CN108429246A - A kind of wind power plant current collection line protection method and device - Google Patents
A kind of wind power plant current collection line protection method and device Download PDFInfo
- Publication number
- CN108429246A CN108429246A CN201810269643.4A CN201810269643A CN108429246A CN 108429246 A CN108429246 A CN 108429246A CN 201810269643 A CN201810269643 A CN 201810269643A CN 108429246 A CN108429246 A CN 108429246A
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- Prior art keywords
- line
- voltage
- electric line
- collection electric
- collection
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a kind of wind power plant current collection line protection methods and device, this method to include：Judge that the short-circuit-type of short circuit occurs for the collection electric line when detecting that collection electric line occurs short-circuit；When three-phase or line to line fault occur for the collection electric line, start direction overcurrent element and short delay mode；When the collection electric line single phase ground fault, start zero sequence excess current element and short delay mode.In above-mentioned short-circuit process, as direction overcurrent element or zero sequence excess current element have been turned on and current collection line bus voltage be down to 20% rated voltage hereinafter, if be latched delay mode, snap action is in tripping.Pass through the above method and device; it can be when the tripping of current collection power line main protection and grid-connected voltage fall to 20% rated voltage or less; rapid excision failure; ensure the wind turbine normal operation of other collection electric lines; improve the availability of wind power plant; reduce scope of power outage, is conducive to wind power plant safe and stable operation.
Description
Technical field：
The present invention relates to technical field of wind power generation more particularly to a kind of wind power plant current collection line protection methods and device.
Background technology：
With the getting worse of environmental pollution, the direction that people endeavour research is become using clean energy resource power generation.Currently, wind
Power power generation is more widely used in the production and living of people.《Wind power plant accesses power system technology regulation》It is required that " wind-powered electricity generation
When field grid entry point voltage falls to 20% rated voltage, the Wind turbines in wind power plant should ensure that not off-grid continuous operation 625ms ".
Inventor has found that, when wind power plant collection electric line close-in fault, voltage can fall in the implementation of the present invention
20% nominal voltage is not hereinafter, wind turbine has low voltage ride-through capability at this time.In this case, if the collection main guarantor of electric line
Protect tripping, the wind turbine of Neighbor Set electric line can automatic off-grid, cause whole audience large-area power-cuts.Solving the problems, such as this preferred embodiments is
Wind turbine has no-voltage ride-through capability, but is limited by technology and cost, and wind turbine does not have no-voltage ride-through capability also at present.
Invention content：
The purpose of the present invention is to provide a kind of wind power plant current collection line protection method and devices, above-mentioned existing to solve
The problem of technology.
The present invention is implemented by following technical solution：
An embodiment of the present invention provides a kind of wind power plant current collection line protection methods, including：
When detecting that short circuit occurs for collection electric line, judge that the short-circuit-type of short circuit occurs for the collection electric line；When described
When collecting electric line generation three-phase or line to line fault, start direction overcurrent element and short delay mode；When the collection electric line is sent out
When raw single-line to ground fault, start zero sequence excess current element and short delay mode.
Further, when three-phase occurs for the collection electric line or when line to line fault, start direction overcurrent element and short prolong
When pattern, including：Judge whether the busbar voltage of the collection electric line is down to 20% rated line voltage or less；If the collection electric wire
The busbar voltage on road does not drop to 20% rated line voltage hereinafter, not starting lower voltage components, and protection is through deferred action in jump
Lock.
Further, the method further includes：If the busbar voltage of the collection electric line is down to described 20% specified line electricity
Pressure is hereinafter, start the lower voltage components and locking delay mode, snap action is in tripping.
Further, described when the collection electric line single phase ground fault, start zero sequence excess current element and short
Delay mode, including：Judge whether the busbar voltage of the collection electric line is down to 20% specified phase voltage or less；If the current collection
The busbar voltage of circuit does not drop to 20% specified phase voltage hereinafter, not starting lower voltage components, protection through deferred action in
Tripping.
Further, the method further includes：If the busbar voltage of the collection electric line is down to described 20% specified phase electricity
Pressure is hereinafter, start the lower voltage components and locking delay mode, snap action is in tripping.
Another embodiment of the present invention provides a kind of wind power plant current collection line protective devices, including：
Judgment module judges to collect the short-circuit-type that short circuit occurs for electric line；First starting module, for working as the collection electric wire
When three-phase or line to line fault occur for road, start direction overcurrent element and short delay mode；Second starting module, for when described
When collecting electric line single phase ground fault, start zero sequence excess current element and short delay mode.
