CN108512243A - Power transmission system, wind generating set and wind power plant - Google Patents
Power transmission system, wind generating set and wind power plant Download PDFInfo
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- CN108512243A CN108512243A CN201810428370.3A CN201810428370A CN108512243A CN 108512243 A CN108512243 A CN 108512243A CN 201810428370 A CN201810428370 A CN 201810428370A CN 108512243 A CN108512243 A CN 108512243A
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- 238000010248 power generation Methods 0.000 abstract description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a power transmission system, a wind generating set and a wind power plant, which are used for carrying out power transmission in a direct current mode, reducing the manufacturing cost of a power transmission line and the line loss in the power transmission process, improving the line utilization rate, increasing the power transmission distance and avoiding the skin effect existing in the line. The power transmission system is used for transmitting the electric energy generated by the wind generating set to a power grid, and comprises: the wind power generation system comprises a machine side rectification module, a network side inversion module, a grid-connected module and a power taking module, wherein the machine side rectification module is used for being connected with a wind generating set, the machine side rectification module, the network side inversion module and the grid-connected module are sequentially connected, and the grid-connected module is used for being connected with a power grid; the input end of the electricity taking module is connected with the grid side inversion module, and the output end of the electricity taking module is connected with the wind generating set.
Description
Technical field
The present invention relates to a kind of power electronics field more particularly to electron-transport system, wind power generating set and wind
Electric field.
Background technology
Electric energy needs caused by wind power generating set are connected to the grid and are transmitted, will be caused by wind power generating set
When electric energy is connected to the grid, traditional power transmission scheme is straight drive AC transmission system or double-fed AC transmission system.
As shown in Figure 1, showing the straight circuit topological structure for driving AC transmission system in Fig. 1.In wind power plant 10, each
690 volts of low-voltage AC is converted into 35 kilovolts by electric energy caused by direct driving motor after current transformer unsteady flow, by booster
(KV) middle pressure alternating current, and bus rod 11 is pressed in importing, the middle pressure alternating current of 35KV passes through liter in middle pressure bus rod 11
Depressor 12 is converted into the High Level AC Voltage of 110KV or the High Level AC Voltage of 220KV, finally by the High Level AC Voltage of 110KV or
The High Level AC Voltage of person 220KV is connected to the grid 13.In this scheme, since there are reactive powers in AC network, to carry
High transmitting capacity of the electric wire netting needs to install static reactive generator (Static Var Generator, SVG) 14 to carry out idle benefit
It repays.
As shown in Fig. 2, showing the circuit topological structure of double-fed AC transmission system in Fig. 2.In wind power plant 20, each
690 volts of low-voltage AC is converted into 35KV's by electric energy caused by double feedback electric engine after current transformer unsteady flow, by booster
Middle pressure alternating current, and bus rod 21 is pressed in importing, the middle pressure alternating current of 35KV passes through booster 22 in middle pressure bus rod 21
The High Level AC Voltage of the High Level AC Voltage of 110KV either 220KV is converted into finally by the High Level AC Voltage of 110KV or 220KV
High Level AC Voltage be connected to the grid 23.It is defeated to improve power grid since there are reactive powers in AC network in this scheme
Electric energy power, it is also desirable to install static reactive generator 24 to carry out reactive-load compensation.
From the foregoing, it will be observed that either directly drive AC transmission system or double-fed AC transmission system, by wind power plant apoplexy
When electric energy caused by power generator group is connected to the grid, it is transmitted in a manner of alternating current.Such mode not only circuit
Cost is high, less economical, transmission range is closer；And there is Kelvin effect in the line in transmission in alternating current, and circuit utilizes
Rate is low, loss is high；In addition, when being transmitted in a manner of alternating current, the variation of wind speed can cause the fluctuation of network voltage；Simultaneously
It needs to increase SVG progress reactive-load compensations in circuit system, increases system cost and loss.
Invention content
An embodiment of the present invention provides a kind of electrical power transmission system, wind power generating set and wind power plants, to use direct current
The form of electricity carries out power transmission, and the cost and the line loss during power transmission for reducing transmission line of electricity improve circuit profit
With rate, increase power transmission distance, while avoiding Kelvin effect present in circuit.
