CN106130076A - A kind of low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors - Google Patents
A kind of low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors Download PDFInfo
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- CN106130076A CN106130076A CN201610681432.2A CN201610681432A CN106130076A CN 106130076 A CN106130076 A CN 106130076A CN 201610681432 A CN201610681432 A CN 201610681432A CN 106130076 A CN106130076 A CN 106130076A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
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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
-
- 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
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The present invention proposes a kind of low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors, solves the most double-fed problem different on also network interface compared with the Synchronous generator in conventional power plant with total power changing type Wind turbines.The present invention proposes a kind of low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors, use self-styled closed form electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation synchronous generator rotor axle, make power transmit to electrical excitation synchronous generator pusher side from gear box side, and network interface is described electrical excitation synchronous generator.The self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention and control method thereof, avoid Wind turbines and be connected with electrical network the pollution that electrical network is likely to result in because of converter, achieve the unification on also network interface of Wind turbines and conventional power plant, it is truly realized the target of Wind turbines " electrical network friendly ", may advantageously facilitate the further development of this clean energy resource of wind-powered electricity generation.
Description
Technical field
The present invention relates to wind-powered electricity generation field, particularly to the controlling party of a kind of self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method.
Background technology
The wind power generating set of current main-stream is double-fed and total power changing type Wind turbines, and both Wind turbines are all
Wind speed round can be made to change with the change of wind speed, it is achieved thereby that capture the ability of wind energy to greatest extent.However as wind-powered electricity generation
The raising of proportion in electrical network, Wind turbines participates in supporting the demand of line voltage and frequency and improves constantly, this two side
Face current wind generator unit Shortcomings compared with conventional power generation usage unit.
In terms of line voltage support, in Double-feed wind power unit, generator unit stator is joined directly together with electrical network, line voltage
Fall and stator and rotor can be caused to cross stream and dc bus overvoltage.Owing to the Converter Capacity of Double-feed wind power unit is limited, because of
This current transformer is not enough to the control ability of double-fed generator, and this has resulted in Double-feed wind power unit to events such as grid voltage sags
Hinder very sensitive.In order to prevent doubly-fed generation machine rotor overvoltage, cross stream and current transformer dc bus overvoltage, a kind of effective method
Being to increase hardware Crowbar circuit, but once Crowbar puts into, rotor-side converter will lose rotor current actively control
The ability of system, double-fed generator is equivalent to a cage induction motor and runs, and current transformer no longer has to be had Wind turbines output
The ability that merit power and reactive power independently control.Now, Wind turbines does not simply fails to send reactive power and supports line voltage,
Certain reactive power is absorbed from electrical network on the contrary due to the needs of generator excitation.For total power changing type Wind turbines, lean against
Electromotor and electrical network are isolated by back of the body current transformer, and therefore the low voltage ride-through capability of this unit is better than Double-feed wind power unit.When
When line voltage falls, net side converter sends reactive power to electrical network and supports line voltage, puts into dc bus off-load
Resistance, to consume the excess energy of DC side accumulation, prevents dc bus overvoltage.While it is true, owing to electronic power switch fills
Putting overvoltage and overcurrent very sensitive, in very short time, overvoltage or stream excessively are all likely to result in the damage of switching device, therefore
Electronic power switch device its overload capacity compared with synchronous generator is very limited, and this has resulted in double-fed and total power change
The reactive power that Wind turbines of remodeling sends when grid voltage sags is difficult to support line voltage.
Causing the reason of the problems referred to above is the most double-fed and same with conventional power plant of total power changing type Wind turbines
The difference on also network interface compared by step generating set, and the also network interface of both Wind turbines is no longer to synchronize on the surface
Electromotor, essentially, both Wind turbines are current-control type power supply and Synchronous generator is voltage-controlled type
Power supply.
Summary of the invention
For solving above-mentioned deficiency of the prior art, the present invention proposes a kind of for self-styled closed form electromagnetic coupled speed governing wind-powered electricity generation
The low voltage traversing control method of unit, this set grid-connection interface is an electrical excitation synchronous generator, self-styled closed form electromagnetism coupling
Close arrangements for speed regulation connection gear box high speed shaft and synchronous generator rotor axle, and realize power from gear box side to synchronous generator
The transmission of side.
