CN103236708A - Wind electricity power stabilizing method based on hybrid energy storage - Google Patents

Wind electricity power stabilizing method based on hybrid energy storage Download PDF

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Publication number
CN103236708A
CN103236708A CN2013101540106A CN201310154010A CN103236708A CN 103236708 A CN103236708 A CN 103236708A CN 2013101540106 A CN2013101540106 A CN 2013101540106A CN 201310154010 A CN201310154010 A CN 201310154010A CN 103236708 A CN103236708 A CN 103236708A
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power
soc
energy
energy storage
storage
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CN103236708B (en
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邹见效
彭超
辛晓帅
徐红兵
张珍珍
戴碧蓉
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电子科技大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention provides a wind electricity power stabilizing method based on hybrid energy storage. According to the method, a power regulation value is calculated through the average SOC (state-of-charge) and the expected SOC of a hybrid energy storage system for revising the expected output power of a wind electricity field, so that the SOC of the hybrid energy storage system is considered in the wind electricity power stabilizing process, the occurrence of the overcharging and overdischarging conditions of the hybrid energy storage system is avoided, the requirements of the wind electricity field on the volume of the energy storage system are reduced, and the higher integral charging and discharging capability of the hybrid energy storage system is maintained. Meanwhile, the power of energy storage batteries and the power of super capacitors are directly and properly regulated according to the SOC of the energy storage batteries and the SOC of the super capacitors, the super capacitors preferentially respond the wind electricity power fluctuation stabilizing requirement, the SOC of the super capacitors is regulated in real time through the charging and discharging of the energy storage batteries, thus the charging and discharging times of the energy storage batteries are reduced, and the service life of the battery is prolonged.

Description

A kind of wind power based on hybrid energy-storing is stabilized method
Technical field
The invention belongs to wind energy turbine set hybrid energy-storing technical field, more specifically say, relate to a kind of wind power based on hybrid energy-storing and stabilize method.
Background technology
Along with wind-powered electricity generation is incorporated into the power networks on a large scale, its power fluctuation is more and more outstanding to the impact of electrical network.And the fast Absorption in short-term that energy-storage system has and the characteristics that release energy, can effectively remedy the shortcoming of wind-powered electricity generation power output intermittence, fluctuation, therefore the configuration energy-storage system has become one of effective means of stabilizing the wind-powered electricity generation output-power fluctuation in wind power-generating grid-connected system.By the mixed energy storage system that super capacitor and energy-storage battery are formed, remedied the deficiency of single energy storage technology, therefore increasing wind energy turbine set begins to dispose mixed energy storage system.
Mixed energy storage system can compensate the fluctuation composition of a certain special frequency channel in the Power Output for Wind Power Field, thereby the fluctuation of realization wind power is stabilized.The energy storage setting power is divided into frequent fluctuation part and smooth, is born by super capacitor and energy-storage battery respectively, can realize stabilizing the quick response of demand.The mixed energy storage system setting power can be obtained through filter by the real-time power output of wind energy turbine set.
Fig. 1 is that prior art adopts the low-pass filtering mode to carry out the control flow chart that wind power is stabilized.As shown in Figure 1, the wind-powered electricity generation realtime power P of wind energy turbine set output WfDraw power P after stabilizing through stabilizing low-pass filtering Out, hybrid energy-storing setting power P Hess_refBy the power P after stabilizing OutDeduct wind-powered electricity generation realtime power P WfSubtract each other and obtain.Sampling distributes low-pass filtering, extracts hybrid energy-storing setting power P Hess_refMedium and low frequency power section and process limit value link make energy-storage battery setting power P BatIn its limit of power, it is hybrid energy-storing setting power P that super capacitor will be born the residue HFS Hess_refDeduct energy-storage battery setting power P Bat, the super capacitor setting power P that obtains SC
With hybrid energy-storing setting power P Hess_refBeing divided into frequent fluctuation partly is P SCWith smooth P Bat, born by super capacitor and energy-storage battery respectively, can realize stabilizing the quick response of demand.
Present research concentrates on and how to utilize limited energy storage capacity to realize that power stabilizes, and the seldom coordination between the whole charging and discharging capabilities of taking into account system and the different energy storage device.How the energy storage device at different charge-discharge characteristics carries out power division, avoids occurring energy storage device and fills deeply that to put phenomenon be the key that realizes that the hybrid energy-storing wind power is stabilized.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of wind power based on hybrid energy-storing to stabilize method at the mixed energy storage system of being formed by super capacitor and energy-storage battery, distribute with the power optimization of having realized mixed energy storage system, avoided the super-charge super-discharge of energy storage device simultaneously, increased the service life.
