CN106787459A - Wind power generator - Google Patents
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- CN106787459A CN106787459A CN201611270846.2A CN201611270846A CN106787459A CN 106787459 A CN106787459 A CN 106787459A CN 201611270846 A CN201611270846 A CN 201611270846A CN 106787459 A CN106787459 A CN 106787459A
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Abstract
The invention discloses a wind driven generator, relates to the field of wind power generation, and solves the problem that high-frequency circulation in the wind driven generator is large to have adverse effect on stable operation of the wind driven generator. The wind power generator comprises: at least one group of stator modules, wherein each group of stator modules comprises two symmetrical stator modules; each group of stator modules is connected with two parallel electric transmission links, and each electric transmission link comprises an inverter group; at least one transformer reactance module, each transformer reactance module connected with at least one electrical drive link, the transformer reactance modules configured to have a reactance such that a circuit resonant frequency of the parallel converter groups avoids a switching frequency of the converters in the converter groups. The invention can reduce the high-frequency circulation of the parallel converters and reduce the adverse effect on the stable operation of the wind driven generator.
Description
Technical field
The present invention relates to wind power generation field, more particularly to a kind of wind-driven generator.
Background technology
Due to the shortage of resource, sustainable resource is applied in increasing field.Such as by wind energy, solar energy
It is electric energy etc. sustainable resource conversion.In wind power generation field, electric energy is converted wind energy into by wind generator system, will turned
The electric energy that change is obtained is given by electrical grid transmission needs each machine of electricity consumption.
Generator in wind-driven generator includes stator and rotor, and stator will convert what is obtained by Electrified Transmission link
Electric energy is transferred to power network.Electrified Transmission link includes the current transformer of multiple parallel connections, due to the PWM between each current transformer
The difference of the physical device of (Pulse Width Modulation, pulse width modulation) drive signal so that multiple current transformers
Between switch time it is inconsistent.The carrier wave of current transformer is caused to there is certain phase difference, so that the current transformer of parallel connection exists
There are high frequency circulating currents higher between parallel connection point and dc bus, have harmful effect to the stable operation of wind-driven generator.
The content of the invention
A kind of wind-driven generator is the embodiment of the invention provides, current transformer (such as rectifier and/or inverse of parallel connection can be reduced
Become device) high frequency circulating currents, reduce the harmful effect to the stable operation of wind-driven generator.
A kind of wind-driven generator is the embodiment of the invention provides, including：At least one set of stator modules, every group of stator modules bag
Include two symmetrical stator modules；Electrified Transmission link, every group of stator modules are connected with two Electrified Transmission links of parallel connection, often
Bar Electrified Transmission link includes current transformer group；At least one transformation reactance module, each transformation reactance module and at least one
Electrified Transmission link connection, transformation reactance module is configured with so that the circuit resonant frequencies of current transformer group in parallel are avoided
The reactance of the converter switches frequency in current transformer group.
Further, when transformation reactance module is with two Electrified Transmission link connections in parallel, transformation reactance module bag
The double Split winding transformers of weak coupling are included, and two the two of Electrified Transmission link output ends of parallel connection are double with weak coupling respectively
Two windings correspondence of Split winding transformer low-pressure side is connected.
Further, when transformation reactance module and two Electrified Transmission link connections, transformation reactance module includes reactance
Device group and three-winding transformer, and two the two of Electrified Transmission link output ends of parallel connection are respectively connected with a reactor group,
Two output end of reactor group connections corresponding with two windings of three-winding transformer low-pressure side respectively.
Further, when transformation reactance module and N bar Electrified Transmission link connections, N is the even number more than 2, becomes piezoelectricity
Anti- module includes weak coupling N Split winding transformers, and N number of output end of N bar Electrified Transmission links is divided with weak coupling N respectively
The N number of winding correspondence for splitting winding transformer low-pressure side is connected.
Further, when transformation reactance module and N bar Electrified Transmission link connections, N is the even number more than 2, the change
Pressure reactance module includes reactor group and (N+1) winding transformer, and the N bar Electrified Transmission links in parallel N number of output
End is respectively connected with a reactor group, the output end of N number of reactor group respectively with (N+1) winding transformer low-pressure side it is N number of around
Group correspondence connection.
Specifically, current transformer group includes the rectifier being connected with stator modules and the inverter being connected with rectifier.
Specifically, each stator modules includes the stator winding more than a set of or a set of.
Specifically, each stator modules includes two sets of stator winding.
Further, phase is identical between two sets of stator winding, or phase differs 30 °, or phase differs 180 °
Specifically, in a set of stator winding and another stator modules in stator modules in one group of stator modules
A set of stator winding be connected with the current transformer group in an Electrified Transmission link, a stator mould in one group of stator modules
Another set of stator winding in another set of stator winding in block and another stator modules with another Electrified Transmission link
In current transformer group connection.
