CN107171537B - Bypass control system of power unit and high-voltage variable-frequency speed regulation device - Google Patents
Bypass control system of power unit and high-voltage variable-frequency speed regulation device Download PDFInfo
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- CN107171537B CN107171537B CN201710517538.3A CN201710517538A CN107171537B CN 107171537 B CN107171537 B CN 107171537B CN 201710517538 A CN201710517538 A CN 201710517538A CN 107171537 B CN107171537 B CN 107171537B
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- unit
- power
- contactor
- control signal
- control system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Abstract
The invention relates to the technical field of storage power electronics, in particular to a bypass control system of a power unit, which comprises the following components: a plurality of power cells operating in series; a control unit; a plurality of driving units; a plurality of contactors; the control unit outputs a control signal to the control signal distribution unit when detecting that any power unit fails; the control signal distribution unit outputs a distribution control signal to a driving unit for driving a contactor connected with the power unit with the fault according to the control signal; the driving unit which receives the distribution control signal drives the contact of the contactor to be closed so as to short-circuit the power unit which has faults; the contactor feeds back a state signal reflecting the state of the contactor to the control unit; the control unit judges whether the contactor acts according to the state signal; the power unit can be reliably short-circuited or isolated, the reliability is high, and the implementation is easy.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a bypass control system of a power unit and a high-voltage variable-frequency speed regulating device.
Background
The high-voltage variable-frequency speed regulating device is increasingly widely applied in the fields of electric power, metallurgy, petroleum, chemical industry and the like. The high-voltage variable-frequency speed regulating device with excellent performance, which is formed by the power unit cascading technology at the present stage, has the advantages of small harmonic wave, interchangeable units, mass production, convenient maintenance and the like, is more and more favored by domestic variable-frequency speed regulating device users, and has wide development prospect. The stability and reliability of the high-voltage variable-frequency speed regulating device are particularly important.
The unit cascade high-voltage variable-frequency speed regulating device widely used at present occasionally causes the situation that the whole variable-frequency speed regulating device cannot normally operate or even jumps due to the fact that individual power units fail in the operation of the device, so that the working reliability of the high-voltage variable-frequency speed regulating device is greatly reduced, and not only is the production safety greatly hidden trouble brought, but also great economic loss is brought to users. In order not to affect the operation of the system by individual faulty units, an intelligent bypass system for power units is highly desirable. At this time, the fault unit can be cut off through the unit intelligent bypass system, and the rest power unit continues to operate, so that the normal operation of the system is ensured.
At present, two types of power unit bypass systems of domestic high-voltage variable-frequency speed regulating devices mainly exist, one type is that bypass contactors are controlled by a power unit processor, and the power unit processor cannot normally work when the unit fails, so that the reliability of the system is directly affected. The other type is that the bypass contactor is controlled by the main controller, and the outstanding advantage is that the normal operation of the main controller is not affected when the unit fails, the bypass contactor can be effectively controlled, and the unit bypass in the real sense can be realized.
When the bypass command of the unit is executed, the state of the bypass contactor is not detected, and when the unit is short-circuited or the bypass contactor is not closed, the state cannot be known and monitored in time, and the operation of the device is possibly interrupted or damaged.
Disclosure of Invention
In view of the foregoing, the present invention provides a bypass control system for a power unit, including:
a plurality of power cells operating in series;
the control unit is connected with each power unit through a detection end respectively;
the control signal distribution unit is connected with the control unit;
a plurality of driving units; each driving unit is respectively in communication connection with the control signal distribution unit;
a plurality of contactors; each contactor is connected with the corresponding driving unit and the corresponding power unit respectively;
the control unit outputs a control signal to the control signal distribution unit when detecting that any power unit fails;
the control signal distribution unit outputs a distribution control signal to the driving unit for driving the contactor connected with the power unit with the fault according to the control signal;
the driving unit receiving the distribution control signal drives the contact of the contactor to be closed so as to short-circuit the power unit with faults;
the contactor comprises a feedback subunit, wherein the feedback subunit is connected with the driving unit and is used for feeding back a state signal reflecting the state of the contactor to the control unit through the driving unit and the control signal distribution unit in sequence;
the control unit judges whether the contactor acts according to the state signal.
The bypass control system is characterized in that the control signal distribution unit is respectively in communication connection with each driving unit through optical fibers.
