CN108063454A - A kind of super capacitor energy-storage control method for promoting double-fed fan motor function power - Google Patents
A kind of super capacitor energy-storage control method for promoting double-fed fan motor function power Download PDFInfo
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- CN108063454A CN108063454A CN201711296741.9A CN201711296741A CN108063454A CN 108063454 A CN108063454 A CN 108063454A CN 201711296741 A CN201711296741 A CN 201711296741A CN 108063454 A CN108063454 A CN 108063454A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 74
- 238000004146 energy storage Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001737 promoting effect Effects 0.000 title claims abstract description 5
- 230000007659 motor function Effects 0.000 title description 2
- 230000001052 transient effect Effects 0.000 claims abstract description 20
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 230000000977 initiatory effect Effects 0.000 claims abstract description 3
- 238000011217 control strategy Methods 0.000 claims description 8
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- H02J3/386—
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention proposes a kind of super capacitor energy-storage control method for promoting double-fed fan motor unit fault traversing and abnormal voltage tolerance：Setting DC bus-bar voltage control model initiation value (setting value 1) is slightly less than direct-current unloading circuit；The current voltage of Wind turbines direct current is detected, starts boost control models, super capacitor energy storage device control DC bus-bar voltage during more than setting value 1, super capacitor is only thrown in transient state moment；Start control buck patterns during not less than setting value 1, super capacitor energy-storage system maintains super capacitor its voltage to stablize (750V).It can ensure machine, net side power-balance, dc bus will not overvoltage.
Description
Technical field
The invention belongs to technical field of wind power generation, are related to a kind of promotion double-fed fan motor unit fault traversing and abnormal voltage
The super capacitor energy-storage control method of tolerance.
Background technology
Double-fed fan motor unit gradually occupies wind-power market master in the past few years due to the advantage in its cost and efficiency
Stream becomes the variable units of current mainstream.But since its stator is directly connected to power grid, rotor is connected to its turn by current transformer
Son carries out excitation, it is caused easily to be influenced be subject to grid disturbance and failure.Grid disturbance mainly has voltage and frequency, and frequency is disturbed
Dynamic that variable units are influenced less, this control for being primarily due to double-fed unit employs vector decoupling control technology；But voltage
Disturbance is affected to double-fed unit, this is because double-fed unit current transformer is mounted on rotary part rotor, stator voltage is disturbed
Dynamic component will amplify by angular frequency conversion in rotor-side, and rotor is caused larger transient state occur, damage current transformer.Except this it
Outside, voltage disturbance can also have an impact double-fed unit stability, dc bus electricity caused by being on the one hand embodied in magnetic linkage vibration
Pressure vibration；On the other hand DC bus-bar voltage overvoltage caused by being embodied in unbalanced power.With regard to current mainstream double-fed generator protection
For device, in the big value disturbance of network voltage, generally use rotor crow bar (crowbar) bypasses current transformer, ensures unsteady flow
Device does not damage due to rotor overcurrent；When the small value of network voltage is fallen, rotor transient current in current transformer allowed band, but
Dc bus is present with instantaneous overvoltage, is currently to ensure that dc bus is stablized by direct-current unloading circuit (chopper), together
When, direct-current unloading circuit can also balance rotor power and net side current transformer output power, ensure current transformer normal work.
In the recent period, super capacitor be used to implement double-fed unit low voltage crossing research is more and more concerned and other energy storage
Equipment has the characteristics that at low cost, power density is big, the response time is fast, maintenance cost compared to it.But as a kind of additional
How additional device, super capacitor realize double-fed fan motor unit low voltage crossing, improve its failure tolerance, this is needs pair
Its various aspects is studied, this method mainly for super capacitor control strategy and with double-fed fan motor unit control strategy
Cooperation.
The content of the invention
Super capacitor be used to implement double-fed unit low voltage crossing research is more and more concerned and other energy storage device phases
Have the characteristics that at low cost, power density is big, the response time is fast, maintenance cost than it.But as a kind of additional adapter
How part, super capacitor realize double-fed fan motor unit low voltage crossing, improve its failure tolerance, this be need it is each to its
Aspect is studied, and this method is matched somebody with somebody mainly for the control strategy of super capacitor and with double-fed fan motor unit control strategy
It closes.
