CN106340892B - For stabilizing the control equipment of the energy-storage system of wind power output power - Google Patents
For stabilizing the control equipment of the energy-storage system of wind power output power Download PDFInfo
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- CN106340892B CN106340892B CN201610890458.8A CN201610890458A CN106340892B CN 106340892 B CN106340892 B CN 106340892B CN 201610890458 A CN201610890458 A CN 201610890458A CN 106340892 B CN106340892 B CN 106340892B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 105
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 230000005611 electricity Effects 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
- 238000009826 distribution Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 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
- 230000033228 biological regulation Effects 0.000 abstract description 9
- 238000004153 renaturation Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 description 8
- 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
- 230000008859 change Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 241001125929 Trisopterus luscus Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007812 deficiency 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
- 230000010354 integration Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 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
- 230000000750 progressive effect Effects 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
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of for stabilizing the control equipment of the energy-storage system of wind power output power, the present invention is in the case where grid-connected reference power is given, with fuzzy control principle, low-pass filtering time constant is selected according to wind power output power and the departure degree of grid-connected reference value, simple, holding output power is calculated and follows regulation goal value；Mixed energy storage system power is allocated with the control strategy of supercapacitor priority task principle；By the way that sliding average value-based algorithm is connected to mixed energy storage system input side, for stabilizing spike and being fluctuated toward the wind-powered electricity generation of renaturation, with sliding average principle to stabilize target carry out it is secondary stabilize, for stabilize spike and toward renaturation wind power fluctuate, extend the energy-storage system service life；Energy-storage system is controlled by the way that quantity of power is changed into the magnitude of current, may be implemented that its power handles up it is quick, accurately control, improve dynamic performance.
Description
Technical field
The present invention relates to a kind of for stabilizing the control equipment of the energy-storage system of wind power output power.
Background technique
Wind energy has technology maturation, advantage of lower cost, cleanliness without any pollution and the advantages such as environmentally friendly, and becoming can be again
The representative of raw clean energy resource.But since wind-powered electricity generation is limited by its natural conditions, there is fluctuation, intermittence and can not accurately predict
Feature as large-scale wind power integration will certainly cause many adverse effects to Operation of Electric Systems, or even will cause extensive
Serious accident, to restrict the development of Wind Power Generation Industry.Energy-storage system as during Operation of Electric Systems after " adopt-send out-
The 6th link after five big links of defeated-with-use ", can effectively improve wind-powered electricity generation scale, so that electric system becomes " softness ",
Largely improve stable power system security, economy and flexibility.
It is influenced by energy storage mechnism, lithium battery energy density is high, and power density, service life cycle are low；Supercapacitor function
Rate density, cycle life are high, and energy density is low.Mixed energy storage system combines the advantages of two kinds of energy-accumulating mediums, improves energy storage
The overall performance of system becomes the effective ways for stabilizing wind power fluctuation.To give full play to the excellent of different type energy-accumulating medium
Gesture, how to design rationally effective control strategy becomes the key of mixed energy storage system application.Existing scheme is first is that with sliding
Average value principle carries out power distribution to mixed energy storage system, but in engineering application, it is difficult to suitable time constant is chosen, and
And it can not accomplish accurate control to output power.Existing scheme is smooth second is that according to the residual capacity divided rank of battery
Low-pass filtering time constant is adjusted, extends the battery energy storage service life, but not can guarantee grid-connected power and maintain target value.Existing scheme
Third is that being allocated with fuzzy theory to energy-storage system power, the reasonable distribution of mixed energy storage system power is realized, extend storage
Energy lifetime of system, but calculating is cumbersome, and time-consuming.Battery caused by power minor swing excessively regulates and controls to influence its service life.And this
Strategy is to cause dynamic performance poor directly controlling for power.
Summary of the invention
The purpose of the present invention is to provide a kind of for stabilizing the control equipment of the energy-storage system of wind power output power, can
While to energy-storage system protection, maintain grid-connected power in grid-connected target value or so.
