CN106849178B - The double-deck stabilizing system and method that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation - Google Patents
The double-deck stabilizing system and method that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation Download PDFInfo
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The present invention relates to the double-deck stabilizing systems and method that a kind of hybrid energy-storing management system HESS fluctuates wind-powered electricity generation, it is therefore an objective to which the double-deck stabilizing system and method that two-dimensional time scale wind-powered electricity generation fluctuates grid-connected requirement can be met by providing one kind.Stabilizing system includes: Wind turbines, wind-powered electricity generation measuring center, feeder line, wind field output ac bus, battery energy storage system, supercapacitor, with battery energy storage system, hybrid energy-storing management system, communication module, the data storage and management module being sequentially connected in series with hybrid energy-storing management system, with data storage and management module and the wavelet filter module connect, mean value gently stabilize module, stabilize effect assessment module；Two kinds of energy storage technologies be combined with each other by the present invention stabilizes wind-powered electricity generation fluctuation progress bilayer, and the two-dimensional time scale wind-powered electricity generation that can meet technical stipulation fluctuates grid-connected requirement.
Description
Technical field:
The invention belongs to technical field of wind power generation, and in particular to a kind of megawatt comprising supercapacitor and battery energy storage
Double-deck stabilizing system and method for the grade mixed energy storage system to wind farm grid-connected power swing.
Background technique:
With the increase of wind-powered electricity generation permeability, Wind turbines pressure regulation and fm capacity it is weak under, can not be provided to power grid instant
Active and voltage support, the scarce capacity of existing AC network carrying power flow transfer, it is difficult to effecting reaction large-scale wind power integration
Intermittent bring trend of contributing is sprung up, the fluctuation of Yi Yinfa whole network voltage.These problems make the safe and stable operation face of power grid
Face very big test, how to stabilize wind-powered electricity generation fluctuation under the premise of guaranteeing power network safety operation to increase consumption rate, become and push away
Dynamic clean energy resource development promotes industry low-carbon and urgent problem to be solved.
In wind power plant or wind power plant cluster introduce battery energy storage system be stabilize wind power fluctuation, softening its to power grid
One of major measure of impact.Two or more accumulation power supplies with different power producing characteristics are combined into mixed energy storage system
HESS, compared with the energy-storage system of single structure, it is more excellent to stabilize effect for it.The wind power plant that China carries out at present accesses power system technology
Regulation respectively limits the active fluctuation of wind field under 1 minute and 10 minutes two kinds of time scales.And domestic and international research institution
For the control strategy for stabilizing wind power plant output of mixed energy storage system, the response speed different using all kinds of energy storage is focused primarily upon
Rate and charge-discharge characteristic respectively stabilize secondary high frequency and high fdrequency component, not to fluctuation compared with slow the biggish wind power output of capacity
Climbing section takes measures, and can equally work and increase burden to the AGC frequency modulation of power grid, it is difficult to which meet under 10 minutes scales grid-connected has
Function fluctuates standard.
Goal of the invention:
It is an object of the present invention to provide one kind can meet the double-deck stabilizing system that two-dimensional time scale wind-powered electricity generation fluctuates grid-connected requirement
And method.Technical solution is as follows:
The double-deck stabilizing system that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation, comprising:
Wind turbines, wind-powered electricity generation measuring center, feeder line, wind field export ac bus, respectively simultaneously with wind field output ac bus
The battery energy storage system that connects, supercapacitor, the hybrid energy-storing management system being connected with battery energy storage system, supercapacitor
HESS, the communication module being sequentially connected in series with hybrid energy-storing management system HESS, data storage and management module, with data storage with
The management module and wavelet filter module connect, mean value gently stabilize module, stabilize effect assessment module；
The wavelet filter module stabilizes performance number and charge and discharge duration for calculate supercapacitor；Mean value
Module gently is stabilized, stabilizes performance number and charge and discharge duration for calculate battery energy storage system；Effect assessment module is stabilized, is used
In evaluation 1 minute and 10 minutes scales under fluctuation stabilize effect；
The hybrid energy-storing management system HESS and supercapacitor bidirectional data exchange, hybrid energy-storing management system HESS
Performance number, charge and discharge duration are stabilized for supercapacitor to the control parameter of supercapacitor, supercapacitor gives mixing storage
The feedback parameter of energy management system HESS is realtime power, SoC value, the charge-discharge electric power limit value, rated capacity of supercapacitor
Value；
The hybrid energy-storing management system HESS and battery energy storage system bidirectional data exchange, hybrid energy-storing management system
HESS is that battery stabilizes performance number and charge and discharge duration to the control parameter of battery energy storage system, and battery energy storage system gives mixing storage
The feedback parameter of energy management system HESS is realtime power, SoC value, the charge-discharge electric power limit value, specified appearance of battery energy storage system
Magnitude；
The hybrid energy-storing management system HESS and communication module bidirectional data exchange, hybrid energy-storing management system HESS give
The data of communication module be battery energy storage system and the respective realtime power of supercapacitor, SoC value, charge-discharge electric power limit value,
Rated capacity value, communication module to hybrid energy-storing management system HESS data be battery energy storage system, supercapacitor respectively
Stabilize performance number and charge and discharge duration；
The communication module receives the original real-time output power of wind-powered electricity generation that wind-powered electricity generation measuring center transmits simultaneously；
Two-way exchange data between the data storage and management module and wavelet filter module, data storage and pipe
Manage module to the realtime power that the data of wavelet filter module are the original real-time output power of wind-powered electricity generation and supercapacitor,
SoC value, charge-discharge electric power limit value, wavelet filter module are supercapacitor to the data of data storage and management module
Stabilize performance number, charge and discharge duration；
The data storage and management module and mean value gently stabilize two-way exchange data between module, data storage and pipe
Reason module gently stabilized module to mean value data be among wind-powered electricity generation in real time the realtime power of output power and battery energy storage system,
SoC value, charge-discharge electric power limit value, it is battery energy storage system that mean value, which gently stabilizes module to the data of data storage and management module,
Stabilize performance number, charge and discharge duration；
The data storage and management module and two-way exchange data between effect assessment module are stabilized, data storage and pipe
It is the original real-time output power of wind-powered electricity generation that reason module, which gives the data for stabilizing effect assessment module, stabilizes effect assessment module and deposits to data
The data of storage and management module are active variation maximum value slip；
The wavelet filter module, mean value gently stabilize module, it is successively unidirectional between effect assessment module block to stabilize
Data exchange, the data that wavelet filter module gently stabilizes module to mean value are that supercapacitor is stabilized among rear wind-powered electricity generation in fact
When output power, mean value gently stabilize module give stabilize effect assessment module data be battery energy storage system stabilize rear wind-powered electricity generation most
Real-time output power eventually.