Propose a kind of super capacitor energy-storage control for promoting double-fed fan motor unit fault traversing and abnormal voltage tolerance
Method processed：Step is：
1) super capacitor energy storage device control strategy is mainly made of two parts：Boost is controlled and buck controls, wherein
Boost controls control for DC bus-bar voltage, and buck controls control for super-capacitor voltage, when detecting that dc bus is more than
When " setting value 1 ", boost patterns start, and otherwise buck patterns work；" 0 " buck patterns, super capacitor energy-storage system remain super
Grade capacitance its voltage stablizes (750V)；When DC bus-bar voltage is more than setting valve 1.05pu due to electric network fault, pattern is cut
It changes to " 1 ", boost patterns, the DC bus-bar voltage of super capacitor energy storage device control at this time, super capacitor is only thrown in transient state moment
Enter, the duration is about more than ten of ms, for inhibiting busbar voltage transient process, only absorbs transient energy；Set dc bus
Voltage mode control initiation value, setting value 1 are allowed to be slightly less than direct-current unloading circuit 2) detection Wind turbines direct current it is electric at present
Pressure, 3) be more than setting value 1 when start boost control models, super capacitor energy storage device control DC bus-bar voltage, super capacitor
Start control buck patterns when only being put into transient state moment 4) not less than setting value 1, super capacitor energy-storage system maintains super electricity
Hold its voltage and stablize 750V, wherein, gain coefficient is only " 0 ", and whether " 1 " describes super capacitor energy storage device to direct current
Busbar carries out voltage control, and when super-capacitor voltage is prescribed a time limit beyond voltage up/down, otherwise gain coefficient reset is " 1 ", gain
Coefficient is mainly used for stabilizing second grade unit output fluctuation, will describe in detail stabilizing wind power swing part.
Description of the drawings
Fig. 1 composite voltage drilling-curves
Fig. 2 double-fed fan motor unit super capacitor energy storage device control strategies
Fig. 3 DC bus-bar voltages, super-capacitor voltage, mode switching signal
Fig. 4 DC bus-bar voltages, super-capacitor voltage, pattern switching
Fig. 5 DC bus-bar voltages compare (no super capacitor)
Fig. 6 DC bus-bar voltages compare (having super capacitor)
The grid-connected power of Fig. 7 (no super capacitor)
The grid-connected power of Fig. 8 (having super capacitor)
Fig. 9 super capacitor energy-storage system principle diagrams
Specific embodiment
This method relies on the control of super capacitor itself, realizes the promotion of fault ride-through capacity and voltage tolerance.Cause
This, for double-fed fan motor unit, super capacitor control targe is：
Target 1：Under grid voltage transient disturbance, it can ensure dc bus transient stability；
Target 2：During network voltage exception, ensure that unit runs without interruption, meet the voltage-tolerance curve (figure of proposition
1)。
Wherein, target 1 requires super capacitor energy-storage system to have faster regulations speed, and it is relatively strong that target 2 requires it to have
Harmony, that is, the premise for meeting voltage-tolerance curve be ensure super capacitor energy-storage system steady operation, super-capacitor voltage
It should be in working range.
As shown in Figure 2, super capacitor energy storage device control strategy is mainly made of two parts：Boost is controlled and buck controls
System, wherein boost control for DC bus-bar voltage control, buck control for super-capacitor voltage control, when detect direct current mother
When line is more than " setting value 1 ", boost patterns start, and otherwise buck patterns work.
" 0 " buck patterns, super capacitor energy-storage system maintain super capacitor its voltage to stablize (750V)；Work as dc bus
Voltage due to electric network fault be more than setting valve 1.05pu when, pattern switching to " 1 ", boost patterns, at this time super capacitor energy-storage dress
Control DC bus-bar voltage is put, super capacitor is only put into transient state moment, and the duration is about more than ten of ms, for inhibiting busbar
Voltage transient process only absorbs transient energy.
