CN104917201B - Double-fed blower fan active power and frequency control device and method that simulation inertia is combined with hypervelocity - Google Patents
Double-fed blower fan active power and frequency control device and method that simulation inertia is combined with hypervelocity Download PDFInfo
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Abstract
The invention discloses a kind of simulate double-fed blower fan active power and frequency control device and the method that inertia is combined with hypervelocity, including：The frequency departure detection module that is sequentially connected, adjust module, time delay module and speed protection module every straight module, regulated quantity；Incoming frequency separate-blas estimation module obtains the frequency departure signal of now electrical network respectively for real-time grid frequency signal and frequency setting value；Through adjusting module into regulated quantity every straight module, regulated quantity module of adjusting obtains rotational speed regulation amount according to frequency departure signal to frequency departure signal；Rotating speed protection module could put into frequency modulation after making DFIG units that frequency modulation, and time delay certain hour are exited under rotating speed abnormal conditions again.Beneficial effect of the present invention：Extensive double-fed fan motor is grid-connected to replace conventional synchronous electromotor that system inertia will be caused to reduce so as to deteriorate system frequency transient stability, and collective frequency controller proposed by the present invention can effectively improve this problem.
Description
Technical field
The present invention relates to double-fed wind power generator technical field, more particularly to a kind of simulation inertia controls mutually to tie with hypervelocity method
The active frequency synthesis controller of double-fed blower fan of conjunction and method.
Background technology
Wind-power electricity generation as most ripe at present, most scale development condition generation of electricity by new energy mode, in power system
In especially the abundant region permeability of wind energy resources be continuously increased.Wind-power electricity generation scale is developed rapidly and brings huge environment
Benefit and economic benefit, but also new challenge is brought to the safe and stable operation of power system.
Double-fed wind power generator (doubly fed induction generation, DFIG) is with the high change of generating efficiency
The characteristics of frequency device capacity is little, has become one of main force's type of current Large Scale Wind Farm Integration.Its power electronics inverter is being realized
While maximal power tracing, also so that no longer there is coupled relation between rotor speed and mains frequency, it is impossible to as traditional same
Step electromotor equally discharges or stores the change of kinetic energy damping system frequency by rotor, i.e., Wind turbines rotor kinetic energy is by frequency conversion
Device is completely " hiding ".From in terms of total system angle, the rotary inertia of Wind turbines is zero, and the wind energy turbine set based on DFIG units is extensive
Access the frequency dynamic response characteristic of the obvious attenuation systems of meeting.And which operates in maximal power tracing (Maximum Power
Point Tracking, MPPT) pattern when efficiency cannot participate in the primary frequency modulation of system up to maximizing.
In order to reduce impact of the extensive DFIG units access to mains frequency stability, common improved method has：
1st, the kinetic energy stored using rotor carries out short time frequency modulation, adds active frequency control link to simulate synchronous generator
The frequency response characteristic of machine, makes speed-changing draught fan have certain virtual inertia；
2nd, generator efficiency is reduced by the method at hypervelocity or feather angle so as to leave the once tune that surplus energy participates in system
Frequently；
3rd, the method that wind energy turbine set participates in system frequency adjustment is assisted also to obtain very using energy-storage systems such as flywheel, set of cells
The concern of many researcheres.
DFIG unit set inertias are big, rotational speed regulation wider range, therefore said method can be simulated in theory and compare synchronous motor
Bigger " simulated inertia "；But the kinetic energy that DFIG units can be provided when rotating speed is relatively low is limited, after exiting frequency modulation, rotating speed is extensive
Multiple the output of process power reduces causing the secondary of mains frequency to fall, and in frequency-modulating process, operating point deviates maximal power tracing point
This adverse effect will also be deepened.Also, perfect wind energy turbine set frequency regulation capability, it is desirable to which Wind turbines are provided simultaneously with controllable
Inertial response and Primary frequency control ability, after off-load, primary frequency modulation is more few with the integrated control method that inertia control is organically combined
See.
