CN105932714A - Dual-motor wind power generator grid-connection apparatus, wind power generator and grid-connection control method - Google Patents
Dual-motor wind power generator grid-connection apparatus, wind power generator and grid-connection control method Download PDFInfo
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- CN105932714A CN105932714A CN201610431200.1A CN201610431200A CN105932714A CN 105932714 A CN105932714 A CN 105932714A CN 201610431200 A CN201610431200 A CN 201610431200A CN 105932714 A CN105932714 A CN 105932714A
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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
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- 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
The invention discloses a dual-motor wind power generator grid-connection apparatus, a wind power generator and a grid-connection control method. The grid-connection apparatus comprises a first generator-side switch, a second generator-side switch, an asynchronous motor soft starting switch, a generator-side big current converter, a generator-side small current converter, a grid-side current converter, a grid-side switch and an asynchronous motor grid-connection switch; the wind power generator comprises a fan main body, a synchronous generator, an asynchronous generator and the grid-connection apparatus; and the grid-connection control method comprises the steps of carrying out grid connection and off-grid control on the asynchronous generator and the asynchronous generator according to wind speed. One grid-connection apparatus can be shared by two or more motors; the grid-connection soft starting apparatus of the asynchronous generator is implemented through a part of structure of the full-power current converter; the power distribution of the generator-side big current converter and the generator-side small current converter, and the permanent magnet asynchronous generator and the asynchronous generator is realized; non-impact grid connection and non-disturbance switching are achieved; and an additional soft starting apparatus and an additional reactive compensation apparatus are not required, so that the cost is lowered and the reliability is improved.
Description
Technical field
The present invention relates to wind-driven generator, be specifically related to a kind of bi-motor wind-driven generator grid-connecting apparatus, wind
Power generator and grid-connected control method.
Background technology
Along with advanced person's manufacture, computer technology, the development of Power Electronic Technique, wind power generating set is towards big merit
Rate direction is developed, and especially offshore wind farm uses the generating set of more than 5MW substantially.But it is as unit
The increase of power, the design difficulty of several critical components, the manufacture difficulty such as generator, booster engine, current transformer
To be substantially increased with cost.For solving the problems referred to above, domestic and international producer proposes double-generator one after another or generates electricity more
Machine system, the technical scheme of employing is as follows: install multiple little generating on a high-power blower generating set
Machine, installation form is divided into:
(1) one enters the gearbox having more, and each output shaft carries a generator respectively；
(2) double armature hybrid excitation generator；
(3) rotor and the stator of many group generators are installed on the power transmission shaft that wheel hub drives, even use Multi-stage transmission
Scheme；
(4) other also have the scheme being respectively mounted a generator in wind wheel both sides.
To sum up the purpose of scheme is for separate unit high-power generator, current transformer are split as multiple stage to reduce
Power grade, reduces technical difficulty, manufacture difficulty and cost.Use such scheme, although separate unit generator
It is split as multiple stage generator, but requires that every generator is equipped with a unsteady flow grid-connecting apparatus, price is the most higher,
System is succinct not, and different motor off-grid switching shock are difficult to eliminate.
Summary of the invention
In view of this, it is an object of the invention to provide one and can realize bi-motor or many motors share one also
Net device, and bi-motor wind-driven generator grid-connecting apparatus that is grid-connected without impact and that switch, wind-power electricity generation can be realized
Machine and grid-connected control method.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
First, the present invention provides a kind of bi-motor wind-driven generator grid-connecting apparatus, switch including the first pusher side,
Second pusher side switch, soft of asynchronous machine switch, the big current transformer of pusher side, the little current transformer of pusher side, net side unsteady flow
Device, net side switch and the grid-connected switch of asynchronous machine, the input of the big current transformer of described pusher side passes through the first pusher side
Switch is connected with the synchronous generator of bi-motor wind-driven generator, and the input of the little current transformer of described pusher side passes through
Second pusher side switch is connected with the synchronous generator of bi-motor wind-driven generator, and the little current transformer of described pusher side
Input is connected with the asynchronous generator of bi-motor wind-driven generator also by soft of asynchronous machine switch, described
The input of the big current transformer of pusher side, the output of the little current transformer of pusher side and net side converter is in parallel, described net side
The output of current transformer is connected with the step-up transformer of electrical network by net side switch, and described asynchronous machine is grid-connected to be opened
Close and be serially connected between the output of asynchronous generator and the step-up transformer of electrical network, the big current transformer of described pusher side
The power of power current transformer less than pusher side is big.
