Research On The Electrical Load Model Of High-speed EMU Based On The Object-oriented Technology

With the accelerated pace of urban life, the high speed EMU has increasingly become the preferred way of people in terms of traffic travel. In fact, EMU will make a large difference in electrical load characteristics during operational process due to the different traction and different strategies, but currently studies on EMU load model are concentrated on the establishment of traction calculation software. Accordingly, this essay makes a research on the overall performance of the vehicle grounding system by using the modeling establishment in terms of object-oriented languages in EMU fundamental and harmonic wave and a kind of domestic new EMU for the study object in order to conduct more detailed simulations on the EMU electrical load model.On the basis of strong understanding of the development of the calculation of traction at home and abroad, this essay will consider two different traction strategies by means of force analysis and mathematical models establishment of CRH2 EMU operational process on a specific line, computer language to simulate the train operation process and output curves, and calculating the fundamental current regarded train as a power source model by using standard TCP/IP protocol to build an interface to transfer data with the server based on Ethernet-based communication technology.This essay makes a conclusion on the effective value of all typical harmonics of line current and change rule of phrase angle according to fundamental wave by analysis of the operating data on the actual line of CRH2 EMU, and makes judgment on EMU operating conditions by the relationship between the phase angle and the fundamental current, and uses the Origin software for curve fitting, sets up mathematical probability density distribution model on both sides of the fitted curve in order to establish the harmonic load models, build each harmonic load model by use of distribution of random process and probabilistic algorithm of center limit theorem, and then compound the waveform under effective value of any fundamental current.The author analyses grounding system mode of all existing EMU type, establishes a mathematical model for the grounding system circuit of a kind of domestic new EMU, and makes use of Matlab/Simulink software to build simulation model to simulate all the car body electric current simulation under different circumstances, and then by field measurement and test data analysis, verifies the relevant conclusions to discuss and analyze current fluctuation phenomena in the measured data. Finally, summarize the relationship between grounding system current and transformer current.This essay will illustrate and describe the achievement of overall structural design and function of the software by applying object-oriented technology (C# language) to compile software and display curve of distributed train simulation. In addition, the output results can be a reference for the relevant operational and design staff.