Traction and electric power hybrid power supply system for alternating current electrified rail transit engineering

Abstract

A traction and electric power hybrid power supply system for alternating current electrified rail transit engineering can share a 110 kV or 220 kV high-voltage side power supply and simultaneously output a single-phase 27.5 kV traction power supply and a 35 kV or 20 kV or 10 kV three-phase power supply which are respectively used as a traction power supply and a power supply for power loads along the line. 110 kV or 220 kV input power supplies of the substations are introduced into two adjacent substations from a local power grid respectively, three-phase lines of the substations are connected into a traction winding and a power winding on the high-voltage side of the three-phase traction and power hybrid transformer respectively, a 27.5 kV single-phase traction power supply is output through a winding on the low-voltage side of the three-phase traction and power hybrid transformer and is connected with a 25 kV traction power supply network; an output three-phase 35 kV/20 kV/10 kV electric power source is connected with a three-phase isolation transformer original transformer with the transformation ratio of 1: 1, an output three-phase 35 kV/20 kV/10 kV electric power distribution power source is connected with a 35 kV/20 kV/10 kV three-phase electric power distribution network, and meanwhile a neutral point is provided for the three-phase electric power distribution network; and a traction network electric split phase is arranged between traction power supply networks connected with two adjacent substations, and a three-phase power distribution network breaking interconnection switch is arranged between three-phase power distribution networks connected with two adjacent substations.

Description

technical field [0001] The present invention relates to rail transit engineering, in particular to a traction and electric hybrid power supply system for AC electrified rail transit engineering. In the same traction substation, mainly through the integration of a traction and electric hybrid transformer and the cooperative application of an isolation transformer, the Rail transit engineering traction and electric power supply system. Background technique [0002] At present, the rail transit projects in some cities adopt the single-phase AC 25kV power supply mode consistent with the electrified railway to supply power to rolling stock. Therefore, it is necessary to set up a special substation, introduce local 110kV or 220kV power supply, and provide traction power supply and electric power supply for rail transit projects after conversion. Due to the high voltage level of this type of substation, the large capacity and occupied area of ​​the transformer, it is difficult to ...

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Problems solved by technology

[0007] Especially for urban rail transit projects, the driving speed is relatively not too high, and plan 1 will lead to more electrical separation phases on the traction network, which will have obvious adverse effects on the high-density driving operation of urban rail transit pro

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