In a first aspect, the embodiment of the present invention provides a kind of electrical power transmission system, being used for will be caused by wind power generating set
Electric energy is transferred to power grid, and electrical power transmission system includes：Pusher side rectification module, net side inverter module, grid-connected module and take electric mould
Block, wherein pusher side rectification module is for connecting wind power generating set, pusher side rectification module, net side inverter module and grid-connected mould
Block is sequentially connected, and grid-connected module is for connecting power grid；
The input terminal of electricity-fetching module connects net side inverter module, and output end is for connecting wind power generating set.
In some embodiments of first aspect, electrical power transmission system further includes：Pusher side multiwinding transformer, pusher side mostly around
The primary side winding of group transformer for connect with the generator of wind power generating set, two pair sides of pusher side multiwinding transformer around
Group is connect with pusher side rectification module and electricity-fetching module respectively.
In some embodiments of first aspect, electricity-fetching module includes multiwinding transformer and multiple power cells, multiple
Cascade of power units connects, and the three-phase alternating current port of each power cell respectively with a vice-side winding of multiwinding transformer
Three-phase port be correspondingly connected with, the primary side winding of multiwinding transformer is connected with a vice-side winding of pusher side multiwinding transformer
It connects, multiple power cells are connected between two DC bus, and DC bus is connected to pusher side rectification module and net side inversion mould
Between block.
In some embodiments of first aspect, each power cell includes three-phase pulse width modulated (Pulse
Width Modulation, PWM) current transformer, three-phase PWM current transformer includes three inverter bridge legs being connected in parallel, and three
Three-phase port of the midpoint of inverter bridge leg respectively with a vice-side winding of multiwinding transformer is correspondingly connected with.
Further include being cut with what three-phase PWM current transformer was connected in parallel in power cell in some embodiments of first aspect
Involve and unloads energy component.
In some embodiments of first aspect, copped wave and unload can component include：It is connected between the busbar of power cell
Half-bridge bridge arm and one end is connected to half-bridge bridge arm midpoint and the other end is unloaded with what the positive electrode bus of power cell was connected
It can resistance.
In some embodiments of first aspect, pusher side rectification module includes three-phase rectifier, and three-phase rectifier includes six
A rectifying bridge arm, each rectifying bridge arm include multiple diodes being connected in series with, wherein each rectifying bridge arm includes more
The sum of reversed pressure voltage of a diode, and the difference of the voltage value of DC bus are more than predetermined voltage threshold, DC bus connection
Between pusher side rectification module and net side inverter module.
In some embodiments of first aspect, electrical power transmission system further includes：Dc circuit breaker is connected to pusher side rectification
Between module and net side inverter module, for carrying out short-circuit protection to electrical power transmission system；Or/also,
DC flat-wave reactor is connected between pusher side rectification module and net side inverter module, for pusher side rectification mould
The direct current of block output is filtered.
In some embodiments of first aspect, grid-connected module, including sequentially connected soft start switch circuit, switching group
Part and net side transformer.
In some embodiments of first aspect, net side inverter module includes modular multilevel (Modular
Multilevel Converter, MMC) converter valve.
Second aspect, the embodiment of the present invention provide a kind of wind power generating set, and wind power generating set includes that the present invention is implemented
The electrical power transmission system that example first aspect is provided.
The third aspect, the embodiment of the present invention provide a kind of wind power plant, and wind power plant includes multiple second party of the embodiment of the present invention
The wind power generating set that face is provided；Alternatively,
Wind power plant includes the electric power biography that multiple wind-driven generators, bus rod and first aspect of the embodiment of the present invention are provided
Defeated system, wherein
Bus rod is connected with each wind-driven generator；
Electrical power transmission system is connected with bus rod.
Electrical power transmission system, wind power generating set and wind power plant provided in an embodiment of the present invention, electrical power transmission system include：
Pusher side rectification module, net side inverter module, grid-connected module and electricity-fetching module, wherein pusher side rectification module is for connecting wind-force
Generating set, pusher side rectification module, net side inverter module and grid-connected module are sequentially connected, and grid-connected module is for connecting power grid；
The input terminal of electricity-fetching module connects net side inverter module, and output end is for connecting wind power generating set.