Further, first starting module includes：First judging unit, the busbar for judging the collection electric line
Whether voltage is down to 20% rated line voltage or less；First maintenance unit, if the busbar voltage for the collection electric line does not drop
To 20% rated line voltage hereinafter, not starting lower voltage components, protection is through deferred action in tripping.
Further, first starting module includes：First start unit, if the busbar electricity for the collection electric line
Pressure drop is to 20% rated line voltage hereinafter, starting the lower voltage components and locking delay mode, snap action is in tripping.
Further, second starting module specifically includes：Second judgment unit, for judging the collection electric line
Whether busbar voltage is down to 20% specified phase voltage or less；Second maintenance unit, if the busbar voltage for the collection electric line
20% specified phase voltage is not dropped to hereinafter, not starting lower voltage components, protection is through deferred action in tripping.
Further, second starting module specifically includes：Second start unit, if the mother for the collection electric line
Line drop to 20% specified phase voltage hereinafter, start the lower voltage components and locking delay mode, snap action in
Tripping.
Advantages of the present invention：
Wind power plant current collection line protection method and device provided in an embodiment of the present invention, can refuse in current collection power line main protection
When dynamic and grid-connected voltage falls to 20% rated voltage or less, failure is cut off rapidly, ensures that the wind turbine of other collection electric lines is normally transported
Row, improves the availability of wind power plant, reduces scope of power outage, be conducive to wind power plant safe and stable operation.
Description of the drawings：
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
The wind power plant current collection line protection method flow chart that Fig. 1 is provided by the embodiment of the present invention；
The wind power plant current collection line protection method flow chart that Fig. 2 is provided by the embodiment of the present invention；
The wind power plant current collection line protection method flow chart that Fig. 3 is provided by the embodiment of the present invention；
The wind power plant current collection line protective devices structural schematic diagram that Fig. 4 is provided by the embodiment of the present invention；
The wind power plant current collection line protective devices structural schematic diagram that Fig. 5 is provided by the embodiment of the present invention.
Specific implementation mode：
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is the purpose only merely for description specific embodiment, is not intended to be limiting
The present invention.In the embodiment of the present invention and "an" of singulative used in the attached claims, " described " and "the"
It is also intended to including most forms, unless context clearly shows that other meanings.
The technical solution of the embodiment of the present invention is described in detail below：
Fig. 1 is wind power plant current collection line protection method flow chart provided in an embodiment of the present invention.As shown in Figure 1, of the invention
The wind power plant current collection line protection method that embodiment provides, including：
S101 judges to collect the short-circuit-type that short circuit occurs for electric line when detecting that short circuit occurs for collection electric line.
S102 starts direction overcurrent element and short delay mould when three-phase or line to line fault occur for the collection electric line
Formula.
In Neighbor Set line fault, this collection electric line also provides short circuit current.Collection electric line only installs overcurrent protection,
It can cause to protect tripping of bypassing the immediate leadership.To solve the selectivity of protection, directional element has been installed on the basis of original current protection
(being directed toward wind turbine side in direction).
Specifically, which further includes：
S1021, judges whether the busbar voltage of the collection electric line is down to 20% rated line voltage or less.If the current collection
The busbar voltage of circuit does not drop to 20% rated line voltage hereinafter, thening follow the steps S1022；If the mother of the collection electric line
Line drop is to 20% rated line voltage hereinafter, thening follow the steps S1023.
S1022 does not start lower voltage components, and protection is through deferred action in tripping.
S1023 starts the lower voltage components and locking delay mode, and snap action is in tripping.
When collecting electric line close-in fault busbar voltage less than 20% nominal voltage, back-up protection is instantaneous as main protection
Act the wind turbine normal operation that ensure that other collection electric lines in tripping.Back-up protection snap action is in tripping under such failure,
The not selectivity of sacrificing protection.When collecting electric line close-in fault busbar voltage less than 20% nominal voltage, wind turbine does not have
Standby low voltage ride-through capability collects the whole off-grids of wind turbine meeting in electric line, and back-up protection fast trip does not expand power failure at this time
Range.
S103 starts zero sequence excess current element and short delay mode when the collection electric line single phase ground fault.
Specifically, which further includes：
S1031, judges whether the busbar voltage of the collection electric line is down to 20% specified phase voltage or less.If the current collection
The busbar voltage of circuit does not drop to 20% specified phase voltage hereinafter, thening follow the steps S1032；If the mother of the collection electric line
Line drop is to 20% specified phase voltage hereinafter, thening follow the steps S1033.
S1032 does not start lower voltage components, and protection is through deferred action in tripping.
S1033 starts the lower voltage components and locking delay mode, and snap action is in tripping.