The technical scheme is that and be achieved in that:
A kind of low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors, uses self-styled closed form
Electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation synchronous generator rotor axle, make power from gear box side to electricity
Excitation synchronous generator side is transmitted, and network interface is described electrical excitation synchronous generator；
Described self-styled closed form electromagnetic coupled arrangements for speed regulation are by electromagnetic coupler, converter and magneto alternator group
Becoming, magneto alternator is for inverter supply；Described electromagnetic coupler has two rotating shafts, encourages with gear-box and electricity respectively
Magnetic-synchro generator electric also all rotates, the relative rotation speed of two rotating shafts of Frequency Converter Control electromagnetic coupler and electromagnetic torque；
A piece axle of the high speed shaft of described gear-box and described electromagnetic coupler is connected and constitutes front axle system, described electromagnetic coupled
Another root axle of device and the armature spindle of described electrical excitation synchronous generator are connected composition rear axle mechanism, axle system be 2 independent
Axle system, described magneto alternator and front axle system coaxially realize described inverter supply；
Initially enter start-up course；After start-up course completes, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to
Simultaneous interconnecting process；Capture wind energy to greatest extent after set grid-connection and stopping process；
Line voltage once falls and exceeds normal range, the control of self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Proceed to low voltage crossing control model, owing to converter is to be supplied by the magneto alternator coaxial with high speed shaft of gearbox
Electricity, falling of line voltage will not produce impact to the power supply of converter, in order to keep unit output watt current constant, frequency conversion
Device torque instruction value Tcmd_LVRTComputing formula be:
Tcmd_LVRT=kTcmd (1)
In formula, k is the perunit value of line voltage, TcmdWhen substantially running for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
The converter torque instruction value tried to achieve by wind wheel optimum mechanical characteristic, propeller pitch angle ask for phase normal with line voltage
With, use pi regulator to try to achieve according to wind speed round desired value and measured value；
After line voltage recovers, it is gradually reduced the exciting current of electrical excitation synchronous generator, makes the nothing that Wind turbines sends
Merit power recovers the reactive power value sent to grid voltage sags.
Alternatively, described start-up course is divided into three phases:
First, in the first stage, by pitch control, make wind speed round be gradually increasing, when current axis system rotating speed is sufficiently high,
The output voltage of magneto alternator meets inverter supply voltage request, now starts converter and is set to rotating speed control mould
Formula, by Frequency Converter Control electromagnetic coupler, makes rear axle mechanism ramp up to front axle system rotating speed；
It follows that entrance second stage, make axle system synchronous rotary by Frequency Converter Control, until close to setting
Tachometer value less than electrical excitation synchronous generator synchronous speed:
In formula: nIRotating speed for front axle system；nIIRotating speed for rear axle mechanism；n1Synchronous speed for electrical excitation synchronous generator；f
For mains frequency；P is the number of pole-pairs of electrical excitation synchronous generator；
Finally, enter the phase III, pitch control keep front axle system rotating speed constant, and by Frequency Converter Control electromagnetism coupling
Clutch makes rear axle mechanism continue raising speed, until higher than electrical excitation synchronous generator synchronous speed Δ n；
nII=nI+Δn (3)。
Alternatively, startup stage complete after, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to simultaneous interconnecting mistake
Journey, cutting-in control cabinet is according to the difference in magnitude measured between electric excitation generator set end voltage and the line voltage obtained and phase place
Difference, dynamically regulation exciting current and the frequency of converter output, allow when these difference in magnitude and phase contrast are reduced to grid-connected requirement
During value, grid-connected switch automatic closing, at this moment, converter is switched to torque control model by rotating speed control mode.
Alternatively, after Wind turbines is grid-connected, need to regulate the output of electrical excitation synchronous generator to current wind
The a certain power that condition adapts, in self-styled closed form electromagnetic coupled speed-regulating wind group of motors, power adjustments is to pass through Frequency Converter Control
The electromagnetic torque of electromagnetic coupler completes, and adds the uninstall process impact to electrical network to slow down electrical excitation synchronous generator, needs
Ramp function is set in power instruction and carries out transition.