The bilayer side of stabilizing that the hybrid energy-storing management system HESS realized in the above-mentioned double-deck stabilizing system fluctuates wind-powered electricity generation
Method includes the following steps:
Step A: communication module reads the data of wind-powered electricity generation measuring center and hybrid energy-storing management system HESS, then by data
It reaches data storage and management module and carries out storage and management；Wherein, the data of wind-powered electricity generation measuring center include: the wind of nearest period
The original real-time output power of electricity, supercapacitor and the respective realtime power value of battery energy storage system, charge and discharge duration, SoC value,
Charge-discharge electric power limit value, rated capacity；
Step B: wavelet filter module calculating supercapacitor stabilizes performance number, charge and discharge duration；
Step C: mean value, which gently stabilizes module and calculates battery energy storage system, stabilizes performance number, charge and discharge duration；
Step D: it stabilizes effect assessment module and calculates active variation maximum value slip；And step B and step C are calculated
Supercapacitor and battery energy storage system it is respective stabilize performance number, charge and discharge duration is converged in data storage and management module
The General Logistics Department is output to hybrid energy-storing management system HESS by communication module.
In preferably one, the step B, the calculating that supercapacitor stabilizes performance number, charge and discharge duration includes
Following steps:
Step B1: the original real-time output power of the wind-powered electricity generation of nearest period wind power plant is carried out based on Daubechies5 i.e. db5
The wavelet transformation of wavelet function decomposes；
Step B2: threshold value quantizing processing is carried out to wavelet coefficient based on threshold function table；
Step B3: reconstruction filtering signal and calculate supercapacitor stabilize performance number, charge and discharge duration.
Preferably one one of further preferred scheme, detailed process is as follows by the step B1:
Nearest choosing period of time nearest 1 hour；
Step B11: resolution ratio and wavelet basis function are determined；
It chooses db5 small echo ψ (t) and is used as wavelet basis function, taking resolution ratio is 2j, i.e. scale factor a=2j, shift factor b=
k·2j, then discrete wavelet basic function is ψ (t)=2-j/2·ψ(2-j/2·t-k)；
Step B12: the wavelet decomposition number of plies is determined；
Real-time output power P original to nearest 1 hour wind-powered electricity generationw(t) n discrete point samplings are carried out and obtain Pw(k), then it samples
Frequency isThe wave component of supercapacitor filtering is that 1 minute i.e. frequency of scale isTo highlight wave component
Place frequency band, basic frequency is taken as in exampleDecomposition order N is determined according to Nyquist's theorem:
Step B13: wavelet decomposition is carried out based on Mallat algorithm；
To Pw(k) it carries out N layers of small echo successively to decompose, the scale coefficient c of jth layerj,kThat is approximation component and wavelet coefficient dj,k
I.e. details coefficients are decomposed by -1 layer of jth (j=1,2 ..., N) of scale coefficient:
Wherein c0,k=Pw(k), j is the wavelet decomposition number of plies, l (n-2k) and h (n-2k) be respectively low-pass filter coefficients with
High-pass filter coefficient；After wavelet basis function is determined as db5 wavelet function, the coefficient of low-pass filter and high-pass filter namely
It determines；5 frequency band sections of gained are followed successively by F after filtering is decomposedi(i=1,2,3,4,5).
Preferably one further preferred scheme, detailed process is as follows by the step B2:
Step B21: unbiased evaluation of risk threshold method threshold value is used；
According to wavelet coefficient dj,kThe median of absolute value estimates noise level σ:
Step B22: according to the original real-time output power discrete sampling data length n threshold value λ of noise level σ and wind-powered electricity generation
Are as follows:
λ=σ2lg(n)
Step B23: to wavelet coefficient dj,kThe wavelet coefficient d' after threshold value quantizing is obtained after applying soft-threshold functionj,kAre as follows:
Preferably one still further preferably scheme, detailed process is as follows by the step B3:
Step B31: reconstruct number of plies N is chosen according to the approximate part of different frequency bands after decompositionc；
The wave component to be stabilized of supercapacitor is 1 minutes scale, therefore needs to select vibration frequencyPlace frequency
The affiliated number of plies with range, then reconstructed since the layer；That is:
IfThen Nc=i, therefore from NcLayer starts successively up to reconstruct；
Step B32: approximate part is successively reconstructed based on gained wavelet coefficient in step B1 and step B2:
Wherein j=Nc, Nc-1 ..., 1, the wind power signal after finally obtaining wavelet filter are as follows:
Then the initial of supercapacitor stabilizes performance number are as follows: Pc(t)=P'w(t)-Pw(t), then t0Moment initially stabilizes function
Rate value is Pc(t0)；
Step B33: according to the SoC of supercapacitorcIt is worth and determines t0Moment stabilizes performance number P'c(t0) and charge and discharge duration Tc
(t0):
Supercapacitor operating dead zone width Delta Pc_d=0.1MW stabilizes performance number variation when two of interval delta T and is less than
When skip distance, remains previous on the basis of considering current SoC and stabilize performance number；
There are two types of situations for emergency:
Emergency situations B1: work as SoCc_real<SoCc_L, supercapacitor is in over-discharge state, and need to charge makes SoCcIt returns just
Normal workspace, then t0The performance number of stabilizing of moment supercapacitor is
P'c(t0)=max {-Pw(t0),-Pc_cmax}；
Emergency situations B2: work as SoCc_real>SoCc_H, supercapacitor is in overcharging state, and need to discharge makes SoCcIt returns just
Normal workspace, then t0The performance number of stabilizing of moment supercapacitor is
P'c(t0)=min { Pw(t0),Pc_dmax}；
Above two emergency situations continue charging duration
Normal condition, i.e. SoCc_L<SoCc_real<SoCc_HWhen, there are four types of situations:
Normal conditions B1: when | Pc_real(t0-ΔT)-Pc(t0)|>ΔPc_d, and Pc(t0When) > 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B2: when | Pc_real(t0-ΔT)-Pc(t0)|>ΔPc_d, and Pc(t0When) < 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B3: when | Pc_real(t0-ΔT)-Pc(t0)|<ΔPc_d, and Pc(t0When) > 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B4: when | Pc_real(t0-ΔT)-Pc(t0)|<ΔPc_d, and Pc(t0When) < 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Above-mentioned four kinds of normal conditions charge and discharge duration is Tc(t0)=Δ T.
