CN106096285B - A kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method - Google Patents
A kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method Download PDFInfo
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Abstract
The present invention is that a kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method, its main feature is that, this method copes with the evaluation index of high wind-powered electricity generation permeability electric system frequency modulation demand by the energy-storage system of foundation, and choosing energy-storage system using analytic hierarchy process (AHP) participates in frequency modulation Proportional coefficient KP, consider the advantage factors such as energy-storage system side, power grid side, research establishes different type energy-accumulating power station and participates in electric system frequency modulation ancillary service pricing mechanism, and the wind-powered electricity generation for improving existing power grid receives ability and system operation safety.With methodological science, the advantages that strong applicability, effect is good.
Description
Technical field
The present invention relates to technical field of wind power generation, are that a kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand
Effect assessment method.
Background technology
World today's energy consumption increasingly increases, and problem of environmental pollution is more prominent, and restrict world economy can with society
Sustainable development.Wind energy compares traditional fossil fuel, has as current most potential non-aqueous energy regenerative resource
Safe and reliable, free of contamination superperformance, and gradually develop into a kind of emerging leading energy.2015, China was with 148GW
Accumulative installed capacity continue to hold a post or title the first in the world, the newly-increased wind capacity integrated into grid 32.97GW in the whole nation adds up grid connection capacity 146.26GW.
According to China《Country's reply climate change planning (2014-2020)》The object of planning, it is contemplated that the year two thousand twenty installed capacity of wind-driven power
It is up to 200GW.For the electric system frequency modulation problem brought of large-scale wind power access, traditional frequency modulation unit due to ratio by
Step declines and the limitation and deficiency of frequency modulation performance, it is difficult to cope with Future Power System frequency modulation needs.
Fired power generating unit exists intrinsic insufficient in terms of frequency modulation：Low-response, it is impossible to accurately track Automatic Generation Control
(automatic generation control, AGC) is instructed, and can even cause the negative direction tune to area control error sometimes
Section.The ratio accessed with generation of electricity by new energy gradually increases, and in view of characteristics such as its intermittence, fluctuations, and power grid frequency modulation is held
The problem of amount is insufficient gradually highlights.Battery energy storage system (battery energy storage system, BESS) is due to frequency modulation
Effect is good, the whole fm capacity of electric system of a small amount of energy storage by effective promotion based on thermoelectricity.However, due to energy storage system
Cost of investment of uniting is high, greatly limits the configuration capacity of energy-storage system, rational stored energy capacitance configuration will for meeting power grid frequency modulation
Ask most important.Have therefore it provides a kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method
Very big significance.
Invention content
The technical problems to be solved by the invention are, from high wind-powered electricity generation permeability system frequency modulation problem, it is proposed that reply
The energy-storage system assessment of economic benefit method of electric system frequency modulation demand.This method has considered energy-storage system side, power grid side
Etc. interests, establish different type energy-accumulating power station participate in electric system frequency modulation ancillary service pricing mechanism, promote energy storage improve electricity
Application in net fm capacity.