Further, the phase with two sets of stator winding of same Electrified Transmission link connection is identical.
A kind of wind-driven generator is the embodiment of the invention provides, the wind-driven generator includes at least one set of stator modules, fixed
The Electrified Transmission link of submodule connection, and at least one transformation reactance module, every group two of stator modules connection parallel connection
Electrified Transmission link, every Electrified Transmission circuit includes current transformer group, each transformation reactance module and at least one Electrified Transmission
Link connection, transformation reactance module is configured with so that the circuit resonant frequencies of current transformer group in parallel avoid current transformer group
In converter switches frequency reactance.By the reactance for setting transformation reactance module so that the change in parallel of wind-driven generator
The circuit resonant frequencies for flowing device group avoid the converter switches frequency of parallel connection, it is to avoid the circuit resonant frequencies of wind-driven generator and change
The switching frequency for flowing device is equal, so as to avoid the occurrence of the high frequency circulating currents of maximum, and reduces the current transformer of parallel connection in parallel connection point and straight
High frequency circulating currents between stream bus, reduce the harmful effect to the stable operation of wind-driven generator.
Brief description of the drawings
From below in conjunction with the accompanying drawings to be may be better understood in the description of specific embodiment of the invention the present invention wherein,
Same or analogous reference represents same or analogous feature.
Fig. 1 a include one group of schematic diagram of stator modules for the wind-driven generator that one embodiment of the invention is provided；
Fig. 1 b include two groups of schematic diagrames of stator modules for the wind-driven generator that one embodiment of the invention is provided；
The structural representation of the wind-driven generator that Fig. 2 is provided for one embodiment of the invention；
Fig. 3 is the structural representation of the wind-driven generator in an example of another embodiment of the present invention；
Fig. 4 is the structural representation of the wind-driven generator in another example of another embodiment of the present invention；
Fig. 5 is the structural representation of the wind-driven generator in the another example of another embodiment of the present invention；
Fig. 6 is the structural representation of the wind-driven generator in another example of another embodiment of the present invention；
Fig. 7 is the circuit diagram of the inverter parallel in the embodiment of the present invention；
Fig. 8 a are one of two equivalent circuit diagrams of inverter parallel in Fig. 7；
Fig. 8 b are two the two of the equivalent circuit diagram of inverter parallel in Fig. 7；
Fig. 8 c are two the three of the equivalent circuit diagram of inverter parallel in Fig. 7；
Fig. 8 d are two the four of the equivalent circuit diagram of inverter parallel in Fig. 7；
Fig. 9 is exchange steady-state equivalent circuit diagram corresponding with Fig. 8 c.
Wherein, G1, G2, G3, G4- stator modules；A1, A2, A3, A4- rectifier；B1, B2, B3, B4- inverter；10- electricity
Gas drive chain；11- transformation reactance modules；The double Split winding transformers of 12- weak couplings；13- reactors；14- three winding transformations
Device；15- weak coupling quadripartion winding transformers；16- five-winding transformers.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is better understood from just for the sake of being provided by showing example of the invention to of the invention.The present invention is never limited
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of part and algorithm.In the the accompanying drawings and the following description, known structure and skill is not shown
Art, to avoid that unnecessary obscuring is caused to the present invention.
One embodiment of the invention provides a kind of wind-driven generator, the wind-driven generator include at least one set of stator modules,
Electrified Transmission link, and at least one transformation reactance module.Wherein, every group of stator modules include two symmetrical stator moulds
Block.Such as, the wind-driven generator that Fig. 1 a are provided for one embodiment of the invention includes one group of schematic diagram of stator modules, such as Fig. 1 a institutes
Show, wind-driven generator includes stator modules G1 and G2, stator modules G1 and G2 can be the shape of annulus section, stator modules G1 and G2
It is combined into circular stator.Or, the wind-driven generator that Fig. 1 b are provided for one embodiment of the invention is comprising two groups of stator modules
Schematic diagram, as shown in Figure 1 b, wind-driven generator includes stator modules G1, G2, G3 and G4, and stator modules G1 and G3 are symmetrical two
Individual stator modules, are one group of stator modules, and stator modules G2 and G4 are two symmetrical stator modules, are one group of stator modules,
Stator modules G1, G2, G3 and G4 can be the shape of annulus section, and stator modules G1, G2, G3 and G4 are combined into circular stator.Fig. 2
It is the structural representation of the wind-driven generator that one embodiment of the invention is provided, as shown in Fig. 2 every group of stator modules are connected with parallel connection
Two Electrified Transmission links 10, every Electrified Transmission link 10 includes current transformer group, specifically, current transformer group includes one
Or multiple current transformers, wherein, current transformer can be rectifier, or inverter.Each transformation reactance module 11 with least
One Electrified Transmission link 10 is connected, that is to say, that each transformation reactance module 11 can only with an Electrified Transmission link 10
Connection, each transformation reactance module 11 can also be connected with a plurality of Electrified Transmission link 10.Above-mentioned transformation reactance module 11 has
Transformation function, is configured with so that the current transformer that the circuit resonant frequencies of current transformer group in parallel are avoided in current transformer group is opened
Close the reactance of frequency.
