CN103236708B - 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
CN103236708B
CN103236708B CN201310154010.6A CN201310154010A CN103236708B CN 103236708 B CN103236708 B CN 103236708B CN 201310154010 A CN201310154010 A CN 201310154010A CN 103236708 B CN103236708 B CN 103236708B
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power
soc
energy
energy storage
storage
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CN103236708A (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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    • Y02E10/763
    • Y02E10/766
    • 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 grid-connected on a large scale, its power fluctuation is more and more outstanding to the impact of electrical network.And the feature that absorbs fast and release energy in short-term that energy-storage system has, can effectively make up the shortcoming of wind power output power intermittence, fluctuation, therefore in wind power-generating grid-connected system, configuring energy-storage system has become one of effective means of stabilizing wind power output power fluctuation.The mixed energy storage system being made up of super capacitor and energy-storage battery, has made up the deficiency of single energy storage technology, and therefore increasing wind energy turbine set starts to configure mixed energy storage system.

Mixed energy storage system can compensate the fluctuation composition of a certain special frequency channel in Power Output for Wind Power Field, stabilizes thereby realize wind power fluctuation.Energy storage setting power is divided into frequent fluctuation part and smooth, is born by super capacitor and energy-storage battery respectively, can realize the quick response to stabilizing demand.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 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 the 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 also makes energy-storage battery setting power P through limit value link batin its limit of power, it is hybrid energy-storing setting power P that super capacitor will be born residue HFS hess_refdeduct energy-storage battery setting power P bat, the super capacitor setting power P obtaining sC.

By hybrid energy-storing setting power P hess_refbeing divided into frequent fluctuation part is P sCwith smooth P bat, born by super capacitor and energy-storage battery respectively, can realize the quick response to stabilizing demand.

Current research concentrates on and how to utilize limited energy storage capacity to realize power to stabilize, and the seldom coordination between taking into account system entirety charging and discharging capabilities and different energy storage device.How to carry out power division for the energy storage device of different charge-discharge characteristics, avoid occurring that energy storage device filled that to put phenomenon be to realize the key that hybrid energy-storing wind power is stabilized deeply.

Summary of the invention

The object 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 for the mixed energy storage system being formed by super capacitor and energy-storage battery, distribute with the power optimization of having realized mixed energy storage system, the super-charge super-discharge of simultaneously having avoided energy storage device, increases the service life.

For realizing above object, the wind power that the present invention is based on hybrid energy-storing is stabilized method, it is characterized in that, comprises the following steps:

(1), optimal control layer establishs and enforces 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 low pass filter filtering through wind-powered electricity generation and reject after high fdrequency component wherein, 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 expect SOC, calculate power adjustment value P adjust:

P adjust=(SOC avg-SOC avg_exp)×K Hess

Wherein, K hessfor proportionality coefficient, relevant with the capacity that mixed energy storage system energy storage is set, the capacity of setting is larger, and its value is less, 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 mixed energy storage system, according in mixed energy storage system storage, the capacity of energy-storage battery and super capacitor is definite, and capacity is larger, and its value is less, and vice versa; SOC batfor the current state-of-charge value (SOC) of energy-storage battery, SOC sCfor the current state-of-charge value (SOC) of super capacitor, SOC bat_exp, SOC sC_expbe respectively the best SOC value that energy-storage battery and super capacitor are set;

Power adjustment value P adjuststabilize after high fdrequency component is wherein rejected in low pass filter filtering and export through SOC;

1.3), by step 1.1) the desired output power P that obtains out_expwith step 1.2) the power adjustment value P that obtains adjustbe added, obtain wind energy turbine set output setting power P out_ref;

Wind energy turbine set is exported to setting power P out_refdeduct wind-powered electricity generation realtime power P wf, obtain mixed energy storage system setting power P hess_ref;

(2), coordinate key-course on the basis of 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_refextract low frequency part P ' wherein by distributing low-pass filtering hess_ref;

2.2), first calculate regulating power Δ P sC:

ΔP SC=(SOC SC-SOC SC_exp)×K SC

Wherein, K sCfor proportionality coefficient, larger strength of adjustment is larger, and vice versa;

Then, to regulating power Δ P sCcarry out low-pass filtering, filtering interfering, adjusted power Δ P ' sC, then according to following table, obtain power adjustment value P adjust_SC:

2.3), by 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 final super capacitor setting power P sC:

Mixed energy storage system setting power P hess_refdeduct the setting power P ' of limit value energy-storage battery after treatment batobtain super capacitor setting power P ' sC, super capacitor setting power P ' sCthrough limit value processing, obtain final super capacitor setting power P sC;

Mixed energy storage system setting power P hess_refdeduct final super capacitor setting power P sC, then carry out limit value processing, obtain final energy-storage battery setting power P bat;

Wherein, limit value processing refers to when the value of input 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 final 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 power adjustment value and revise the desired output power of wind energy turbine set, thereby the SOC of mixed energy storage system is considered to wind power stabilizes in process, make the SOC of mixed energy storage system remain on zone of reasonableness, be near 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 energy storage system capacity, maintained the charging and discharging capabilities that mixed energy storage system entirety is higher.