Solving the scheme of its technology is, a kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment side
Method, it is characterized in that, using Hierarchy Analysis Method, ask for most suitable energy-storage system and participate in frequency modulation Proportional coefficient K P, consider energy storage side
With the interests such as power grid side, energy-storage system auxiliary frequency modulation pricing mechanism is established, it includes the following steps：
1) energy-storage system participates in frequency modulation Proportional coefficient KPSelection
Energy-storage system participates in frequency modulation Proportional coefficient KPSelection using analytic hierarchy process (AHP) structural model, analytic hierarchy process (AHP) structure
Model is generally divided into three layers, and top layer is destination layer, and lowest level is solution layer, and centre is rule layer or indicator layer, is selected optimal
Kp is top layer's destination layer, and frequency improvement, energy-storage system configuration capacity, maximum charge-discharge electric power and energy-storage system move
Make the time as middle layer rule layer, alternative Kp is lowest level solution layer；
If certain layer has n factor, to compare the influence degree of a certain criterion or target to last layer, determine phase in this layer
For the proportion shared by a certain criterion, i.e., the influence degree of n factor a certain target to upper strata is sorted, above-mentioned comparison is two-by-two
The comparison carried out between factor takes 1~9 scale, uses a when comparingijRepresent comparison knot of i-th of factor relative to j-th of factor
Fruit, then matrix A be known as pairwise comparison matrix；
In pairwise comparison matrix A, if aik*akj=aij, then A is known as consistent battle array, if pairwise comparison matrix is consistent battle array,
Then take the normalization characteristic vector { w corresponding to Maximum characteristic root n1,w2,…wn, andwiRepresent i-th of factor of lower floor
To the weights of upper strata factor influence degree；
If pairwise comparison matrix is not consistent battle array, by the use of the corresponding normalization characteristic vectors of its Maximum characteristic root λ as power to
W is measured, then Aw=λ w, w={ w1,w2,…wn, by the use of the corresponding feature vector of maximum eigenvalue as being compared factor to upper strata
The weight vector of factor influence degree, inconsistent degree is bigger, and caused error in judgement is bigger, thus with the size of λ-n numerical value
It weighs the inconsistent degree of A, defines coincident indicator CI to weigh its inconsistent degree：
Wherein n is the sum of diagonal entry of A, is also the sum of characteristic root of A, and λ is the Maximum characteristic root of A；
500 pairwise comparison matrix A of random configuration1,A2,…A500, then coincident indicator CI is obtained1, CI2…CI500, definition
Random index RI：
Generally, work as consistency ratioWhen, it is believed that the inconsistent degree of A is returned within permissible range with it
One changes feature vector as weight vector, otherwise to reconfigure in pairs relatively matrix, A is adjusted；
Determine sequencing weight process of certain layer of all factors for general objective relative importance, referred to as total hierarchial sorting, from
It is top to be successively ranked up to the bottom, A layers of m factor A1,A2,…Am, a is ordered as to general objective Z1,a2,…am, B layers
N factor is A to factor in the A of upper stratajMode of Level Simple Sequence be b1j,b2j,…,bnj(j=1,2 ..., m)；
B layers of total hierarchial sorting is i-th of factor to the weights of general objectiveIf B layers of B1,B2,…BmTo upper strata, i.e.,
Factor A in A layersjThe Mode of Level Simple Sequence coincident indicator of (j=1,2 ..., m) is CIj, random index RIj, then level is total
The consistency ratio of sequence：
Work as CR<When 0.1, it is believed that total hierarchial sorting is arrived this, done according to undermost total hierarchial sorting by consistency check
Go out last decision；
2) consider the mathematical model of electric system and energy-storage system overall interests
Both sides Utility of Energy, a side can be brought to energy-storage system using energy-storage system reply electric system frequency modulation demand
Face energy-storage system is coped in frequency modulation demand process by storage because equivalent load fluctuation causes frequency out-of-limit that power grid is threatened to pacify in itself
The energy storage benefit that limit by row part for the national games is brought, another aspect energy-storage system participate in electric system frequency modulation ancillary service and improve electricity
Force system safe operation, it should obtain certain auxiliary frequency modulation service revenue；
Energy-storage system copes with the charge capacity E of electric system frequency modulation demandESSIt calculates as follows：
E in formulaTime(i) it is the energy-storage system rechargeable energy value at the i-th moment, n is the charging time section of energy-storage system；
Energy-storage system copes with the auxiliary compensation electricity E of electric system frequency modulation demandBCWith adjusting depth D and regulation performance index
KpdIt is related, it calculates as follows：
EBC=D × KPd (6)
Wherein D refers to adjusting depth, is defined as the summation of certain period regulated quantity, i.e.,：
Wherein DjFor the adjusting depth of energy-storage system jth time, d adjusts number for the period；
KpdFor regulation performance index, it is defined as energy-storage system and corresponds to regulation performance index in the period, i.e.,：
Wherein K1iFor the regulations speed perunit value of energy-storage system, 1, K is generally taken1iWhat is weighed is the practical tune of the energy-storage system
Save rate degree to which compared with its standard speed that should reach；K2iStablize later adjusting essence for energy-storage system response