When collecting electric line close-in fault busbar voltage less than 20% nominal voltage, back-up protection is instantaneous as main protection
Act the wind turbine normal operation that ensure that other collection electric lines in tripping.Back-up protection snap action is in tripping under such failure,
The not selectivity of sacrificing protection.When collecting electric line close-in fault busbar voltage less than 20% nominal voltage, wind turbine does not have
Standby low voltage ride-through capability collects the whole off-grids of wind turbine meeting in electric line, and back-up protection fast trip does not expand power failure at this time
Range.
When collecting electric line far field failure, this method can be protected as common back-up protection method in collection electric line
Electrical equipment is without damage, while will not lead to the wind turbine off-grid of other collection electric lines.
Wind power plant current collection line protection method provided in an embodiment of the present invention, can in the tripping of current collection power line main protection and simultaneously
When net voltage falls to 20% rated voltage or less, failure is cut off rapidly, is ensured the wind turbine normal operation of other collection electric lines, is improved
The availability of wind power plant, reduces scope of power outage, is conducive to wind power plant safe and stable operation.
Fig. 4 is wind power plant current collection line protective devices structure chart provided in an embodiment of the present invention.As shown in figure 4, the device
It specifically includes：Judgment module 410, the first starting module 420 and the second starting module 430.
Specifically, the judgment module 410 collects electric line hair for when detecting that short circuit occurs for collection electric line, judging
The short-circuit-type of raw short circuit；First starting module 420 is used for when three-phase or line to line fault occur for the collection electric line,
Start direction overcurrent element and short delay mode；Second starting module 430, it is single-phase for working as collection electric line generation
When ground short circuit, start zero sequence excess current element and short delay mode.
Fig. 5 is wind power plant current collection line protective devices structure chart provided in an embodiment of the present invention.As shown in figure 5, the device
It specifically includes：Judgment module 510, the first starting module 520 and the second starting module 530.
Further, first starting module 520 includes：First judging unit 521, the first maintenance unit 522 and
One start unit 523.
Specifically, first judging unit 521, for judging whether the busbar voltage of the collection electric line is down to 20%
Below rated line voltage；First maintenance unit 522, if the busbar voltage for the collection electric line does not drop to described 20%
Rated line voltage is not hereinafter, start lower voltage components, and protection is through deferred action in tripping；First start unit 523, is used for
If the busbar voltage of the collection electric line is down to 20% rated line voltage hereinafter, starting the lower voltage components and locking is prolonged
When pattern, snap action is in tripping.
Further, second starting module 530 includes：Second judgment unit 531, the second maintenance unit 532, second
Start unit 533
Specifically, the second judgment unit 531, for judging whether the busbar voltage of the collection electric line is down to 20%
Below specified phase voltage；Second maintenance unit 532, if the busbar voltage for the collection electric line does not drop to described 20%
Specified phase voltage is not hereinafter, start lower voltage components, and protection is through deferred action in tripping；Second start unit 533, is used for
If the busbar voltage of the collection electric line is down to 20% specified phase voltage hereinafter, starting the lower voltage components and locking is prolonged
When pattern, snap action is in tripping.
Wind power plant current collection line protective devices provided in an embodiment of the present invention are specifically used for executing Fig. 1-embodiment illustrated in fig. 3
The method of offer, realization principle, method and function and usage etc. are similar with Fig. 1-embodiment illustrated in fig. 3, no longer superfluous herein
It states.
The apparatus embodiments described above are merely exemplary, wherein the module illustrated as separating component can
It is physically separated with being or may not be, the component shown as module may or may not be physics mould
Block, you can be located at a place, or may be distributed on multiple network modules.It can be selected according to the actual needs
In some or all of module achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case of, you can to understand and implement.
Storage medium is deposited an embodiment of the present invention provides a kind of non-transient computer is readable, the computer storage media is deposited
Contain computer executable instructions, wherein when the computer executable instructions are executed by electronic equipment, the electronics is made to set
The standby upper wind power plant current collection line protection method executed in above-mentioned any means embodiment.
An embodiment of the present invention provides a kind of computer program products, wherein the computer program product includes storage
Computer program in non-transient computer readable storage medium, the computer program include program instruction, wherein work as institute
When stating program instruction and being executed by electronic equipment, the electronic equipment is made to execute the wind power plant current collection in above-mentioned any means embodiment
Line protection method.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It is realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be expressed in the form of software products in other words, should
Computer software product can store in a computer-readable storage medium, the computer readable recording medium storing program for performing include for
Any mechanism of the readable form storage of computer (such as computer) or transmission information.For example, machine readable media includes only
Read memory (ROM), random access memory (RAM), magnetic disk storage medium, optical storage media, flash medium, electricity, light,
The transmitting signal (for example, carrier wave, infrared signal, digital signal etc.) etc. of sound or other forms, which includes
Some instructions are used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes respectively
Method described in certain parts of a embodiment or embodiment.
