CN110098634A - A kind of wind-electricity integration system with superconductive current limiter - Google Patents
A kind of wind-electricity integration system with superconductive current limiter Download PDFInfo
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- CN110098634A CN110098634A CN201910136644.6A CN201910136644A CN110098634A CN 110098634 A CN110098634 A CN 110098634A CN 201910136644 A CN201910136644 A CN 201910136644A CN 110098634 A CN110098634 A CN 110098634A
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- wind
- current limiter
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- 230000010354 integration Effects 0.000 title claims abstract description 21
- 230000005611 electricity Effects 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002887 superconductor Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 238000010248 power generation Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000013461 design Methods 0.000 description 3
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- 230000001965 increasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
-
- H02J3/386—
-
- 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
Abstract
The wind-electricity integration system with superconductive current limiter that the present invention relates to a kind of, the system includes multiple wind power plant units, superconductive current limiter, by being connected after rectification variable-frequency device and conducting wire group with the side of collection bus row, the other side of the collection bus row is successively connected after the superconductive current limiter, breaker and transformer with grid side each wind power plant unit in order.Compared with prior art, the present invention have cope with rapidly it is grid-connected be likely to occur short trouble when, not using traditional high resistance current limiting device, improve voltage class and back-to-back technology, but utilize the superconductor in high tc superconducting fault current limiter (low-loss is through-flow and efficient current limliting) that there is normally-superconducting state conversion characteristic, so that running efficiency of system is higher, the advantages that better reliability.
Description
Technical field
The present invention relates to technical field of wind power generation, more particularly, to a kind of wind-electricity integration system with superconductive current limiter.
Background technique
Wind-power electricity generation is the generation mode of a kind of clean type, high efficiency, not can cause environmental pollution not only, but also pole
The big use for improving the energy.Wind-powered electricity generation is broadly divided into land wind-power electricity generation and Oversea wind power generation, wind power plant at this stage in China
The operation conditions of grid-connected route has important influence to the operation of electric system and generating set, if the appearance of grid-connected route is short
Road failure, which carries out efficiently handling not in time, then can cause inestimable influence to personal safety and economy, therefore in recent years
The processing common method of short trouble has direct-vision method, state examination, circuit split plot design and unit split plot design etc., specific mode
It is improved voltage class, bus section is run, low reactance is grounded, using high impedance voltage device, current-limiting reactor and back-to-back skill
Art etc..
Though can also continue that electricity generation system is made to be in normal using these existing methods for handling grid-connected line short fault
The state of operation, but exist and fail the disadvantages of short circuit current is limited in acceptable level rapidly, once system short-circuit is electric
Flowing larger, excessive short circuit current will make some important equipment in wind power-generating grid-connected side be damaged, especially and net side
Step-up transformer and switch etc. classes equipment；Existing technical method can consume the active power of system, to will affect power generation
The operation of machine；The capacity of short circuit of system also can be increasing；Short circuit current may will make the relay protection of certain generating sets
Device action makes unit excision operation, not can guarantee wind power plant unit thus and be in a kind of normal operating condition.It is more serious
Situation is and the short-circuit trend of net side may will affect grid side trend distribution, this is likely to result in loss difficult to the appraisal.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of band superconductive current limiters
Wind-electricity integration system, in the prior art combine superconductor technology, the short circuit current on grid-connected route is restricted to connect rapidly
The level received, and the shortcomings that high tc superconducting fault current limiter just compensates for traditional technology, the current limliting time is smaller than hundred Microsecond grades, from
And short circuit current big in power grid is avoided to constitute injury to the security and stability of power grid and electrical equipment, electricity can be greatly improved
The stability of net side and electricity generation system improves the reliability and safety of power generation.
When wind power generating set carries out grid-connected, especially most of middle-size and small-size offshore wind farms use high-voltage AC transmission
When carrying out grid-connected, it is possible that, if effectively cutting off short circuit current not in time, can be generated serious the case where short-circuit current
Consequence.With the appearance of superconductor and using the increasingly mature of technology, high tc superconducting fault current limiter will be as ideal
Current limiter is applied in wind-electricity integration, and it on the normal operation of power grid without influence.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of wind-electricity integration system with superconductive current limiter, the system include multiple wind power plant units, superconductive current limiter, often
A wind power plant unit after rectification variable-frequency device and conducting wire group with the side of collection bus row by being connected, the collection bus
The other side of row is successively connected after the superconductive current limiter, breaker and transformer with grid side in order.
Further, the superconductive current limiter is composed in parallel by superconductive element and current-limiting resistance, the superconductive element by
Iron-based superconducting material FeSe is made.
Further, the capacity of the wind power plant unit is 2000KW~2200KW, voltage class 35KV.
Further, the operating current of the breaker is 800A~850A.
Further, the conducting wire group uses power cable, the model YJV-35-630 of the power cable.