Electrical power transmission system provided in an embodiment of the present invention is connected net side inverter module with power grid by grid-connected module,
Electricity-fetching module is taken from net side inverter module electric to start wind power generating set, after wind power generating set starts, wind
Alternating current is converted to direct current by electric energy caused by power generator group by pusher side rectification module, and is passed in the form of direct current
Defeated to arrive net side, direct current is converted to alternating current, then alternating current is connected to the grid by grid-connected module by net side inverter module.On
Electric energy caused by wind power generating set is transferred to net side with direct current form from pusher side during stating, and uses in the prior art
Alternating current form, which is transmitted, to be compared, the cost and the line loss during power transmission that can reduce transmission line of electricity, is improved
Line efficiency increases power transmission distance, while avoiding Kelvin effect present in circuit.
Description of the drawings
From below in conjunction with the accompanying drawings to the present invention specific implementation mode description in may be better understood the present invention wherein,
Same or analogous reference numeral indicates same or analogous feature.
Fig. 1 is the structural schematic diagram for the circuit topology for directly driving AC transmission system in the prior art；
Fig. 2 is the structural schematic diagram of the circuit topology of double-fed AC transmission system in the prior art；
Fig. 3 is the structural schematic diagram of the circuit topology of electrical power transmission system provided in an embodiment of the present invention；For convenience of understanding,
Also show wind-driven generator；
Fig. 4 is the structural schematic diagram of the circuit topology of electricity-fetching module in electrical power transmission system provided in an embodiment of the present invention；
The structural schematic diagram of the circuit topology of power cell in Fig. 5 electricity-fetching modules provided in an embodiment of the present invention；
Fig. 6 is the structural representation of the circuit topology of pusher side rectification module in electrical power transmission system provided in an embodiment of the present invention
Figure；
Fig. 7 is the structural schematic diagram of the circuit topology of wind power plant provided in an embodiment of the present invention.
Specific implementation mode
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, in order 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 just for the sake of by showing that the example of the present invention is better understood from the present invention to provide.The present invention never limits
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 component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown
Art is unnecessary fuzzy to avoid causing the present invention.
It should be noted that the pusher side being previously mentioned in the embodiment of the present invention refers to wind power generating set side, for example, of the invention
The pusher side rectification module being previously mentioned in embodiment refers to the rectification module being arranged in wind power generating set side.In the embodiment of the present invention
The net side being previously mentioned refers to grid side, for example, the net side inverter module being previously mentioned in the embodiment of the present invention refers to being arranged in power grid
The inverter module of side.
With reference to Fig. 3~Fig. 7 to electrical power transmission system provided in an embodiment of the present invention, wind power generating set and wind power plant
It is described in detail.
As shown in figure 3, electrical power transmission system provided in an embodiment of the present invention, is used for wind-power electricity generation in wind power generating set
Electric energy caused by machine 30 is transmitted to power grid 31, and electrical power transmission system includes：Pusher side rectification module 32, net side inverter module 33,
Grid-connected module 34 and electricity-fetching module 35, wherein pusher side rectification module 32 is for connecting wind power generating set, pusher side rectification mould
Block 32, net side inverter module 33 and grid-connected module 34 are sequentially connected, and grid-connected module 34 is for connecting power grid；Electricity-fetching module 35
Input terminal connects net side inverter module 33, and output end is for connecting wind power generating set.
Wherein, electricity-fetching module 35 take electricity to start the wind-driven generator in wind power generating set from net side inverter module 33
30, electric energy caused by wind-driven generator 30 is through pusher side rectification module 32, net side inverter module 33 and simultaneously in wind power generating set
Net module 34 is transmitted to power grid 31.
When it is implemented, pusher side rectification module 32 and electricity-fetching module 35 can pass through multiwinding transformer and wind-driven generator
The wind-driven generator 30 of group connects.Specifically, electrical power transmission system further includes：Pusher side multiwinding transformer 36, pusher side mostly around
The primary side winding of group transformer 36 is used to connect with the wind-driven generator 30 of wind power generating set, pusher side multiwinding transformer 36
Two vice-side windings are connect with pusher side rectification module 32 and electricity-fetching module 35 respectively.