It is set to solve the above problems, the present invention provides a kind of control for stabilizing the energy-storage system of wind power output power
It is standby, including wind power plant and mixed energy storage system, wherein
The mixing is formed by lithium battery, supercapacitor, biphase rectification/inverter and the first, second DC/DC current transformer
Energy-storage system, the low-pressure side of the first DC/DC current transformer connect lithium battery, the high-pressure side connection of the first DC/DC current transformer the
The low-pressure side of two DC/DC current transformers, the first DC/DC current transformer is simultaneously in parallel with the supercapacitor, the 2nd DC/DC
Current transformer high-pressure side is connected to biphase rectification/inverter DC side, and biphase rectification/inverter exchange side is connected in parallel on wind power plant and goes out
The low-pass first order filter of mouth；
Charging-discharging controller, respectively with power grid, the low-pass first order filter, the first DC/DC current transformer and described second
The connection of DC/DC current transformer；
It is connected to the sliding average algorithm device of lithium battery and supercapacitor input side, when mixed energy storage system is run, institute
Controller is stated using wind power output power and grid-connected reference power as foundation, the charging-discharging controller calculates low with fuzzy control
Pass filtering time constant, Power Output for Wind Power Field are passed through after the low-pass first order filter, and sliding average algorithm device is passed through
Control target is stabilized, and passes to DC/DC current transformer, and then control lithium battery and supercapacitor carry out power and handle up, most
The power after stabilizing is sent into power grid afterwards.
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, the charge and discharge
Controller carries out the charge and discharge stabilizing control, that is, stabilizing to wind power output power based on the first-order low-pass wave algorithm for becoming time constant
Electrical power are as follows:
In formula: Pwind(t) preceding power is filtered for t moment wind power；Pwind(t- Δ t) is last moment wind power
The power after filtering；τ is time constant filter；
The time constant of low-pass first order filter is determined using fuzzy control, defines a new variable: wind-powered electricity generation output
Power swing degree P0(t), expression formula are as follows:
In formula: PrefIt (t) is grid-connected reference power, as the input x (t) of fuzzy control.
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, the charge and discharge
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 equipment 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 provides corresponding power distribution strategies are as follows: power density is big, the supercapacitor that has extended cycle life is preferential
Charge and discharge；It when lithium battery residual capacity is enough, is used for power and stabilizes, set lithium battery, supercapacitor residual capacity
Soc-bat、Soc-cap。
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, the power point
With strategy are as follows:
Work as PHESS(t) > 0 when, i.e., mixed energy storage system discharges, and defines different electric discharges according to supercapacitor SOC variation
State:
Discharge condition 1:Soc-cap> 0.1, supercapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:Soc-cap< 0.1, Soc-bat> 0.4, lithium battery electric discharge, supercapacitor does not work；
Discharge condition 3:Soc-bat< 0.4, then it does not work；
Work as PHESS(t)≤0 when, i.e., mixed energy storage system charges.Different charging shapes is defined according to lithium battery SOC variation
State:
Charged state 1:Soc-bat> 0.8, supercapacitor charging；
Charged state 2:Soc-bat< 0.8, lithium battery charging.
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, the sliding is flat
Mean algorithm device is used for:
N time series PHESS(t+n Δ t) calculates the average value of multiple continuous m sequences, wherein continuous m sequence
First item is the first item P of original n sequenceHESS(t) to m PHESS(the sum of t+m Δ t) is divided by m；The of continuous m sequences
Binomial PHESS(t+ Δ t) is the Section 2 of original n sequence to m+1 PHESS(the sum of t+ (m+1) Δ t) is divided by m；And so on,
The sliding average algorithm expression formula of lithium battery and supercapacitor are as follows:
In formula: Preal-bat(t)、Preal-cap(t) be respectively lithium battery of the t moment after sliding average algorithm process,
Supercapacitor power；Pbat(t)、PcapIt (t) is lithium battery, super capacitor of the t moment without sliding average algorithm process
Device power.
