CN108631355A - Converter, electric control system and wind farm power transmission system - Google Patents
Converter, electric control system and wind farm power transmission system Download PDFInfo
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- CN108631355A CN108631355A CN201711432843.9A CN201711432843A CN108631355A CN 108631355 A CN108631355 A CN 108631355A CN 201711432843 A CN201711432843 A CN 201711432843A CN 108631355 A CN108631355 A CN 108631355A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 238000004804 winding Methods 0.000 claims description 26
- 230000005611 electricity Effects 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 11
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
-
- 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
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a converter, an electric control system and a wind farm power transmission system. The converter comprises three cascaded power strings; each cascade power string comprises a first output terminal and a second output terminal, star point connection is formed between the first output terminals of each cascade power string, and the second output terminal of each cascade power string forms three-phase output; and the three-phase input of each cascade power string is connected with a direct-drive wind driven generator of the wind driven generator set. According to the converter provided by the embodiment of the invention, the output voltage of the converter can be increased, the output current is reduced, the loss of the whole system is reduced, the use of a large number of low-voltage cables can be reduced, and the cable release pressure of a fan system is relieved.
Description
Technical field
The present invention relates to wind-electricity integration technical field more particularly to a kind of current transformer, electricity for wind power plant transmission system
Control system and wind power plant transmission system.
Background technology
With the aggravation of energy crisis, the development and utilization of new energy has become the hot spot of research, and wind-powered electricity generation is that have at present
The regenerative resource of large-scale development potential.Wind power generating set is to convert wind energy into mechanical energy, and mechanical energy drives generator
Rotor rotates, the power equipment of final output alternating current.Since concentration is compared in wind-resources distribution in China's, Wind Power Generation uses greatly
Scale, pattern high concentration access and transmitted at a distance.In order to ensure wind power generating set output low frequency ac electricity
Stability is pressed, the low-frequency ac electric energy that wind power generating set exports usually is transformed into direct current energy by rectification, using inverse
Become circuit and direct current energy is transformed into electric main, just can guarantee stable use.
In current wind power generating set transmission system, usually using current transformer realize the transmission of above-mentioned electric energy with it is transformed
Journey.When practical application, the generator of wind power generating set is located at the cabin of tower top, and current transformer is normally at wind power generating set
In the tower of bottom of tower, a large amount of low-voltage cable needs the current transformer that bottom of tower is transferred to by high tower, this to use in tower
Number of cables it is more, prodigious pressure is caused to untying the mooring rope for blower fan system.
In addition, the voltage of current transformer output is relatively low, and output current is larger, needs the low-voltage cable of a large amount of noble metal
It uses, causes the loss of machine system larger.
Invention content
The embodiment of the present invention provides a kind of current transformer, electric-control system and wind power plant transmission of electricity system for wind power plant transmission system
System can increase the output voltage of current transformer, reduce output current, reduce the loss of machine system, and can reduce a large amount of low
The pressure of untying the mooring rope of blower fan system is alleviated in the use of voltage cable.
One side according to the ... of the embodiment of the present invention provides a kind of current transformer for wind power plant transmission system, including three
Concatenated power string；Wherein, each concatenated power string includes that first lead-out terminal and second output terminal are sub, each concatenated power string
Asterism connection is formed between first lead-out terminal, second output terminal of each concatenated power string forms three-phase output；Each grade
The direct wind-driven generator of the three-phase input and wind power generating set that join power string connects.
Another aspect according to the ... of the embodiment of the present invention provides a kind of electric-control system for wind power plant transmission system, including
Current transformer in direct wind-driven generator and above-described embodiment；Direct wind-driven generator is configured as including multiple windings, multiple
The quantity of winding is 3N, and every three windings form one group of three-phase windings, wherein N is the integer more than or equal to 3；Current transformer,
It is configured as connecting with direct wind-driven generator by multiple windings.