In one embodiment, electrical power transmission system further includes：Dc circuit breaker 37 is connected to pusher side rectification module 32
Between net side inverter module 33, for carrying out short-circuit protection to electrical power transmission system.
In one embodiment, electrical power transmission system further includes：DC flat-wave reactor 38 is connected to pusher side rectification mould
Between block 32 and net side inverter module 33, the direct current for being exported to pusher side rectification module 32 is filtered.
In one embodiment, net side inverter module 33 includes MMC converter valves.
In one embodiment, grid-connected module 34, including sequentially connected soft start switch circuit 341, switch module
342 and net side transformer 343.Wherein, medium voltage breaker may be used in switch module 342.
In practical application, when starting wind power generating set, the switch module 342 being closed in grid-connected module 34, at this point, power grid
31 pass through 343 direction wind-driven generator group power transmission of net side transformer.
Specifically, since switch module 342 is closed, net side inverter module 33 is connect with power grid 31, the friendship in power grid 31
Galvanic electricity by the soft charging resistor opened in switching circuit 341 to the busbar charging of net side inverter module 33 (or MMC converter valves),
When charging is complete, the switch module in soft start switch circuit 341 is attracted, and disconnects the electricity that charges in soft start switch circuit 341
The AC charging circuit of resistance.
The electric energy stored in 33 busbar of net side inverter module passes through DC flat-wave reactor 38 and dc circuit breaker 37, Xiang Zhi
It flows busbar and conveys direct current, wherein DC bus refers to the connecting line between pusher side rectification module 32 and net side inverter module 33.
Electricity-fetching module 35 takes electricity from DC bus, and the electric energy of acquisition is reverse into alternating current, is become by pusher side Multiple coil
Depressor 36 takes electric winding, 30 power transmission of wind-driven generator in direction wind-driven generator group, meets wind-driven generator 30 and starts work
Demand, start wind power generating set in wind-driven generator 30.
After wind-driven generator 30 in wind power generating set starts work, 690V caused by wind-driven generator 30 is exchanged
Electricity, the boosted alternating current for being converted to 35KV, the alternating current for the 35KV that wind-driven generator 30 generates pass through pusher side Multiple coil transformation
The alternating current of 35KV is supplied to pusher side rectification module 32 by the power winding of device 36.
The alternating current of 35KV is converted to direct current by pusher side rectification module 32, and passes sequentially through dc circuit breaker 37, direct current
Smoothing reactor 38 is by DC power transmission to net side inverter module 33.Net side inverter module 33 is by DC inverter at the friendship of 35KV
Galvanic electricity, and the alternating current of 35KV is converted to by net side transformer 343 alternating current of 220KV, it is then incorporated into power grid 31, is realized
Electric energy caused by wind-driven generator in wind power generating set 30 is transmitted to power grid 31.
During wind-driven generator 30 in above-mentioned startup wind power generating set, electricity-fetching module 35 is needed from direct current mother
Line takes electricity, and the electric energy of acquisition is reverse into alternating current, passes through the electric winding that takes of pusher side multiwinding transformer 36, wind power generation
30 power transmission of wind-driven generator in unit.
In one embodiment, as shown in figure 4, the circuit topological structure of electricity-fetching module 35, may include：Multiple coil becomes
Depressor 351 and multiple power cells 352.Wherein, 352 cascade Connection of multiple power cells, and the three-phase of each power cell 352
Three-phase port of the AC port respectively with a vice-side winding of multiwinding transformer 351 is correspondingly connected with, multiwinding transformer 351
Primary side winding be connected with a vice-side winding of pusher side multiwinding transformer 36, multiple power cells 352 are connected to two
Between DC bus.