Finally it should be noted that：Above example is only to illustrate the technical solution of the embodiment of the present invention, rather than limits it
System；Although the present invention is described in detail referring to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its
Foregoing embodiments can still be remembered
The technical solution of load is modified or equivalent replacement of some of the technical features；And these modification or
Person replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of wind power plant current collection line protection method, which is characterized in that including：
When detecting that short circuit occurs for collection electric line, judge that the short-circuit-type of short circuit occurs for the collection electric line；
When three-phase or line to line fault occur for the collection electric line, start direction overcurrent element and short delay mode；
When the collection electric line single phase ground fault, start zero sequence excess current element and short delay mode.
2. according to the method described in claim 1, it is characterized in that, when three-phase occurs for the collection electric line or when line to line fault,
Start direction overcurrent element and short delay mode, including：
Judge whether the busbar voltage of the collection electric line is down to 20% rated line voltage or less；
If the busbar voltage of the collection electric line does not drop to 20% rated line voltage hereinafter, not starting lower voltage components, protect
Shield is through deferred action in tripping.
3. according to the method described in claim 2, it is characterized in that, the method further includes：
If the busbar voltage of the collection electric line is down to 20% rated line voltage hereinafter, starting the lower voltage components and closing
Delay mode is locked, snap action is in tripping.
4. according to the method described in claim 1, it is characterized in that, when the collection electric line single phase ground fault, open
Dynamic zero sequence excess current element and short delay mode, including：
Judge whether the busbar voltage of the collection electric line is down to 20% specified phase voltage or less；
If the busbar voltage of the collection electric line does not drop to 20% specified phase voltage hereinafter, not starting lower voltage components, protect
Shield is through deferred action in tripping.
5. according to the method described in claim 4, it is characterized in that, the method further includes：
If the busbar voltage of the collection electric line is down to 20% specified phase voltage hereinafter, starting the lower voltage components and closing
Delay mode is locked, snap action is in tripping.
6. a kind of wind power plant current collection line protective devices, which is characterized in that including：
Judgment module collects the short-circuit-type that short circuit occurs for electric line for when detecting that short circuit occurs for collection electric line, judging；
First starting module, for three-phase occurring or when line to line fault when the collection electric line, start direction overcurrent element with
Short delay mode；
Second starting module, for when the collection electric line single phase ground fault, startup zero sequence excess current element and short
Delay mode.
7. device according to claim 6, which is characterized in that first starting module includes：
First judging unit, for judging whether the busbar voltage of the collection electric line is down to 20% rated line voltage or less；
First maintenance unit, if the busbar voltage for the collection electric line does not drop to 20% rated line voltage hereinafter, not
Start lower voltage components, protection is through deferred action in tripping.
8. device according to claim 7, which is characterized in that first starting module includes：
First start unit, if the busbar voltage for the collection electric line is down to 20% rated line voltage hereinafter, starting
The lower voltage components and locking delay mode, snap action is in tripping.
9. device according to claim 6, which is characterized in that second starting module specifically includes：
Second judgment unit, for judging whether the busbar voltage of the collection electric line is down to 20% specified phase voltage or less；
Second maintenance unit, if the busbar voltage for the collection electric line does not drop to 20% specified phase voltage hereinafter, not
Start lower voltage components, protection is through deferred action in tripping.
10. device according to claim 9, which is characterized in that second starting module specifically includes：
Second start unit, if the busbar voltage for the collection electric line is down to 20% specified phase voltage hereinafter, starting
The lower voltage components and locking delay mode, snap action is in tripping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810269643.4A CN108429246A (en) | 2018-03-29 | 2018-03-29 | A kind of wind power plant current collection line protection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810269643.4A CN108429246A (en) | 2018-03-29 | 2018-03-29 | A kind of wind power plant current collection line protection method and device |
Publications (1)
| Publication Number | Publication Date |
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| CN108429246A true CN108429246A (en) | 2018-08-21 |
Family
ID=63159996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810269643.4A Pending CN108429246A (en) | 2018-03-29 | 2018-03-29 | A kind of wind power plant current collection line protection method and device |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109449896A (en) * | 2018-11-29 | 2019-03-08 | 西安西瑞控制技术股份有限公司 | A kind of override trip prevention method of switching station |
| CN111276931A (en) * | 2020-02-18 | 2020-06-12 | 广东电网有限责任公司电力调度控制中心 | New energy peripheral alternating current line protection fixed value checking method, system and equipment |
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