CN106340894A - Permanent magnetic direct-driven wind generating set grid connected method, device and system - Google Patents
Permanent magnetic direct-driven wind generating set grid connected method, device and system Download PDFInfo
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- CN106340894A CN106340894A CN201610806337.0A CN201610806337A CN106340894A CN 106340894 A CN106340894 A CN 106340894A CN 201610806337 A CN201610806337 A CN 201610806337A CN 106340894 A CN106340894 A CN 106340894A
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- 238000005516 engineering process Methods 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a permanent magnetic direct-driven wind generating set grid connected method, device and system and aims to solve a dc grid connected problem of a permanent magnetic direct-driven wind generating set and an unstable voltage problem of a DC bus. The method comprises steps that S1, the wind generating set is set to have a main set and a secondary set which respectively control a target; S2, a voltage amplitude of a present power grid is detected, if the voltage amplitude drops to below 90%, a power grid state is determined to be in fault; S3, the power grid state is determined according to the S2, the main set realizes constant voltage control, and the secondary set selects a work state.
Description
Technical field
The present invention relates to wind-driven generator control technology field, more particularly, to a kind of permanent magnet direct-driving aerogenerator group is grid-connected
Method, apparatus and system.
Background technology
In the last few years, the distributed energy with wind energy as representative with its cleaning, renewable many advantages, such as, obtain energetically
Development.With its distributed power generation intermittent, uncertain the features such as, be directly incorporated into existing public electric wire net, can be to electrical network
The safe and reliable operation of peak regulation and system all can cause significant impact.This is also the main of different degrees of " abandoning wind " phenomenon of appearance
Reason.
A kind of permanent magnetism direct drive wind that permanent magnet direct-drive wind-powered electricity generation provides as the Main Patterns of wind-powered electricity generation field future development, the present invention
Power generator group combination method, solves the DC bus-bar voltage instability problem under distributed DC micro-capacitance sensor background.In China
Following new source generates electricity, distributed power grid construction field has prospect of necessarily using.
Content of the invention
Embodiments provide a kind of permanent magnet direct-driving aerogenerator group combination method, apparatus and system, for reality
The direct current of existing permanent magnet direct-driving aerogenerator group is grid-connected and solves the problems, such as that DC bus-bar voltage is unstable.
The present invention provides a kind of permanent magnet direct-driving aerogenerator group combination method, comprising:
Step s1, setting wind power generating set is divided into host groups and slave group, respectively control targe；
Step s2, the voltage magnitude of detection current electric grid, if voltage magnitude drops into less than 90%, that is, it is judged to electrical network
Malfunction；
Step s3, judges electric network state according to step s2, and host groups realize Isobarically Control, slave group selection working condition.
Alternatively, described step s3 includes:
Step s31, when electrical network is normal, described host groups realize Isobarically Control, and slave group realizes maximal wind-energy capture shape
State；
Step s32, when the grid fails, described host groups realize Isobarically Control, and slave group realizes Isobarically Control state.
Alternatively, described step s31 specifically includes:
Step s311, when described slave group realizes maximal wind-energy capture state, direct-current grid meets DC load in net
Power demands, unnecessary electric energy passes through dc/ac current transformer and feeds to public electric wire net.
Alternatively, described step s32 specifically includes:
Step s321, when described slave group realizes Isobarically Control, blower fan power output is less than blower fan input power, and blower fan turns
Speed is accelerated, and when rotation speed of fan is accelerated, when exceeding rotational speed limit, blower fan is automatically obtained variable pitch control, reduces wind energy input.
The present invention provides a kind of permanent magnet direct-driving aerogenerator group grid-connection control device, comprising:
Discriminating module, for dividing into host groups as claimed in claim 1 and slave group by wind power generating set；
Detection module, for detecting the voltage magnitude of current electric grid, if voltage magnitude drops into less than 90%, that is, judges
For grid failure state；
Control module, for the electric network state being judged according to detection module, control main frame group realizes constant voltage, controls slave group
Select working condition.