In preferably two, the step C, the calculation method for stabilizing performance number of battery energy storage system is as follows:
Nearest choosing period of time nearest 1 hour；
Step C1: determine that central value is stabilized in secondary fluctuation；
Output power is in real time among wind-powered electricity generation after supercapacitor is once stabilized
Po1(t)=Pw(t)-P'c(t)；
It carries out gentle secondary of mean value for the low frequency component to biggish 10 minutes scales of amplitude to stabilize, after once stabilizing
Wind-powered electricity generation among mean value P of the output power in nearest 10 minutes in real timeavgAs target interval central value:
Wherein p is real-time output power data amount check among the wind-powered electricity generation in 10 minutes；
Step C2: determine that target interval is stabilized in secondary fluctuation and battery energy storage system initially stabilizes performance number:
By PavgNeighborhood (1 ± 10%) PavgIt is set as wind-powered electricity generation finally real-time output power signal Po2Allowed band, it is determined that
The gentle battery energy storage of mean value initially stabilizes performance number Pb(t0) method are as follows:
If Po1(t0)-Pavg> 10%Pavg, and Pavg> 0, Pb(t0)=- (Po1(t0)-Pavg) -10%Pavg)；
If Po1(t0)-Pavg> -10%Pavg, and Pavg< 0, Pb(t0)=- ((Po1(t0)-Pavg)+10%Pavg)；
If Po1(t0)-Pavg< -10%Pavg, and Pavg> 0,
Pb(t0)=- ((Po1(t0)-Pavg)+10%Pavg)；
If Po1(t0)-Pavg< 10%Pavg, and Pavg< 0, Pb(t0)=- (Po1(t0)-Pavg) -10%Pavg)；
If -10% < (Po1(t0)-Pavg)/Pavg< 10%, Pb(t0)=0；
Step C3: according to the SoC of battery energy storage systembIt is worth and determines t0Moment stabilizes performance number P'b(t0) and charge and discharge duration
Tb(t0):
Battery energy storage operating dead zone width Delta Pb_d=0.1MW, two when interval delta T are stabilized performance number variation less than dead
When sector width, remains previous on the basis of considering current SoC and stabilize performance number；
There are two types of situations for emergency:
Emergency situations C1: work as SoCb_real<SoCb_L, battery energy storage system is in over-discharge state, and need to charge makes SoCbIt returns
Work normally area；Then t0The performance number of stabilizing of moment battery energy storage system is
P'b(t0)=max {-Po1(t0),-Pb_cmax}；
Emergency situations C2: work as SoCb_real>SoCb_H, battery energy storage system is in overcharging state, and need to discharge makes SoCbIt returns
Work normally area；Then t0The performance number of stabilizing of moment battery energy storage system is
P'b(t0)=min { Po1(t0),Pb_dmax}；
Above two emergency situations continue charging duration
Normal condition, that is, SoCb_L<SoCb_real<SoCb_HWhen, there are four types of situations:
Normal conditions C1: when | Pb_real(t0-ΔT)-Pb(t0)|>ΔPb_d, and Pb(t0When) > 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C2: when | Pb_real(t0-ΔT)-Pb(t0)|>ΔPb_d, and Pb(t0When) < 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C3: when | Pb_real(t0-ΔT)-Pb(t0)|<ΔPb_d, and Pb(t0When) > 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C4: when | Pb_real(t0-ΔT)-Pb(t0)|<ΔPb_d, and Pb(t0When) < 0, then t0Moment battery energy storage
Performance number of stabilizing be
Above-mentioned four kinds of normal conditions charge and discharge duration is Tb(t0)=Δ T.
In preferably three, the step D,
After the mean value of the wavelet filter of supercapacitor and battery energy storage system is gentle, wind-powered electricity generation is final defeated in real time
Power is P outo2(t)=Pw(t)-P'b(t)-P'c(t)；It stabilizes effect assessment module and calculates active variation maximum value slip
Process includes:
Step D1: calculating description wind power plant in minute scale power and stabilize the index of effect, 1 minute maximum active power
Variable quantity slip, to reflect the reduction degree of 1 minutes scale maximum power variation amount:
For in power change values under nearest 1 hour wind-powered electricity generation finally 1 minute scale of real-time output power
Maximum value,It indicates under the original 1 minute scale of real-time output power of nearest 1 hour wind-powered electricity generation in power change values
Maximum value；
Step D2: description wind power plant is calculated in 10 minutes scale power and stabilizes the index of effect, i.e., 10 minutes maximum active
Power variation slip, to reflect the reduction degree of 10 minutes scale maximum power variation amounts:
For in power change values under nearest 1 hour wind-powered electricity generation finally 10 minutes scales of real-time output power
Maximum value,Indicate power change values under the original 10 minutes scales of real-time output power of nearest 1 hour wind-powered electricity generation
In maximum value.