The content of the invention
In order to solve problem above, the invention provides the active frequency of double-fed blower fan that a kind of simulation inertia is combined with hypervelocity
Rate controller and method.The method can make double-fed blower fan effectively support the used of system using rotor kinetic energy and off-load spare capacity
Property frequency modulation, reduce static frequency error, and avoid the system frequency secondary pulse that excessive frequency modulation may bring.
To achieve these goals, the present invention is adopted the following technical scheme that：
The double-fed blower fan active power and frequency control device that a kind of simulation inertia is combined with hypervelocity, including：The frequency being sequentially connected
Separate-blas estimation module, adjust module, time delay module and speed protection module every straight module, regulated quantity；
Real-time grid frequency signal fmeaWith frequency setting value frefIncoming frequency separate-blas estimation module obtains now electricity respectively
Frequency departure signal delta f of net；Frequency departure signal delta f through adjusting module into regulated quantity every straight module, adjust by regulated quantity
Module obtains rotational speed regulation amount according to frequency departure signal delta f；Rotating speed protection module makes DFIG units under rotating speed abnormal conditions
Frequency modulation is put into again after exiting frequency modulation, and time delay certain hour could.
A kind of control method of the double-fed blower fan active power and frequency control device that simulation inertia is combined with hypervelocity, including following step
Suddenly：
(1) determine double-fed wind power generator capture most strong wind power, and obtain double-fed wind power generator peak power with
Track curvilinear equation；
(2) during mains frequency normal work, Wind turbine operates in hypervelocity off-load state, improves rotor by hypervelocity method and deposits
Storage kinetic energy simultaneously obtains frequency modulation spare capacity；
(3) when system frequency deviation is detected more than controlling dead error, according to frequency departure size, rotor speed, hypervelocity
Off-load amount determines rotational speed regulation amount, and double-fed Wind turbine determines given active power of output according to rotational speed regulation amount and rotor speed
Reference value.
(4) when participating in system primary frequency modulation to double-fed Wind turbine, static difference coefficient is adjusted so that its have with
The same droop characteristic of conventional electric generators；
In the step (1), the most strong wind power of the capture of wind-driven generator is：
Wherein, PoptTo give the peak power of wind speed apparatus for lower wind machine capture, ρ is atmospheric density, CoptIt is and tip speed ratio
λopt, the related optimum wind power conversion efficiency coefficient of pitch angle beta, A is the inswept area of blower fan, UwFor wind speed, wtoptRotate for blower fan
Angular velocity, R are blade radius.
In the step (1), double-fed wind power generator maximum power tracking curve equation is specially：
In formula：
In formula：PoptFor the peak power of wind energy conversion system capture, koptBe determined by wind energy conversion system aerodynamic power with
Track coefficient, ρ is atmospheric density, CPoptOptimal power conversion coefficient, λoptFor optimum tip speed ratio, R is blade radius, ωrTo turn
Rotor speed, p be power generator electrode logarithm, G be gear-box carry-over factor, wtFor blower fan angular velocity of rotation.
Rotational speed regulation amount in the step (3) is：
Wherein, koptkdePower tracking coefficient respectively before and after off-load, d% represent off-load amount size, wrFor rotor speed,
Δ f be frequency departure amount size, fbfaBound is adjusted for mains frequency under normal circumstances, mains frequency declines under normal circumstances
0.5Hz is not allowed more than.
Beneficial effects of the present invention：
1st, extensive double-fed fan motor is grid-connected replaces conventional synchronous electromotor that system inertia will be caused to reduce so as to deteriorate system
Frequency transient stability, collective frequency controller proposed by the present invention can effectively improve this problem.
2nd, the comprehensive frequency modulation control method that simulation inertia control proposed by the present invention and hypervelocity method combine, with frequency modulation work(
The characteristics of energy is perfect, frequency-modulating process is steady, can effectively reduce frequency fluctuation amplitude and static frequency mistake that load disturbance causes
Difference.The controlled quentity controlled variable setting method further researched and proposed makes DFIG units participate in frequency-modulating process with as conventional electric generators
Droop characteristic.
