CN106340892A - Control device of energy storage system used for inhibiting wind power output power - Google Patents
Control device of energy storage system used for inhibiting wind power output power Download PDFInfo
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- CN106340892A CN106340892A CN201610890458.8A CN201610890458A CN106340892A CN 106340892 A CN106340892 A CN 106340892A CN 201610890458 A CN201610890458 A CN 201610890458A CN 106340892 A CN106340892 A CN 106340892A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 105
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 238000001914 filtration Methods 0.000 claims abstract description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 61
- 229910052744 lithium Inorganic materials 0.000 claims description 61
- 230000000087 stabilizing effect Effects 0.000 claims description 38
- 238000009826 distribution Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 abstract description 12
- 230000005764 inhibitory process Effects 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000004153 renaturation Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 241001125929 Trisopterus luscus Species 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
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Classifications
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H02J3/386—
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a control device of an energy storage system used for inhibiting wind power output power. Under the condition that grid-connected reference power is given, by use of a fuzzy control principle, according to a deviation degree between the wind power output power and a grid-connected reference value, a low-pass filtering time constant is selected, the calculation is simple, and it is maintained that the output power follows a scheduling target value; power of a hybrid energy storage system is distributed by use of a control strategy of a supercapacitor priority work principle; through connecting a slide mean value algorithm with the input side of the hybrid energy storage system, peaks and reciprocating wind power fluctuations are inhibited, through performing secondary inhibition on an inhibition target by use of a slide mean value principle, the peaks and the reciprocating wind power fluctuations are inhibited, and the life of the energy storage system is prolonged; and the energy storage system performs control through converting a power quantity into magnitude of currents, rapid and accurate control of power throughput can be realized, and the dynamic performance of the system is improved.
Description
Technical field
The present invention relates to a kind of control device of the energy-storage system for stabilizing wind power output power.
Background technology
Wind energy has technology maturation, advantage of lower cost, cleanliness without any pollution and the advantage such as environmentally friendly, and becoming can be again
The representative of raw clean energy resource.But because wind-powered electricity generation is limited by its natural conditions, there is undulatory property, intermittence and can not accurately predict
Feature, will certainly cause many adverse effects to Operation of Electric Systems as large-scale wind power is grid-connected, or even can cause extensive
Serious accident, thus restricting the development of Wind Power Generation Industry.Energy-storage system relays as Operation of Electric Systems process and " adopts and send out
The 6th link after the big link of transmission ＆ distribution use " five, can effectively improve wind-powered electricity generation scale so that power system becomes " soft ",
Largely improve power system safety and stability, economy and motility.
Affected by energy storage mechnism, lithium battery energy density is high, and power density, service life cycle are low；Ultracapacitor work(
Rate density, cycle life are high, and energy density is low.Mixed energy storage system combines the advantage of two kinds of energy-accumulating mediums, improves energy storage
The overall performance of system, becomes the effective ways stabilizing wind power fluctuation.For giving full play to the excellent of dissimilar energy-accumulating medium
Gesture, how effective control strategy reasonable in design becomes the key that mixed energy storage system is applied.Existing scheme one is with slip
Meansigma methodss principle carries out power distribution to mixed energy storage system, but it is difficult to choose suitable time constant in engineering application, and
And the precise control to output cannot be accomplished.Existing scheme two is the residual capacity divided rank according to battery, smooth
Adjust low-pass filtering time constant, extend the battery energy storage life-span, but cannot ensure that grid-connected power maintains desired value.Existing scheme
Three is with fuzzy theory, energy-storage system power to be allocated, and realizes the reasonable distribution of mixed energy storage system power, extends storage
Energy lifetime of system, but calculate cumbersome, time-consuming.The battery that power minor swing causes excessively regulates and controls to affect its life-span.And this
Strategy is that the direct control to power leads to dynamic performance poor.
Content of the invention
It is an object of the invention to provide a kind of control device of the energy-storage system for stabilizing wind power output power, can
While energy-storage system is protected, maintain grid-connected power about grid-connected desired value.