In one example, multiple power cells include M power cell, and each power cell 352 includes three electrical
Port, respectively direct-flow positive pole port, direct current cathode port and three-phase alternating current port.In the multiple power cells of cascade Connection
When 352, the direct-flow positive pole port of first power cell 352 connects DC bus DC+, the direct current of first power cell 352
Cathode port connects the direct-flow positive pole port of second power cell 352；And so on, the direct current of m-th power cell 352
Positive port, connects the direct current cathode port of the M-1 power cell 352, and the direct current negative terminal mouth of m-th power cell 352 connects
Meet DC bus DC-.
The three-phase alternating current port of first power cell 352 respectively with multiwinding transformer 351 it is secondary while first it is secondary while around
The three-phase port of group is correspondingly connected with；Successively, the three-phase alternating current port of m-th power cell 352 respectively with multiwinding transformer
The three-phase port of the m-th vice-side winding on 351 secondary sides is correspondingly connected with；The primary side winding of multiwinding transformer 351, connection pusher side are more
One vice-side winding of winding transformer 36.Wherein, M is the positive integer more than 1.
In one embodiment, as shown in figure 5, the circuit topological structure of power cell 352, may include：Three-phase arteries and veins
Width modulated PWM converter 3520 is rushed, three-phase PWM current transformer 3520 includes three inverter bridge legs being connected in parallel, and three inverse
Become three-phase alternating current port of the midpoint as power cell 352 of bridge arm, respectively with a vice-side winding of multiwinding transformer
Three-phase port is correspondingly connected with.
The three-phase PWM current transformer 3520 that power cell 352 includes, can be the direct current in 352 busbar of power cell
It is reverse into three-phase alternating current, is mapped with the three-phase port of 351 vice-side winding of corresponding multiwinding transformer, it can also be more
Three-phase alternating current in 351 vice-side winding of winding transformer is rectified into direct current, realizes the two-way flow of energy.
In one embodiment, in power cell 352 further include the copped wave being connected in parallel with three-phase PWM current transformer 3520
And unload energy component 3521.As shown in figure 5, copped wave and unload can component 3521 include：It is connected between the busbar of power cell 352
Half-bridge bridge arm and one end are connected to half-bridge bridge arm midpoint and the other end is unloaded with what the positive electrode bus of power cell 352 was connected
It can resistance.
Energy and clipper component 3521 are unloaded, can be configured as in DC bus-bar voltage is more than preset DC bus-bar voltage threshold
When value, by unload can and clipper component 3521 in unload can resistance, discharge be more than DC bus-bar voltage threshold value energy.Wherein,
Preset DC bus-bar voltage threshold value can freely be set based on experience value.
It should be noted that the half-bridge bridge arm being previously mentioned in the embodiment of the present invention includes that two insulated gates being connected in series with are double
Bipolar transistor (Insulated Gate Bipolar Transistor, IGBT).
In one embodiment, each IGBT that half-bridge bridge arm includes can also be connected with anti-paralleled diode.
In one embodiment, in power cell 352 further include the busbar being connected in parallel with three-phase PWM current transformer 3520
Capacitance 3522 and discharge resistance 3523.Wherein, bus capacitor 3522 is for realizing the storage of energy, and discharge resistance 3523 is for real
Residual electricity energy releases after existing wind power generating set is shut down.
When electric energy caused by wind-driven generator in wind power generating set 30 is transferred to power grid 31, pusher side rectification module
32 by the alternating current of 35KV for being converted to direct current.Pusher side rectification module 32 may include three-phase rectifier.
As shown in fig. 6, three-phase rectifier includes six rectifying bridge arms 321, each rectifying bridge arm includes that multiple series connection connect
The diode connect, wherein the sum of the reversed pressure voltage of multiple diodes that each rectifying bridge arm includes, the electricity with DC bus
The difference of pressure value is more than predetermined voltage threshold.Wherein, predetermined voltage threshold can freely be set based on experience value, for example, default electricity
Pressure threshold value is 4500V.
Based on identical inventive concept, the embodiment of the present invention additionally provides a kind of wind power generating set, wind power generating set
It include the electrical power transmission system that the above embodiment of the present invention is provided.
Wind power generating set provided in an embodiment of the present invention, since wind power generating set includes that the embodiment of the present invention provides
Electrical power transmission system so that in wind power generating set electric energy caused by generator can with direct current form from pusher side transmit
To net side, the line loss during cost and power transmission to reduce transmission line of electricity improves line efficiency, increases electricity
Power transmission range, while avoiding Kelvin effect present in circuit.