3rd, after simulation analysis demonstrate DFIG units using rotational speed regulation ICU, system response is obtained
It is effectively improved.In participating in frequency-modulating process, rotating speed is maintained in safety zone, overcomes general kinetic energy control method frequency modulated time short
And easily cause the problem of machine of cutting.
Description of the drawings
Fig. 1 is typical simulation inertia integrated control method schematic diagram；
Fig. 2 is the sagging frequency characteristics control curve of the conventional generator with speed regulator；
Fig. 3 is DFIG off-load schematic diagrams under same wind conditions；
Fig. 4 is DFIG rotational speed regulation Comprehensive Control schematic diagram of the present invention；
When Fig. 5 is sudden load increase, the relation in DFIG participation frequency-modulating process between output, capture power and rotating speed is shown
It is intended to；
Fig. 6 is moderating process and changed power schematic diagram in accelerator；
Fig. 7 is analogue system example structural representation of the present invention；
Fig. 8 for embodiment of the present invention load L2 uprush 100MW when system frequency response comparison diagram；
Fig. 9 is embodiment of the present invention DFIG unit active power of output change curve；
Figure 10 is embodiment of the present invention DFIG generating unit speed change curve；
Figure 11 is to be input into mechanical output change curve during embodiment of the present invention DFIG unit participates in frequency-modulating process.
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
1st, DF I G unit set inertias frequency modulation and primary frequency modulation specificity analysises
1.1 rotor kinetic energy control methods
Wind-driven generator stores kinetic energy in the rotor：
In formula：J is mechanical rotation inertia, and ω is rotating speed.The rotational speed regulation scope of DFIG units generally synchronous rotational speed ±
0.2pu, participates in system frequency modulation by control rotor speed change release or absorption rotor kinetic energy, rotor before and after rotating speed change
Kinetic energy increment is：
In formula：Kinetic energy change amounts of the Δ E for rotor, ω1And ω2Respectively rotor speed before and after frequency modulation.By turning in DFIG
Increase an additional active power reference value being associated with system frequency change on the active power reference value of sub- side converter,
Speed-changing draught fan can be made using the kinetic energy active response system frequency change of storage, the frequency response for simulating conventional generator is special
Property.In following Fig. 1, dotted line inframe is typical simulation inertial frequency controller, and complete additional active frequency controller also includes turning
The secondary control modules such as fast protection module, rotating speed recovery module and conventional power unit Coordination module.
In Fig. 1, active power obtained by additional frequency controller is：
Ignore system loss, write as and can obtain similar to conventional generator equation of rotor motion form：
In formula：HsFor the inertia constant of conventional generator, KfFor proportionality coefficient, 1/R is sagging coefficient, and Δ f is system frequency
Variable quantity, PMMachine torque, P are input into for wind energy conversion systemETo export electromagnetic torque, D is load damped coefficient.From (1) formula, when
KfThe rotary inertia similar with conventional electric generators can be produced during more than zero, 1/R can increase damped coefficient when being more than zero and improve frequency
Dynamic response performance.
When system frequency is undergone mutation, the spy that inertia control has given full play to the active output of DFIG energy quick regulations is simulated
Property, the kinetic energy stored using rotor is enable Wind turbine to provide of short duration active support, improves the transient stability of system frequency
Property.But due to without active reserve capacity, therefore system cannot be continuously fm role is provided, rotation speed of fan will when being less than threshold values
Frequency modulation is exited into rotating speed Restoration stage.