The present invention has following features and progress compared with the existing technology:
Wavelet filter can carry out high-pass filtering and low-pass filtering simultaneously, and real-time wind power output multilayer is decomposed, and distinguish
Different frequencies component of degree n n simultaneously pointedly absorbs high frequency and time high-frequency fluctuation；The gentle method of mean value then can be to relatively slow low frequency bulk
Climbing section carries out cut-off and stabilizes；Supercapacitor has good cycle life number, meets the higher power of the charge and discharge frequency
Type application scenarios can absorb high-frequency fluctuation；Battery energy storage capacity is larger, can stabilize relatively slow climbing section.The present invention will store up two kinds
Energy technology, which be combined with each other, stabilizes wind-powered electricity generation fluctuation progress bilayer, and the two-dimensional time scale wind-powered electricity generation fluctuation that can meet technical stipulation is grid-connected
It is required that.
The present invention comprehensively considered supercapacitor and battery energy storage system charge-discharge electric power capacity limit and real-time lotus
Electricity condition formulates the real-time charge and discharge strategy of the suitable amount of stabilizing allocation strategy and two class energy storage, and having reached wind farm grid-connected has
Function changed power standard.
Detailed description of the invention:
Fig. 1 is present system theory of constitution schematic diagram；Each real-time output power of blower is by each feeder line and confluence in wind field
Wind-powered electricity generation measuring center is transferred to after bus nodes measurement, and wind-powered electricity generation measuring center is by the original real-time output power number of the wind-powered electricity generation after summarizing
According to the system that designs of the input present invention, performance number and charge and discharge are stabilized by what the system exported supercapacitor and battery energy storage system
Electric duration is handed down to hybrid energy-storing management system HESS, controls supercapacitor and battery storage system can contribute and boosted change
Depressor imports wind power plant and exports ac bus.
Fig. 2 is that embodiment hybrid energy-storing management system HESS illustrates the double-deck stabilizing system data exchange that wind-powered electricity generation fluctuates
Figure；In figure, communication module is stored up for receiving wind-powered electricity generation measuring center and hybrid energy-storing management system HESS related data to mixing
Can management system HESS send supercapacitor and battery energy storage system stabilize performance number and charge and discharge duration；Data storage with
Management module, is used for storage and management corresponding data, and stabilizing supercapacitor and battery energy storage system performance number and fill
Electric discharge duration is handed down to the corresponding command receiving port of hybrid energy-storing management system HESS；Wavelet filter module, based on
That calculates supercapacitor stabilizes performance number and charge and discharge duration；Mean value gently stabilizes module, for calculating battery energy storage system
Stabilize performance number and charge and discharge duration；Stabilize effect assessment module, for evaluate 1 minute and 10 minutes scales under fluctuation
Stabilize effect.
Specific embodiment:
Embodiment:
The present embodiment is referring to GBT_19963-2011 " wind power plant accesses power system technology regulation " to wind when operating normally
The regulation of active power variation threshold limit value, specific data are as shown in table 1 under 1 minute scale of electric field and 10 minutes scales:
Active power of wind power field changes threshold limit value under 1 normal operation of table
Technical solution is as follows:
Symbol description:
HESS (Hybrid Energy Storage System): mixed energy storage system
SoC (State of Charge): state-of-charge
Pb_real/Pc_real: the practical practical power generating value of power generating value/supercapacitor of battery energy storage system；
Pb_dmax/Pc_dmax: discharge power limit value/supercapacitor discharge power limit value of battery energy storage system；
Pb_cmax/Pc_cmax: charge power limit value/supercapacitor charge power limit value of battery energy storage system；
SoCb_H/SoCc_H: the upper limit value of battery energy storage system state-of-charge/supercapacitor state-of-charge upper limit value；
SoCb_L/SoCc_L: the lower limit value of battery energy storage system state-of-charge/supercapacitor state-of-charge lower limit value；
SoCb_m: the median of battery energy storage system state-of-charge,
SoCb_m=(SoCb_L+SoCb_H)/2
SoCc_m: the median of supercapacitor state-of-charge, SoCc_m=(SoCc_L+SoCc_H)/2；
Qbe/Qce: specified electric quantity value/supercapacitor specified electric quantity value of battery energy storage system；
ψ (t): wavelet basis function；
A: the wavelet transform dimension factor；
B: wavelet transformation shift factor；
Pw(t): the real-time wind power of wind power plant；
Pw(k): the real-time wind power sequence of wind power plant after sampling；
N: the number of sampling points of real-time output power original to wind-powered electricity generation, i.e. sampled data length；
fs/f0: sample frequency/basic frequency；
N: wavelet transformation Decomposition order；
cj,k/dj,k: the scale coefficient of jth layer small echo/jth layer small echo wavelet coefficient；
c0,k: the initial signal of wavelet decomposition；
L (n-2k)/h (n-2k): low-pass filter coefficients/high-pass filter coefficient；
σ: noise level；
λ: the threshold value of wavelet coefficient；
d'j,k: the wavelet coefficient of the jth layer small echo after threshold value quantizing；
Nc: the number of plies that wavelet reconstruction starts；
Fi: decompose frequency band section where i-th layer of small echo of gained；
P'w(t): the wind power signal obtained after wavelet reconstruction；
Pc(t)/Pb(t): power/battery energy storage system of initially stabilizing of supercapacitor initially stabilizes power；
P'c(t0)/P'b(t0): supercapacitor t0Moment decision stabilizes performance number/battery energy storage system t0Moment decision
Stabilize performance number；
Tc(t0)/Tb(t0): supercapacitor t0Charge and discharge duration/battery energy storage system the t at moment0When the charge and discharge at moment
It is long；
ΔPc_d/ΔPb_d: operating dead zone value/battery energy storage system operating dead zone value of supercapacitor；
Δ T: the two neighboring time interval stabilized between power instruction；
Po1(t): supercapacitor stabilize after wind-powered electricity generation among real-time output power；
Po2(t): battery energy storage system stabilize after the final real-time output power of wind-powered electricity generation；
Pavg: Po1(t) in t=t0Mean value before moment in nearest 10 minutes；
The original real-time output power data sampling number of wind-powered electricity generation in p:10 minutes；
ξ1/ξ10: slip/10 minutes of the wind-powered electricity generation active power of output variation maximum value under 1 minutes scale
The slip of wind-powered electricity generation active power of output variation maximum value under scale；
T=t0The final 1 minute ruler of real-time output power of moment nearest 1 hour wind-powered electricity generation
Spend the finally changed power under 10 minutes scales of real-time output power of maximum value/nearest 1 hour wind-powered electricity generation in lower power change values
Maximum value in value；
T=t0The original 1 minute ruler of real-time output power of moment nearest 1 hour wind-powered electricity generation
Spend changed power under the original 10 minutes scales of real-time output power of maximum value/nearest 1 hour wind-powered electricity generation in lower power change values
Maximum value in value.