Secondly, the present invention provides a kind of wind-driven generator, including fan main body, synchronous generator and asynchronous
Motor, described synchronous generator is connected with the output shaft of fan main body respectively with asynchronous generator, described synchronization
The output of generator and asynchronous generator is provided with aforesaid bi-motor wind-driven generator grid-connecting apparatus.
Again, the present invention also provides for the grid-connected control method of a kind of aforementioned bi-motor wind-driven generator, including under
State the step of cutting-in control:
1) when wind speed is more than standby wind speed, less than when cutting wind speed V0, and closed net side switchs, starts net side
Current transformer carries out net side chain synchronised, and bi-motor wind-driven generator is in holding state；
2) when wind speed reaches the incision wind speed V0 set, the first pusher side switch and big current transformer of pusher side is closed,
Synchronous generator is connected to the grid；When wind speed is between the wind speed V1 cutting wind speed V0, setting, pass through
The big current transformer of pusher side, net side converter control the torque of synchronous generator, make fan main body remain optimal
Tip speed ratio catches to obtain maximal wind-energy, and when wind speed is equal to wind speed V1, synchronous generator reaches specified
Power；
3) when wind speed wind speed V1, setting wind speed V2 between time, close second pusher side switch, pusher side
Little current transformer, controls synchronous generator and is in super generating state, when wind speed is equal to wind speed V2, and synchronous generator
The power output of machine limits power output equal to maximum；
4) when wind speed is equal to wind speed V2, disconnect the second pusher side switch, close the little current transformer of pusher side, keep
The rated power that power is synchronous generator that the big current transformer of pusher side loads so that the electromagnetism merit of synchronous generator
Rate reduces forces fan main body to accelerate to drive the rotor of asynchronous generator to accelerate, when the rotor of asynchronous generator turns
When speed is close to its synchronous rotational speed, close soft of asynchronous machine switch, start the little current transformer of pusher side and control asynchronous
Generator starts grid-connected, keeps the setting time after asynchronous generator is the most grid-connected, and Guan Bi asynchronous machine is grid-connected
Switch, soft of asynchronous machine of disconnection switch and stop the little current transformer of pusher side, are connected directly to by asynchronous generator
The step-up transformer of electrical network, now wind speed is equal to wind speed V3；
5) when wind speed wind speed V3, setting wind speed V4 between time, by the big current transformer of pusher side, net side
Current transformer controls torque and the power of synchronous generator, makes synchronous generator be in rated power operation, simultaneously
Control the rotating speed of whole fan main body, and then control revolutional slip and the power of asynchronous generator, by net side unsteady flow
Unnecessary power headroom is carried out the idle asynchronous generator that is transformed to by device provides capacitive reactive power to compensate；When wind speed etc.
When wind speed V4, the power output of asynchronous generator is its rated power；
6) when wind speed wind speed V4, setting rated wind speed V5 between time, synchronous generator, asynchronous
Motor is in rated power operation, when wind speed exceedes rated wind speed V5, by pitch control blower fan master
The power of the assembling unit is limited by body.
Preferably, described step 3) in maximum limit the rated power that power output is the big current transformer of pusher side
1.1 times, now general be the most also not up to synchronous motor maximum firm power；Optionally use specified merit
The slightly higher synchronous motor of rate is to improve security.
Preferably, present invention additionally comprises following off-grid control step:
S1) when wind speed exceedes rated wind speed V5, by pitch control fan main body, the power of the assembling unit is carried out
Limit；When wind speed rated wind speed V5, setting wind speed V4 between time, synchronous generator, asynchronous generating
Machine is in rated power operation；
S2) when wind speed is equal to wind speed V4, the power output of asynchronous generator is its rated power；Work as wind
Speed wind speed V4, setting wind speed V3 between time, by the big current transformer of pusher side, net side converter control with
The torque of step generator and power, make synchronous generator be in rated power operation, control whole blower fan simultaneously
The rotating speed of main body, and then control revolutional slip and the power of asynchronous generator, by net side converter by unnecessary merit
Rate surplus carries out the idle asynchronous generator that is transformed to provides capacitive reactive power to compensate；When wind speed is equal to wind speed V3,
Guan Bi soft of asynchronous machine switch, the startup little current transformer of pusher side also disconnect the grid-connected switch of asynchronous machine, utilize machine
The little current transformer in side carries out soft stop control to asynchronous machine；
S3) when wind speed wind speed V3, setting wind speed V2 between time, by the big current transformer of pusher side, net side
Current transformer controls torque and the power of synchronous generator, makes synchronous generator be in rated power operation, continues
Control the rotating speed of whole fan main body, and then control revolutional slip and the power of asynchronous generator, by net side unsteady flow
Unnecessary power headroom is carried out the idle asynchronous generator that is transformed to by device provides capacitive reactive power to compensate；When wind speed etc.