Degree is practical output and sets the perunit value of the difference and setting value between contributing, and generally takes 0.1, K2iWhat is weighed is energy storage system
System practical adjustments departure degree to which compared with it allows the departure reached；K3iFor electric energy management system (Energy
Management System, EMS) send out instruction after the response time of energy-storage system and the perunit value of standard response time, one
As take 0.95, K3iWhat is weighed is energy-storage system actual response time degree to which compared with standard response time；
Using energy-storage system reply electric system frequency modulation demand Utility of Energy P (E) be：
P (E)=CEEESS+CBEBC (9)
C in formulaEFor energy storage electricity networking electricity price, member/MW.h, CBElectric system frequency modulation auxiliary compensation expense is participated in for energy storage,
Member/MW.h；
It is embodied in using the environmental benefit of energy-storage system reply electric system frequency modulation demand：Energy-storage system stores in itself
The emission reduction benefit J (E) that wind-powered electricity generation electricity is brought：
J (E)=Cf×EESS (10)
In formula, CfThe processing cost of exhaust gas is discharged for fired power generating unit production unit electric energy；
Utility of Energy, environmental benefit, the energy-storage system itself for considering safe operation of power system and energy-storage system are thrown
Money and energy-storage system operation and maintenance cost, then the income of energy-storage system be calculated as follows：
S (E)=P (E)+J (E)-ECR-PCG-EM (11)
In formula, S is the income of energy-storage system, first；Capacity configurations of the E for energy-storage system, MWh；P is the tune of energy-storage system
Maximum charge-discharge electric power, MW during frequency；CRFor the capacity price of energy-storage system, member/MWh；CGPower valency for energy-storage system
Lattice, member/MW；M be energy-storage system operation and maintenance cost, member/MWh/ times.
A kind of energy-storage system of the present invention copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method, passes through foundation
Energy-storage system cope with the evaluation index of high wind-powered electricity generation permeability electric system frequency modulation demand, energy storage system is chosen using analytic hierarchy process (AHP)
System participates in frequency modulation Proportional coefficient KP, consider the advantage factors such as energy-storage system side, power grid side, different type energy storage is established in research
Power station participates in electric system frequency modulation ancillary service pricing mechanism, and the wind-powered electricity generation for improving existing power grid receives ability and system operation safety
Property, there is the advantages that methodological science, strong applicability, effect is good.
Description of the drawings
Fig. 1 analytic hierarchy process (AHP) structural models；
Fig. 2 is top successively to sort schematic diagram to the bottom.
Specific embodiment
Coping with high wind-powered electricity generation permeability system frequency modulation to a kind of energy-storage system of the present invention below with drawings and examples needs
Effect assessment method is asked to be described further.
A kind of energy-storage system of the present invention copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method, including following
Step：
1) energy-storage system participates in frequency modulation Proportional coefficient KPSelection
Using analytic hierarchy process (AHP) structural model, the analytic hierarchy process (AHP) structural model is three layers, and top layer is destination layer,
Lowest level is solution layer, and centre is rule layer or indicator layer, selects optimal Kp as top layer's destination layer, frequency improvement, storage
Can system configuration capacity, maximum charge-discharge electric power and energy-storage system actuation time be middle layer rule layer, alternative Kp
For lowest level solution layer, as shown in Figure 1.
If certain layer has n factor, to compare the influence degree of a certain criterion or target to last layer, determine phase in this layer
For the proportion shared by a certain criterion, i.e., the influence degree of n factor a certain target to upper strata is sorted, above-mentioned comparison is two-by-two
The comparison carried out between factor takes 1~9 scale, uses a when comparingijRepresent comparison knot of i-th of factor relative to j-th of factor
Fruit, then matrix A be known as pairwise comparison matrix, it is as shown in table 1 to compare 1~9 scale meaning of scale；
Table 1 compares scale explanation
In pairwise comparison matrix A, if aik*akj=aij, then A is known as consistent battle array, if pairwise comparison matrix is consistent battle array,
Then take the normalization characteristic vector { w corresponding to Maximum characteristic root n1,w2,…wn, andwiRepresent i-th of factor of lower floor
To the weights of upper strata factor influence degree；
If pairwise comparison matrix is not consistent battle array, by the use of the corresponding normalization characteristic vectors of its Maximum characteristic root λ as power to
W is measured, then Aw=λ w, w={ w1,w2,…wn, by the use of the corresponding feature vector of maximum eigenvalue as being compared factor to upper strata
The weight vector of factor influence degree, inconsistent degree is bigger, and caused error in judgement is bigger, thus with the size of λ-n numerical value
To weigh the inconsistent degree of A, definition coincident indicator such as (2) formula：
Wherein n is the sum of diagonal entry of A, is also the sum of characteristic root of A, and λ is the Maximum characteristic root of A；
500 pairwise comparison matrix A of random configuration1,A2,…A500, then coincident indicator CI is obtained1, CI2…CI500, definition
Random index RI such as (3) formula：
The numerical value of random index RI is as shown in table 2.