The double-deck stabilizing system that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation, comprising:
Wind turbines, wind-powered electricity generation measuring center, feeder line, wind field export ac bus, respectively simultaneously with wind field output ac bus
The battery energy storage system that connects, supercapacitor, the hybrid energy-storing management system being connected with battery energy storage system, supercapacitor
HESS, the communication module being sequentially connected in series with hybrid energy-storing management system HESS, data storage and management module, with data storage with
The management module and wavelet filter module connect, mean value gently stabilize module, stabilize effect assessment module；
The hybrid energy-storing management system HESS and supercapacitor bidirectional data exchange, hybrid energy-storing management system HESS
Performance number, charge and discharge duration are stabilized for supercapacitor to the control parameter of supercapacitor, supercapacitor gives mixing storage
Can management system HESS feedback parameter be the real-time output power of supercapacitor, it is SoC value, charge-discharge electric power limit value, specified
Capability value；
The hybrid energy-storing management system HESS and battery energy storage system bidirectional data exchange, hybrid energy-storing management system
HESS is that battery stabilizes performance number and charge and discharge duration to the control parameter of battery energy storage system, and battery energy storage system gives mixing storage
The feedback parameter of energy management system HESS is real-time output power, SoC value, the charge-discharge electric power limit value, volume of battery energy storage system
Nominal value；
The hybrid energy-storing management system HESS and communication module bidirectional data exchange, hybrid energy-storing management system HESS give
The data of communication module are battery energy storage system and the respective real-time output power of supercapacitor, SoC value, charge-discharge electric power limit
Value, rated capacity value, communication module are that battery energy storage system, supercapacitor are each to the data of hybrid energy-storing management system HESS
From stabilize performance number and charge and discharge duration；
The communication module receives the original real-time output power of wind-powered electricity generation that wind-powered electricity generation measuring center transmits simultaneously；
Two-way exchange data between the data storage and management module and wavelet filter module, data storage and pipe
Manage module to the realtime power that the data of wavelet filter module are the original real-time output power of wind-powered electricity generation and supercapacitor,
SoC value, charge-discharge electric power limit value, wavelet filter module are supercapacitor to the data of data storage and management module
Stabilize performance number, charge and discharge duration；
The data storage and management module and mean value gently stabilize two-way exchange data between module, data storage and pipe
Reason module gently stabilized module to mean value data be among wind-powered electricity generation in real time the realtime power of output power and battery energy storage system,
SoC value, charge-discharge electric power limit value, it is battery energy storage system that mean value, which gently stabilizes module to the data of data storage and management module,
Stabilize performance number, charge and discharge duration；
The data storage and management module and two-way exchange data between effect assessment module are stabilized, data storage and pipe
It is the original real-time output power of wind-powered electricity generation that reason module, which gives the data for stabilizing effect assessment module, stabilizes effect assessment module and deposits to data
The data of storage and management module are active variation maximum value slip；
The wavelet filter module, mean value gently stabilize module, it is successively unidirectional between effect assessment module block to stabilize
Data exchange, the data that wavelet filter module gently stabilizes module to mean value are that supercapacitor is stabilized among rear wind-powered electricity generation in fact
When output power, mean value gently stabilize module give stabilize effect assessment module data be battery energy storage system stabilize rear wind-powered electricity generation most
Real-time output power eventually.
