CN112803390A - Rectifier protection device for alternating current and direct current and control method thereof - Google Patents
Rectifier protection device for alternating current and direct current and control method thereof Download PDFInfo
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- CN112803390A CN112803390A CN202110006841.3A CN202110006841A CN112803390A CN 112803390 A CN112803390 A CN 112803390A CN 202110006841 A CN202110006841 A CN 202110006841A CN 112803390 A CN112803390 A CN 112803390A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/06—Two-wire systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
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Abstract
The invention relates to a rectifier protection device used in alternating current and direct current and a control mode thereof, wherein the rectifier protection device comprises a first rectifier and a second rectifier; a connecting switch is arranged between the first rectifier and the second rectifier; the output ends of the first rectifier and the second rectifier are connected with the positive bus and the negative bus, and a series or parallel connection mode is formed between the first rectifier and the second rectifier; when the first rectifier and the second rectifier are connected in parallel, the voltage difference between the positive bus and the negative bus is DC 750V; when the first rectifier and the second rectifier are connected in series, the voltage difference between the positive bus and the negative bus is DC 1500V. Its advantages are: the pressure difference requirement in the middle line is met; meanwhile, the positive bus is 375V by accessing the load resistance sharing assembly; the negative bus is-375V. The voltage is just matched with the working condition voltage in the monorail vehicle, and the safety is good.
Description
Technical Field
The invention relates to the technical field of rail vehicle power transmission, in particular to a rectifier protection device for alternating current and direct current and a control method thereof.
Background
In the field of rail vehicle power transmission, the bus voltage difference is usually 750V or 1500V, wherein the specific specification type is mainly realized by a rectifying protection device. However, the following drawbacks and disadvantages exist with respect to current commutation protection devices in rail vehicles:
firstly, in the existing railway vehicle routes, power is supplied in a direct current or alternating current mode, and regarding the lines which are supplied with alternating current and are also supplied with direct current, the traditional rectifier protection device cannot realize the power supply, and cannot realize the switching of the bus voltage difference at 750V or 1500V.
Secondly, in the rectifier protection device in the prior art, how to realize that the specific schemes of 750V or 1500V are different among the bus voltage differences are realized, the currently used three-phase voltage is usually 380V, and the potential safety hazard often occurs because some load voltages among the buses cannot be matched with the three-phase voltage in the prior art.
Chinese patent document CN201511022356.6, application date 20151230, with patent names: a wireless power supply system for a suspended monorail. The utility model discloses a suspension type monorail wireless power supply system, mainly include electric wire netting, high frequency inverter, three side segmentation distributed emitter, three side segmentation distributed receiving arrangement, rectification transformation device, locomotive load. The magnetic coupling resonance type wireless electric energy transmission technology is adopted, the segmented distributed transmitting devices positioned on three sides of the control suspension beam are switched to access the circuit according to the position of the electric locomotive, the three-side segmented distributed receiving devices corresponding to the segmented distributed transmitting devices on the locomotive are coupled with the transmitting devices to transmit electric energy, and the electric energy is further transmitted through the rectifying conversion device to provide power for the operation of the locomotive.
According to the suspension type monorail wireless power supply system disclosed by the patent document, the defect that the safety of contact power supply is poor is overcome by adopting a wireless power supply mode, loss in wireless power transmission is reduced by adopting a segmented power supply mode, and the efficiency is improved. The technology of three-side energy emission and three-side energy reception can be adopted to increase the transmission power and efficiency to the maximum extent depending on the actual conditions of the suspension type monorail. However, a technical scheme which can realize switching of bus differential pressure at 750V or 1500V and has good safety is not disclosed correspondingly.
In summary, there is a need for a rectifier protection device for ac/dc and a control method thereof, which can switch a bus voltage difference at 750V or 1500V and has good safety. However, no report is found about the protection device for the AC/DC rectifier and the control method thereof.
Disclosure of Invention
The invention aims to provide a rectifier protection device for alternating current and direct current, which can realize the switching of bus voltage difference at 750V or 1500V and has good safety.
In order to achieve the purpose, the invention adopts the technical scheme that:
yet another object of the present invention is: a control method for a rectifier protection device in alternating current and direct current.