For solving the above problems, the present invention provides a kind of control of the energy-storage system for stabilizing wind power output power to set
Standby, including wind energy turbine set and mixed energy storage system, wherein,
Described mixing is formed by lithium battery, ultracapacitor, biphase rectification/inverter and first, second dc/dc current transformer
Energy-storage system, the low-pressure side of a dc/dc current transformer connects lithium battery, and the high-pressure side of a described dc/dc current transformer connects the
The low-pressure side of two dc/dc current transformers, a described dc/dc current transformer is simultaneously in parallel with described ultracapacitor, described 2nd dc/dc
Current transformer high-pressure side is connected to the DC side of biphase rectification/inverter, and the AC of biphase rectification/inverter is connected in parallel on wind energy turbine set and goes out
The low-pass first order filter of mouth；
Charging-discharging controller, respectively with electrical network, described low-pass first order filter, a dc/dc current transformer and described second
Dc/dc current transformer connects；
It is connected to the sliding average algorithm device of lithium battery and ultracapacitor input side, when mixed energy storage system runs, institute
State controller with wind power output power and grid-connected reference power as foundation, it is low that described charging-discharging controller uses fuzzy control to calculate
Pass filtering time constant, Power Output for Wind Power Field after described low-pass first order filter, by sliding average algorithm device
Stabilize control targe, and pass to dc/dc current transformer, and then control lithium battery and ultracapacitor to carry out power and handle up,
Afterwards the power after stabilizing is sent into electrical network.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, described discharge and recharge
Controller carries out stabilizing control based on the first-order low-pass ripple algorithm becoming time constant to wind power output power, that is, the charge and discharge stabilized
Electrical power is:
In formula: pwindT () is the filtered front power of t wind power；pwind(t- δ t) is a upper moment wind power
Filtered rear power；τ is time constant filter；
To determine the time constant of low-pass first order filter using fuzzy control, to define a new variable: wind-powered electricity generation output
Power swing degree p0(t), expression formula is:
In formula: prefT () is grid-connected reference power, as input x (t) of fuzzy control.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, described discharge and recharge
Wind power output power undulate quantity is divided into five grades by controller, selects corresponding low-pass filtering by fuzzy control output result
Time constant.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, it is situated between according to energy storage
Matter residual capacity situation specifies that corresponding power distribution strategies are: power density is big, the ultracapacitor that has extended cycle life is preferential
Discharge and recharge；When lithium battery residual capacity is enough, it is stabilized for power, sets lithium battery, ultracapacitor residual capacity
soc-bat、soc-cap.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, described power divides
Joining strategy is:
Work as phessDuring (t) ＞ 0, i.e. mixed energy storage system electric discharge, different electric discharges are defined according to ultracapacitor soc change
State:
Discharge condition 1:soc-cap＞ 0.1, ultracapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:soc-cap＜ 0.1, soc-bat＞ 0.4, lithium battery discharges, and ultracapacitor does not work；
Discharge condition 3:soc-bat＜ 0.4, then do not work；
Work as phessT, during ()≤0, that is, mixed energy storage system charges.Different charging shapes are defined according to lithium battery soc change
State:
Charged state 1:soc-bat＞ 0.8, ultracapacitor charges；
Charged state 2:soc-bat＜ 0.8, lithium cell charging.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, described slip is put down
Mean algorithm device is used for:
N item time serieses phess(t+n δ t) calculates the meansigma methodss of multiple continuous m item sequences, wherein continuous m item sequence
Section 1, is Section 1 p of original n sequencehessT () is to m item phess(t+m δ t) sum is divided by m；The of continuous m item sequence
Binomial phess(t+ δ t) is the Section 2 of original n sequence to m+1 item phess(t+ (m+1) δ t) sum is divided by m；By that analogy,
The sliding average algorithm expression formula of lithium battery and ultracapacitor is:
In formula: preal-bat(t)、preal-cap(t) be respectively lithium battery after sliding average algorithm process for the t,
Ultracapacitor power；pbat(t)、pcapT () is t without the lithium battery of sliding average algorithm process, super capacitor
Device power.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, described discharge and recharge
Controller adopts buck-boost two-way dc/dc chopper controller, and adopts power outer shroud, the double-closed-loop control of current inner loop
Pattern.