1.2 Control of decreasing load methods
Conventional generator can change air intake valve aperture by speed regulator to adjust input mechanical output so that generating electricity
Machine participates in primary frequency modulation, and the conventional generator with speed regulator has droop characteristic, and its incremental delivered power is as shown in Figure 2 and frequency
The proportional variation relation of deviation, i.e.,：
Δ P=-KG*Δf
In formula, KGIt is the unit power regulation of unit, KGInverse be exactly conventional power generation usage unit static difference coefficient, i.e.,：
In order to the sagging frequency modulation characteristic of identical, DFIG units should have when being in maximal power tracing operational mode
Certain spare capacity, otherwise its can only play a role when frequency is raised, and frequency reduce when can not play a role.Obtain standby
There are two kinds with the feasible method of capacity：A kind of method is hypervelocity method so as to which speed of service during normal work is more than peak power
Optimized rotating speed during tracking needs to control rotating speed when increasing output again to reduce making blower fan so as to reducing the efficiency of Wind turbine
Can the more mechanical outputs of capture；Another kind of method is to increase the propeller pitch angle of blower fan to reduce capture wind power.It is illustrated in fig. 3 shown below
For Control of decreasing load schematic diagram：
Hypervelocity method is based on a.c.frequency converting control technology, and control speed is fast more than award setting speed, and which is mainly by maximum
Rotating speed is limited certain the blind area of control, therefore is applied to rated wind speed region below.The actuator of feather method is mechanical part,
The relatively slow DeGrain for causing frequency modulation is participated in using the Wind turbines of direct award setting of propeller pitch angle governing speed, and
And pitch-controlled system frequently action aggravation mechanical loss, increased the cost of overhaul and easily shorten service life of fan.Therefore condition
In the case of permission, the preferential method using hypervelocity obtains spare capacity.
2nd, DFIG generating unit speeds adjust Comprehensive Control
Wind energy turbine set possesses inertial response ability and can reduce the transient stability that system frequency rate of change improves system frequency, tool
There is standby active power increase/reduce the primary frequency modulation that input mechanical output participates in system, therefore perfect wind-powered electricity generation field frequency
Rate adjusts strategy and should be provided simultaneously with both abilities.As it was noted above, blower fan obtain spare capacity can by hypervelocity method and
Feather method, the method combined with simulation inertia phase by feather method are limited substantially by feather method self-defect.Hypervelocity method master
To be limited by velocity limits, according to wind-powered electricity generation department operating statistic, the probability of blower fan output overrate 80% is general
Less than the 10% of run time, thus hypervelocity control can be suitable in most cases.Rotating speed is improved also deposits blower fan
The more kinetic energy that can be used for frequency modulation of storage, therefore the present invention uses the method combined with simulation inertia control by hypervelocity method.
2.1 rotational speed regulation Comprehensive Control principles and frequency modulation dynamic process analysis
The most strong wind power of the capture of wind-driven generator is represented by：
In formula：PoptTo give the peak power of wind speed apparatus for lower wind machine capture, ρ is atmospheric density, CoptTurn for optimum wind energy
Change rate, λoptFor optimum tip speed ratio, β is propeller pitch angle, and A is the inswept area of blower fan, UwFor wind speed.Tip speed ratio λopt=
wtoptR/Uw, wtoptFor blower fan angular velocity of rotation, R is blade radius.
Due to the more difficult accurate detection of wind speed in actual motion, it is impossible to directly give corresponding optimum speed, therefore one
As directly do not take speed closed loop control, but realized to rotating speed with this with electromagnetic power balance by control input mechanical output
Indirect control.Under conditions of not considering loss, DFIG units are with current rotor rotational speed omegarUniquely determine PoptAs rotor-side
Active reference value P in active power controller systemref, adjust rotating speed and can easily and directly adjust output.Can by (2) formula
Obtaining maximum power tracking curve equation is：
In formula：
In formula：koptIt is the constant determined by wind energy conversion system aerodynamic, is generally given by producer, p is power generator electrode pair
Number, G are gear-box carry-over factor.
It is illustrated in figure 4 the theory diagram of controller：When mains frequency is normal, Wind turbine operates in hypervelocity off-load state,
When system frequency deviation is detected more than controlling dead error, adjusted according to current rotating speed and off-load situation output speed by (5) formula
Section amount Δ w, DFIG units are according to (wr+ Δ w) determines given output reference value.
