Research on the design method of railway traction power supply cable under harmonic restraint

The urban rail transit traction power supply cable bears the important tasks such as power connection and power transmission among the main substation, the traction and buck stations. Due to the greater length of the power supply cable, the series parallel resonance problem caused by the charging capacitor is a serious threat to the safe and stable operation of the rail transit system. In order to ensure the safe and stable operation of power supply and distribution system of urban rail transit system, this paper studies the design and selection of traction power supply cable for urban rail transit under the harmonic constraint. The method can effectively avoid the safety problem of the harmonic series-parallel resonance due to cable charging capacitance in the traction power supply system for urban rail transit users. At the same time, it also has guiding significance for the design of cable length and charging capacity of other power supply and distribution system.