For realizing above purpose, the wind power that the present invention is based on hybrid energy-storing is stabilized method, it is characterized in that, may further comprise the steps:
(1), the optimal control layer establishs and enforce the power optimization strategy of energy-storage system, for mixed energy storage system provides setting power P Hess_ref
1.1), the wind-powered electricity generation realtime power P of wind energy turbine set WfStabilize after low pass filter filtering rejects wherein high fdrequency component through wind-powered electricity generation, obtain injecting the desired output power P after the stabilizing of electrical network Out_exp
1.2), according to the average SOC of mixed energy storage system and the expectation SOC, calculate power adjustment value P Adjust:
P adjust=(SOC avg-SOC avg_ exp)×K Hess
Wherein, K HessBe proportionality coefficient, relevant with the capacity that the mixed energy storage system energy storage is set, the capacity of setting is more big, and its value is more little, and vice versa;
The average SOC of mixed energy storage system and expectation SOC are respectively:
SOC avg = SOC Bat × Q Bat + SOC SC × Q SC Q Bat + Q SC
SOC avg _ exp = SOC Bat _ exp × Q Bat + SOC SC _ exp × Q SC Q Bat _ exp + Q SC _ exp ;
Wherein, Q Bat, Q SCBe divided into energy-storage battery weights and super capacitor weights in the mixed energy storage system, in the mixed energy storage system storage, the capacity of energy-storage battery and super capacitor determines that capacity is more big, and its value is more little, and vice versa; SOC BatBe the current state-of-charge value (SOC) of energy-storage battery, SOC SCCurrent state-of-charge value (SOC), SOC for super capacitor Bat_exp, SOC SC_expBe respectively the best SOC value that energy-storage battery and super capacitor are set;
Power adjustment value P AdjustProcess SOC exports after stabilizing low pass filter filtering rejecting high fdrequency component wherein;
1.3), with step 1.1) the desired output power P that obtains Out_expWith step 1.2) the power adjustment value P that obtains AdjustCarry out addition, obtain wind energy turbine set output setting power P Out_ref
Wind energy turbine set is exported setting power P Out_refDeduct wind-powered electricity generation realtime power P WfSubtract each other and obtain mixed energy storage system setting power P Hess_ref
(2), coordinate key-course on the basis of the charge-discharge characteristic of considering super capacitor and energy-storage battery, establish and enforce the power distribution strategies of mixed energy storage system, realize the coordination control of two kinds of energy storage device SOC;
2.1), mixed energy storage system setting power P Hess_refBy distributing low-pass filtering extraction low frequency part P ' wherein Hess_ref
2.2), at first calculate and regulate power Δ P SC:
ΔP SC=(SOC SC-SOC SC_exp)×K SC
Wherein, K SCBe proportionality coefficient, more big strength of adjustment is more big, and vice versa;
Then, to regulating power Δ P SCCarry out low-pass filtering, filtering interfering, adjusted power Δ P ' SC, again according to following table, obtain power adjustment value P Adjust_SC:
2.3), with low frequency part P ' Hess_refDeduct power adjustment value P Adjust_SC, obtain the setting power P ' of energy-storage battery Bat
2.4), mixed energy storage system setting power P Hess_refCarry out secondary distribution, obtain final energy-storage battery setting power P BatAnd super capacitor setting power P SC:
Mixed energy storage system setting power P Hess_refDeduct the setting power P ' of the energy-storage battery after limit value is handled BatObtain super capacitor setting power P ' SC, super capacitor setting power P ' SCHandle through limit value, obtain final super capacitor setting power P SC
Mixed energy storage system setting power P Hess_refDeduct final super capacitor setting power P SC, carry out limit value then and handle, obtain final energy-storage battery setting power P Bat
Wherein, limit value is handled when referring to that the value imported is greater than setting threshold, and output valve is setting threshold, and other situations are input value;
(3), with final energy-storage battery setting power P BatAnd super capacitor setting power P SCGo to control discharging and recharging of energy-storage battery, super capacitor, the wind power of wind energy turbine set is stabilized.