Alternatively, when wind speed is less than rated wind speed, running of wind generating set keeps at underpower state, paddle pitch angle θ
Near 0 degree, Wind turbines uses the MPPT maximum power point tracking strategy not relying on measuring wind speed；Wherein, electromagnetic coupler
Electromagnetic torque is as the control variable of regulation wind speed round；According to current wind speed round, special from preset wind wheel optimum machinery
By the command value obtaining torque of tabling look-up in linearity curve, transfer to the electromagnetic torque of Frequency Converter Control electromagnetic coupler；
When wind speed is higher than rated wind speed, running of wind generating set is in invariable power state；At this moment, the electromagnetism of electromagnetic coupler turns
Square maintains nominal torque value, pitch control keep wind speed round near rated speed；
When Wind turbines off-the-line normal from electrical network, the most progressively reduce the electromagnetic torque of electromagnetic coupler, unload de-electrifying encouraging
The load of magnetic-synchro electromotor, after reaching Light Condition, then disconnects the grid-connected switch in cutting-in control cabinet；Wind turbines off-grid
After, converter is switched to rotating speed control mode by torque control model.
Alternatively, described stopping process is divided into 2 stages:
First, pitch control rotating speed when making front axle system rotating speed be maintained at grid-connected switch separating brake, and by converter control
Electromagnetic coupler processed realizes electromagnetic braking, and to make rear axle mechanism be decelerated to equal with front axle system rotating speed；Then, pitch control wind wheel is made
Rotating speed be gradually reduced, when rotating speed is sufficiently high enable converter normal power supply time control forward and backward 2 the axle systems of electromagnetic coupler with
Step rotates, and when rotating speed is too low, converter quits work, and rear axle mechanism frictionally braking moment and front axle system control final by feathering
Complete the shutdown of Wind turbines.
The invention has the beneficial effects as follows:
(1) self-styled closed form electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation synchronous generator rotor are used
Axle, and realize the transmission of power, converter is connected with the magneto alternator coaxial with high speed shaft of gearbox, it is achieved that electrical network
During Voltage Drop, the normal of electromagnetic coupler electromagnetic torque is applied and the black starting-up of this unit by converter, it is to avoid wind-powered electricity generation
Unit is connected with electrical network the pollution being likely to result in electrical network because of converter, it is achieved that Wind turbines and conventional power plant and network interface
On unification, be truly realized the target of Wind turbines " electrical network friendly ", may advantageously facilitate entering of this clean energy resource of wind-powered electricity generation
One step development；
(2) between gear-box and electrical excitation synchronous generator being contactless connection, what therefore gear-box was subject to comes from
The mechanical shock of electrical excitation synchronous generator pusher side is little, and service life is extended；
(3) by rotating speed and torque, the fast response time of Frequency Converter Control electromagnetic coupler；
(4) the axle rotating speed of electromagnetic coupler gear box side is consistently lower than the axle rotating speed of electrical excitation synchronous generator pusher side, flows through
The power of converter is only sub-fraction and the one way flow of Wind turbines output, therefore has only to capacity less
Single quadrant runs converter.
Accompanying drawing explanation
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
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention；
Fig. 2 is the structural representation of the self-styled closed form electromagnetic coupled arrangements for speed regulation of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The most double-fed with total power changing type Wind turbines compared with the Synchronous generator in conventional power plant grid-connected
Difference on interface, the also network interface of both Wind turbines is no longer synchronous generator on the surface, essentially,
Both Wind turbines are current-control type power supplys, and Synchronous generator is voltage-controlled type power supply.
The present invention proposes a kind of self-styled closed form electromagnetic coupled speed-regulating wind group of motors, and the also network interface of this Wind turbines is one
Platform electrical excitation synchronous generator, uses self-styled closed form electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation to synchronize to send out
Rotor axis of electric, makes power transmit to electrical excitation synchronous generator pusher side from gear box side, it is achieved that Wind turbines and conventional power plant
Unification on also network interface.
Below in conjunction with Figure of description, the self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention is described in detail.