Further, in the control device of the above-mentioned energy-storage system for stabilizing wind power output power, outside described power
Ring is used for maintaining stablizing of output, and current inner loop set-point is obtained divided by DC voltage by power, then given value of current
Value and detection electric current do deviation, through pi link, obtain modulation voltage, modulation voltage, through spwm, obtains control signal, described
Control signal is used for controlling two-way dc/dc chopper, thus controlling lithium battery power output.
Compared with prior art, the present invention is in the case that grid-connected reference power gives, with fuzzy control principle, according to
Wind power output power selected low-pass filtering time constant with the departure degree of grid-connected reference value, calculates simple, holding output
Follow regulation goal value；Mixed energy storage system power is carried out point with the control strategy of ultracapacitor priority task principle
Join；By moving averages value-based algorithm is connected to mixed energy storage system input side, fluctuate for stabilizing spike and the wind-powered electricity generation toward renaturation,
With sliding average principle to stabilize target carry out secondary stabilize, be used for stabilizing spike and toward the fluctuation of renaturation wind power, prolong
The long energy-storage system life-span；Energy-storage system is controlled by quantity of power is changed into the magnitude of current, it is possible to achieve its power is handled up
Quickly, accurately control, improve dynamic performance.By implementing above-mentioned power distribution strategies, make the mixed energy storage system can be
Under conditions permit, preferential ultracapacitor work, can effectively stabilize wind power output power fluctuation, be avoided that lithium battery is excessive again
Discharge and recharge task, extend cycle life, effectively reduce the cost of mixed energy storage system.While energy-storage system is protected, dimension
Hold grid-connected power about grid-connected desired value.Its simulation result shows: proposed by the invention stabilizes for wind power output power
Mixed energy storage system control strategy compared with the Traditional control strategy, it is to avoid energy-storage system excessively regulates and controls, and grid-connected power maintains
About grid-connected desired value.
Brief description
Fig. 1 is the structure of the control device of the energy-storage system for stabilizing wind power output power of one embodiment of the invention
Figure；
Fig. 2 a and 2b is that the control of the energy-storage system for stabilizing wind power output power of one embodiment of the invention sets respectively
Standby input/output surface chart；
Fig. 3 is the Fuzzy control system input/output surface chart of one embodiment of the invention；
Fig. 4 be one embodiment of the invention wind power output power undulate quantity is divided into five grade control flow flow charts；
Fig. 5 is the flow chart of the power distribution strategies of one embodiment of the invention；
Fig. 6 is the lithium battery power Double-loop control block diagram of one embodiment of the invention；
Fig. 7 is the schematic diagram of the power swing signal generator of one embodiment of the invention
Fig. 8 is that the wind power output power of one embodiment of the invention stabilizes figure；
Fig. 9 is the conventional filter of one embodiment of the invention and becomes the comparison diagram that time constant filter power is stabilized；
Figure 10 is the wind power output power p of one embodiment of the inventionwind(t), according to the determination of energy-storage system state-of-charge
Grid-connected power p 'outGrid-connected power p with the present inventionoutComparison diagram；
Figure 11 is that the power of one embodiment of the invention directly controls p "outWith double-closed-loop control poutComparison diagram；
Figure 12 is lithium battery and the ultracapacitor charge-discharge electric power curve chart of one embodiment of the invention；
Figure 13 is the power pair that moving averages value-based algorithm is compared to fricton-tight average algorithm that has of one embodiment of the invention
Than figure.
Specific embodiment
Understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings and specifically real
The present invention is further detailed explanation to apply mode.
