CN112671041A - Direct-current voltage control method of rail transit bidirectional converter - Google Patents
Direct-current voltage control method of rail transit bidirectional converter Download PDFInfo
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- CN112671041A CN112671041A CN202110045973.7A CN202110045973A CN112671041A CN 112671041 A CN112671041 A CN 112671041A CN 202110045973 A CN202110045973 A CN 202110045973A CN 112671041 A CN112671041 A CN 112671041A
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Abstract
The invention relates to a direct-current voltage control method of a rail transit bidirectional converter device, and belongs to the technical field of rail transit power supply systems. The bidirectional converter comprises a bidirectional converter and a diode rectifier unit which are connected in parallel for operation, wherein when a line is unloaded, the bidirectional converter operates in a standby mode and has no power output to the outside; when the vehicle brakes, the voltage of the direct current bus rises, the bidirectional converter device is converted from standby to inversion voltage stabilization operation, the diode rectifier unit is cut off, and the bidirectional converter device feeds braking energy back to the alternating current power grid; when the vehicle runs in a traction mode, the voltage of a direct-current bus of the substation is reduced, the bidirectional converter device is switched from a standby mode to a traction rectification mode, and the bidirectional converter device and the diode rectifier set provide traction energy for the vehicle together. The invention has the beneficial effects that: constant voltage control is adopted in a double-inversion mode, so that the over-high voltage of a train network is avoided; and droop control is adopted in the rectification mode, and the bidirectional converter and the rectifier unit jointly output power to provide traction power required by the train, so that the over-low voltage of a train network is avoided.
Description
Technical Field
The invention relates to a direct-current voltage control method of a rail transit bidirectional converter device, and belongs to the technical field of rail transit power supply systems.
Background
The urban rail transit power supply system generally adopts a diode rectifier as a power supply of a train, the diode rectifier has the advantages of high efficiency, large capacity, strong overload capacity and the like, and meanwhile, the defects of uncontrollable output voltage, large ripple waves, incapability of performing regenerative braking energy absorption and utilization due to unidirectional energy flow and the like exist.
The bidirectional converter adopts a full-control IGBT device, has high working frequency and bidirectional converting capabilities of rectification and inversion, can realize the power supply function of train traction and can also realize the feedback utilization of the regenerative braking energy of the train.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a direct-current voltage control method of a rail transit bidirectional converter, which realizes the stable control of the voltage of a traction network by adjusting the external characteristics of the bidirectional converter.
The invention is realized by the following technical scheme: a direct-current voltage control method of a rail transit bidirectional converter device is characterized by comprising the following steps: the direct current side of the bidirectional converter and the direct current side of the diode rectifier unit are connected to a direct current bus through 1500V switch cabinets respectively, and the alternating current sides of the bidirectional converter and the diode rectifier unit are connected to a same 35kV bus through 35kV switch cabinets respectively;
when the line is unloaded, the bidirectional converter device operates in a standby mode and does not output power to the outside, and Udo is the no-load voltage of the diode rectifier unit;
when the vehicle brakes, the voltage of the direct current bus rises, the bidirectional converter device is converted from standby to inversion voltage stabilization operation, the starting threshold value of the inversion voltage stabilization operation is set to Uinv, the diode rectifier unit is cut off at the moment, and the bidirectional converter device feeds braking energy back to the alternating current power grid;
when the vehicle runs in a traction mode, the voltage of a direct-current bus of a substation is reduced, the bidirectional converter device is converted from standby to traction rectification running, and the bidirectional converter device and the diode rectifier set provide traction energy for the vehicle; setting the starting threshold value of traction rectification of the device to be Urec, and adjusting the power output of the bidirectional converter device and the diode rectifier unit by adjusting the slope of the external characteristic curve of the bidirectional converter device to realize the stable control of the network voltage.
Constant voltage control is adopted under the inversion voltage stabilization operation; the rectification operation adopts droop control, and the bidirectional converter and the rectifier unit jointly output power to provide traction power required by the train.
The invention has the beneficial effects that: constant voltage control is adopted in a double-inversion mode, so that the over-high voltage of a train network is avoided; and droop control is adopted in the rectification mode, and the bidirectional converter and the rectifier unit jointly output power to provide traction power required by the train, so that the over-low voltage of a train network is avoided.
Drawings
The invention is further illustrated below with reference to the figures and examples.
FIG. 1 is a schematic diagram of the parallel power scheme of the present invention;
fig. 2 is a schematic diagram of the dc voltage control method of the present invention.