When wind speed V2, disconnect soft of asynchronous machine switch, stop the little current transformer of pusher side by asynchronous generator off-grid；
S4) when wind speed wind speed V2, setting wind speed V1 between time, close second pusher side switch, pusher side
Little current transformer, controls synchronous generator and is in super generating state, when wind speed is equal to wind speed V2, and synchronous generator
The power output of machine limits power output equal to maximum；When wind speed is equal to wind speed V1, synchronous generator
Power output is equal to rated power；
S5) when wind speed wind speed V1, setting incision wind speed V0 between time, by the big current transformer of pusher side,
Net side converter controls the torque of synchronous generator, and optimum tip-speed ratio is to obtain to make fan main body remain
Maximal wind-energy catches, and when wind speed is equal to incision wind speed V0, disconnects the first pusher side switch and big unsteady flow of pusher side
Device, by synchronous generator off-grid, bi-motor wind-driven generator is in holding state.
Preferably, present invention additionally comprises and following be controlled the step that mode selects: first detect current wind speed
Situation of change, if current wind speed increases, then carry out cutting-in control according to current wind speed, if current wind
Speed reduces, then carry out off-grid control according to current wind speed.
The bi-motor wind-driven generator grid-connecting apparatus of the present invention has an advantage that
1, the present invention includes that the first pusher side switch, the second pusher side switch, soft of asynchronous machine switch, pusher side are big
The little current transformer of current transformer, pusher side, net side converter, net side switch and the grid-connected switch of asynchronous machine, can be equal to
Being considered as a full power convertor, pusher side includes small one and large one two, the big current transformer of pusher side, the little current transformer of pusher side
Rectification/inverter, net side is the overall rectification/inverter of net side converter one, and the big current transformer of pusher side is through first
Pusher side switch connects the stator of synchronous generator, the little current transformer of pusher side connects asynchronous through soft switch of asynchronous machine
The stator of generator；The little current transformer of pusher side is provided with other road the second pusher side switch and synchronous motor simultaneously
Stator connects, and it forms the structure that current transformer big with pusher side is in parallel；The stator of asynchronous generator is by different simultaneously
Walking the grid-connected switch of motor and be connected to step-up transformer, net side converter is direct and boosting transformation through net side switch
Device connects and then is connected into electrical network, and the present invention can realize bi-motor or many motors share a grid-connecting apparatus,
The grid-connected starting device as asynchronous generator is realized, it is achieved machine by a part of structure of full power convertor
The big current transformer in side distributes with asynchronous generating acc power with the little current transformer of pusher side, synchronous generator, can realize without punching
Hit grid-connected and switching undisturbed, it is not necessary to extra soft lifting device and reactive power compensator, reduce cost, raising
Reliability.
2, the pusher side of the present invention includes the big current transformer of pusher side, the little current transformer of pusher side totally two current transformers, and pusher side is big
The power of the power current transformer less than pusher side of current transformer is big, and the big current transformer of pusher side is synchronous generator total power phase
The relatively high power of coupling；And the small-power current transformer that the little current transformer of pusher side is soft of asynchronous generator, pusher side is little
The power of current transformer is only asynchronous generator flat-out 1/4 to 1/3, provides super generating for synchronous generator simultaneously
Power controls.
3, the net side of the present invention only comprises one current transformer of net side converter, and it has five functions: (I) conduct
Synchronous generator total power is grid-connected and power adjusting；(II) soft as asynchronous generator drives and grid-connected；(III)
Power regulation device as whole Wind turbines；(IV) as the super generating power conversion of synchronous generator；(V)
Reactive power compensator as asynchronous generator.