Due to the switching frequency of the current transformer being connected in parallel it is equal with the resonant frequency of the circuit of wind-driven generator when, produce
High frequency circulating currents it is maximum.The available parameter of structure according to wind-power electricity generation of the prior art, can after being calculated according to parameter
To learn the corresponding reactance of current transformer group circuit resonant frequencies in parallel when making the high frequency circulating currents between current transformer maximum, pass through
The reactance of transformation reactance module is set, and so that the circuit resonant frequencies of current transformer group in parallel avoid the unsteady flow in current transformer group
Device switching frequency, to reduce the high frequency circulating currents between current transformer.Such as, it is calculated the current transformer group of parallel connection in wind-driven generator
When producing maximum high frequency circulating currents, the reactance of the circuit of the current transformer group of parallel connection is in 10 μ H (microhenry)~20 μ H or so, then can
There is the reactance of mH ranks to configure transformation reactance module, it is to avoid the circuit resonance of the current transformer group in parallel of wind-driven generator is frequently
Rate is equal with converter switches frequency, and so that is configured with the current transformer group in parallel of the wind-driven generator of transformation reactance module
Circuit resonant frequencies are away from converter switches frequency.
A kind of wind-driven generator is the embodiment of the invention provides, the wind-driven generator includes at least one set of stator modules, fixed
The Electrified Transmission link 10 of submodule connection, and at least one transformation reactance module 11, every group of stator modules connect parallel connection
Two Electrified Transmission links 10, every Electrified Transmission link includes current transformer group, each transformation reactance module 11 and at least one
Electrified Transmission link 10 is connected, and transformation reactance module 11 is configured with the circuit resonant frequencies of the current transformer group for causing in parallel
Avoid the reactance of the converter switches frequency in current transformer group, it is to avoid the circuit of the current transformer group in parallel of wind-driven generator is humorous
Vibration frequency is equal with converter switches frequency, so as to avoid the occurrence of the high frequency circulating currents of maximum, can be reduced relative to prior art
The high frequency circulating currents of current transformer in parallel between parallel connection point and dc bus, reduce the bad shadow to the stable operation of wind-driven generator
Ring.The reactance that setting transformation reactance module 11 has causes that the circuit resonant frequencies of the current transformer group of parallel connection are tried one's best away from current transformer
The reactance of the switching frequency of the current transformer in group, and further reduce height of the current transformer of parallel connection between parallel connection point and dc bus
Frequency circulation.
It should be noted that above-mentioned each stator modules include the stator winding more than a set of or a set of.Wind-driven generator
In transformation reactance module 11 have various structures, below will with each stator modules include two sets of stator winding come on illustrating
The various structures of the transformation reactance module 11 in wind-driven generator are stated, the current transformer group in wind-driven generator may include and stator mould
The rectifier of block connection, and the inverter being connected with rectifier.Rectifier is used to for alternating current to be converted to direct current, inverter
For direct current to be converted into alternating current.
Structure one：When transformation reactance module 11 is connected with two Electrified Transmission links 10 of parallel connection, transformation reactance module
11 include the double Split winding transformers 12 of weak coupling, and parallel connection two the two of Electrified Transmission link 10 output ends respectively with
Two low pressure windings correspondence of the double Split winding transformers 12 of weak coupling is connected.In a stator modules in one group of stator modules
A set of stator winding and another stator modules in a set of stator winding with an Electrified Transmission link 10 in unsteady flow
Device group is connected, another in the another set of stator winding in a stator modules in one group of stator modules and another stator modules
A set of stator winding is connected with the current transformer group in another Electrified Transmission link 10.Fig. 3 is another embodiment of the present invention
The structural representation of the wind-driven generator in one example.As shown in figure 3, wind-driven generator comprising stator modules G1, G2, G3 and
G4, wherein stator modules G1 and G3 are symmetrical, and G2 and G4 are symmetrical for stator modules.Stator modules G1 and G3 are connected with two electricity of parallel connection
Gas drive chain 10, stator modules G2 and G4 are connected with another two Electrified Transmission links 10 of parallel connection.Each transformation reactance module
11 are connected with two Electrified Transmission links 10 in parallel.Specifically, a set of stator winding and stator modules in stator modules G1
A set of stator winding in G3 is connected with rectifier A1, in the another set of stator winding and stator modules G3 in stator modules G1
Another set of stator winding is connected with rectifier A2.Similarly, in a set of stator winding and stator modules G4 in stator modules G2
A set of stator winding is connected with rectifier A3, another set of in the another set of stator winding and stator modules G4 in stator modules G2
Stator winding is connected with rectifier A4.Rectifier A1, A2, A3 and A4 connection corresponding with inverter B1, B2, B3, B4 respectively.Relatively
In stator modules G1 and G3, rectifier A1 and A2 are in parallel, and inverter B1, B2 are in parallel.Relative to stator modules G2 and G4, rectifier
A3 and A4 is in parallel, and inverter B3, B4 are in parallel.Inverter B1, B2 respectively with two low pressure of double Split winding transformers 12
Winding correspondence is connected, and inverter B3, B4 are corresponding with another pair of the two of Split winding transformer 12 low pressure winding respectively to be connected.