As shown in figure 1, the present invention provides a kind of control device of the energy-storage system for stabilizing wind power output power, including
Wind energy turbine set and mixed energy storage system, wherein,
It is made up of described lithium battery 3, ultracapacitor 4, biphase rectification/inverter 5 and first, second dc/dc current transformer
Mixed energy storage system, the low-pressure side of a dc/dc current transformer 1 connects lithium battery, and the high-pressure side of a described dc/dc current transformer is even
Connect the low-pressure side of the 2nd dc/dc current transformer 2, a described dc/dc current transformer is simultaneously in parallel with described ultracapacitor, described second
Dc/dc current transformer 2 high-pressure side is connected to the DC side of biphase rectification/inverter, and the AC of biphase rectification/inverter is connected in parallel on wind
The low-pass first order filter 7 of electric field 6 outlet；
Charging-discharging controller 8, respectively with electrical network 10, described low-pass first order filter, a dc/dc current transformer and described
Two dc/dc current transformers connect；
It is connected to lithium battery 3 and the sliding average algorithm device 9 of ultracapacitor 4 input side, when mixed energy storage system runs,
With wind power output power and grid-connected reference power as foundation, charging-discharging controller uses fuzzy control to calculate low pass to described controller
Time constant filter, Power Output for Wind Power Field, after described low-pass first order filter, is put down by sliding average algorithm device
Suppression control targe, and pass to dc/dc current transformer, and then control lithium battery and ultracapacitor to carry out power and handle up, realize
Stabilizing of wind power fluctuation, finally sends the power after stabilizing into electrical network.Serve as " power buffering with moving averages value-based algorithm
Device ", is connected to lithium battery and ultracapacitor input side.Realize stabilizing and toward the fluctuation of renaturation wind power of spike.By wind-powered electricity generation work(
Rate fluctuation limits within the specific limits, it is to avoid the excessive regulation and control that energy-storage system fluctuates to wind power, realizes mixed energy storage system
Reduce discharge and recharge number of times and prolong long-life purpose.The present invention passes through moving averages value-based algorithms, it is to avoid energy-storage system is excessively adjusted
Control, is conducive to energy-storage system life-time dilatation；Two dc/dc chopper controller, are carried out by quantity of power is converted into the magnitude of current
Control, can achieve quick, the accurate control to lithium battery and ultracapacitor discharge and recharge task it is ensured that control strategy smooth
Realize.
Preferably, control targe is mixed energy storage system gross capability, and charging-discharging controller of the present invention is based on the change time
The first-order low-pass ripple algorithm of constant carries out stabilizing control to wind power output power, that is, the charge-discharge electric power stabilized is:
In formula: pwindT () is the filtered front power of t wind power；pwind(t- δ t) is a upper moment wind power
Filtered rear power；τ is time constant filter；
In order that power is more stable exporting, using fuzzy control, the present invention to determine that the time of low-pass first order filter is normal
Number.Define a new variable: wind power output power fluctuation degree p0(t), expression formula is:
In formula: prefT () is grid-connected reference power, as input x (t) of fuzzy control, input membership function and
Respectively as shown in figures 2 a and 2b, Fuzzy control system input/output curved surface is as shown in Figure 3 for output membership function.
Preferably, become the Controlling principle of time constant: according to wind power output power fluctuation degree p0T the size of (), segmentation is adjusted
Whole suitable low-pass filtering time constant, i.e. dynamic regulation mixed energy storage system charge-discharge electric power, realize stabilizing rear power more
Stable output.
Preferably, wind power output power undulate quantity is divided into five grades by charging-discharging controller of the present invention, by fuzzy
Output result is controlled to select corresponding low-pass filtering time constant.Wind power output power undulate quantity is divided into five grades to control
Flow process is as shown in figure 4, in Practical Project uses, segment level quantity can be adjusted by actual wind regime.For differently
The wind energy turbine set of reason position, can be analyzed to its history generated output curve, try to achieve main vibration frequency scope, big according to scope
The quantity of little setting low-pass filtering time constant；The concrete selection of time constant can be according to the concrete property of mixed energy storage system
With the requirement to grid-connected power swing rate, thus meet the wave filter of design under different wind regime grid-connected stability bandwidth without departing from country
Regulation.