A rectifier protection device used in alternating current and direct current comprises a first rectifier and a second rectifier; a connecting switch is arranged between the first rectifier and the second rectifier; the output ends of the first rectifier and the second rectifier are connected with the positive bus and the negative bus, and a series or parallel connection mode is formed between the first rectifier and the second rectifier; when the first rectifier and the second rectifier are connected in parallel, the voltage difference between the positive bus and the negative bus is DC 750V; when the first rectifier and the second rectifier are connected in series, the voltage difference between the positive bus and the negative bus is DC 1500V.
As a preferred technical solution, the input end of the first rectifier is connected with a first rectifier transformer; the output end of the first rectifier is provided with two output cables, wherein one output cable is provided with a first isolating switch and is connected with the negative bus; the other output cable is provided with a first breaker and is connected with the positive bus.
As a preferred technical solution, a first protection resistor and a second protection resistor are arranged on two sides of the first rectifier; the first protection resistor and the second protection resistor are both provided with an over-current protection switch and an over-current protection cabinet.
As a preferable technical scheme, the output end of the second rectifier has two output cables, wherein one output cable is provided with a second isolating switch and is connected with the negative bus; and the other output cable is provided with a second breaker and is connected with the positive bus.
As a preferred technical solution, a third protection resistor and a fourth protection resistor are arranged on two sides of the second rectifier; and the third protection resistor and the fourth protection resistor are both provided with an over-current protection switch and an over-current protection cabinet.
As a preferable technical solution, when the first rectifier and the second rectifier are connected in series, the connection switch is closed, the first disconnector is closed, the first breaker is open, the second disconnector is open, and the second breaker is closed.
As a preferable technical solution, when the first rectifier and the second rectifier are connected in parallel, the connection switch is opened, the first disconnector is closed, the first breaker is closed, the second disconnector is closed, and the second breaker is closed.
As a preferred technical solution, the rectifier protection device is further provided with a load sharing resistor component; the load sharing resistor component comprises a first load resistor, a second load resistor, a first load switch, a second load switch and a third load switch, and when the first rectifier and the second rectifier are connected in parallel, the first load switch is closed and the second load switch is opened; when the third load switches are all closed, the positive bus is 375V; the negative bus is-375V.
In order to achieve the second object, the invention adopts the technical scheme that:
a control method using the rectifier protection device for alternating current and direct current according to any one of the above embodiments; when the voltage difference between the positive bus and the negative bus is DC1500V, the first disconnecting switch is closed, the connecting switch is closed, the first circuit breaker is opened, the second disconnecting switch is opened, and the second circuit breaker is closed; when the voltage difference between the positive bus and the negative bus is DC750V, the first disconnector is closed, the connecting switch is open, the first circuit breaker is closed, the second disconnector is closed, and the second circuit breaker is closed.
As a preferred technical solution, when the first rectifier and the second rectifier are connected in parallel, neither the positive bus nor the negative bus is grounded, and there is no reference potential to ground, and at this time, the first load switch is closed, and the second load switch is opened; then the third load switch is closed, and the connection point of the first load resistor and the second load resistor is 0V; the positive bus is 375V; the negative bus is-375V.
The invention has the advantages that:
according to the rectifier protection device used in alternating current and direct current and the control method thereof, the bus differential pressure can be switched between 750V or 1500V by changing the connection mode of the rectifier and controlling through the corresponding switch, so that the differential pressure requirement in a middle line is met; meanwhile, the positive bus is 375V by accessing the load resistance sharing assembly; the negative bus is-375V. The voltage is just matched with the working condition voltage in the monorail vehicle, and the safety is good.
Drawings
FIG. 1 is a schematic structural diagram of a rectifier protection device for AC/DC power supply according to the present invention;
fig. 2 is a schematic structural diagram of a load sharing resistor component in the rectifier protection device of the present invention;
fig. 3 is a flow chart of a control method of the rectifier protection device used in alternating current and direct current of the invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
The reference numerals and components referred to in the drawings are as follows:
example 1
1. First rectifier 11 first rectifier transformer
12. First disconnecting switch 13, first circuit breaker
14. First protection resistor 15, second protection resistor
2. Second rectifier 21. second rectifier transformer
22. Second disconnecting switch 23, second circuit breaker
24. Third protective resistor 25, fourth protective resistor
3. Load sharing resistor assembly 31. first load switch
32. Second load switch 33, third load switch
34. First load resistor 35, second load resistor
4. Connecting switch 5. positive bus
6. Negative bus
Referring to fig. 1, fig. 1 is a schematic structural diagram of a rectifier protection device for ac/dc according to the present invention. A rectifier protection device used in alternating current and direct current; the rectifier protection device comprises a first rectifier 1 and a second rectifier 2; a connecting switch 4 is arranged between the first rectifier 1 and the second rectifier 2; the output ends of the first rectifier 1 and the second rectifier 2 are connected with the positive bus 5 and the negative bus 6, and a series or parallel connection mode is formed between the first rectifier 1 and the second rectifier 2; when the first rectifier 1 and the second rectifier 2 are connected in parallel, the voltage difference between the positive bus 5 and the negative bus 6 is 750V; when the first rectifier 1 and the second rectifier 2 are connected in series, the voltage difference between the positive bus bar 5 and the negative bus bar 6 is 1500V.
