CN110350554A - Wind storage system auxiliary power grid primary frequency modulation control method based on hybrid connected structure - Google Patents
Wind storage system auxiliary power grid primary frequency modulation control method based on hybrid connected structure 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- 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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The wind storage system auxiliary power grid primary frequency modulation control method based on hybrid connected structure that the invention discloses a kind of, the actual frequency including (1) acquisition electric system, calculates the frequency departure of current system；(2) wind storage system model is established, the switching time of serial frequency modulation task component and system is calculated；(3) according to the frequency departure of system, calculate separately the power output of current Wind turbines and energy-storage system, and Wind turbines and energy-storage system will be reached under task and carry out primary frequency modulation, after the time reaching switching time, become the control based on frequency modulation in parallel based on the series connection frequency modulation.Serial frequency modulation task component using genetic algorithm optimizing by being obtained to system modelling.The present invention can basically reach system frequency modulation demand power output in 0.3s, ensure that frequency modulation effect；Energy storage actuating quantity can be reduced by Optimal Control Strategy, extends energy storage and uses the time, improve frequency modulation economy.
Description
Technical field
The present invention relates to a kind of electric system frequency modulation control method more particularly to a kind of wind storage systems based on hybrid connected structure
Auxiliary power grid primary frequency modulation control method.
Background technique
Ended for the end of the year 2017, China's wind-powered electricity generation total installed capacity has reached 1.88 hundred million kilowatts, and China has become wind energy utilization big country.Wind
Electricity can aggravate power grid frequency modulation burden because of characteristics such as its own fluctuation, intermittences, after causing its grid-connected, will lead to electric power when serious
System crash, Wind turbines itself participate in the control method of frequency modulation mainly to sacrifice economy or reduce load capacity as generation
Valence, while being difficult to meet electric system primary frequency modulation rapidity demand in terms of response speed, energy-storage system has power density
The features such as height, fast response time, new mode is provided for electric system primary frequency modulation.
At present to the correlative study of wind storage frequency modulation mainly to improve wind-powered electricity generation fm capacity and frequency modulation instruct lower energy storage with
How wind-powered electricity generation, which contributes, is analyzed, and after considering frequency modulation instruction issuing, that how to distribute between energy-storage system and wind-powered electricity generation is asked
Topic, therefore, being one according to the energy distribution design wind storage system frequency modulation control strategy before energy-storage system and wind-powered electricity generation is worth visiting
The problem of rope.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes a kind of wind storage system auxiliary power grid one based on hybrid connected structure
Secondary frequency modulation control method realizes and reaches system frequency modulation demand in a very short period of time in traditional frequency modulation spare unit startup stage and go out
Power, and energy storage actuating quantity is reduced after conventional rack start completion, extend energy storage and uses the time.
Technical solution: the technical scheme adopted by the invention is that a kind of wind storage system auxiliary power grid one based on hybrid connected structure
Secondary frequency modulation control method, comprising the following steps:
(1) in the wind storage system with series and parallel mixed structure, the actual frequency of electric system is acquired, is calculated current
The frequency departure of system；
(2) wind storage system model is established, the switching time t of serial frequency modulation task component K and system is calculated0；
Wherein, the serial frequency modulation task component K and switching time t0Calculation method it is as follows:
(21) in system Wind turbines and energy-storage system model, and establish the string of Wind turbines and energy-storage system respectively
Capable and parallel model；
Wind turbines virtual frequency responds transmission function are as follows:
Wherein, kvdIt is virtual inertia response coefficient；kchangeIt is primary frequency modulation coefficient；Twind1It is the virtual inertia response time
Constant；Twind2It is variable pitch time constant；S indicates Laplace operator；GwIndicate that Wind turbines virtual frequency responds transmission function；
Energy-storage system transmission function are as follows:
Wherein, kvdIt is virtual inertia response coefficient；kchangeIt is primary frequency modulation coefficient；TEnergvThe energy storage power output response time is normal
Number；S indicates Laplace operator.
