CN106602611A - Single quadrant converter weak magnetic flux weakening control-based wind power system and operation method therefor - Google Patents
Single quadrant converter weak magnetic flux weakening control-based wind power system and operation method therefor Download PDFInfo
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- CN106602611A CN106602611A CN201710091005.3A CN201710091005A CN106602611A CN 106602611 A CN106602611 A CN 106602611A CN 201710091005 A CN201710091005 A CN 201710091005A CN 106602611 A CN106602611 A CN 106602611A
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- 238000000034 method Methods 0.000 title claims description 18
- 230000004907 flux Effects 0.000 title abstract 3
- 230000003313 weakening effect Effects 0.000 title abstract 3
- 238000004804 winding Methods 0.000 claims abstract description 78
- 230000005284 excitation Effects 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims description 56
- 238000004146 energy storage Methods 0.000 claims description 24
- 230000001360 synchronised effect Effects 0.000 claims description 21
- 230000007423 decrease Effects 0.000 claims description 15
- 230000003247 decreasing effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 abstract description 15
- 230000008859 change Effects 0.000 abstract description 7
- 239000003990 capacitor Substances 0.000 abstract description 4
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- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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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
Abstract
An embodiment of the invention provides a single quadrant converter weak magnetic flux weakening control-based wind power system. The single quadrant converter weak magnetic flux weakening control-based wind power system provides unipolar armature voltage and armature currents to a rotor armature winding of a direct current motor via a single quadrant driving converter, unipolar excitation voltage and excitation currents are provided to a stator excitation winding of the direct current electric motor via an excitation converter, a direct current bus capacitor and a power frequency power grid are connected via a diode rectifier, the single quadrant driving converter and the excitation converter are used for replacing a bridge type reversible PWM converter, the diode rectifier is used for replacing a three phase PWM rectifier, the quantity and switch loss of power switch tubes are greatly reduced, and power fluctuation which is caused when a wind power generator rotating speed rapidly responds to wind speed change in order to improve wind energy utilization rates is compensated; technical problems of excess system cost and switch loss, damage risks caused by straight through short circuit faults and contradiction between wind energy utilization rates and power fluctuation caused by the three phase PWM rectifier and the bridge type reversible PWM converter can be solved.
Description
Technical field
The present invention relates to field of new energy generation, more particularly to a kind of wind-powered electricity generation system controlled based on single quadrant converter weak magnetic
System and its operation method.
Background technology
Variable frequency transformer is a kind of new electrical network interconnection equipment, and the equipment is all solve that wind-electricity integration faced
There is unique advantage in many problems.On the one hand, variable frequency transformer can be used in carrying out constant speed wind turbines electrical network close friend
Type transform so as to meet electrical network Wind turbines power output is smoothed, possesses low voltage ride-through capability, in the grid voltage sags phase
Between provide reactive power support requirement.On the other hand, the power electronics in traditional wind power system is replaced using variable frequency transformer
Current transformer, greatly reduces the capacity and cost of power electronic equipment, and its overload capacity is significantly enhanced.In view of its uniqueness is excellent
Gesture, variable frequency transformer will play an increasingly important role in wind-electricity integration field.
The variable frequency transformer of wind-power electricity generation is applied at present, it has to be possible to forward and reverse rotation, and allow for carrying
For forward and reverse torque, thus its direct current generator must adopt electric energy can transmitted in both directions converter drive.Generally, as shown in figure 1,
The converter is made up of Three-Phase PWM Rectifier and bridge-type Reversible PWM converter, and wherein Three-Phase PWM Rectifier needs six power
Switching tube and six fly-wheel diodes, bridge-type Reversible PWM converter needs four power switch pipes and four fly-wheel diodes.By
This produces two adverse effects, and one is that power device excessively causes too high system cost and switching loss, and two is same bridge arm
Two switching tubes up and down there is the risk damaged because of shoot through.
Additionally, the existing wind comprising Three-Phase PWM Rectifier and bridge-type Reversible PWM converter based on variable frequency transformer
Electric system, only using the rotation energy storage of Wind turbines, reduces output-power fluctuation, without in maximal wind-energy in fluctuations in wind speed
Reduced while wind energy conversion system rotating speed quickly follows wind speed to change using the rotation energy storage of variable frequency transformer in acquisition procedure
Power swing.This method of operation is disadvantageous in that：During wind energy conversion system rotating speed follows wind speed to rise rapidly, need in a large number
Electric energy is converted into the rotation function of wind energy conversion system, and wind energy conversion system power output can temporarily decline, and treats that wind energy conversion system runs on new stable state and turns
After speed, its power output can rise rapidly again；Conversely, during wind energy conversion system rotating speed follows wind speed to decline rapidly, needing will be substantial amounts of
Wind energy conversion system rotation function is converted into electric energy, and wind energy conversion system power output can temporarily rise, and treats that wind energy conversion system runs on new steady-state speed
Afterwards, its power output can decline rapidly again.Therefore, the dynamic responding speed of existing Wind turbines, it is necessary to improving Wind Power Utilization
Tradeoff design is carried out between rate and reduction power swing.
