A distributed collaborative absorption method for braking energy in urban rail transit

Abstract

The invention discloses a distributed cooperative absorption method for urban rail transit braking energy. Braking energy utilization devices of adjacent stations are triggered to be put into operation by controlling the absorption voltage of a traction substation braking energy utilization device, so that the regenerative braking peak power of a train which enters a station can be jointly absorbed by the energy utilization devices of the multiple adjacent stations, the power impact on a single station is reduced, better utilization of the regenerative braking energy in a subway system is facilitated, and the probability of transmitting electric energy back to an urban power grid is reduced.

Description

technical field [0001] The invention relates to the technical field of urban rail transit, in particular to a method for distributed and coordinated absorption of braking energy of urban rail transit. Background technique [0002] At present, the traction power supply system of urban rail transit mainly consists of two parts, a traction substation 101 and a traction network 100 . The DC traction substation 101 rectifies the three-phase high-voltage AC 10kV / 35kV into DC750V / 1500V suitable for train operation. The feeder 102 sends the DC power from the traction substation to the catenary and the third rail. The catenary 103 is a power supply line erected along the running rail 104 of the train, and the train obtains power through the contact between the pantograph and the catenary (the third rail). The running rail 104 constitutes a part of the traction power supply circuit, and the return line 105 guides the rail return to the traction substation. Structural diagram such a...

AI Technical Summary

Problems solved by technology

[0004] At present, the existing problems are as follows: 1. The short-term feedback current is large due to the concentration of trains entering the station. To fully absorb this part of energy, a single station needs to be equipped with a braking energy utilization device of corresponding power, resulting in an increase in device cost; 2. When the train brakes in an emergency When starting the braking energy utilization device to absorb energy, due to the existence of the contact line or the third rail impedance, the DC network voltage will still increase beyond the safety limit. At this time, the train needs to use the mechanical brake to cooperate with the stop. This part The energy is consumed by the wear and tear of the brake shoes, and no effective recycling is carried out; 3. The braking energy utilization device adopts the current energy absorption method. Since the energy of a single station is concentrated and returned in a short time, the network pressure of the medium-voltage ring network is raised, and some The energy is not consumed within the subway system but directly returned to other users of the power system, which does not bring direct economic benefits to the subway company, and the subway operating unit has also put forward improvement requirements

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