It is according to the ... of the embodiment of the present invention in another aspect, provide a kind of wind power plant transmission system, including above-described embodiment description
Electric-control system, multigroup duplex frequency boostering transformer and medium-pressure electricity supply busbar；Wherein, the low-pressure side of every group of duplex frequency boostering transformer with
One group of electric-control system connection in multigroup electric-control system, every group of duplex frequency boostering transformer pass through inductance and medium-pressure electricity supply busbar three-phase
Connection；Multigroup duplex frequency boostering transformer is configured for the industrial-frequency alternating current for meeting grid requirements for exporting multigroup electric-control system
It can be converted into meeting the middle pressure AC energy of grid requirements, and the middle pressure AC energy being converted to access medium-pressure electricity supply is female
Line.
Current transformer, electric-control system and wind power plant transmission system according to embodiments of the present invention, can pass through modular stages
The mode of connection increases the output voltage of current transformer by the concatenated power string in current transformer, reduces output current, reduces big
The use of batch low-voltage cable reduces the loss of machine system.Meanwhile the current transformer in the embodiment of the present invention can be to avoid current
Low-voltage high-capacity current transformer must carry out the selection of hoist capacity in parallel, so as to avoid skills such as the stream of shunt cable and circulation
Art problem improves the reliability of blower fan system.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
It can be obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure for showing the current transformer currently used for wind power generating set and the schematic diagram of position；
Fig. 2 is the topological structure schematic diagram for the electric-control system for showing the current transformer currently based on wind power generating set；
Fig. 3 is the structural schematic diagram for the current transformer for showing to be provided according to one embodiment of the invention；
Fig. 4 is the detailed construction schematic diagram for showing the current transformer according to some exemplary embodiments of the invention；
Fig. 5 is the concrete structure schematic diagram for showing power cell according to an embodiment of the invention；
Fig. 6 is the structural schematic diagram for the electric-control system for showing to be provided according to one embodiment of the invention；
Fig. 7 is the structural schematic diagram for showing wind power plant transmission system according to an embodiment of the invention.
In the accompanying drawings, identical component uses identical reference numeral, description of symbols as follows：
10- wind power generating sets；20- electric-control systems；21- direct driving motors；The first current transformers of 2201-；The second unsteady flows of 2202-
Device；
200- direct wind-driven generators；300- current transformers；310- the first concatenated power strings；320- the second concatenated power strings；
330- third concatenated power strings；
3111- three-phase converter modules；3112- bus capacitors and discharge resistance module；3113- chopper circuit modules；
3114-H formula leg inverter modules；
600- electric-control systems；610- variable blade control systems；620- master control systems；
700- wind power plant transmission systems；The multigroup duplex frequency boostering transformers of 710-；720- medium-pressure electricity supply busbares；730- boostings are defeated
Piezoelectric transformer；740- AC energy incoming transports transmission of electricity busbar；750- reactive power compensators.
Specific implementation mode
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make the mesh of the present invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case of some details in not needing these details
It applies.Below to the description of embodiment just for the sake of by showing that the example of the present invention is better understood from the present invention to provide.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
Fig. 1 is the structure for showing the current transformer currently used for wind power generating set and the schematic diagram of position.As shown in Figure 1,
The generator of wind power generating set is usually located at the cabin of tower top, and current transformer is normally at the tower of the bottom of tower of wind power generating set
Interior, a large amount of low-voltage cable is transferred to the current transformer of bottom of tower, the low frequency that current transformer exports wind power generating set by high tower
Alternating current is transformed into direct current energy by rectification, then direct current energy is changed into AC energy via inverter circuit and accesses power grid.
But the setting of the position of the current transformer makes the number of cables used in tower more, the pressure of untying the mooring rope of blower fan system
It is very big.