Simultaneously, according to the SOC of energy-storage battery and super capacitor, energy-storage battery and super capacitor are directly carried out to suitable power adjustments, the super capacitor preferential answering wind power demand of stabilizing that fluctuates, its SOC discharges and recharges real-time adjustment by energy-storage battery, discharge and recharge number of times to reduce energy-storage battery, extend battery.And the SOC of the two is all drawn close to best SOC, avoided the generation of super-charge super-discharge situation, normally work thereby maintain energy-storage system, and extend the useful life of energy-storage battery.

Brief description of the drawings

Fig. 1 is that Fig. 1 is that prior art adopts 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 the layer of optimal control shown in Fig. 2 structure chart;

Fig. 4 coordinates key-course structure chart shown in Fig. 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 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 power output power 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.Requiring particular attention is that, in the following description, in the time that perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are 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 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

Optimal control layer is established and enforced the power optimization strategy of energy-storage system, for mixed energy storage system provides setting power P hess_ref.In the present embodiment, as shown in Figure 3, optimal control layer comprises stabilizes low pass filter, optimal controller and limit value manager module composition.In optimal control layer, the wind-powered electricity generation realtime power P of wind energy turbine set wfreject after high fdrequency component wherein through stabilizing low pass filter filtering, obtain injecting the desired output power P after the stabilizing of electrical network out_exp.

Optimal controller is according to the average SOC of mixed energy storage system and expect SOC, calculates power adjustment value P adjust, power adjustment value P adjuststabilize after high fdrequency component is wherein rejected in low pass filter filtering and export through SOC, make the SOC of hybrid energy-storing remain in OK range as far as possible.

Optimal controller is the important step that improves mixed energy storage system entirety charging and discharging capabilities.In each control cycle of mixed energy storage system, respectively average mixed energy storage system SOC and expectation SOC are compared, after proportional controller effect, obtain power adjustment value P adjust, then reject radio-frequency head by low pass filter.

Optimal control layer is by power adjustment value P adjustthe desired output power P of electrical network is injected in revision out_exprealize and maintain energy-storage system SOC within the specific limits.In current control cycle, when the average SOC of mixed energy storage system is higher than expecting when SOC service area, revised wind energy turbine set output setting power P out_refto raise, Power Output for Wind Power Field desired value increases, and promotions mixed energy storage system electric discharge or minimizing charge volume is completed and stabilizes target, to ensure that mixed energy storage system gets back to best SOC service area; Otherwise, when the average SOC of mixed energy storage system is lower than expecting when SOC service area, revised wind energy turbine set output setting power P out_refto lower, Power Output for Wind Power Field desired value reduces, and will promote mixed energy storage system absorb the surplus energy of wind-powered electricity generation or reduce and discharged and stabilize target, to ensure that mixed energy storage system gets back to best SOC service area.

By desired output power P out_expwith power adjustment value P adjustbe added, obtain wind energy turbine set output setting power P out_ref; Wind energy turbine set is exported to 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.

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_refwhen being greater than maximum or being less than minimum value, its value is defined as maximum or minimum value by limit value manager, the mixed energy storage system setting power P of all the other limit value manager output inputs hess_ref, to avoid occurring that setting power exceeds the situation of mixed energy storage system ability, thereby extend energy-storage system useful life.

Optimal control layer algorithm

The wind-powered electricity generation realtime power P of wind energy turbine set wfstabilize low pass filter filtering through wind-powered electricity generation and reject after high fdrequency component wherein, obtain injecting the desired output power P after the stabilizing of electrical network out_exp:

Add after 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 hessfor proportionality coefficient, relevant with the capacity that mixed energy storage system energy storage is set, the capacity of setting is larger, and its value is less, 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

?

P out _ ref = 1 sT + 1 ( P wf + P adjust ) - - - ( 4 )

From formula (4), wind energy turbine set output setting power power P out_refat stack power adjustment value P adjustafter, do not introduce and exceed above frequency fluctuation composition.

Can be obtained 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 obtain

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)

Visible, 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, mixed energy storage system entirety SOC is optimized.

