Urban rail traffic vehicle braking energy recovery system

Abstract

The invention relates to a system for recovering vehicle braking energy in urban rail transit, which comprises a first direct-current high-speed switch, a charging circuit unit, a super capacitor array, a discharging circuit unit, a variable pressure stabilizing unit, a second direct-current high-speed switch, a DC / AC converter, an alternating-current high-speed switch and an ACU auxiliary control unit; when the vehicle brakes, the system determines the storage energy in the supercapacitor array through the ACU auxiliary control unit and switch with a major loop in real time. Compared with the prior art, the system effectively utilizes energy and reuses the recovered energy in air conditioning or lighting, etc. inside the carriage; the system solves the network voltage fluctuation problemof the prior vehicle regenerative braking energy recovery, and forms an energy recovery closed-cycle control system of the vehicle itself as the main body; in addition, the system cannot impact the network voltage, but only absorb the energy of the self motor train unit; as the supercapacitor used by the system has small size, the management and control of the power source is easier, and the installation mode is more flexible.

Description

technical field [0001] The invention relates to urban rail transit vehicles, in particular to a braking energy recovery system for urban rail transit vehicles. Background technique [0002] At present, the braking energy recovery of urban rail transit vehicles is within a certain range of grid voltage. When the braking voltage exceeds or falls below this range, the traction control unit of the vehicle cuts off the electric energy fed back to the grid, and it is converted into resistance braking. In addition, the utilization of the electric energy must satisfy the condition that there are other trains running simultaneously between the two stations, at this time the train can absorb the electric energy fed back by the braking train, otherwise the braking energy will be automatically converted into resistance braking through the traction control unit of the vehicle And consume. In this method, most of the braking energy is consumed on the vehicle braking resistor, and the gen...

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Problems solved by technology

The system also has the following problems: (1) In the process of energy feedback to the grid, more harmonics will be generated, polluting the grid, and corresponding harmonic control measures need to be added, resulting in unnecessary expenses; (2) medium voltage The cost of the inverter device required by the network is very high; (3) The supercapacitor for energy storage installed in the substation needs a large installation space and higher requirements for control and power management equipment due to its large energy absorption

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