CN207166155U - Double-fed wind generating low voltage ride through system based on nine switch converters - Google Patents
Double-fed wind generating low voltage ride through system based on nine switch converters Download PDFInfo
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- CN207166155U CN207166155U CN201720847365.7U CN201720847365U CN207166155U CN 207166155 U CN207166155 U CN 207166155U CN 201720847365 U CN201720847365 U CN 201720847365U CN 207166155 U CN207166155 U CN 207166155U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model discloses a kind of double-fed wind generating low voltage ride through system based on nine switch converters, the system includes：Double-fed generator, rotor reactor, nine switch converters, network reactor, air-break and power network；Described rotor reactor one end is connected with doubly-fed generation machine rotor, and the other end is connected with nine switch converters；Described nine switch converters one end connects rotor reactor, and the other end is connected with the network reactor；The network reactor other end is connected with power network；Described air-break one end is connected to double-fed generator stator side, and the other end is connected with power network.Dual feedback wind power generation system one side of the present utility model is at nominal conditions, appropriate control strategy is coordinated to realize the cutting-in control good to double-fed generator by nine switch converters, on the other hand when grid entry point occurs that voltage is larger to be fallen, by nine switch converters and rational control strategy, the low voltage crossing of double feedback electric engine can be realized.
Description
Technical field
The utility model belongs to technical field of wind power generation, and in particular to a kind of double-fed wind-force based on nine switch converters
Generating low voltage ride through system.
Background technology
At present, double feed wind power generator group occupies larger share in wind-power electricity generation in the market, improves double-fed wind generating
The low voltage ride-through capability of machine is one of key technology of dual feedback wind power generation system.Typical dual feedback wind power generation system is usual
Using back-to-back double pwm converters, the stator of double-fed generator is directly connected with power network, and rotor is converted by back-to-back double PWM
Device is connected to power network.When grid voltage sags, overcurrent can be produced in rotor-side, can be produced on double pwm converter dc bus
Raw larger overvoltage, but in this system architecture by the power of rotor-side it is only the slip power of generator.Therefore,
Limited by converter capacity, rotor side converter can not control out larger rotor current and be imitated with reaching good compensation
Fruit, the low voltage ride-through capability of dual feedback wind power generation system are limited by larger.
Utility model content
The purpose of this utility model be in order to solve the problems, such as the low voltage ride-through capability deficiency of existing wind generator system,
It is proposed the double-fed wind generating low voltage ride through system based on nine switch converters.
The technical solution adopted in the utility model is：
Double-fed wind generating low voltage ride through system based on nine switch converters, it includes double-fed generator, rotor-side
Reactor, nine switch converters, network reactor, air-break and power network.Described rotor reactor one end and double-fed
Generator amature is connected, and the other end is connected with nine switch converters；Described nine switch converters one end connects rotor reactor,
The other end is connected with the network reactor；The network reactor other end is connected with power network；Described air-break one end
Double-fed generator stator side is connected to, the other end is connected with power network.
Further, described rotor reactor includes inductance L1, L2 and L3；Described network reactor includes inductance
L4, L5 and L6.
Further, nine described switch converters include dc bus, the first bridge arm, the second bridge arm and the 3rd bridge arm.
The dc bus is made up of electric capacity C1, C2 and resistance R1, R2.First bridge arm is by switching tube S11, switching tube S12, switch
Pipe S13, diode D11, diode D12, diode D13, inductance L11, inductance L12 compositions；Second bridge arm is by switching tube
S21, switching tube S22, switching tube S23, diode D21, diode D22, diode D23, inductance L21, inductance L22 compositions；Institute
The 3rd bridge arm is stated by switching tube S31, switching tube S32, switching tube S33, diode D31, diode D32, diode D33, inductance
L31, inductance L32 are formed；Further, the dual feedback wind power generation system based on nine switch converters, it is characterised in that：
The first electric capacity C1 and the second electric capacity C2 series connection of the dc bus of nine described switch converters, first resistor R1 and the first electric capacity
C1 is in parallel, and second resistance R2 and the second electric capacity C2 are in parallel；First electric capacity C1 positive pole and the first switch pipe S11's of the first bridge arm
Colelctor electrode, the first bridge arm the first diode D11 negative electrode connection；The first switch pipe S11 of first bridge arm emitter stage and
One end connection of first diode D11 of one bridge arm anode, the first inductance L11 of the first bridge arm；First electricity of the first bridge arm
Feel the L11 other end and the second switch pipe S12 colelctor electrode of the first bridge arm, the first bridge arm the second diode D12 negative electrode
Connection；Anode, the first bridge arm of the second switch pipe S12 of first bridge arm emitter stage and the second diode D12 of the first bridge arm
The second inductance L12 one end connection；The the second inductance L12 other end and the 3rd switching tube of the first bridge arm of first bridge arm
S13 colelctor electrode, the first bridge arm the 3rd diode D13 negative electrode connection；3rd switching tube S13 of the first bridge arm emitter stage
The negative pole connection of 3rd diode D13 of the first bridge arm anode, the second electric capacity C2；The structure of second bridge arm, the 3rd bridge arm
Structure and the structure of the first bridge arm are completely the same.