Specifically include：The frequency departure detection module that is sequentially connected, adjust module, time delay module every straight module, regulated quantity
And speed protection module；
By detecting that mains frequency obtains real-time grid frequency signal fmeaInput controller, frequency signal is whole with frequency
Definite value frefComparison obtains frequency departure signal delta f of now electrical network；Regulated quantity adjust module according to frequency departure signal delta f with
And other parameters obtain rotational speed regulation amount size delta ω by following (5) formula；Double-fed Wind turbine is according to (wr+ Δ ω) determine it is new
Optimal power reference value PrefRotor side converter is given, double-fed blower fan output responsive electricity grid frequency fluctuation is finally reached
Purpose.Wherein：The impact of Power System Steady-state frequency error can be eliminated every straight link, when making deviation signal Δ f be more than controlling dead error
Controller ability action.After rotating speed protection module makes DFIG units that frequency modulation, and time delay certain hour are exited under rotating speed abnormal conditions
Frequency modulation is put into again could.
It is different from general simulation inertia control method, process rotating speed is adjusted herein to be constantly in safety zone, rotating speed is protected
Shield module only just action in case of a fault.Time delay module can prevent frequent switching in rotating speed recovery process.
Fig. 5 show DFIG units frequency modulation overall process power-rotation speed change schematic diagram when system loading is uprushed.
Before frequency modulation, DFIG unit operations are in hypervelocity off-load point 2, and when system frequency occurs larger fluctuation, electromagnetic power is by putting 2
Increase Δ P immediatelymTo point 3, now mechanical output is captured more than blower fan due to exporting electromagnetic power, rotor will be deceleration release dynamic
Energy；Before rotating speed is reduced to optimized rotating speed as seen from the figure, the mechanical output of blower fan capture will be with wrReducing increases Δ P by point 2wTo point
4, and electromagnetic power is then with wrReduce and a little 4 (being the fm capacity limit when point 4 is overlapped with MPPT points), final Δ P are reduced to by point 3w
=Δ PmWhen generator power reach new poised state, output maintains to increase Δ PwParticipate in primary frequency modulation.Ordinary circumstance
Under, Δ f is gradually reduced Δ w under secondary system fm role and also declines therewith, under Wind turbine itself control and regulation effect,
Slow Accelerating running is returned off-load operating point by rotor, accelerator is longer with respect to the time for moderating process, it is to avoid blower fan
Rotating speed recovery process causes output to reduce impacting the frequency of system.
DFIG participates in the whole process of frequency modulation, and output becomes along 2 → 4 → 2 along 2 → 3 → 4 → 2 changes, input power
Change, this process had both released the power of rotor kinetic energy sharing system mutation, also take full advantage of spare capacity and participate in system once
Frequency modulation.Frequency-modulating process when system frequency is uprushed is with said process conversely, understanding that rotor first accelerates to slow down afterwards to finally return that in the same manner
Equilibrium point.Changed power curve is illustrated in fig. 6 shown below：
In Fig. 6, area S1For the kinetic energy of rotor moderating process release, area S2For rotor accelerator absorb kinetic energy, plus
When fast area is equal to retardation area, operating point finally returns that starting point, i.e.,：
In sum, after taking rotational speed regulation integrated control strategy, DFIG units are according to system frequency fluctuation size release
Rotor kinetic energy and increase capture mechanical output, effectively support that system frequency is stable, so as to improve after wind energy turbine set access electrical network
Reduce the adverse effect of system inertia.As DFIG stores more kinetic energy and leaves certain standby appearance by improving rotating speed
Do not exist after amount, whole frequency-modulating process rotor speed are located in safety zone, therefore blower fan participates in frequency modulation and cut machine risk.DFIG machines
Group participates in secondary frequencies adjustment and also needs rational static frequency characteristic of adjusting out so as to sagging as conventional electric generators
Characteristic.
