CN110429668A - Off-load Wind turbines speed-changing oar-changing coordinates and optimizes control method for frequency - Google Patents
Off-load Wind turbines speed-changing oar-changing coordinates and optimizes control method for frequency Download PDFInfo
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a kind of off-load Wind turbines speed-changing oar-changings to coordinate and optimize control method for frequency, include: Control of decreasing load: calculating Wind turbines off-load rate, to which wind speed is divided into multiple wind speed intervals, different Load Shedding Control Strategies is used to Wind turbines according to the partial results of different wind speed intervals and frequency modulation control；Frequency modulation control includes: that parameter optimization and frequency control；When parameter optimization, with the mechanical output of Wind turbines and the revolving speed of power calculation Wind turbines actually issued additional and the reference value of propeller pitch angle, to realize award setting；When frequency controls, using the power of the practical additional issue of the reference value and Wind turbines of the revolving speed of parameter optimization, Wind turbines output power is realized, while corresponding control result is also used to the Control of decreasing load stage.This method can make Wind turbines precisely determine off-load strategy under whole wind speed and optimize revolving speed and award setting, to obtain better frequency control effect.
Description
Technical field
The present invention relates to wind-power electricity generation active power controller technical fields more particularly to a kind of off-load Wind turbines speed change to become
Paddle coordinates and optimizes control method for frequency.
Background technique
In recent years, the permeability of wind-power electricity generation in the power system is continuously increased.Compared with conventional synchronization generating set, wind
Motor group is grid-connected by power electronic equipment, cannot respond to system frequency variation.The raising of wind-powered electricity generation specific gravity can be such that system inertia rings
It should be reduced with Primary frequency control ability, spare capacity needs increase.In addition, Wind turbines are normally operated in maximal power tracing
(MPPT) state, it is difficult to by power additional issue come the frequency of regulating system.In order to guarantee the safe and stable operation of electric system, have
The frequency that necessity excavates Wind turbines controls potentiality.
For this purpose, domestic and foreign scholars expand numerous studies, different frequency controls is proposed according to running of wind generating set state
Method processed.For having virtual inertia method, sagging control methods and combined inertia control methods without spare Wind turbines, control is former
Reason is the output power for increasing Wind turbines by the rotation function in release rotor.With the release of rotation function, turn
Speed is gradually reduced, Wind turbines be easy to appear because revolving speed it is too small caused by irregular operation.During restoring revolving speed, easily
There is the secondary decline of system frequency.Therefore, without spare Wind turbines, it only can be carried out of short duration frequency and support, it can not be real
The primary frequency modulation of participation system in meaning.
Currently, the method limit power output operation of abandonment shutdown is usually taken in wind power plant, however, Wind turbines can carry out suitably
Off-load to reserve a part of active frequency modulation as system spare.There are mainly two types of Wind turbines off-load methods, i.e. hypervelocity control
Preparation method and pitch control method.Hypervelocity control methods refer to that control Wind turbines revolving speed is more than optimized rotating speed to reduce having for Wind turbines
Function power output, is only applicable to low, middle wind speed scene.Pitch control method is to control the power output of Wind turbines by adjusting propeller pitch angle,
Suitable for whole wind speed, but compared to revolving speed, propeller pitch angle pace of change is slower, and caused mechanical wear is larger.If by two kinds
Control method cooperates, and the operation of Wind turbines off-load and primary frequency modulation control under full blast speed scene can be realized.It realizes
The key of the frequency control of Wind turbines is the output power and mechanical output of coordination Wind turbines, otherwise be easy to cause wind-powered electricity generation
The irregular operation of unit causes secondary frequency to decline；However, leading to frequency control effect currently without more effective scheme
Fruit is bad.
