CN104779639B - A kind of converter system and double-feedback aerogenerator group - Google Patents
A kind of converter system and double-feedback aerogenerator group Download PDFInfo
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- CN104779639B CN104779639B CN201510176889.3A CN201510176889A CN104779639B CN 104779639 B CN104779639 B CN 104779639B CN 201510176889 A CN201510176889 A CN 201510176889A CN 104779639 B CN104779639 B CN 104779639B
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Classifications
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- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/007—Control circuits for doubly fed generators
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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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- Engineering & Computer Science (AREA)
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- Control Of Eletrric Generators (AREA)
Abstract
A kind of converter system and double-feedback aerogenerator group, converter system includes current transformer, stator breaker, rotor-side switchs and net side protective device, the rotor of supporting double-fed generator with converter system, the stator winding turn ratio is more than 1, current transformer machine-side converter connects the rotor windings of double-fed generator, grid side converter connects the electric Rendezvous Point of rotor branch, stator breaker is connected between the stator winding of double-fed generator and the electric Rendezvous Point of rotor branch, net side protective device is connected between grid side converter and the electric Rendezvous Point of rotor branch, rotor-side switch is connected between machine-side converter and double-fed generator rotor windings；Double-feedback aerogenerator group includes tower, wind turbine, gear-box, double-fed generator, transformer, vane change device, master controller and above-mentioned converter system.The present invention reduces existing converter system and whole wind power generating set construction cost, improves system economy；It is safe and reliable to operation, it is easy to use.
Description
Technical field
The present invention relates to a kind of converter system for wind-power electricity generation, further relates to the double-fed type using the converter system
Wind power generating set.
Background technology
As cleaning, new energy that is renewable, having great potential, wind-power electricity generation obtains rapidly in worldwide
Development.MW class wind turbine group mainly has double-feedback aerogenerator group and total power formula wind power generating set.Such as Fig. 1
Shown, double-feedback aerogenerator group is mainly by tower (not shown), wind turbine, gear-box, double-fed generator and current transformer
System, transformer, vane change device and master controller etc. form.Wherein, the external electrical network of transformer primary side's connection high pressure, secondary Fang Lian
The internal electric network of low pressure is connect, double-fed generator and converter system are to realize machine between wind turbine, gear-box and internal electric network
Electric energy conversion and the core system of control.
It is illustrated in figure 2 existing double-fed generator and converter system.The armature spindle of double-fed generator and wind turbine, gear
Case mechanically connects, and receives mechanical energy, stator winding, rotor windings can feed electric energy；Converter system generally comprises current transformer,
Net side fuse FU2, stator contactor K1 and stator circuit breaker Q F1.Wherein current transformer is included is electrically connected by dc bus
Machine-side converter and grid side converter, be responsible for processing doubly-fed generation machine rotor branch on power.The stator of double-fed generator
Winding is connected to the electric Rendezvous Point of rotor branch by stator contactor K1 and stator circuit breaker Q F1, and double-fed generator
Rotor windings then need to be connected to the electric Rendezvous Point of rotor branch by current transformer, and the electric Rendezvous Point of rotor branch is positioned at double
The internal electric network of feedback formula wind power generating set.Usually, the range of speeds of double-fed generator normal operation is the 0.8 of synchronous rotational speed
To between 1.2 times, i.e., between slip is 0.2 to -0.2, the range of speeds of limit operation is 0.67 to the 1.33 of synchronous rotational speed
Between times, i.e., between slip is 0.33 to -0.33.According to the power relation characteristic of double-fed generator, i.e. rotor processing power
The absolute value of slip is run for it with the ratio of stator processing power, therefore converter subsystem maximum power to be treated is
1/4 or so of system total power.Meanwhile the rotor port voltage of double-fed generator and the ratio of stator voltage, it is rotor windings
With the no-load voltage ratio of stator winding and the product of the absolute value of double-fed generator actual motion slip.The rotor of general double-fed generator
The no-load voltage ratio of winding and stator winding is 3:1 or so.It is in this way, (right on the range of speeds border of the limit operation of double-fed generator
Answer the absolute value of slip to be generally 0.33), the rotor port voltage of double-fed generator and the ratio of stator voltage near 1,
I.e. rotor port voltage is suitable with the numerical value of stator voltage, that is, internal electric network voltage at this time.Usual internal electric network is configured to rated value
For the alternating current of 690V, in this way, the voltage of processing is all at 690V grades needed for machine-side converter and grid side converter in current transformer
Not.Above-mentioned design, has fully demonstrated economic sexual clorminance of the double-feedback aerogenerator group relative to total power wind power generating set.