Fig. 2 is the topological structure schematic diagram for the electric-control system for showing the current transformer currently based on wind power generating set.Such as Fig. 2
Shown, electric-control system 20 includes that direct driving motor 21, the first current transformer 2201 and the second current transformer 2202, direct driving motor 21 are connected to
Wind power generating set 10.As seen from Figure 2, traditional current transformer can be direct by the first current transformer 2201 or current transformer 2202
As converter system.For example, the first current transformer 2201 wind-power electricity generation pusher side three-phase by inductance, connection direct driving motor is fixed
The three-phase windings of son；The first current transformer 2201 grid side three-phase by inductance, access other electrical equipments in power grid
Such as step-up transformer (not shown).
But the current transformer output voltage is relatively low, electric current is larger, needs the use of the low-voltage cable of a large amount of noble metal,
Cause the loss of machine system larger.
Increasing with the capacity of wind power generating set, low pressure current transformer needs to expand capacity by parallel.Such as Fig. 2 institutes
Show, current transformer can form current transformer parallel system by the first current transformer 2201 and the second current transformer 2202, the current transformer simultaneously
The wind-power electricity generation pusher side of system is contacted, the three-phase of each current transformer connects the three-phase windings of direct driving motor stator by inductance；At this
The grid side of current transformer parallel system, the AC output parallel connection of each current transformer connect other electrical equipments in power grid and for example rise
The low-pressure side of pressure transformer.
However, the current transformer parallel system that low pressure current transformer parallel connection obtains easily causes serious circulation problem, circulation problem
It can cause the equal properties of flow of the low pressure current transformer parallel system output current that ideal effect is not achieved, to the reliable of blower fan system
Property impacts.
For these reasons, it an embodiment of the present invention provides a kind of current transformer for wind power plant transmission system, changes
The internal electrical structure of current transformer can increase the output voltage of current transformer, reduce output current, reduce the damage of machine system
Consumption, and the use of a large amount of low-voltage cables can be reduced, alleviate the pressure of untying the mooring rope of blower fan system, improves the reliability of blower fan system.
In order to better understand the present invention, below in conjunction with attached drawing, be described in detail current transformer according to the ... of the embodiment of the present invention,
Electric-control system and wind power plant transmission system, it should be noted that these embodiments are not for limiting the scope of the present disclosure.
Fig. 3 shows the structural schematic diagram of the current transformer provided according to one embodiment of the invention.As shown in figure 3, current transformer
300 can specifically include three concatenated power strings, wherein each concatenated power string may include that first lead-out terminal and second are defeated
Go out terminal, forms asterism connection, the second output of each concatenated power string between the first lead-out terminal of each concatenated power string
Terminal forms the three-phase output of current transformer 300；The directly-driven wind of the three-phase input and wind power generating set of each concatenated power string
Generator connects.
In this embodiment, which is configured as the alternating current for exporting direct wind-driven generator conversion
At the industrial frequency AC electric energy for meeting grid requirements.
As an example, as shown in figure 3, current transformer 300 may include the first concatenated power string 310, second cascade work(
Rate string 320 and third concatenated power string 330.
With continued reference to Fig. 3, the first lead-out terminal of the first concatenated power string 310, the second concatenated power string 320 it is first defeated
Formation asterism connects between going out the first lead-out terminal of terminal and third concatenated power string 330；First concatenated power string 310
Second output terminal, the second concatenated power string 320 second output terminal and third concatenated power string 330 it is second defeated
Go out terminal and forms three-phase output.
The current transformer of the embodiment of the present invention is respectively by the first concatenated power string 310, the second concatenated power string 320, Yi Ji
Three concatenated power strings 330 constitute three-phase system together.Unsteady flow can be directly constituted by changing single current transformer in conventional current transformer
The design of system increases the output voltage of current transformer by the cascade mode of modularization, greatly reduces output current, reduces
The use of high-volume low-voltage cable, reduces loss, improves efficiency；Meanwhile avoiding current low-voltage high-capacity current transformer
The selection that must carry out hoist capacity in parallel avoids the technical problems such as stream and circulation, improves the reliability of blower fan system.
