CN108667081A - A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using reactive power mode of priority - Google Patents
A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using reactive power mode of priority Download PDFInfo
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- CN108667081A CN108667081A CN201810449269.6A CN201810449269A CN108667081A CN 108667081 A CN108667081 A CN 108667081A CN 201810449269 A CN201810449269 A CN 201810449269A CN 108667081 A CN108667081 A CN 108667081A
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- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H02J3/386—
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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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- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The present invention proposes a kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using reactive power mode of priority, during grid voltage sags, using the preferential pattern of reactive power, reactive current is first calculated, control electrical excitation synchronous generator sends out reactive current iq；Then frequency converter torque instruction is calculated, according to the wind speed round at grid voltage sags moment, judges whether to reduce frequency converter torque instruction during grid voltage sags.The present invention makes the unit send out the reactive current of three times rated current during grid voltage sags, is effectively supported to network voltage；On the basis of ensureing above-mentioned reactive current, maximum allowed current in short-term, during grid voltage sags, watt current is made to maximize, realizes and network voltage is carried out to support and improve pitch-controlled system load to greatest extent.
Description
Technical field
The present invention relates to wind power generating set fields, more particularly to a kind of to be used for self-styled closed form electromagnetic coupling speed governing wind turbine
The control method of group.
Background technology
As shown in Figure 1, self-styled closed form electromagnetic coupling speed governing Wind turbines are joined using self-styled closed form electromagnetic coupling speed regulation device
High speed shaft of gearbox and electrical excitation synchronous generator rotor axis are connect, makes power from 2 side of gear-box to electrical excitation synchronous generator pusher side
It transmits, and network interface is electrical excitation synchronous generator 5；Self-styled closed form electromagnetic coupling speed regulation device is by electromagnetic coupler 4, frequency converter
6 and magneto alternator 3 form, magneto alternator 3 for give frequency converter 6 power；Electromagnetic coupler 4 has two to turn
Axis is connected with gear-box 2 and electrical excitation synchronous generator 5 and all rotates respectively, and frequency converter 6 controls electromagnetic coupler 4 two and turns
The relative rotation speed and electromagnetic torque of axis；The high speed shaft of gear-box and electromagnetic coupler axis, which are connected, constitutes preceding shafting, electromagnetism
Another axis of coupler is connected with the armature spindle of electrical excitation synchronous generator 5 constitutes rear axle mechanism, and forward and backward shafting is 2 independences
Shafting, coaxial realize of magneto alternator 3 and preceding shafting power to the frequency converter 6.
When power grid breaks down, network voltage falls and exceeds normal range (NR), self-styled closed form electromagnetic coupling speed governing
The existing control strategy of Wind turbines proceeds to low voltage crossing control model, since frequency converter is by same with high speed shaft of gearbox
The magneto alternator of axis is powered, and falling for network voltage will not have an impact the power supply of frequency converter, in order to keep unit
Output watt current is constant, frequency converter torque instruction value Tcmd_LVRTCalculation formula be：
Tcmd_LVRT=kTcmd (1)
In formula, k is the perunit value of network voltage, TcmdFor grid voltage sags moment frequency converter torque instruction value, the frequency conversion
Device torque instruction value is acquired by the optimal mechanical characteristic of self-styled closed form electromagnetic coupling speed governing Wind turbines wind wheel, propeller pitch angle
Seek with network voltage it is normal when it is identical, acquired using pi regulator according to wind speed round desired value and measured value.
But when existing control strategy is there is no electric network fault is considered, influence of the wind speed to system, TcmdFor self-styled closed form electricity
By the obtained frequency converter torque instruction value of the optimal mechanical characteristic of wind wheel, wind when magnetic coupling speed governing Wind turbines are run substantially
Bigger, the T of speedcmdBigger, wind speed is smaller, TcmdIt is smaller.Due to △ Tcmd=(1-k) Tcmd, therefore, wind speed is bigger, △ TcmdIt is bigger,
Wind speed is smaller, △ TcmdIt is smaller, △ TcmdIt is that pitch-controlled system needs the load born, pitch-controlled system includes wind turbine wind wheel and attached
The motor for variable pitch, △ TcmdIt is bigger, the service life of wind wheel and pitch motor can be affected greatly.