(22) wind storage system optimal control objective function is established；
Wind storage system optimal control objective function is as follows:
min[C1·Δfdev+C2·Δfsta+C3·S]
Wherein, C1For frequency minimum point penalty factor, C2For steady frequency value penalty factor, C3For frequency energy storage actuating quantity
Penalty factor, Δ fdevFor frequency minimum point, Δ fstaFor steady frequency value, S is energy-storage system cost during primary frequency modulation.
(23) optimal solution that wind storage system optimal control objective function is found using genetic algorithm, obtains optimal serial frequency modulation
Task component K and by switching time t0。
Preferably, the frequency minimum point penalty factor value 0.25, steady frequency value penalty factor value 0.25, frequency
Rate energy storage actuating quantity penalty factor value 0.5.
(24) system is emulated, traversal time variable, switching time t0Respective frequencies deviation maximum and steady frequency
Time value when value is minimum.
(3) based on serial frequency modulation control, according to the frequency departure of system, according to the serial frequency modulation obtained in step (2)
Task component K calculates separately the power output of Wind turbines and energy-storage system, and will reach Wind turbines and energy-storage system under task
Carry out primary frequency modulation；Reach switching time t0Afterwards, it is switched to based on parallel frequency modulation control, even serial frequency modulation task component is
1-K, parallel frequency modulation task component are K, calculate separately the power output of Wind turbines and energy-storage system, and will reach wind-powered electricity generation under task
Unit and energy-storage system carry out primary frequency modulation.Wherein, output calculation is divided into 0 < t < t0Period and t0The < t < T period,For
In 0 < t < t0Period wind stores up association system power output；For in t0< t < T period wind stores up association system power output；T is primary
Frequency modulation is held time；
WhereinIn 0 < t < t0Period power output are as follows:
In formula: Δ Pchu1For in 0 < t < t0Period, Optimal Control Strategy leeward storage association system are serially contributed situation；Δ
Pbin1For in 0 < t < t0Period, Optimal Control Strategy leeward storage association system are contributed situation parallel；ΔPwchu1For in 0 < t < t0
Period, serial Wind turbines power output under Optimal Control Strategy；ΔPechu1For in 0 < t < t0It is period, serial under Optimal Control Strategy
Energy-storage system power output；ΔPebin1For in 0 < t < t0Period, parallel energy-storage system power output under Optimal Control Strategy；ΔPwbin1For
0 < t < t0Period, parallel Wind turbines power output under Optimal Control Strategy；K1 is that wind stores up association system using parallel control strategy
The task distribution coefficient of energy-storage system when responding frequency modulation instruction；ΔPw+eAssociation system frequency modulation task amount is stored up for wind；ΔPvir-ine1For
In 0 < t < t0Period, Wind turbines virtual inertia regulation power；ΔPchange-β1For in 0 < t < t0Period, blower variable-pitch control
Regulation power.
In t0Power output in the < t < T period are as follows:
In formula: Δ Pchu2For in t0< t < T period, Optimal Control Strategy leeward storage association system are serially contributed situation；Δ
Pbin2For in t0< t < T period, Optimal Control Strategy leeward storage association system are contributed situation parallel；ΔPwchu2For in t0< t < T
Period, serial Wind turbines power output under Optimal Control Strategy；ΔPechu2For in t0It is the < t < T period, serial under Optimal Control Strategy
Energy-storage system power output；ΔPebin2For in t0< t < T period, parallel energy-storage system power output under Optimal Control Strategy；ΔPwbin2For
t0< t < T period, parallel Wind turbines power output under Optimal Control Strategy；K1Association system is stored up for wind to ring using parallel control strategy
When frequency modulation being answered to instruct, the task distribution coefficient of energy-storage system；ΔPw+eAssociation system frequency modulation task amount is stored up for wind；ΔPvir-ine2For
In the t0 < t < T period, Wind turbines virtual inertia regulation power；ΔPchange-β2For in t0< t < T period, blower variable-pitch control
Regulation power processed.