Alternatively, control module specifically includes:
First control submodule, for when electrical network is normal, control main frame group realizes constant voltage, controls slave group to realize maximum
Wind energy extraction state；
Second control submodule, for when the grid fails, control main frame group realizes constant voltage, controls slave group to realize constant voltage
State.
Alternatively, the first control submodule concrete function includes:
First control submodule, during for controlling slave group to realize maximal wind-energy capture state, direct-current grid meets net
Interior DC load power demands, control dc/ac current transformer to feed unnecessary electric energy to public electric wire net.
Second control submodule concrete function includes:
Second control submodule, during for controlling slave group to realize constant voltage, blower fan power output is less than blower fan input power,
Rotation speed of fan is accelerated, and when rotation speed of fan is accelerated, when exceeding rotational speed limit, blower fan is automatically obtained variable pitch control, reduces wind energy defeated
Enter.
The present invention provides a kind of permanent magnet direct-driving aerogenerator group grid-connection control system, comprising: permanent magnet direct-drive wind-force generates electricity
Unit and permanent magnet direct-driving aerogenerator group grid-connection control device；
Described permanent magnet direct-driving aerogenerator group and described permanent magnet direct-driving aerogenerator group grid-connection control device communication link
Connect.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The present invention provides a kind of permanent magnet direct-driving aerogenerator group combination method, apparatus and system, wherein, permanent magnetism direct drive wind
Power generator group combination method includes: step s1, and setting wind power generating set is divided into host groups and slave group, controls mesh respectively
Mark；Step s2, the voltage magnitude of detection current electric grid, if voltage magnitude drops into less than 90%, that is, it is judged to electric network fault
State；Step s3, judges electric network state according to step s2, and host groups realize Isobarically Control, slave group selection working condition；This
A kind of permanent magnet direct-driving aerogenerator group combination method of bright offer, can improve the beneficial effect of the stability of DC bus-bar voltage
Really.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 provides a kind of stream of an embodiment of permanent magnet direct-driving aerogenerator group combination method for the embodiment of the present invention
Journey schematic diagram；
Fig. 2 is another embodiment of a kind of permanent magnet direct-driving aerogenerator group combination method provided in an embodiment of the present invention
Schematic flow sheet；
Fig. 3 is a kind of structural representation of permanent magnet direct-driving aerogenerator group grid-connection control device provided in an embodiment of the present invention
Figure；
Fig. 4 is the permanent magnetism direct drive wind in a kind of permanent magnet direct-driving aerogenerator group combination method provided in an embodiment of the present invention
Group of motors distributed DC grid-connected fabric topology figure
Fig. 5 provides two kinds of Wind turbines in a kind of permanent magnet direct-driving aerogenerator group combination method for the embodiment of the present invention
The control method schematic diagram of working condition；
Fig. 6 provides the variable pitch control in a kind of permanent magnet direct-driving aerogenerator group combination method former for the embodiment of the present invention
Reason figure.
Specific embodiment
Embodiments provide a kind of permanent magnet direct-driving aerogenerator group combination method, apparatus and system, for reality
The direct current of existing permanent magnet direct-driving aerogenerator group is grid-connected and solves the problems, such as that DC bus-bar voltage is unstable.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Refer to Fig. 1, an a kind of reality of permanent magnet direct-driving aerogenerator group combination method provided in an embodiment of the present invention
Apply example to include:
S1, setting wind power generating set are divided into host groups and slave group, control targe respectively；
In the present embodiment, wind-driven generator group is divided into mair motor group and auxiliary-motor group, wherein mair motor group is mainly real
Existing group of planes output voltage, and the stablizing of direct-current grid common bus.
S2, the voltage magnitude of detection current electric grid, if voltage magnitude drops into less than 90%, that is, are judged to electric network fault
State；
In the present embodiment, wind farm grid-connected standard was worked out in 2009 according to China, voltage magnitude drop into 90% with
When lower, that is, it is judged to grid failure state.