Therefore, Three-Phase PWM Rectifier and bridge-type Reversible PWM converter cause too high system cost and switching loss, deposit
In the risk damaged because of shoot through, between wind energy utilization and power swing, contradiction is that those skilled in the art need to solve
Technical problem.
The content of the invention
A kind of wind power system controlled based on single quadrant converter weak magnetic and its operation method are embodiments provided,
For solving Three-Phase PWM Rectifier and bridge-type Reversible PWM converter causes too high system cost and switching loss, exists because straight
Logical short circuit and damage risk, between wind energy utilization and power swing contradiction technical problem.
A kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention, including：Wind-force is sent out
Group of motors, variable frequency transformer, step-down transformer and common frequency power network, the variable frequency transformer includes double feedback electric engine, straight
Stream motor, single quadrant drive converter, pwm converter, dc-link capacitance, diode rectifier；
The rotor windings connection wind power generating set of the double feedback electric engine, the stator winding connection of the double feedback electric engine is described
Common frequency power network, the double feedback electric engine is coaxially mechanically connected with the direct current generator；
One end of single quadrant drive converter connects the armature rotor winding of the direct current generator, and single quadrant drives
The other end of dynamic converter connects the dc-link capacitance；
One end of the pwm converter connects the stator excitation winding of the direct current generator, the pwm converter it is another
One end connects the dc-link capacitance；
The ac input end of the diode rectifier connects the common frequency power network by the step-down transformer, and described two
The DC output end of pole pipe rectifier connects the dc-link capacitance；
Wherein, single quadrant drive converter is used to provide unipolar armature voltage and armature supply to the direct current
The armature rotor winding of motor, the pwm converter is used to provide unipolar excitation voltage and exciting current to the direct current
The stator excitation winding of motor.
Preferably, single quadrant drive converter includes the first power switch pipe and the first fly-wheel diode；
The emitter stage of first power switch pipe connects the negative electrode of first fly-wheel diode；
The anode of the colelctor electrode of first power switch pipe and first fly-wheel diode connects respectively the direct current
The positive pole and negative pole of bus capacitor；
The negative electrode and anode of first fly-wheel diode is connecting respectively the armature rotor winding of the direct current generator just
Pole and negative pole.
Preferably, the pwm converter includes the second power switch pipe and the second fly-wheel diode；
The emitter stage of second power switch pipe connects the negative electrode of second fly-wheel diode；
The anode of the colelctor electrode of second power switch pipe and second fly-wheel diode connects respectively the direct current
The positive pole and negative pole of bus capacitor；
The negative electrode and anode of second fly-wheel diode is connecting respectively the stator excitation winding of the direct current generator just
Pole and negative pole.
Preferably, the diode rectifier includes six commutation diodes；
Six commutation diodes are in parallel with the dc-link capacitance after series aiding connection two-by-two；
Three phase connections of the step-down transformer connect respectively the junction of the commutation diode of series connection.
Preferably, the wind power generating set includes wind energy conversion system, gear-box, synchronous generator；
The wind energy conversion system is mechanically connected by the gear-box with the synchronous generator；
The stator winding of the synchronous generator connects the rotor windings of the double feedback electric engine.
Preferably, single quadrant drive converter adopts double-closed-loop control algorithm；
Rotary speed setting value and corresponding survey of the proportional and integral controller of rotating speed outer shroud according to the variable frequency transformer
The difference of value obtains the armature rotor winding current set-point of the direct current generator, the armature rotor winding current set-point
The upper limit be set as the rated current of single quadrant drive converter, the lower limit of the armature rotor winding current set-point sets
It is set to zero；
The proportional and integral controller of current inner loop according to the armature rotor winding current set-point of the direct current generator with it is right
The difference of the measured value answered obtains the dutycycle of single quadrant drive converter.
Preferably, measuring wind speed in real time and most of the rotary speed setting value of the variable frequency transformer with specific reference to wind energy conversion system
Wind-energy capture control algolithm is calculated.
Preferably, the pwm converter is controlled by exciting current closed loop control algorithm；
Stator excitation winding given value of current value of the pwm converter proportional and integral controller according to the direct current generator
With the dutycycle that the deviation of corresponding measured value calculates the pwm converter；
The Exciting Windings for Transverse Differential Protection given value of current value is calculated with specific reference to the real-time measurement rotating speed of wind power generating set.