Above-mentioned existing converter system is when double-feedback aerogenerator group is shut down, the stator contactor on stator branch
K1 and stator circuit breaker Q F1 at least one of which must disconnect, otherwise by the double-fed generator institute being connected in internal electric network
The high rotor voltage that the large-slip state (slip 1) at place triggers is applied directly to converter subsystem, meeting (up to 2100V)
Converter subsystem is damaged, or even more serious accident occurs.Because the wind behaviour fluctuation of part wind power plant is more frequent, this
Wind power generating set can be caused frequently to open machine, shut down, and often there are limited mechanically and electrically action by stator circuit breaker Q F1
Number limits, therefore defencive function when stator circuit breaker Q F1 generally mainly undertakes the system failure and maintenance, and stator contactor K1
Then undertake wind power generating set normally open machine, shut down when closure, opening operation (dash current is often little at this time).Because of contact
The action frequency limitation of device can be higher by more than an order of magnitude than breaker, can so ensure the projected life of system.
Above-mentioned existing converter system is widely used in wind-powered electricity generation industry, but stator contactor K1 therein,
Since its rated current is larger, industrially overall dosage is smaller, and production cost is often higher, have impact on converter system or even
The economy of whole double-feedback aerogenerator group.By taking 2.0MW double-fed generators and converter system as an example, generally need to use
The stator contactor of 2100A, its price is at present about more than 30,000 yuans, and low current contactor is with respect to high current
The action frequency limitation of contactor can higher.
The content of the invention
One of the technical problem to be solved in the present invention is, there is provided a kind of converter system, overcomes existing stator contactor
It is of high cost, the defects of influencing converter system or even whole wind power generating set economy.
The second technical problem to be solved by the present invention is, there is provided a kind of double-feedback aerogenerator group, it is existing fixed to overcome
Sub- contactor is of high cost, the defects of influencing wind power generating set economy.
Technical solution is used by the present invention solves one of its technical problem：A kind of converter system is constructed, including is become
Flow device and net side protective device；
The current transformer includes the machine-side converter and grid side converter connected by dc bus, machine-side converter connection
The rotor windings of double-fed generator, the grid side converter connection electric Rendezvous Point of rotor branch；
The net side protective device is connected between the grid side converter and the electric Rendezvous Point of rotor branch；
The turn ratio of the rotor windings of supporting double-fed generator and stator winding is more than 1 with the converter system；
It is characterized in that, the converter system further includes stator side breaker and rotor-side switch；
The stator side breaker be connected between the stator winding of double-fed generator and the electric Rendezvous Point of rotor branch and
Closure state is maintained during double-fed generator orderly closedown；
Rotor-side switch is connected between machine-side converter and the rotor windings of double-fed generator and in double-fed generator
Opening operation is performed during orderly closedown；
The rotor-side switch is contactor or thyristor switch.
In the converter system of the present invention, the net side protective device is breaker or fuse.
In the converter system of the present invention, including capacitance group, the capacitance group are delta connection or star connection, are connected
It is connected on the three-phase line between the stator winding of the stator side breaker and double-fed generator.
Technical solution is used by the two of its technical problem of present invention solution：Construct a kind of double-feedback aerogenerator
Group, including tower, wind turbine, gear-box, double-fed generator, converter system, transformer, vane change device and master controller；This pair
The turn ratio of the rotor windings and stator winding of presenting generator is more than 1；The converter system includes current transformer and net side protective device；
The current transformer includes the machine-side converter and grid side converter connected by dc bus, machine-side converter connection doubly-fed generation
The rotor windings of machine, the grid side converter connection electric Rendezvous Point of rotor branch；
The net side protective device is connected between the grid side converter and the electric Rendezvous Point of rotor branch；
It is characterized in that, the converter system further includes stator side breaker and rotor-side switch；
The stator side breaker be connected between the stator winding of double-fed generator and the electric Rendezvous Point of rotor branch and
Closure state is maintained during double-fed generator orderly closedown；
Rotor-side switch is connected between machine-side converter and the rotor windings of double-fed generator and in double-fed generator
Opening operation is performed during orderly closedown；
The rotor-side switch is contactor or thyristor switch.