Currently, there is no consider wind speed to frequency converter turn in electric network fault for self-styled closed form electromagnetic coupling speed governing Wind turbines
The influence of square command value, therefore, when pitch-controlled system bear load it is larger when, the service life of pitch-controlled system can be had an impact.
Invention content
To solve above-mentioned the deficiencies in the prior art, the present invention proposes a kind of self-styled closed form electricity of reactive power mode of priority
Magnetic coupling speed governing Wind turbines control method.
The technical proposal of the invention is realized in this way：
A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using reactive power mode of priority, using certainly
Enclosed type electromagnetic coupling speed regulation device connection gear box high speed shaft and electrical excitation synchronous generator rotor axis, make power from gear-box
Lateral electrical excitation synchronous generator pusher side transmits, and network interface is the electrical excitation synchronous generator；The self-styled closed form electromagnetism coupling
It closes speed regulation device to be made of electromagnetic coupler, frequency converter and magneto alternator, magneto alternator is used for frequency conversion
Device is powered；The electromagnetic coupler has two shafts, is connected with gear-box and electrical excitation synchronous generator and all rotates respectively, becomes
Frequency device controls the relative rotation speed and electromagnetic torque of two shafts of electromagnetic coupler；
During grid voltage sags, using the preferential pattern of reactive power, reactive current is first calculated, reactive current calculates such as
Under：
iq=3irated
iratedFor rated current, that is, the reactive current support network voltage of three times rated current is sent out, control electrical excitation is same
Step generator sends out above-mentioned reactive current iq；
Then frequency converter torque instruction is calculated according to the wind speed round at grid voltage sags moment to be judged whether in power grid
Reduce frequency converter torque instruction during Voltage Drop.
Optionally, when the wind speed round when network voltage falls is less than perunit value t,
Watt current isKB limit, that is, maximum allowable watt current value ismaxIt calculates as follows：
imaxIt is grid-connected electrical excitation synchronous generator maximum allowed current value in short-term；
If is≤ismax, keep the watt current i at grid voltage sags momentsIt is constant, frequency converter torque instruction value
Tcmd_LVRTCalculation formula is：
Tcmd_LVRT=kTcmd (1)
If is>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
TCmd_LVRT=Tcmd*(ismax/is) (2)
In formula, isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdFor network voltage
Fall moment frequency converter torque instruction value.
Optionally, when the wind speed round when network voltage falls is more than or equal to perunit value t, watt current is
KB limit, that is, maximum allowable watt current value ismaxIt calculates as follows：
imaxIt is grid-connected electrical excitation synchronous generator maximum allowed current value in short-term；
If is/k≤ismax, keep grid voltage sags before frequency converter torque instruction do not change, TCmd_LVRT=Tcmd；
If is/k>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
TCmd_LVRT=Tcmd*(ismax/is) (3)
isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdFor grid voltage sags
Moment frequency converter torque instruction value.
The beneficial effects of the invention are as follows：
(1) unit is made to send out the reactive current of three times rated current during grid voltage sags, to network voltage into
Row effectively support；
(2) ensureing that above-mentioned reactive current, maximum allowed current (ensures that short-time current does not transfinite i.e. generator peace in short-term
Row for the national games) on the basis of, during grid voltage sags, watt current is made to maximize, realizes and network voltage is carried out to greatest extent
Support (considering from network voltage support angle) and improvement pitch-controlled system load are (from reduction pitch-controlled system and entire rack load angle
Degree considers).
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.