2 random index numerical value of table
Work as consistency ratioWhen, it is believed that the inconsistent degree of A is special with its normalization within permissible range
Otherwise sign vector will reconfigure in pairs relatively matrix, A is adjusted as weight vector；
Determine sequencing weight process of certain layer of all factors for general objective relative importance, referred to as total hierarchial sorting, from
It is top to be successively ranked up to the bottom, A layers of m factor A1,A2,…Am, a is ordered as to general objective Z1,a2,…am, B layers
N factor is A to factor in the A of upper stratajMode of Level Simple Sequence be b1j,b2j,…,bnj(j=1,2 ..., m)；It is top to arrive most bottom
Successively sequence schematic diagram is as shown in Figure 2 for layer.
B layers of total hierarchial sorting is i-th of factor to the weights of general objectiveIf B layers of B1,B2,…BmTo upper strata, i.e.,
Factor A in A layersjThe Mode of Level Simple Sequence coincident indicator of (j=1,2 ..., m) is CIj, random index RIj, then level is total
The consistency ratio of sequence such as (4) formula：
Work as CR<When 0.1, it is believed that total hierarchial sorting arrives this, according to the layer of lowest level, i.e. decision-making level by consistency check
Last decision is made in secondary total sequence；
2) consider the mathematical model of electric system and energy-storage system overall interests
Both sides Utility of Energy, a side can be brought to energy-storage system using energy-storage system reply electric system frequency modulation demand
Face energy-storage system is coped in frequency modulation demand process by storage because equivalent load fluctuation causes frequency out-of-limit that power grid is threatened to pacify in itself
The energy storage benefit that limit by row part for the national games is brought, another aspect energy-storage system participate in electric system frequency modulation ancillary service and improve electricity
Force system safe operation, it should obtain certain auxiliary frequency modulation service revenue；
Energy-storage system copes with the charge capacity E of electric system frequency modulation demandESSCalculate such as (5) formula：
E in formulaTime(i) it is the energy-storage system rechargeable energy value at the i-th moment, n is the charging time section of energy-storage system；
Energy-storage system copes with the auxiliary compensation electricity E of electric system frequency modulation demandBCWith adjusting depth D and regulation performance index
KpdIt is related, calculate such as (6) formula-(8) formula：
EBC=D × KPd (6)
Wherein D refers to adjusting depth, is defined as the summation of certain period regulated quantity, i.e.,：
Wherein DjFor the adjusting depth of energy-storage system jth time, d adjusts number for the period；
KpdFor regulation performance index, it is defined as energy-storage system and corresponds to regulation performance index in the period, i.e.,：
Wherein K1iFor the regulations speed perunit value of energy-storage system, 1, K is generally taken1iWhat is weighed is the practical tune of the energy-storage system
Save rate degree to which compared with its standard speed that should reach；K2iStablize later adjusting essence for energy-storage system response
Degree is practical output and sets the perunit value of the difference and setting value between contributing, and generally takes 0.1, K2iWhat is weighed is energy storage system
System practical adjustments departure degree to which compared with it allows the departure reached；K3iFor electric energy management system (Energy
Management System, EMS) send out instruction after the response time of energy-storage system and the perunit value of standard response time, one
As take 0.95, K3iWhat is weighed is energy-storage system actual response time degree to which compared with standard response time；
Using energy-storage system reply electric system frequency modulation demand Utility of Energy P (E) be：
P (E)=CEEESS+CBEBC (9)
C in formulaEFor energy storage electricity networking electricity price, member/MWh, CBElectric system frequency modulation auxiliary compensation is participated in for energy storage to take
With member/MWh；
It is embodied in using the environmental benefit of energy-storage system reply electric system frequency modulation demand：Energy-storage system stores in itself
The emission reduction benefit J (E) that wind-powered electricity generation electricity is brought：
J (E)=Cf×EESS (10)
In formula, CfThe processing cost of exhaust gas is discharged for fired power generating unit production unit electric energy；
Utility of Energy, environmental benefit, the energy-storage system itself for considering safe operation of power system and energy-storage system are thrown
The operation and maintenance cost of money and energy-storage system, then the income of energy-storage system is by the calculating of (11) formula：
S (E)=P (E)+J (E)-ECR-PCG-EM (11)
In formula, S is the income of energy-storage system, first；Capacity configurations of the E for energy-storage system, MWh；P is the tune of energy-storage system
Maximum charge-discharge electric power, MW during frequency；CRFor the capacity price of energy-storage system, member/MWh；CGPower valency for energy-storage system
Lattice, member/MW；M be energy-storage system operation and maintenance cost, member/MWh/ times.