2, coordinate key-course

Coordinate key-course on the basis of 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 between energy-storage battery and super capacitor, to carry out power division 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 power division and can cause the extremely unbalanced phenomenon of SOC of 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.Secondary distribution module, by original allocation value is carried out to limit value, makes final setting power meet energy-storage units index of correlation, and the power notch occurring after limit value is carried out to secondary distribution, to minimize and the tracking difference of 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, by regulating the setting power of energy-storage battery, is preferentially ensureing under the prerequisite of charging and discharging capabilities of super capacitor the dump energy of balanced energy-storage battery and super capacitor.In power division, super capacitor is born the frequent fluctuation part in hybrid energy-storing setting power value, because this Partial Power changes greatly, can give full play to the high-power fan-out capability of super capacitor strong, have extended cycle life, the advantage of fast response time.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 the smooth in setting power by energy-storage battery, avoid or reduce to be gone to bear by energy-storage battery discharging and recharging power due to what super capacitor was born, can reduce and frequently discharge and recharge the partial circulating charge and discharge phenomena causing, be of value to the useful life that extends whole energy-storage system, improve the economy of energy storage technology.

In 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, the best SOC of super capacitor and current SOC are compared, through proportional controller effect, then by low-pass filtering, adjusted amount initial value regulating power Δ P ' sC.Consider now whether the state of energy-storage battery is applicable to participating in regulating, and adds Rule of judgment.As Δ P ' sCfor just, super capacitor SOC, in the time of a high position, needs electric discharge adjustment, now checks the energy-storage battery extra charge volume of whether having the ability to accept; As Δ P ' sCfor negative, super capacitor SOC, in the time of low level, needs charging adjustment, now checks whether energy-storage battery has the ability to accept extra discharge capacity, if met the demands, and power adjustment value P adjust_SCbe set to Δ P ' sC; Otherwise, power adjustment value P adjust_SCbe set to 0.

2.3, secondary distribution module

By 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 batfirst pass through limit value module, ensure that its setting power is in the limit of power of energy-storage battery; Mixed energy storage system setting power P hess_refdeduct the setting power P ' of limit value energy-storage battery after treatment batobtaining super capacitor setting power is original allocation value P ' sC, through limit value manager processes, obtain final super capacitor setting power P sC;

Due to super capacitor set point P sCobtain P ' by limit value manager processes sCwith P sthe difference that C may exist, can cause that hybrid energy-storing is actual discharges and recharges power and set point there are differences, therefore 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, then carry out limit value processing, obtain final energy-storage battery setting power P bat, make the power output tracing energy-storage set point as far as possible of mixed energy storage system, reach the minimum power of stabilizing outside rear target.

Finally, 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

Apply the present invention in the mixed energy storage system with super capacitor and vanadium oxide reduction flow battery (VRB) composition.

Because the most fluctuation of wind-powered electricity generation is more than 0.01Hz, stabilizes low pass filter cutoff frequency and be taken as 0.01Hz.The wind-powered electricity generation realtime power P of wind energy turbine set wfand desired output power P after stabilizing low-pass filtering out_expas shown in accompanying drawing 6 (a) (1000 seconds time).

1, wind-powered electricity generation is stabilized control effect

The present invention and prior art adopt low-pass filtering mode to carry out wind energy turbine set real output that wind power stabilizes as shown in accompanying drawing 6 (b), can obviously find out, there are big ups and downs in the output power curve of the method for prior art employing low-pass filtering after 700 seconds.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 mixed energy storage system of two kinds of methods is less than 0.5 in the later stage, as shown in accompanying drawing 7 (a), and in the present invention, the setting power of mixed energy storage system is significantly less than the method for prior art, as shown in accompanying drawing 7 (b), the discharge power of mixed energy storage system is reduced, charge power increases, thereby improves the residue carrying capacity of mixed energy storage system.Located at 900 seconds, the average SOC of mixed energy storage system of the inventive method is 0.51 and the method for prior art is 0.3, and the two exists obvious gap, illustrates that the optimal control layer algorithm of the inventive method regulating mixed energy storage system charging and discharging capabilities to have good effect.

In order to verify the filter effect of two kinds of methods, make P wfpower curve after low-pass filtering is for expecting power, to the P of the inventive method, art methods out_expand expect that power carries out fft analysis.As shown in Figure 8, the inventive method is greater than the interval basic matching of 0.02Hz and is all tending towards 0 in frequency with expecting power, illustrates that the present invention has completed expection wind-powered electricity generation and stabilized effect; And the method for prior art obviously still has many places much larger than 0 0.02~0.12, illustrate that its wind power output power after stabilizing and the gross power of energy-storage system output still contain fluctuation composition more than more 0.02Hz.

2, hybrid energy-storing distribution effects

Analyze within 700-1000 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 known, the SOC of energy-storage battery is in rising trend in two kinds of methods, but there is remaining on for a long time for three times the situation of minimum SOC 20% in the method for prior art, force energy management that the generated output of battery is restricted to 0, as shown in accompanying drawing 9 (b), cause energy-storage system cannot complete electric discharge and stabilize task.In the time of 760 seconds to 960 seconds, energy-storage battery is in lower SOC interval, and now the setting power of the inventive method is generally less than the method for prior art, increases the chance of energy-storage battery storing energy, and its SOC increases the method apparently higher than prior art; And after 960 seconds, in the inventive method, the SOC of energy-storage battery is greater than 0.65 in the time of a high position, its setting power, again apparently higher than the method for prior art, impels SOC to draw close to the optimum SOC 0.55 arranging.This shows, the inventive method regulates very effective to the SOC of energy-storage battery.