Further, the rotor of the inductance L1 of rotor reactor one end and double feedback electric engine connect, the other end with
The switching tube S12 of first bridge arm is connected with inductance L12 connection end；The inductance L2 of rotor reactor one end and double feedback electric engine
Rotor connection, the other end is connected with the switching tube S22 and inductance L22 of the second bridge arm connection end；The electricity of rotor reactor
Feel L3 one end and the rotor of double feedback electric engine connects, the connection end phase of the other end and the switching tube S32 and inductance L32 of the 3rd bridge arm
Even.
Further, the inductance L4 of network reactor one end and the inductance L11 and switching tube S12 with the first bridge arm
Connection end connection, the other end is connected with power network；The inductance L5 of network reactor one end with the inductance L21 of the second bridge arm and
Switching tube S22 connection end connection, the other end are connected with power network；The inductance L6 of network reactor one end with the 3rd bridge arm
Inductance L31 is connected with switching tube S32 connection end, and the other end is connected with power network.
Above-mentioned nine switch converters need to realize the independent control of net side and rotor-side output using SPWM modulation systems, i.e.,
In a switch periods, the first switch pipe S11 of the bridge arm of Schilling first, first switch pipe S21, the 3rd bridge arm of the second bridge arm
First switch pipe S31 turn on entirely, then bridge arm other switching tubes form a pwm converter, now net side branch road be complete zero
State, pusher side branch road are controllable；The 3rd switching tube S13, the 3rd switching tube S23, the 3rd bridge of the second bridge arm of the first bridge arm are made again
3rd switching tube S33 of arm is turned on entirely, and other switching tubes of bridge arm form another pwm converter, and now pusher side branch road is complete
Nought state, the output of net side branch road are controllable.
The beneficial effects of the utility model are：Nine switch converters reduce three compared to back-to-back double pwm converters
Individual switching device, so as to reduce the volume of current transformer, improve the power density of current transformer.In normal conditions, by right
The reasonable control of nine switch converters, nine switching devices of converter can be made full use of again, do not cause the waste of capacity.This
Outside, the DC bus-bar voltage of nine switch converters is higher than back-to-back converter DC voltage, and each switching tube is pressure-resistant
Resistance to current capacity also makes it be easier to realize than high in back-to-back converter, higher DC voltage and larger device capacitance
Low voltage crossing, by carrying out reasonable distribution to the high DC bus-bar voltage of nine switch converters and coordinating to control, it can improve
The ability of dual feedback wind power generation system low voltage crossing.
Brief description of the drawings
Fig. 1 is structure principle chart of the present utility model；
Fig. 2 is the phase-shifting carrier wave control structure figure of nine switch converters.
Embodiment
For content and feature of the present utility model is expanded on further, below in conjunction with accompanying drawing to specific implementation of the present utility model
Scheme is specifically described.
With reference to figure 1, the double-fed wind generating low voltage ride through system of the present utility model based on nine switch converters includes
Double-fed generator, rotor reactor, nine switch converters, network reactor, air-break and power network.The rotor-side
Reactor one end is connected with doubly-fed generation machine rotor, and the other end is connected with nine switch converters；Described nine switch converters one end
Rotor reactor is connected, the other end is connected with the network reactor；The network reactor other end is connected with power network；Institute
State air-break one end and be connected to double-fed generator stator side, the other end is connected with power network.