S3, electric network state is judged according to step s2, host groups realize Isobarically Control, slave group selection working condition；
In the present embodiment, slave group is respectively provided with two kinds of working conditions, respectively maximal wind-energy capture working condition and perseverance
Pressure state of a control.
The above is that a kind of permanent magnet direct-driving aerogenerator group combination method is described in detail, below will be to concrete mistake
Journey is described in detail, and refers to Fig. 2, and the present invention provides another of a kind of permanent magnet direct-driving aerogenerator group combination method
Embodiment includes:
Step s31, when electrical network is normal, described host groups realize Isobarically Control, and slave group realizes maximal wind-energy capture shape
State；
When electrical network is in normal condition, slave group is operated with maximal wind-energy capture state, and mair motor group is realized permanent
Voltage-controlled system.
Step s32, when the grid fails, described host groups realize Isobarically Control, and slave group realizes Isobarically Control state.
When line voltage is less than 90%, then it is in malfunction for electrical network, whole units carry out Isobarically Control, protect direct current
Stablizing of micro-capacitance sensor common bus voltage, realizes the low voltage crossing of DC micro power grid system.
Step s311, when described slave group realizes maximal wind-energy capture state, direct-current grid meets DC load in net
Power demands, unnecessary electric energy passes through dc/ac current transformer and feeds to public electric wire net.
Step s321, when described slave group realizes Isobarically Control, blower fan power output is less than blower fan input power, and blower fan turns
Speed is accelerated, and when rotation speed of fan is accelerated, when exceeding rotational speed limit, blower fan is automatically obtained variable pitch control, reduces wind energy input.
Above-mentioned is to provide a kind of step s3 detailed process of permanent magnet direct-driving aerogenerator group combination method to enter the present invention
A kind of permanent magnet direct-driving aerogenerator group grid-connecting apparatus present invention being provided with an embodiment are entered by row detailed description below
The detailed description of row, refers to Fig. 3, an a kind of enforcement of permanent magnet direct-driving aerogenerator group grid-connecting apparatus that the present invention provides
Example includes:
Discriminating module 101, for dividing into host groups as claimed in claim 1 and slave group by wind power generating set；
Detection module 102, for detecting the voltage magnitude of current electric grid, if voltage magnitude drops into less than 90%, that is,
It is judged to grid failure state；
Control module 103, for the electric network state being judged according to detection module, control main frame group realizes constant voltage, controls secondary
Unit optimum selection working condition
First control submodule 1031, for when electrical network is normal, control main frame group realizes constant voltage, controls slave group to realize
Maximal wind-energy capture state, direct-current grid meets DC load power demands in net, controls dc/ac current transformer by unnecessary electric energy
To public electric wire net feeding；
Second control submodule 1032, for when the grid fails, control main frame group realizes constant voltage, controls slave group to realize
Pressure constant state, blower fan power output is less than blower fan input power, and rotation speed of fan is accelerated, and when rotation speed of fan is accelerated, exceedes rotating speed limit
During value, blower fan is automatically obtained variable pitch control, reduces wind energy input.
Above-mentioned is that a kind of permanent magnet direct-driving aerogenerator group grid-connection control device that the present invention is provided carries out detailed retouching
State, the present invention will be described in detail to a kind of permanent magnet direct-driving aerogenerator group grid-connection control system with an embodiment below
A kind of permanent magnet direct-driving aerogenerator group grid-connection control system providing includes:
A kind of permanent magnet direct-driving aerogenerator group grid-connection control system provided in an embodiment of the present invention includes: permanent magnetism direct drive wind
Power generator group and permanent magnet direct-driving aerogenerator group grid-connection control device；
Described permanent magnet direct-driving aerogenerator group and described permanent magnet direct-driving aerogenerator group grid-connection control device communication link
Connect.