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, the charge and discharge
Controller uses the two-way DC/DC chopper controller of Buck-Boost, and uses power outer ring, the double-closed-loop control of current inner loop
Mode.
Further, in the control equipment of the above-mentioned energy-storage system for stabilizing wind power output power, outside the power
Ring is used to maintain the stabilization of output power, and current inner loop given value is obtained by power divided by DC voltage, then given value of current
Value and detection electric current do deviation, by PI link, obtain modulation voltage, and modulation voltage passes through SPWM, obtain control signal, described
Control signal is for controlling two-way DC/DC chopper, to control lithium battery power output.
Compared with prior art, the present invention is in the case where grid-connected reference power is given, with fuzzy control principle, according to
Wind power output power and the departure degree of grid-connected reference value select low-pass filtering time constant, calculate simple, holding output power
Follow regulation goal value；Control strategy with supercapacitor priority task principle divides mixed energy storage system power
Match；By the way that sliding average value-based algorithm is connected to mixed energy storage system input side, for stabilizing spike and being fluctuated toward the wind-powered electricity generation of renaturation,
With sliding average principle to stabilize target carry out it is secondary stabilize, for stabilize spike and toward renaturation wind power fluctuate, prolong
The long energy-storage system service life；Energy-storage system is controlled by the way that quantity of power is changed into the magnitude of current, may be implemented what its power was handled up
Quickly, it accurately controls, improves dynamic performance.By implementing above-mentioned power distribution strategies, make mixed energy storage system can be
Under conditions permit, preferential supercapacitor work, can effectively stabilize wind power output power fluctuation and lithium battery is excessive
Charge and discharge task, extend cycle life, the cost of mixed energy storage system is effectively reduced.While to energy-storage system protection, dimension
Grid-connected power is held in grid-connected target value or so.Its simulation result shows: proposed by the invention to stabilize for wind power output power
Mixed energy storage system control strategy compared with Traditional control strategy, avoid energy-storage system and excessively regulate and control, grid-connected power maintains
In grid-connected target value or so.
Detailed description of the invention
Fig. 1 is the structure of the control equipment of the energy-storage system for stabilizing wind power output power of one embodiment of the invention
Figure；
Fig. 2 a and 2b are that the control of the energy-storage system for stabilizing wind power output power of one embodiment of the invention is set 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 is that wind power output power undulate quantity is divided into five grade control flow flow charts by one embodiment of the invention；
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 the comparison diagram that change time constant filter power is stabilized；
Figure 10 is the wind power output power P of one embodiment of the inventionwind(t), it is determined according to energy-storage system state-of-charge
Grid-connected power P 'outWith grid-connected power P of the 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 the lithium battery and supercapacitor charge-discharge electric power curve graph of one embodiment of the invention；
Figure 13 is that one embodiment of the invention has the sliding average value-based algorithm compared to the power pair of fricton-tight average algorithm
Than figure.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, the present invention provide it is a kind of for stabilizing the control equipment of the energy-storage system of wind power output power, including
Wind power plant and mixed energy storage system, wherein
Described in being made of lithium battery 3, supercapacitor 4, biphase rectification/inverter 5 and the first, second DC/DC current transformer
Mixed energy storage system, the low-pressure side of the first DC/DC current transformer 1 connect lithium battery, and the high-pressure side of the first DC/DC current transformer connects
The low-pressure side of the 2nd DC/DC current transformer 2 is connect, the first DC/DC current transformer is simultaneously in parallel with the supercapacitor, and described second
2 high-pressure side of DC/DC current transformer is connected to biphase rectification/inverter DC side, and biphase rectification/inverter exchange side is connected in parallel on wind
The low-pass first order filter 7 that electric field 6 exports；
Charging-discharging controller 8, respectively with power grid 10, the low-pass first order filter, the first DC/DC current transformer and described
The connection of two DC/DC current transformers；
It is connected to the sliding average algorithm device 9 of 4 input side of lithium battery 3 and supercapacitor, when mixed energy storage system is run,
