Bidirectional converter device applied to subway high-altitude environment and control method

Abstract

The bidirectional converter device applied to the subway high-altitude environment comprises a bidirectional converter and a transformer which are arranged between a direct-current traction network and an alternating-current power grid, the bidirectional converter is composed of five groups of power units which are connected in parallel in a three-stage series connection mode, and the bidirectional converter is connected with the direct-current traction network in a three-stage middle power unit series connection mode. The direct current input ends of the five power units in each stage are connected in parallel, and the alternating current output ends are connected in parallel. According to the control method of the bidirectional converter device, the direct-current voltage is divided into nine working intervals to control operation of the train, the device and the control method can provide electric energy for a subway traction network and can also feed electric energy generated by regenerative braking of the train back to a power grid, circulating current between the devices is effectively restrained, and the service life of the device is prolonged. And bidirectional transmission of electric energy between an alternating-current power grid and a traction network is realized.

Description

technical field [0001] The present invention relates to a bidirectional converter device and a control method, more specifically, to a bidirectional converter device and a control method applied in a high-altitude subway environment. Background technique [0002] In recent years, my country's urban rail transit has developed rapidly. Due to the short distance between urban transportation stations, the particularity of its operation characteristics is that trains start and brake frequently, and a large amount of energy will be generated during braking. Domestic subway traction power supply systems generally use The resistance consumption method consumes this energy or joins the regenerative braking energy feedback device to feed back energy. [0003] The fundamental reason why the braking energy of the subway traction network cannot be reused is that the existing DC traction power supply system uses an uncontrolled rectifier unit to supply power, which can only realize the one...

AI Technical Summary

Problems solved by technology

[0003] The fundamental reason why the braking energy of the subway traction network cannot be reused is that the existing DC traction power supply system uses an uncontrolled rectifier unit for power supply, which can only realize the one-way flow of energy, and cannot feed back the braking energy of the train to the AC grid. go

Images