In the double-feedback aerogenerator group of the present invention, the net side protective device is breaker or fuse.
In the double-feedback aerogenerator group of the present invention, including capacitance group, the capacitance group are delta connection or star
Shape connection, is connected on the three-phase line between the stator winding of the stator side breaker and double-fed generator.
Implement the converter system and double-feedback aerogenerator group of the present invention, compared with the prior art, its advantage
It is：
1. for double-feedback aerogenerator group, the machine-side converter of current transformer and doubly-fed generation in converter system
Rotor-side is set to switch between rotor windings, since current transformer maximum power to be treated is only 1/4 left side of system total power
The right side, therefore the switching current grade being arranged on dual feed wind generator rotor branch is much smaller than the stator for being arranged on double-fed generator
Switching current grade on branch, therefore the switch price of the invention for being arranged on generator amature side will be far below and be arranged on generator
Switch price on stator branch, so as to reduce the construction cost of existing converter system and whole wind power generating set, is improved
System economy；By taking 2.0MW converter systems as an example, the rotor contact of 630A can be used up to 520A in its rotor rated current
Device, its price is at present at 0.5 ten thousand yuan or so, and the price of the stator contactor for the 2100A that existing system generally uses is about 3
More than ten thousand yuan, and the action frequency limitation meeting higher of the relatively large contactor of low current contactor, therefore its economy is phase
When considerable；
2. system operation is safe and reliable, on the road when wind power generating set normally opens machine, shuts down by the rotor set
Rotor-side switchs the connecting and disconnecting for realizing current transformer and double-fed generator, then can be by stator breaker and net in system overhaul
Side protective device realization is safely disconnected with power grid, easy to use.
Brief description of the drawings
Fig. 1 is that double-feedback aerogenerator group forms structure diagram substantially.
Fig. 2 is the structure diagram that existing converter system adds double-fed generator.
Fig. 3 is the structure diagram that converter system of the present invention adds double-fed generator.
Fig. 4 is the structure diagram that converter system embodiment one of the present invention adds double-fed generator.
Fig. 5 is the structure diagram that converter system embodiment two of the present invention adds double-fed generator.
Fig. 6 is the structure diagram that converter system embodiment three of the present invention adds double-fed generator.
Embodiment
Below in conjunction with accompanying drawings and embodiments, the invention will be further described.
As shown in figure 3, the converter system of the present invention includes current transformer, stator breaker 10 (QF1), net side protective device
16 and rotor-side switch 12.The rotor windings of double-fed generator 100 supporting with the converter system and the turn ratio of stator winding
More than 1.
Current transformer includes the machine-side converter 13 and grid side converter 15 connected by dc bus 14, the machine-side converter
The rotor windings of 13 connection double-fed generators 100, grid side converter 15 connect the electric Rendezvous Point 11 of rotor branch.
Stator breaker 10 is connected to the stator winding of double-fed generator 100 and the rotor branch of double-fed generator 100
Between electric Rendezvous Point 11.
Net side protective device 16 is connected between grid side converter 15 and the electric Rendezvous Point 11 of rotor branch.
Rotor-side switch 12 is connected between the machine-side converter and the rotor windings of double-fed generator.
Embodiment one
As shown in figure 4, in the present embodiment, rotor-side switch 12 is using rotor contactor 121 (K2), net side protective device
16 using net side breaker 161.
By acting rotor contactor 121, it can reach and disappear in double-feedback aerogenerator group normally opens machine, stopping process
The high induction voltage that may trigger except dual feed wind generator large-slip state is to machine-side converter in double-feed current transformer and net side
The influence of converter, weakens the action demand to stator breaker 10.Because the action frequency limitation of contactor is generally far larger than
The action frequency limitation of breaker, so as to ensure the projected life of double-fed generator and converter system.