The utility model has the advantages that compared with prior art, the invention has the following advantages that (1) has comprehensively considered frequency modulation instruction issuing
The problem of how carrying out the distribution of reasonable energy between energy-storage system and wind-powered electricity generation afterwards, serial, the parallel control in conjunction with wind storage system
Mode can utilize energy storage rapidity in traditional frequency modulation spare unit startup stage, and system frequency modulation is basically reached in 0.3s to be needed
Power is found out, ensure that frequency modulation effect；(2) Accurate Model is carried out to wind storage system, obtains serial frequency modulation using genetic algorithm optimizing
Task component, emulation obtains switching time, to improve frequency modulation precision；(3) after conventional rack start completion, optimal control plan
Summary can reduce energy storage actuating quantity, extend energy storage and use the time, improve frequency modulation economy.
Detailed description of the invention
Fig. 1 is wind storage system primary frequency modulation control schematic diagram of the present invention；
Fig. 2 is energy storage system capacity configuration flow figure of the present invention；
Fig. 3 is energy storage power output comparison under different control strategies
Fig. 4 is that wind power output compares under different control strategies；
Fig. 5 is conventional rack power output comparison under different control strategies；
Fig. 6 is that control strategy of the present invention lowers yupin effect comparison diagram.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
Wind storage system auxiliary power grid primary frequency modulation control method of the present invention based on hybrid connected structure as shown in Figure 1,
The problem of reasonable energy distributes how is carried out between energy-storage system and wind-powered electricity generation after having comprehensively considered frequency modulation instruction issuing, proposes wind
Storage system serial parallel jointly controls mode, and a kind of wind that comprehensive utilization energy-storage system is parallel, Serial Control strategy proposes, which stores up, to be adjusted
Frequency Optimal Control Strategy.Specific frequency modulation control method the following steps are included:
(1) actual frequency for acquiring electric system, calculates the frequency departure of current system.
(2) wind storage system model is established, serial frequency modulation task component K and system is calculated and is switched to based on the serial frequency modulation
Time (switching time) t based on parallel frequency modulation0；The present invention establishes the wind storage system model with series and parallel mixed structure.
Wherein, serial frequency modulation task component K and switching time t0Calculation method it is as follows:
(21) in system Wind turbines and energy-storage system model, and establish the string of Wind turbines and energy-storage system respectively
Capable and parallel model；
(a) Wind turbines model
Current main-stream wind power generating set does not have inertial response ability, it is necessary to just can guarantee using certain technological means
The ability of blower participation frequency modulation.The control mode of mainstream is " virtual inertia control " at present and " pitch control ", the two are all
By changing the frequency response of the active output simulation tradition of Wind turbines in the power system.
" virtual inertia control " is simulated in synchronous generator in inertial response process, since generating unit speed cannot be mutated, when
Between delay so that mechanical output is kept constant, and uprushing for electromagnetic power declines rotor speed, rotation function is discharged, to drop
Low system frequency fall off rate.
" pitch control " is so that blower is reached maximum wind energy utilization by adjusting blade angle, and in different wind regime
A kind of control method of pair of wind-driven generator of the balance of lower control power and revolving speed.
Transmission function is specific as follows:
" virtual inertia control " transmission function:
In formula (1): kvdIt is virtual inertia response coefficient, general value 8；Twind1It is inertial response time constant, generally
Value 0.1s, s indicate Laplace operator；ΔPwind1Indicate that virtual inertia controls the changed power of lower system；Δ f indicates frequency
Deviation；
Pitch control transmission function:
In formula (2): kchangeIt is primary frequency modulation coefficient, general value 20；Twind2It is variable pitch time constant, general value
3s:s indicates Laplace operator；ΔPwind2Indicate the changed power of system under pitch control；Δ f indicates frequency departure；
Wind turbines virtual frequency responds transmission function:
In formula (3): kvdIt is virtual inertia response coefficient；kchangeIt is primary frequency modulation coefficient；Twind1It is that virtual inertia is rung
Answer time constant；Twind2It is variable pitch time constant；S indicates Laplace operator；GwIndicate that the response of Wind turbines virtual frequency passes
Delivery function；Primary frequency modulation coefficient kchangeIt is determined by system, general value is 20.