The input end of the first rectifier 1 is connected with a first rectifier transformer 11; the output end of the first rectifier 1 has two output cables, wherein one output cable is provided with a first isolating switch 12 and is connected with the negative bus 6; the other output cable is provided with a first breaker 13 and is connected with the positive bus 5;
a first protection resistor 14 and a second protection resistor 15 are arranged on two sides of the first rectifier 1; the first protection resistor 14 and the second protection resistor 15 are both provided with an overcurrent protection switch and an overcurrent protection cabinet.
The output end of the second rectifier 2 has two output cables, wherein one output cable is provided with a second isolating switch 22 and is connected with the negative bus 6; the other output cable is provided with a second breaker 23 and is connected with the positive bus 5;
a third protective resistor 24 and a fourth protective resistor 24 are arranged on two sides of the second rectifier 2; the third protection resistor 24 and the fourth protection resistor 25 are both provided with an overcurrent protection switch and an overcurrent protection cabinet.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a load sharing resistor component 3 in the rectifier protection device of the present invention. The rectifier protection device is also provided with a load sharing resistance component 3; the load sharing resistor component 3 comprises a first load resistor 34, a second load resistor 35, a first load switch 31, a second load switch 32 and a third load switch 33; when the first rectifier 1 and the second rectifier 2 are connected in series, the first load switch 31 is closed, and the second load switch 32 is opened; the third load switches 33 are all closed, the positive bus 5 is 375V and the negative bus 6 is-375V.
The embodiment needs to be explained as follows:
the rectifier protection device comprises a first rectifier 1 and a second rectifier 2; a connecting switch 4 is arranged between the first rectifier 1 and the second rectifier 2; the output ends of the first rectifier 1 and the second rectifier 2 are connected with the positive bus 5 and the negative bus 6, and a series or parallel connection mode is formed between the first rectifier 1 and the second rectifier 2. The effect of this design is: firstly, two rectifiers are arranged for converting alternating current into direct current, and the two rectifiers are provided with two voltage input points, so that the working condition requirements of a single-rail vehicle are met; and secondly, the two rectifiers are connected in series and in parallel, so that the voltage difference between the positive bus 5 and the negative bus 6 can be switched between 750V and 1500V, and the requirement of using an alternating current power supply line and a direct current power supply line is met.
The input end of the first rectifier 1 is connected with a first rectifier transformer 11; the output end of the first rectifier 1 has two output cables, wherein one output cable is provided with a first isolating switch 12 and is connected with the negative bus 6; the other output cable is provided with a first breaker 13 and establishes a connection with the positive bus bar 5. The first rectifier transformer 11 is used for effectively reducing voltage when converting between alternating current and direct current; and secondly, the first circuit breaker 13 on the output cable has the function of protecting the circuit and effectively prevents the high-voltage from breaking down. The functions of the second rectifier transformer 21 and the second breaker 23 are the same as those of the first rectifier 1 and the first breaker 13, respectively, and are not described again here.
A first protection resistor 14 and a second protection resistor 15 are arranged on two sides of the first rectifier 1; the first protection resistor 14 and the second protection resistor 15 are both provided with an overcurrent protection switch and an overcurrent protection cabinet. The first protection resistor 14 and the second protection resistor 15 are arranged to mainly protect the first rectifier 1, and the rectifier can be protected from being grounded through the protection resistors when the first rectifier 1 is in a high-voltage environment. Similarly, the third protection resistor 24 and the fourth protection resistor 25 both function to ground-protect the rectifier.