Preferably, corresponding power distribution strategies are specified according to energy-accumulating medium residual capacity situation, power distribution principle is:
The preferential discharge and recharge of ultracapacitor that power density is big, have extended cycle life；When lithium battery residual capacity is enough, it is used for power
Stabilize, set lithium battery, ultracapacitor residual capacity soc-bat、soc-cap.
Preferably, the flow process of power distribution strategies is as shown in Figure 5:
Work as phessDuring (t) ＞ 0, i.e. mixed energy storage system electric discharge, different electric discharges are defined according to ultracapacitor soc change
State:
Discharge condition 1:soc-cap＞ 0.1, ultracapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:soc-cap＜ 0.1, soc-bat＞ 0.4, lithium battery discharges, and ultracapacitor does not work；
Discharge condition 3:soc-bat＜ 0.4, then do not work；
Work as phessT, during ()≤0, that is, mixed energy storage system charges.Different charging shapes are defined according to lithium battery soc change
State:
Charged state 1:soc-bat＞ 0.8, ultracapacitor charges；
Charged state 2:soc-bat＜ 0.8, lithium cell charging.By implementing above-mentioned power distribution strategies, make hybrid energy-storing system
System can be under conditions permit, preferential ultracapacitor work.Wind power output power fluctuation can effectively be stabilized, be avoided that lithium again
The excessive discharge and recharge task of battery, extends cycle life.Effectively reduce the cost of mixed energy storage system.
Preferably, described sliding average algorithm device is used for:
N item time serieses phess(t+n δ t) calculates the meansigma methodss of multiple continuous m item sequences, wherein continuous m item sequence
Section 1, is Section 1 p of original n sequencehessT () is to m item phess(t+m δ t) sum is divided by m；The of continuous m item sequence
Binomial phess(t+ δ t) is the Section 2 of original n sequence to m+1 item phess(t+ (m+1) δ t) sum is divided by m；By that analogy,
The sliding average algorithm expression formula of lithium battery and ultracapacitor is:
In formula: preal-bat(t)、preal-cap(t) be respectively lithium battery after sliding average algorithm process for the t,
Ultracapacitor power；pbat(t)、pcapT () is t without the lithium battery of sliding average algorithm process, super capacitor
Device power.
Preferably, described charging-discharging controller adopts buck-boost two-way dc/dc chopper controller, for improving system
It is ensured that the stablizing of lithium battery and ultracapacitor output, the control system of the present invention adopts power outer shroud, electricity to dynamic property
The double-closed-loop control pattern of stream internal ring is optimized, and by way of quantity of power is converted into the magnitude of current, improves system response speed
Degree.
Preferably, as shown in fig. 6, described power outer shroud is used for maintaining the steady of output taking lithium battery controller as a example
Fixed, current inner loop set-point is obtained divided by DC voltage by power, and then given value of current value and detection electric current do deviation, pass through
Pi link, obtains modulation voltage, and modulation voltage, through spwm, obtains control signal, and described control signal is used for controlling two-way dc/
Dc chopper, thus control lithium battery power output.
It is the simulation analysis of the present invention as follows:
1. parameter setting
Structure according to Fig. 1, carries out simulating, verifying under matlab/simulink environment.Simulation parameter is provided that
Sampling interval t=1 × 10-5S, lithium battery group 250v, 10ah, initial soc=70%；Capacity of super capacitor 10f, pressure
400v, initial voltage 400v；Filter inductance 10mh in dc/dc (1), dc/dc (2)；Pi controller parameter: kp=2, ki=10；Sliding
Dynamic average algorithm m=5.
2. the validation verification of mixed energy storage system control strategy and its system
The present invention sets energy storage system discharges power as just, charge power is negative, and wind power is just.Grid-connected reference power
prefT () is 12kw, vibration frequency 50hz, and lithium battery presses 50a constant current charge-discharge.Simulation objectives: verify control strategy of the present invention
Effectiveness, realizes stabilizing of power swing；Checking mixed energy storage system under the control system that the present invention design, lithium battery and surpass
The power of level capacitor is quick, accurately control.