For the controller using wind power output power and grid-connected reference power as foundation, charging-discharging controller calculates low pass with fuzzy control
Time constant filter, Power Output for Wind Power Field are passed through after the low-pass first order filter, flat by sliding average algorithm device
Suppression control target, and DC/DC current transformer is passed to, and then control lithium battery and supercapacitor carry out power and handle up, and realize
Wind power fluctuation is stabilized, and the power after stabilizing finally is sent into power grid." power buffering is served as with sliding average value-based algorithm
Device " is connected to lithium battery and supercapacitor input side.Realize spike stabilize and toward renaturation wind power fluctuate.By wind-powered electricity generation function
Rate fluctuation limits in a certain range, and mixed energy storage system is realized in the excessive regulation for avoiding energy-storage system from fluctuating wind power
It reduces charge and discharge number and extends the purpose in service life.The present invention is avoided energy-storage system and is excessively adjusted by sliding average value-based algorithm
Control, is conducive to energy-storage system life-time dilatation；Two DC/DC chopper controllers are carried out by the way that quantity of power is converted into the magnitude of current
Control, it can be achieved that lithium battery and supercapacitor charge and discharge task it is quick, accurately control, ensure that the smooth of control strategy
It realizes.
Preferably, target, that is, mixed energy storage system gross capability is controlled, charging-discharging controller of the present invention is based on becoming the time
The first-order low-pass wave algorithm of constant carries out the charge-discharge electric power stabilizing control, that is, stabilizing to wind power output power are as follows:
In formula: Pwind(t) preceding power is filtered for t moment wind power；Pwind(t- Δ t) is last moment wind power
The power after filtering；τ is time constant filter；
In order to make the more stable output of power, the present invention determines that the time of low-pass first order filter is normal using fuzzy control
Number.Define a new variable: wind power output power fluctuation degree P0(t), expression formula are as follows:
In formula: Pref(t) be grid-connected reference power, as the input x (t) of fuzzy control, input subordinating degree function and
Export subordinating degree function difference as shown in figures 2 a and 2b, Fuzzy control system input/output curved surface is as shown in Figure 3.
Preferably, become the Controlling principle of time constant: according to wind power output power fluctuation degree P0(t) size, segmentation are adjusted
Whole suitable low-pass filtering time constant, i.e. dynamic regulation mixed energy storage system charge-discharge electric power, realization stabilize 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
Control output result selects corresponding low-pass filtering time constant.Wind power output power undulate quantity is divided into five grade controls
As shown in figure 4, in Practical Project utilization, segment level quantity can be adjusted process by practical wind regime.For differently
The wind power plant for managing position, can analyze its history generated output curve, acquire main vibration frequency range, big according to range
The quantity of small setting low-pass filtering time constant；The specific 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 filter of design under different wind regime grid-connected stability bandwidth without departing from country
Regulation.
Preferably, corresponding power distribution strategies, power distribution principle are provided according to energy-accumulating medium residual capacity situation are as follows:
The preferential charge and discharge of supercapacitor that power density is big, has extended cycle life；When lithium battery residual capacity is enough, it to be used for power
It stabilizes, sets lithium battery, supercapacitor residual capacity Soc-bat、Soc-cap。
Preferably, the process of power distribution strategies is as shown in Figure 5:
Work as PHESS(t) > 0 when, i.e., mixed energy storage system discharges, and defines different electric discharges according to supercapacitor SOC variation
State:
Discharge condition 1:Soc-cap> 0.1, supercapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:Soc-cap< 0.1, Soc-bat> 0.4, lithium battery electric discharge, supercapacitor does not work；
Discharge condition 3:Soc-bat< 0.4, then it does not work；
Work as PHESS(t)≤0 when, i.e., mixed energy storage system charges.Different charging shapes is defined according to lithium battery SOC variation
State:
Charged state 1:Soc-bat> 0.8, supercapacitor charging；
Charged state 2:Soc-bat< 0.8, lithium battery charging.By implementing above-mentioned power distribution strategies, make hybrid energy-storing system
System can be under conditions permit, preferential supercapacitor work.Wind power output power fluctuation and lithium can effectively be stabilized
The excessive charge and discharge task of battery extends cycle life.The cost of mixed energy storage system is effectively reduced.