Described rotor reactor includes inductance L1, L2 and L3；Described network reactor include inductance L4, L5 and
L6。
Nine described switch converters include dc bus, the first bridge arm, the second bridge arm and the 3rd bridge arm；Dc bus by
Electric capacity C1, C2 and resistance R1, R2 composition.First bridge arm is by switching tube S11, switching tube S12, switching tube S13, diode D11, two
Pole pipe D12, diode D13, inductance L11, inductance L12 compositions；Second bridge arm is by switching tube S21, switching tube S22, switching tube
S23, diode D21, diode D22, diode D23, inductance L21, inductance L22 compositions；3rd bridge arm by switching tube S31, open
Close pipe S32, switching tube S33, diode D31, diode D32, diode D33, inductance L31, inductance L32 compositions；
The dc bus of nine described switch converters the first electric capacity C1 and the second electric capacity C2 series connection, first resistor R1 and
First electric capacity C1 is in parallel, and second resistance R2 and the second electric capacity C2 are in parallel；First electric capacity C1 positive pole is opened with the first of the first bridge arm
The negative electrode connection of pass pipe S11 colelctor electrode, the first diode D11 of the first bridge arm；The first switch pipe S11 of first bridge arm hair
Emitter-base bandgap grading and the first diode D11 of the first bridge arm anode, the first inductance L11 of the first bridge arm one end are connected；First bridge arm
The first inductance L11 the other end and the first bridge arm second switch pipe S12 colelctor electrode, the second diode of the first bridge arm
D12 negative electrode connection；The second switch pipe S12 of first bridge arm emitter stage and the second diode D12 of the first bridge arm anode,
Second inductance L12 of the first bridge arm one end connection；Second inductance L12 of the first bridge arm other end and the 3rd of the first bridge arm the
Switching tube S13 colelctor electrode, the first bridge arm the 3rd diode D13 negative electrode connection；3rd switching tube S13's of the first bridge arm
The negative pole connection of 3rd diode D13 of the bridge arm of emitter stage first anode, the second electric capacity C2；The structure of second bridge arm, the 3rd
The structure of bridge arm and the structure of the first bridge arm are completely the same.
The inductance L1 of rotor reactor one end and the rotor connection of double feedback electric engine, the other end and the first bridge arm
Switching tube S12 is connected with inductance L12 connection end；The inductance L2 of rotor reactor one end and the rotor of double feedback electric engine connect
Connect, the other end is connected with the switching tube S22 and inductance L22 of the second bridge arm connection end；The one of the inductance L3 of rotor reactor
End is connected with the rotor of double feedback electric engine, and the other end is connected with the switching tube S32 and inductance L32 of the 3rd bridge arm connection end；
The inductance L4 of network reactor one end and the connection end with the inductance L11 and switching tube S12 of the first bridge arm
Connection, the other end are connected with power network；The inductance L5 of network reactor one end and the inductance L21 and switching tube with the second bridge arm
S22 connection end connection, the other end are connected with power network；The inductance L6 of network reactor one end and the inductance with the 3rd bridge arm
L31 is connected with switching tube S32 connection end, and the other end is connected with power network；
Dual feedback wind power generation system shown in Fig. 1 is realized to each work(of nine switch converters using distinctive SPWM modulation systems
The control of rate switching tube, as shown in Figure 2.