The present embodiment was most worth with the fluctuation of Liaoning electric power grid wind power for data, based on Northeast China Power Grid maximum operation side in 2014
Formula into line frequency simulation calculation, and utilizes energy-storage system frequency modulation, chooses multigroup energy-storage system frequency modulation value, utilize analytic hierarchy process (AHP)
Choose optimal KP, with the economical assessment models of energy-storage system, calculate different type energy-storage system electric system frequency modulation ancillary service
Price, and carry out replacement comparison with traditional fired power generating unit frequency modulation.
Embodiment design conditions are described as follows：
1) the rate for incorporation into the power network C of energy-storage systemEBy 600 yuan/(MW.h) calculating, regulation performance index KpdIt is calculated by formula (8)
It obtains, takes 14.04；
2) the environmental benefit C of energy-storage systemfBy 230 yuan/(MW.h) calculating；
3) assume flywheel energy storage, super capacitor, lithium battery, the power of all-vanadium flow battery energy-accumulating medium, capacitance grade all
It disclosure satisfy that frequency modulation demand, efficiency for charge-discharge, cycle-index, power cost, Capacity Cost and the operating cost of each energy-accumulating medium
3 are shown in Table, dollar currency rate takes 6.51.
3 three types energy-storage system techno-economic comparison of table
Under above-mentioned design conditions, using the method for the present invention to coping with high wind-powered electricity generation permeability electric system tune with energy-storage system
The result of frequency demand effect assessment is as follows：
Energy-storage system participates in frequency modulation Proportional coefficient KPSelection
K is selected first with analytic hierarchy process (AHP)PValue, using analytic hierarchy process (AHP) structural model, the analytic hierarchy process (AHP) knot
Structure model be three layers, top layer is destination layer, and lowest level is solution layer, and centre is rule layer or indicator layer, select optimal Kp for
Top layer's destination layer, when frequency improvement, energy-storage system configuration capacity, maximum charge-discharge electric power and energy-storage system act
Between for middle layer rule layer, alternative Kp is lowest level solution layer, as shown in Figure 1.
Determine sequencing weight process of certain layer of all factors for general objective relative importance, referred to as total hierarchial sorting, from
It is top to be successively ranked up to the bottom, A layers of m factor A1,A2,…Am, a is ordered as to general objective Z1,a2,…am, B layers
N factor is A to factor in the A of upper stratajMode of Level Simple Sequence be b1j,b2j,…,bnj(j=1,2 ..., m)；It is top to arrive most bottom
Successively sequence schematic diagram is as shown in Figure 2 for layer.
The first step is to establish pairwise comparison matrix of the rule layer to destination layer, and be set as matrix A.It is participated in using energy-storage system
Frequency modulation, frequency are one of important indicators of power quality, and energy-storage system participates in the exactly system frequency that frequency modulation is primarily upon
Improvement.While considering to improve frequency improvement, the capacity of energy-storage system is also particularly significant, with energy-storage system
Cost is closely related.Secondly, the maximum actuation power of energy-storage system equally affects the economy of energy-storage system.Finally, energy storage
The actuation time of system has reacted energy-storage system to a certain extent improves the effect of frequency.In conclusion the power of four factors
Weight such as table 4.
4 energy-storage system of table participates in chirp parameter weight
Pairwise comparison matrix A of the rule layer to destination layer can be obtained by table 5.