The bilayer side of stabilizing that the hybrid energy-storing management system HESS realized in the above-mentioned double-deck stabilizing system fluctuates wind-powered electricity generation
Method includes the following steps:
Step A: communication module reads the data of wind-powered electricity generation measuring center and hybrid energy-storing management system HESS, then by data
It reaches data storage and management module and carries out storage and management；Wherein, the data of wind-powered electricity generation measuring center include: nearest 1 hour
The original real-time output power of wind-powered electricity generation, supercapacitor and the respective realtime power value of battery energy storage system, charge and discharge duration, SoC
Value, charge-discharge electric power limit value, rated capacity；
Step B: wavelet filter module calculating supercapacitor stabilizes performance number, charge and discharge duration；Detailed process
It is as follows:
Step B1: the original real-time output power of the wind-powered electricity generation of nearest period wind power plant is carried out based on Daubechies5 i.e. db5
The wavelet transformation of wavelet function decomposes；Detailed process is as follows by step B1:
Step B11: resolution ratio and wavelet basis function are determined；
It chooses db5 small echo ψ (t) and is used as wavelet basis function, taking resolution ratio is 2j, i.e. scale factor a=2j, shift factor b=
k·2j, then discrete wavelet basic function is ψ (t)=2-j/2·ψ(2-j/2·t-k)；
Step B12: the wavelet decomposition number of plies is determined；
Real-time output power P original to nearest 1 hour wind-powered electricity generationw(t) n discrete point samplings are carried out and obtain Pw(k), then it samples
Frequency isThe wave component of supercapacitor filtering is that 1 minute i.e. frequency of scale isTo highlight wave component institute
Basic frequency is taken as in frequency band, exampleDecomposition order N is determined according to Nyquist's theorem:
Step B13: wavelet decomposition is carried out based on Mallat algorithm；
To Pw(k) it carries out N layers of small echo successively to decompose, the scale coefficient c of jth layerj,kThat is approximation component and wavelet coefficient dj,k
I.e. details coefficients are decomposed by -1 layer of jth (j=1,2 ..., N) of scale coefficient:
Wherein c0,k=Pw(k), j is the wavelet decomposition number of plies, l (n-2k) and h (n-2k) be respectively low-pass filter coefficients with
High-pass filter coefficient；After wavelet basis function is determined as db5 wavelet function, the coefficient of low-pass filter and high-pass filter namely
It determines；5 frequency band sections of gained are followed successively by F after filtering is decomposedi(i=1,2,3,4,5).
Step B2: threshold value quantizing processing is carried out to wavelet coefficient based on threshold function table；Detailed process is as follows by step B2:
Step B21: unbiased evaluation of risk threshold method threshold value is used；
According to wavelet coefficient dj,kThe median of absolute value estimates noise level σ:
Step B22: according to the original real-time output power discrete sampling data length n threshold value λ of noise level σ and wind-powered electricity generation
Are as follows:
λ=σ2lg(n)
Step B23: to wavelet coefficient dj,kThe wavelet coefficient d' after threshold value quantizing is obtained after applying soft-threshold functionj,kAre as follows:
Step B3: reconstruction filtering signal and calculate supercapacitor stabilize performance number, charge and discharge duration；The tool of step B3
Body process is as follows:
Step B31: reconstruct number of plies N is chosen according to the approximate part of different frequency bands after decompositionc；
The wave component to be stabilized of supercapacitor is 1 minutes scale, therefore needs to select vibration frequencyPlace frequency
The affiliated number of plies with range, then reconstructed since the layer；That is:
IfThen Nc=i, therefore from NcLayer starts successively up to reconstruct；
Step B32: approximate part is successively reconstructed based on gained wavelet coefficient in step B1 and step B2:
Wherein j=Nc, Nc-1 ..., 1, the wind power signal after finally obtaining wavelet filter are as follows:
Then the initial of supercapacitor stabilizes performance number are as follows: Pc(t)=P'w(t)-Pw(t), then t0Moment initially stabilizes function
Rate value is Pc(t0)；
Step B33: according to the SoC of supercapacitorcIt is worth and determines t0Moment stabilizes performance number P'c(t0) and charge and discharge duration Tc
(t0):
Supercapacitor operating dead zone width Delta Pc_d=0.1MW stabilizes performance number variation when two of interval delta T and is less than
When skip distance, remains previous on the basis of considering current SoC and stabilize performance number；
There are two types of situations for emergency:
Emergency situations B1: work as SoCc_real<SoCc_L, supercapacitor is in over-discharge state, and need to charge makes SoCcIt returns just
Normal workspace, then t0The performance number of stabilizing of moment supercapacitor is
P'c(t0)=max {-Pw(t0),-Pc_cmax}；
Emergency situations B2: work as SoCc_real>SoCc_H, supercapacitor is in overcharging state, and need to discharge makes SoCcIt returns just
Normal workspace, then t0The performance number of stabilizing of moment supercapacitor is
P'c(t0)=min { Pw(t0),Pc_dmax}；
Above two emergency situations continue charging duration
Normal condition, i.e. SoCc_L<SoCc_real<SoCc_HWhen, there are four types of situations:
Normal conditions B1: when | Pc_real(t0-ΔT)-Pc(t0)|>ΔPc_d, and Pc(t0When) > 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B2: when | Pc_real(t0-ΔT)-Pc(t0)|>ΔPc_d, and Pc(t0When) < 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B3: when | Pc_real(t0-ΔT)-Pc(t0)|<ΔPc_d, and Pc(t0When) > 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Normal conditions B4: when | Pc_real(t0-ΔT)-Pc(t0)|<ΔPc_d, and Pc(t0When) < 0, then t0Moment super capacitor
The performance number of stabilizing of device is
Above-mentioned four kinds of normal conditions charge and discharge duration is Tc(t0)=Δ T.