Certainly, also can be according to application characteristic (such as site wind during the orderly closedown of double-feedback aerogenerator group
Wind power plant of the relatively stable, wind power generating set without frequent start-stop) the stator breaker 10 is performed unconditionally every time
Opening operation；Or system can shut down the features such as frequency, downtime duration or breaker actuation number record according to actual
To the opening operation of 10 electing property of stator breaker.
In other embodiments, net side breaker 161 can be replaced using net side fuse 162.
Embodiment two
As shown in figure 5, in the present embodiment, rotor-side switch 12 using rotor contactor 121, adopt by net side protective device 16
With net side breaker 161.
In other embodiments, net side breaker 161 can be replaced using net side fuse 162.
The present embodiment is additionally provided with capacitance group 17, which uses star connection, be connected to stator breaker 10 with it is double
Present on the three-phase line between the stator winding of generator 100.
Capacitance group 17 is articulated on the three-phase line between the stator winding of stator breaker 10 and double-fed generator 100
Afterwards, the capacity current of generation is designed as suitable with double-fed generator stator side exciting current, can reach following technique effect：Wind
After power generator group orderly closedown, rotor contactor 121 is disconnected, stator breaker 10 can be kept to close, at this time double-fed generator
The capacity current basic neutralisation that can be produced by the capacitance group of the exciting current asked for of stator winding so that substantially not to outside
System produces additional effect.
In addition, after wind power generating set orderly closedown, it can also keep grid side converter to maintain operation, make its output a certain amount of
Capacitive reactive power electric current, all or part of capacity current for substituting above-mentioned capacitance group to produce, is equally used for offsetting double-fed generator
The exciting current asked for of stator winding.
In other embodiments, the capacitance group 17 of star connection can use the capacitance group of delta connection to replace.
Embodiment three
As shown in fig. 6, in the present embodiment, rotor-side switch 12 is using rotor thyristor switch 122, net side protective device
16 using net side fuse 162.
Since dual feed wind generator rotor branch current is usually 1/3 or so of stator side branch current, thus use by
The three-phase two-way switch of thyristor inverse parallel composition, the present embodiment can reach and technique effect as embodiment one kind and economic effect
Benefit.
In other embodiments, rotor-side switch 12 can use other can frequent movement switch.
In other embodiments, net side fuse 162 can be replaced using net side breaker 161.
In other embodiments, may also set up capacitance group, capacitance group uses star connection, be connected to stator breaker 10 with
On three-phase line between the stator winding of dual feed wind generator 100.
In other embodiments, the capacitance group of star connection can use the capacitance group of delta connection to replace.
The present invention double-feedback aerogenerator group include tower, wind turbine, gear-box, double-fed generator, converter system,
Transformer, vane change device and master controller.Tower, wind turbine, gear-box, double-fed generator, converter system, transformer, variable pitch
The connection relation of device and master controller is the prior art, and converter system uses the converter system of the invention described above, it is tied
Structure and its conversion are as above-mentioned, and details are not described herein.
Claims (8)
1. a kind of converter system, including current transformer and net side protective device；
The current transformer includes the machine-side converter and grid side converter connected by dc bus, machine-side converter connection double-fed
The rotor windings of generator, the grid side converter connection electric Rendezvous Point of rotor branch；
The net side protective device is connected between the grid side converter and the electric Rendezvous Point of rotor branch；
The turn ratio of the rotor windings of supporting double-fed generator and stator winding is more than 1 with the converter system；
It is characterized in that, the converter system further includes stator side breaker and rotor-side switch；
The stator side breaker is connected between the stator winding of double-fed generator and the electric Rendezvous Point of rotor branch and double
Closure state is maintained during feedback generator orderly closedown；
Rotor-side switch is connected between machine-side converter and the rotor windings of double-fed generator and normal in double-fed generator
Opening operation is performed in stopping process；
The rotor-side switch is contactor or thyristor switch.
2. converter system as claimed in claim 1, it is characterised in that the net side protective device is breaker or fusing
Device.