Detailed Description
As shown in fig. 1, the method for controlling the dc voltage of the bidirectional converter for rail transit is characterized in that: the direct current side of the bidirectional converter and the direct current side of the diode rectifier unit are connected to a direct current bus through 1500V switch cabinets respectively, and the alternating current sides of the bidirectional converter and the diode rectifier unit are connected to a same 35kV bus through 35kV switch cabinets respectively;
as shown in fig. 2, when the line is unloaded, the bidirectional converter operates in a standby mode, no power is output to the outside, and Udo is the no-load voltage of the diode rectifier unit;
when the vehicle brakes, the voltage of the direct-current bus rises, the bidirectional converter device is converted from standby to inversion voltage stabilization operation, the starting threshold value of the inversion voltage stabilization operation is set to Uinv, the operation curve corresponds to a CBA section in the graph, at the moment, the diode rectifier unit is cut off, and the bidirectional converter device feeds braking energy back to the alternating-current power grid;
when the vehicle runs in a traction mode, the voltage of a direct-current bus of a substation is reduced, the bidirectional converter device is converted from standby to traction rectification running, and the bidirectional converter device and the diode rectifier set provide traction energy for the vehicle; setting the starting threshold value of traction rectification of the device as Urec, setting the traction operation curve corresponding to the CEF section in the graph, and adjusting the power output of the bidirectional converter and the diode rectifier unit by adjusting the slope of the external characteristic curve of the bidirectional converter to realize the stable control of the network voltage.
Constant voltage control is adopted under the inversion voltage stabilization operation; the rectification operation adopts droop control, and the bidirectional converter and the rectifier unit jointly output power to provide traction power required by the train.
Claims (2)
1. A direct-current voltage control method of a rail transit bidirectional converter device is characterized by comprising the following steps: the direct current side of the bidirectional converter and the direct current side of the diode rectifier unit are connected to a direct current bus through 1500V switch cabinets respectively, and the alternating current sides of the bidirectional converter and the diode rectifier unit are connected to a same 35kV bus through 35kV switch cabinets respectively;
when the line is unloaded, the bidirectional converter device operates in a standby mode and does not output power to the outside, and Udo is the no-load voltage of the diode rectifier unit;
when the vehicle brakes, the voltage of the direct current bus rises, the bidirectional converter device is converted from standby to inversion voltage stabilization operation, the starting threshold value of the inversion voltage stabilization operation is set to Uinv, the diode rectifier unit is cut off at the moment, and the bidirectional converter device feeds braking energy back to the alternating current power grid;
when the vehicle runs in a traction mode, the voltage of a direct-current bus of a substation is reduced, the bidirectional converter device is converted from standby to traction rectification running, and the bidirectional converter device and the diode rectifier set provide traction energy for the vehicle; setting the starting threshold value of traction rectification of the device to be Urec, and adjusting the power output of the bidirectional converter device and the diode rectifier unit by adjusting the slope of the external characteristic curve of the bidirectional converter device to realize the stable control of the network voltage.
2. The direct-current voltage control method of the rail transit bidirectional converter device according to claim 1, characterized in that: constant voltage control is adopted under the inversion voltage stabilization operation; the rectification operation adopts droop control, and the bidirectional converter and the rectifier unit jointly output power to provide traction power required by the train.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110045973.7A CN112671041A (en) | 2021-01-14 | 2021-01-14 | Direct-current voltage control method of rail transit bidirectional converter |
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| CN202110045973.7A CN112671041A (en) | 2021-01-14 | 2021-01-14 | Direct-current voltage control method of rail transit bidirectional converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500948A (en) * | 2021-07-15 | 2021-10-15 | 陈建明 | Low-emission safe and reliable rail transit system power supply method, equipment and system |
| CN113852063A (en) * | 2021-09-13 | 2021-12-28 | 中铁二院工程集团有限责任公司 | Distributed direct-current traction power supply system based on bidirectional converter |
| CN114123838A (en) * | 2021-12-02 | 2022-03-01 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
| CN114221333A (en) * | 2021-12-10 | 2022-03-22 | 江苏晨大电气股份有限公司 | Intelligent network voltage control method, device and system for rail transit bidirectional converter |
| CN115549196A (en) * | 2022-10-17 | 2022-12-30 | 重庆中车时代电气技术有限公司 | Intelligent urban rail traction power supply system and control method thereof |
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| CN112165126A (en) * | 2020-09-27 | 2021-01-01 | 新风光电子科技股份有限公司 | Self-adaptive control method for loop current suppression in parallel operation of bidirectional converters |
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2021
- 2021-01-14 CN CN202110045973.7A patent/CN112671041A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500948A (en) * | 2021-07-15 | 2021-10-15 | 陈建明 | Low-emission safe and reliable rail transit system power supply method, equipment and system |
| CN113852063A (en) * | 2021-09-13 | 2021-12-28 | 中铁二院工程集团有限责任公司 | Distributed direct-current traction power supply system based on bidirectional converter |
| CN114123838A (en) * | 2021-12-02 | 2022-03-01 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
| CN114123838B (en) * | 2021-12-02 | 2024-01-05 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
| CN114221333A (en) * | 2021-12-10 | 2022-03-22 | 江苏晨大电气股份有限公司 | Intelligent network voltage control method, device and system for rail transit bidirectional converter |
| CN115549196A (en) * | 2022-10-17 | 2022-12-30 | 重庆中车时代电气技术有限公司 | Intelligent urban rail traction power supply system and control method thereof |
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