Fig. 4 shows the detailed construction schematic diagram of the current transformer according to some exemplary embodiments of the invention, Fig. 4 and Fig. 3
Identical or equivalent structure uses identical label.As shown in figure 4, current transformer 300 includes the first concatenated power string 310, second
Concatenated power string 320 and third concatenated power string 330, wherein the first concatenated power string 310 includes multiple power cell examples
As power cell _ a1, power cell _ a2 ..., power cell _ aN；Second concatenated power string 320 includes multiple power cells
Such as power cell _ b1, power cell _ b2 ..., power cell _ bN；Third concatenated power string 330 includes multiple power lists
Member such as power cell _ c1, power cell _ c2 ..., power cell _ cN.But the invention is not limited in described above,
And the specific module being shown in FIG. 4, in some embodiments, the concatenated power string in current transformer 300 can include more
Flexible configuration, illustrates with reference to specific embodiment.
In one embodiment, each concatenated power string of current transformer 300 includes multiple power cells, wherein multiple
The three-phase input of each power cell in power cell connects with one group of three-phase windings of direct wind-driven generator correspondingly
It connects；It is connected in series between multiple power cells of each concatenated power string；Each power cell includes the first AC output terminal
With the second AC output terminal, in each concatenated power string in two neighboring power cell a upper power cell the second exchange
Terminal is connect with the first ac terminal of next power cell, first power list of the serial connection of each concatenated power string
First lead-out terminal of first ac terminal of member as each concatenated power string, the serial connection of each concatenated power string is most
Second output terminal of second ac terminal of the latter power cell as each concatenated power string.
That is, for the multiple power cells being connected in series in each concatenated power string, it can will remove and be connected in series with
First power cell and the last one power cell for being connected in series with other than each power cell the first ac terminal
Connect with the second ac terminal of a upper power cell of its serial connection, and by its second ac terminal with and its serially
The first ac terminal connection of next power cell of connection.
As an example, when each concatenated power string of current transformer 300 includes three power cells, i.e. concatenated power
The power cell that the first concatenated power string 310 in string includes be power cell _ a1, power cell _ a2 and power cell _ a3,
The power cell that second concatenated power string 320 includes is power cell _ b1, power cell _ b2 and power cell _ b3, Yi Ji
The power cell that three concatenated power strings 330 include is power cell _ c1, power cell _ c2 and power cell _ c3.
In this example, the three-phase input of power cell _ a1, the three-phase input of power cell _ a2, power cell _ a3
Three-phase input, the three-phase input of power cell _ b1, the three-phase input of power cell _ b2, the three-phase input of power cell _ b3, work(
The three-phase input of rate unit _ c1, the three-phase input of power cell _ c2 and the three-phase input of power cell _ c3 are driven respectively at straight
One group of three-phase windings of wind-driven generator connect；
In the first concatenated power string 310, serially connect between power cell _ a1, power cell _ a2 and power cell _ a3
It connects, in the second concatenated power string 320, is connected in series between power cell _ b1, power cell _ b2 and power cell _ b3,
In third concatenated power string 330, it is connected in series between power cell _ c1, power cell _ c2 and power cell _ c3.
First lead-out terminal of the first AC output terminal of power cell _ a1 as the first concatenated power string 310, power
First lead-out terminal and power cell _ c1 of the first AC output terminal of unit _ b1 as the second concatenated power string 320
First lead-out terminal of first AC output terminal as third concatenated power string 330, and the first of each concatenated power string
The first AC output terminal of leading-out terminal, that is, power cell _ a1, the first AC output terminal, the Yi Jigong of power cell _ b1
Asterism connection is formed between the first AC output terminal of rate unit _ c1；
Second output terminal of the second AC output terminal of power cell _ a3 as the first concatenated power string 310, power
Second output terminal and power cell _ c3 of the second AC output terminal of unit _ b3 as the second concatenated power string 320
Second output terminal of second AC output terminal as third concatenated power string 330, and the second of each concatenated power string
The second AC output terminal of leading-out terminal, that is, power cell _ a3, the second AC output terminal, the Yi Jigong of power cell _ b3
The second AC output terminal of rate unit _ c3 forms the three-phase output of current transformer 300.