Preferably, the sliding average algorithm device is used for:
N time series PHESS(t+n Δ t) calculates the average value of multiple continuous m sequences, wherein continuous m sequence
First item is the first item P of original n sequenceHESS(t) to m PHESS(the sum of t+m Δ t) is divided by m；The of continuous m sequences
Binomial PHESS(t+ Δ t) is the Section 2 of original n sequence to m+1 PHESS(the sum of t+ (m+1) Δ t) is divided by m；And so on,
The sliding average algorithm expression formula of lithium battery and supercapacitor are as follows:
In formula: Preal-bat(t)、Preal-cap(t) be respectively lithium battery of the t moment after sliding average algorithm process,
Supercapacitor power；Pbat(t)、PcapIt (t) is lithium battery, super capacitor of the t moment without sliding average algorithm process
Device power.
Preferably, the charging-discharging controller uses the two-way DC/DC chopper controller of Buck-Boost, to improve system
Dynamic property guarantees that the stabilization of lithium battery and supercapacitor output power, control system of the invention use power outer ring, electricity
The double-closed-loop control mode of stream inner ring optimizes, and in such a way that quantity of power is converted into the magnitude of current, improves system response speed
Degree.
Preferably, by taking lithium battery controller as an example, as shown in fig. 6, the power outer ring is for maintaining the steady of output power
Fixed, current inner loop given value is obtained by power divided by DC voltage, and then given value of current value and detection electric current do deviation, is passed through
PI link obtains modulation voltage, and modulation voltage passes through SPWM, obtains control signal, the control signal is for controlling two-way DC/
DC chopper, to control lithium battery power output.
It is simulation analysis of the 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 resistance
400V, initial voltage 400V；Filter inductance 10mH in DC/DC (1), DC/DC (2)；PI controller parameter: Kp=2, Ki=10；It is 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 and is positive, and charge power is negative, and wind power is positive.Grid-connected reference power
PrefIt (t) is 12KW, vibration frequency 50HZ, lithium battery is by 50A constant current charge-discharge.Simulation objectives: verifying control strategy of the present invention
Validity realizes stabilizing for power swing；Verifying mixed energy storage system is under the control system that designs of the present invention, lithium battery and super
The power of grade capacitor is quick, accurately controls.
The verifying that 2.1 power swings are stabilized
Fig. 7 is the 50HZ vibration frequency signal generator of setting.Using 0.2s as a cycle, the letter of different amplitudes is exported
Number, realize the effect of simulation wind power fluctuation.In Fig. 8, Pwind(t) it indicates to stabilize preceding wind power output power (- 2~15KW)；
PHESS is mixed energy storage system charge-discharge electric power；Pout is to stabilize rear power.Work as Pwind(t) it is greater than Pref(t), energy-storage system fills
Electricity absorbs surplus power；Work as Pwind(t) it is less than Pref(t), energy storage system discharges compensate insufficient power.I.e. wind is stabilized in control
Electrical power fluctuates size, and output power is kept to follow regulation goal value.Power P out after stabilizing as the result is shown is maintained essentially in
12KW。
Grid-connected power is determined according to the variation of energy-storage system state-of-charge, avoids the overshoot and over-discharge of energy-storage system.Its
Major advantage is the protection to energy-storage system, but grid-connected power is unable to maintain that in grid-connected target value.Control proposed by the present invention
Strategy (is realized) while protecting energy-storage system by power distribution strategies, can maintain grid-connected target value as far as possible.Figure
10 be wind power output power Pwind(t), according to energy-storage system state-of-charge determine grid-connected power P 'out11 and it is of the invention and
Net power Pout12 comparison.It is seen that due to the limitation of energy-storage system residual capacity, P 'outIt not can guarantee and maintain
12KW, and PoutWaveform maintains essentially in 12KW or so.
