CN208241311U - A kind of double-fed wind generator current transformer Crowbar protection circuit - Google Patents
A kind of double-fed wind generator current transformer Crowbar protection circuit Download PDFInfo
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- CN208241311U CN208241311U CN201820847707.XU CN201820847707U CN208241311U CN 208241311 U CN208241311 U CN 208241311U CN 201820847707 U CN201820847707 U CN 201820847707U CN 208241311 U CN208241311 U CN 208241311U
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- side converter
- crowbar
- plc controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
A kind of double-fed wind generator current transformer Crowbar protection circuit; including wind blade, gear-box and double feedback electric engine; the connection line of double feedback electric engine and step-up transformer is equipped with anti-surge circuit and double-feed current transformer, and the connection line of anti-surge circuit and double-feed current transformer is equipped with Crowbar and protects circuit；Anti-surge circuit is made of by-pass switch K and resistance R1, and by-pass switch K is connect with PLC controller；Double-feed current transformer includes rotor-side converter RSC, grid-side converter GSC and capacitor C, and grid-side converter GSC is connect by current sensor 3 with PLC controller；It includes three-phase rectification bridge, thyristor IGBT and bleeder resistance R2 that Crowbar, which protects circuit; thyristor IGBT is connect with PLC controller; Crowbar protects the connecting side of circuit and rotor-side converter RSC to be equipped with current sensor 1, and current sensor 1 is connect with PLC controller.The number that the circuit can effectively reduce Crowbar protection circuit investment effectively improves the low voltage ride-through capability of double feedback electric engine to reduce the reactive power that blower absorbs during failure.
Description
Technical field
The utility model relates to field of wind power equipment, and in particular to a kind of double-fed wind generator current transformer Crowbar guarantor
Protection circuit.
Background technique
Double-fed wind power generator group is the mainstream model in current wind-powered electricity generation field, in mounted wind-driven generator, 70%
It is all fed System above.For current transformer, the major advantage of fed System is that only Partial Power flows through current transformer, and has
It function and idle can individually adjust.However, it is smaller just because of Converter Capacity, so that it is very sensitive to electric network fault, need
Reliable safeguard measure is taken, to prevent the damage of power device in current transformer.
Currently, one can be provided during grid voltage sags for rotor-side electric current by installing Crowbar circuit additional in rotor-side
Access is to protect rotor-side converter RSC and blower.However, double feedback electric engine DFIG enters general during Crowbar circuit operation
The uncontrollable state of Squirrel Cage Asynchronous Motors, especially during power system restoration, can be absorbed from power grid a large amount of reactive power with
Make excitation, have an adverse effect to the voltage stability of surrounding area, to be unfavorable for the rapid recovery of system.
Applicant is in dual feedback wind power generation system low voltage crossing lift technique research (project number: 2018JS538)
Whole work of the technical solution of patent application document are completed under funded projects.
Utility model content
The utility model to solve the above-mentioned problems, devises a kind of double-fed wind generator current transformer Crowbar protection circuit,
The circuit can effectively reduce the number of Crowbar protection circuit investment, so that the reactive power that blower absorbs during failure is reduced,
Effectively improve the low voltage ride-through capability of double feedback electric engine DFIG.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the utility model is real by the following technical programs
Existing:
A kind of double-fed wind generator current transformer Crowbar protection circuit, including wind blade, gear-box and double feedback electric engine, wind
Power blade is connect with gear-box, and gear-box is connect with double feedback electric engine, and double feedback electric engine is connected to the grid by step-up transformer, feature
It is, the connection line of the double feedback electric engine and step-up transformer is equipped with anti-surge circuit and double-feed current transformer, Anti-surging
The connection line of circuit and double-feed current transformer is equipped with Crowbar and protects circuit；
The anti-surge circuit is made of the by-pass switch K and resistance R1 being set on three-phase line, by-pass switch with
Resistance R1 is in parallel, and by-pass switch K is connect with PLC controller；
The double-feed current transformer includes rotor-side converter RSC, grid-side converter GSC and capacitor C, rotor-side converter
It connects after RSC is in parallel with capacitor C with grid-side converter GSC, rotor-side converter RSC passes through current sensor 2 and PLC controller
Connection, grid-side converter GSC are connect by current sensor 3 with PLC controller；
The Crowbar protection circuit includes three-phase rectification bridge, thyristor IGBT and bleeder resistance R2, three-phase rectification bridge
Each bridge arm on be in series with 2 diodes, thyristor IGBT is incorporated to three-phase rectification bridge, thyristor after connecting with bleeder resistance R2
IGBT is connect with PLC controller, and Crowbar protects the connecting side of circuit and rotor-side converter RSC to be equipped with current sensor 1,
Current sensor 1 is connect with PLC controller.