Based on identical inventive concept, the embodiment of the present invention additionally provides a kind of wind power plant, and wind power plant includes multiple hairs
The wind power generating set that bright above-described embodiment is provided.
In wind power plant provided in an embodiment of the present invention, provided including the embodiment of the present invention in each wind power generating set
Electrical power transmission system so that electric energy can be with direct current form slave caused by each wind power generating set in wind power plant
Side is transferred to net side, the line loss during cost and power transmission to reduce transmission line of electricity, improves line efficiency,
Increase power transmission distance, while avoiding Kelvin effect present in circuit.
In addition, the embodiment of the present invention additionally provides another wind power plant, as shown in fig. 7, wind power plant includes multiple wind-force hairs
The electrical power transmission system 300 that generation array 39, bus rod 40 and the above embodiment of the present invention of motor form are provided,
In, bus rod 40 is connected with each wind-driven generator；Electrical power transmission system 300 is connected with bus rod 40.
Wherein, wind-driven generator can be the straight wind-driven generator for driving AC system, can also be the wind-force of double-fed AC system
Generator, it is not limited in the embodiment of the present invention.
In wind power plant provided in an embodiment of the present invention, the electric power that is provided using the above embodiment of the present invention in wind power plant
Transmission system so that electric energy caused by each wind-driven generator can be transferred to direct current form from pusher side in wind power plant
Net side, the line loss during cost and power transmission to reduce transmission line of electricity improve line efficiency, increase electric power
Transmission range, while avoiding Kelvin effect present in circuit.Meanwhile multiple wind-force are converged using bus rod in wind power plant
Electric energy caused by generator carries out concentration of transmissions, effectively save cost after convergence.
It should be clear that each embodiment in this specification is described in a progressive manner, each embodiment it
Between just to refer each other for same or analogous part, the highlights of each of the examples are it is different from other embodiment it
Place.For device embodiments, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
Apply be variously modified after the spirit of example, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
It needs to define, the embodiment of the present invention is not limited to specific configuration described above and shown in figure and place
Reason.And the detailed description to known method technology for brevity, is omitted here.In the above-described embodiments, it describes and shows
Several specific steps are gone out as example.But the procedure of the embodiment of the present invention be not limited to it is described and illustrated
Specific steps, those skilled in the art can understand the embodiment of the present invention spirit after be variously modified, change and
Addition, or the sequence between changing the step.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, application-specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute the program of required task
Or code segment.Either code segment can be stored in machine readable media program or the data by being carried in carrier wave are believed
It number is sent in transmission medium or communication links." machine readable media " may include be capable of storage or transmission information any
Medium.The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM
(EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can via such as because
The computer network of special net, Intranet etc. is downloaded.
Those skilled in the art will be understood that above-described embodiment is illustrative and not restrictive.In different embodiments
The different technologies feature of middle appearance can be combined, to obtain advantageous effect.Those skilled in the art are in research attached drawing, explanation
On the basis of book and claims, the embodiment of other variations of revealed embodiment is will be understood that and realized.In right
In claim, term " comprising " is not precluded from other devices or steps；Indefinite article "one" be not excluded for it is multiple；Term " the
One ", " second " is for indicating title not for any specific sequence of expression.Any reference numeral in claim is not
It should be understood limiting of its scope.The function of the multiple portions occurred in claim can be by an individual hardware
Or software module is realized.Certain technical characteristic appearance are not meant in different dependent claims cannot be by these skills
Art feature is combined to obtain advantageous effect.
Claims (11)
1. a kind of electrical power transmission system, for electric energy caused by wind power generating set to be transferred to power grid, which is characterized in that institute
Stating electrical power transmission system includes：Pusher side rectification module, net side inverter module, grid-connected module and electricity-fetching module, wherein described
Pusher side rectification module for connecting wind power generating set, the pusher side rectification module, net side inverter module and grid-connected module according to
Secondary connection, the grid-connected module is for connecting power grid；
The electricity-fetching module, for taking electricity to start the wind power generating set from the net side inverter module.