The object of the present invention is achieved like this:
The wind power that the present invention is based on hybrid energy-storing is stabilized method by the average SOC of mixed energy storage system and is expected that SOC calculates the desired output power that power adjustment value is revised wind energy turbine set, thereby the SOC of mixed energy storage system is considered that wind power stabilizes in the process, make the SOC of mixed energy storage system remain on zone of reasonableness, be near the average expectation SOC, avoid the generation of mixed energy storage system super-charge super-discharge situation, reduce the requirement of wind energy turbine set to the energy-storage system capacity, kept the whole higher charging and discharging capabilities of mixed energy storage system.
Simultaneously, the energy-storage battery of SOC and super capacitor according to energy-storage battery and super capacitor directly carry out suitable power adjustments, the demand that the fluctuation of super capacitor preferential answering wind power is stabilized, its SOC discharges and recharges real-time adjustment by energy-storage battery, discharge and recharge number of times to reduce energy-storage battery, prolong battery useful life.And the SOC of the two is all drawn close to the SOC of the best, avoided the generation of super-charge super-discharge situation, thereby keep the energy-storage system operate as normal, and prolong the useful life of energy-storage battery.
Description of drawings
Fig. 1 is that Fig. 1 is that prior art adopts the low-pass filtering mode to carry out the control flow chart that wind power is stabilized;
Fig. 2 is that the wind power that the present invention is based on hybrid energy-storing is stabilized a kind of embodiment workflow diagram of method;
Fig. 3 is optimal control layer structure chart shown in Figure 2;
Fig. 4 is coordination key-course structure chart shown in Figure 2;
Fig. 5 is the theory diagram of secondary distribution module;
Fig. 6 is that wind-powered electricity generation is stabilized expectation curve figure and the effect contrast figure is stabilized in actual output;
Fig. 7 is the average SOC of mixed energy storage system and setting power comparison diagram;
Fig. 8 is wind-powered electricity generation power output spectrogram;
Fig. 9 is SOC and the setting power comparison diagram of energy-storage battery;
Figure 10 is SOC and the setting power comparison diagram of super capacitor;
Figure 11 is the SOC probability distribution graph of super capacitor and energy-storage battery.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Fig. 2 is that the wind power that the present invention is based on hybrid energy-storing is stabilized a kind of embodiment workflow diagram of method.
In the present embodiment, as shown in Figure 2, the wind power that the present invention is based on hybrid energy-storing is stabilized method sampling hierarchy, comprise the optimal control layer and coordinate key-course, the power optimization of realizing mixed energy storage system distributes, and avoids the super-charge super-discharge of energy-storage battery and super capacitor, increases the service life.
1, optimal control layer
The optimal control layer is established and enforce the power optimization strategy of energy-storage system, for mixed energy storage system provides setting power P Hess_refIn the present embodiment, as shown in Figure 3, the optimal control layer comprises that stabilizing low pass filter, optimal controller and limit value manager module forms.In the optimal control layer, the wind-powered electricity generation realtime power P of wind energy turbine set WfThrough stabilizing after low pass filter filtering rejects wherein high fdrequency component, obtain injecting the desired output power P after the stabilizing of electrical network Out_exp
Optimal controller calculates power adjustment value P according to the average SOC of mixed energy storage system and expectation SOC Adjust, power adjustment value P AdjustProcess SOC exports after stabilizing low pass filter filtering rejecting high fdrequency component wherein, and the SOC of hybrid energy-storing is remained in the OK range.
Optimal controller is the important step that improves the whole charging and discharging capabilities of mixed energy storage system.In each control cycle of mixed energy storage system, respectively the average SOC of mixed energy storage system and expectation SOC are compared, after the proportional controller effect, obtain power adjustment value P Adjust, reject radio-frequency head by low pass filter again.
The optimal control layer is by power adjustment value P AdjustThe desired output power P of electrical network is injected in revision Out_expRealize keeping energy-storage system SOC within the specific limits.In current control cycle, when the average SOC of mixed energy storage system is higher than expectation SOC service area, revised wind energy turbine set output setting power P Out_refTo raise, the Power Output for Wind Power Field desired value increases, and will promote mixed energy storage system discharge or minimizing charge volume to finish and stabilize target, gets back to best SOC service area to guarantee mixed energy storage system; Otherwise, when the average SOC of mixed energy storage system is lower than expectation SOC service area, revised wind energy turbine set output setting power P Out_refTo reduce, the Power Output for Wind Power Field desired value reduces, and with promoting mixed energy storage system to absorb the surplus energy of wind-powered electricity generation or reducing to discharge to finish and stabilize target, gets back to best SOC service area to guarantee mixed energy storage system.