Above-mentioned is that a kind of permanent magnet direct-driving aerogenerator group grid-connection control system that the present invention is provided carries out detailed retouching
State, then to introduce the combination method of the present invention below with a concrete application, the sea of Fig. 4, Fig. 5 and Fig. 6 present invention offer is provided
One application examples of the permanent magnet direct-driving aerogenerator group combination method of upper wind energy turbine set includes:
As shown in figure 4, by ac/dc current transformer by the unit DC side parallel of same for a windward side air draft group of planes to distributed
Direct-current grid common bus, more different draught fan group common bus are together in series.By micro-capacitance sensor series current and general power
It is evenly distributed to each blower fan.Current transformer adopts voltage-source type HVDC technology (vsc-hvdc) transverter；Transverter on the bank
Will be using two level vsc transverters.Realize energy exchange to realize distributed DC micro-capacitance sensor with public electric wire net on the bank；This example
Permanent magnet direct-driving aerogenerator group, rated power is 1.5mw, and generator is surface-mount type non-salient pole permanent magnet synchronous generator.
As shown in figure 5, the outer shroud control targe of master control unit is to realize group of planes output voltage, and direct-current grid is public
The stablizing of bus.The busbar voltage grade setting value of this group of planes and Real-time Feedback value are made to compare, and control output to make by pi controller
Give for q axle stator currentMeet zero d shaft current to control, d axle stator current set-pointFor 0；Other units realize two kinds
Working condition, a kind of is normal operating conditions, and current transformer controls the maximal wind-energy capture state that is operated in, and controls outer shroud target by
Big wind energy tracing algorithm obtains power outputThe power output obtaining of this calculatingActual wattful power with feedback unit
Rate pgWork compares, and controls output to be used as q axle stator current by pi controller and givesD axle is realized zero d axle and is controlled；Another kind is
Isobarically Control state, control method is equal to the control method of master control unit；Described control method, other control systems other
Part, such as electric voltage feed forward, coordinate transform, svpwm ripple are modulated all using prior art, and the present invention is not repeating；DC micro-electric
When net grid-connected system normally runs, master control unit realizes Isobarically Control, and other units enter maximal wind-energy capture working condition；Directly
Stream micro-capacitance sensor realizes energy exchange with public electric wire net.Direct-current grid meets DC load power demands in the net of island, unnecessary electricity
Can be by the ashore public electric wire net feeding of dc/ac current transformer；When Voltage Drop in public electric wire net on the bank, all units are realized
Isobarically Control, it is ensured that stablizing of direct-current grid common bus voltage, realizes the low voltage crossing of DC micro power grid system.All
When unit realizes Isobarically Control, blower fan power output is less than blower fan input power, and rotation speed of fan is accelerated, if rotation speed of fan mistake
Hurry up, when exceeding rotational speed limit, be automatically obtained variable pitch control, reduce wind energy input.
As shown in fig. 6, the control device of propeller pitch angle is made up of wind energy limiter and rotational speed regulation.In figure pgFor separate unit blower fan
The active power producing；ωmFor wind energy conversion system rotating shaft rotating speed；pmaxLimit reference value for active power；ωmaxTurn for wind energy conversion system rotating shaft
Speed limit determines reference value.The output of the output speed adjuster of wind energy limiter, the controlled quentity controlled variable output superposition of both becomes change oar
Away from instruction references value β controlling.
The above, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to front
State embodiment the present invention has been described in detail, it will be understood by those within the art that: it still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to wherein some technical characteristics；And these
Modification or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a kind of permanent magnet direct-driving aerogenerator group combination method is it is characterised in that include:
Step s1, setting wind power generating set is divided into host groups and slave group, respectively control targe；
Step s2, the voltage magnitude of detection current electric grid, if voltage magnitude drops into less than 90%, that is, it is judged to electric network fault
State；
Step s3, judges electric network state according to step s2, and host groups realize Isobarically Control, slave group selection working condition.