In this example, in the first concatenated power string 310, the second AC output terminal and the power list of power cell _ a1
The first AC output terminal of member _ a2 connects, the second AC output terminal of power cell _ a2 and the first of power cell _ a3
AC output terminal connects；
In second concatenated power string 320, the second AC output terminal of power cell _ b1 and the first of power cell _ b2
AC output terminal connects, the second AC output terminal of power cell _ b2 and the first AC output terminal of power cell _ b3
Connection；
In third concatenated power string 330, the second AC output terminal of power cell _ c1 and the first of power cell _ c2
AC output terminal connects, the second AC output terminal of power cell _ c2 and the first AC output terminal of power cell _ c3
Connection.
In some embodiments, each concatenated power string in current transformer 300 may include greater number of power cell,
The quantity of power cell can be more than or equal to 3 in i.e. each concatenated power string.
As shown in figure 4, current transformer 300 includes three concatenated power strings, each concatenated power string includes N number of power cell,
Each power cell has one group of three-phase input end, and the direct wind-driven generator in the embodiment of the present invention is sent out for Multiple coil directly-driven wind
Motor, the rotor and wind power generating set of the Multiple coil direct wind-driven generator are coaxially connected, which determines
Attached bag includes 3N winding, and N is the integer more than or equal to 3, wherein every 3 windings constitute the Multiple coil direct wind-driven generator
The output of one group of three-phase, the N group three-phases of double-fed generator export the three-phase with N number of power cell of each concatenated power string respectively
Input terminal is correspondingly connected with.
It in embodiments of the present invention, can be by limiting the winding quantity of stator in Multiple coil direct wind-driven generator come about
The output voltage of beam current transformer.Therefore, the current transformer of the embodiment of the present invention can be by by the power in each concatenated power string
Unit carries out the cascade mode of modularization, and superposition exports higher voltage, greatly reduces output current, and with output detuning
The advantage that wave is few, the degree of modularity is high；Meanwhile it being carried out different from current low-voltage high-capacity current transformer in parallel to promote current transformer appearance
The selection of amount improves the reliability of blower fan system so as to avoid the technical problems such as stream and circulation.
Fig. 5 shows the concrete structure schematic diagram of power cell according to an embodiment of the invention.As shown in figure 5, conduct
One of one of current transformer 300 concatenated power string power cell, which may include sequentially connected
Three-phase converter module 3111, bus capacitor and discharge resistance 3112, chopper circuit module 3113 and H formula leg inverters
Module 3114.
As shown in figure 5, three-phase converter module 3111, is configured as via its of three pole reactor and direct wind-driven generator
In the connection of one group of three-phase windings, and be configured as carrying out rectification, general to the low-frequency ac electric energy that direct wind-driven generator export
Low-frequency ac electric energy is converted to direct current energy.
As an example, three-phase converter module for example can be Three-Phase PWM Rectifier.
Bus capacitor and discharge resistance 3112 are configured as being connected to two output ends of three-phase converter module.In Fig. 5
In, bus capacitor can be configured as and the direct current energy being converted to is filtered and stored the direct current energy, electric discharge electricity
Resistance, which can be configured as, discharges to the electricity stored in bus capacitor.
Chopper circuit module 3113 is configured as when DC bus-bar voltage is more than preset DC bus-bar voltage threshold value,
By unloading energy resistance in chopper circuit module 3113, discharge is more than the energy in the DC bus of DC bus-bar voltage threshold value.
As shown in figure 5, chopper circuit module 3113 may include switching tube Q1 between being connected in series in DC bus and
Unloading can resistance R.As an example, switching tube Q1 can be insulated gate bipolar transistor (Insulated Gate
Bipolar Transistor, IGBT).In this example, chopper circuit module 3113 can also include in parallel with energy resistance R is unloaded
Switching tube Q2, switching tube Q2 can be comprising any one in the IGBT of diode, metal-oxide-semiconductor or diode with diode
Kind, in chopper circuit module 3113, switching tube Q2 can be used as diode.