With the desired output power P Out_expWith power adjustment value P AdjustCarry out addition, obtain wind energy turbine set output setting power P Out_refWind energy turbine set is exported setting power P Out_refDeduct wind-powered electricity generation realtime power P WfSubtract each other and obtain mixed energy storage system setting power P Hess_ref.
The limit value manager considers that the maximum of mixed energy storage system discharges and recharges power, sets minimax power, as mixed energy storage system setting power P Hess_refDuring greater than maximum or less than minimum value, then the limit value manager is defined as maximum or minimum value with its value, the mixed energy storage system setting power P of all the other limit value manager output inputs Hess_ref, avoiding occurring the situation that setting power exceeds the mixed energy storage system ability, thereby prolong energy-storage system useful life.
Optimal control layer algorithm
The wind-powered electricity generation realtime power P of wind energy turbine set WfStabilize after low pass filter filtering rejects wherein high fdrequency component through wind-powered electricity generation, obtain injecting the desired output power P after the stabilizing of electrical network Out_exp:
P out _ exp = 1 s T 1 + 1 P wf - - - ( 1 )
After adding the power adjustments link, wind energy turbine set output setting power P Out_refFor:
P out _ ref = P wf × 1 s T 1 + 1 + P adjust × 1 s T 2 + 1 - - - ( 2 )
Wherein:
P adjust=(SOC avg-SOC avg_exp)×K Hess???(3)
SOC Bat_exp, SOC SC_expBe respectively the best SOC value that energy-storage battery and super capacitor are set, K HessBe proportionality coefficient, relevant with the capacity that the mixed energy storage system energy storage is set, the capacity of setting is more big, and its value is more little, and vice versa.
In the present embodiment, wind-powered electricity generation is stabilized the filter factor T of low pass filter 1Stabilize the filter factor T of low pass filter with SOC 2Equate to be that cut-off frequency is identical, be made as T
Then
P out _ ref = 1 sT + 1 ( P wf + P adjust ) - - - ( 4 )
By formula (4) as can be known, wind energy turbine set output setting power power P Out_refAt stack power adjustment value P AdjustAfter, introducing does not surpass The frequency fluctuation composition that Hz is above.
Can be got mixed energy storage system setting power P by law of conservation of energy Hess_ref
P Hess_ref=P out_ref-P wf???(5)
By formula (4), (5), can get
P Hess _ ref = 1 sT + 1 P wf + P adjust - P wf - - - ( 6 )
Mixed energy storage system increases power
ΔP HESS_ref=P adjust???(7)
As seen, by adding power adjustment value P Adjust, revision wind energy turbine set output setting power P Out_ref, reach the SOC dynamic adjustments mixed energy storage system setting power P according to mixed energy storage system Hess_ref, the whole SOC of mixed energy storage system is optimized.
2, coordinate key-course
Coordinate key-course on the basis of the charge-discharge characteristic of considering super capacitor and energy-storage battery, establish and enforce the power distribution strategies of mixed energy storage system, realize the coordination control of two kinds of energy storage device SOC.
In the present embodiment, as shown in Figure 4, coordinate key-course and be used for given mixed energy storage system setting power P Hess_refBe to carry out power division between energy-storage battery and the super capacitor at different energy-storage units, by distributing low pass filter, tuning controller and limit value manager to form.Single use low-pass filtering mode is carried out the extremely unbalanced phenomenon of SOC that power division can cause energy-storage battery and super capacitor, by adding tuning controller, between super capacitor and energy-storage battery, carry out suitable power adjustments, can impel the SOC of the two to draw close to optimum SOC.The secondary distribution module makes final setting power satisfy the energy-storage units index of correlation by the original allocation value is carried out limit value, and the power breach that occurs behind the limit value is carried out secondary distribution, to minimize the tracking difference with hybrid energy-storing.