As depicted in figs. 1 and 2, the self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention, this Wind turbines uses certainly
Enclosed type electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation synchronous generator rotor axle, and realize the biography of power
Pass.Self-styled closed form electromagnetic coupled arrangements for speed regulation are made up of electromagnetic coupler 4, converter 6 and magneto alternator 3, permanent magnetism
Synchronous generator 3 is for powering to converter 6.Electromagnetic coupler 4 is substantially a mouse cage asynchronous machine, with common mouse cage machine not
Same is that electromagnetic coupler has two rotating shafts, is connected with gear-box 2 and electrical excitation synchronous generator 5 and all rotates respectively, frequency conversion
Device 6 controls relative rotation speed and the electromagnetic torque of 4 two axles of electromagnetic coupler.
A piece axle of the high speed shaft of gear-box 2 and electromagnetic coupler 4 is connected composition front axle system, another of electromagnetic coupler 4
The armature spindle of root axle and electrical excitation synchronous generator 5 is connected composition rear axle mechanism, and axle system is 2 independent axle systems, permanent magnetism with
Step electromotor 3 coaxially realizes powering converter 6 with front axle system.Compared to the confession providing electric energy from electrical network power taking for converter 6
Electrically, during the power supply mode of the present invention has both achieved grid voltage sags, converter was to electromagnetic coupler electromagnetic torque just
Often apply and the black starting-up of this unit, turn avoid Wind turbines and be connected with electrical network the dirt that electrical network is likely to result in because of converter
Dye.
Being contactless connection between gear-box 2 and electrical excitation synchronous generator 5, what therefore gear-box 2 was subject to comes from
The mechanical shock of electrical excitation synchronous generator 5 side is little, and service life is extended；Electromagnetic coupler 4 is controlled by converter 6
Rotating speed and torque, fast response time；The axle rotating speed of electromagnetic coupler gear box side is consistently lower than electrical excitation synchronous generator pusher side
Axle rotating speed, the power flowing through converter is only sub-fraction and the one way flow of Wind turbines output, therefore only
Single quadrant that capacity is less is needed to run converter.
There are forward and backward 2 independent axle systems, such as Fig. 1 and Fig. 2 in the self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention
Shown in, initially enter start-up course；After start-up course completes, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to same
Phase network process；Capture wind energy to greatest extent after set grid-connection and stopping process.
Line voltage once falls and exceeds normal range, the control of self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Proceed to low voltage crossing control model, owing to converter is to be supplied by the magneto alternator coaxial with high speed shaft of gearbox
Electricity, falling of line voltage will not produce impact to the power supply of converter, in order to keep unit output watt current constant, frequency conversion
Device torque instruction value Tcmd_LVRTComputing formula be:
Tcmd_LVRT=kTcmd (1)
In formula, k is the perunit value of line voltage, TcmdWhen substantially running for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
The converter torque instruction value tried to achieve by wind wheel optimum mechanical characteristic, propeller pitch angle ask for phase normal with line voltage
With, use pi regulator to try to achieve according to wind speed round desired value and measured value；
After line voltage recovers, it is gradually reduced the exciting current of electrical excitation synchronous generator, makes the nothing that Wind turbines sends
Merit power recovers the reactive power value sent to grid voltage sags.
Self-styled closed form electromagnetism coupling is made by the regulation of electrical excitation synchronous generator exciting electric current during grid voltage sags
Close speed-regulating wind group of motors and send corresponding reactive power to realize support to line voltage, particularly seriously fall when line voltage
When falling, owing to electrical excitation synchronous generator has the strongest overload capacity, the operation encouraged by force by electrical excitation synchronous generator is made
Unit sends sufficiently large reactive power and effectively supports line voltage.After line voltage recovers, it is gradually reduced electrical excitation
The exciting current of synchronous generator, the reactive power making Wind turbines send is recovered to grid voltage sags Wind turbines and is sent
Reactive power value.
