Urban rail transit medium-voltage inverter type renewable energy utilization device

Abstract

An urban rail transit medium-voltage inverter type renewable energy utilization device includes a first rectifier transformer, a first rectifier connected with the first rectifier transformer, a second rectifier transformer and a second rectifier connected with the second rectifier transformer. The urban rail transit medium-voltage inverter type renewable energy utilization device also includes a feedback transformer, an inverter connected with the feedback transformer and a medium-voltage switch connected with the inverter. According to the invention, the device facilitates the recovery of renewable braking energy, requires no configuration of a resistance device, can solve the problems of high resistor heat productivity, large noise and the like, and has remarkable energy-saving effects.

Description

technical field [0001] The invention relates to the technical field of urban rail transit, in particular to a medium-voltage inverter regenerative electric energy utilization device for urban rail transit. Background technique [0002] Urban rail transit has the characteristics of short distance between stations and high vehicle density, and considerable braking energy will be generated during the frequent starting and braking of vehicles. The absorption and feedback of train regenerative braking energy in the urban rail transit power supply system has become one of the very important links. It can not only reduce the temperature rise of tunnels and reduce the wear of vehicle brake shoes, but also have a significant energy-saving effect. [0003] At present, in the field of urban rail transit that has been built, there are mainly the following types of regenerative electric energy utilization devices, resistance energy consumption type, energy storage type and inverter feedb...

AI Technical Summary

Problems solved by technology

[0007] However, the above three types of regenerative power utilization devices have the following technical problems: First, the resistance energy consumption devices installed in the existing lines have the problems of high heat generation and serious noise. At the same time, the resistance energy consumption type device only converts the regenerative electric energy into heat and consumes it, and does not reuse it. Therefore, the resistance energy consumption type scheme is gradually no longer adopted; and the energy storage type device is currently used in the domestic subway There is no successful application case in Zhengxian, and the biggest constraint factor for energy storage devices is the high cost

The flywheel energy storage device is currently subject to the technology of the flywheel device. At present, there is only one supplier in China that has the supply capacity. At the same time, the price of the flywheel energy storage device is higher than that of the supercapacitor energy storage device; The device is limited by the installation capacity of the distribution transformer in the substation, and it is difficult to increase the capacity. At present, the domestic low-voltage inverter device with a DC 1500V can achieve 1200W, while the low-voltage inverter device with a DC 750V can achieve 900kW. The instantaneous power of energy is very high, usually exceeding 2MW. Therefore, it is difficult for low-voltage inverter devices to meet the needs of rail transportation, and it needs to be used in conjunction with resistive devices.

Therefore, with this scheme, the problems of high heat generation and high noise of the resistance energy consumption scheme still exist

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