In this embodiment, DC bus-bar voltage is caused to pump when the operating mode such as low-voltage crossing occurs for the power grid of wind power plant
Rise, DC bus-bar voltage be more than predetermined DC busbar voltage threshold value when, can by control in the chopper circuit module 3113 with
The concatenated switching tube Q1 conductings of energy resistance are unloaded, make to pump the energy risen in DC bus through switching tube Q1 and unload the R progress of energy resistance
Discharge, to prevent DC bus over-pressed.
H formula leg inverters module 3114, for being converted into the adjustable direct current energy of voltage to meet the work of grid requirements
Frequency AC energy.
In one embodiment, as shown in figure 5, H formula leg inverters module (can be referred to as H bridges in described below) is wrapped
Two bridge arms in parallel are included, each bridge arm includes two concatenated power pipe units；Two outputs of H formula leg inverter modules
End is the first ac terminal and second ac terminal.
In embodiments of the present invention, the input of each power cell of the concatenated power string in current transformer and Multiple coil direct current
One group of three-phase windings of generator connect, and the output of the power cell is the two-way ac output end of H formula leg inverter modules
Son, wherein the first ac terminal of the H bridges is connected with the second ac terminal of a upper power cell for serial connection, the H
Second ac terminal of bridge is connected with the first ac terminal of next power cell of serial connection.
Fig. 6 shows the structural schematic diagram of the electric-control system provided according to one embodiment of the invention.As shown in fig. 6, one
In a embodiment, electric-control system 600 may include：
The current transformer 300 of direct wind-driven generator 200 and above-described embodiment description；Direct wind-driven generator 200, is configured
It includes multiple windings to be, the quantity of multiple windings can be 3N, and N is the positive integer more than or equal to 3.Wherein, every three winding shapes
At one group of three-phase windings；Current transformer 300 is configured as connecting with direct wind-driven generator by multiple windings.
In this embodiment, the rotor of direct wind-driven generator 200 and the wind wheel of wind power generating set 100 directly connect
Capable driving is tapped into, and the current transformer being connect with direct wind-driven generator 200 can be full power convertor.
With continued reference to Fig. 5, in one embodiment, electric-control system 600 can also include：Variable blade control system 610 and master
Control system 620.
In one embodiment, variable blade control system 610 can be used for adjusting wind power generating set with the variation of wind speed
Paddle pitch angle (abbreviation propeller pitch angle), the output power of stable generator.Specifically, variable blade control system 610 can control
Position angle, that is, propeller pitch angle of the leaf chord length of wind-driven generator relative to Plane of rotation leads to when wind speed is higher than rated wind speed
Overregulate the propeller pitch angle of blade, the pneumatic torque and pneumatic power of control wind wheel capture, enable Wind turbines with it to greatest extent
Ground captures wind energy, stable output power.
In one embodiment, master control system 620 can be used for being led to variable blade control system 610 and current transformer 300
News send out pitch control instruction to variable blade control system 610, and are communicated with current transformer 300, by control current transformer with
Adjust the active power and reactive power of wind-driven generator.
Specifically, master control system 620 can be with receiver tank and the signal of variable blade control system, with variable blade control system
610 are communicated, and send out pitch control instruction to variable blade control system 610, control variable blade control system is completed to blade pitch
Maximal wind-energy capture and constant-speed operation are realized in the adjusting at angle；And the wattful power of wind-driven generator is adjusted for controlling current transformer 300
Rate and reactive power；And communicated with central control system, transmit information etc..
In this embodiment, master control system 620 is the main body of the control system of wind-driven generator, may be implemented to send out wind-force
The automatic startup of motor, automatic speed regulation, auto-parallel, failure autostop, automatic cable unwinding, automatically records automatic direction regulating
With monitoring etc. important control and defencive function.