The checking that 2.1 power swings are stabilized
Fig. 7 is the 50hz vibration frequency signal generator setting.With 0.2s as a cycle, the letter of the different amplitude of output
Number, realize the effect of simulation wind power fluctuation.In Fig. 8, pwindT front wind power output power (- 2～15kw) is stabilized in () expression；
Phess is mixed energy storage system charge-discharge electric power；Pout is to stabilize rear power.Work as pwindT () is more than prefT (), energy-storage system fills
Electricity, absorbs surplus power；Work as pwindT () is less than pref(t), energy storage system discharges, compensate not enough power.Control and stabilize wind
Electrical power fluctuation size, keeps output to follow regulation goal value.Result shows that the power pout after stabilizing maintains essentially in
12kw.
Change according to energy-storage system state-of-charge is determining grid-connected power, it is to avoid the overshoot of energy-storage system and crossing is put.Its
Major advantage is the protection to energy-storage system, but grid-connected power is unable to maintain that in grid-connected desired value.Control proposed by the present invention
Strategy (is realized by power distribution strategies) while protecting energy-storage system, can maintain grid-connected desired value as far as possible.Figure
10 is wind power output power pwind(t), the grid-connected power p ' being determined according to energy-storage system state-of-chargeout11 and the present invention simultaneously
Net power pout12 contrast.It is seen that due to the restriction of energy-storage system residual capacity, p 'outCannot ensure to maintain
12kw, and poutWaveform maintains essentially in 12kw.
Fig. 9 is conventional filter and becomes the contrast that time constant filter power is stabilized.Fuzzy according to Fig. 2 a, 2b
Control membership function, to running analysis between 0～0.8s for the analogue system.Deviateed grid-connected according to wind power output power
The degree of reference power, exports low-pass filtering time constant by fuzzy control.From Fig. 9,0.26s～0.305s can be seen that
When wind power output power is near 12kw, constant low-pass filtering of fixing time and become time constant low-pass filtering to stabilize effect several
Identical；When the rate of change of wind power output power fluctuation is larger, become time constant low-pass first order filter stabilizes effect more
Good.Have an advantage in that energy " treatment in accordance with local conditions ", according to different wind power output power adjustment time constants, what setting was different stabilizes mesh
Mark.
The checking of 2.2 power distributions
Using fuzzy control theory, the part beyond grid-connected reference value is allocated in mixed energy storage system, can be effective
Stabilize wind power fluctuation, have an advantage in that and avoid the out-of-limit phenomenon of energy-storage system state it is achieved that protecting the purpose of energy-storage system,
But this strategy is the direct control to power leads to dynamic performance poor, and spike and past renaturation wind power fluctuation meeting
The excessive regulation and control of impact energy-storage system, cause the life consumption of battery energy storage.The controller based on optimization design for the present invention is being protected
While shield energy-storage system, it is to avoid the excessive regulation and control of system.
By the double-closed-loop control (power outer shroud, current inner loop) in dc/dc (1) and dc/dc (2) it is achieved that to energy storage
Quick, the exact power of system control.Power is directly controlled p by Figure 11 "outWith double-closed-loop control poutContrasted, found
p″outDue to the direct control of power, cause the accumulation of power deviation.And dynamic property is poor, power curve has significantly stagnant
Afterwards.
In conjunction with Fig. 8, from lithium battery in Figure 12 and ultracapacitor charge-discharge electric power curve: ultracapacitor preferentially fills
Electric discharge, only when ultracapacitor residual capacity is not enough, lithium battery compensates remaining control targe, extends the energy-storage system life-span
Simultaneously it is ensured that output follows regulation goal value；Running concrete analysis between 0～0.1s: energy-storage system
Electric discharge, because ultracapacitor residual capacity is more than 0.1, ultracapacitor preferential discharge, lithium battery is failure to actuate.And due to 0s
Wind speed mutation causes wind power output power fluctuation excessive, and for protecting lithium battery, it maintains a upper moment charge-discharge electric power constant, by
Ultracapacitor undertakes whole wind-powered electricity generation undulate quantity, it is to avoid lithium battery is impacted.Other times Duan Jieke carries out similar analysis.