Summary of the invention
The object of the present invention is to provide a kind of off-load Wind turbines speed-changing oar-changings to coordinate and optimize control method for frequency, can obtain
Obtain better frequency control effect.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of off-load Wind turbines speed-changing oar-changing coordination optimization control method for frequency, comprising: Control of decreasing load and frequency modulation control
Two parts；
Control of decreasing load: Wind turbines off-load rate is calculated, so that wind speed is divided into multiple wind speed intervals, according to different wind speed
The partial results of section and frequency modulation control use different Load Shedding Control Strategies to Wind turbines；
Frequency modulation control includes: that parameter optimization and frequency control；When parameter optimization, with the mechanical output and reality of Wind turbines
The revolving speed of the power calculation Wind turbines of additional issue and the reference value of propeller pitch angle, to realize award setting；When frequency controls, benefit
With the power of the practical additional issue of the reference value and Wind turbines of the revolving speed of parameter optimization, the control of Wind turbines output power is realized
System, while corresponding control result is also used to the Control of decreasing load stage.
As seen from the above technical solution provided by the invention, Wind turbines can be made precisely to determine under whole wind speed
Off-load strategy simultaneously optimizes revolving speed and award setting, to obtain better frequency control effect.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is that a kind of off-load Wind turbines speed-changing oar-changing provided in an embodiment of the present invention coordinates and optimizes control method for frequency
Configuration diagram；
Fig. 2 is the schematic diagram that Wind turbines take different off-load strategies in different wind speed intervals in the embodiment of the present invention；
Fig. 3 is the relation schematic diagram of Wind turbines revolving speed and propeller pitch angle under different mechanical outputs in the embodiment of the present invention；
Fig. 4 is output power of the frequency control strategy in frequency control period of Wind turbines use in the embodiment of the present invention
Schematic diagram；
Fig. 5 is frequency controller parameter K, ω in the embodiment of the present inventionrefIllustrate with the relationship of rotation function release time
Figure；
Fig. 6 is that the frequency response comparison of the Wind turbines that emulate frequency modulation at different wind speeds in the embodiment of the present invention is shown
It is intended to.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of off-load Wind turbines speed-changing oar-changing coordination optimization control method for frequency, relevant control
Framework processed is as shown in Figure 1, it specifically includes that Control of decreasing load and frequency modulation control two parts；Wherein:
Control of decreasing load: Wind turbines off-load rate is calculated, so that wind speed is divided into multiple wind speed intervals, according to different wind speed
The partial results of section and frequency modulation control use different Load Shedding Control Strategies to Wind turbines；
Frequency modulation control includes: that parameter optimization and frequency control；When parameter optimization, with the mechanical output and reality of Wind turbines
The revolving speed of the power calculation Wind turbines of additional issue and the reference value of propeller pitch angle, to realize award setting；When frequency controls, benefit
With the power of the practical additional issue of the reference value and Wind turbines of the revolving speed of parameter optimization, the control of Wind turbines output power is realized
System, while corresponding control result is also used to the Control of decreasing load stage.
The above method can make Wind turbines precisely determine off-load strategy under whole wind speed and optimize revolving speed and propeller pitch angle
Control, to obtain better frequency control effect.
In order to make it easy to understand, being described in detail below for above-mentioned two parts content.
One, Control of decreasing load.
The determination of Load Shedding Control Strategy depends not only on wind speed, also related to the size of off-load rate.Wind turbines are calculated to subtract
The formula of load rate are as follows:
Wherein, PrefFor the active power reference value that wind power plant provides, PoptIt is active for maximum obtainable under current wind speed
Power, PreserveFor the non-firm power of Wind turbines.
It is divided into three sections, section I [v for wind speed is ascending according to off-load ratein_cut,v1], II [v of section1,v2] and area
Between III [v2,vout_cut]；Wherein, vin_cutIt is incision wind speed, vout_cutIt is cut-out wind speed, v1Size determined by off-load rate, v2's
Size is then determined by the parameter of Wind turbines.