Preferably, the wind power generating set of the rotor windings connection of the double feedback electric engine is a group or more of.
A kind of wind power system operation method controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention, is based on
A kind of above-mentioned wind power system controlled based on single quadrant converter weak magnetic is run, including：
When wind speed rises, single quadrant drive converter of variable frequency transformer and pwm converter control direct current generator
Rotating speed declines, and the rotating speed for making wind power generating set rises, while discharging the rotation energy storage of double feedback electric engine and direct current generator to compensate
The rotation energy storage of wind power generating set；
When wind power generating set runs on rated speed, single quadrant drive converter of variable frequency transformer and excitation
Convertor controls DC motor speed is zero；
When wind speed decreased, single quadrant drive converter of variable frequency transformer and pwm converter control direct current generator
Rotating speed rises, and the rotating speed for making wind power generating set declines, at the same absorb the rotation energy storage of wind power generating set to double feedback electric engine with
The rotation energy storage of direct current generator；During the rotating speed of wind power generating set is with wind speed decreased, if the rotor of direct current generator
Control voltage needed for armature winding exceedes the first power switch pipe and the first fly-wheel diode in single quadrant drive converter
Safe voltage, then reduce the Exciting Windings for Transverse Differential Protection given value of current value of pwm converter, realizes wind power generating set in low wind speed section most
Wind-energy capture.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
A kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention is driven by single quadrant
Dynamic converter provides the armature rotor winding of unipolar armature voltage and armature supply to direct current generator, by pwm converter
The stator excitation winding of unipolar excitation voltage and exciting current to direct current generator is provided, it is straight by diode rectifier connection
Between stream bus capacitor and common frequency power network, so as to substituted for bridge-type Reversible PWM with single quadrant drive converter and pwm converter
Converter, with diode rectifier Three-Phase PWM Rectifier is substituted for, so as to simplify the circuit of variable frequency transformer so that
The quantity and switching loss of power switch pipe is greatly decreased, with more preferable economy；Bridge arm direct pass short circuit can completely be avoided
Caused power switch pipe is damaged, with more preferable reliability；Meanwhile, it is provided in an embodiment of the present invention a kind of based on single quadrant change
When the wind power system of parallel operation weak magnetic control runs, wind power generating set rotating speed rises the rotation that (decline) absorbs (release)
Kinetic energy, can decline the rotation function realization part compensation that (rising) discharges (absorption) by variable frequency transformer rotating speed, because
This can reduce the output-power fluctuation during maximal wind-energy capture.
Therefore, the embodiment of the present invention solves Three-Phase PWM Rectifier and bridge-type Reversible PWM converter causes too high system
Cost and switching loss, exist damage because of shoot through risk, between wind energy utilization and power swing contradiction technology
Problem.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is that the embodiment of the present invention is used to illustrate the principle of the existing variable-speed wind-power system based on variable frequency transformer
Figure；
Fig. 2 is an a kind of reality of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
Apply the schematic diagram of example；
Fig. 3 is another of a kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
The schematic diagram of embodiment；
Fig. 4 is a kind of wind power system operation method controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
One embodiment flow chart；
Wherein, reference is as follows：
1st, wind energy conversion system；2nd, gear-box；3rd, synchronous generator；4th, variable frequency transformer；5th, common frequency power network；6th, downconverter
Device；7th, double feedback electric engine；8th, direct current generator；9th, single quadrant drive converter；10th, pwm converter；11st, dc-link capacitance；12、
Diode rectifier.
Specific embodiment
A kind of wind power system controlled based on single quadrant converter weak magnetic and its operation method are embodiments provided,
For solving Three-Phase PWM Rectifier and bridge-type Reversible PWM converter causes too high system cost and switching loss, exists because straight
Logical short circuit and damage risk, between wind energy utilization and power swing contradiction technical problem.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described, it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Fig. 2 is referred to, a kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
One embodiment, including：Wind power generating set, variable frequency transformer 4, step-down transformer 6 and common frequency power network 5, variable frequency
Transformer 4 include double feedback electric engine 7, direct current generator 8, single quadrant drive converter 9, pwm converter 10, dc-link capacitance 11,
Diode rectifier 12；
The rotor windings connection wind power generating set of double feedback electric engine 7, the stator winding connection common frequency power network 5 of double feedback electric engine 7,
Double feedback electric engine 7 is coaxial with direct current generator 8 to be mechanically connected；
One end of single quadrant drive converter 9 connects the armature rotor winding of direct current generator 8, single quadrant drive converter 9
The other end connection dc-link capacitance 11；
One end of pwm converter 10 connects the stator excitation winding of direct current generator 8, and the other end of pwm converter 10 connects
Connect dc-link capacitance 11；
The ac input end of diode rectifier 12 connects common frequency power network 5, diode rectifier 12 by step-down transformer 6
DC output end connection dc-link capacitance 11；
Wherein, single quadrant drive converter 9 is used to provide unipolar armature voltage and armature supply to direct current generator 8
Armature rotor winding, pwm converter 10 is used to provide the stator of unipolar excitation voltage and exciting current to direct current generator 8
Exciting Windings for Transverse Differential Protection.