The high pressure winding output of two double Split winding transformers 12 of weak coupling is passed through power network.Transformation reactance module 11 is double points of weak coupling
Winding transformer 12 is split, the double Split winding transformers 12 of each weak coupling have a high pressure winding and two low pressure windings.It is weak
Two windings of secondary side (i.e. two of the low-pressure side of the double Split winding transformers 12 of weak coupling of the double Split winding transformers 12 of coupling
Individual winding) between reactance than larger, the change for enabling to the circuit resonant frequencies of the current transformer group of parallel connection to avoid in current transformer group
Stream device switching frequency.
Structure two：When transformation reactance module 11 is connected with two Electrified Transmission links 10, transformation reactance module 11 includes
Reactor group and three-winding transformer 14, and two the two of Electrified Transmission link 10 output ends of parallel connection are respectively connected with an electricity
Anti- device group, two output ends of reactor group respectively with 14 secondary side of three-winding transformer, two windings (i.e. three-winding transformer
Two windings of 14 low-pressure sides) correspondence connection.Reactor group includes at least one reactor.Wherein, three-winding transformer 14
Reactance can be less than or equal to high frequency circulating currents reactance threshold value, it is also possible to more than high frequency circulating currents reactance threshold value.High frequency circulating currents reactance threshold value
The numerical value of larger high frequency circulating currents is produced for the circuit that the current transformer in current transformer group in parallel is formed.If three-winding transformer 14
Reactance is less than or equal to high frequency circulating currents reactance threshold value between two windings of secondary side, then the three-winding transformer 14 is applied individually to any transformation
During reactance module 11, the circuit resonant frequencies of the circuit that the current transformer in current transformer group in parallel is formed are with the switch of current transformer frequently
Rate is equal or close, produces maximum or larger high frequency circulating currents.If reactance is big between three-winding transformer 14 secondary side, two windings
In high frequency circulating currents reactance threshold value, then when the three-winding transformer 14 is applied individually to any transformation reactance module 11, current transformer in parallel
The circuit resonant frequencies of the circuit that the current transformer in group is formed avoid the switching frequency of current transformer, will not produce the high frequency ring of maximum
Stream.If reactance is less than or equal to high frequency circulating currents reactance threshold value between three-winding transformer 14 secondary side, two windings, closed by setting
The reactor group of suitable reactance so that the reactor group that is set in transformation reactance module 11 and three-winding transformer 14 it is total equivalent
Reactance be more than high frequency circulating currents reactance threshold value, enable to parallel connection current transformer group in current transformer formed circuit circuit resonance
Frequency avoids the switching frequency of current transformer, so that the high frequency circulating currents in current transformer group in parallel in reducing wind-driven generator.If three
Reactance is more than high frequency circulating currents reactance threshold value, the then reactance in transformation reactance module 11 between winding transformer 14 secondary side, two windings
Device group can make parallel connection current transformer group in current transformer formed circuit circuit resonant frequencies away from current transformer switch frequently
Rate, so that the high frequency circulating currents in current transformer group in parallel in further lowering wind-driven generator.