Since rotor speed changes, fast hypervelocity control is preferential to be used, and is still unable to satisfy off-load demand when revolving speed reaches maximum value
When enable pitch control again.Therefore, Wind turbines need to take different off-load strategies at different wind speeds.The wind turbine of Interval I
Group is using hypervelocity control methods off-load, and simultaneously using hypervelocity control methods and pitch control method off-load, section III uses variable pitch in section II
Control methods off-load.After determining off-load rate, v is found out using spline method1, off-load rate is bigger, v1It is smaller.
For example, Wind turbines are illustrated in figure 2 in the embodiment of the present invention and take different off-loads in different wind speed intervals
The schematic diagram of strategy.As shown by curve 1, wind speed v of the Wind turbines in Interval IaUnder, 0 ° of propeller pitch angle holding is constant, only passes through
Increase speed and reach off-load demand, and revolving speed does not exceed revolving speed maximum value ωmax.Wind turbines are in A0Point Maximum Power Output,
Corresponding rotational speed omegaopt, A1And A2The mechanical output of point is equal in magnitude, unlike, A1Take deceleration off-load, and A2Hypervelocity is taken to subtract
It carries.When wind speed fluctuates, A1Point can be gradually deviated from, and A2Point can be gradually stable.Therefore, in order to which aerogenerator unit safe is stablized
Operation, Ying Jinliang avoid revolving speed from being less than ωoptAnd hypervelocity method is selected to realize off-load.
As shown in curve 2 and curve 3, Wind turbines v under the wind speed in section IIb、vcUnder, revolving speed increases in off-load
To ωmax, need just to be able to satisfy off-load requirement using hypervelocity control methods and pitch control method simultaneously.
As shown in curve 4, wind speed v of the Wind turbines in section IIIdUnder, stabilization of speed is in ω when normal operationmax, paddle
When elongation β is 0 °, running of wind generating set is in Z0Point has been unable to reach control effect using hypervelocity method, can only be by increasing pitch
Realize off-load in angle.As shown in dashed line in figure 2, it is assumed that wind speed vdConstant, propeller pitch angle β increases to β1, Wind turbines will be in Z1Point subtracts
Carrying row.
Two, frequency modulation control.
1, parameter optimization.
As shown in Figure 1, Wind turbines switch to hopping pattern, and receive from wind after frequency variation is more than dead zone
The additional issue power instruction Δ P of electric fieldref.Firstly, according to the increment Delta P of Wind turbines output power during frequency modulationrefIt calculates practical
The power Δ P of additional issueact:
Then, according to the mechanical output P of Wind turbinesmWith Δ PactThe revolving speed and propeller pitch angle of Wind turbines is calculated
Reference value, i.e. ωrefAnd βref；
Finally, by ωrefAnd βrefAs the input quantity of award setting unit, to realize award setting；Meanwhile
ωrefTo input frequency control module also to control the additional issue of output power.
After Wind turbines receive frequency modulation additional issue instruction, Wind turbines are by control revolving speed and propeller pitch angle to increase machinery
Power realizes the release of non-firm power.Fig. 3 is Wind turbines revolving speed in the embodiment of the present invention and propeller pitch angle in different mechanical outputs
Under relation schematic diagram.If Wind turbines initial launch is in point D0, the mechanical output P of Wind turbinesmFor 0.3p.u.If Δ Pact=
0.1p.u, D0It will move closer to Pm=0.4p.u curve finds a preferably operating point (ω on curveref,βref) make wind-powered electricity generation
Unit energy stable operation is in this.In view of being compared in practical application with revolving speed, the movement speed of Wind turbines propeller pitch angle is slower,
And mechanical wear when changing is larger.Therefore, when selecting operating point, it should guarantee propeller pitch angle variable quantity minimum as far as possible to improve and adjust
Frequency rate reduces mechanical abrasion.