Fig. 9 is the comparison that conventional filter and change time constant filter power are stabilized.It is obscured shown in a, 2b according to fig. 2
Subordinating degree function is controlled, operational process of the analogue system between 0~0.8s is analyzed.Deviateed according to wind power output power grid-connected
The degree of reference power exports low-pass filtering time constant by fuzzy control.0.26s~0.305s can be seen that from Fig. 9
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
It is identical；When the change rate of wind power output power fluctuation is larger, become time constant low-pass first order filter stabilizes effect more
It is good.The advantage is that can " adaptation to local conditions " set and different stabilize mesh according to different wind power output power adjustment time constants
Mark.
The verifying of 2.2 power distributions
It is allocated in mixed energy storage system using the part that fuzzy control theory will exceed grid-connected reference value, it can be effective
Wind power fluctuation is stabilized, the advantage is that and avoid the out-of-limit phenomenon of energy-storage system state, realizes the purpose of protection energy-storage system,
But this strategy is to cause dynamic performance poor directly controlling for power, and spike and past renaturation wind power fluctuate meeting
The excessive regulation for influencing energy-storage system, causes the life consumption of battery energy storage.The present invention is based on the controllers of optimization design to protect
While protecting energy-storage system, the excessive regulation of system is avoided.
By the double-closed-loop control (power outer ring, current inner loop) in DC/DC (1) and DC/DC (2), realize to energy storage
The quick of system, exact power control.Power is directly controlled P ' ' by Figure 11outWith double-closed-loop control PoutIt compares, finds P
‘’outDue to directly controlling for power, the accumulation of power deviation is caused.And dynamic property is poor, and power curve has apparent stagnant
Afterwards.
In conjunction with Fig. 8, from lithium battery in Figure 12 and supercapacitor charge-discharge electric power curve: supercapacitor is preferentially filled
Electric discharge, only when supercapacitor residual capacity deficiency, the remaining control target of lithium battery compensation extends the energy-storage system service life
Meanwhile guaranteeing that output power follows regulation goal value；From the operational process concrete analysis between 0~0.1s: energy-storage system
Electric discharge, since supercapacitor residual capacity is greater than 0.1, supercapacitor preferential discharge, lithium battery is failure to actuate.And due to 0s
Wind speed mutation causes wind power output power fluctuation excessive, to protect lithium battery, maintains last moment charge-discharge electric power constant, by
Supercapacitor undertakes entire wind-powered electricity generation undulate quantity, and lithium battery is avoided to be impacted.Other times Duan Jieke carries out similar analysis.
Known to Figure 13 comparison: will cause the excessive tune of traditional energy-storage system due to spike and toward the fluctuation of renaturation wind power
Control；And be connected to lithium battery and supercapacitor input side has sliding average value-based algorithm 12 compared to fricton-tight average algorithm 11
Such power swing can be stabilized to a certain extent.Impact of the power swing to mixed energy storage system is reduced, energy-storage system is extended
Service life.
As the above analysis: the control strategy is relative to the control changed using time constant with energy-storage system residual capacity
System strategy has certain advantage, under the premise of protecting energy-storage system, can preferably maintain grid-connected power in grid-connected reference value, have
Conducive to the stabilization of power grids.