3. converter system as claimed in claim 1, it is characterised in that including capacitance group, which is delta connection
Or star connection, it is connected on the three-phase line between the stator winding of the stator side breaker and double-fed generator.
4. converter system as claimed in claim 2, it is characterised in that including capacitance group, which is delta connection
Or star connection, it is connected on the three-phase line between the stator winding of the stator side breaker and double-fed generator.
5. a kind of double-feedback aerogenerator group, including tower, wind turbine, gear-box, double-fed generator, converter system, transformation
Device, vane change device and master controller；The rotor windings of the double-fed generator and the turn ratio of stator winding are more than 1；The current transformer system
System includes current transformer and net side protective device；The current transformer includes the machine-side converter connected by dc bus and net side converts
Device, the machine-side converter connect the rotor windings of double-fed generator, the grid side converter connection electric Rendezvous Point of rotor branch；
The net side protective device is connected between the grid side converter and the electric Rendezvous Point of rotor branch；
It is characterized in that, the converter system further includes stator side breaker and rotor-side switch；
The stator side breaker is connected between the stator winding of double-fed generator and the electric Rendezvous Point of rotor branch and double
Closure state is maintained during feedback generator orderly closedown；
Rotor-side switch is connected between machine-side converter and the rotor windings of double-fed generator and normal in double-fed generator
Opening operation is performed in stopping process；
The rotor-side switch is contactor or thyristor switch.
6. double-feedback aerogenerator group as claimed in claim 5, it is characterised in that the net side protective device is breaker
Or fuse.
7. double-feedback aerogenerator group as claimed in claim 5, it is characterised in that including capacitance group, which is three
Angular connection or star connection, the triple line being connected between the stator winding of the stator side breaker and double-fed generator
Lu Shang.
8. double-feedback aerogenerator group as claimed in claim 6, it is characterised in that including capacitance group, which is three
Angular connection or star connection, the triple line being connected between the stator winding of the stator side breaker and double-fed generator
Lu Shang.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510176889.3A CN104779639B (en) | 2015-04-15 | 2015-04-15 | A kind of converter system and double-feedback aerogenerator group |
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| CN201510176889.3A CN104779639B (en) | 2015-04-15 | 2015-04-15 | A kind of converter system and double-feedback aerogenerator group |
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| CN104779639B true CN104779639B (en) | 2018-04-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979848A (en) * | 2015-06-11 | 2015-10-14 | 深圳市长昊机电有限公司 | Converter system and double-fed wind turbine generator set shutdown method |
| CN108899938B (en) * | 2018-09-06 | 2024-03-15 | 运达能源科技集团股份有限公司 | Double-fed wind generating set |
| CN111900739B (en) * | 2019-05-05 | 2022-08-12 | 维谛新能源有限公司 | Bus voltage control method, system and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201332277Y (en) * | 2008-12-24 | 2009-10-21 | 华锐风电科技有限公司 | Transducer redundant system of large scale wind generating set |
| CN101931240A (en) * | 2010-08-26 | 2010-12-29 | 哈尔滨九洲电气股份有限公司 | Double-PWM vector control double-fed wind power converter |
| CN103580055A (en) * | 2012-07-18 | 2014-02-12 | 上海寰晟新能源科技有限公司 | Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method |
| CN103840479B (en) * | 2013-12-16 | 2016-09-14 | 南方电网科学研究院有限责任公司 | A kind of AC-DC hybrid transmission system based on VSC-HVDC starts control method |
| CN204578110U (en) * | 2015-04-15 | 2015-08-19 | 深圳市长昊机电有限公司 | A kind of converter system and double-feedback aerogenerator group |
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Effective date of registration: 20200811 Address after: Room 609, west block, 6 / F, Tian'an Innovation Technology Plaza (phase II), intersection of Binhe Road and Xiangmihu Road, Tian'an community, Shatou street, Futian District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN HOPEWIND ELECTRIC Co.,Ltd. Address before: 6 A2 District, 1 Yanshan Avenue, Yan Chuan community, Songgang street, Baoan District, Shenzhen, Guangdong 518000, China Patentee before: SHENZHEN CHANGHAO MECHANICAL AND ELECTRICAL Co.,Ltd. |