CN106877314B - Multi-power electronic transformer traction power supply system with low-voltage side sharing direct current bus - Google Patents
Multi-power electronic transformer traction power supply system with low-voltage side sharing direct current bus Download PDFInfo
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- CN106877314B CN106877314B CN201710141634.2A CN201710141634A CN106877314B CN 106877314 B CN106877314 B CN 106877314B CN 201710141634 A CN201710141634 A CN 201710141634A CN 106877314 B CN106877314 B CN 106877314B
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- 238000004146 energy storage Methods 0.000 claims description 14
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- 230000010363 phase shift Effects 0.000 claims description 2
- 230000003137 locomotive effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The application discloses a multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus, which comprises a plurality of power electronic transformers connected in parallel on a high-voltage alternating current bus, wherein the low-voltage direct current sides output by the power electronic transformers are connected in parallel to form the low-voltage direct current bus, and the low-voltage direct current bus is connected with a traction inverter for supplying power to a motor. In the application, a plurality of power electronic transformers are connected with a low-voltage direct-current bus in parallel, and when a pantograph of one power electronic transformer is offline, other power electronic transformers can still supply power to a motor.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus.
Background
At present, china is the country with the largest rule and the highest development speed of the high-speed railway in the world. According to international railroad alliance (UIC) statistics, by 12 months of 2016, chinese midcar products have been exported to 102 countries and regions in six continents worldwide, covering 83% of countries and regions with railways worldwide.
As shown in fig. 1, the traction transformer is a power source and an important component of an electric locomotive transmission system, when power is supplied, a pantograph 3 and a traction transformer 6 are connected between an alternating current traction network 1 and a rail 2, and the traction transformer 6 is connected with a traction motor 5 through a main converter 4.
The traction transformer 6 is bulky and heavy, occupies a large riding space, and additionally consumes a large amount of energy. The PETT of the new generation of electric power electronic traction transformer is shown in fig. 2, the high voltage alternating current side 7 is connected to an alternating current traction network, the output side of the new generation of electric power electronic traction transformer is the low voltage direct current side 8, and the PETT not only has the functions of electric isolation, bidirectional power transmission and voltage conversion of the traditional power frequency traction transformer, but also has the advantages of weight and volume reduction of more than 50%, high power factor, low harmonic content, small pollution and the like, and is highly valued by the theoretical and technical research of the international track traffic field.
The world famous locomotive manufacturers sequentially make design schemes and test prototypes for the PETT, but researches on a multi-power electronic transformer traction power supply system are still fresh and reported, and the research on the multi-power electronic transformer traction power supply system becomes a strategic high place of a new generation of international lightweight high-performance electric locomotives.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus.
A multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus comprises a plurality of power electronic transformers connected in parallel on a high-voltage alternating current bus, wherein the low-voltage direct current sides output by the power electronic transformers are connected in parallel to form the low-voltage direct current bus, and the low-voltage direct current bus is connected with a traction inverter for supplying power to a motor.
Furthermore, the low-voltage direct current bus is connected with the hybrid energy storage system, and the low-voltage direct current bus is connected with the hybrid energy storage device, so that energy can be supplied in a short time when the bow net is offline, and energy generated by feedback braking can be absorbed, and harmonic waves injected into the traction net by the power electronic transformer can be reduced.
Further, the power electronic transformers are all connected behind a pantograph connected with a high-voltage alternating current bus.
Further, the number of the traction inverters is multiple, the traction inverters are all connected in parallel to the low-voltage direct-current bus, and each traction inverter supplies power to a corresponding motor.
Further, the hybrid energy storage system is composed of a storage battery and a super capacitor.
Further, a resistor for realizing soft start of the power electronic transformer is connected in parallel at the switch on the pantograph.
Further, a filter is connected in series between the pantograph and the power electronic transformer, when the energy of the feedback brake is large, the power electronic transformer transmits the energy to the traction network, and the filter is used for filtering the feeding current at the moment.
