Contribution Analysis of Factors Affecting Magnetic Induction Voltage in Subways Using the BP-MIV
Metro traction current changes dynamically during train operation,resulting in magnetic-induced voltage in the peripheral grid circuit,which is one of the key challenges that cause transformers to undergo DC demagnetization.The generation of magnetic induction voltage is affected by various factors.To quantitatively analyze the size of the contribution of different influencing factors,this paper uses the magnetic induction voltage formula to derive the main influencing factors of the magnetic induction voltage of the subway.Subsequently,the"subway line-transmission line"magnetic coupling boundary element model is established to simulate and analyze the influence of the key factors on the induction voltage.The influence of the key factors on the induction voltage is analyzed.During the smooth running of the train,the induced voltage is not significantly affected,and at 1000 m,the induced voltage is attenuated by 90％.We constructed the backpropagation(BP)neural network to generate the magnetically induced voltage and analyzed the contribution of each influencing factor to the magnetically induced voltage using the mean impact value(MIV).The results show that the main influencing factors in the equivalent loop of the subway are the same as those in the grid,and the magnetically induced voltage in the equivalent loop is the same as that in the grid.The results show that the magnetic induction voltage in the equivalent loop is more likely to be influenced by the equivalent loop length,the contribution of which is 44.38％,and the relative distance has the smallest contribution of 21.31％.Therefore,the area of the power system constituting the equivalent loop is the most important factor affecting the magnetic induction voltage.
metromagnetic induction voltageBP neural networkMIV algorithmpower systemdegree of contribution
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