The bypass control system described above, further includes:
and each driving power supply is respectively connected with one driving unit and is used for supplying power to the corresponding driving unit.
The bypass control system is characterized in that the driving power supply is connected with the driving unit through a cable.
The bypass control system, wherein the contactor is a low-voltage contactor.
In the bypass control system, the input power source of the power units running in series is a three-phase alternating current power source.
The bypass control system described above wherein the three-phase ac power is provided by an alternator.
The bypass control system, wherein the power unit is an insulated gate transistor or a metal oxide semiconductor field effect transistor.
The high-voltage variable-frequency speed regulating device comprises a bypass control system of any one of the power units.
The beneficial effects are that: the bypass control system and the high-voltage variable-frequency speed regulating device of the power unit can reliably short-circuit or isolate the power unit, and are high in reliability and easy to realize.
Drawings
Fig. 1 is a schematic diagram of a bypass control system of a power unit according to an embodiment of the invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, in a preferred embodiment, a bypass control system of a power unit is provided, where the bypass control system may include:
a plurality of power units 1 operating in series;
the control unit 2 is respectively connected with each power unit 1 through a detection end;
a control signal distribution unit 3 connected to the control unit 2;
a plurality of driving units 4; each driving unit 4 is respectively connected with the control signal distribution unit 3 in a communication way;
a plurality of contactors 5; each contactor 5 is respectively connected with the corresponding driving unit 4 and the power unit 1;
when detecting that any power unit 1 fails, the control unit 2 outputs a control signal to the control signal distribution unit 3;
the control signal distribution unit 3 outputs a distribution control signal to the driving unit 4 driving the contactor 5 connected to the failed power unit 1 according to the control signal;
the driving unit 4 receiving the distribution control signal drives the contacts of the contactor 5 to be closed so as to short-circuit the failed power unit 1;
the contactor 5 comprises a feedback subunit (not shown in the drawings), which is connected to the driving unit 4 and is configured to feed back a status signal reflecting the status of the contactor 5 to the control unit 2 via the driving unit 4 and the control signal distribution unit 3 in sequence;
the control unit 2 determines whether the contactor 5 is operated based on the status signal.
In the above technical solution, the feedback subunit may be a sensor, or may be a detection terminal led out from a contact or other voltage/current pre-tracking point of the contactor 5, for detecting whether the contactor 5 acts, if the contactor 5 acts to make the contact attracted, the contactor 5 is in an on-running state, otherwise, in an off-state, and the status signals received by the control unit 2 in the two states may be different, for example, the level values are different, so as to determine whether the power unit 1 has completed short circuit or isolation, so as to avoid the influence of other power units 1 on the serial circuit; after the control unit 2 determines whether the contactor 5 is operated, it may react according to the result of the determination, for example, control the connected display device to display a reminder, or alarm by an alarm device, etc.
In the above technical solution, the model of the control unit 2 may be a controller with DSP (Digital Signal Processing digital signal processing, abbreviated as DSP) and FPGA (Field Programmable Gate Array field programmable gate array, abbreviated as FPGA) as cores, so as to implement functions of signal acquisition, signal processing of on/off, implementation of control algorithm, fault information processing, and man-machine interaction implementation; the control signal distribution unit 3 may use an FPGA as a core; the driving unit 4 may be composed of a relay, an optocoupler, a transistor, and the like.
In a preferred embodiment, the control signal distribution unit 3 is in communication with each drive unit 4 via an optical fiber.
In a preferred embodiment, the method may further include:
and a plurality of driving power sources 6, wherein each driving power source 6 is respectively connected with one driving unit 4 and is used for supplying power to the corresponding driving unit 4.
In the above embodiment, it is preferable that the driving power supply 6 and the driving unit 4 are connected by a cable.
In a preferred embodiment, the contactor 5 may be a low voltage contactor, but this is only a preferred case and should not be construed as limiting the invention.
In a preferred embodiment, the input power to the power units 1 operated in series is a three-phase ac power source, but this is only a preferred case and should not be construed as limiting the invention.
In the above embodiment, preferably, the three-phase ac power source may be provided by an alternator, but this is only a preferable case and should not be construed as limiting the present invention.
In a preferred embodiment, the power cell 1 may be an insulated gate transistor or a metal oxide semiconductor field effect transistor or the like.
In a preferred embodiment, a high voltage variable frequency speed regulating device is also provided, which comprises a bypass control system of any one of the power units.