4, the present invention substantially may make up redundant system, when synchronous motor damages, can close asynchronous machine
Soft switch, realizes asynchronous generator low wind speed small-power speed change by the little current transformer of pusher side, net side converter
Constant frequency generation；If the second pusher side switch, asynchronous generator capacity increased, asynchronous generator also can be realized
In low wind speed variable speed constant frequency full power generating, although increasing more cost, can but raising can actually be reached
Purpose by property.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.At accompanying drawing
In:
Fig. 1 is the structural representation of the embodiment of the present invention；
Fig. 2 is the course of work schematic diagram of the embodiment of the present invention；
Fig. 3 is the power curve schematic diagram of the embodiment of the present invention；
Description of reference numerals: 1, the first pusher side switch；2, the second pusher side switch；3, asynchronous machine is soft
Play switch；4, the big current transformer of pusher side；5, the little current transformer of pusher side；6, net side converter；7, net side is opened
Close；8, the grid-connected switch of asynchronous machine；9, fan main body；91, synchronous generator；92, asynchronous generating
Machine；10, step-up transformer.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment
Can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.In the present invention,
Term " first ", " second " are mainly used in distinguishing different parts, but specifically do not limit parts.
As depicted in figs. 1 and 2, the bi-motor wind-driven generator grid-connecting apparatus of the present embodiment includes that the first pusher side is opened
Close 1, second pusher side switch 2, soft of asynchronous machine switch 3, the big current transformer of pusher side 4, the little current transformer of pusher side 5,
Net side converter 6, net side switch 7 and the grid-connected switch of asynchronous machine 8, the input of the big current transformer of pusher side 4 passes through
First pusher side switch 1 is connected with the magneto alternator 91 of bi-motor wind-driven generator, the little current transformer of pusher side 5
Input 2 be connected with the magneto alternator 91 of bi-motor wind-driven generator by the second pusher side switch, and
The input of the little current transformer of pusher side 5 is also by soft of asynchronous machine switch 3 and bi-motor wind-driven generator asynchronous
Generator 92 is connected, the big current transformer of pusher side 4, the output of the little current transformer of pusher side 5 and the input of net side converter 6
End parallel connection, the output of net side converter 6 is connected with the step-up transformer 10 of electrical network by net side switch 7, different
The step grid-connected switch of motor 8 is serially connected between the output of asynchronous generator 92 and the step-up transformer 10 of electrical network, machine
The power of the power current transformer less than pusher side 5 of the big current transformer in side 4 is big.In the present embodiment, the big current transformer of pusher side 4,
The little current transformer of pusher side 5, net side converter 6 are coupled by dc bus；First pusher side switch 1, second
Pusher side switch 2, soft of asynchronous machine switch 3, net side switch 7 and the grid-connected switch of asynchronous machine 8 are for being suitable for wind
The breaker of electricity system or contactor；The big current transformer of pusher side 4, the little current transformer of pusher side 5, net side converter 6 are suitable
Bi-directional electric power electronic converter together in wind power system.
The switch of the first pusher side switch 1 that the big current transformer of pusher side of the present invention 4 is connected with magneto alternator 91 holds
The power (namely rated power of magneto alternator 91) measuring current transformer 4 big with pusher side mates, the little change of pusher side
The second pusher side switch 2, the little current transformer of pusher side 5 and the asynchronous generator that stream device 5 is connected with magneto alternator 91
Contact capacity all little with pusher side current transformer 5 power match of soft of the asynchronous machine switch 3 that 92 connect, net side becomes
The contact capacity of the net side switch 7 that stream device 6 is connected with step-up transformer 10 and net side converter 6 power match, different
The contact capacity of step generator 92 switch grid-connected with the asynchronous machine that step-up transformer 10 is connected 8 and asynchronous generating
The rated power coupling of machine 92.Such as, if the rated power of magneto alternator 91 is 2000kW,
The big super generating value limiting power output corresponding is 10%, then the big current transformer of pusher side 4 and the appearance of the first pusher side switch 1
Amount is 2000kVA, and the capacity of the little current transformer of pusher side 5 and the second pusher side switch 2 all should be greater than 200kVA；As
Really the rated power of asynchronous generator 92 is 2000kW, then the little current transformer of pusher side 5 and the second pusher side switch 2, different
The capacity of step soft of motor switch 3 only need to arrange 500kVA and can meet requirement, and asynchronous machine is grid-connected simultaneously opens
The capacity closing 8 is 2000kVA；The capacity of net side converter 6 and net side switch 7 is 2500kVA.