Wind power generating set includes wind energy conversion system 1, gear-box 2, synchronous generator 3；
Wind energy conversion system 1 is mechanically connected by gear-box 2 with synchronous generator 3；
The stator winding of synchronous generator 3 connects the rotor windings of double feedback electric engine 7.
A kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention is driven by single quadrant
Dynamic converter 9 provides the armature rotor winding of unipolar armature voltage and armature supply to direct current generator 8, is converted by excitation
Device 10 provides the stator excitation winding of unipolar excitation voltage and exciting current to direct current generator 8, by diode rectifier
Between 12 connection dc-link capacitances 11 and common frequency power network 5, so as to be replaced with single quadrant drive converter 9 and pwm converter 10
Bridge-type Reversible PWM converter, with diode rectifier 12 Three-Phase PWM Rectifier is substituted for, and is become so as to simplify variable frequency
The circuit of depressor 4 so that the quantity and switching loss of power switch pipe is greatly decreased, with more preferable economy；Can be complete
Power switch pipe caused by bridge arm direct pass short circuit is avoided to damage, with more preferable reliability；Meanwhile, it is provided in an embodiment of the present invention
When a kind of wind power system controlled based on single quadrant converter weak magnetic is run, wind power generating set rotating speed rises (decline) institute
The rotation function of (release) is absorbed, the rotation that can discharge (absorption) by the rotating speed of variable frequency transformer 4 decline (rising) is moved
Can realize that part compensates, therefore the output-power fluctuation during maximal wind-energy capture can be reduced.
Therefore, the embodiment of the present invention solves Three-Phase PWM Rectifier and bridge-type Reversible PWM converter causes too high system
Cost and switching loss, exist damage because of shoot through risk, between wind energy utilization and power swing contradiction technology
Problem.
It is more than to a kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
Individual embodiment is described in detail, below will be to provided in an embodiment of the present invention a kind of based on single quadrant converter weak magnetic control
Another embodiment of wind power system be described in detail.
Fig. 3 is referred to, a kind of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
Another embodiment, including：Wind power generating set, variable frequency transformer 4, step-down transformer 6 and common frequency power network 5, variable ratio frequency changer
Rate transformer 4 includes double feedback electric engine 7, direct current generator 8, single quadrant drive converter 9, pwm converter 10, dc-link capacitance
11st, diode rectifier 12；
The rotor windings connection wind power generating set of double feedback electric engine 7, the stator winding connection common frequency power network 5 of double feedback electric engine 7,
Double feedback electric engine 7 is coaxial with direct current generator 8 to be mechanically connected；
One end of single quadrant drive converter 9 connects the armature rotor winding of direct current generator 8, single quadrant drive converter 9
The other end connection dc-link capacitance 11；
One end of pwm converter 10 connects the stator excitation winding of direct current generator 8, and the other end of pwm converter 10 connects
Connect dc-link capacitance 11；
The ac input end of diode rectifier 12 connects common frequency power network 5, diode rectifier 12 by step-down transformer 6
DC output end connection dc-link capacitance 11；
Wherein, single quadrant drive converter 9 is used to provide unipolar armature voltage and armature supply to direct current generator 8
Armature rotor winding, pwm converter 10 is used to provide the stator of unipolar excitation voltage and exciting current to direct current generator 8
Exciting Windings for Transverse Differential Protection.
Single quadrant drive converter 9 includes the first power switch pipe and the first fly-wheel diode；
The emitter stage of the first power switch pipe connects the negative electrode of the first fly-wheel diode；
The anode of the colelctor electrode of the first power switch pipe and the first fly-wheel diode connects respectively dc-link capacitance 11
Positive pole and negative pole；
The negative electrode and anode of the first fly-wheel diode connects respectively the positive pole of the armature rotor winding of direct current generator 8 and bears
Pole.
Pwm converter 10 includes the second power switch pipe and the second fly-wheel diode；
The emitter stage of the second power switch pipe connects the negative electrode of the second fly-wheel diode；
The anode of the colelctor electrode of the second power switch pipe and the second fly-wheel diode connects respectively dc-link capacitance 11
Positive pole and negative pole；
The negative electrode of the second fly-wheel diode and anode connect the stator excitation winding of direct current generator 8.