2.1, distribute low pass filter
Mixed energy storage system setting power P Hess_refBy distributing low pass filter to carry out low-pass filtering extraction low frequency part P ' wherein Hess_ref
2.2, tuning controller
This module passes through to regulate the setting power of energy-storage battery, under the prerequisite of the charging and discharging capabilities that preferentially guarantees super capacitor, and the dump energy of balanced energy-storage battery and super capacitor.In power division, super capacitor is born the frequent fluctuation part in the hybrid energy-storing setting power value because this part power changes greatly, can give full play to the high-power fan-out capability of super capacitor strong, have extended cycle life, advantage that response speed is fast.And general energy-storage battery is for the quick variation that discharges and recharges power, tend to causing irreversible infringement its useful life, thereby bear smooth in the setting power by energy-storage battery, avoid or reduce by energy-storage battery go to bear since super capacitor bear discharge and recharge power, can reduce and frequently discharge and recharge the partial circulating charge and discharge phenomena that causes, be of value to the useful life that prolongs whole energy-storage system, improve the economy of energy storage technology.
In the tuning controller, power adjustment value P Adjust_SCSize determined by the SOC of energy-storage battery and super capacitor.In the control cycle of each mixed energy storage system, best SOC and the current SOC of super capacitor compared, through the proportional controller effect, again by low-pass filtering, adjusted amount initial value is regulated power Δ P ' SCWhether the state of considering energy-storage battery this moment is fit to participate in regulating, and adds Rule of judgment.As Δ P ' SCFor just, when namely super capacitor SOC is in a high position, need discharge adjustment, check the energy-storage battery extra charge volume of whether having the ability to accept this moment; As Δ P ' SCFor negative, when namely super capacitor SOC is in low level, need charging adjustment, check whether energy-storage battery has the ability to accept extra discharge capacity this moment, if meet the demands, power adjustment value P then Adjust_SCBe set to Δ P ' SCOtherwise, power adjustment value P Adjust_SCBe set to 0.
2.3, the secondary distribution module
With low frequency part P ' Hess_refDeduct power adjustment value P Adjust_SC, obtain the setting power P ' of energy-storage battery BatIt is the initial power apportioning cost of energy-storage battery.
As shown in Figure 5, the setting power P ' of energy-storage battery BatThrough the limit value module, guarantee that its setting power is in the limit of power of energy-storage battery earlier; Mixed energy storage system setting power P Hess_refDeduct the setting power P ' of the energy-storage battery after limit value is handled BatObtaining the super capacitor setting power is original allocation value P ' SC, through the limit value manager processes, obtain final super capacitor setting power P SC
Because super capacitor set point P SCGet P ' by the limit value manager processes SCWith P SCThe difference that may exist can cause that hybrid energy-storing is actual to discharge and recharge power and set point there are differences, so be necessary to carry out secondary distribution, i.e. mixed energy storage system setting power P Hess_refDeduct final super capacitor setting power P SC, carry out limit value then and handle, obtain final energy-storage battery setting power P Bat, the power output that makes mixed energy storage system is the tracing energy-storage set point as far as possible, reaches to stabilize the outer minimum power of back target.
At last, with final energy-storage battery setting power P BatAnd super capacitor setting power P SCGo to control discharging and recharging of energy-storage battery, super capacitor, the wind power of wind energy turbine set is stabilized.
Example
In the mixed energy storage system that applies the present invention to form with super capacitor and vanadium oxide reduction flow battery (VRB).
Because the most fluctuation of wind-powered electricity generation more than 0.01Hz, is stabilized low pass filter cutoff frequency and is taken as 0.01Hz.The wind-powered electricity generation realtime power P of wind energy turbine set WfAnd the desired output power P after stabilizing low-pass filtering Out_expShown in accompanying drawing 6 (a) (1000 seconds time).
1, wind-powered electricity generation is stabilized the control effect
The present invention and prior art adopt the low-pass filtering mode to carry out wind energy turbine set real output that wind power stabilizes shown in accompanying drawing 6 (b), can find out obviously that prior art adopts the output power curve of method after 700 seconds of low-pass filtering big ups and downs to occur.Its main cause is the charging and discharging capabilities deficiency of mixed energy storage system, and causing the mixed energy storage system frequency of can not handling up is the fluctuation composition of 0.02Hz.The average SOC of the mixed energy storage system of two kinds of methods the later stage all less than 0.5, shown in accompanying drawing 7 (a), and the setting power of mixed energy storage system is significantly less than the method for prior art among the present invention, shown in accompanying drawing 7 (b), make the discharge power of mixed energy storage system reduce, charge power increases, thereby improve the residue carrying capacity of mixed energy storage system.Located at 900 seconds, the average SOC of the mixed energy storage system of the inventive method is 0.51 and the method for prior art is 0.3, and there is obvious gap in the two, and the optimal control layer algorithm that the inventive method is described has good effect regulating the mixed energy storage system charging and discharging capabilities.