For the state-of-charge of super capacitor, as shown in accompanying drawing 10 (a), art methods within 90.7% time SOC in below 0.6, its ability of feeding back corresponding vacancy energy is obviously in weak tendency, and repeatedly touch the end to minimum SOC 10% place, in order to prevent that phenomenon from appearring putting in super capacitor, its setting power can only be restricted to 0, as 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 maximum probability, herein the absorption excess energy of mixed energy storage system and to feed back the ability of corresponding vacancy energy the most balanced.Illustrate that classification optimisation strategy can make the SOC of super capacitor and energy-storage battery draw close to the optimum SOC arranging effectively, and the state-of-charge of mixed energy storage system is stabilized in certain scope, effectively avoid mixed energy storage system deeply to fill and put.

From simulation result, a kind of wind power based on hybrid energy-storing of the present invention is stabilized method and can kept wind power fluctuation to stabilize effect constant in the situation that, ensure that mixed energy storage system entirety charges and discharge ability, make full use of super capacitor and react fast and energy-storage battery feature capacious, maintain 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, design optimization key-course, can complete to the stabilizing of output power fluctuation of wind farm mixed energy storage system, and can maintain the charging and discharging capabilities that its entirety is higher, improves the effectively time of operation.

2. according to super capacitor in mixed energy storage system and energy-storage battery SOC state and charge-discharge characteristic separately, Design coordination key-course, the optimization that completes the setting power that optimal control layer is provided distributes, the SOC that realizes super capacitor and energy-storage battery coordinates control and the quick tracking to setting power thereof, avoided, to deeply the filling and put of energy storage device, increasing the service life simultaneously.

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 definite the spirit and scope of the present invention 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 a method, it is characterized in that, comprises the following steps:
(1), optimal control layer establishs and enforces 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 wfreject after high fdrequency component wherein through stabilizing low pass filter filtering, 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 expect SOC, calculate power adjustment value P adjust:
P adjust=(SOC avg-SOC avg_exp)×K Hess
Wherein, K hessfor proportionality coefficient, relevant with the capacity that mixed energy storage system energy storage is set, the capacity of setting is larger, and its value is less, 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 mixed energy storage system, according in mixed energy storage system storage, the capacity of energy-storage battery and super capacitor is definite, and capacity is larger, and its value is less, and vice versa; SOC batfor the current state-of-charge value (SOC) of energy-storage battery, SOC sCfor the current state-of-charge value (SOC) of super capacitor, SOC bat_exp, SOC sC_expbe respectively the best SOC value that energy-storage battery and super capacitor are set;
Power adjustment value P adjuststabilize after high fdrequency component is wherein rejected in low pass filter filtering and export through SOC;
1.3), by step 1.1) the desired output power P that obtains out_expwith step 1.2) the power adjustment value P that obtains adjustbe added, obtain wind energy turbine set output setting power P out_ref;
Wind energy turbine set is exported to setting power P out_refdeduct wind-powered electricity generation realtime power P wf, obtain mixed energy storage system setting power P hess_ref;
(2), coordinate key-course on the basis of 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_refextract low frequency part P ' wherein by distributing low-pass filtering hess_ref;
2.2), first calculate regulating power Δ P sC:
ΔP SC=(SOC SC-SOC SC_exp)×K SC
Wherein, K sCfor proportionality coefficient, larger strength of adjustment is larger, and vice versa;
Then, to regulating power Δ P sCcarry out low-pass filtering, filtering interfering, adjusted power Δ P ' sC, then according to following table, obtain power adjustment value P adjust_SC:
2.3), by 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 final super capacitor setting power P sC:
Mixed energy storage system setting power P hess_refdeduct the setting power P ' of limit value energy-storage battery after treatment batobtain super capacitor setting power P ' sC, super capacitor setting power P ' sCthrough limit value processing, obtain final super capacitor setting power P sC;
Mixed energy storage system setting power P hess_refdeduct final super capacitor setting power P sC, then carry out limit value processing, obtain final energy-storage battery setting power P bat;
Wherein, limit value processing refers to when the value of input 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 final 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 processing, that is:
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_refwhen being greater than maximum or being less than minimum value, its value is defined as maximum or minimum value by limit value manager, the mixed energy storage system setting power P of all the other limit value manager output inputs hess_ref, to avoid occurring that setting power exceeds the situation of mixed energy storage system ability, thereby extend energy-storage system useful life.
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