The start-up course of the self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention is with other Wind turbines the most not
With, can be divided into 3 stages:
First, in the first stage, by pitch control, making the rotating speed of wind wheel 1 be gradually increasing, current axis system rotating speed is sufficiently high
Time magneto alternator output voltage could meet inverter supply voltage request, now start converter and be set to rotating speed
Control model, by Frequency Converter Control electromagnetic coupler, makes rear axle mechanism ramp up to front axle system rotating speed；
It follows that entrance second stage, make forward and backward 2 axle systems as single stiff shafting by Frequency Converter Control
Synchronous rotary, until close to the tachometer value being set below electrical excitation synchronous generator synchronous speed:
In formula: nIFor front axle system rotating speed；nIIFor rear axle mechanism rotating speed；n1Synchronous speed for electrical excitation synchronous generator；F is electricity
Net frequency；P is the number of pole-pairs of electrical excitation synchronous generator.
Finally, pitch control keep front axle system rotating speed constant, and make rear axle mechanism by Frequency Converter Control electromagnetic coupler
Continue raising speed, until higher than electrical excitation synchronous generator synchronous speed Δ n (0 < Δ n < 5%).
nII=nI+Δn (3)
Startup stage complete after, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to simultaneous interconnecting process.Grid-connected
Switch board is according to the difference in magnitude measured between electrical excitation synchronous generator set end voltage and the line voltage obtained and phase contrast, dynamic
State regulation exciting current and converter output frequency, when these difference in magnitude and phase contrast be reduced to grid-connected require permissible value time,
Grid-connected switch automatic closing.At this moment, converter is switched to torque control model by rotating speed control mode.
After Wind turbines is grid-connected, need to regulate to adapting the output of electrical excitation synchronous generator with current wind regime
A certain power.In self-styled closed form electromagnetic coupled speed-regulating wind group of motors, power adjustments is by Frequency Converter Control electromagnetic coupled
The electromagnetic torque of device completes.Add the uninstall process impact to electrical network to slow down electrical excitation synchronous generator, need at power
Instruction arranges rational ramp function and carries out transition.
When wind speed less than rated wind speed time, running of wind generating set in underpower state, paddle pitch angle θ be maintained at 0 degree attached
Closely.In order to absorb wind energy as much as possible, Wind turbines uses the MPPT maximum power point tracking strategy not relying on measuring wind speed.Its
In, the electromagnetic torque of electromagnetic coupler is as the control variable of regulation wind speed round.According to current wind speed round, from preset
By the command value obtaining torque of tabling look-up in wind wheel optimum mechanical characteristic, transfer to the electromagnetism of Frequency Converter Control electromagnetic coupler
Torque.
When wind speed is higher than rated wind speed, running of wind generating set is in invariable power state.At this moment, the electromagnetism of electromagnetic coupler turns
Square maintains nominal torque value.Kept wind speed round near rated speed by pitch control.
When Wind turbines off-the-line normal from electrical network, the most progressively reduce the electromagnetic torque of electromagnetic coupler, unload de-electrifying encouraging
The load of magnetic-synchro electromotor, after reaching Light Condition, then disconnects the grid-connected switch in cutting-in control cabinet.Wind turbines off-grid
After, converter is switched to rotating speed control mode by torque control model.
Stopping process is divided into 2 stages.When first, pitch control making front axle system rotating speed be maintained at grid-connected switch separating brake
Rotating speed, and realizing electromagnetic braking by Frequency Converter Control electromagnetic coupler, to make rear axle mechanism be decelerated to equal with front axle system rotating speed；So
After, pitch control make the rotating speed of wind wheel be gradually reduced, when rotating speed is sufficiently high enable converter normal power supply time control electromagnetism
Forward and backward 2 the axle system synchronous rotaries of bonder, when rotating speed is too low, converter quits work, rear axle mechanism frictionally braking moment and
Front axle system controls to be finally completed the shutdown of Wind turbines by feathering.
