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Modeling on Traction Power Supply System of Metro and Analysis Its Influence to the Power Network

Author: AiBing
Tutor: WuGuangNing
School: Southwest Jiaotong University
Course: High Voltage and Insulation Technology
Keywords: The subway traction power supply system Harmonic Capacitive current Reactive power compensation Resonance overvoltage Stray current
CLC: U231.8
Type: Master's thesis
Year: 2010
Downloads: 353
Quote: 7
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Abstract


The fast metro urban rail transit construction, on the one hand to promote the development of the city, on the other hand has accelerated socio-economic development, the subway traction are highly concerned about the impact of the power supply to the public grid. Subway traction system uses DC traction volatility system rich harmonic content, cable capacitive current. In addition, the subway system in a densely populated urban public grid once the cause of an accident may be a great impact on the power supply and social stability of the entire city. As a precaution in advance to make the theoretical analysis of the system and make the appropriate preventive measures, thereby reducing the current harmonic resonance over-voltage cable capacitive currents and stray currents and other hazards on the power system to improve power grid power quality and supply reliability and stability, to eliminate the potential risk of accidents caused by the subway on the grid. Therefore, this paper combined simulation case study analysis of metro traction power supply system on the public grid. Matlab / simulink to build a 24-pulse rectifier and subway electric locomotive simulation analysis model. The DC side of the transformer winding and the AC side harmonic characteristics of the system. The running results show that the simulation system can truly reflect the actual work of the rectifier and locomotives. Xi'an Metro Line will soon put into operation for the analysis of numerical examples, the application of the actual design parameters, joint power grid and subway traction power supply system load running daytime peak of the load operation and nighttime trough the harmonic injection to assess the different load period harmonic hazards, based on the PCC point harmonic standards and subway running characteristics, the paper proposes a specific harmonics governance programs, simulation verify the correctness of the program. Simulation results show that the 35kV busbar system installed on the passive high filter, can achieve better harmonic control. Calculation of the power frequency and capacitive current of the cable in the single-phase fault conditions, the resonant circuit equivalence principle, the of cable capacitive current resonant relationship to calculate the capacity of the end of the line shunt reactor using the installation of shunt reactors suppress resonant voltage generation. Using the simulation model to analyze the changes in load, short-circuit capacity of the power factor of the system power quality, voltage fluctuations and PCC point of impact, and to assess its impact on the public grid. Finally, using CDEGS Software Stray current circuit equivalent to Xi'an subway design parameters, and the establishment of rail, drainage net, buried transmission cable model system to study the distribution of rail potential and stray current distribution characteristics and buried The cable shield Potential Distributions, buried cable anti-corrosion measures. The research of this paper provides a theoretical basis for the traction power supply system connected to the grid for the subway. At the same time, laid a good foundation for the planning and construction and design of the subway.

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CLC: > Transportation > Rail transport > Special railway > Mass Transit Railway > Metro Power , electrical equipment
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