An energy-feedback type traction power supply device and its control method

Abstract

The invention discloses an energy feeding type dragging power supply device and a control method thereof. The energy feeding type dragging power supply device comprises a multiple transformer and at least two four-quadrant converter modules. The energy feeding type dragging power supply device and a diode rectification dragging unit are arranged in parallel form. A primary side of the multiple transformer of the energy feeding type dragging power supply device is connected to an alternated current medium-voltage power grid through a high-voltage switch cabinet; each set of windings at a low-voltage side of the multiple transformer is connected to an alternated current side of one four-quadrant converter module; and the direct current sides of the four-quadrant converter modules are in parallel connection after being connected to a direct current side isolation switch and are connected to a direct current bus through a direct current switch cabinet and a cathode cabinet. The energy feeding type dragging power supply device can work at three different modes of dragging, feedback or SVG (Scalable Vector Graphics) according to the requirements. The energy feeding type dragging power supply device is compatible with an existing dragging power supply system under the condition of meeting a power grid compatibility demand. The energy feeding type dragging power supply device has the advantages of moderate cost, capability of solving the technical problems of feeding back a regenerated braking energy and stabilizing a dragging network voltage, and real-time static reactive power compensation capacity.

Description

technical field [0001] The present invention relates to a power supply device and a control method for a power system, in particular to an energy feedback traction power supply device and a control method with traction, feedback and SVG functions, which are widely used in urban rail transit power supply systems, etc. similar power system. Background technique [0002] With the intensification of urbanization and the increase of population mobility, vigorously developing urban rail transit has become an important way to alleviate urban traffic congestion, improve urban people and the environment, and promote urban sustainable development. [0003] For many years, urban rail transit power supply systems have been using diode rectification technology to convert AC power to DC traction power. Especially after adopting 24-pulse rectification technology, the problem of harmonic compatibility with the power grid has been better resolved. Although this technology can better meet th...

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide an energy-feedback type traction power supply device and its control method. The device and its control method can be compatible with the existing traction power supply system and have moderate cost on the premise of meeting the grid compatibility requirements. Regenerative braking energy feedback and stable traction grid voltage technical issues, and real-time static reactive power compensation capability

Images