It is a set of in a set of stator winding and another stator modules in a stator modules in one group of stator modules
Stator winding is connected with the current transformer group in an Electrified Transmission link 10, in a stator modules in one group of stator modules
Another set of stator winding and another stator modules in another set of stator winding with another Electrified Transmission link 10 in
Current transformer group connection.Fig. 4 is the structural representation of the wind-driven generator in another example of another embodiment of the present invention.Such as
Shown in Fig. 4, wind-driven generator includes stator modules G1, G2, G3 and G4, and wherein stator modules G1 and G3 is symmetrical, stator modules G2
It is symmetrical with G4.Stator modules G1 and G3 are connected with two Electrified Transmission links 10 of parallel connection, and stator modules G2 and G4 are connected with simultaneously
Another two Electrified Transmission links 10 of connection.Each transformation reactance module 11 is connected with two Electrified Transmission links 10 of parallel connection.Tool
Body, a set of stator winding in a set of stator winding and stator modules G3 in stator modules G1 is connected with rectifier A1, fixed
The another set of stator winding in another set of stator winding and stator modules G3 in submodule G1 is connected with rectifier A2.Similarly,
The a set of stator winding in a set of stator winding and stator modules G4 in stator modules G2 is connected with rectifier A3, stator modules
The another set of stator winding in another set of stator winding and stator modules G4 in G2 is connected with rectifier A4.Rectifier A1, A2,
A3 and A4 connection corresponding with inverter B1, B2, B3, B4 respectively.Relative to stator modules G1 and G3, rectifier A1 and A2 are in parallel,
Inverter B1, B2 are in parallel.Relative to stator modules G2 and G4, rectifier A3 and A4 are in parallel, and inverter B3, B4 are in parallel.Become piezoelectricity
Anti- module 11 includes reactor 13 and transformer 14.Wherein, transformer 14 is common low with a high pressure winding and two
Press the transformer 14 of winding.Setting each reactor group includes a reactor 13.As shown in figure 4, reactor 13 is defeated
Enter end be connected with the output end of the inverter B1 in an Electrified Transmission link 10, the input of another reactor 13 with it is another
The output end connection of the inverter B2 in bar Electrified Transmission link 10, two output ends of reactor 13 respectively with transformer 14
Two low pressure winding correspondences are connected, and the output of the high pressure winding of transformer 14 is passed through power network.Reactor 13 and transformer 14 it is total
Reactance causes the converter switches frequency that the circuit resonant frequencies of the current transformer group of parallel connection are avoided in current transformer group.
Structure three：When transformation reactance module 11 is connected with N bar Electrified Transmission link 10, N is the even number more than 2, transformation
Reactance module 11 include weak coupling N Split winding transformers, and N bar Electrified Transmission link 10 N number of output end respectively with it is weak
The N number of winding correspondence for coupling N Split winding transformer low-pressure sides is connected.In one group of stator modules in a stator modules one
Set stator winding and another stator modules in a set of stator winding with an Electrified Transmission link 10 in current transformer group
It is another set of in connection, another set of stator winding in a stator modules in one group of stator modules and another stator modules
Stator winding is connected with the current transformer group in another Electrified Transmission link 10.Fig. 5 is another for another embodiment of the present invention
The structural representation of the wind-driven generator in example.As shown in figure 5, wind-driven generator includes stator modules G1, G2, G3 and G4,
Wherein stator modules G1 and G3 is symmetrical, and G2 and G4 are symmetrical for stator modules.Stator modules G1 and G3 are connected with two of parallel connection electrically
Drive chain 10, stator modules G2 and G4 are connected with another two Electrified Transmission links 10 of parallel connection.Transformation reactance module 11 is weak
Coupling quadripartion winding transformer 15, is connected with four Electrified Transmission links 10.Specifically, a set of stator in stator modules G1
A set of stator winding in winding and stator modules G3 is connected with rectifier A1, the another set of stator winding in stator modules G1 and
Another set of stator winding in stator modules G3 is connected with rectifier A2.Similarly, a set of stator winding in stator modules G2 and
A set of stator winding in stator modules G4 is connected with rectifier A3, another set of stator winding and stator mould in stator modules G2
Another set of stator winding in block G4 is connected with rectifier A4.Rectifier A1, A2, A3 and A4 respectively with inverter B1, B2, B3,
B4 correspondences are connected.Relative to stator modules G1 and G3, rectifier A1 and A2 are in parallel, and inverter B1, B2 are in parallel.Relative to stator mould
Block G2 and G4, rectifier A3 and A4 are in parallel, and inverter B3, B4 are in parallel.Transformation reactance module 11 includes a weak coupling quadripartion
Winding transformer 15 (i.e. the weak coupling N Split winding transformers that N is equal to 4), with four low pressure windings and a high pressure winding.
Four windings of wherein inverter B1, B2, B3 and B4 and the low-pressure side of weak coupling quadripartion winding transformer 15 are connected respectively.
Reactance between four windings of the low-pressure side of weak coupling quadripartion winding transformer 15 causes that the circuit of the current transformer group of parallel connection is humorous
Vibration frequency avoids the switching frequency of the current transformer in current transformer group.