(b) energy-storage system models
Energy-storage system have response quickly, it is stable and can four quadrant running technical advantage, wind power plant configure
The energy-storage system of certain capacity can utmostly meet the frequency modulation demand of electric system.Since energy-storage system is configured in wind power plant
In, so energy-storage system inertial response coefficient, primary frequency modulation coefficient and Wind turbines are essentially identical.Therefore energy-storage system transmits letter
Exponential model are as follows:
In formula (4): TEnergyIt is the energy-storage system response time, general value 0.3s；kvdIt is virtual inertia response coefficient；
kchangeIt is primary frequency modulation coefficient；S indicates Laplace operator；GwIndicate that Wind turbines virtual frequency responds transmission function；Δ
PEnergyIndicate energy storage power adjustment；Δ f indicates frequency departure.
(c) the serial and concurrent model of Wind turbines and energy-storage system is established respectively.
(22) wind storage system optimal control objective function is established；
Consider energy-storage system cost and the constraint of serial, parallel frequency modulation effect, proposes wind storage system optimal control mode.
In the startup stage of traditional frequency modulation standby resources and Wind turbines, change paralleling tactic accounting according to different wind-powered electricity generation permeabilities,
Guarantee frequency modulation effect；After conventional rack and Wind turbines start completion, control mode is switched to from based on serial frequency modulation
Based on parallel frequency modulation, energy-storage system actuating quantity and energy-storage system life consumption are reduced.Thus the optimization control of wind storage system is proposed
Objective function processed are as follows:
min[C1·Δfdev+C2·Δfsta+C3·S] (5)
In formula (5): C1For frequency minimum point penalty factor, value 0.25；C2For steady frequency value penalty factor, value
0.25；C3For frequency energy storage actuating quantity penalty factor, value 0.5；ΔfdevFor frequency minimum point；ΔfstaFor steady frequency value；S
For energy-storage system cost during primary frequency modulation comprising when electric system primary frequency modulation, energy-storage system construction cost, energy storage system
System operating cost, energy-storage system maintenance cost, four part of primary frequency modulation purchases strategies.Its functional relation is as follows:
S=S1+S2+S3+S4 (6)
In formula (6): S1For wind storage system construction cost；S2For wind storage system operating cost；S3For energy-storage system maintenance at
This；S4The purchases strategies of primary frequency modulation are participated in for energy-storage system.
(23) optimal solution that wind storage system optimal control objective function is found using genetic algorithm, obtains optimal serial frequency modulation
Task component K.Using the serial distribution ratio K of wind storage system as variable, in the condition for establishing wind storage system optimal control objective function
Lower solution.Optimizing is carried out using genetic algorithm to serial distribution ratio K in this example, initial population quantity is set as 50, and solving model obtains
To the optimal solution of serial distribution ratio K.
(24) system is switched to time (switching time) t based on parallel frequency modulation based on the serial frequency modulation0Determination method
It is as follows:
A. t is inputted0Simulation result when=0 (emulation initial time), and to frequency departure maximum value and stable state frequency
Rate value is counted；
B. the frequency that initial setpoint frequency deviation maximum value, steady frequency value and simulated program are calculated is compared by program
Rate deviation maximum value, steady frequency value, and lesser frequency departure maximum value, steady frequency value will be saved；
C. judge whether to meet the primary frequency modulation period, the t if being unsatisfactory for0From a sampling period is added, continues to execute this and follow
Ring；
When D. obtaining frequency departure maximum value, steady frequency value minimum, t0Respective value.
Capacity configuration is carried out to energy-storage system under different control strategies, capacity configuration flow chart is as shown in Figure 2.Specifically
Process are as follows:
A.T=1 imports first frequcny modulation data；
B. force data P is gone out according to energy-storage system each moment1, consider each related constraint in energy-storage system actual motion, really
Determine energy-storage system rated power P0；
C. it is contributed in frequency modulated time section according to energy storage, energy-storage system processing curve is integrated on a timeline, is asked
The amount of trying to please Ef；
D. the constraint condition for considering energy-storage system SOC, determines energy-storage system rated capacity E0；
E.T=T+1.