Diode rectifier 12 includes six commutation diodes；
Six commutation diodes are in parallel with dc-link capacitance 11 after series aiding connection two-by-two；
Three phase connections of step-down transformer 6 connect respectively the junction of the commutation diode of series connection.
Wind power generating set includes wind energy conversion system 1, gear-box 2, synchronous generator 3；
Wind energy conversion system 1 is mechanically connected by gear-box 2 with synchronous generator 3；
The stator winding of synchronous generator 3 connects the rotor windings of double feedback electric engine 7.
Single quadrant drive converter 9 adopts double-closed-loop control algorithm；
Rotary speed setting value and corresponding measured value of the proportional and integral controller of rotating speed outer shroud according to variable frequency transformer 4
Difference obtain direct current generator 8 armature rotor winding current set-point, armature rotor winding current set-point the upper limit setting
For the rated current of single quadrant drive converter 9, the lower limit set of armature rotor winding current set-point is zero；
The proportional and integral controller of current inner loop according to the armature rotor winding current set-point of direct current generator 8 with it is corresponding
The difference of measured value obtains the dutycycle of single quadrant drive converter 9；
Exciting Windings for Transverse Differential Protection given value of current value is calculated with specific reference to the real-time measurement rotating speed of variable frequency transformer 4, when can
When Frequency transformer rotating speed is zero, Exciting Windings for Transverse Differential Protection given value of current value is equal to rated value, and Exciting Windings for Transverse Differential Protection given value of current value with can
The rising of the rotating speed of Frequency transformer 4 and decline.
The rotating speed of variable frequency transformer 4 generally refers to the rotating speed of its motor internal (double feedback electric engine 7 and direct current generator 8).
The rotary speed setting value of variable frequency transformer 4 is caught with specific reference to the measuring wind speed in real time and maximal wind-energy of wind energy conversion system 1
Obtain control algolithm to calculate.
Pwm converter 10 is controlled by exciting current closed loop control algorithm；
The proportional and integral controller of pwm converter 10 according to the stator excitation winding given value of current value of direct current generator 8 with it is corresponding
The deviation of measured value calculate the dutycycle of pwm converter 10；
Exciting Windings for Transverse Differential Protection given value of current value is calculated with specific reference to the real-time measurement rotating speed of wind power generating set.
The wind power generating set of the rotor windings connection of double feedback electric engine 7 is a group or more of.
The present invention be it is a kind of based on single quadrant converter weak magnetic control wind power system, including wind energy conversion system 1, gear-box 2, sense
Synchronous generator 3, variable frequency transformer 4, step-down transformer 6 and common frequency power network 5, wherein variable frequency transformer 4 is answered to include
Double feedback electric engine 7, direct current generator 8, single quadrant drive converter 9, pwm converter 10, dc-link capacitance 11, diode rectification
Device 12.Within the system, variable frequency transformer 4 only needs to realize that one direction rotates under one direction torque, therefore drives change
Parallel operation need to only adopt the single quadrant converter containing a power switch pipe and a fly-wheel diode composition.With existing variable ratio frequency changer
Rate transformer 4 is compared, and the power switch pipe quantity of driving transducer of the present invention and switching loss are substantially reduced, and
Power switch pipe can be completely avoided to damage because of bridge arm direct pass short circuit.When the rotating speed of variable frequency transformer 4 is higher, in excitation
Converter 10 is dropped using weak magnetic control while ensure that wind energy conversion system 1 realizes maximal wind-energy capture in the range of larger wind speed
The stress levels of power switch pipe and fly-wheel diode in low single quadrant drive converter 9.Wind energy conversion system 1, gear-box 2 and synchronous
The rotating speed quick response wind speed change of motor 3, the power swing for being caused can pass through the rotation energy storage of variable frequency transformer 4
Realize that part compensates.The present invention can significantly reduce the cost of driving transducer in variable frequency transformer, improve driving transducer
Reliability, reduce maximal wind-energy capture during output-power fluctuation.The present invention can control separate unit wind energy conversion system, it is also possible to
Control multiple stage wind energy conversion system.
Wind energy conversion system 1 runs on rated speed when the rotating speed of variable frequency transformer 4 is zero, and the rotating speed of variable frequency transformer 4 is just
The rotating speed of wind energy conversion system 1 is reduced when ramping up, and wind energy conversion system 1 runs on minimum when variable frequency transformer 4 runs on positive maximum speed
Rotating speed；The armature rotor winding of direct current generator 8 in variable frequency transformer 4, using by a power switch pipe and an afterflow
Single quadrant drive converter 9 of diode composition provides unipolar armature voltage and armature supply；In variable frequency transformer 4
The stator excitation winding of direct current generator 8, using the pwm converter being made up of a power switch pipe and a fly-wheel diode
10 provide unipolar excitation voltage and exciting current；Pwm converter 10 exports specified when wind energy conversion system 1 runs on rated speed
Exciting current, the exciting current of the output of pwm converter 10 declines therewith when the rotating speed of wind energy conversion system 1 declines.
