A self-adaptive recovery device and recovery method for braking energy of multiple train units

Abstract

The invention discloses a braking energy self-adaptive recovery device and a recovery method for an EMU, belonging to the technical field of dynamic electric energy recovery braking, including: two sets of converters; data for obtaining current data on each power supply arm Collector; an energy storage device that realizes the storage or release of braking energy and completes two-way conduction of electric energy between two sets of converter devices; receives data from the data collector, analyzes and processes the data, and then controls the converter device, The control unit for the operation of the energy storage device; the converter device transforms and converts the traction power supply to obtain a 10kV power supply for the railway through power supply or self-closing power supply; the DC buses of the two converter devices are connected through the energy storage device. The invention realizes the flexible transfer of braking energy between the two traction arms, the remaining braking energy is temporarily stored in the energy storage device, and after the braking of the EMU, the energy in the energy storage device is gradually transferred to the Rail penetration or self-closing load release.

Description

technical field [0001] The invention belongs to the technical field of dynamic electric energy recovery braking, and in particular relates to an EMU braking energy adaptive recovery device and a recovery method. Background technique [0002] In the braking process of the new AC electric EMUs and electric locomotives, energy consumption braking and regenerative braking are adopted. During the braking process, a large amount of electric energy is generated and fed back to the traction grid, and then returned to the shared grid through the traction transformer. The following problems occurred during this process: [0003] 1. For the energy returned to the shared power grid, the method of reverse non-billing or reverse positive billing is adopted, causing economic losses to the railway company; [0004] 2. The returned current is an intermittent negative sequence current. This current is injected into the shared power grid, which is a disturbance to the shared power grid and in...

AI Technical Summary

Problems solved by technology

[0003] 1. The energy returned to the shared power grid is reversed without charging or reversed positive charging, causing economic losses to the railway company;

[0004] 2. The current sent back is intermittent negative sequence current, which is injected into the shared grid, which is a kind of interference to the shared grid and increases the risk of safe operation of the shared grid

But under normal circumstances, compared with the braking energy, the power of other electric loads is small, and the braking energy cannot be fully absorbed.

The braking energy has the characteristics of strong impact and large randomness of occurrence time, which makes it difficult to ensure the safe operation of other electric loads

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