The wind-driven generator of application the present embodiment bi-motor wind-driven generator grid-connecting apparatus includes fan main body 9, forever
Magnetic-synchro generator 91 and asynchronous generator 92, the rotor of magneto alternator 91 is with fan main body 9 machinery even
Connecing, the rotor of asynchronous generator 92 is mechanically connected with fan main body 9, magneto alternator 91 and asynchronous generating
The output of machine 92 is provided with the present embodiment aforesaid bi-motor wind-driven generator grid-connecting apparatus.Application the present embodiment
As a example by the wind-driven generator of bi-motor wind-driven generator grid-connecting apparatus is 4MW Wind turbines, wherein permanent-magnet synchronous
Generator 91 is specially 2MW permagnetic synchronous motor, and asynchronous generator 92 is specially 2MW squirrel cage induction motor,
The most such as 3MW Wind turbines, use 2MW permagnetic synchronous motor and 1MW squirrel cage induction motor to combine,
1.5MW magneto alternator and the combination of 1.5MW squirrel cage induction motor all can use the present embodiment bi-motor
Wind-driven generator grid-connecting apparatus；For another example 8MW Wind turbines, uses two set the present embodiment bi-motor wind-power electricity generations
Machine grid-connecting apparatus is combined getting final product simple realization.Certainly, the wind-driven generator of the present embodiment does not limits to
Which kind of concrete installation form and particular type is used in magneto alternator 91 and asynchronous generator 92,
It is also not limited to magneto alternator 91 and the quantity of asynchronous generator 92.
It is not difficult to find out, the wind-driven generator of the present embodiment or a redundant system: when permagnetic synchronous motor 91
During damage, the grid-connected switch of asynchronous machine 8 can be closed, be realized by the little current transformer of pusher side 5, net side converter 6
Asynchronous generator 92 low wind speed small-power variable speed constant frequency generator；If by second pusher side switch 2, asynchronous machine soft
Play switch 3 capacity and increase to 2000kVA, also can realize low wind speed variable speed constant frequency full power in asynchronous generator 92
Generating, although increasing more cost, but can actually reach to improve the purpose of reliability.
The wind-driven generator of the present embodiment uses brand-new bi-motor wind-driven generator grid-connecting apparatus, it is achieved asynchronous
The bi-motor generating set of motor and permagnetic synchronous motor composition realizes without impact grid-connected, and offer is corresponding also
Network control method.See Fig. 2, the cutting-in control side of the claim 2 bi-motor wind-driven generator of the present embodiment
Method, including the step of following cutting-in control:
1) when wind speed is more than standby wind speed, less than when cutting wind speed V0, and closed net side switchs 7, starts net side
Current transformer 6 carries out net side chain synchronised, and bi-motor wind-driven generator is in holding state；
2) when wind speed reaches the incision wind speed V0 set, the first pusher side switch 1 and big current transformer of pusher side is closed
4, magneto alternator 91 is connected to the grid；When wind speed wind speed V0, setting wind speed V1 between time,
Controlled the torque of magneto alternator 91 by the big current transformer of pusher side 4, net side converter 6, make fan main body 9
Remain that optimum tip-speed ratio catches to obtain maximal wind-energy, when wind speed is equal to wind speed V1, permanent-magnet synchronous
Generator 91 reaches rated power；
3) when wind speed wind speed V1, setting wind speed V2 between time, close second pusher side switch 2, pusher side little
Current transformer 5, controls magneto alternator 91 and is in super generating state, when wind speed is equal to wind speed V2, and permanent magnetism
The power output of synchronous generator 91 limits power output equal to maximum；
4) when wind speed is equal to wind speed V2, disconnect the second pusher side switch 2, close the little current transformer of pusher side 5, protect
Hold the rated power that power is magneto alternator 91 that pusher side big current transformer 4 loads so that permanent-magnet synchronous is sent out
The electromagnetic power of motor 91 reduces forces fan main body 9 to accelerate to drive the rotor of asynchronous generator 92 to accelerate, when different
When the rotor speed of step generator 92 is close to its synchronous rotational speed, Guan Bi soft of asynchronous machine switch 3, start pusher side
Little current transformer 5 also controls asynchronous generator 92 and starts grid-connected, keeps the setting time to treat asynchronous generator 92 the most also
After net, the Guan Bi grid-connected switch of asynchronous machine 8, disconnection soft of asynchronous machine switch 3 also stop the little current transformer of pusher side 5,
Asynchronous generator 92 is connected directly to the step-up transformer 10 of electrical network, and now wind speed is equal to wind speed V3；
5) when wind speed wind speed V3, setting wind speed V4 between time, by the big current transformer of pusher side 4, net side become
Stream device 6 controls torque and the power of magneto alternator 91, makes magneto alternator 91 be in rated power
Run, control the rotating speed of whole fan main body 9 simultaneously, and then control revolutional slip and the power of asynchronous generator 92,
By net side converter 6, unnecessary power headroom is carried out the idle asynchronous generator 92 that is transformed to and capacitive reactive power is provided
Compensate；When wind speed is equal to wind speed V4, the power output of asynchronous generator 92 is its rated power；
6) when wind speed wind speed V4, setting rated wind speed V5 between time, magneto alternator 91, different
Step generator 92 is in rated power operation, when wind speed exceedes rated wind speed V5, passes through pitch control
The power of the assembling unit is limited by fan main body 9.