Preferably, the PLC controller selects siemens PLC CN type PLC, by-pass switch K to select CJX1-400 type
Contactor.
The beneficial effects of the utility model are: the circuit can effectively reduce the number of Crowbar protection circuit investment, thus
The reactive power that blower absorbs during reducing failure, effectively improves the low voltage ride-through capability of double feedback electric engine DFIG.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the utility model embodiment, make required for being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of circuit structure diagram of double-fed wind generator current transformer Crowbar protection circuit.
In attached drawing, parts list represented by the reference numerals are as follows:
1- wind blade, 2- gear-box, 3- double feedback electric engine, 4- step-up transformer, 5- power grid, 6- double-feed current transformer, 7- are anti-
Surge circuit, 8-Crowbar protect circuit, 9-PLC controller, 10- current sensor 1,11- current sensor 2,12- electric current
Sensor 3,61- rotor-side converter RSC, 62- grid-side converter GSC, 63- capacitor C, 71- by-pass switch K, 72- resistance R1,
81- bleeder resistance R2.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
All other embodiment obtained, fall within the protection scope of the utility model.
As shown in fig.1, a kind of double-fed wind generator current transformer Crowbar protects circuit, including wind blade 1, gear-box 2
With double feedback electric engine 3, wind blade is connect with gear-box, and gear-box is connect with double feedback electric engine, and double feedback electric engine passes through step-up transformer 4
It is connected to the grid 5, the connection line of the double feedback electric engine 3 and step-up transformer 4 is equipped with anti-surge circuit 7 and double-feed current transformer
6, anti-surge circuit 7 and the connection line of double-feed current transformer 6 protect circuit 8 equipped with Crowbar；
The anti-surge circuit 7 is made of the by-pass switch K 71 and resistance R1 72 being set on three-phase line, bypass
Switch K 71 is in parallel with resistance R1 72, and by-pass switch K is connect with PLC controller；
The double-feed current transformer 6 includes rotor-side converter RSC 61, grid-side converter GSC62 and capacitor C 63, is turned
Sub- side current transformer RSC 61 connects with after 63 parallel connection of capacitor C with grid-side converter GSC 62, and rotor-side converter RSC 61 passes through
Current sensor 2 11 is connect with PLC controller 9, and grid-side converter GSC 62 passes through current sensor 3 12 and PLC controller 9
Connection；
The Crowbar protection circuit 8 includes three-phase rectification bridge, thyristor IGBT and bleeder resistance R2 81, and three-phase is whole
It flows and is in series with 2 diodes on each bridge arm of bridge, thyristor IGBT is incorporated to three phase rectifier after connecting with bleeder resistance R2 81
Bridge, thyristor IGBT are connect with PLC controller 9, and Crowbar protection circuit 8 and the connecting side of rotor-side converter RSC 61 are set
There is current sensor 1 10, current sensor 1 10 is connect with PLC controller 9.
In the present embodiment, PLC controller 9 selects siemens PLC CN type PLC, by-pass switch K 71 to select CJX1-400
Type contactor.