Fig. 1 is the principle schematic of self-styled closed form electromagnetic coupling speed governing Wind turbines；
Fig. 2 is the flow chart of the control method 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, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The control strategy of existing self-styled closed form electromagnetic coupling speed governing Wind turbines does not consider wind in electric network fault
Influence of the speed to frequency converter torque instruction value, therefore, when pitch-controlled system bear load it is larger when, can to pitch-controlled system use the longevity
Life has an impact.
The present invention proposes a kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control using reactive power mode of priority
Method processed considers that wind speed on the load bearing influence of pitch-controlled system, realizes the protection to pitch-controlled system.
The control method of the present invention is used for self-styled closed form electromagnetic coupling speed governing Wind turbines as shown in Figure 1 in electric network fault
The control of period during grid voltage sags, using the preferential pattern of reactive power, first calculates reactive current, reactive-current meter
It calculates as follows：
iq=3irated
iratedFor rated current, that is, the reactive current support network voltage of three times rated current is sent out, control electrical excitation is same
Step generator sends out above-mentioned reactive current iq；
Then frequency converter torque instruction is calculated：
Watt current isKB limit, that is, maximum allowable watt current value ismaxIt calculates as follows：
imaxIt is grid-connected electrical excitation synchronous generator maximum allowed current value in short-term；
According to the wind speed round at grid voltage sags moment, judge whether that reducing frequency converter during grid voltage sags turns
Square instructs, and deterministic process is specific as follows：
When the wind speed round that network voltage falls the moment is less than perunit value t, (t turns for practical wind speed round/wind wheel
Fast rated value, for example, wind speed round rated value be 17.4rpm), illustrate that current wind speed is smaller, current unit active power of output compared with
It is small；
If is≤ismax, keep the watt current i at grid voltage sags momentsIt is constant, frequency converter torque instruction value
Tcmd_LVRTCalculation formula is：
Tcmd_LVRT=kTcmd (1)
If is>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
TCmd_LVRT=Tcmd*(ismax/is) (2)
In formula, isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdFor network voltage
Fall moment frequency converter torque instruction value.
When wind speed round when network voltage falls is more than or equal to t, illustrate that current wind speed is larger, current wind
Motor group active power of output is larger, TcmdIt is larger, if still according to kTcmdFrequency converter torque during calculating grid voltage sags
Instruction, then torque change △ TcmdLarger, wind wheel hypervelocity, pitch-controlled system must be with fast speed featherings in order to prevent；
If is/k≤ismax, keep grid voltage sags before frequency converter torque instruction do not change, Tcmd_LVRT=
Tcmd；
If is/k>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
Tcmd_LVRT=Tcmd*(ismax/is) (3)
isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdFor grid voltage sags
Moment frequency converter torque instruction value.
In conventional power plant, synchronous generator can send out up to three times rated current during network voltage falls
Reactive current network voltage is effectively supported, due to the present invention Wind turbines and network interface also be electrical excitation synchronize hair
Motor, therefore the synchronous generator in conventional power plant is simulated, so that the unit is sent out the specified electricity of three times during grid voltage sags
The reactive current of stream effectively supports network voltage；
Ensureing that above-mentioned reactive current, maximum allowed current (ensures that short-time current does not transfinite i.e. engine health in short-term
Operation) on the basis of, during grid voltage sags, control method of the invention makes watt current maximize, and realizes to power grid electricity
Pressure carry out support to greatest extent (considering from network voltage support angle) and improve pitch-controlled system load (from reduce pitch-controlled system with
Entire rack load angle considers).
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (3)
1. a kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using reactive power mode of priority, use is self-styled
Closed form electromagnetic coupling speed regulation device connection gear box high speed shaft and electrical excitation synchronous generator rotor axis, make power from gear box side
It is transmitted to electrical excitation synchronous generator pusher side, and network interface is the electrical excitation synchronous generator；The self-styled closed form electromagnetic coupling
Speed regulation device is made of electromagnetic coupler, frequency converter and magneto alternator, and magneto alternator is used for frequency converter
Power supply；The electromagnetic coupler has two shafts, is connected and all rotates, frequency conversion with gear-box and electrical excitation synchronous generator respectively
Device controls the relative rotation speed and electromagnetic torque of two shafts of electromagnetic coupler；It is characterized in that,
During grid voltage sags, using the preferential pattern of reactive power, reactive current is first calculated, reactive current calculates as follows：
iq=3irated
iratedFor rated current, that is, the reactive current support network voltage of three times rated current is sent out, control electrical excitation synchronizes hair
Motor sends out above-mentioned reactive current iq；
Then frequency converter torque instruction is calculated according to the wind speed round at grid voltage sags moment to be judged whether in network voltage
Reduce frequency converter torque instruction during falling.