Further, the front-stage rectifying link of the power electronic transformer adopts a cascade H-bridge structure, the DC side of each H-bridge is connected with a DC-DC converter, a plurality of DC-DC converters are connected in parallel, positive electrode circuits output by the DC-DC converters are respectively connected, negative electrode circuits output by the DC-DC converters are respectively connected, and the low-voltage DC sides output by the power electronic transformers are connected in parallel to form a low-voltage DC bus.
Furthermore, the rectifying link of the power electronic traction transformer adopts SPWM (sinusoidal pulse width modulation), the direct current sides of the H bridges are connected with capacitors in parallel, the rear sides of the H bridges are connected with a resonant converter, the resonant converter consists of two H bridges, the resonant capacitors, a resonant inductor and a high-frequency transformer, the resonant converter adopts phase shift control, and the output ends of the resonant converter are connected in parallel to form the low-voltage direct current output end of the power electronic transformer.
Further, the filter is an L filter circuit.
Further, the DC-DC converter is a resonant converter.
Compared with the prior art, the application has the beneficial effects that:
(1) A resistor is connected in parallel at the switch on the pantograph, so that soft start of the locomotive power electronic transformer can be realized, and impact on the power electronic transformer during start is reduced.
(2) The DC-DC link of the power electronic transformer adopts the high-frequency resonant converter, so that the volume of the transformer can be reduced, and the switching loss can be reduced.
(3) In the application, a plurality of power electronic transformers are connected with a low-voltage direct-current bus in parallel, and when a pantograph of one power electronic transformer is offline, other power electronic transformers can still supply power to a motor.
(4) The low-voltage direct-current bus is connected with the hybrid energy storage device, so that energy can be supplied in a short time when the bow net is offline.
(5) The low-voltage direct-current bus is connected with the hybrid energy storage device, so that energy generated by feedback braking can be absorbed, and the harmonic wave injected into the traction network by the power electronic transformer is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a block diagram of a conventional traction power supply system;
FIG. 2 is a block diagram of a power electronic transformer;
FIG. 3 is a block diagram of a multiple power electronic transformer traction power supply system;
the traction system comprises a traction network 1, a traction network 2, rails, 3, a pantograph, 4, a main converter, 5, a traction motor, 6, a traction transformer, 7, a high-voltage alternating-current side, 8, a low-voltage direct-current side, 9 and a low-voltage direct-current bus.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the defects of large influence of the off-line bow net on the traction system, large harmonic waves injected into the power grid during the feedback braking of the locomotive and the like exist in the prior art.
In an exemplary embodiment of the present application, a multi-power electronic transformer traction power supply system of a low-voltage side common dc bus is provided, as shown in fig. 3, wherein a dashed box represents a train of electric locomotives, and a PETT structure is shown in fig. 2. According to the application, a plurality of PETTs are connected behind the pantograph to convert high-voltage alternating current into low-voltage direct current, and then the low-voltage direct current bus 9 supplies power to each motor, and a plurality of traction inverters are all connected in parallel on the low-voltage direct current bus.
The application is characterized in that a hybrid energy storage system consisting of a storage battery and a super capacitor is connected to a low-voltage direct-current bus, and the hybrid energy storage system consisting of the storage battery and the super capacitor is connected to the low-voltage direct-current bus for two purposes: 1) Because a small amount of energy is fed back into the traction network in the feedback braking process, the feedback current contains larger harmonic components, and the connected hybrid energy storage system can absorb the partial feedback energy, so that the harmonic content in the traction network is reduced; 2) When the pantograph goes offline due to vibration and excessive equality, the hybrid energy storage device can provide a function for the electric locomotive in a short time, and adverse effects of the offline pantograph network on the power electronic transformer are reduced.
In addition, the switch on the pantograph is connected with a resistor in parallel, so that the soft start of the locomotive power electronic transformer can be realized; and a filter is connected in series between the pantograph and the power electronic transformer, when the energy of the feedback brake is large, the power electronic transformer transmits the energy to the traction network, and the filter is used for filtering the feeding current at the moment. Preferably, the filter is an L-filter circuit.