The first switch pipe S11 of first bridge arm, the 3rd switching tube S13 of the first bridge arm, the first switch pipe of the second bridge arm
S21, the 3rd switching tube S23 of the second bridge arm, first switch pipe S31, the 3rd switching tube S33 of the 3rd bridge arm of the 3rd bridge arm are adopted
With identical triangular carrier Uc；
The first switch pipe S11 of first bridge arm uses primary sinusoid RU1It is superimposed the of direct current biasing mr as the first bridge arm
One modulating wave U11, the 3rd switching tube S13 of the first bridge arm use the second sine wave RU2Direct current biasing mi is subtracted as the first bridge arm
The second modulating wave U12；The the first modulating wave U11 and carrier wave Uc of first bridge arm obtain the first bridge arm by first comparator 101
First switch pipe S11 gate pole control level S1H；The the second modulating wave U12 and carrier wave Uc of first bridge arm pass through the second comparator
102 obtain the 3rd switching tube S13 of the first bridge arm gate pole control level S1L；The first switch pipe S11 of first bridge arm control
Level S1HWith the 3rd switching tube S13 of the first bridge arm control level S1LThe of first bridge arm is obtained by the first XOR gate 107
Two switching tube S12 gate pole control level S1M；
The first switch pipe S21 of second bridge arm uses the 3rd sine wave RV1It is superimposed the of direct current biasing mr as the second bridge arm
One modulating wave U21, the 3rd switching tube S23 of the second bridge arm use the 4th sine wave RV2Direct current biasing mi is subtracted as the second bridge arm
The second modulating wave U22；The the first modulating wave U21 and carrier wave Uc of second bridge arm obtain the first bridge arm by the 3rd comparator 103
First switch pipe S21 gate pole control level S2H；The the second modulating wave U22 and carrier wave Uc of first bridge arm pass through the 4th comparator
104 obtain the 3rd switching tube S23 of the second bridge arm gate pole control level S2L；The first switch pipe S21 of second bridge arm control
Level S2HWith the 3rd switching tube S23 of the second bridge arm control level S2LThe of second bridge arm is obtained by the second XOR gate 108
Two switching tube S22 gate pole control level S2M；
The first switch pipe S31 of 3rd bridge arm uses the 5th sine wave RW1It is superimposed the of direct current biasing mr as the 3rd bridge arm
One modulating wave U31, the 3rd switching tube S33 of the 3rd bridge arm use the 6th sine wave RW2Direct current biasing mi is subtracted as the 3rd bridge arm
The second modulating wave U32；The the first modulating wave U31 and carrier wave Uc of 3rd bridge arm obtain the 3rd bridge arm by the 5th comparator 105
First switch pipe S31 gate pole control level S3H；The the second modulating wave U32 and carrier wave Uc of 3rd bridge arm pass through the 6th comparator
106 obtain the 3rd switching tube S33 of the 3rd bridge arm gate pole control level S3L；The first switch pipe S31 of 3rd bridge arm control
Level S3HWith the 3rd switching tube S33 of the 3rd bridge arm control level S3LThe of 3rd bridge arm is obtained by the 3rd XOR gate 109
Two switching tube S32 gate pole control level S3M；Primary sinusoid RU1, the 3rd sine wave RV1, the 5th sine wave RW1Frequency it is identical
Phase differs 120o；Second sine wave RU24th sine wave RV26th sine wave RW2Frequency same phase difference 120o；
When grid entry point Voltage Drop degree is deeper, the utility model embodiment coordinates appropriate control strategy to pass through to nine
Switch converters reasonably control, and are easier to realize the not off-grid operation of double feedback electric engine than existing pwm converters double back-to-back,
Improve the low voltage ride-through capability of dual feedback wind power generation system.
Above-described embodiment is the preferable embodiment of the utility model, but embodiment of the present utility model is not by described
The limitation of embodiment, replacement that those of ordinary skill in the art are subject to according to technical solutions of the utility model, combination, simplification,
It should be included within the scope of protection of the utility model.
Claims (6)
1. the double-fed wind generating low voltage ride through system based on nine switch converters, it is characterised in that it by double-fed generator,
Rotor reactor, nine switch converters, network reactor, air-break and power network composition, the rotor reactor
One end is connected with doubly-fed generation machine rotor, and the other end is connected with nine switch converters, and nine switch converters one end connection turns
Sub- reactor, the other end are connected with the network reactor, and the network reactor other end is connected with power network, the air
Breaker one end is connected to double-fed generator stator side, and the other end is connected with power network.
2. the double-fed wind generating low voltage ride through system according to claim 1 based on nine switch converters, its feature
It is：Described rotor reactor includes inductance L1, L2 and L3；Described network reactor includes inductance L4, L5 and L6.
3. the double-fed wind generating low voltage ride through system according to claim 1 based on nine switch converters, its feature
It is：Nine described switch converters include dc bus, the first bridge arm, the second bridge arm and the 3rd bridge arm, the dc bus
It is made up of electric capacity C1, C2 and resistance R1, R2, first bridge arm is by switching tube S11, switching tube S12, switching tube S13, diode
D11, diode D12, diode D13, inductance L11, inductance L12 compositions, second bridge arm is by switching tube S21, switching tube
S22, switching tube S23, diode D21, diode D22, diode D23, inductance L21, inductance L22 compositions, the 3rd bridge arm
By switching tube S31, switching tube S32, switching tube S33, diode D31, diode D32, diode D33, inductance L31, inductance L32
Composition.