Structure four：When transformation reactance module 11 is connected with N bar Electrified Transmission link 10, N is the even number more than 2, transformation
Reactance module 11 include (N+1) winding transformer, and N bar Electrified Transmission link 10 N number of output end respectively with (N+1) winding
N number of winding correspondence of step down side is connected.A set of stator winding in a stator modules in one group of stator modules and
A set of stator winding in another stator modules is connected with the current transformer group in an Electrified Transmission link 10, one group of stator
Another set of stator winding in another set of stator winding in a stator modules in module and another stator modules with
Current transformer group connection in another Electrified Transmission link 10.Fig. 6 is the wind-force in another example of another embodiment of the present invention
The structural representation of generator.As shown in fig. 6, wind-driven generator includes stator modules G1, G2, G3 and G4, wherein stator modules
G1 and G3 is symmetrical, and G2 and G4 are symmetrical for stator modules.Stator modules G1 and G3 are connected with two Electrified Transmission links 10 of parallel connection, fixed
Submodule G2 and G4 are connected with another two Electrified Transmission links 10 of parallel connection.Transformation reactance module 11 is five-winding transformer 16,
It is connected with four Electrified Transmission links 10.Reactor group includes a reactor 13.Specifically, a set of fixed in stator modules G1
A set of stator winding in sub- winding and stator modules G3 is connected with rectifier A1, the another set of stator winding in stator modules G1
It is connected with rectifier A2 with the another set of stator winding in stator modules G3.Similarly, a set of stator winding in stator modules G2
It is connected with rectifier A3 with a set of stator winding in stator modules G4, another set of stator winding and stator in stator modules G2
Another set of stator winding in module G4 is connected with rectifier A4.Rectifier A1, A2, A3 and A4 respectively with inverter B1, B2,
B3, B4 correspondence are connected.Relative to stator modules G1 and G3, rectifier A1 and A2 are in parallel, and inverter B1, B2 are in parallel.Relative to fixed
Submodule G2 and G4, rectifier A3 and A4 are in parallel, and inverter B3, B4 are in parallel.Transformation reactance module 11 includes that five windings become
Depressor 16 (i.e. (N+1) winding transformer that N is equal to 4), with four low pressure windings and a high pressure winding.Wherein inverter
Four windings of B1, B2, B3 and B4 and the low-pressure side of five-winding transformer 16 are connected respectively.The reactance of five-winding transformer 16
High frequency circulating currents reactance threshold value can be less than or equal to, it is also possible to more than high frequency circulating currents reactance threshold value.If the electricity of five-winding transformer 16
It is anti-to be less than or equal to high frequency less than or equal to reactance between high frequency circulating currents reactance threshold value, and four windings of the low-pressure side of five-winding transformer 16
Circulation reactance threshold value, then by setting the reactor group of suitable reactance so that the reactor set in transformation reactance module 11
Group and five-winding transformer 16 total equivalent reactance be more than high frequency circulating currents reactance threshold value, enable to parallel connection current transformer group in
The resonant frequency of the circuit that current transformer is formed avoids the switching frequency of current transformer, so that unsteady flow in parallel in reducing wind-driven generator
High frequency circulating currents in device group.If reactance is more than high frequency circulating currents reactance threshold value between four windings of the low-pressure side of five-winding transformer 16,
Then the reactor group in transformation reactance module 11 can make the circuit of the circuit of the current transformer formation in the current transformer group of parallel connection humorous
Vibration frequency away from current transformer switching frequency so that the high frequency ring in current transformer group in parallel in further lowering wind-driven generator
Stream.
Fig. 7 is the circuit diagram of the inverter parallel in the embodiment of the present invention.As shown in fig. 7, six of upper part
IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) is an inverter, lower part
Six IGBT be another inverter.Fig. 8 a are one of two equivalent circuit diagrams of inverter parallel in Fig. 7, equivalent to Fig. 7
S in six IGBT of middle and upper part pointap1 and lower part six IGBT in Sap2 conductings, the both sides DC source of equivalent circuit
Polarity is identical, equal in magnitude, in the absence of circulation.Fig. 8 b be Fig. 7 in two the two of the equivalent circuit diagram of inverter parallel, equivalent to
S in six IGBT of Fig. 7 middle and upper parts pointan1 and lower part six IGBT in San2 conductings, the both sides direct current of equivalent circuit
Source polarity is identical, equal in magnitude, in the absence of circulation.Fig. 8 c are two the three of the equivalent circuit diagram of inverter parallel in Fig. 7, quite
S in six IGBT of Fig. 7 middle and upper parts pointap1 and lower part six IGBT in San2 conductings, the both sides of equivalent circuit are straight
Stream source polarity is conversely, form circulation.Fig. 8 d are two the four of the equivalent circuit diagram of inverter parallel in Fig. 7, in Fig. 7
S in six partial IGBTan1 and lower part six IGBT in Sap2 conductings, the both sides direct current source polarity of equivalent circuit
Conversely, forming circulation.When the carrier wave of inverter has certain phase difference, will there is such as Fig. 8 c and Fig. 8 d in inverter in parallel
Shown high frequency circulating currents.Fig. 9 is exchange steady-state equivalent circuit diagram corresponding with Fig. 8 c, wherein, LxWith rxRespectively in parallel two
The equivalent inductance (i.e. wiring inductance) and resistance of line, ω between inverterSIt is the switching frequency of inverter, IscIt is high frequency ring
Stream, remaining rL, rcIt is equivalent resistance, LfAnd CfIt is filter inductance and filter capacitor.Can be calculated according to following formula (1)
Obtain high frequency circulating currents Isc：
In order to calculate high frequency circulating currents IscSimplicity, and do not influence high frequency circulating currents and LxBetween qualitative relationships, it is negligible
rL、rcAnd rx, obtain following formula (2)：
It can be seen from formula, when the phase difference of carrier wave keeps constant, the peak value at switch circulation peak is with wiring inductance Lx
Change be not it is linear, can obtain maximum in certain value.When second resonant frequency of mesh in Fig. 9When switching frequency with inverter is equal, the high frequency circulating currents in wind-driven generator are maximum.Such as, root
Calculated according to the relevant parameter of a certain wind-driven generator and understood, the wiring inductance L for making high frequency circulating currents maximumxIn 10-20uH or so, can
To set the reactance of transformation reactance module 11 in mH ranks, resonant frequency can be avoided, so as to greatly reduce high frequency circulating currents.