By way of illustration and the accompanying drawings, there is shown exemplary examples of specific structures of the embodiments and other variations may be made based on the spirit of the invention. While the above invention is directed to the presently preferred embodiments, such disclosure is not intended to be limiting.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalents and alternatives falling within the scope of the claims are intended to be embraced therein.
Claims (9)
1. A bypass control system for a power cell, comprising:
a plurality of power cells operating in series;
the control unit is connected with each power unit through a detection end respectively;
the control signal distribution unit is connected with the control unit;
a plurality of driving units; each driving unit is respectively in communication connection with the control signal distribution unit;
a plurality of contactors; each contactor is connected with the corresponding driving unit and the corresponding power unit respectively;
the control unit outputs a control signal to the control signal distribution unit when detecting that any power unit fails;
the control signal distribution unit outputs a distribution control signal to the driving unit for driving the contactor connected with the power unit with the fault according to the control signal;
the driving unit receiving the distribution control signal drives the contact of the contactor to be closed so as to short-circuit the power unit with faults;
the contactor comprises a feedback subunit, wherein the feedback subunit is connected with the driving unit and is used for feeding back a state signal reflecting the state of the contactor to the control unit through the driving unit and the control signal distribution unit in sequence;
the control unit judges whether the contactor acts according to the state signal;
the state signal is a level value, and the control unit judges whether the power unit is short-circuited or isolated according to the change of the level value, and displays a prompt or generates an alarm.
2. The bypass control system of claim 1, wherein the control signal distribution unit is communicatively coupled to each of the drive units via an optical fiber.
3. The bypass control system of claim 1, further comprising:
and each driving power supply is respectively connected with one driving unit and is used for supplying power to the corresponding driving unit.
4. A bypass control system according to claim 3, characterized in that the drive power supply and the drive unit are connected by means of a cable.
5. The bypass control system of claim 1, wherein the contactor is a low voltage contactor.
6. The bypass control system of claim 1, wherein the input power source of the power cells operating in series is a three-phase ac power source.
7. The bypass control system of claim 6, wherein the three-phase ac power source is provided by an alternator.
8. The bypass control system of claim 1, wherein the power cell is an insulated gate transistor or a metal oxide semiconductor field effect transistor.
9. The high-voltage variable-frequency speed regulating device is characterized by comprising the bypass control system of any one of the power units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710517538.3A CN107171537B (en) | 2017-06-29 | 2017-06-29 | Bypass control system of power unit and high-voltage variable-frequency speed regulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710517538.3A CN107171537B (en) | 2017-06-29 | 2017-06-29 | Bypass control system of power unit and high-voltage variable-frequency speed regulation device |
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| CN107171537A CN107171537A (en) | 2017-09-15 |
| CN107171537B true CN107171537B (en) | 2023-07-14 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110474299B (en) * | 2019-08-15 | 2022-04-15 | 荣信汇科电气股份有限公司 | Bypass state cycle reporting method and topology structure of power unit |
| CN110460380A (en) * | 2019-08-30 | 2019-11-15 | 上海电气富士电机电气技术有限公司 | A kind of high voltage transducer power unit optical fiber ring network communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11355908A (en) * | 1998-06-10 | 1999-12-24 | Hitachi Ltd | Controller for electric car |
| CN206164100U (en) * | 2016-09-21 | 2017-05-10 | 上海思源电力电容器有限公司 | High voltage circuit breaker selects looks switching control system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369780B (en) * | 2007-08-14 | 2011-04-20 | 湖北三环发展股份有限公司 | Unit bypass apparatus and control method of unit cascading high voltage frequency converter |
| CN101299572A (en) * | 2008-05-23 | 2008-11-05 | 北京合康亿盛科技有限公司 | Pass-by apparatus for high voltage frequency transformer |
| CN203596728U (en) * | 2013-10-23 | 2014-05-14 | 桂林君泰福电气有限公司 | High voltage frequency converter power unit machinery bypass device |
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- 2017-06-29 CN CN201710517538.3A patent/CN107171537B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11355908A (en) * | 1998-06-10 | 1999-12-24 | Hitachi Ltd | Controller for electric car |
| CN206164100U (en) * | 2016-09-21 | 2017-05-10 | 上海思源电力电容器有限公司 | High voltage circuit breaker selects looks switching control system |
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