategy were also described.Secondly,the basic theory of multi-particle model traction calculation was analyzed in detail.The multi-particle train model was established and the force analysis was conducted,which is to obtain the motion equations of the train and thus the modeling method for the power source model of train.Then,the control method during train operation process was analyzed.Firstly,three typical traction strategies were introduced,including the fastest traction strategy,the energy conservation traction strategy and the optimization strategy.Secondly,the energy conservation strategy was designed considering such passenger's comfort level.On the basis of the current energy saving strategy,passenger's comfort was taken into account.On the other hand,in operation of energy saving,the potential energy was gathered when train downs the slope,so as to maintain or increase the function of the train.This method also saves energy of the train.Thirdly,the design and achievement of traction strategy using manual intervention was the key point.In details,this automatic driving strategy cooperated with traction,braking,coasting and cruise,which realizes the real-time control of the operation condition of train during train operation and different running conditions of train can be better simulated.Finally,based on the object-oriented technology,the software interface of traction calculation and the calculation method were achieved by using C#programming language.The ability of manual intervention of train traction calculation was improved and the interface effect and interactive performance were also enhanced.The last validation for accuracy of the program was conducted by using data of Shenzhen metro line 17.The accuracy of the calculation results meet the requirements of the designers.