Research On Joint Simulation Of Urban Rail Transportation Train Performance And Power Supply

Relying on two research projects, "Research on simulation and fitting of high-speed railway locomotive and vehicle in traction power calculation" and "Analysis of urban railway train parameters fitting and power supply characteristics", the paper studies joint simulation of urban rail transportation train performance and power supply. The simulation can predict interval running time, assess energy consumption and calculate power supply equipment capabilities. It not only save the pre-construction investment, but also lower the operating cost, so the economic and social benefits of urban rail transportation are improved. It has great theoretical value and practical significance to develop the simulation software of urban rail transportation train performance and power supply which we have independent intellectual property rights.The simulation system of urban rail transportation is composed of two main parts. One is TPS(Train Performance Simulation); the other is NS(Net Simulation). The purpose of TPS is to calculate the performance of trains and determine trains' energy consumption; the purpose of NS is to solution the voltage distribution of the traction electrical network and tracks. It is depended on trains' positions and energy consumptions in TPS.The core issue in TPS is the train control algorithms. An analysis on the energy-efficient control of trains is done in this paper. The motion of trains is described by differential equations to subject nonlinear conditions and the energy-efficient object by the integral of traction. The maximum principle is applied to solve the problem and get the strategies of energy-efficient control. The control strategies, which insure trains safety, are plenty used the grades of the given route with resistances of speed and travel time. It minimizes the energy consumption. In respect that the model is odd, it's necessary to add some operational experiences to get all of the status change points. A numerical calculation algorithm has been developed and used for train performance simulation. As the result of tests, the proposed algorithm could be obtaining effectively energy cost benefit. At the end of this chapter, the fuzzy logic control theory is applied to improve the algorithms. So that it can be used to control discrete class trains.The part of power supply calculation analyzes the external features of DC traction substation firstly. Then it's modeled as three Norton equivalent circuits and the calculation methods of its parameters are proposed. After that, it establishes the physical model of the power supply simulation according to the composition of the traction network with ignoring some secondary factors. In the solution of the electrical network calculation, the sparse matrix technology is used and the flow charts of the process of creating node admittance matrix and the sparse matrix LU decomposition are given.At last, the structure of the simulation software is depicted. Then it introduces the database structure in the system and multi-thread technology. Taking Guangzhou metro line one as example, the performance of the simulation system is tested.