In order to realize that super capacitor energy storage device decouples the control of busbar voltage with direct-current unloading circuit, " can will set
The smaller and direct-current unloading circuit that definite value 1 " is adjusted avoids the two from working at the same time, causes busbar voltage unstable；In addition,
It also needs to consider the super capacitor operating voltage range under boost patterns, dynamic regulation gain coefficient can adjust super capacitor
Injection/absorbed power size prevents that here, gain coefficient is only " 0 " to super-capacitor voltage, and " 1 " is retouched beyond working range
State whether super capacitor energy storage device carries out voltage control to dc bus, when super-capacitor voltage is prescribed a time limit beyond voltage up/down,
Otherwise gain coefficient reset is " 1 ", gain coefficient is mainly used for stabilizing second grade unit output fluctuation, will stabilize wind power waves
Dynamic part describes in detail.
Voltage Drop to 0.75pu, 3MW double-feds unit is able to maintain that power-balance, wind since rotor Converter Capacity is larger
Wheel, generator speed remain unchanged substantially, and there are certain vibrations.Super capacitor is only put into transient state moment as seen from the figure, is continued
Time is about 10ms, for inhibiting busbar voltage transient process, only absorbs transient energy, so voltage rises unobvious, is generated
The main reason for phenomenon is net side current transformer and pusher side current transformer has identical power delivering capability, can be with so during stable state
Guarantee machine, net side power-balance, dc bus will not overvoltages.
When grid voltage sags are to 0.5pu, grid-connected power reduces, this is because lacking net side current transformer this Partial Power
Caused by the power of injection, this portion of energy is absorbed completely by super capacitor storage system, and for generator, active is balance
's.It can be obtained by Fig. 4, the super capacitor F of configuration can meet low-voltage tolerance index, and tolerance time surpasses at this time up to 3s
Grade capacitance voltage (750V~960V) in allowable fluctuation range, during fault transient moment and failure problems, dc bus
Voltage is well controlled, and net side current transformer can be used for supporting network voltage at this time.
When network voltage jumps to 1.15pu, it is not added with super capacitor control dc bus and larger vibration occurs, net side becomes
It flows device operation characteristic to deteriorate, this is because net side current transformer voltage, close to caused by output limit, which gradually dissipates, and works as increase
During to direct current off-load protection seting value, direct current off-load will be put into, if the high voltage duration is longer, when discharging circuit cannot be long
Between put into, then rotor crow bar will put into, unit enters fault traversing at this time, and low-voltage tolerance is weak, at the same time, output
Also there is larger vibration in power；After increasing super capacitor, dc bus vibration is effectively suppressed during network voltage raises,
Output power vibration reduces, but when network voltage is fallen, small vacancy occurs in dc bus, this is because net side current transformer with
Super capacitor energy-storage system does not have caused by cooperation control；From fig. 9, it can be seen that super capacitor ascensional range very little, mainly
For absorbing hunting power in short-term, so after installing super capacitor additional, unit high voltage tolerance can increase substantially, and energy
Ensure the good runnability of net side current transformer.
During voltage is increased to 1.2pu, it is not added with that super capacitor is active and reactive to be vibrated, it is active bigger than normal compared with steady-state value, this
It is since current transformer output voltage reaches the modulation limit, loses the complete control to electric current；Increase super capacitor and assisted with net side
After regulation and control system, output power vibration reduces, it can be seen that during high voltage, due to net side current transformer underexcited operation, inhales unit
Receipts are certain idle, play the role of supporting network voltage, and in addition, dc bus dynamic is relatively not added with having during super capacitor larger
Improving, vibration is inhibited, so, coordinate to control by super capacitor energy storage device and net side current transformer, can reach more preferable
High voltage tolerance effects.