4. the double-fed wind generating low voltage ride through system according to claim 1 based on nine switch converters, its feature
It is：The first electric capacity C1 and the second electric capacity C2 series connection of the dc bus of nine described switch converters, first resistor R1 and the
One electric capacity C1 is in parallel, and second resistance R2 and the second electric capacity C2 are in parallel；First electric capacity C1 positive pole and the first switch of the first bridge arm
Pipe S11 colelctor electrode, the first bridge arm the first diode D11 negative electrode connection；The first switch pipe S11 of first bridge arm transmitting
Pole and the first diode D11 of the first bridge arm anode, the first inductance L11 of the first bridge arm one end are connected；First bridge arm
Second diode D12 of the first inductance L11 other end and the second switch pipe S12 of the first bridge arm colelctor electrode, the first bridge arm
Negative electrode connection；The second switch pipe S12 of first bridge arm emitter stage and the second diode D12 of the first bridge arm anode,
Second inductance L12 of one bridge arm one end connection；Second inductance L12 of the first bridge arm other end is opened with the 3rd of the first bridge arm
The negative electrode connection of pass pipe S13 colelctor electrode, the 3rd diode D13 of the first bridge arm；3rd switching tube S13 of the first bridge arm hair
The negative pole connection of 3rd diode D13 of the bridge arm of emitter-base bandgap grading first anode, the second electric capacity C2；The structure of second bridge arm, the 3rd bridge
The structure of arm and the structure of the first bridge arm are completely the same.
5. the double-fed wind generating low voltage ride through system according to claim 1 based on nine switch converters, its feature
It is：The inductance L1 of rotor reactor one end and the rotor of double feedback electric engine connect, the switching tube of the other end and the first bridge arm
S12 is connected with inductance L12 connection end；The inductance L2 of rotor reactor one end and the rotor of double feedback electric engine connect, another
End is connected with the switching tube S22 and inductance L22 of the second bridge arm connection end；The inductance L3 of rotor reactor one end and double-fed
The rotor connection of motor, the other end are connected with the switching tube S32 and inductance L32 of the 3rd bridge arm connection end.
6. the double-fed wind generating low voltage ride through system according to claim 1 based on nine switch converters, its feature
It is：The inductance L4 of network reactor one end is connected with the connection end of inductance L11 and switching tube S12 with the first bridge arm, separately
One end is connected with power network；The inductance L5 of network reactor one end and the connection with the inductance L21 and switching tube S22 of the second bridge arm
End connection, the other end are connected with power network；The inductance L6 of network reactor one end and the inductance L31 and switching tube with the 3rd bridge arm
S32 connection end connection, the other end are connected with power network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720847365.7U CN207166155U (en) | 2017-07-13 | 2017-07-13 | Double-fed wind generating low voltage ride through system based on nine switch converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720847365.7U CN207166155U (en) | 2017-07-13 | 2017-07-13 | Double-fed wind generating low voltage ride through system based on nine switch converters |
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| Publication Number | Publication Date |
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| CN207166155U true CN207166155U (en) | 2018-03-30 |
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ID=61712567
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720847365.7U Expired - Fee Related CN207166155U (en) | 2017-07-13 | 2017-07-13 | Double-fed wind generating low voltage ride through system based on nine switch converters |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574330A (en) * | 2018-05-18 | 2018-09-25 | 云南电网有限责任公司电力科学研究院 | A kind of power supply system based on shared electric power tower communication base station |
-
2017
- 2017-07-13 CN CN201720847365.7U patent/CN207166155U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574330A (en) * | 2018-05-18 | 2018-09-25 | 云南电网有限责任公司电力科学研究院 | A kind of power supply system based on shared electric power tower communication base station |
| CN108574330B (en) * | 2018-05-18 | 2021-04-13 | 云南电网有限责任公司电力科学研究院 | Power supply system based on shared power iron tower communication base station |
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