Urban rail transit traction power supply system and train-network matched parameter optimizing method

Abstract

The invention belongs to the technical field of traction power supply and relates to an urban rail transit traction power supply system and a train-network matched parameter optimizing method. The urban rail transit traction power supply system comprises N traction stations, a direct-current contact system, an alternate-current power grid, a track and M to-be-tested trains. By setting inversion voltage starting thresholds of medium-voltage energy feedback devices in the traction stations, direct-current power energy generated by regenerative brake of the to-be-tested trains is inverted into alternate-current power energy with the same amplitude and the same phase as a first alternate current, the regenerative brake ability of the trains is exerted to the greatest extent, and the minimum circuit loss is realized.

Description

technical field [0001] The invention belongs to the technical field of traction power supply, in particular to an urban rail transit traction power supply system and a vehicle-network coordination parameter optimization method. Background technique [0002] The subway traction power supply system uses 24-pulse rectification for power supply. Due to the disadvantage of the diode rectification method that energy can only flow in one direction, when the subway vehicle regeneratively brakes, excess energy will be generated (which cannot be absorbed by nearby vehicles). If it is not processed effectively, It will increase the voltage of the traction network, resulting in the reduction or even disappearance of the regenerative braking capability of the train. The traditional processing method is to consume this part of energy with a resistance energy consumption device, resulting in a waste of energy. [0003] With the development of power electronics technology, more and more su...

AI Technical Summary

Problems solved by technology

The start-up threshold of the inverter voltage of the medium-voltage energy feedback device will affect the voltage distribution of the DC traction network, and then affect the regenerative braking capability of the train and the size of the line loss. However, the traditional vehicle-grid control strategy does not The setting of the start-up threshold of the inverter voltage of the feeder device is optimized, the regenerative braking capacity of the train has not been maximized, and the comprehensive energy saving rate of the system needs to be improved

Images