Bidirectional traction converter, method for controlling output of bidirectional traction converter and urban rail train power supply system
A technology of bidirectional traction and converters, which is applied in the direction of converting AC power input into DC power output, output power conversion device, electric traction, etc., can solve the problems of increasing equipment cost and occupying an area of equipment, and achieve the goal of increasing equipment cost and The effect of equipment occupation
Pending Publication Date: 2021-12-07
BYD CO LTD
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Problems solved by technology
The difference in AC voltage between the two makes it unsuitable for the two converters to be connected to the same winding of the traction transformer, and independent transformers need to be set up for the two converters, thus increasing additional equipment cost and equipment footprint
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[0041] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present invention will be described in detail below.
[0042] figure 1 It is a schematic diagram of a three-level converter structure in the related art, figure 2 It is a schematic diagram of the hybrid use of bidirectional converters and diode rectifiers in the related art. In the related art, due to the different AC voltage level requirements of the three-level converter and the diode rectifier, it is necessary to set up an independent transformer, thus adding an additional Equipment cost and equipment footprint.
[0043] The embodiment of the present invention proposes a brand-new bidirectional traction converter structure, which can work under the condition that the voltage on the DC side is lower than the peak value of the voltage on the AC side, so it is suitable for co-winding...
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The invention provides a bidirectional traction converter, a method for controlling output of the bidirectional traction converter and an urban rail train power supply system. The bidirectional traction converter comprises a first capacitor, a second capacitor and a three-phase bridge arm unit; the positive electrode of the first capacitor is connected with the first terminal of each phase of bridge arm unit to serve as the positive electrode of a direct current bus, the third terminal of each phase of bridge arm unit is a three-phase alternating current bus, and the fourth terminal of each phase of bridge arm unit is connected with the positive electrode of the second capacitor after being connected; the negative electrode of the second capacitor is connected with the fifth terminal of each phase of bridge arm unit to serve as the negative electrode of the direct-current bus; the control unit is used for controlling the switching tube of each phase of bridge arm unit to be switched between switching states corresponding to different direct current output levels and different alternating current output levels, so that the bidirectional traction converter has different direct current side outputs and different alternating current side outputs, and is suitable for common winding work with step-down rectification topologies such as a diode rectifier and the like; and extra equipment cost and land occupation are not increased.
Description
technical field [0001] The invention relates to the technical field of urban rail trains, in particular to a bidirectional traction converter, a method for controlling the output of the bidirectional traction converter, and a power supply system for urban rail trains. Background technique [0002] At present, bidirectional traction converters used in urban rail transit are usually two-level or three-level converters. Since the rectification peak power is usually significantly higher than the inverter peak power in urban rail transit applications, it is usually necessary to set a higher power diode rectifier to meet the rectification peak power requirements. However, the AC voltage level of the diode rectifier does not match the AC voltage level of the bidirectional traction converter, for example, for a 1500V DC voltage level, the diode rectifier usually chooses an AC voltage of about 1180V, while the bidirectional traction converter usually chooses a maximum of about AC vo...
Claims
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IPC IPC(8): H02M7/219H02M7/483H02M7/5387B60L9/00
CPCH02M7/219H02M7/483H02M7/53871B60L9/00Y02T10/72
Inventor 杨文博
Owner BYD CO LTD