Understood from Figure 13 contrast: the excessive tune of traditional energy-storage system can be caused due to spike and toward renaturation wind power fluctuation
Control；And be connected to lithium battery and ultracapacitor input side have moving averages value-based algorithm 12 compared to fricton-tight average algorithm 11
Such power swing can be stabilized to a certain extent.Reduce the impact to mixed energy storage system for the power swing, extend energy-storage system
Life-span.
As the above analysis: this control strategy is with respect to the control being changed with energy-storage system residual capacity using time constant
System strategy has certain advantage, on the premise of protection energy-storage system, can preferably maintain grid-connected power in grid-connected reference value, have
Beneficial to the stabilization of power grids.
In sum, the present invention is in the case that grid-connected reference power gives, with fuzzy control principle, defeated according to wind-powered electricity generation
The departure degree going out power with grid-connected reference value selectes low-pass filtering time constant, and calculating is simple, keep output to follow tune
Degree desired value；Control strategy with ultracapacitor priority task principle is allocated to mixed energy storage system power；Pass through
Moving averages value-based algorithm is connected to mixed energy storage system input side, for stabilizing spike and the wind-powered electricity generation fluctuation toward renaturation, with cunning
Dynamic meansigma methodss principle to stabilize target carry out secondary stabilize, be used for stabilizing spike and toward the fluctuation of renaturation wind power, extend energy storage
Lifetime of system；Energy-storage system is controlled by quantity of power is changed into the magnitude of current, it is possible to achieve it is quick, accurate that its power is handled up
Really control, improve dynamic performance.By implementing above-mentioned power distribution strategies, make the mixed energy storage system can be in conditions permit
Under, preferential ultracapacitor work, can effectively stabilize wind power output power fluctuation, be avoided that the excessive discharge and recharge of lithium battery again
Task, extends cycle life, effectively reduces the cost of mixed energy storage system.While energy-storage system is protected, maintain grid-connected work(
Rate is about grid-connected desired value.Its simulation result shows: proposed by the invention stores up for the mixing that wind power output power is stabilized
Can system control strategy compared with Traditional control strategy, it is to avoid energy-storage system excessively regulates and controls, and grid-connected power maintains and mesh
About scale value.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Professional further appreciates that, in conjunction with disclosed in this invention embodiment description each example list
Unit and algorithm steps, can be with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware
With the interchangeability of software, generally describe composition and the step of each example in the above description according to function.This
A little functions to be executed with hardware or software mode actually, the application-specific depending on technical scheme and design constraint.Specially
Industry technical staff can use different methods to each specific application realize described function, but this realization is not
It is considered as beyond the scope of this invention.
Obviously, those skilled in the art can carry out the various changes and modification spirit without deviating from the present invention to invention
And scope.So, if these modifications of the present invention and modification belong to the claims in the present invention and its equivalent technologies scope it
Interior, then the present invention is also intended to including these changes and modification.
Claims (8)
1. a kind of control device of the energy-storage system for stabilizing wind power output power is it is characterised in that including wind energy turbine set and mixing
Close energy-storage system, wherein,
Described hybrid energy-storing is formed by lithium battery, ultracapacitor, biphase rectification/inverter and first, second dc/dc current transformer
System, the low-pressure side of a dc/dc current transformer connects lithium battery, and the high-pressure side of a described dc/dc current transformer connects the 2nd dc/
The low-pressure side of dc current transformer, a described dc/dc current transformer is simultaneously in parallel with described ultracapacitor, described 2nd dc/dc unsteady flow
Device high-pressure side is connected to the DC side of biphase rectification/inverter, and the AC of biphase rectification/inverter is connected in parallel on wind energy turbine set outlet
Low-pass first order filter；
Charging-discharging controller, respectively with electrical network, described low-pass first order filter, a dc/dc current transformer and described 2nd dc/dc
Current transformer connects；
It is connected to the sliding average algorithm device of lithium battery and ultracapacitor input side, when mixed energy storage system runs, described control
With wind power output power and grid-connected reference power as foundation, described charging-discharging controller uses fuzzy control to calculate low pass filtered to device processed
Ripple time constant, Power Output for Wind Power Field, after described low-pass first order filter, is stabilized by sliding average algorithm device
Control targe, and pass to dc/dc current transformer, and then control lithium battery and ultracapacitor to carry out power and handle up, finally handle
Power after stabilizing sends into electrical network.