2. system according to claim 1, which is characterized in that the electrical power transmission system further includes：Pusher side Multiple coil becomes
Depressor, the primary side winding of the pusher side multiwinding transformer with the generator of the wind power generating set for connecting, the machine
Two vice-side windings of side multiwinding transformer are connect with the pusher side rectification module and the electricity-fetching module respectively.
3. system according to claim 1, which is characterized in that the electricity-fetching module includes multiwinding transformer and multiple work(
Rate unit, the connection of the multiple cascade of power units, and the three-phase alternating current port of each power cell respectively with the Multiple coil
The three-phase port of one vice-side winding of transformer is correspondingly connected with, and the primary side winding of the multiwinding transformer and the pusher side are more
One vice-side winding of winding transformer is connected, and the multiple power cell is connected between two DC bus, described straight
Stream busbar is connected between the pusher side rectification module and the net side inverter module.
4. system according to claim 3, which is characterized in that each power cell includes three-phase pulse width modulated
PWM converter, the three-phase PWM current transformer include three inverter bridge legs being connected in parallel, and three inverter bridge legs
Three-phase port of the midpoint respectively with a vice-side winding of the multiwinding transformer is correspondingly connected with.
5. system according to claim 4, which is characterized in that further include becoming with the three-phase PWM in the power cell
The copped wave and unload energy component that stream device is connected in parallel.
6. system according to claim 5, which is characterized in that the copped wave and unload can component include：It is connected to the work(
Half-bridge bridge arm and one end between the busbar of rate unit are connected to half-bridge bridge arm midpoint and the other end and the power
What the positive electrode bus of unit was connected unloads energy resistance.
7. according to the system described in any one of claim 1-6, which is characterized in that the pusher side rectification module includes that three-phase is whole
Device is flowed, the three-phase rectifier includes six rectifying bridge arms, and each rectifying bridge arm includes multiple diodes being connected in series with,
In, the sum of the reversed pressure voltage of multiple diodes that each rectifying bridge arm includes, and the difference of the voltage value of DC bus are more than
Predetermined voltage threshold, the DC bus are connected between the pusher side rectification module and the net side inverter module.
8. according to the system described in any one of claim 1-6, which is characterized in that the electrical power transmission system further includes：Directly
Breaker is flowed, is connected between the pusher side rectification module and the net side inverter module, for the electrical power transmission system
Carry out short-circuit protection；Or/also,
DC flat-wave reactor is connected between the pusher side rectification module and the net side inverter module, for the machine
The direct current of side rectification module output is filtered.
9. according to the system described in any one of claim 1-6, which is characterized in that the net side inverter module includes modularization
More level MMC converter valves.
10. a kind of wind power generating set, which is characterized in that the wind power generating set includes such as any one of claim 1-9
The electrical power transmission system.
11. a kind of wind power plant, which is characterized in that the wind power plant includes multiple wind-driven generators as claimed in claim 10
Group；Alternatively,
The wind power plant includes that multiple wind-driven generators, bus rod and electric power as claimed in any one of claims 1-9 wherein pass
Defeated system, wherein
The bus rod is connected with each wind-driven generator；
The electrical power transmission system is connected with the bus rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810428370.3A CN108512243A (en) | 2018-05-07 | 2018-05-07 | Power transmission system, wind generating set and wind power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810428370.3A CN108512243A (en) | 2018-05-07 | 2018-05-07 | Power transmission system, wind generating set and wind power plant |