The self-styled closed form electromagnetic coupled speed-regulating wind group of motors of the present invention, uses self-styled closed form electromagnetic coupled arrangements for speed regulation to couple
High speed shaft of gearbox and electrical excitation synchronous generator rotor axle, and realize the transmission of power, converter with and high speed shaft of gearbox
Coaxial magneto alternator is connected, it is achieved that during grid voltage sags, converter is to electromagnetic coupler electromagnetic torque just
Often apply and the black starting-up of this unit, it is to avoid Wind turbines is connected with electrical network the dirt being likely to result in electrical network because of converter
Dye, it is achieved that Wind turbines and conventional power plant unification on also network interface, is truly realized Wind turbines " electrical network friendly "
Target, may advantageously facilitate the further development of this clean energy resource of wind-powered electricity generation.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (6)
1. the low voltage traversing control method for self-styled closed form electromagnetic coupled speed-regulating wind group of motors, it is characterised in that adopt
With self-styled closed form electromagnetic coupled arrangements for speed regulation connection gear box high speed shaft and electrical excitation synchronous generator rotor axle, make power from tooth
Roller box lateral electrical excitation synchronous generator pusher side transmits, and network interface is described electrical excitation synchronous generator；
Described self-styled closed form electromagnetic coupled arrangements for speed regulation are made up of electromagnetic coupler, converter and magneto alternator, forever
Magnetic-synchro electromotor is for inverter supply；Described electromagnetic coupler has two rotating shafts, same with gear-box and electrical excitation respectively
Step generator electric also all rotates, the relative rotation speed of two rotating shafts of Frequency Converter Control electromagnetic coupler and electromagnetic torque；
A piece axle of the high speed shaft of described gear-box and described electromagnetic coupler is connected and constitutes front axle system, described electromagnetic coupler
The armature spindle of another root axle and described electrical excitation synchronous generator is connected composition rear axle mechanism, and axle system is 2 independent axles
System, described magneto alternator and front axle system coaxially realize described inverter supply；
Initially enter start-up course；After start-up course completes, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to the same period
And network process；Capture wind energy to greatest extent after set grid-connection and stopping process；
Line voltage once falls and exceeds normal range, and the control of self-styled closed form electromagnetic coupled speed-regulating wind group of motors just turns
Enter low voltage crossing control model, owing to converter is to be powered by the magneto alternator coaxial with high speed shaft of gearbox, electricity
Falling of net voltage will not produce impact to the power supply of converter, and in order to keep unit output watt current constant, converter turns
Square command value Tcmd_LVRTComputing formula be:
Tcmd_LVRT=kTcmd (1)
In formula, k is the perunit value of line voltage, TcmdBy wind when substantially running for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
The converter torque instruction value that the optimum mechanical characteristic of wheel is tried to achieve, propeller pitch angle identical when asking for normal with line voltage,
Pi regulator is used to try to achieve according to wind speed round desired value and measured value；
After line voltage recovers, it is gradually reduced the exciting current of electrical excitation synchronous generator, makes the idle merit that Wind turbines sends
Rate recovers the reactive power value sent to grid voltage sags.
A kind of low voltage crossing controlling party for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method, it is characterised in that described start-up course is divided into three phases:
First, in the first stage, by pitch control, make wind speed round be gradually increasing, when current axis system rotating speed is sufficiently high, permanent magnetism
The output voltage of synchronous generator meets inverter supply voltage request, now starts converter and is set to rotating speed control mode,
By Frequency Converter Control electromagnetic coupler, rear axle mechanism is made to ramp up to front axle system rotating speed；
It follows that entrance second stage, make axle system synchronous rotary by Frequency Converter Control, until close to being set below
The tachometer value of electrical excitation synchronous generator synchronous speed:
In formula: nIRotating speed for front axle system；nIIRotating speed for rear axle mechanism；n1Synchronous speed for electrical excitation synchronous generator；F is electricity
Net frequency；P is the number of pole-pairs of electrical excitation synchronous generator；
Finally, enter the phase III, pitch control keep front axle system rotating speed constant, and by Frequency Converter Control electromagnetic coupler
Rear axle mechanism is made to continue raising speed, until higher than electrical excitation synchronous generator synchronous speed Δ n；
nII=nI+Δn (3)。
A kind of low voltage crossing controlling party for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method, it is characterised in that startup stage complete after, electrical excitation synchronous generator puts into excitation, and Wind turbines proceeds to simultaneous interconnecting mistake
Journey, cutting-in control cabinet is according to the difference in magnitude measured between electric excitation generator set end voltage and the line voltage obtained and phase place
Difference, dynamically regulation exciting current and the frequency of converter output, allow when these difference in magnitude and phase contrast are reduced to grid-connected requirement
During value, grid-connected switch automatic closing, at this moment, converter is switched to torque control model by rotating speed control mode.