The working principle of the circuit is as follows: when (DFIG) grid voltage sags of double feedback electric engine 3 to certain depth lead to rotor
When 61 over-voltage of side current transformer RSC, overcurrent, current sensor 1 10 by the voltage value measured be input in PLC controller 9 and with
Setting value is compared, and when actual voltage value, current value are greater than the set value, PLC controller 9 drives by-pass switch K 71 disconnected
It opens, the surge current that 3 rotor of double feedback electric engine generates at this time can be limited by resistance R1 72；Further fall when voltage or
Network voltage aggravation, which is fallen, during failure causes rotor current further excessive, and resistance R1 72 cannot quickly limit overcurrent
And when jeopardizing rotor-side converter RSC 61, the electric current at rotor-side converter RSC 61 will be electric by current sensor 2 11 at this time
For value. transfer to PLC controller 9 and compared with setting value, PLC controller 9 drives the thyristor IGBT of Crowbar protection circuit 8
Conducting, bleeder resistance R2 releases overcurrent at this time, and the overcurrent that double fed electric machine rotor side generates is in resistance R1 and vent discharge
Rapid decay under the style of work of R2 is hindered, to protect rotor-side jointly using anti-surge circuit 7 and Crowbar protection circuit 8
Current transformer RSC 61；When current attenuation to 6 permissible value of double-feed current transformer, 62 both ends of rotor-side converter 61 and grid-side converter
Current value pass through current sensor 2 11 respectively and current sensor 3 12 is transmitted in PLC controller 9 and setting value carries out
Compare it is thick, PLC controller 9 drive Crowbar protection circuit 8 thyristor IGBT disconnect, at this time Crowbar protect circuit 8 move back
It works out, anti-surge circuit 7 is still within working condition at this time；When electric current is lower than the rated value of double-feed current transformer 6, PLC control
Device 9 processed drives by-pass switch K 71 to close, and double feedback electric engine is transferred in normal operating conditions at this time；The circuit realizes reduction
Crowbar protects investment number and the working time of circuit 8, to realize the reactive power that blower absorbs during reducing failure
Purpose is conducive to the recovery of power grid so that double feedback electric engine is quickly restored to steady-state operation situation.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one of the utility model
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more embodiment or examples
In can be combined in any suitable manner.
The preferred embodiment in the utility model disclosed above is only intended to help to illustrate the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, also not limiting the utility model is only the specific embodiment.Obviously, according to this theory
The content of bright book can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably
The principles of the present invention and practical application are explained, so that skilled artisan be enable to better understand and utilize this
Utility model.The utility model is limited only by the claims and their full scope and equivalents.
Claims (2)
1. a kind of double-fed wind generator current transformer Crowbar protects circuit, including wind blade, gear-box and double feedback electric engine, wind-force
Blade is connect with gear-box, and gear-box is connect with double feedback electric engine, and double feedback electric engine is connected to the grid by step-up transformer, and feature exists
In the connection line of the double feedback electric engine and step-up transformer is equipped with anti-surge circuit and double-feed current transformer, Anti-surging electricity
The connection line of road and double-feed current transformer is equipped with Crowbar and protects circuit；
The anti-surge circuit is made of the by-pass switch K and resistance R1 being set on three-phase line, by-pass switch K and resistance
R1 is in parallel, and by-pass switch K is connect with PLC controller；
The double-feed current transformer includes rotor-side converter RSC, grid-side converter GSC and capacitor C, rotor-side converter RSC
It connects after in parallel with capacitor C with grid-side converter GSC, rotor-side converter RSC is connected by current sensor 2 and PLC controller
It connects, grid-side converter GSC is connect by current sensor 3 with PLC controller；
The described Crowbar protection circuit includes three-phase rectification bridge, thyristor IGBT and bleeder resistance R2, three-phase rectification bridge it is every
2 diodes are in series on a bridge arm, thyristor IGBT is incorporated to three-phase rectification bridge, thyristor IGBT after connecting with bleeder resistance R2
It is connect with PLC controller, Crowbar protects the connecting side of circuit and rotor-side converter RSC to be equipped with current sensor 1, electric current
Sensor 1 is connect with PLC controller.
2. a kind of double-fed wind generator current transformer Crowbar according to claim 1 protects circuit, which is characterized in that described
PLC controller select siemens PLC CN type PLC, by-pass switch K select CJX1-400 type contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820847707.XU CN208241311U (en) | 2018-06-01 | 2018-06-01 | A kind of double-fed wind generator current transformer Crowbar protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820847707.XU CN208241311U (en) | 2018-06-01 | 2018-06-01 | A kind of double-fed wind generator current transformer Crowbar protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208241311U true CN208241311U (en) | 2018-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820847707.XU Expired - Fee Related CN208241311U (en) | 2018-06-01 | 2018-06-01 | A kind of double-fed wind generator current transformer Crowbar protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208241311U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581570A (en) * | 2019-08-06 | 2019-12-17 | 王飞 | Environment-friendly energy-saving efficient power cycle operation power generation technology |
-
2018
- 2018-06-01 CN CN201820847707.XU patent/CN208241311U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581570A (en) * | 2019-08-06 | 2019-12-17 | 王飞 | Environment-friendly energy-saving efficient power cycle operation power generation technology |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181214 Termination date: 20200601 |
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| CF01 | Termination of patent right due to non-payment of annual fee |