(3) based on serial frequency modulation control, according to the frequency departure of system, according to the serial frequency modulation obtained in step (2)
Task component K calculates separately the power output of Wind turbines and energy-storage system, and will reach Wind turbines and energy-storage system under task
Carry out primary frequency modulation；Reach switching time t0, it is switched to based on parallel frequency modulation control, even parallel frequency modulation task component is equal to
K, serial frequency modulation task component are 1-K, calculate separately the power output of Wind turbines and energy-storage system, and will reach wind-powered electricity generation under task
Unit and energy-storage system carry out primary frequency modulation.
When wind storage system uses Optimal Control Strategy, wind storage association system gross capability is
In formula (7):For under Optimal Control Strategy in 0 < t < t0Period wind stores up association system power output；For
In t under Optimal Control Strategy0< t < T period wind stores up association system power output；T holds time for primary frequency modulation, takes 30s in text.In 0 < t < t0Period contributes shown in situation such as formula (8):
Wherein, Δ Pchu1For in 0 < t < t0Period, Optimal Control Strategy leeward storage association system are serially contributed situation；Δ
Pbin1For in 0 < t < t0Period, Optimal Control Strategy leeward storage association system are contributed situation parallel；ΔPwchu1For in 0 < t < t0
Period, serial Wind turbines are contributed Δ P under Optimal Control Strategyechu1For in 0 < t < t0It is period, serial under Optimal Control Strategy
Energy-storage system power output；ΔPebin1For in 0 < t < t0Period, parallel energy-storage system power output under Optimal Control Strategy；ΔPwbin1For
0 < t < t0Period, parallel Wind turbines power output under Optimal Control Strategy；ΔPw+eAssociation system frequency modulation task amount is stored up for wind, it is single
Position is MW；ΔPvir-ine1For in 0 < t < t0Period, Wind turbines virtual inertia regulation power, MW；ΔPchange-β1For in 0 < t
< t0Period, blower variable-pitch control to adjust power, MW；K1Parallel control strategy is individually used for wind storage association system to respond and adjust
When frequency instructs, the frequency modulation task distribution coefficient of energy-storage system, energy storage frequency modulation distribution coefficient K in this example1It is with frequency departure minimum
It is constraint condition the energy-storage system task distribution coefficient that determines, value 0.5.
Wherein, Δ Pvir-ine1、ΔPchange-β1Determination method are as follows:
Cp=Cp(β1+Δβ1) (11)
Wherein, m is blower quality, kg；V is rotation speed of fan, m/s；Δt1For virtual inertia response time, s；ρ is air
Density, value is 1.29kg/m under standard conditions3；R1For wind sweeping area radius, m；VmFor wind speed, m/s；CpFor wind energy utilization system
It counts, generally 20%~30%, takes 25% in this example；β1For in 0 < t < t0Period, blower under parallel control strategy paddle windward
Elongation；Δ β 1 is in 0 < t < t0Period, blower propeller pitch angle variable quantity windward under Serial Control.
In t0Shown in power output such as formula (12) in the < t < T period, in formula, Δ Pchu2For in t0When < t < T
Section, Optimal Control Strategy leeward storage association system are serially contributed situation；ΔPbin2For in t0< t < T period, Optimal Control Strategy
Leeward storage association system is contributed situation parallel；ΔPwchu2For in t0< t < T period, serial Wind turbines under Optimal Control Strategy
Power output；ΔPechu2For in t0< t < T period, serial energy-storage system power output under Optimal Control Strategy；ΔPebin2For in t0< t < T
Period, parallel energy-storage system power output under Optimal Control Strategy；ΔPwbin2For in t0It is the < t < T period, parallel under Optimal Control Strategy
Wind turbines power output；ΔPw+eAssociation system frequency modulation task amount, unit MW are stored up for wind；ΔPvir-ine2For in t0The < t < T period,
Wind turbines virtual inertia regulation power, MW；ΔPchange-β2For in t0< t < T period, blower variable-pitch control to adjust power,
MW。K1Association system, which is stored up, for wind uses parallel control strategy individually come when responding frequency modulation instruction, the frequency modulation task of energy-storage system is divided
Distribution coefficient, energy storage frequency modulation distribution coefficient K in this example1It is the energy-storage system task with the minimum constraint condition of frequency departure to determine
Distribution coefficient, value 0.5.