As it is shown on figure 3, wherein curve (1) is the gross output curve of wind power generating set, curve (2)
For the output power curve of magneto alternator 91, curve (3) is that the power output of asynchronous generator 92 is bent
Line；Region (a) is grid-connected wind speed tracing area (c-max region), i.e. V0-V4 region, region (b)
For the super generating region of magneto alternator 91, i.e. V1-V2 region；Region (c) is asynchronous generator 92
De-also web area, i.e. V2-V3 region.
In the present embodiment, step 3) in maximum limit the rated power that power output is the big current transformer of pusher side 4
1.1 times, i.e. the super generating amount in super generating state is 10%, but not less than the maximum peace of magneto alternator 91
Total power, alternatively even selects the slightly larger permagnetic synchronous motor of rated power to improve security.
See Fig. 2, in the present embodiment, also include the step that following off-grid controls:
S1) when wind speed exceedes rated wind speed V5, by pitch control fan main body 9, the power of the assembling unit is carried out
Limit；When wind speed rated wind speed V5, setting wind speed V4 between time, magneto alternator 91, asynchronous
Generator 92 is in rated power operation；
S2) when wind speed is equal to wind speed V4, the power output of asynchronous generator 92 is its rated power；Work as wind
Speed wind speed V4, setting wind speed V3 between time, controlled forever by the big current transformer of pusher side 4, net side converter 6
The torque of magnetic-synchro generator 91 and power, make magneto alternator 91 be in rated power operation, simultaneously
Control the rotating speed of whole fan main body 9, and then control revolutional slip and the power of asynchronous generator 92, net side become
Unnecessary power headroom is carried out the idle asynchronous generator 92 that is transformed to by stream device 6 provides capacitive reactive power to compensate；Work as wind
When speed is equal to wind speed V3, Guan Bi soft of asynchronous machine switch 3, the startup little current transformer of pusher side 5 also disconnect asynchronous electricity
The grid-connected switch of machine 8, is controlled asynchronous generator 92 by the little current transformer of pusher side 5 and carries out soft off-grid；
S3) when wind speed wind speed V3, setting wind speed V2 between time, by the big current transformer of pusher side 4, net side
Current transformer 6 controls torque and the power of magneto alternator 91, makes magneto alternator 91 be in specified merit
Rate is run, and continues to control the rotating speed of whole fan main body 9, and then controls revolutional slip and the merit of asynchronous generator 92
Rate, by net side converter 6 unnecessary power headroom carried out idle be transformed to asynchronous generator 92 provide capacitive without
Merit compensates；When wind speed is equal to wind speed V2, disconnects soft of asynchronous machine switch 3, stop the little current transformer of pusher side 5
By asynchronous generator 92 off-grid；
S4) when wind speed wind speed V2, setting wind speed V1 between time, close second pusher side switch 2, pusher side
Little current transformer 5, controls magneto alternator 91 and is in super generating state, when wind speed is equal to wind speed V2, forever
The power output of magnetic-synchro generator 91 limits power output equal to maximum；When wind speed is equal to grid-connected wind speed V1
Time, the power output of magneto alternator 91 is equal to rated power；
S5) when wind speed wind speed V1, setting incision wind speed V0 between time, by the big current transformer of pusher side 4,
Net side converter 6 controls the torque of magneto alternator 91, makes fan main body 9 remain optimal blade tip speed
Than to obtain maximal wind-energy seizure, when wind speed is equal to incision wind speed V0, disconnect the first pusher side switch 1 and machine
The big current transformer in side 4, by magneto alternator 91 off-grid, bi-motor wind-driven generator is in holding state.