As shown in fig. 2, the front-stage rectification link of the power electronic transformer adopts a cascade H-bridge structure, the direct current side of each H-bridge is connected with a DC-DC converter, a plurality of DC-DC converters are connected in parallel, the positive electrode lines of the outputs of the DC-DC converters are respectively connected, and the negative electrode lines of the outputs are respectively connected; the low-voltage direct current sides of the output of the power electronic transformers are connected in parallel to form a low-voltage direct current bus 9; a traction inverter is connected to the low-voltage direct current bus 9 to supply power to the motor; the low-voltage direct current bus 9 is connected with a hybrid energy storage system. The DC-DC converter is a resonant converter.
Working principle: according to the application, a plurality of PETTs are connected behind the pantograph to convert high-voltage alternating current into low-voltage direct current, and then a low-voltage direct current bus is used for supplying power to each motor, a plurality of traction inverters are all connected in parallel on the low-voltage direct current bus, and a hybrid energy storage system consisting of a storage battery and a super capacitor is connected on the low-voltage direct current bus. Wherein: the electric electronic traction transformer is shown in fig. 2, the rectifying link of the electric electronic traction transformer consists of cascade H-bridges, and SPWM modulation is adopted; the direct current sides of the H bridges are connected with capacitors in parallel, the rear sides of the H bridges are connected with a resonant converter, the resonant converter consists of two H bridges, a resonant capacitor, a resonant inductor and a high-frequency transformer, and the resonant converter is controlled by phase shifting; the output ends of the resonant converters are connected in parallel to form a low-voltage direct-current output end of the power electronic transformer; the low-voltage direct current output ends of the power electronic transformers are connected to one bus to form a low-voltage direct current bus.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. The multi-power electronic transformer traction power supply system of the low-voltage side common direct current bus is characterized by comprising a plurality of power electronic transformers connected in parallel on a high-voltage alternating current bus, wherein the low-voltage direct current sides output by the power electronic transformers are connected in parallel to form a low-voltage direct current bus, and the low-voltage direct current bus is connected with a traction inverter for supplying power to a motor;
the low-voltage direct-current bus is connected with a hybrid energy storage system; the hybrid energy storage system can be used for supplying energy to the motor in a short time when the bow net is offline, and can be used for absorbing energy generated by feedback braking and reducing harmonic waves injected into the traction net by the power electronic transformer;
the power electronic transformers are all connected behind a pantograph connected with the high-voltage alternating current bus; and a resistor for realizing soft start of the power electronic transformer is connected in parallel at the switch on the pantograph.
2. The multi-power electronic transformer traction power supply system of the low-voltage side common direct current bus according to claim 1, wherein the number of the traction inverters is plural, the plurality of traction inverters are all connected in parallel on the low-voltage direct current bus, and each traction inverter supplies power to a corresponding motor.
3. The multi-power electronic transformer traction power supply system of the low-voltage side common direct current bus according to claim 1, wherein the hybrid energy storage system consists of a storage battery and a super capacitor.
4. A multi-power electronic transformer traction power supply system for a low-side common dc bus as claimed in claim 1, wherein a filter is connected in series between the pantograph and the power electronic transformer, the power electronic transformer transmitting energy to the traction network when the energy of the feedback brake is large, the filter being adapted to filter the current fed at that time.
5. The multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus as claimed in claim 1, wherein a cascade H-bridge structure is adopted in a front-stage rectifying link of the power electronic transformer, a DC-DC converter is connected to a direct current side of each H-bridge, a plurality of DC-DC converters are connected in parallel, positive electrode lines of outputs of the plurality of DC-DC converters are respectively connected, negative electrode lines of the outputs are respectively connected, the low-voltage direct current sides of the outputs of the plurality of power electronic transformers are connected in parallel to form the low-voltage direct current bus, and the DC-DC converter is a resonant converter.
6. The multi-power electronic transformer traction power supply system of a low-voltage side common direct current bus as claimed in claim 1, wherein the rectifying link of the power electronic traction transformer adopts SPWM modulation, the direct current sides of the H bridges are all connected with capacitors in parallel, the rear side of the H bridges is connected with a resonant converter, the resonant converter consists of two H bridges, resonant capacitors, resonant inductors and a high-frequency transformer, the resonant converter adopts phase shift control, and the output ends of the resonant converter are connected in parallel to form the low-voltage direct current output end of the power electronic transformer.