2.2 Comprehensive Control specificity analysises and control
Static difference coefficient size stably has material impact to maintaining system frequency.Static difference coefficient is less, generates electricity
Unit fm capacity is stronger, and in being more easy to ensure frequency stable, but actual motion, too small static difference coefficient may cause system
Between interior each generating set, sharing of load is unreasonable, make set speed adjustment system cannot stable operation, therefore DFIG units participate in system
Primary frequency modulation need to rationally be adjusted to its difference coefficient.If power tracking curvilinear equation is after hypervelocity off-load：
In formula：kdeFor off-load power tracking coefficient.Off-load amount size, maximal power tracing point and hypervelocity point are represented with d%
Power relation is：
P2=(1-d%) P1 (3)
Then sagging coefficient is represented by：
For conventional generator δ-value is generally 3%-5%, the frequency of power system is fallen amplitude and is not typically allowed more than
0.5Hz, if therefore Wind turbines possess the static frequency characteristic similar to usual Turbo-generator Set, the off-load level of unit should
For 20%-33%, can pass through to adjust power tracking curve.In order that DFIG units are with as electromotor shown in Fig. 2
Vertical characteristic, then need to control the position of stable operating point 4 in frequency-modulating process.The position of point 4 is difficult directly control, can be by control
The power of uprushing of point 3 is directly proportional to Δ f the position at further control point 4.Off-load point 2 is operated in before DFIG unit frequency modulation, frequency is disturbed
After dynamic, Wind turbines output is changed into：
In the case where rotational speed regulation scope is little, it is believed that wr＞ ＞ Δ w, so：
I.e.：
In formula：ΔPmaxFor the power Δ P that uprushes in Fig. 5mThe ultimate value that can be reached, referred to as limit frequency modulation power, the limit
Frequency modulation power should not be too big in order to avoid rotating speed ingoing power unstable region.As seen from Figure 5, limit frequency modulation power is peak power
Power difference between rotating speed identical point (point 5) on trace point (point 1) and off-load power curve.Maximal power tracing point and super
Fast off-load point power is respectively：
2 points of rotation speed relation can be obtained by 2 points of power relation of (3) formula：
5 rotating speeds of point are substituted into off-load power tracking curvilinear equation to obtain：
So：
By Δ PmaxCan obtain after (4) formula of substitution abbreviation：
Wherein, koptkdePower tracking coefficient respectively before and after off-load, d% represent off-load amount size, wrFor rotor speed,
Δ f be frequency departure amount size, fbfaBound is adjusted for mains frequency under normal circumstances, mains frequency declines under normal circumstances
0.5Hz is not allowed more than.
Can be seen that by (4) (5) two formula, power tracking coefficient and frequency-tuning range are setting parameter, can be according to static tune
Difference coefficient adjustment.Δ f ∝ Δs w ∝ Δ P in frequency-tuning range, so as to DFIG units participate in system primary frequency modulation with tradition
The same droop characteristic of electromotor.
3rd, simulation analysis
The present invention is based on classical four machines, two district system, and example as shown in Figure 7 has been built in MATLAB/Simulink
System, wherein G1, G3 and G4 are respectively thermal power plant of the capacity for 400MW and 1000MW, and at No. 2 nodes, G2 is wind energy turbine set (wind-powered electricity generation
By 200 1.5MW double-fed wind power generator group into), wind energy turbine set rated capacity be overall system capacity 14.2%.Load L1 and
L2 is that constant burden with power is respectively 500MW and 1000MW.Choose each power plant rated capacity be its power base value, rotating speed
Rated speed of the base value for DFIG units.