Step C: mean value, which gently stabilizes module and calculates battery energy storage system, stabilizes performance number, charge and discharge duration；Step C
In, the calculation method for stabilizing performance number of battery energy storage system is as follows:
Step C1: determine that central value is stabilized in secondary fluctuation；
Output power value is in real time among real-time wind-powered electricity generation after supercapacitor is once stabilized
Po1(t)=Pw(t)-P'c(t)；
It carries out gentle secondary of mean value for the low frequency component to biggish 10 minutes scales of amplitude to stabilize, after once stabilizing
Real-time wind-powered electricity generation among mean value P of the output power in nearest 10 minutes in real timeavgAs target interval central value:
Wherein p is real-time output power data amount check among the wind-powered electricity generation in 10 minutes；
Step C2: determine that target interval is stabilized in secondary fluctuation and battery energy storage system initially stabilizes performance number:
The active variation threshold limit value for considering the 10 minutes scale of wind power plant of technical standard order, by PavgNeighborhood (1
± 10%) PavgIt is set as wind field finally real-time output power signal Po2Allowed band, it is determined that at the beginning of the gentle battery energy storage of mean value
Beginning stabilizes performance number Pb(t0) method are as follows:
If Po1(t0)-Pavg> 10%Pavg, and Pavg> 0, Pb(t0)=- (Po1(t0)-Pavg) -10%Pavg)；
If Po1(t0)-Pavg> -10%Pavg, and Pavg< 0, Pb(t0)=- ((Po1(t0)-Pavg)+10%Pavg)；
If Po1(t0)-Pavg< -10%Pavg, and Pavg> 0,
Pb(t0)=- ((Po1(t0)-Pavg)+10%Pavg)；
If Po1(t0)-Pavg< 10%Pavg, and Pavg< 0, Pb(t0)=- (Po1(t0)-Pavg) -10%Pavg)；
If -10% < (Po1(t0)-Pavg)/Pavg< 10%, Pb(t0)=0；
Step C3: according to the SoC of battery energy storage systembIt is worth and determines t0Moment stabilizes performance number P'b(t0) and charge and discharge duration
Tb(t0):
Battery energy storage operating dead zone width Delta Pb_d=0.1MW, two when interval delta T are stabilized performance number variation less than dead
When sector width, remains previous on the basis of considering current SoC and stabilize performance number；
There are two types of situations for emergency:
Emergency situations C1: work as SoCb_real<SoCb_L, battery energy storage system is in over-discharge state, and need to charge makes SoCbIt returns
Work normally area；Then t0The performance number of stabilizing of moment battery energy storage system is
P'b(t0)=max {-Po1(t0),-Pb_cmax}；
Emergency situations C2: work as SoCb_real>SoCb_H, battery energy storage system is in overcharging state, and need to discharge makes SoCbIt returns
Work normally area；Then t0The performance number of stabilizing of moment battery energy storage system is
P'b(t0)=min { Po1(t0),Pb_dmax}；
Above two emergency situations continue charging duration
Normal condition, that is, SoCb_L<SoCb_real<SoCb_HWhen, there are four types of situations:
Normal conditions C1: when | Pb_real(t0-ΔT)-Pb(t0)|>ΔPb_d, and Pb(t0When) > 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C2: when | Pb_real(t0-ΔT)-Pb(t0)|>ΔPb_d, and Pb(t0When) < 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C3: when | Pb_real(t0-ΔT)-Pb(t0)|<ΔPb_d, and Pb(t0When) > 0, then t0Moment battery energy storage
Performance number of stabilizing be
Normal conditions C4: when | Pb_real(t0-ΔT)-Pb(t0)|<ΔPb_d, and Pb(t0When) < 0, then t0Moment battery energy storage
Performance number of stabilizing be
Above-mentioned four kinds of normal conditions charge and discharge duration is Tb(t0)=Δ T.
Step D: after the mean value of the wavelet filter of supercapacitor and battery energy storage system is gentle, wind-powered electricity generation is final
Real-time output power is Po2(t)=Pw(t)-P'b(t)-P'c(t)；The active variation maximum value of effect assessment module calculating is stabilized to subtract
The process of rate includes: less
Step D1: calculating description wind power plant in minute scale power and stabilize the index of effect, 1 minute maximum active power
Variable quantity slip, to reflect the reduction degree of 1 minutes scale maximum power variation amount:
For in power change values under nearest 1 hour wind-powered electricity generation finally 1 minute scale of real-time output power
Maximum value,It indicates under the original 1 minute scale of real-time output power of nearest 1 hour wind-powered electricity generation in power change values
Maximum value；
Step D2: description wind power plant is calculated in 10 minutes scale power and stabilizes the index of effect, i.e., 10 minutes maximum active
Power variation slip, to reflect the reduction degree of 10 minutes scale maximum power variation amounts:
For in power change values under nearest 1 hour wind-powered electricity generation finally 10 minutes scales of real-time output power
Maximum value,It indicates under the original 10 minutes scales of real-time output power of nearest 1 hour wind-powered electricity generation in power change values
Maximum value.
In the present embodiment, double-deck stabilizing system wind-powered electricity generation fluctuated based on wavelet filter and mean value gentle HESS
And method practical wind power plant operation with control work in be easy to grasp, this method with reduce 1 minute and 10 minutes scales under
Active variation maximum value is control target, turns back charge and discharge rapidly and the larger feature of battery energy storage capacity using supercapacitor,
Gently distributed in real time between supercapacitor and battery energy storage respectively based on wavelet filter and mean value the different frequencys and compared with
The slow climbing section amount of stabilizing, can satisfy wind farm grid-connected active fluctuation stabilizes demand in real time.
Combining super capacitor device reflects the charge-discharge electric power limit value of its power characteristic and reflects the real-time lotus of its energy response
The charge and discharge of turning back of electricity condition SoC and supercapacitor is rapidly contributed feature, real-time out based on wavelet filter decomposition module
The undulate quantity of wind power higher-frequency time stabilizes power in real time as supercapacitor, to fill considering supercapacitor
Wind power is absorbed on the basis of discharge capacity nargin in the fluctuation of 1 minutes scale, keeps the active fluctuation of wind power plant output full
Its access electric system of foot is to the fluctuating level requirement under 1 minutes scale.
