Research on the influence of urban metro traction power supply system on power grid harmonics

Urban rail traffic is an ideal transportation in modern city, which also can satisfy the travel demand of citizens. With the expanding scale of urban rail traffic, the harmonic influence which produced by urban rail traffic accessing to the power grid draws more and more attention. The waveform distortion in metro power supply system is derived from rectifier and inverter unit, DC power supply and other electronic devices in vehicle traction power supply system. This paper mainly studies the harmonic problems caused by the traction power supply system, carries on the simulation by using MATLAB and puts forward some effective measures.