In the embodiment of the present invention, the target of parameter optimization is that expectation obtains the smallest propeller pitch angle regulated quantity, objective function
Are as follows:
F(ωref,βref)=min | β0-βref|
Wherein, ωrefFor the reference value of revolving speed, βrefFor the reference value of propeller pitch angle, β0For the initial value of propeller pitch angle.
According in Control of decreasing load to the analysis of Wind turbines stable operation it is found that operating point needs to meet:
When revolving speed is less than ωoptWhen, it is unsatisfactory for above formula, running of wind generating set is in range of instability, such as the dotted line in Fig. 3；Revolving speed
Greater than ωoptWhen, meet above formula, running of wind generating set is in stable region, such as the solid line in Fig. 3.Meanwhile it also needing to ωref, βref, turn
The regulating time Δ t of speedωIt is constrained.Above-mentioned bound for objective function is shown below:
Wherein, CpFor wind energy utilization, λ is tip speed ratio, and v is wind speed, parameter kp≤1.Objective function is linear function,
It is nonlinear programming problem with nonlinear inequality and equality constraints condition.
Selection of the embodiment of the present invention solves the function using method of Lagrange multipliers.Firstly, to objective function into
Row Lagrange transformation obtains unconstrained optimization problem, such as following formula:
Wherein, L (x, γ, η) is that Lagrange transformation obtains unconstrained optimization function, and F (x) is objective function, x=
(ωref,βref), h (x) is equality constraint, γiIt is corresponding equality constraint coefficient, g (x) is inequality constraints condition, ηi
It is corresponding inequality constraints coefficient.In addition, feasible solution also needs to meet Karush-Kuhn-Tucher (KKT) condition, it is as follows
Shown in formula.
Wherein,Be L (x, γ, η) to the local derviation of x, after meeting KKT condition, can be obtained inequality about
Optimization solution (ω under the conditions of beamref,βref).It, can using method of Lagrange multipliers as the optimization algorithm of parameter optimization module
Guarantee that gained optimum results are global optimum.
2, frequency controls
Compared to synchronous unit, Wind turbines have the characteristics that quickly to change output power.If control Wind turbines are being adjusted
Frequency initial stage largely issues additional, and is beneficial to reduce system frequency change rate.In the embodiment of the present invention, turning for parameter optimization is utilized
Speed reference value and Wind turbines practical additional issue power, calculate frequency modulation during Wind turbines output power increment, realize
Wind turbines output power, the increment of Wind turbines output power is also used to the Control of decreasing load stage during the frequency modulation；
The formula of the increment of Wind turbines output power during calculating frequency modulation are as follows:
Wherein, Δ PregFor the increment of Wind turbines output power during frequency modulation, PRef | t=0For initial output power, K be than
Example coefficient, ω are the revolving speed of Wind turbines, ω0For the initial speed of Wind turbines, t is frequency modulation moment, PmFor the machine of Wind turbines
Tool power Pm, ωrefReference value for the revolving speed calculated when parameter optimization.
Fig. 4 is output power of the frequency control strategy in frequency control period of Wind turbines use in the embodiment of the present invention
Schematic diagram.In figure, βa, βb, βcRespectively different pitch angle numbers.Wind turbines export relatively high power at frequency modulation initial stage, favorably
In reduction system frequency change rate and maximum frequency deviation.Meanwhile the variation of revolving speed and propeller pitch angle is gradually increased mechanical output
Until equal with output power.At the end of primary frequency modulation, Wind turbines are stablized in new operating point.Compared to the operation before frequency modulation
State, Wind turbines output power increase Δ Pact。
Parameter K determines the size of frequency modulation initial stage output power, the reference value ω for the revolving speed that when parameter optimization calculatesrefCertainly
Determine the variation of mechanical output；The two parameters and Wind turbines initial operating state and the time T for discharging rotation functionrPhase
It closes, relational expression are as follows:
Wherein, HwFor the inertia constant of Wind turbines, PeFor the electromagnetic power of Wind turbines, all parameters are mark in formula
Value.