Fig. 7 is the structural schematic diagram for showing wind power plant transmission system according to an embodiment of the invention, Fig. 7 and Fig. 6 phases
Same or equivalent structure uses identical label.As shown in fig. 7, wind power plant transmission system 700 may include：
Electric-control system 600, multigroup duplex frequency boostering transformer 710 described in multigroup above-described embodiment and medium-pressure electricity supply busbar
720；Wherein,
The low-pressure side of every group of duplex frequency boostering transformer 710 is connect with one group of electric-control system 600 in multigroup electric-control system, often
Group duplex frequency boostering transformer 710 is connect by inductance with medium-pressure electricity supply busbar three-phase 720；710 quilt of multigroup duplex frequency boostering transformer
It is configured to be converted into the industrial frequency AC electric energy for meeting grid requirements that multigroup electric-control system 600 exports to meet grid requirements
Middle pressure AC energy, and the middle pressure AC energy being converted to is accessed into medium-pressure electricity supply busbar 720.
As shown in fig. 7, wind power plant transmission system 700 can also include：Boost transmitting transformer 730, is configured as by
Pressure AC energy is converted into the AC energy of default transmission voltage grade, and will convert into the alternating current of default transmission voltage grade
It can incoming transport transmission of electricity busbar 740.
With continued reference to Fig. 7, in one embodiment, wind power plant transmission system 700 can also include：Reactive power compensator
750, the medium-pressure electricity supply that reactive power compensator 750 can be parallel to medium-pressure electricity supply busbar 720 between the transmitting transformer 730 that boosts
In network, also, reactive power compensator 700 can be configured as centering pressure supply network and carry out reactive-load compensation.
Current transformer, electric-control system and wind power plant transmission system according to the ... of the embodiment of the present invention, pass through converter module grade
The mode of connection increases the output voltage of current transformer, greatly reduces output current, reduces the use of high-volume low-voltage cable,
Loss is reduced, efficiency is improved.Meanwhile it avoiding current low-voltage high-capacity current transformer and must carry out the choosing of hoist capacity in parallel
It selects, avoids the technical problems such as stream and circulation, improve the reliability of blower fan system.
The other details of current transformer according to the ... of the embodiment of the present invention with above in association with Fig. 1 to Fig. 5 describe according to the present invention
The current transformer of embodiment is similar, and details are not described herein.
It should be clear that the invention is not limited in specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But procedure of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition after the spirit for understanding the present invention, or suitable between changing the step
Sequence.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of current transformer for wind power plant transmission system, which is characterized in that the current transformer includes three concatenated power strings；
Wherein,
Each concatenated power string includes first lead-out terminal and second output terminal, the first output of each concatenated power string
Asterism connection is formed between terminal, second output terminal of each concatenated power string forms three-phase output；
The three-phase input of each concatenated power string and the direct wind-driven generator of wind power generating set connect.
2. current transformer according to claim 1, which is characterized in that each concatenated power string includes multiple power lists
Member；Wherein,
The three-phase input of each power cell is connect with one group of three-phase windings of the direct wind-driven generator correspondingly；
It is connected in series between the multiple power cell of each concatenated power string；
Each power cell includes the first AC output terminal and the second AC output terminal, phase in each concatenated power string
The second ac terminal of a upper power cell connects with the first ac terminal of next power cell in adjacent two power cells
It connects, the first ac terminal of first power cell of the serial connection of each concatenated power string is as each cascade
The first lead-out terminal of power string, the second exchange of the last one power cell of the serial connection of each concatenated power string
Second output terminal of the terminal as each concatenated power string.