In being exactly in when wind speed is between wind speed V1, wind speed V2 during wind speed, and middle wind speed is wind-power electricity generation
The bigger wind speed region of probability of occurrence.By step 3 in the present embodiment) and S4) so that permanent-magnet synchronous
Generator 91 possesses the super generating ability in the short period, it is therefore an objective on the one hand can being increased by abovementioned steps
Generated energy during wind speed, improves the utilization rate of wind energy；On the other hand by step 4) and S3), the most permissible
There is provided between the stagnant ring region of power for the grid-connected of asynchronous generator 92 and off-grid, it is to avoid asynchronous generator 92 is the most grid-connected
With off-grid.
May not continue to increase in view of wind speed in actual environment or persistently reduce, therefore in the present embodiment,
Also include following being controlled the step that mode selects: first detect the situation of change of current wind speed, if worked as
Front wind speed increases, then carry out cutting-in control according to current wind speed, if current wind speed reduces, then according to current
Wind speed carries out off-grid control, thus realizes magneto alternator 91, both asynchronous generators 92 basis
The auto-parallel of wind speed situation of change, off-grid control.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (6)
1. a bi-motor wind-driven generator grid-connecting apparatus, it is characterised in that: include first pusher side switch (1),
Second pusher side switch (2), soft of asynchronous machine switch (3), the big current transformer of pusher side (4), the little unsteady flow of pusher side
Device (5), net side converter (6), net side switch (7) and the grid-connected switch of asynchronous machine (8), described pusher side
The synchronization that the input of big current transformer (4) switchs (1) and bi-motor wind-driven generator by the first pusher side is sent out
Motor (91) be connected, the input of the little current transformer of described pusher side (5) by second pusher side switch (2) and
The synchronous generator (91) of bi-motor wind-driven generator is connected, and the input of the little current transformer of described pusher side (5)
End is connected with the asynchronous generator (92) of bi-motor wind-driven generator also by soft of asynchronous machine switch (3),
The big current transformer of described pusher side (4), the output of the little current transformer of pusher side (5) and net side converter (6) defeated
Entering end parallel connection, the output of described net side converter (6) is by net side switch (7) and the liter buckling of electrical network
Depressor (10) is connected, and the grid-connected switch of described asynchronous machine (8) is serially connected in the output of asynchronous generator (92)
Between end and the step-up transformer (10) of electrical network, the power change less than pusher side of the big current transformer of described pusher side (4)
The power of stream device (5) is big.
2. a wind-driven generator, including fan main body (9), synchronous generator (91) and asynchronous generator
(92), described synchronous generator (91) and asynchronous generator (92) defeated with fan main body (9) respectively
Shaft is connected, it is characterised in that: described synchronous generator (91) and the output of asynchronous generator (92)
It is provided with the bi-motor wind-driven generator grid-connecting apparatus described in claim 1.
3. the grid-connected control method of bi-motor wind-driven generator described in a claim 2, it is characterised in that
Step including following cutting-in control:
1) when wind speed is more than standby wind speed, less than when cutting wind speed V0, and closed net side switchs (7), starts
Net side converter (6) carries out net side chain synchronised, and bi-motor wind-driven generator is in holding state；
2) when wind speed reaches the incision wind speed V0 set, close the first pusher side switch (1), start pusher side
Big current transformer (4), is connected to the grid synchronous generator (91)；When wind speed is in incision wind speed V0, setting
Time between wind speed V1, control synchronous generator (91) by the big current transformer of pusher side (4), net side converter (6)
Torque, make fan main body (9) remain optimum tip-speed ratio with obtain maximal wind-energy catch, work as wind speed
During equal to wind speed V1, synchronous generator (91) reaches rated power；
3) when wind speed wind speed V1, setting wind speed V2 between time, close second pusher side switch (2), open
The little current transformer in motivation side (5), controls synchronous generator (91) and is in super generating state, when wind speed is equal to wind speed
During V2, the power output of synchronous generator (91) limits power output equal to maximum；
4) when wind speed is equal to wind speed V2, disconnect the second pusher side switch (2), close the little current transformer of pusher side (5),
Keep the rated power that power is synchronous generator (91) that the big current transformer of pusher side (4) loads so that synchronize
The electromagnetic power of generator (91) reduces forces fan main body (9) to accelerate to drive asynchronous generator (92)
Rotor accelerates, and when the rotor speed of asynchronous generator (92) is close to its synchronous rotational speed, closes asynchronous machine
Soft switch (3), starts the little current transformer of pusher side (5) and controls asynchronous generator (92) and start grid-connected, protects
Hold the setting time after asynchronous generator (92) is the most grid-connected, the Guan Bi grid-connected switch of asynchronous machine (8), disconnected
Drive soft of asynchronous machine switch (3) and stop the little current transformer of pusher side (5), asynchronous generator (92) is direct
Being connected to the step-up transformer (10) of electrical network, now wind speed is equal to wind speed V3；
5) when wind speed wind speed V3, setting wind speed V4 between time, by the big current transformer of pusher side (4), net
Side converter (6) controls torque and the power of synchronous generator (91), makes synchronous generator (91) be in
Rated power operation, controls the rotating speed of whole fan main body (9) simultaneously, and then controls asynchronous generator (92)
Revolutional slip and power, net side converter (6) carry out unnecessary power headroom idle being transformed to asynchronous
Motor (92) provides capacitive reactive power to compensate；When wind speed is equal to wind speed V4, asynchronous generator (92) defeated
Going out power is its rated power；
6) when wind speed wind speed V4, setting rated wind speed V5 between time, synchronous generator (91), asynchronous
Generator (92) is in rated power operation, when wind speed exceedes rated wind speed V5, by becoming oar control
The power of the assembling unit is limited by fan main body processed (9).