In conclusion the present invention is in the case where grid-connected reference power is given, it is defeated according to wind-powered electricity generation with fuzzy control principle
Power and the departure degree of grid-connected reference value select low-pass filtering time constant out, calculate simple, holding output power and follow tune
Spend target value；Mixed energy storage system power is allocated with the control strategy of supercapacitor priority task principle；Pass through
Sliding average value-based algorithm is connected to mixed energy storage system input side, for stabilizing spike and fluctuating toward the wind-powered electricity generation of renaturation, with cunning
Dynamic average value principle to stabilize target carry out it is secondary stabilize, for stabilizing spike and fluctuating toward renaturation wind power, extend energy storage
Lifetime of system；Energy-storage system is controlled by the way that quantity of power is changed into the magnitude of current, may be implemented its power handle up it is quick, quasi-
Really control improves dynamic performance.By implementing above-mentioned power distribution strategies, make mixed energy storage system can be in conditions permit
Under, preferential supercapacitor work can effectively stabilize the charge and discharge that wind power output power fluctuates and lithium battery is excessive
Task extends cycle life, the cost of mixed energy storage system is effectively reduced.While to energy-storage system protection, grid-connected function is maintained
Rate is in grid-connected target value or so.Its simulation result shows: the mixing storage stabilized for wind power output power proposed by the invention
Energy system control strategy avoids energy-storage system and excessively regulates and controls compared with Traditional control strategy, and grid-connected power maintains and mesh
Scale value or so.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Professional further appreciates that, in conjunction with disclosed in this invention each exemplary list for describing of embodiment
Member and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware
With the interchangeability of software, each exemplary composition and step are generally described according to function in the above description.This
A little functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Specially
Industry technical staff can use different methods to achieve the described function each specific application, but this realization is not
It is considered as beyond the scope of this invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention
And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it
Interior, then the invention is also intended to include including these modification and variations.
Claims (8)
1. a kind of for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that including wind power plant and mix
Close energy-storage system, wherein
The hybrid energy-storing is formed by lithium battery, supercapacitor, biphase rectification/inverter and the first, second DC/DC current transformer
System, the low-pressure side of the first DC/DC current transformer connect lithium battery, and the high-pressure side of the first DC/DC current transformer connects the 2nd DC/
The low-pressure side of DC current transformer, the first DC/DC current transformer is simultaneously in parallel with the supercapacitor, the 2nd DC/DC unsteady flow
Device high-pressure side is connected to biphase rectification/inverter DC side, and biphase rectification/inverter exchange side is connected in parallel on wind power plant outlet
Low-pass first order filter；
Charging-discharging controller, respectively with power grid, the low-pass first order filter, the first DC/DC current transformer and the 2nd DC/DC
Current transformer connection；
It is connected to the sliding average algorithm device of lithium battery and supercapacitor input side, when mixed energy storage system is run, the control
For device processed using wind power output power and grid-connected reference power as foundation, the charging-discharging controller calculates low pass filtered with fuzzy control
Wave time constant, Power Output for Wind Power Field are passed through after the low-pass first order filter, are stabilized by sliding average algorithm device
Target is controlled, and passes to DC/DC current transformer, and then control lithium battery and supercapacitor carry out power and handle up, finally handle
Power after stabilizing is sent into power grid.
2. as described in claim 1 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
Charging-discharging controller is stated wind power output power is carried out to stabilize control based on the first-order low-pass wave algorithm for becoming time constant, i.e., it is flat
The charge-discharge electric power of suppression are as follows:
In formula: Pwind(t) preceding power is filtered for t moment wind power；Pwind(t- Δ t) is last moment wind power through filtering
Power after wave；τ is time constant filter；
The time constant of low-pass first order filter is determined using fuzzy control, defines a new variable: wind power output power
Fluctuation degree P0(t), expression formula are as follows:
In formula: PrefIt (t) is grid-connected reference power, as the input x (t) of fuzzy control.
3. as claimed in claim 2 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
It states charging-discharging controller and wind power output power undulate quantity is divided into five grades, it is corresponding by fuzzy control output result selection
Low-pass filtering time constant.