Wherein, Δ Pvir-ine2、ΔPchange-β2Determination method are as follows:
Cp=Cp(β2+Δβ2) (15)
In formula (13)-(15), m is blower quality, units/kg；V is rotation speed of fan, m/s；Δt1For virtual inertia response
Time, s；ρ is atmospheric density, and value is 1.29kg/m under standard conditions3；R1For wind sweeping area radius, m；VmFor wind speed, m/s；
CpFor power coefficient, generally 20%~30%, 25% is taken in this example；β 2 is in t0< t < T period, parallel control strategy
Under blower propeller pitch angle windward；Δ β 2 is t0< t < T period, blower propeller pitch angle variable quantity windward under Serial Control.
Based on Liaoning somewhere power grid real data, according to above-mentioned based on mixed in MATLAB/Simulink (R2014b)
The wind storage system primary frequency modulation control method for being coupled structure establishes electric system primary frequency modulation simulation model, the design parameter of model
As follows: load 1000MW, wind power plant rated power are 200MW, and load disturbance is 100MW (0.1p.u.).It is calculated serial
Frequency modulation task component K converges on 0.85, and the time t based on parallel frequency modulation is changed to based on serial frequency modulation0Value, which converges on disturbance, to be occurred
4.5s afterwards.
After Power System Disturbances occur, wind storage association system is specifically contributed, and to understanding, its frequency-modulating process has important meaning to situation
Justice；Meanwhile energy-storage system participates in the validity that power grid frequency modulation power output process is able to verify that strategy under different control strategies.Therefore,
Simulating, verifying is serial, the power output situation of parallel, energy-storage system under Optimal Control Strategy, wind power plant.
(1) energy-storage system is contributed
Energy-storage system, which participates in power grid frequency modulation power output process, under different control strategies has weight for the validity of authentication policy
Want meaning.Therefore, under same disturbance, energy-storage system is using frequency modulation power output parallel, under serial and Optimal Control Strategy
Situation is emulated, and simulation result is as shown in Figure 3.
In the starting of traditional frequency modulation standby resources, energy-storage system quick response frequency after disturbance occurs in electric system becomes
Change, power output is risen rapidly by 0, and taking around 0.3s can be to reaching power output maximum value.It is parallel to control under different control strategies
It produces power maximum value and reaches 0.032p.u., Serial Control power output can reach 0.023p.u., energy storage power output energy under optimal control
Enough reach 0.03p.u..Therefore, energy-storage system parallel control and optimal control the biggish energy of initial stage offer can occur in disturbance
Amount support, reduces frequency minimum point.
After traditional frequency modulation standby resources start completion, parallel control energy-storage system power output is stablized in 0.019p.u., serially
Energy-storage system power output essentially 0 is controlled, optimal control energy-storage system power output is stablized in 0.0037p.u..At this point, it is serial with it is excellent
Change and control lower energy-storage system power output very little, energy storage actuating quantity can be reduced, extends energy-storage system service life, while for next time
Frequency modulation retains allowance.
(2) output of wind electric field
Wind power plant studies its power output process in primary frequency modulation, for testing as important primary frequency modulation standby resources
Card is serial, parallel control strategy is of great significance.Therefore simulating, verifying is carried out to it, simulation result is as shown in Figure 4
The response of wind power plant virtual inertia is about in 0.1s by fan rotor under Wind turbines startup stage, each control strategy
Kinetic energy is discharged, and power system frequency is delayed quickly to fall, and control strategy influences this process smaller；
During pitch control, since wind-powered electricity generation undertakes task difference, the control of different control strategies in different control strategies
Effect processed starts to embody.In Serial Control, main standby resources of the wind-powered electricity generation as wind storage system, wind power output is maximum, base
Originally it can reach 0.02p.u.；In parallel control, since wind-powered electricity generation and energy-storage system respond frequency modulation instruction parallel, contribute smaller,
About 0.015p.u.；Under Optimal Control Strategy, Wind turbines power output is about 0.0197p.u..Therefore, optimal control and serial control
System can preferably utilize wind-powered electricity generation fm capacity, reduce energy storage actuating quantity.