Further, it is connected between the transformer and grid side by trolley wire, the type of the trolley wire
Number be LJ-95 type copper core aluminum stranded conductor.
Further, the capacity of the transformer is 50MVA, transformation ratio 10.5.
Further, collection bus mining monolithic TMY copper bus-bar.
Further, the rectification variable-frequency device uses IGBT module, the current class of the IGBT module be 270A~
350A。
Compared with prior art, the invention has the following advantages that
(1) failure removal speed is fast, and the present invention devises the high tc superconducting fault current limiter under a kind of based superconductive material in wind
Electricity and application when network short circuit fault, realize the detection to wind power-generating grid-connected route, and when occur in grid-connected route compared with
After high-grade short trouble, the short circuit current of higher level can be limited in specified electricity in hundred Microsecond grades by high tc superconducting fault current limiter
Stream guarantees the reliable and quality of grid-connected power generation, efficiently solves traditional wind so as to efficiently cut off short-circuit current in time
Can make possessed by generic failure current limiter used by the grid-connected route of electricity power equipment increased costs, quality of generating electricity by way of merging two or more grid systems it is low,
The deficiencies of stability of power system weakens place.And high tc superconducting fault current limiter is used for Oversea wind power generation and land wind-power electricity generation
It is grid-connected in, using its can rapidly by the short-circuit current occurred in route be limited in insulation of electrical installation level under, and
And high tc superconducting fault current limiter integrates detection, triggering and current limliting.When occurring short-circuit current, high-temperature superconductor in grid-connected route
Current limiter can react rapidly, and short circuit current is limited within rated current, and switch off time is extremely short, and it is micro- to can reach hundred
The level of second grade；When normal operation, consume is very low, and the influence to the active power and reactive power of generating set is also very low,
And it can automatically reset, and overcome the characteristics of fuse is used only once in conventional line.High tc superconducting fault current limiter installation
In wind-electricity integration, it will realize the through-flow and efficient current limliting of low-loss, wind farm grid-connected safety, reliability and height can be enhanced
It is qualitative, improve grid-connected quality.High tc superconducting fault current limiter can be simultaneous with existing wind-electricity integration protection facility and entire generating equipment
Hold, can increase the flexibility of system by adjusting the current peak allowed, reduce line short device and fuse in wind power system
Use, the update of power equipment can be delayed, improve working capacity of system etc., therefore high tc superconducting fault current limiter wind by land
Application during power power generation and offshore wind farm are grid-connected can bring huge economic benefit.
(2) highly reliable, the present invention devises the high tc superconducting fault current limiter under a kind of based superconductive technology in wind-electricity integration
Application when short trouble, compared with when traditional wind power-generating grid-connected to the processing method of short trouble, having rapidly will be short
Road current peak is limited in the acceptable level of electrical equipment, the detection of short trouble collection, triggering and the limit occurred when will be grid-connected
The advantages that flowing Yu Yiti, greatly enhancing wind farm grid-connected safety, reliability, and improve whole system efficient operation.
Detailed description of the invention
Fig. 1 is overall system architecture schematic diagram of the invention.
Specific embodiment
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 description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work
Example is applied, all should belong to the scope of protection of the invention.
Embodiment
It is as shown in Figure 1 the overall system architecture schematic diagram of the corresponding embodiment of technical solution of the present invention, which includes
Multiple wind power plant units, superconductive current limiter, each wind power plant unit after rectification variable-frequency device and conducting wire group with collection bus by arranging
Side be connected, collection bus row the other side in order successively after superconductive current limiter, breaker and transformer with electricity
Net side is connected.
Because superconductor has the conversion characteristic of normal-superconducting state, resistance is zero not consume electricity under its superconduction transition
Can, when the short-circuit current occurred in grid-connected route is greater than the critical current I of superconductorc, when, superconductor quenches appearance
Big resistance is to limiting short-circuit current, and after fault current disappears, supercurrent can automatically reset.Its normal-superconducting state turns
Become the time less than hundred microseconds, it is minimum to open short time t, different from current-limting fuse or LC resonance circuit is made to take off humorous Deng current-limiting methods
The variation for needing to realize conduction state by mechanical action, so high tc superconducting fault current limiter will be most ideal reliable failure
Current limiter.
The present embodiment is using turn using the superconductor in high tc superconducting fault current limiter with " normal-superconducting state "
Become characteristic, it is acceptable the short-circuit current of 50KA or 63KA or more rapidly, efficiently can be limited in electrical equipment
Level, and it will integrate detection, triggering and current limliting, there is the function of realizing the through-flow and efficient current limliting of low-loss, Neng Gouti
The reliability service of high wind power generating set and the quality generated electricity by way of merging two or more grid systems.
Wind-electricity integration is a most important part in wind generator system, and to be likely to occur in grid-connected route compared with
Big peak value of short is limited, and economy to system safe and stable operation, personal safety and wind power plant and suffers from decision
The effect of property.The invention patent, which is realized, carries out current limliting, detection to the short-circuit current being likely to occur in wind-electricity integration route
With the fast operating of triggering and the real-time monitoring of the grid-connected route operating status of realization, reduce brought by grid-connected line fault
Economic loss and personal safety influence.
