Electrified railway external power grid power supply structure

Abstract

The invention provides an electrified railway external power grid power supply structure. An external power grid comprises transformer substations and power transmission lines; the A-type transformer substation supplies power to the B-type transformer substation, the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, the B-type transformer substation supplies power to the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, and the C-type transformer substation supplies power to the traction transformer substations through the corresponding power transmission lines; it is defined that the traction transformer substations serve as leaves, the A-type transformer substation serves as a root, the B-type transformer substation and the C-type transformer substation between the A-type transformer substation and the traction transformer substations serve as nodes; through the power transmission lines, the A-type transformer substation, the B-type transformer substation, the C-type transformer substation and the traction transformer substations are connected into a tree-shaped-structure power supply network from the high-voltage level to the low-voltage level; as long as every two adjacent traction transformer substations (leaves) upwards retrospect and can find the same node or root, the intervening subarea substations can communicate, cut-through power supply is implemented, and an equalizing current cannot be generated; and every two corresponding power transmission lines are arranged into one set, capacity standby application is conducted, and traction power supply is not affected under overhauling or breaking down of bus bars of any power transmission line and transformer substation subsection.

Description

technical field [0001] The invention belongs to the technical field of electrified railway power supply, and in particular relates to a power supply mode and an operation mode for an electrified railway traction substation by an external grid. Background technique [0002] In the current electrified railway, in order to distribute the single-phase traction load as evenly as possible in the three-phase power system, the traction network adopts the scheme of alternating phase sequence and phase-separated and partitioned power supply. Insulation devices or insulating anchor segment joints are used to divide the adjacent power supply areas at the phase separation partition to form electrical phase separation, also known as phase separation. Usually, electric phase splitting is set at the exit of the traction substation and the partition between two adjacent traction substations. Electric split phase is the weakest link of the traction network and the bottleneck of power supply....

AI Technical Summary

Problems solved by technology

[0006](2) The operation mode without balanced current needs to switch between two substations, making power dispatching and switching operations difficult

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