4. as claimed in claim 3 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that root
Corresponding power distribution strategies are provided according to energy-accumulating medium residual capacity situation are as follows: power density is big, the super electricity that has extended cycle life
The preferential charge and discharge of container；It when lithium battery residual capacity is enough, is used for power and stabilizes, setting lithium battery, supercapacitor are surplus
Covolume amount Soc-bat、Soc-cap。
5. as claimed in claim 4 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
State power distribution strategies are as follows:
Work as PHESS(t) > 0 when, i.e., mixed energy storage system discharges, and defines different discharge conditions according to supercapacitor SOC variation:
Discharge condition 1:Soc-cap> 0.1, supercapacitor preferential discharge, lithium battery is failure to actuate；
Discharge condition 2:Soc-cap< 0.1, Soc-bat> 0.4, lithium battery electric discharge, supercapacitor does not work；
Discharge condition 3:Soc-bat< 0.4, then it does not work；
Work as PHESS(t)≤0 when, i.e., mixed energy storage system charges, and defines different charged states according to lithium battery SOC variation:
Charged state 1:Soc-bat> 0.8, supercapacitor charging；
Charged state 2:Soc-bat< 0.8, lithium battery charging.
6. as claimed in claim 5 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
Sliding average algorithm device is stated to be used for:
N time series PHESS(t+n Δ t) calculates the average value of multiple continuous m sequences, wherein the first of continuous m sequence
, it is the first item of original n sequencePHESS(t) to m PHESS(the sum of t+m Δ t) is divided by m；The Section 2 of continuous m sequences
PHESS(t+ Δ t) is the Section 2 of original n sequence to m+1 PHESS(the sum of t+ (m+1) Δ t) is divided by m；And so on, lithium electricity
The sliding average algorithm expression formula in pond and supercapacitor are as follows:
In formula: Preal-bat(t)、Preal-capIt (t) is respectively lithium battery of the t moment after sliding average algorithm process, super
Capacitor power；Pbat(t)、PcapIt (t) is lithium battery, supercapacitor function of the t moment without sliding average algorithm process
Rate.
7. as claimed in claim 6 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
Charging-discharging controller is stated using the two-way DC/DC chopper controller of Buck-Boost, and uses power outer ring, pair of current inner loop
Closed loop control mode.
8. as claimed in claim 7 for stabilizing the control equipment of the energy-storage system of wind power output power, which is characterized in that institute
Power outer ring is stated for maintaining the stabilization of output power, current inner loop given value is obtained by power divided by DC voltage, then
Given value of current value and detection electric current do deviation, by PI link, obtain modulation voltage, modulation voltage passes through SPWM, controlled
Signal, the control signal is for controlling two-way DC/DC chopper, to control lithium battery power output.
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| CN107134794B (en) * | 2017-05-28 | 2020-03-10 | 国网辽宁省电力有限公司 | Wind power stabilizing control method based on digital band elimination filter |
| CN108988372B (en) * | 2018-07-30 | 2021-11-30 | 内蒙古工业大学 | Power control method and device for hybrid energy storage system of direct-drive wind turbine generator |
| CN111900745A (en) * | 2020-07-17 | 2020-11-06 | 江苏科能电力工程咨询有限公司 | Hybrid energy storage frequency division coordination control system for stabilizing wind power fluctuation |
| CN111864798B (en) * | 2020-07-23 | 2021-12-28 | 南通大学 | Energy storage energy throughput implementation method in wind power integration forecast deviation real-time compensation |
| CN112003304B (en) * | 2020-09-02 | 2022-04-26 | 国网陕西省电力公司经济技术研究院 | Power fluctuation suppression and frequency modulation control method based on hybrid energy storage system |
| CN117977633A (en) * | 2024-03-06 | 2024-05-03 | 山东大学 | Method and system for controlling stabilizing wind power fluctuation of double-battery composite energy storage system |
| CN117895538B (en) * | 2024-03-14 | 2024-06-04 | 中国电建集团华东勘测设计研究院有限公司 | Wind power fluctuation stabilizing method based on hybrid energy storage fuzzy control |
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