The rotation energy storage that the rotating speed rapid increase of wind energy conversion system 1, gear-box 2 and synchronous generator 3 is absorbed, can be by variable ratio frequency changer
The rotating speed of rate transformer 4 declines discharged rotation energy storage and realizes that part compensates；3 turns of wind energy conversion system 1, gear-box 2 and synchronous generator
The rotation energy storage that fast rapid decrease is discharged can rise absorbed rotation energy storage and realize part by the rotating speed of variable frequency transformer 4
Compensation；In the change of the rotating speed quick response wind speed of wind energy conversion system 1, to realize during maximal wind-energy capture, the output work of wind power system is reduced
Rate fluctuates.
Structure is extremely simple used in the driver of the direct current generator 8 of the variable frequency transformer 4 of variable-speed wind-power system
Single quadrant drive converter 9, with reference to weak magnetic control, effectively reduce the pressure etc. of single breaker in middle device of quadrant drive converter 9
Level, while variable frequency 4 stable operation of transformer is guaranteed so that wind energy conversion system 1 can be realized most in the range of larger wind speed
Wind-energy capture, and reduce the output-power fluctuation given during maximal wind-energy capture.
The rotor windings of double feedback electric engine 7, can individually connect a typhoon power generator, it is also possible to while connect some typhoon conditions connecing
Near wind-driven generator.
It should be noted that the embodiment of the present invention has the advantage that and beneficial effect：
1st, in variable-speed wind-power system, the driver of the direct current generator 8 needed for variable frequency transformer 4, using by
Single quadrant drive converter 9 of power switch pipe and a fly-wheel diode composition, with main employing at present comprising four work(
The bridge-type Reversible PWM converter of rate switching tube and four fly-wheel diodes is compared with advantages below：The quantity of power switch pipe
It is greatly decreased with switching loss, with more preferable economy；Power switch pipe caused by bridge arm direct pass short circuit can completely be avoided
Damage, with more preferable reliability.
2nd, in variable-speed wind-power system, the rectifier between dc-link capacitance 11 and common frequency power network 5, using by six two
The rectifier of pole pipe composition, with the main PWM rectifications comprising six power switch pipes and six fly-wheel diodes for adopting at present
Device is compared with advantages below：The quantity and switching loss of power switch pipe is greatly decreased, with more preferable economy.
3rd, in variable-speed wind-power system, for maximal wind-energy capture is better achieved, the rotating speed of wind energy conversion system 1 must be followed quickly
Wind speed changes.A large amount of electric energy are converted into wind energy conversion system 1, the and of gear-box 2 by the rotating speed rapid increase of wind energy conversion system 1 when wind speed rises, needs
The rotation function of synchronous generator 3；The rotating speed rapid decrease of wind energy conversion system 1 during wind speed decreased, needs are converted into a large amount of rotation functions
Electric energy.Wind energy conversion system 1, gear-box 2 and the rotating speed of synchronous generator 3 rise the rotation function that (decline) absorbs (release), can pass through
The rotating speed of variable frequency transformer 4 declines (rising) and discharges the rotation function realization part compensation of (absorption), therefore can reduce most
Output-power fluctuation during wind-energy capture.
Therefore, the present invention contributes to promoting the practical application based on the variable-speed wind-power system of variable frequency transformer.
It is more than to a kind of the another of wind power system controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
One embodiment is described in detail, below will be to provided in an embodiment of the present invention a kind of based on single quadrant converter weak magnetic control
One embodiment of the wind power system operation method of system is described in detail.
Refer to Fig. 4, a kind of wind power system fortune controlled based on single quadrant converter weak magnetic provided in an embodiment of the present invention
One embodiment of row method, is run based on a kind of above-mentioned wind power system controlled based on single quadrant converter weak magnetic,
Including：
101：When wind speed rises, single quadrant drive converter of variable frequency transformer and pwm converter control direct current
Motor speed declines, and the rotating speed for making wind power generating set rises, at the same the rotation energy storage of release double feedback electric engine and direct current generator with
The rotation energy storage of compensation wind power generating set；
102：When wind power generating set runs on rated speed, single quadrant drive converter of variable frequency transformer and
It is zero that pwm converter controls DC motor speed；
103：When wind speed decreased, single quadrant drive converter of variable frequency transformer and pwm converter control direct current
Motor speed rises, and the rotating speed for making wind power generating set declines, while absorbing the rotation energy storage of wind power generating set to duplex feeding
The rotation energy storage of machine and direct current generator；During the rotating speed of wind power generating set is with wind speed decreased, if direct current generator
Control voltage needed for armature rotor winding exceedes the first power switch pipe and the pole of the first afterflow two in single quadrant drive converter
The safe voltage of pipe, then reduce the Exciting Windings for Transverse Differential Protection given value of current value of pwm converter, realizes wind power generating set in low wind speed section
Maximal wind-energy capture.