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| CN201810428370.3A Pending CN108512243A (en) | 2018-05-07 | 2018-05-07 | Power transmission system, wind generating set and wind power plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378985A (en) * | 2018-11-22 | 2019-02-22 | 北京金风科创风电设备有限公司 | Alternating current-direct current conversion device, wind generating set and wind power plant system |
| CN110350506A (en) * | 2019-07-23 | 2019-10-18 | 上海交通大学 | Direct current Wind turbines, middle straightening stream direct grid-connected system and Control and protection system |
| WO2020094031A1 (en) * | 2018-11-07 | 2020-05-14 | 南京南瑞继保电气有限公司 | Inverter and control method therefor, sub-module, and energy-consumping circuit |
| CN111336066A (en) * | 2020-03-04 | 2020-06-26 | 湖南城市学院 | Wind power generation system for generating energy and control method |
| CN113258801A (en) * | 2020-02-12 | 2021-08-13 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386633A (en) * | 2011-11-07 | 2012-03-21 | 荣信电力电子股份有限公司 | Megawatt direct-drive alternating current-direct current-alternating current wind power generating system with squirrel-cage asynchronous generator |
| 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 |
| CN104753082A (en) * | 2015-03-12 | 2015-07-01 | 华南理工大学 | Flexible high voltage direct current transmission converter topology used for wind power plant grid connection |
| CN204720981U (en) * | 2015-06-25 | 2015-10-21 | 深圳市禾望电气股份有限公司 | A kind of three phase network disturbing generating device |
| CN106451532A (en) * | 2016-09-09 | 2017-02-22 | 湖南大学 | Multi-phase direct-drive permanent-magnet wind power generation variable current integrated system and control method thereof |
| CN107887924A (en) * | 2017-12-20 | 2018-04-06 | 北京金风科创风电设备有限公司 | Fan power transmission system |
| CN107895962A (en) * | 2017-11-23 | 2018-04-10 | 东南大学 | A kind of current source type HVDC transmission system and its operation method |
| CN107947222A (en) * | 2017-12-26 | 2018-04-20 | 北京金风科创风电设备有限公司 | Direct current fan power transmission system |
| CN208112245U (en) * | 2018-05-07 | 2018-11-16 | 北京金风科创风电设备有限公司 | Electrical power transmission system, wind power generating set and wind power plant |
-
2018
- 2018-05-07 CN CN201810428370.3A patent/CN108512243A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386633A (en) * | 2011-11-07 | 2012-03-21 | 荣信电力电子股份有限公司 | Megawatt direct-drive alternating current-direct current-alternating current wind power generating system with squirrel-cage asynchronous generator |
| 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 |
| CN104753082A (en) * | 2015-03-12 | 2015-07-01 | 华南理工大学 | Flexible high voltage direct current transmission converter topology used for wind power plant grid connection |
| CN204720981U (en) * | 2015-06-25 | 2015-10-21 | 深圳市禾望电气股份有限公司 | A kind of three phase network disturbing generating device |
| CN106451532A (en) * | 2016-09-09 | 2017-02-22 | 湖南大学 | Multi-phase direct-drive permanent-magnet wind power generation variable current integrated system and control method thereof |
| CN107895962A (en) * | 2017-11-23 | 2018-04-10 | 东南大学 | A kind of current source type HVDC transmission system and its operation method |
| CN107887924A (en) * | 2017-12-20 | 2018-04-06 | 北京金风科创风电设备有限公司 | Fan power transmission system |
| CN107947222A (en) * | 2017-12-26 | 2018-04-20 | 北京金风科创风电设备有限公司 | Direct current fan power transmission system |
| CN208112245U (en) * | 2018-05-07 | 2018-11-16 | 北京金风科创风电设备有限公司 | Electrical power transmission system, wind power generating set and wind power plant |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020094031A1 (en) * | 2018-11-07 | 2020-05-14 | 南京南瑞继保电气有限公司 | Inverter and control method therefor, sub-module, and energy-consumping circuit |
| CN109378985A (en) * | 2018-11-22 | 2019-02-22 | 北京金风科创风电设备有限公司 | Alternating current-direct current conversion device, wind generating set and wind power plant system |
| CN110350506A (en) * | 2019-07-23 | 2019-10-18 | 上海交通大学 | Direct current Wind turbines, middle straightening stream direct grid-connected system and Control and protection system |
| CN110350506B (en) * | 2019-07-23 | 2020-11-20 | 上海交通大学 | Direct-current wind turbine generator, medium-voltage direct-current direct grid-connected system and control and protection system |
| CN113258801A (en) * | 2020-02-12 | 2021-08-13 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
| CN111336066A (en) * | 2020-03-04 | 2020-06-26 | 湖南城市学院 | Wind power generation system for generating energy and control method |
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