It should be noted that Split winding transformer refers to every by a high pressure winding and two or more voltages and appearance
Measure the Multiple coil power transformer that the low pressure winding of all same is constituted.Fixed frequency, the fixed amplitude that inverter can be produced
AC energy, transmits to high pressure winding from low pressure winding, and the then effect with limiting short-circuit current in failure.And, by
It is relatively low in the cost of Split winding transformer, and simple, small volume is installed, therefore the cost of wind-driven generator can also be reduced.
A plurality of Electrified Transmission link 10 in wind-driven generator in above-described embodiment is each independent, if wind-driven generator bag
Four Electrified Transmission links 10 are included, then every gross output of the transmission a quarter of Electrified Transmission link 10.If indivedual stators
Module, rectifier, inverter, Split winding transformer break down, and only corresponding Electrified Transmission link 10 fails, only has
A part of power output is affected, and the Electrified Transmission link 10 not broken down remains able to normal work, transmits output work
Rate.Such as, the gross output of wind-driven generator is 6MW, then the power of every Electrified Transmission chain output is 1.5MW.When one
1 unit in the corresponding stator modules of Electrified Transmission link 10, rectifier, inverter, the low pressure winding of Split winding transformer
During part failure, the power output that can also realize wind-driven generator transmission is 4.5MW；When an Electrified Transmission link 10 is corresponding
During the high pressure winding failure of Split winding transformer, it is possible to achieve wind-driven generator transmission grid power is 3MW.The present invention is implemented
Wind-driven generator in example can stator modules, rectifier, inverter, transformer (including the double transformer with split windings 12 of weak coupling,
Three-winding transformer 14, weak coupling N Split winding transformers or (N+1) winding transformer) break down and cannot on-call maintenance
When, drop power fault-tolerant operation is realized, so as to reduce economic loss caused by wind-driven generator failure.
For it is above-mentioned including two sets of stator modules of stator winding for, phase is identical between two sets of stator winding, or
Phase differs 30 °, or phase differs 180 °.The phase phase of two sets of stator winding being connected with same Electrified Transmission link 10
Together.Such as, as shown in Fig. 2 phase between two sets of stator winding of stator modules G1 can be with identical, or phase differs 30 °, or
Phase differs 180 °.Stator modules G1 is connected with the stator winding positioned at outer shroud of G3 with the electric transmitting link road of same, stator
Module G1 is identical with the phase of the stator winding positioned at outer shroud of G3.
It should be noted that feature described above, structure or characteristic can be combined one in any suitable manner
In individual or more embodiment.In the following description, there is provided many details are filled so as to be given to embodiments of the invention
Sub-argument solution.It will be appreciated, however, by one skilled in the art that technical scheme can be put into practice without in specific detail
It is one or more, or can be using other methods, constituent element, material etc..In other cases, it is not shown in detail or describes public affairs
Know structure, material or operation to avoid obscuring major technique intention of the invention.
Claims (11)
1. a kind of wind-driven generator, it is characterised in that including：
At least one set of stator modules (G1, G2, G3, G4), every group of stator modules (G1, G2, G3, G4) includes two symmetrical stators
Module (G1, G2, G3, G4)；
Electrified Transmission link (10), every group of stator modules (G1, G2, G3, G4) is connected with two Electrified Transmission links of parallel connection
(10), every Electrified Transmission link (10) includes current transformer group；
At least one transformation reactance module (11), each transformation reactance module (11) and Electrified Transmission link described at least one
(10) connect, the transformation reactance module (11) is configured with so that the circuit resonant frequencies of current transformer group in parallel are avoided
The reactance of the converter switches frequency in current transformer group.