Claims (1)
1. a kind of super capacitor energy-storage control method for promoting double-fed fan motor unit fault traversing and abnormal voltage tolerance,
It is characterized in that, step is：
1) super capacitor energy storage device control strategy is mainly made of two parts：Boost is controlled and buck controls, wherein boost
Control for DC bus-bar voltage control, buck control for super-capacitor voltage control, when detect dc bus be more than " setting value
When 1 ", boost patterns start, and otherwise buck patterns work；" 0 " buck patterns, super capacitor energy-storage system maintain super capacitor
Its voltage stablizes (750V)；When DC bus-bar voltage is more than setting valve 1.05pu due to electric network fault, pattern switching arrives
" 1 ", boost patterns, the DC bus-bar voltage of super capacitor energy storage device control at this time, super capacitor are only put into transient state moment,
Duration is about more than ten of ms, for inhibiting busbar voltage transient process, only absorbs transient energy；Set DC bus-bar voltage
Control model initiation value, setting value 1 are allowed to be slightly less than direct-current unloading circuit
2) the current voltage of Wind turbines direct current is detected
3) boost control models, super capacitor energy storage device control DC bus-bar voltage, super electricity are started when more than setting value 1
Hold and only put into transient state moment
4) control buck patterns are started when not less than setting value 1, super capacitor energy-storage system maintains super capacitor its voltage steady
Determine 750V, wherein, gain coefficient is only " 0 ", " 1 ", that is, describes whether super capacitor energy storage device carries out voltage to dc bus
Control, when super-capacitor voltage is prescribed a time limit beyond voltage up/down, otherwise gain coefficient reset is " 1 ", gain coefficient is mainly used for
Second grade unit output fluctuation is stabilized, will be described in detail stabilizing wind power swing part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711296741.9A CN108063454A (en) | 2017-12-08 | 2017-12-08 | A kind of super capacitor energy-storage control method for promoting double-fed fan motor function power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711296741.9A CN108063454A (en) | 2017-12-08 | 2017-12-08 | A kind of super capacitor energy-storage control method for promoting double-fed fan motor function power |
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| CN108063454A true CN108063454A (en) | 2018-05-22 |
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| CN201711296741.9A Withdrawn CN108063454A (en) | 2017-12-08 | 2017-12-08 | A kind of super capacitor energy-storage control method for promoting double-fed fan motor function power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381438A (en) * | 2020-03-10 | 2021-09-10 | 北京金风科创风电设备有限公司 | Power reduction control method and device for wind turbine generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078339A (en) * | 2013-01-29 | 2013-05-01 | 武汉大学 | Low-voltage ride through control system and method for capacity-optimal energy-storage type double-fed motor |
| CN103414205A (en) * | 2013-07-12 | 2013-11-27 | 国家电网公司 | Wind farm super capacitor energy storage type unified power quality conditioner |
| CN204905882U (en) * | 2015-07-07 | 2015-12-23 | 国网山东省电力公司电力科学研究院 | Double -fed aerogenerator exciting arrangement based on mix energy storage |
| CN105634013A (en) * | 2016-03-01 | 2016-06-01 | 国网甘肃省电力公司 | Control method for improving abnormal voltage withstand capability of wind turbine generator set by super capacitor |
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2017
- 2017-12-08 CN CN201711296741.9A patent/CN108063454A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078339A (en) * | 2013-01-29 | 2013-05-01 | 武汉大学 | Low-voltage ride through control system and method for capacity-optimal energy-storage type double-fed motor |
| CN103414205A (en) * | 2013-07-12 | 2013-11-27 | 国家电网公司 | Wind farm super capacitor energy storage type unified power quality conditioner |
| CN204905882U (en) * | 2015-07-07 | 2015-12-23 | 国网山东省电力公司电力科学研究院 | Double -fed aerogenerator exciting arrangement based on mix energy storage |
| CN105634013A (en) * | 2016-03-01 | 2016-06-01 | 国网甘肃省电力公司 | Control method for improving abnormal voltage withstand capability of wind turbine generator set by super capacitor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381438A (en) * | 2020-03-10 | 2021-09-10 | 北京金风科创风电设备有限公司 | Power reduction control method and device for wind turbine generator |
| CN113381438B (en) * | 2020-03-10 | 2024-01-23 | 北京金风科创风电设备有限公司 | Power reduction control method and device for wind turbine generator |
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Application publication date: 20180522 |