Through-type traction power supply system

Abstract

The invention provides a through-type traction power supply system, relating to the technical field of traction power supply. A master transformer station CS<M> comprises a step-down transformer T0, the secondary side of which has more than one winding, and a super compensation system, the secondary side of which has more than one winding; the master transformer station CS<M> is used as a voltagesource, other transformer stations with a step-down transformer and a three phase-single phase cascaded converter N are used as system current sources, wherein the master transformer station CS<M> provides power through a three phase-single phase traction transformer TM, the structure of three phase input and single phase output is adopted, the primary side of the step-down transformer T0 is connected with a three phase power grid, the secondary side has more than one group of winding, three phases of output of the more than one group of winding are separately connected with a reactor in series and then are connected with an input end of corresponding super compensator SCN so as to form a parallel super compensation system SC; and the input end of a master controller MC is connected with athree phase network current, a three phase power grid voltage and a support capacitor voltage of the super compensator separately, and the output end of the master controller MC is connected with thecontrol end of the super compensation system SC.

Description

technical field [0001] The invention relates to the technical field of traction power supply. Background technique [0002] At present, the three-phase-two-phase power supply mode is widely used in electrified railways. The substation takes power from the three-phase grid and passes it through the traction transformer. However, because the voltage phase, amplitude and frequency between the two power supply arms and the substations are difficult to be completely consistent, an electric split phase must be set between the two power supply arms and each substation. The existence of electrical separation seriously restricts the speed and load capacity of the train. And due to the existence of electric split phases, the capacities of substations cannot complement each other, so large-capacity transformers are needed for backup, which causes a lot of waste to the society; when the regenerative braking of trains is running, the energy of regenerative braking can only be fed back t...

AI Technical Summary

Problems solved by technology

However, in order to meet the existing capacity requirements of the railway traction substation, a large number of three-phase-single-phase converters need to be cascaded, the system control is difficult, the reliability is not high, and the cost of the substation is greatly increased. Its overload capacity is weak, and the instantaneous high voltage on the traction network may make it difficult for the traction power supply system to work normally, and it is difficult to adapt to the current demand

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