When the first rectifier 1 and the second rectifier 2 are connected in series, the connecting switch 4 is closed, the first disconnecting switch 12 is closed, the first circuit breaker 13 is opened, the second disconnecting switch 22 is opened, and the second circuit breaker 23 is closed. The effect of this design is: design benefit through control switch's mode, realizes forming the series connection between first rectifier 1 and the second rectifier 2, and stability is good, can carry out automatic switch between each switch, need not manual switch, and the switching is quick and accurate.
When the first rectifier 1 and the second rectifier 2 are connected in parallel, the connecting switch 4 is opened, the first disconnecting switch 12 is closed, the first circuit breaker 13 is closed, the second disconnecting switch 22 is closed, and the second circuit breaker 23 is closed. The effect of this design is: the operation is simple, the parallel connection can be realized only by opening and closing the switches, and a complex circuit structure is not required to be introduced.
The rectifier protection device is also provided with a load sharing resistance component 3; the load sharing resistor component 3 includes a first load resistor 34, a second load resistor 35, a first load switch 31, a second load switch 32 and a third load switch 33, and when the first rectifier 1 and the second rectifier 2 are connected in parallel, the first load switch 31 is closed and the second load switch 32 is opened; when the third load switches 33 are all closed, the positive bus 5 is 375V; the negative bus 6 is-375V. The effect of this design is: because the first rectifier 1 and the second rectifier 2 are connected in parallel, the bus differential pressure is 750V; the load voltages of the buses can be matched with the three-phase voltage, and the safety is good.
Example 2
Referring to fig. 3, fig. 3 is a flow chart of a control method of the rectifier protection device for ac/dc according to the present invention. A control mode of a rectifier protection device used in alternating current and direct current; when the voltage difference between the positive bus 5 and the negative bus 6 is DC1500V, the first disconnector 12 is closed, the connecting switch 4 is closed, the first circuit breaker 13 is open, the second disconnector 22 is open, and the second circuit breaker 23 is closed; when the voltage difference between positive bus 5 and negative bus 6 is DC750V, first disconnector 12 is closed, connecting switch 4 is open, first disconnector 13 is closed, second disconnector 22 is closed, and second disconnector 23 is closed.
When the first rectifier 1 and the second rectifier 2 are connected in parallel, the positive bus 5 and the negative bus 6 are not grounded, and have no reference potential to the ground, and at this time, the first load switch 31 is closed, and the second load switch 32 is opened; then, when the third load switch 33 is turned on, the connection point of the first load resistor 34 and the second load resistor 35 is 0V; the positive bus 5 is 375V; the negative bus 6 is-375V.
The embodiment needs to be explained as follows:
and the connection relation between the first rectifier 1 and the second rectifier 2 is controlled in turn according to the voltage difference between the positive bus bar and the negative bus bar 6, so that matched voltage is output in alternating current and direct current power supply. In the conventional scheme, once the voltage difference between the positive bus 5 and the negative bus 6 is determined, the output voltage value of the corresponding rectifier protection device is also determined, and the rectifier protection device is not suitable for application environments requiring different voltage differences in one line.
Secondly, in the whole rectifier protection device, a load resistance sharing assembly is connected between the positive bus 5 and the negative bus 6, and the positive bus 5 is 375V under the control of a corresponding switch; the negative bus 6 is-375V. The voltage is just matched with the working condition voltage in the monorail vehicle, and the safety is good.
According to the rectifier protection device used in alternating current and direct current and the control method thereof, the bus differential pressure can be switched between 750V or 1500V by changing the connection mode of the rectifier and controlling through the corresponding switch, so that the differential pressure requirement in a middle line is met; meanwhile, the positive bus 5 is 375V by accessing the load resistance sharing assembly; the negative bus 6 is-375V. The voltage is just matched with the working condition voltage in the monorail vehicle, and the safety is good.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A rectifier protection device used in alternating current and direct current is characterized in that the rectifier protection device comprises a first rectifier and a second rectifier; a connecting switch is arranged between the first rectifier and the second rectifier; the output ends of the first rectifier and the second rectifier are connected with the positive bus and the negative bus, and a series or parallel connection mode is formed between the first rectifier and the second rectifier; when the first rectifier and the second rectifier are connected in parallel, the voltage difference between the positive bus and the negative bus is DC 750V; when the first rectifier and the second rectifier are connected in series, the voltage difference between the positive bus and the negative bus is DC 1500V.
2. The protection device for the AC/DC rectifier of claim 1, wherein a first rectifier transformer is connected to an input end of the first rectifier; the output end of the first rectifier is provided with two output cables, wherein one output cable is provided with a first isolating switch and is connected with the negative bus; the other output cable is provided with a first breaker and is connected with the positive bus.