A kind of low voltage crossing controlling party for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method, it is characterised in that after Wind turbines is grid-connected, need to regulate the output of electrical excitation synchronous generator to current wind regime
The a certain power adapted, in self-styled closed form electromagnetic coupled speed-regulating wind group of motors, power adjustments is by Frequency Converter Control electricity
The electromagnetic torque of magnetic coupler completes, and adds the uninstall process impact to electrical network to slow down electrical excitation synchronous generator, needs
Ramp function is set in power instruction and carries out transition.
A kind of low voltage crossing controlling party for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method, it is characterised in that when wind speed is less than rated wind speed, running of wind generating set is maintained at underpower state, paddle pitch angle θ
Near 0 degree, Wind turbines uses the MPPT maximum power point tracking strategy not relying on measuring wind speed；Wherein, the electricity of electromagnetic coupler
Magnetic torque is as the control variable of regulation wind speed round；According to current wind speed round, from preset wind wheel optimum mechanical property
By the command value obtaining torque of tabling look-up in curve, transfer to the electromagnetic torque of Frequency Converter Control electromagnetic coupler；
When wind speed is higher than rated wind speed, running of wind generating set is in invariable power state；At this moment, the electromagnetic torque dimension of electromagnetic coupler
Hold in nominal torque value, pitch control keep wind speed round near rated speed；
When Wind turbines off-the-line normal from electrical network, the most progressively reduce the electromagnetic torque of electromagnetic coupler, shed electrical excitation same
The load of step electromotor, after reaching Light Condition, then disconnects the grid-connected switch in cutting-in control cabinet；After Wind turbines off-grid, become
Frequently device is switched to rotating speed control mode by torque control model.
A kind of low voltage crossing controlling party for self-styled closed form electromagnetic coupled speed-regulating wind group of motors
Method, it is characterised in that described stopping process is divided into 2 stages:
First, pitch control rotating speed when making front axle system rotating speed be maintained at grid-connected switch separating brake, and by Frequency Converter Control electricity
Magnetic coupler realizes electromagnetic braking, and to make rear axle mechanism be decelerated to equal with front axle system rotating speed；Then, pitch control turning of wind wheel is made
Speed is gradually reduced, when rotating speed is sufficiently high enable converter normal power supply time control forward and backward 2 the axle systems of electromagnetic coupler and synchronize rotation
Turn, when rotating speed is too low, converter quits work, rear axle mechanism frictionally braking moment and front axle system is finally completed by pitch control
The shutdown of Wind turbines.
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Cited By (3)
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| CN106602611A (en) * | 2017-02-20 | 2017-04-26 | 广东工业大学 | Single quadrant converter weak magnetic flux weakening control-based wind power system and operation method therefor |
| CN108661862A (en) * | 2018-05-11 | 2018-10-16 | 青岛大学 | A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method |
| CN108667366A (en) * | 2018-05-11 | 2018-10-16 | 青岛大学 | A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using active power mode of priority |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602611A (en) * | 2017-02-20 | 2017-04-26 | 广东工业大学 | Single quadrant converter weak magnetic flux weakening control-based wind power system and operation method therefor |
| CN106602611B (en) * | 2017-02-20 | 2023-05-05 | 广东工业大学 | Wind power system based on single-quadrant converter flux weakening control and operation method thereof |
| CN108661862A (en) * | 2018-05-11 | 2018-10-16 | 青岛大学 | A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method |
| CN108667366A (en) * | 2018-05-11 | 2018-10-16 | 青岛大学 | A kind of self-styled closed form electromagnetic coupling speed governing Wind turbines control method using active power mode of priority |
| CN108661862B (en) * | 2018-05-11 | 2019-07-09 | 青岛大学 | A kind of self-styled closed form electromagnetic coupling speed regulation Wind turbines control method |
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