Frequency response simulation analysis when 3.1 system loadings are mutated
Wind speed is 9m/s, and tuning range is ± 0.5Hz, and DFIG units are in 11% off-load state by the method for hypervelocity,
Load L2 was uprushed to 1100MW by 1000MW at the 10.0s moment, caused system frequency to reduce.Fig. 8 is taken respectively for DFIG units
Without additional frequency control, typically simulate inertia control, three kinds of control modes of rotational speed regulation Comprehensive Control when, system after load disturbance
Frequency fluctuation curve comparison situation, by can be seen that in figure：
In the case that DFIG units are uncontrolled, frequency declines that most fast and the range of decrease is larger, and fluctuation amplitude is beyond requiring；
Take general simulation inertia control method make Wind turbine response system frequency fluctuation, restrained effectively frequency
Fluctuation maximum amplitude.But the kinetic energy that can be provided as rotation speed of fan is relatively low is limited, after about 10s, Wind turbine exits frequency modulation
Secondary pulse is caused to system frequency, also will be aggravated therewith as wind energy turbine set scale increases impact effect；
Rotational speed regulation integrated control strategy, frequency departure is taken to exceed frequency modulation control dead band (± 0.2Hz) frequency modulation control afterwards
Have an effect.The frequency modulation initial stage effectively inhibits system frequency to fluctuate by rotor release kinetic energy, and frequency minima is carried by 49.38Hz
49.66Hz is upgraded to, the change amplitude of frequency reduces 45.1%, FREQUENCY CONTROL can be existed to system inertia supporting function substantially
In claimed range.Wind turbine not only falls initial stage oscillation suppression in system frequency, the long-time during system primary frequency modulation
The imbalance power of frequency modulation electromotor is shared, compared with without additional control, static frequency deviation reduces about 0.05Hz.Due to super
Fast method makes electromotor store more kinetic energy and operating point to be gradually close to maximal power tracing point, therefore DFIG units are whole
The secondary pulse that general simulation inertia control method is brought is avoided, is improved frequency retrieval process.
3.2 active power Output Characteristics
During Fig. 9 is glitch perturbation process, output situation of change of the DFIG units under three kinds of control modes.
When DFIG units are controlled without additional frequency, Wind turbine operates in maximal power point tracking control model, and its output keeps
0.225pu changes without response to system frequency.Using general simulation inertia control method, can be using storage kinetic energy response system
When frequency changes therefore frequency modulation starts, output increases, but in 20s, frequency control link is forced because rotating speed is too low
Excision, this also results in the secondary pulse of system frequency.Using rotational speed regulation integrated control method, when normal output by
0.225 is reduced to 0.2pu (off-load 11%), and frequency modulation starts that rear output response system frequency change is quick to be increased, with turning
Speed and frequency departure reduction are gradually reduced but less speed is relatively slower, and final output power is changed into power before off-load, standby
Capacity is played a role completely, therefore DFIG units can effectively participate in the long-term frequency modulation of system.
3.3 rotation speed change process analyses
Figure 10 is that DFIG units participate in rotating speed situation of change in frequency-modulating process.DFIG units control situation without additional frequency
Under, running of wind generating set changes without response to system frequency in maximal power point tracking control model, unit, and its rotating speed is according only to wind
The change of speed is adjusted, and keeps optimum tip speed ratio, to follow the trail of maximal wind-energy.In the case of using general simulation inertia control,
The kinetic energy of rotating part storage is limited and does not have controllable energy source, if frequency modulation is excessively, final because rotating speed is too low
Frequency control link is cut off by force, causes the secondary fluctuation of system frequency.It is during using rotational speed regulation integrated control method, stable to transport
During row, rotating speed increases to 1.02pu by 0.85 and stores more kinetic energy and is conducive to frequency modulation, final rotating speed level off to optimized rotating speed and not
It is lower rotation speed limit value therefore and nothing cuts machine risk.
3.4 input mechanical output specificity analysises
Figure 11 is to be input into mechanical output situation of change during DFIG units participate in frequency-modulating process.It can be seen that DFIG
Unit is reducing entering until exiting frequency modulation using the wind power that general simulation inertia control method is captured in frequency-modulating process always
Enter rotating speed Restoration stage, a kinetic energy part for rotor losses is used to make up mechanical output damage for system frequency modulation another part
Lose, this factor reduce further the Wind turbine Frequency Adjustable time.Method of the DFIG units using rotational speed regulation Comprehensive Control,
Wind power is captured in frequency-modulating process to be increased amplitude peak always and is being about 0.05pu.