2. the as claimed in claim 1 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
State charging-discharging controller and carry out stabilizing control based on the first-order low-pass ripple algorithm becoming time constant to wind power output power, that is, put down
The charge-discharge electric power of suppression is:
In formula: pwindT () is the filtered front power of t wind power；pwind(t- δ t) is a upper moment wind power through filter
Power after ripple；τ is time constant filter；
To determine the time constant of low-pass first order filter using fuzzy control, to define a new variable: wind power output power
Fluctuation degree p0(t), expression formula is:
In formula: prefT () is grid-connected reference power, as input x (t) of fuzzy control.
3. the as claimed in claim 2 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
State charging-discharging controller and wind power output power undulate quantity is divided into five grades, select by fuzzy control output result corresponding
Low-pass filtering time constant.
4. the as claimed in claim 3 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that root
Specify that corresponding power distribution strategies are according to energy-accumulating medium residual capacity situation: power density is big, the super electricity that has extended cycle life
The preferential discharge and recharge of container；When lithium battery residual capacity is enough, it is stabilized for power, sets lithium battery, ultracapacitor remains
Covolume amount soc-bat、soc-cap.
5. the as claimed in claim 4 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
Stating power distribution strategies is:
Work as phessDuring (t) ＞ 0, i.e. mixed energy storage system electric discharge, changed according to ultracapacitor soc and define different discharge conditions:
Discharge condition 1:soc-cap＞ 0.1, ultracapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:soc-cap＜ 0.1, soc-bat＞ 0.4, lithium battery discharges, and ultracapacitor does not work；
Discharge condition 3:soc-bat＜ 0.4, then do not work；
Work as phessT, during ()≤0, that is, mixed energy storage system charges.Changed according to lithium battery soc and define different charged states:
Charged state 1:soc-bat＞ 0.8, ultracapacitor charges；
Charged state 2:soc-bat＜ 0.8, lithium cell charging.
6. the as claimed in claim 5 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
State sliding average algorithm device to be used for:
N item time serieses phess(t+n δ t) calculates the meansigma methodss of multiple continuous m item sequences, and the first of wherein continuous m item sequence
, it is Section 1 p of original n sequencehessT () is to m item phess(t+m δ t) sum is divided by m；The Section 2 of continuous m item sequence
phess(t+ δ t) is the Section 2 of original n sequence to m+1 item phess(t+ (m+1) δ t) sum is divided by m；By that analogy, lithium electricity
The sliding average algorithm expression formula of pond and ultracapacitor is:
In formula: preal-bat(t)、preal-capT () is respectively lithium battery after sliding average algorithm process for the t, super
Capacitor power；pbat(t)、pcapT () is t without the lithium battery of sliding average algorithm process, ultracapacitor work(
Rate.
7. the as claimed in claim 6 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
State charging-discharging controller and adopt buck-boost two-way dc/dc chopper controller, and adopt power outer shroud, current inner loop double
Closed loop control mode.
8. the as claimed in claim 7 control device being used for stabilizing the energy-storage system of wind power output power is it is characterised in that institute
State power outer shroud for maintaining stablizing of output, current inner loop set-point is obtained divided by DC voltage by power, then
Given value of current value and detection electric current do deviation, through pi link, obtain modulation voltage, modulation voltage, through spwm, is controlled
Signal, described control signal is used for controlling two-way dc/dc chopper, thus controlling lithium battery power output.
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