3. The protection device for the rectifier used in alternating current and direct current according to claim 2, characterized in that a first protection resistor and a second protection resistor are arranged on two sides of the first rectifier; the first protection resistor and the second protection resistor are both provided with an over-current protection switch and an over-current protection cabinet.
4. The protection device for the rectifier used in alternating current and direct current according to claim 3, characterized in that the output end of the second rectifier has two output cables, wherein one output cable is provided with a second isolating switch and is connected with the negative bus; and the other output cable is provided with a second breaker and is connected with the positive bus.
5. The protection device for the AC/DC rectifier of claim 4, wherein a third protection resistor and a fourth protection resistor are arranged on two sides of the second rectifier; and the third protection resistor and the fourth protection resistor are both provided with an over-current protection switch and an over-current protection cabinet.
6. The device as claimed in claim 1, wherein the first rectifier and the second rectifier are connected in series, the connecting switch is closed, the first disconnecting switch is closed, the first breaker is open, the second disconnecting switch is open, and the second breaker is closed.
7. The device as claimed in claim 1, wherein when the first and second rectifiers are connected in parallel, the connecting switch is open, the first disconnector is closed, the first breaker is closed, the second disconnector is closed, and the second breaker is closed.
8. The device as claimed in claim 1, wherein a load sharing resistor assembly is further disposed in the rectifier protection device; the load sharing resistor component comprises a first load resistor, a second load resistor, a first load switch, a second load switch and a third load switch, and when the first rectifier and the second rectifier are connected in parallel, the first load switch is closed and the second load switch is opened; when the third load switches are all closed, the positive bus is 375V; the negative bus is-375V.
9. A control mode using the rectifier protection device for alternating current and direct current according to any one of claims 1 to 8; when the voltage difference between the positive bus and the negative bus is DC1500V, the first disconnecting switch is closed, the connecting switch is closed, the first circuit breaker is opened, the second disconnecting switch is opened, and the second circuit breaker is closed; when the voltage difference between the positive bus and the negative bus is DC750V, the first disconnector is closed, the connecting switch is open, the first circuit breaker is closed, the second disconnector is closed, and the second circuit breaker is closed.
10. A control scheme using claim 9 wherein when the first rectifier and the second rectifier are connected in parallel, neither the positive nor the negative bus is connected to ground, and there is no reference potential to ground, and the first load switch is closed and the second load switch is open; then the third load switch is closed, and the connection point of the first load resistor and the second load resistor is 0V; the positive bus is 375V; the negative bus is-375V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110006841.3A CN112803390A (en) | 2021-01-05 | 2021-01-05 | Rectifier protection device for alternating current and direct current and control method thereof |
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| CN202110006841.3A CN112803390A (en) | 2021-01-05 | 2021-01-05 | Rectifier protection device for alternating current and direct current and control method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209096531U (en) * | 2018-11-01 | 2019-07-12 | 中铁第五勘察设计院集团有限公司 | A kind of urban track traffic tractive power supply system |
| US10680533B1 (en) * | 2019-02-01 | 2020-06-09 | Hamilton Sunstrand Corporation | Common layout rectifier or converter |
| CN211508617U (en) * | 2019-12-27 | 2020-09-15 | 中铁第五勘察设计院集团有限公司 | Multi-standard urban rail transit traction power supply conversion circuit |
| CN113014078A (en) * | 2021-04-21 | 2021-06-22 | 重庆中车长客轨道车辆有限公司 | Energy absorption method for a rail vehicle |
-
2021
- 2021-01-05 CN CN202110006841.3A patent/CN112803390A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209096531U (en) * | 2018-11-01 | 2019-07-12 | 中铁第五勘察设计院集团有限公司 | A kind of urban track traffic tractive power supply system |
| US10680533B1 (en) * | 2019-02-01 | 2020-06-09 | Hamilton Sunstrand Corporation | Common layout rectifier or converter |
| CN211508617U (en) * | 2019-12-27 | 2020-09-15 | 中铁第五勘察设计院集团有限公司 | Multi-standard urban rail transit traction power supply conversion circuit |
| CN113014078A (en) * | 2021-04-21 | 2021-06-22 | 重庆中车长客轨道车辆有限公司 | Energy absorption method for a rail vehicle |
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Application publication date: 20210514 |