7. The multi-power electronic transformer traction power supply system of the low-voltage side common direct current bus as claimed in claim 4, wherein the filter is an L-filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710141634.2A CN106877314B (en) | 2017-03-10 | 2017-03-10 | Multi-power electronic transformer traction power supply system with low-voltage side sharing direct current bus |
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| CN201710141634.2A CN106877314B (en) | 2017-03-10 | 2017-03-10 | Multi-power electronic transformer traction power supply system with low-voltage side sharing direct current bus |
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| CN106877314B true CN106877314B (en) | 2023-11-21 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08308295A (en) * | 1995-05-02 | 1996-11-22 | Mitsubishi Electric Corp | Main circuit device for pumped-storage power station |
| RU99394U1 (en) * | 2010-06-17 | 2010-11-20 | Открытое Акционерное Общество "Российские Железные Дороги" | AC ELECTRIC POWER SUPPLY SYSTEM |
| CN101917011A (en) * | 2010-09-06 | 2010-12-15 | 东南大学 | Power quality comprehensive control method and device for electric railway traction power supply system |
| CN104935168A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Multifunctional transformer used for traction transmission system |
| CN205105119U (en) * | 2015-10-28 | 2016-03-23 | 宁波市轨道交通集团有限公司 | City rail power supply system twin coil inserts wherein pressure energy system of presenting |
| CN205489522U (en) * | 2015-11-19 | 2016-08-17 | 中国石油化工股份有限公司 | Beam -pumping unit direct current distribution system |
| CN105932720A (en) * | 2016-03-23 | 2016-09-07 | 国家电网公司 | High-voltage high-capacity energy storage virtual synchronous machine system |
| CN105978370A (en) * | 2016-05-26 | 2016-09-28 | 全球能源互联网研究院 | Sine power transmission method for improving electric power electronic transformer power density |
| CN206564465U (en) * | 2017-03-10 | 2017-10-17 | 山东大学 | A kind of many electric power electric transformer tractive power supply systems of low-pressure side common DC bus |
-
2017
- 2017-03-10 CN CN201710141634.2A patent/CN106877314B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08308295A (en) * | 1995-05-02 | 1996-11-22 | Mitsubishi Electric Corp | Main circuit device for pumped-storage power station |
| RU99394U1 (en) * | 2010-06-17 | 2010-11-20 | Открытое Акционерное Общество "Российские Железные Дороги" | AC ELECTRIC POWER SUPPLY SYSTEM |
| CN101917011A (en) * | 2010-09-06 | 2010-12-15 | 东南大学 | Power quality comprehensive control method and device for electric railway traction power supply system |
| CN104935168A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Multifunctional transformer used for traction transmission system |
| CN205105119U (en) * | 2015-10-28 | 2016-03-23 | 宁波市轨道交通集团有限公司 | City rail power supply system twin coil inserts wherein pressure energy system of presenting |
| CN205489522U (en) * | 2015-11-19 | 2016-08-17 | 中国石油化工股份有限公司 | Beam -pumping unit direct current distribution system |
| CN105932720A (en) * | 2016-03-23 | 2016-09-07 | 国家电网公司 | High-voltage high-capacity energy storage virtual synchronous machine system |
| CN105978370A (en) * | 2016-05-26 | 2016-09-28 | 全球能源互联网研究院 | Sine power transmission method for improving electric power electronic transformer power density |
| CN206564465U (en) * | 2017-03-10 | 2017-10-17 | 山东大学 | A kind of many electric power electric transformer tractive power supply systems of low-pressure side common DC bus |
Non-Patent Citations (1)
| Title |
|---|
| 基于降阶电感矩阵法的多流制牵引主变压器直流滤波电感的计算;许加柱;祁琦;李知宇;黄登威;李高龙;中国电机工程学报;第35卷(第15期);全文 * |
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