2. permanent magnet direct-driving aerogenerator group combination method according to claim 1 is it is characterised in that described step s3 bag
Include:
Step s31, when electrical network is normal, described host groups realize Isobarically Control, and slave group realizes maximal wind-energy capture state；
Step s32, when the grid fails, described host groups realize Isobarically Control, and slave group realizes Isobarically Control state.
3. permanent magnet direct-driving aerogenerator group combination method according to claim 2 is it is characterised in that described step s31
Specifically include:
Step s311, when described slave group realizes maximal wind-energy capture state, direct-current grid meets DC load in net and powers
Demand, unnecessary electric energy passes through dc/ac current transformer and feeds to public electric wire net.
4. permanent magnet direct-driving aerogenerator group combination method according to claim 2 is it is characterised in that described step s32
Specifically include:
Step s321, when described slave group realizes Isobarically Control, blower fan power output is less than blower fan input power, and rotation speed of fan adds
Hurry up, when rotation speed of fan is accelerated, when exceeding rotational speed limit, blower fan is automatically obtained variable pitch control, reduces wind energy input.
5. a kind of permanent magnet direct-driving aerogenerator group grid-connection control device is it is characterised in that include:
Discriminating module, for dividing into host groups as claimed in claim 1 and slave group by wind power generating set；
Detection module, for detecting the voltage magnitude of current electric grid, if voltage magnitude drops into less than 90%, that is, is judged to electricity
Net malfunction；
Control module, for the electric network state being judged according to detection module, control main frame group realizes constant voltage, controls slave group selection
Working condition.
6. permanent magnet direct-driving aerogenerator group grid-connection control device according to claim 5 is it is characterised in that control module
Specifically include:
First control submodule, for when electrical network is normal, control main frame group realizes constant voltage, controls slave group to realize maximal wind-energy
Trapped state；
Second control submodule, for when the grid fails, control main frame group realizes constant voltage, controls slave group to realize constant voltage shape
State.
7. permanent magnet direct-driving aerogenerator group grid-connection control device according to claim 6 is it is characterised in that first controls
Submodule concrete function includes:
First control submodule, during for controlling slave group to realize maximal wind-energy capture state, direct-current grid meets straight in net
Current load power demands, control dc/ac current transformer to feed unnecessary electric energy to public electric wire net.
8. permanent magnet direct-driving aerogenerator group grid-connection control device according to claim 6 is it is characterised in that second controls
Submodule concrete function includes:
Second control submodule, during for controlling slave group to realize constant voltage, blower fan power output is less than blower fan input power, blower fan
Faster rotational speed, when rotation speed of fan is accelerated, when exceeding rotational speed limit, blower fan is automatically obtained variable pitch control, reduces wind energy input.
9. a kind of permanent magnet direct-driving aerogenerator group grid-connection control system is it is characterised in that include:
Permanent magnet direct-driving aerogenerator group, and the permanent magnet direct-driving aerogenerator as described in any one in claim 5 to 8
Group grid-connection control device；
Described permanent magnet direct-driving aerogenerator group and described permanent magnet direct-driving aerogenerator group grid-connection control device communication connection.
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| CN201610806337.0A CN106340894B (en) | 2016-09-06 | 2016-09-06 | A kind of permanent magnet direct-driving aerogenerator group combination method, apparatus and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806337.0A CN106340894B (en) | 2016-09-06 | 2016-09-06 | A kind of permanent magnet direct-driving aerogenerator group combination method, apparatus and system |
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Cited By (1)
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| CN111463825A (en) * | 2020-04-10 | 2020-07-28 | 华中科技大学 | Low-voltage ride through control method and system for photovoltaic-containing direct-current power distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111463825A (en) * | 2020-04-10 | 2020-07-28 | 华中科技大学 | Low-voltage ride through control method and system for photovoltaic-containing direct-current power distribution system |
| CN111463825B (en) * | 2020-04-10 | 2021-11-30 | 华中科技大学 | Low-voltage ride through control method and system for photovoltaic-containing direct-current power distribution system |
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