Second step establishes pairs of relatively judgment matrix, and be set as matrix of the solution layer to rule layer：Frequency improvement with
The pairs of relatively judgment matrix of rule layer is B1；Energy storage system capacity and rule layer it is pairs of relatively judgment matrix be B2, energy storage system
Unite watt level and rule layer it is pairs of relatively judgment matrix be B3, the pairs of comparison of energy-storage system actuation time and rule layer sentences
Disconnected matrix is B4。
Energy-storage system participates in frequency modulation compared with no energy-storage system participates in frequency modulation, will certainly improve the size of system frequency, and
Energy-storage system actuation time is compartmentalization, and during energy-storage system acts participation frequency modulation, the frequency moment is all changing.
5 difference K of tablePEnergy-storage system charge-discharge electric power, actuation time, configuration capacity relationship
One of the size of energy-storage system change maximum frequency point minimum point as energy-storage system participation frequency modulation effect is commented by table 5
Energy-storage system is denoted as O by valency index in the average value of frequency size that maximum frequency point and frequency minimum point improven(n=1,2,3,4,
5) when representing different parameters respectively, average value that frequency improves), if
Obtained matrix B1It is as follows.
The evaluation index of charging capacity and discharge capacity maximum value as energy-storage system in energy-storage system action process is taken,
Maximum capacity is the smaller the better.Maximum capacity in energy-storage system action process is denoted as P by table 5n(n=1,2,3,4,5), ifObtain matrix B2：
Charge power and evaluation index of the discharge power maximum value as energy-storage system in energy-storage system action process are taken,
Maximum service rating is the smaller the better.Power maximum value in energy-storage system action process is denoted as Q by table 5n(n=1,2,3,4,5)
IfObtain matrix B3：
Energy-storage system actuation time is also to weigh the index that energy-storage system participates in frequency modulation.The shorter its actuation time the better.By table
Energy-storage system actuation time is denoted as R by 5n(n=1,2,3,4,5), if
Obtain matrix B4：
Third step is Mode of Level Simple Sequence and consistency check.[V, D]=eig (A), [V, D]=eig are instructed by matlab
(B1), [V, D]=eig (B2), [V, D]=eig (B3), [V, D]=eig (B4) solve V, D matrix, so as to obtain respectively：
Maximum eigenvalue, feature vector, the feature vector after normalization.I.e.：Maximum eigenvalue is greatest member on D matrix diagonal.
Feature vector is the first row of V matrixes.Normalized processing method：If feature vector, X={ X1X2……Xn, then after normalizing
Feature vector be：By calculating, Mode of Level Simple Sequence level consistency check table such as 6 institute of table
Show,
6 Mode of Level Simple Sequence level consistency of table is examined
Seen by table 6, C.R. is respectively less than 0.1, and consistency check all passes through.
4th step is to calculate the total sequencing weight of level and consistency check.The control strategy of Kp=45 is to the weights of general objective
For：0.6178 × 0.1578+0.2103 × 0.2741+0.1226 × 0.2731+0.0493 × 0.1984=0.1984.
Kp=55, Kp=65, Kp=75 are similarly obtained, the weights of Kp=85 are respectively：0.1931,0.2031,0.2057,
0.1997。
Total hierarchial sorting consistency check is calculated according to formula (4)：
Total hierarchial sorting passes through consistency check.Weight is maximum when KP takes 75, therefore it is final control strategy ratio to choose 75
Example coefficient.
K is checked in by table 5PThe corresponding charging capacity of energy-storage system is 0.1396MW.h when taking 75, and energy-storage system puts an appearance
Measure as 0.1005MW.h, energy-storage system during acting maximum charge-discharge electric power be 17.209MW, with reference to filling for various energy storage types
Discharging efficiency η, you can calculate the final of energy-storage system and be benefited.
7 all types of energy-accumulating medium econmics comparisons of table
Be member/MW time by the power cost of energy storage types different in table 7, Capacity Cost, operating cost conversion, it is first/
MWh times and member/MWh times can calculate each energy-accumulating medium charge capacity, adjust depth, auxiliary compensation electricity, electricity
C when dose-effect benefit, emission reduction benefit and energy-storage system balance between revenue and expenditureBValue.