(3) traditional frequency modulation resource power output
Main body of traditional frequency modulation standby resources as electric system frequency modulation has great influence to frequency modulation.Simulation analysis is not
It is specific as shown in Figure 5 with the influence that control strategy contributes to traditional frequency modulation standby resources.
Parallel control strategy has seriously tied up going out for traditional frequency modulation standby resources since energy-storage system is made parallel control
The fm capacity of traditional frequency modulation standby resources can not be fully utilized in power, cause traditional frequency modulation standby resources to be contributed and be about
0.067p.u.；Optimal Control Strategy and Serial Control all subtract to a certain extent after the spare unit start completion of traditional frequency modulation
Small energy-storage system power output, under optimization, Serial Control strategy, conventional rack power output is respectively 0.073p.u., 0.0736p.u..
Therefore, optimal control and Serial Control can preferably utilize the fm capacity of traditional frequency modulation unit.
In conclusion wind storage system uses optimal control mode, in traditional frequency modulation unit startup stage, energy-storage system can
Quickly power output promotes frequency minimum point；After conventional rack start completion, energy-storage system power output can be reduced, reduce its service life
Loss, improves the economy of primary frequency modulation.
(4) the frequency modulation effect under different control strategies
It is research energy-storage system using the frequency modulation effect under different control strategies, emulation has been carried out in Simulink and has been tested
Card, simulation result are as shown in Figure 6.
Under same Power System Disturbances, the control strategy that energy-storage system participates in electric system frequency modulation parallel is optimal, secondly
It is Optimal Control Strategy.Under different control strategies, the frequency minimum point and steady frequency deviation of electric system primary frequency modulation are such as
Shown in table 1.
The different control strategy lower frequency deviation statistics tables of table 1
| Control strategy | Frequency minimum point (Hz) | Steady frequency value (Hz) |
| Energy-storage system is serial | -0.442 | -0.241 |
| Energy-storage system is parallel | -0.387 | -0.187 |
| Optimal control | -0.401 | -0.205 |
Generally speaking, Optimal Control Strategy proposed by the present invention can be utilized in conventional rack and wind-powered electricity generation startup stage
Energy-storage system rapidity provides active support for electric system；After the completion of unit starting, unit tune is being utilized to greatest extent
Under the premise of frequency ability, energy storage actuating quantity is reduced, extends energy-storage system service life, while it is minimum utmostly to promote frequency
Point maintains power system frequency quality.
Claims (6)
1. a kind of wind storage system auxiliary power grid primary frequency modulation control method based on hybrid connected structure, which is characterized in that including following
Step:
(1) actual frequency for acquiring electric system, calculates the frequency departure of current system；
(2) wind storage system model is established, the switching time t of serial frequency modulation task component K and system is calculated0；
(3) based on serial frequency modulation control, according to the frequency departure of system, according to the serial frequency modulation task obtained in step (2)
Component K calculates separately the power output of Wind turbines and energy-storage system, and Wind turbines and energy-storage system progress will be reached under task
Primary frequency modulation；Reach switching time t0Afterwards, it is switched to based on parallel frequency modulation control, even serial frequency modulation task component is 1-K,
Parallel frequency modulation task component is K, calculates separately the power output of Wind turbines and energy-storage system, and will reach Wind turbines under task
Primary frequency modulation is carried out with energy-storage system.
2. the wind storage system auxiliary power grid primary frequency modulation control method according to claim 1 based on hybrid connected structure, special
Sign is, serial frequency modulation task component K described in step (2) and the switching time t of system0Calculation method it is as follows:
(21) in system Wind turbines and energy-storage system model, and establish respectively the serial of Wind turbines and energy-storage system and
Parallel model；
(22) wind storage system optimal control objective function is established；
(23) optimal solution that wind storage system optimal control objective function is found using genetic algorithm, obtains optimal serial frequency modulation task
Component K；
(24) system is emulated, traversal time variable, switching time t0Respective frequencies deviation is maximum and steady frequency value is minimum
When time value.