Set TrSize, can be obtained parameter K and ωrefRelation curve.The PMSG that the embodiment of the present invention is analyzed
Wind turbines parameter is as shown in table 1, when wind speed is 10m/s, frequency controller parameter K, ωrefWith rotation function release time
Relation schematic diagram as shown in Fig. 5 in the embodiment of the present invention.T in figurecFor the time for discharging rotation function.
1 PMSG Wind turbines parameter of table
Fig. 6 is that the frequency response comparison of the Wind turbines that emulate frequency modulation at different wind speeds in the embodiment of the present invention is shown
It is intended to.Compare the simulation result discovery under three wind speed, the Wind turbines energy quick release spinning reserve energy of Interval I is to reduce
Frequency change rate and maximum frequency deviation, the Wind turbines in section III can discharge more non-firm power to reduce frequency departure,
Section II then has both the advantages of Interval I and III.Institute of embodiment of the present invention promoting or transferring frequency control strategy can make Wind turbines stable operation
And mechanical wear is reduced, and reduce system frequency change rate and maximum frequency deviation, avoid the secondary landing of frequency.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment can
The mode of necessary general hardware platform can also be added to realize by software by software realization.Based on this understanding,
The technical solution of above-described embodiment can be embodied in the form of software products, which can store non-easy at one
In the property lost storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (8)
1. a kind of off-load Wind turbines speed-changing oar-changing coordinates and optimizes control method for frequency characterized by comprising Control of decreasing load with
Frequency modulation control two parts；
Control of decreasing load: Wind turbines off-load rate is calculated, so that wind speed is divided into multiple wind speed intervals, according to different wind speed intervals
And the partial results of frequency modulation control use different Load Shedding Control Strategies to Wind turbines；
Frequency modulation control includes: that parameter optimization and frequency control；When parameter optimization, with the mechanical output of Wind turbines and practical additional issue
Power calculation Wind turbines revolving speed and propeller pitch angle reference value, to realize award setting；When frequency controls, ginseng is utilized
The power of the practical additional issue of the reference value and Wind turbines for the revolving speed that number optimization calculates, realizes Wind turbines output power,
Corresponding control result is also used to the Control of decreasing load stage simultaneously.
2. a kind of off-load Wind turbines speed-changing oar-changing according to claim 1 coordinates and optimizes control method for frequency, feature
It is, calculates the formula of Wind turbines off-load rate are as follows:
Wherein, PrefFor the active power reference value that wind power plant provides, PoptFor under current wind speed it is obtainable maximum active power,
PreserveFor the non-firm power of Wind turbines.
3. a kind of off-load Wind turbines speed-changing oar-changing according to claim 1 or 2 coordinates and optimizes control method for frequency, special
Sign is, is divided into three sections, section I [v for wind speed is ascending according to off-load ratein_cut,v1], II [v of section1,v2] and area
Between III [v2,vout_cut]；Wherein, vin_cutIt is incision wind speed, vout_cutIt is cut-out wind speed, v1Size determined by off-load rate, v2's
Size is then determined by the parameter of Wind turbines.
4. a kind of off-load Wind turbines speed-changing oar-changing according to claim 3 coordinates and optimizes control method for frequency, feature
It is, section I is using hypervelocity control methods, and simultaneously using hypervelocity control methods and pitch control method, section III uses variable pitch in section II
Control methods.
5. a kind of off-load Wind turbines speed-changing oar-changing according to claim 1 coordinates and optimizes control method for frequency, feature
It is, the reference of the mechanical output with Wind turbines and the revolving speed and propeller pitch angle of the power calculation Wind turbines actually issued additional
Value, to realize that award setting includes:
According to the increment Delta P of Wind turbines output power during frequency modulationrefCalculate the power Δ P actually issued additionalact:
Then, according to the mechanical output P of Wind turbinesmWith Δ PactThe reference of the revolving speed and propeller pitch angle of Wind turbines is calculated
Value, i.e. ωrefAnd βref；
By ωrefAnd βrefAs the input quantity of award setting unit, to realize award setting.