After simulation analysis demonstrate DFIG units using rotational speed regulation integrated control strategy, frequency characteristic is obtained effectively
Improve.Participate in frequency-modulating process in rotating speed maintain in safety zone, overcome general kinetic energy control method frequency modulated time it is short and
Easily cause the problem of machine of cutting.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to invention protection domain
Restriction, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not required to
The various modifications made by creative work is paid or deformation are still within protection scope of the present invention.
Claims (5)
1. a kind of control method of the double-fed blower fan active power and frequency control device that simulation inertia is combined with hypervelocity, is characterized in that,
Described double-fed blower fan active power and frequency control device includes：The frequency departure detection module that is sequentially connected, every straight module, regulation
Measure adjust module, time delay module and rotating speed protection module；
Real-time grid frequency signal and frequency setting value respectively incoming frequency separate-blas estimation module obtain now electrical network frequency it is inclined
Difference signal；Through adjusting module into regulated quantity every straight module, regulated quantity adjusts module according to frequency departure to frequency departure signal
Signal obtains rotational speed regulation amount；Rotating speed protection module makes double-fed blower fan that frequency modulation is exited under rotating speed abnormal conditions, and time delay is certain
Frequency modulation is put into again after time could；
Described control method is comprised the following steps：
(1) determine the most strong wind power of double-fed blower fan capture, and obtain double-fed blower fan maximum power tracking curve equation；
(2) during mains frequency normal work, double-fed fan operation, in hypervelocity off-load state, improves rotor storage by the method that exceeds the speed limit dynamic
Frequency modulation spare capacity can simultaneously be obtained；
(3) when system frequency deviation is detected more than controlling dead error, according to frequency departure size, rotor speed, hypervelocity off-load
Amount determines rotational speed regulation amount, and double-fed blower fan determines the given output of double-fed blower fan according to rotational speed regulation amount and rotor speed
Reference value；
(4) when participating in system primary frequency modulation to double-fed blower fan, static difference coefficient is adjusted so which has and conventional electric power generation
The same droop characteristic of machine.
2. the control of the double-fed blower fan active power and frequency control device that a kind of simulation inertia as claimed in claim 1 is combined with hypervelocity
Method, is characterized in that, in the step (1), the most strong wind power of the capture of double-fed blower fan is：
Wherein, PoptTo give the peak power of double-fed blower fan capture under wind speed, ρ is atmospheric density, CoptIt is and tip speed ratio
λopt, the related optimum wind power conversion efficiency coefficient of pitch angle beta, A is the inswept area of double-fed blower fan, UwFor wind speed, wtoptFor double-fed
Blower fan angular velocity of rotation, R are blade radius.
3. the control of the double-fed blower fan active power and frequency control device that a kind of simulation inertia as claimed in claim 1 is combined with hypervelocity
Method, is characterized in that, in the step (1), double-fed blower fan maximum power tracking curve equation is specially：
In formula：
In formula：PoptFor the peak power of double-fed blower fan capture, koptBe determined by double-fed blower air kinetics power with
Track coefficient, ρ is atmospheric density, CPoptOptimal power conversion coefficient, λoptFor optimum tip speed ratio, R is blade radius, ωrTo turn
Rotor speed, p be double-fed blower fan number of pole-pairs, G be gear-box carry-over factor, wtFor double-fed blower fan angular velocity of rotation.
4. the control of the double-fed blower fan active power and frequency control device that a kind of simulation inertia as claimed in claim 1 is combined with hypervelocity
Method, is characterized in that, the rotational speed regulation amount in the step (3) is：
Wherein, kopt、kdeThe respectively forward and backward power tracking coefficient of off-load, d% represent off-load amount size, wrFor rotor speed, Δ f
For frequency departure amount size, fb、faRespectively mains frequency adjusts upper and lower limit under normal circumstances.
5. the control of the double-fed blower fan active power and frequency control device that a kind of simulation inertia as claimed in claim 1 is combined with hypervelocity
Method, is characterized in that, in order that double-fed blower fan is with the droop characteristic as conventional electric generators in the step (4), need
It is directly proportional to frequency departure amount Δ f by the uprush power of uprushing of power points of control, and then the position of control stable operating point.
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