3. the wind storage system auxiliary power grid primary frequency modulation control method according to claim 2 based on hybrid connected structure, special
Sign is, models described in step (21) to Wind turbines and energy-storage system, and Wind turbines virtual frequency responds transmission function
Are as follows:
Wherein, kvdIt is virtual inertia response coefficient；kchangeIt is primary frequency modulation coefficient；Twind1It is virtual inertia responsive time constant；
Twind2It is variable pitch time constant；S indicates Laplace operator；GwIndicate that Wind turbines virtual frequency responds transmission function；
Energy-storage system transmission function are as follows:
Wherein, kvdIt is virtual inertia response coefficient；kchangeIt is primary frequency modulation coefficient；TEnergvEnergy storage power output responsive time constant；s
Indicate Laplace operator.
4. the wind storage system auxiliary power grid primary frequency modulation control method according to claim 2 based on hybrid connected structure, special
Sign is, it is as follows that wind storage system optimal control objective function is established described in step (22):
min[C1·Δfdev+C2·Δfsta+C3·S]
Wherein, C1For frequency minimum point penalty factor, C2For steady frequency value penalty factor, C3For the punishment of frequency energy storage actuating quantity
The factor, Δ fdevFor frequency minimum point, Δ fstaFor steady frequency value, S is energy-storage system cost during primary frequency modulation, for storage
The sum of energy system Construction cost, energy-storage system operating cost, energy-storage system maintenance cost, four part of primary frequency modulation purchases strategies.
5. the wind storage system auxiliary power grid primary frequency modulation control method according to claim 4 based on hybrid connected structure, special
Sign is: the frequency minimum point penalty factor value 0.25, steady frequency value penalty factor value 0.25, and frequency energy storage is dynamic
Work amount penalty factor value 0.5.
6. the wind storage system auxiliary power grid primary frequency modulation control method according to claim 1 based on hybrid connected structure, special
Sign is that the power output of the current Wind turbines of calculating described in step (3) and energy-storage system is divided into 0 < t < t0Period and t0
The power output of the wind storage association system of < t < T period,
In 0 < t < t0The power output of period wind storage association system are as follows:
Wherein,For in 0 < t < t0Period wind stores up the power output of association system, Δ Pchu1It stores up in association system serially to go out for wind
Power situation；ΔPbin1For in 0 < t < t0Period, wind store up the parallel power output situation of association system；ΔPwchu1For in 0 < t < t0When
The serial Wind turbines power output of section；ΔPechu1For in 0 < t < t0Period serial energy-storage system power output；ΔPebin1For in 0 < t < t0
Period parallel energy-storage system power output；ΔPwbin1For in 0 < t < t0Period parallel Wind turbines power output；K1Association system is stored up for wind
The task distribution coefficient of energy-storage system when being instructed using parallel control policy response frequency modulation；ΔPw+eAssociation system frequency modulation is stored up for wind
Task amount；ΔPvir-ine1For in 0 < t < t0Period Wind turbines virtual inertia regulation power；ΔPchange-β1For in 0 < t < t0
Period, blower variable-pitch control to adjust power.
In t0The power output of wind storage association system in the < t < T period are as follows:
Wherein,In t0< t < T period wind stores up the power output of association system, Δ Pchu2For in t0< t < T period wind Chu Lianhe
System is serially contributed situation；ΔPbin2For in t0< t < T period, wind storage association system are contributed situation parallel；ΔPwchu2For in t0
< t < T period serial Wind turbines power output；ΔPechu2For in t0< t < T period serial energy-storage system power output；ΔPebin2For
t0< t < T period parallel energy-storage system power output；ΔPwbin2For in t0< t < T period parallel Wind turbines power output；K1For wind Chu Lian
When collaboration system is using the instruction of parallel control policy response frequency modulation, the task distribution coefficient of energy-storage system；ΔPw+eJoint system is stored up for wind
System frequency modulation task amount；ΔPvir-ine2For in t0< t < T period, Wind turbines virtual inertia regulation power；ΔPchange-β2For
t0< t < T period, blower variable-pitch control to adjust power.
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