6. a kind of off-load Wind turbines speed-changing oar-changing coordinates and optimizes control method for frequency according to claim 1 or 5, special
Sign is that the target of parameter optimization is that expectation obtains the smallest propeller pitch angle regulated quantity, objective function are as follows:
F(ωref,βref)=min | β0-βref|
Wherein, ωrefFor the reference value of revolving speed, βrefFor the reference value of propeller pitch angle, β0For the initial value of propeller pitch angle.
7. a kind of off-load Wind turbines speed-changing oar-changing according to claim 1 coordinates and optimizes control method for frequency, feature
It is, using the power of the practical additional issue of the reference value and Wind turbines of the revolving speed of parameter optimization, calculates wind during frequency modulation
The increment of motor group output power realizes Wind turbines output power, Wind turbines output power during the frequency modulation
Increment is also used to the Control of decreasing load stage；
The formula of the increment of Wind turbines output power during calculating frequency modulation are as follows:
Wherein, Δ PregFor the increment of Wind turbines output power during frequency modulation, PRef | t=0For initial output power, K is ratio system
Number, ω are the revolving speed of Wind turbines, ω0For the initial speed of Wind turbines, t is frequency modulation moment, PmFor the mechanical work of Wind turbines
Rate Pm, ωrefReference value for the revolving speed calculated when parameter optimization.
8. a kind of off-load Wind turbines speed-changing oar-changing according to claim 7 coordinates and optimizes control method for frequency, feature
It is,
Parameter K determines the size of frequency modulation initial stage output power, the reference value ω for the revolving speed that when parameter optimization calculatesrefIt decides
The variation of mechanical output；The two parameters and Wind turbines initial operating state and the time T for discharging rotation functionrCorrelation is closed
It is formula are as follows:
Wherein, HwFor the inertia constant of Wind turbines, PeFor the electromagnetic power of Wind turbines.
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| CN112117768A (en) * | 2020-03-26 | 2020-12-22 | 广西大学 | Wind generating set subsection frequency modulation control method based on power tracking curve switching |
| CN112615391A (en) * | 2020-12-08 | 2021-04-06 | 国网四川省电力公司电力科学研究院 | Wind turbine generator primary frequency modulation control method and device based on load shedding coefficient |
| CN113471989A (en) * | 2021-07-02 | 2021-10-01 | 东北电力大学 | Intelligent micro-grid secondary frequency control method based on wolf optimization method |
| CN116365544A (en) * | 2023-03-16 | 2023-06-30 | 南京工程学院 | Wind power primary frequency modulation improved overspeed load shedding control method considering turbulence characteristics |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117768A (en) * | 2020-03-26 | 2020-12-22 | 广西大学 | Wind generating set subsection frequency modulation control method based on power tracking curve switching |
| CN112615391A (en) * | 2020-12-08 | 2021-04-06 | 国网四川省电力公司电力科学研究院 | Wind turbine generator primary frequency modulation control method and device based on load shedding coefficient |
| CN112615391B (en) * | 2020-12-08 | 2022-10-21 | 国网四川省电力公司电力科学研究院 | Wind turbine generator primary frequency modulation control method and device based on load shedding coefficient |
| CN113471989A (en) * | 2021-07-02 | 2021-10-01 | 东北电力大学 | Intelligent micro-grid secondary frequency control method based on wolf optimization method |
| CN116365544A (en) * | 2023-03-16 | 2023-06-30 | 南京工程学院 | Wind power primary frequency modulation improved overspeed load shedding control method considering turbulence characteristics |
| CN116365544B (en) * | 2023-03-16 | 2024-07-12 | 南京工程学院 | Wind power primary frequency modulation improved overspeed load shedding control method considering turbulence characteristics |
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