The grid-connected control method of bi-motor wind-driven generator the most according to claim 3, it is characterised in that
Described step 3) in maximum limit the rated power that power output is the big current transformer of pusher side (4) 1.1 times.
The grid-connected control method of bi-motor wind-driven generator the most according to claim 3, it is characterised in that
Also include the step that following off-grid controls:
S1) when wind speed exceedes rated wind speed V5, by pitch control fan main body (9) to the power of the assembling unit
Limit；When wind speed is between rated wind speed V5, wind speed V4, synchronous generator (91), asynchronous
Motor (92) is in rated power operation；
S2) when wind speed is equal to wind speed V4, the power output of asynchronous generator (92) is its rated power；
When wind speed is between wind speed V4, wind speed V3, by the big current transformer of pusher side (4), net side converter (6)
Control torque and the power of synchronous generator (91), make synchronous generator (91) be in rated power operation,
Control the rotating speed of whole fan main body (9) simultaneously, and then control revolutional slip and the merit of asynchronous generator (92)
Rate, is carried out the idle asynchronous generator (92) that is transformed to by net side converter (6) by unnecessary power headroom and carries
Compensate for capacitive reactive power；When wind speed is equal to wind speed V3, close soft of asynchronous machine switch (3), starter motor
The little current transformer in side (5) also disconnects the grid-connected switch of asynchronous machine (8), utilizes the little current transformer of pusher side to asynchronous
Motor (92) carries out soft stop control；
S3) when wind speed is between wind speed V3, wind speed V2, by the big current transformer of pusher side (4), net side unsteady flow
Device (6) controls torque and the power of synchronous generator (91), makes synchronous generator (91) be in specified merit
Rate is run, and continues to control the rotating speed of whole fan main body (9), and then controls turning of asynchronous generator (92)
Rate and power, carried out unnecessary power headroom idle being transformed to asynchronous generator by net side converter (6)
(92) capacitive reactive power is provided to compensate；When asynchronous generator (92) rotating speed is close to synchronous rotational speed, disconnect different
Step soft of motor switch (3), the closedown little current transformer of pusher side (5) are by asynchronous generator (92) off-grid；
S4) when wind speed is between wind speed V2, wind speed V1, the second pusher side switch (2), little change of pusher side is closed
Stream device (5), controls synchronous generator (91) and is in super generating state, when wind speed is equal to wind speed V2, synchronizes
The power output of generator (91) limits power output equal to maximum；When wind speed is equal to wind speed V1, synchronize
The power output of generator (91) is equal to rated power；
S5) when wind speed wind speed V1, setting incision wind speed V0 between time, by the big current transformer of pusher side (4),
Net side converter (6) controls the torque of synchronous generator (91), makes fan main body (9) remain
Good tip speed ratio catches to obtain maximal wind-energy, when wind speed is equal to incision wind speed V0, disconnects the first pusher side and opens
Close (1) and the big current transformer of pusher side (4), by synchronous generator (91) off-grid, at bi-motor wind-driven generator
In holding state.
The grid-connected control method of bi-motor wind-driven generator the most according to claim 5, it is characterised in that
Also include following being controlled the step that mode selects: first detect the situation of change of current wind speed, if worked as
Front wind speed increases, then carry out cutting-in control according to current wind speed, if current wind speed reduces, then according to current
Wind speed carries out off-grid control.
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