In order to verify the filter effect of two kinds of methods, make P WfPower curve after the process low-pass filtering is for expectation power, to the P of the inventive method, art methods Out_expAnd expectation power carries out fft analysis.As shown in Figure 8, the inventive method and expectation power, illustrates that the present invention has finished and expect that wind-powered electricity generation stabilizes effect greater than the interval basic match of 0.02Hz and all be tending towards 0 in frequency; And the method for prior art obviously still has many places much larger than 0 0.02~0.12, illustrates that its wind-powered electricity generation power output after stabilizing and the gross power of energy-storage system output still contain the above fluctuation composition of more 0.02Hz.
2, hybrid energy-storing distribution effects
Analysis is at 700-1000 in second, the SOC of battery and super capacitor and the situation of change of setting power.
Accompanying drawing 9 (a) is the SOC comparison diagram of energy-storage battery, observe as can be known, the SOC of energy-storage battery is in rising trend in two kinds of methods, but the situation of minimum SOC20% has appearred remaining on for a long time for three times in the method for prior art, force energy management that the generated output of battery is restricted to 0, shown in accompanying drawing 9 (b), cause energy-storage system can't finish discharge and stabilize task.In the time of 760 seconds to 960 seconds, energy-storage battery is in lower SOC interval, and the setting power of the inventive method increases the chance of energy-storage battery storing energy generally less than the method for prior art at this moment, and its SOC increases the method apparently higher than prior art; And after 960 seconds, when the SOC of energy-storage battery was in a high position greater than 0.65 in the inventive method, its setting power impelled SOC to draw close to the optimum SOC0.55 that arranges again apparently higher than the method for prior art.This shows that the inventive method is regulated very effective to the SOC of energy-storage battery.
State-of-charge for super capacitor, shown in accompanying drawing 10 (a), art methods SOC in 90.7% time is in below 0.6, its ability of feeding back corresponding vacancy energy obviously is in weak tendency, and repeatedly touch the end to minimum SOC10% place, in order to prevent that phenomenon from appearring putting in super capacitor, its setting power can only be restricted to 0, shown in accompanying drawing 10 (b).
Accompanying drawing 11 is SOC probability distribution graph of super capacitor and energy-storage battery, the SOC that can find energy-storage battery and super capacitor in the inventive method 0.4~0.8 interval in probability maximum, the absorption excess energy of mixed energy storage system and to feed back the ability of corresponding vacancy energy the most balanced herein.Illustrate that the classification optimisation strategy can make the SOC of super capacitor and energy-storage battery draw close to the optimum SOC that arranges effectively, and the state-of-charge of mixed energy storage system is stabilized in certain scope, effectively avoid mixed energy storage system to fill deeply and put.
By simulation result as can be known, a kind of wind power based on hybrid energy-storing of the present invention is stabilized method and can kept the wind power fluctuation to stabilize under the constant situation of effect, guarantee that mixed energy storage system integral body charges and discharge ability, take full advantage of the fast and energy-storage battery characteristics capacious of super capacitor reaction, keep mixed energy storage system SOC in OK range, avoid super capacitor and energy-storage battery super-charge super-discharge.
Advantage of the present invention is:
According to wind energy turbine set to stabilizing the performance requirement of power fluctuation, the design optimization key-course makes mixed energy storage system can finish the stabilizing of Power Output for Wind Power Field fluctuation, and can keep its whole higher charging and discharging capabilities, improves the effectively time of operation.
2. according to super capacitor in the mixed energy storage system and energy-storage battery SOC state and charge-discharge characteristic separately, key-course is coordinated in design, the optimization of finishing the setting power that the optimal control layer is provided distributes, the SOC that realizes super capacitor and energy-storage battery coordinates control and to the quick tracking of setting power, avoided simultaneously filling deeply of energy storage device put, increased the service life.
Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (3)

1. the wind power based on hybrid energy-storing is stabilized method, it is characterized in that, may further comprise the steps:
(1), the optimal control layer establishs and enforce the power optimization strategy of energy-storage system, for mixed energy storage system provides setting power P Hess_ref
1.1), the wind-powered electricity generation realtime power P of wind energy turbine set WfThrough stabilizing after low pass filter filtering rejects wherein high fdrequency component, obtain injecting the desired output power P after the stabilizing of electrical network Out_exp
1.2), according to the average SOC of mixed energy storage system and the expectation SOC, calculate power adjustment value P Adjust:
P adjust=(SOC avg-SOC avg_exp)×K Hess
The average SOC of mixed energy storage system and expectation SOC are respectively:
SOC avg = SOC Bat × Q Bat + SOC SC × Q SC Q Bat + Q SC
SOC avg _ exp = SOC Bat _ exp × Q Bat + SOC SC _ exp × Q SC Q Bat _ exp + Q SC _ exp ;
Wherein, Q Bat, Q SCBe divided into energy-storage battery weights and super capacitor weights in the mixed energy storage system, in the mixed energy storage system storage, the capacity of energy-storage battery and super capacitor determines that capacity is more big, and its value is more little, and vice versa; SOC BatBe the current state-of-charge value (SOC) of energy-storage battery, SOC SCCurrent state-of-charge value (SOC), SOC for super capacitor Bat_exp, SOC SC_expBe respectively the best SOC value that energy-storage battery and super capacitor are set;
Power adjustment value P AdjustProcess SOC exports after stabilizing low pass filter filtering rejecting high fdrequency component wherein;
1.3), with step 1.1) the desired output power P that obtains Out_expWith step 1.2) the power adjustment value P that obtains AdjustCarry out addition, obtain wind energy turbine set output setting power P Out_ref
Wind energy turbine set is exported setting power P Out_refDeduct wind-powered electricity generation realtime power P WfSubtract each other and obtain mixed energy storage system setting power P Hess_ref
(2), coordinate key-course on the basis of the charge-discharge characteristic of considering super capacitor and energy-storage battery, establish and enforce the power distribution strategies of mixed energy storage system, realize the coordination control of two kinds of energy storage device SOC;
2.1), mixed energy storage system setting power P Hess_refBy distributing low-pass filtering extraction low frequency part P ' wherein Hess_ref
2.2), at first calculate and regulate power Δ P SC:
ΔP SC=(SOC SC-SOC SC_exp)×K SC
Wherein, K SCBe proportionality coefficient, more big strength of adjustment is more big, and vice versa;
Then, to regulating power Δ P SCCarry out low-pass filtering, filtering interfering, adjusted power Δ P ' SC, again according to following table, obtain power adjustment value P Adjust_SC:
2.3), with low frequency part P ' Hess_refDeduct power adjustment value P Adjust_SC, obtain the setting power P ' of energy-storage battery Bat
2.4), mixed energy storage system setting power P Hess_refCarry out secondary distribution, obtain final energy-storage battery setting power P BatAnd super capacitor setting power P SC:
Mixed energy storage system setting power P Hess_refDeduct the setting power P ' of the energy-storage battery after limit value is handled BatObtain super capacitor setting power P ' SC, super capacitor setting power P ' SCHandle through limit value, obtain final super capacitor setting power P SC
Mixed energy storage system setting power P Hess_refDeduct final super capacitor setting power P SC, carry out limit value then and handle, obtain final energy-storage battery setting power P Bat
Wherein, limit value is handled when referring to that the value imported is greater than setting threshold, and output valve is setting threshold, and other situations are input value;
(3), with final energy-storage battery setting power P BatAnd super capacitor setting power P SCGo to control discharging and recharging of energy-storage battery, super capacitor, the wind power of wind energy turbine set is stabilized.
2. wind power according to claim 1 is stabilized method, it is characterized in that, in step (1), described wind-powered electricity generation is stabilized low pass filter, SOC, and to stabilize the cut-off frequency of low pass filter identical, is 0.01Hz.
3. wind power according to claim 1 is stabilized method, it is characterized in that, and in step (1), described mixed energy storage system setting power P Hess_refAlso have through limit value and handle namely:
The limit value manager considers that the maximum of mixed energy storage system discharges and recharges power, sets minimax power, as mixed energy storage system setting power P Hess_refDuring greater than maximum or less than minimum value, then the limit value manager is defined as maximum or minimum value with its value, the mixed energy storage system setting power P of all the other limit value manager output inputs Hess_ref, avoiding occurring the situation that setting power exceeds the mixed energy storage system ability, thereby prolong energy-storage system useful life.
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