2. wind-driven generator according to claim 1, it is characterised in that when the transformation reactance module (11) with it is in parallel
When two Electrified Transmission links (10) connect, the transformation reactance module (11) includes the double Split winding transformers of weak coupling
(12), and two Electrified Transmission links (10) in parallel two output ends respectively with the double division windings of the weak coupling
Two windings correspondence of transformer (12) low-pressure side is connected.
3. wind-driven generator according to claim 1, it is characterised in that when the transformation reactance module (11) and two electricity
When gas drive chain (10) is connected, the transformation reactance module (11) includes reactor group and three-winding transformer (14), and institute
Two output ends for stating two Electrified Transmission links (10) of parallel connection are respectively connected with a reactor group, two reactor groups it is defeated
Go out end connection corresponding with two windings of three-winding transformer (14) low-pressure side respectively.
4. wind-driven generator according to claim 1, it is characterised in that when the transformation reactance module (11) and N bars electricity
When gas drive chain (10) is connected, N is the even number more than 2, and the transformation reactance module (11) becomes including weak coupling N division windings
Depressor, and the N bars Electrified Transmission link (10) N number of output end respectively with weak coupling N Split winding transformer low-pressure sides
N number of winding correspondence connect.
5. wind-driven generator according to claim 1, it is characterised in that when the transformation reactance module (11) and N bars electricity
When gas drive chain (10) is connected, N is the even number more than 2, the transformation reactance module (11) including reactor group and (N+1) around
Group transformer, and N number of output end of N bar Electrified Transmission link (10) in parallel is respectively connected with a reactor group, N number of electricity
The connection corresponding with N number of winding of (N+1) winding transformer low-pressure side respectively of the output end of anti-device group.
6. wind-driven generator according to claim 1, it is characterised in that the current transformer group includes and the stator modules
The rectifier (A1, A2, A3, A4) of (G1, G2, G3, G4) connection and the inversion connected with the rectifier (A1, A2, A3, A4)
Device (B1, B2, B3, B4).
7. the wind-driven generator according to claim 1 or 6, it is characterised in that each stator modules (G1, G2, G3,
G4 the stator winding more than a set of or a set of) is included.
8. the wind-driven generator according to claim 1 or 6, it is characterised in that each stator modules (G1, G2, G3,
G4 two sets of stator winding) are included.
9. wind-driven generator according to claim 8, it is characterised in that phase is identical between two sets of stator winding,
Or phase differs 30 °, or phase differs 180 °.
10. wind-driven generator according to claim 8, it is characterised in that in one group of stator modules (G1, G2, G3, G4)
In one stator modules (G1, G2, G3, G4) in a set of stator winding and another stator modules (G1, G2, G3, G4) one
Set stator winding is connected with the current transformer group in an Electrified Transmission link (10), one group of stator modules (G1, G2, G3,
G4 another set of stator winding and described another stator modules in one stator modules (G1, G2, G3, G4) in)
Another set of stator winding in (G1, G2, G3, G4) is connected with the current transformer group in another Electrified Transmission link (10).
11. wind-driven generators according to claim 10, it is characterised in that be connected with same Electrified Transmission link (10)
Two sets of stator winding phase it is identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611270846.2A CN106787459B (en) | 2016-12-29 | 2016-12-29 | Wind power generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611270846.2A CN106787459B (en) | 2016-12-29 | 2016-12-29 | Wind power generator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860231A (en) * | 2010-05-20 | 2010-10-13 | 新疆全新环保新技术科技有限公司 | Special tri-level full-power converter set for large power wind-driven generator |
| US20110141773A1 (en) * | 2010-08-05 | 2011-06-16 | General Electric Company | Hvdc connection of wind turbine |
| CN102868180A (en) * | 2012-09-26 | 2013-01-09 | 浙江大学 | Wind power generation system based on open winding structure and fault tolerance control method thereof |
| CN104242341A (en) * | 2014-09-12 | 2014-12-24 | 周细文 | Direct-drive wind power conversion structure based on MMC and bipolar direct-current transmission structure |
-
2016
- 2016-12-29 CN CN201611270846.2A patent/CN106787459B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860231A (en) * | 2010-05-20 | 2010-10-13 | 新疆全新环保新技术科技有限公司 | Special tri-level full-power converter set for large power wind-driven generator |
| US20110141773A1 (en) * | 2010-08-05 | 2011-06-16 | General Electric Company | Hvdc connection of wind turbine |
| CN102868180A (en) * | 2012-09-26 | 2013-01-09 | 浙江大学 | Wind power generation system based on open winding structure and fault tolerance control method thereof |
| CN104242341A (en) * | 2014-09-12 | 2014-12-24 | 周细文 | Direct-drive wind power conversion structure based on MMC and bipolar direct-current transmission structure |
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