Power is stabilized in real time using the supercapacitor that wavelet filter module exports, and reflects its function in conjunction with battery energy storage
The real-time state-of-charge SoC and battery energy storage capacity of its energy response of the charge-discharge electric power limit value and reflection of rate characteristic are biggish
Feature is gently stabilized module based on mean value and calculates real-time wind power in the climbing section undulate quantity conduct of 10 minutes scales
Battery energy storage stabilizes power in real time, to absorb wind power on the basis of considering battery energy storage discharge and recharge nargin
In the fluctuation of 10 minutes scales, so that the active fluctuation of wind power plant output is met it and access electric system to 10 minutes scales
Under fluctuating level requirement.
Claims (3)
1. the double-deck stabilizing system that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation, comprising: in Wind turbines, wind-powered electricity generation measurement
The heart, feeder line, wind field export ac bus；It is characterized by further comprising:
Respectively with wind field export ac bus and connect battery energy storage system, supercapacitor, with battery energy storage system, super electricity
The connected hybrid energy-storing management system HESS of container, communication module, the data being sequentially connected in series with hybrid energy-storing management system HESS
Storage and management module, with data storage and management module and the wavelet filter module connect, mean value are gently stabilized module, are put down
Press down effect assessment module；
The wavelet filter module stabilizes performance number and charge and discharge duration for calculate supercapacitor；Mean value is gentle
Module is stabilized, stabilizes performance number and charge and discharge duration for calculate battery energy storage system；Effect assessment module is stabilized, for commenting
Effect is stabilized in valence fluctuation；
The hybrid energy-storing management system HESS and supercapacitor bidirectional data exchange, hybrid energy-storing management system HESS is to super
The control parameter of grade capacitor stabilizes performance number, charge and discharge duration for supercapacitor, and supercapacitor gives hybrid energy-storing pipe
The feedback parameter of reason system HESS is realtime power, SoC value, the charge-discharge electric power limit value, rated capacity value of supercapacitor；
The hybrid energy-storing management system HESS and battery energy storage system bidirectional data exchange, hybrid energy-storing management system HESS give
The control parameter of battery energy storage system is that battery stabilizes performance number, charge and discharge duration, and battery energy storage system gives hybrid energy-storing management
The feedback parameter of system HESS is realtime power, SoC value, the charge-discharge electric power limit value, rated capacity value of battery energy storage system；
The hybrid energy-storing management system HESS and communication module bidirectional data exchange, hybrid energy-storing management system HESS is to communication
The data of module are battery energy storage system and the respective realtime power of supercapacitor, SoC value, charge-discharge electric power limit value, specified
Capability value, communication module are that battery energy storage system, supercapacitor are respective flat to the data of hybrid energy-storing management system HESS
Press down performance number and charge and discharge duration；
The communication module receives the original real-time output power of wind-powered electricity generation that wind-powered electricity generation measuring center transmits simultaneously；
Two-way exchange data between the data storage and management module and wavelet filter module, data storage and management mould
Block to the realtime power that the data of wavelet filter module are the original real-time output power of wind-powered electricity generation and supercapacitor, SoC value,
Charge-discharge electric power limit value, wavelet filter module stabilize function to the data of data storage and management module for supercapacitor
Rate value, charge and discharge duration；
The data storage and management module and mean value gently stabilize two-way exchange data between module, data storage and management mould
The data that block gently stabilizes module to mean value are realtime power, the SoC of real-time output power and battery energy storage system among wind-powered electricity generation
Value, charge-discharge electric power limit value, it is battery energy storage system that mean value, which gently stabilizes module to the data of data storage and management module,
Stabilize performance number, charge and discharge duration；
The data storage and management module and stabilize two-way exchange data between effect assessment module, data storage and management mould
Block give stabilize effect assessment module data be the original real-time output power of wind-powered electricity generation, stabilize effect assessment module to data storage with
The data of management module are active variation maximum value slip；
The wavelet filter module, mean value gently stabilize module, stabilizes between effect assessment module block successively one-way data
Exchange, it is defeated in real time among rear wind-powered electricity generation that the data that wavelet filter module gently stabilizes module to mean value are that supercapacitor is stabilized
Power out, it is that battery energy storage system stabilizes rear wind-powered electricity generation finally in fact that mean value, which gently stabilizes module to the data for stabilizing effect assessment module,
When output power.
2. the bilayer that the hybrid energy-storing management system HESS realized in the bilayer stabilizing system described in claim 1 fluctuates wind-powered electricity generation
Stabilize method, which comprises the steps of:
Step A: communication module reads the data of wind-powered electricity generation measuring center and hybrid energy-storing management system HESS, then reaches data
Data storage and management module carries out storage and management；Wherein, the data of wind-powered electricity generation measuring center include: that the wind-powered electricity generation of nearest period is former
Begin real-time output power, supercapacitor and the respective realtime power value of battery energy storage system, charge and discharge duration, SoC value, charge and discharge
Electrical power limit value, rated capacity；
Step B: wavelet filter module calculating supercapacitor stabilizes performance number, charge and discharge duration；
Step C: mean value, which gently stabilizes module and calculates battery energy storage system, stabilizes performance number, charge and discharge duration；
Step D: it stabilizes effect assessment module and calculates active variation maximum value slip；And it is step B and step C is calculated super
Grade capacitor and battery energy storage system it is respective stabilize performance number, charge and discharge duration summarizes in data storage and management module
Afterwards, hybrid energy-storing management system HESS is output to by communication module.
3. the bilayer that hybrid energy-storing management system HESS fluctuates wind-powered electricity generation according to claim 2 stabilizes method, feature exists
In in the step B, the calculating that supercapacitor stabilizes performance number, charge and discharge duration includes the following steps:
Step B1: the original real-time output power of the wind-powered electricity generation of nearest period wind power plant is carried out based on Daubechies5 i.e. db5 small echo
The wavelet transformation of function decomposes；
Step B2: threshold value quantizing processing is carried out to wavelet coefficient based on threshold function table；
Step B3: reconstruction filtering signal and calculate supercapacitor stabilize performance number, charge and discharge duration.
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