In conjunction with Fig. 1, the specific design selection process in the present embodiment is as follows:
The selection of one, transformer parameter:
The capacity of step-up transformer uses 50MVA；
Because it is that 35kV boosts to 110kV, transformation ratio U that step-up transformer, which is from voltage class,k%=
10.5；
The calculating of two, breaking currents:
Assuming that short dot occurs between high-temperature superconductor current-limiting apparatus and collection bus row, step-up transformer capacity is
50MVA, transformation ratio Uk%=10.5, so that
The reactance of route are as follows:
XL=Rl=20 × 0.44=8.8 Ω
Total reactance are as follows:
XKΣ==XL+XT=8.8+0.21=9.01 Ω
Therefore short circuit current are as follows:
Short circuit current subtranient value are as follows:
The electric current passed through in overhead transmission line when normal work is 830A.
The size of busbar sectional area in three .35kV high-tension switch cabinets:
According to the calculating principle of busbar sectional area:
S==I/ α * 5 (t/ Δ θ)
Therefore it can determine its sectional area S=20 × 10.49=210mm2；It is specific if selecting model 20KA/4S
Size is 50 × 5mm2；
Using monolithic TMY copper bus-bar, according to the size of its current-carrying capacity, the size model number of big level-one is usually selected, tabling look-up can
Know that its specification is 50 × 6mm2。
The model of four, high-voltage circuitbreakers:
Electric current when due to working normally is 830A, according to the circuit breaker of Schneider company, model are as follows:
ZW7-40.5/1600A-31.5；
The sectional area size of five, transmission lines of electricity:
This section from high-voltage frequency converter to busbar uses power cable, cable model YJV-35-630 apart from us；
Grid-connected route uses overhead transmission line, overhead transmission line model LJ-95 type copper core aluminum stranded conductor.
Type selecting in six, frequency converters:
The selection principle of IGBT module:
Because the capacity of single wind-force hair blower is 2000KW, voltage class 35kV, if single duty ratio is 0.4,
The actual current then calculated are as follows:
I=2000/35/0.4=142A
It generally doubles to choose, so that electric current is 300A, then selects the product type of company, Infineon to be
The IGBT module of FF1200R121E5D.
The selection of seven, superconductor materials:
With the fast development of superconductor technology in recent years, to base superconductor FeSeResearch also obtained huge advance,
Transition temperature can achieve between 15.2K to 37K, and one series of products have: KxFe2Se2、AxNH3FeSe、LiOHFeSeAnd now
The manufacturing method of product is not limited in high-temperature sintering process, and there are also liquid ammonia process for caustic soda purification, hydro-thermal method and solvent methods etc..
Wherein K0.8Fe2Se2The transition temperature of superconductor can be usually reached 30K, and highest can achieve 44K；
K0.8Fe1.7Se244K can be reached under conditions of 12.5GPa, this there will be better current limiting capacity.
The permission maximum temperature of national regulations carrying object should not be greater than 1000 degree, if temperature rise must in short circuit
Superelevation specified value, in this way we using " normal-superconducting state " of superconductor conversion characteristic, so that it may as caused by short circuit
Influence be reduced to specified value hereinafter, this by equipment fuel factor and dynamic effect have important role.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (9)
1. a kind of wind-electricity integration system with superconductive current limiter, which is characterized in that the system includes multiple wind power plant units, superconduction
Current limiter, each wind power plant unit are connected by the side arranged after rectification variable-frequency device and conducting wire group with collection bus, institute
The other side for stating collection bus row is successively connected after the superconductive current limiter, breaker and transformer with grid side in order
It connects.
2. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the superconduction
Current limiter is composed in parallel by superconductive element and current-limiting resistance, and the superconductive element is made of iron-based superconducting material FeSe.
3. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the wind-powered electricity generation
The capacity of field unit is 2000KW~2200KW, voltage class 35KV.
4. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the open circuit
The operating current of device is 800A~850A.
5. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the conducting wire
Group uses power cable, the model YJV-35-630 of the power cable.
6. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the transformation
It is connected between device and grid side by trolley wire, the model LJ-95 type copper core aluminum stranded conductor of the trolley wire.
7. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the transformation
The capacity of device is 50MVA, transformation ratio 10.5.
8. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that described collects
Bus bar uses monolithic TMY copper bus-bar.
9. a kind of wind-electricity integration system with superconductive current limiter according to claim 1, which is characterized in that the rectification
Frequency converter uses IGBT module, and the current class of the IGBT module is 270A~350A.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600286A (en) * | 2020-06-18 | 2020-08-28 | 中国能源建设集团广东省电力设计研究院有限公司 | Coordination control method for superconducting current limiter and direct current breaker |
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