2. a kind of self-styled closed form electromagnetic coupling speed governing Wind turbines using reactive power mode of priority as described in claim 1
Control method, which is characterized in that when the wind speed round when network voltage falls is less than perunit value t,
Watt current isKB limit, that is, maximum allowable watt current value ismaxIt calculates as follows：
imaxIt is grid-connected electrical excitation synchronous generator maximum allowed current value in short-term；
If is≤ismax, keep the watt current i at grid voltage sags momentsIt is constant, frequency converter torque instruction value Tcmd_LVRTMeter
Calculating formula is：
Tcmd_LVRT=kTcmd (1)
If is>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
TCmd_LVRT=Tcmd*(ismax/is) (2)
In formula, isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdFor grid voltage sags
Moment frequency converter torque instruction value.
3. a kind of self-styled closed form electromagnetic coupling speed governing Wind turbines using reactive power mode of priority as described in claim 1
Control method, which is characterized in that active when the wind speed round when network voltage falls is more than or equal to perunit value t
Electric current isKB limit, that is, maximum allowable watt current value ismaxIt calculates as follows：
imaxIt is grid-connected electrical excitation synchronous generator maximum allowed current value in short-term；
If is/k≤ismax, keep grid voltage sags before frequency converter torque instruction do not change, Tcmd_LVRT=Tcmd；
If is/k>ismax, frequency converter torque instruction Tcmd_LVRTCalculation formula is：
Tcmd_LVRT=Tcmd*(ismax/is) (3)
isFor the watt current at grid voltage sags moment, k is the perunit value of network voltage, TcmdBecome for the grid voltage sags moment
Frequency device torque instruction value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810449269.6A CN108667081B (en) | 2018-05-11 | 2018-05-11 | Self-closed electromagnetic coupling speed regulation wind turbine generator control method adopting reactive power priority mode |
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| CN201810449269.6A CN108667081B (en) | 2018-05-11 | 2018-05-11 | Self-closed electromagnetic coupling speed regulation wind turbine generator control method adopting reactive power priority mode |
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| CN108667081B CN108667081B (en) | 2020-04-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155356A (en) * | 2011-03-22 | 2011-08-17 | 国电联合动力技术有限公司 | Method for controlling running of wind generating set based on speed-regulating front end of electromagnetic coupler |
| CN103094917A (en) * | 2012-11-27 | 2013-05-08 | 哈电通用风能（江苏）有限公司 | Low voltage ride through control method for full-power high-speed permanent synchronous fan |
| US20130134709A1 (en) * | 2011-11-30 | 2013-05-30 | Iqwind Ltd. | Wind Turbine With Variable Speed Auxiliary Generator and Load Sharing Algorithm |
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2018
- 2018-05-11 CN CN201810449269.6A patent/CN108667081B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155356A (en) * | 2011-03-22 | 2011-08-17 | 国电联合动力技术有限公司 | Method for controlling running of wind generating set based on speed-regulating front end of electromagnetic coupler |
| US20130134709A1 (en) * | 2011-11-30 | 2013-05-30 | Iqwind Ltd. | Wind Turbine With Variable Speed Auxiliary Generator and Load Sharing Algorithm |
| CN103094917A (en) * | 2012-11-27 | 2013-05-08 | 哈电通用风能（江苏）有限公司 | Low voltage ride through control method for full-power high-speed permanent synchronous fan |
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