3. current transformer according to claim 2, which is characterized in that each power cell includes sequentially connected three-phase
Rectifier module, bus capacitor, discharge resistance, chopper circuit module and H formula leg inverter modules, wherein
The three-phase converter module is configured as the one of which three-phase via three pole reactor and the direct wind-driven generator
Winding connects, and is configured as carrying out rectification to the low-frequency ac electric energy that the direct wind-driven generator exports, will be described low
Frequency AC energy is converted to direct current energy；
The bus capacitor and the discharge resistance are configured as being connected to two output ends of the three-phase converter module；
The chopper circuit module is configured as when the DC bus-bar voltage is more than preset DC bus-bar voltage threshold value,
Energy resistance is unloaded by the way that the chopper circuit mould is in the block, discharge is more than the energy in the DC bus of the DC bus-bar voltage threshold value
Amount；
The H formulas leg inverter module, for being converted into the adjustable direct current energy of the voltage to meet the work of grid requirements
Frequency AC energy.
4. current transformer according to claim 3, which is characterized in that
The H formulas leg inverter module includes two bridge arms in parallel, and each bridge arm includes two concatenated power pipe units；
Two output ends of the H formulas leg inverter module are first ac terminal and second ac terminal.
5. a kind of electric-control system for wind power plant transmission system, which is characterized in that the electric-control system includes directly-driven wind hair
Motor and the current transformer as described in any one of claim 1-4；
The direct wind-driven generator is configured as including multiple windings, and the quantity of the multiple winding is 3N, and every three
Winding forms one group of three-phase windings, wherein N is the integer more than or equal to 3；
The current transformer is configured as connecting with the direct wind-driven generator by the multiple winding.
6. electric-control system according to claim 5, which is characterized in that the electric-control system further includes master control system and variable pitch
Control system；
The master control system is configured for being communicated with the variable blade control system and current transformer, to the pitch control
System sends out pitch control instruction, and is communicated with the current transformer, and wind-force hair is adjusted by controlling the current transformer
The active power and reactive power of motor；
The variable blade control system is configured for instructing the pitch for adjusting blade of wind-driven generator according to the pitch control
Angle.
7. a kind of wind power plant transmission system, which is characterized in that the wind power plant transmission system includes：
Multigroup such as electric-control system described in claim 5 or 6, multigroup duplex frequency boostering transformer and medium-pressure electricity supply busbar；Wherein,
The low-pressure side of every group of duplex frequency boostering transformer is connect with one group of electric-control system in multigroup electric-control system, described every group
Duplex frequency boostering transformer is connected by inductance with medium pressure power supply buses three；
Multigroup duplex frequency boostering transformer is configured for the work for meeting grid requirements of multigroup electric-control system output
Frequency AC energy is converted into meeting the middle pressure AC energy of grid requirements, and the middle pressure AC energy being converted to is accessed
Medium pressure power supply buses.
8. wind power plant transmission system according to claim 7, which is characterized in that the wind power plant transmission system further includes：
Boost transmitting transformer and ac transmission busbar；
Boost transmitting transformer, is configured as medium pressure AC energy being converted into the alternating current of default transmission voltage grade
Can, and the AC energy of the default transmission voltage grade is accessed into the ac transmission busbar.
9. wind power plant transmission system according to claim 8, which is characterized in that the wind power plant transmission system further includes：
Reactive power compensator, the reactive power compensator be parallel to medium pressure power supply buses and the boosting transmitting transformer it
Between medium-pressure electricity supply network in, also, the reactive power compensator is configured as carrying out idle benefit to medium pressure supply network
It repays.
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| CN201711432843.9A CN108631355A (en) | 2017-12-26 | 2017-12-26 | Converter, electric control system and wind farm power transmission system |
| PCT/CN2018/092000 WO2019128145A1 (en) | 2017-12-26 | 2018-06-20 | Converter and electric control system for wind farm power transmission system, and power transmission system |
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|---|---|---|---|
| CN201711432843.9A CN108631355A (en) | 2017-12-26 | 2017-12-26 | Converter, electric control system and wind farm power transmission system |
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| CN114123301A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Series double-wind wheel single-motor direct-current series-parallel switching unified grid-connected system |
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| CN114285068A (en) * | 2021-11-17 | 2022-04-05 | 中国华能集团清洁能源技术研究院有限公司 | Wind power generation collection system with fans connected in parallel and networked |
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