It should be noted that 101,102,103 is not to carry out by step, but carried out according to the situation of current wind speed
Corresponding running, when wind speed is in different phase, single quadrant drive converter of variable frequency transformer and excitation
Converter controls DC motor speed according to default operation program to be changed accordingly.
In the existing variable-speed wind-power system based on variable frequency transformer, only using the rotation energy storage of Wind turbines,
Output-power fluctuation is reduced during fluctuations in wind speed, without during maximal wind-energy capture, using the rotation of variable frequency transformer
Dump energy, quickly follows wind speed to reduce power swing while change in wind energy conversion system rotating speed.The disadvantage of this method of operation
It is：During wind energy conversion system rotating speed follows wind speed to rise rapidly, a large amount of electric energy need to be converted into the rotation function of wind energy conversion system, wind-force
Machine power output can temporarily decline, and after wind energy conversion system runs on new steady-state speed, its power output can rise rapidly again；Instead
It, during wind energy conversion system rotating speed follows wind speed to decline rapidly, need to be converted into electric energy, wind energy conversion system by substantial amounts of wind energy conversion system rotation function
Power output can temporarily rise, and after wind energy conversion system runs on new steady-state speed, its power output can decline rapidly again.Therefore,
The dynamic responding speed of existing Wind turbines, it is necessary to carry out compromise between raising wind energy utilization and reduction power swing and set
Meter.
In a kind of wind power system operation method based on the control of single quadrant converter weak magnetic provided in an embodiment of the present invention, can
Wind energy conversion system runs on rated speed, wind energy conversion system when variable frequency transformer rotating speed forward direction rises when Frequency transformer rotating speed is zero
Rotating speed is reduced, and variable frequency transformer station high-voltage side bus wind energy conversion system when positive maximum speed runs on minimum speed；Variable frequency transformation
The armature rotor winding of direct current generator in device, using the single quadrant drive being made up of a power switch pipe and a fly-wheel diode
Dynamic converter provides unipolar armature voltage and armature supply；In variable frequency transformer the stator excitation of direct current generator around
Group, using the pwm converter being made up of a power switch pipe and fly-wheel diode provide unipolar excitation voltage and
Exciting current；Pwm converter output rated exciting current when wind energy conversion system runs on rated speed, wind energy conversion system rotating speed is encouraged when declining
The exciting current of magnetic transformer output declines therewith.
The rotation energy storage that the rotating speed rapid increase of wind energy conversion system, gear-box and synchronous generator is absorbed, can be by variable frequency
Transformer rotating speed declines discharged rotation energy storage and realizes that part compensates；Wind energy conversion system, gear-box and synchronous generator rotating speed are quick
Declining discharged rotation energy storage can realize that part compensates by the absorbed rotation energy storage of variable frequency transformer rotating speed rising；
Wind energy conversion system rotating speed quick response wind speed changes, and to realize during maximal wind-energy capture, reduces the output-power fluctuation of wind power system.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
The above, above example only to illustrate technical scheme, rather than a limitation；Although with reference to front
State embodiment to be described in detail the present invention, it will be understood by those within the art that：It still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these
Modification is replaced, and does not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (10)
1. it is a kind of based on single quadrant converter weak magnetic control wind power system, including：Wind power generating set, variable frequency transformation
Device, step-down transformer and common frequency power network, it is characterised in that the variable frequency transformer includes double feedback electric engine, direct current generator, list
Quadrant drive converter, pwm converter, dc-link capacitance, diode rectifier；
The rotor windings connection wind power generating set of the double feedback electric engine, the stator winding of the double feedback electric engine connects the power frequency
Electrical network, the double feedback electric engine is coaxially mechanically connected with the direct current generator；
One end of single quadrant drive converter connects the armature rotor winding of the direct current generator, and single quadrant drive becomes
The other end of parallel operation connects the dc-link capacitance；
One end of the pwm converter connects the stator excitation winding of the direct current generator, the other end of the pwm converter
Connect the dc-link capacitance；
The ac input end of the diode rectifier connects the common frequency power network, the diode by the step-down transformer
The DC output end of rectifier connects the dc-link capacitance；
Wherein, single quadrant drive converter is used to provide unipolar armature voltage and armature supply to the direct current generator
Armature rotor winding, the pwm converter be used for provide unipolar excitation voltage and exciting current to the direct current generator
Stator excitation winding.
2. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
Single quadrant drive converter is stated including the first power switch pipe and the first fly-wheel diode；
The emitter stage of first power switch pipe connects the negative electrode of first fly-wheel diode；
The anode of the colelctor electrode of first power switch pipe and first fly-wheel diode connects respectively the dc bus
The positive pole and negative pole of electric capacity；
The negative electrode and anode of first fly-wheel diode connect respectively the armature rotor winding of the direct current generator positive pole and
Negative pole.
3. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
Pwm converter is stated including the second power switch pipe and the second fly-wheel diode；
The emitter stage of second power switch pipe connects the negative electrode of second fly-wheel diode；
The anode of the colelctor electrode of second power switch pipe and second fly-wheel diode connects respectively the dc bus
The positive pole and negative pole of electric capacity；
The negative electrode and anode of second fly-wheel diode connect respectively the stator excitation winding of the direct current generator positive pole and
Negative pole.
4. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
Diode rectifier is stated including six commutation diodes；
Six commutation diodes are in parallel with the dc-link capacitance after series aiding connection two-by-two；
Three phase connections of the step-down transformer connect respectively the junction of the commutation diode of series connection.
5. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
Wind power generating set is stated including wind energy conversion system, gear-box, synchronous generator；
The wind energy conversion system is mechanically connected by the gear-box with the synchronous generator；
The stator winding of the synchronous generator connects the rotor windings of the double feedback electric engine.
6. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
Single quadrant drive converter is stated using double-closed-loop control algorithm；
Rotary speed setting value and corresponding measured value of the proportional and integral controller of rotating speed outer shroud according to the variable frequency transformer
Difference obtain the armature rotor winding current set-point of the direct current generator, the armature rotor winding current set-point it is upper
Limit is set as the rated current of single quadrant drive converter, and the lower limit set of the armature rotor winding current set-point is
Zero；
The proportional and integral controller of current inner loop according to the armature rotor winding current set-point of the direct current generator with it is corresponding
The difference of measured value obtains the dutycycle of single quadrant drive converter.
7. it is according to claim 6 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
The rotary speed setting value for stating variable frequency transformer controls to calculate with specific reference to the measuring wind speed in real time and maximal wind-energy capture of wind energy conversion system
Method is calculated.
8. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
State pwm converter to be controlled by exciting current closed loop control algorithm；
The pwm converter proportional and integral controller according to the stator excitation winding given value of current value of the direct current generator with it is right
The deviation of the measured value answered calculates the dutycycle of the pwm converter；
The Exciting Windings for Transverse Differential Protection given value of current value is calculated with specific reference to the real-time measurement rotating speed of wind power generating set.
9. it is according to claim 1 it is a kind of based on single quadrant converter weak magnetic control wind power system, it is characterised in that institute
The wind power generating set for stating the rotor windings connection of double feedback electric engine is a group or more of.
10. a kind of wind power system operation method controlled based on single quadrant converter weak magnetic, is appointed based in such as claim 1 to 9
A kind of wind power system controlled based on single quadrant converter weak magnetic described in meaning one is run, it is characterised in that included：
When wind speed rises, single quadrant drive converter of variable frequency transformer and pwm converter control DC motor speed
Decline, the rotating speed for making wind power generating set rises, while discharging the rotation energy storage of double feedback electric engine and direct current generator to compensate wind-force
The rotation energy storage of generating set；
When wind power generating set runs on rated speed, single quadrant drive converter of variable frequency transformer and excitation are converted
It is zero that device controls DC motor speed；
When wind speed decreased, single quadrant drive converter of variable frequency transformer and pwm converter control DC motor speed
Rise, the rotating speed for making wind power generating set declines, while absorbing the rotation energy storage of wind power generating set to double feedback electric engine and direct current
The rotation energy storage of motor；During the rotating speed of wind power generating set is with wind speed decreased, if the armature rotor of direct current generator
Control voltage needed for winding exceedes the safety of the first power switch pipe and the first fly-wheel diode in single quadrant drive converter
Voltage, then reduce the Exciting Windings for Transverse Differential Protection given value of current value of pwm converter, realizes most strong wind of the wind power generating set in low wind speed section
Can capture.
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| CN201710091005.3A CN106602611B (en) | 2017-02-20 | 2017-02-20 | Wind power system based on single-quadrant converter flux weakening control and operation method thereof |
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