The income that it is calculated is as shown in table 8.
8 all types of energy-storage system incomes of table
As can be seen from Table 8 with current energy-storage system cost calculation, to make energy-storage system balance between revenue and expenditure, energy storage participates in electricity
Force system frequency modulation auxiliary compensation expense is high.In four kinds of energy storage types, frequency modulation auxiliary compensation network minimal is super capacitor, storage
The energy break-even reimbursement for expenses of system is 2842.61 yuan/MWh.Secondly flywheel energy storage, the break-even benefit of energy-storage system
Expense is repaid as 3939.02 yuan/MWh, the break-even reimbursement for expenses of energy-storage system of all-vanadium flow battery for 12608.68 yuan/
MWh, the break-even reimbursement for expenses of energy-storage system of lithium battery is 33228.43 yuan/MWh.In conclusion it uses at present
The energy-storage system auxiliary frequency modulation reimbursement for expenses of energy-storage system reply electric system frequency modulation demand is still higher, if it is considered that energy storage system
System substitutes reimbursement for expenses if traditional fired power generating unit participation frequency modulation gives certain economic compensation and will decrease.
Design conditions, legend, table in the embodiment of the present invention etc. are only used for that the present invention is further illustrated, not thoroughly
It lifts, does not form the restriction to claims, the enlightenment that those skilled in the art obtain according to embodiments of the present invention,
Other substantially equivalent replacements are would occur to without creative work, are all fallen in the scope of protection of the present invention.
Claims (1)
1. a kind of energy-storage system copes with high wind-powered electricity generation permeability system frequency modulation demand effect assessment method, it is characterized in that, it include with
Lower step：
1) energy-storage system participates in frequency modulation Proportional coefficient KPSelection
Energy-storage system participates in frequency modulation Proportional coefficient KPSelection using analytic hierarchy process (AHP) structural model, analytic hierarchy process (AHP) structural model
It is divided into three layers, top layer is destination layer, and lowest level is solution layer, and centre is rule layer or indicator layer, and it is most upper to select optimal Kp
Layer destination layer, frequency improvement, energy-storage system configuration capacity, maximum charge-discharge electric power and energy-storage system actuation time be
Middle layer rule layer, alternative Kp are lowest level solution layer；
If certain layer has n factor, to compare the influence degree of a certain criterion or target to last layer, determine in this layer relative to
Proportion shared by a certain criterion sorts the influence degree of n factor a certain target to upper strata, above-mentioned comparison is factor two-by-two
Between the comparison that carries out, 1~9 scale is taken when comparing, uses aijRepresent comparison result of i-th of factor relative to j-th of factor, then
Matrix A is known as pairwise comparison matrix；
In pairwise comparison matrix A, if aik*akj=aij, then A be known as consistent battle array, if pairwise comparison matrix is consistent battle array, take
Corresponding to the normalization characteristic vector { w of Maximum characteristic root n1,w2,…wn, andwiRepresent i-th of factor of lower floor to upper
The weights of certain factor influence degree of layer；
If pairwise comparison matrix is not consistent battle array, by the use of the corresponding normalization characteristic vectors of its Maximum characteristic root λ as weight vector w,
Then Aw=λ w, w={ w1,w2,…wn, by the use of the corresponding feature vector of maximum eigenvalue as being compared factor to upper strata factor
The weight vector of influence degree, inconsistent degree is bigger, and caused error in judgement is bigger, thus is weighed with the size of λ-n numerical value
The inconsistent degree of A is measured, defines coincident indicator CI to weigh its inconsistent degree：
Wherein n is the sum of diagonal entry of A, is also the sum of characteristic root of A, and λ is the Maximum characteristic root of A；
500 pairwise comparison matrix A of random configuration1,A2,…A500, then coincident indicator CI is obtained1, CI2…CI500, define random one
Cause property index RI：
Work as consistency ratioWhen, it is believed that the inconsistent degree of A within permissible range, with its normalization characteristic to
Otherwise amount will reconfigure in pairs relatively matrix, A is adjusted as weight vector；
Sequencing weight process of certain layer of all factors for general objective relative importance, referred to as total hierarchial sorting are determined, from highest
Layer is successively ranked up to the bottom, A layers of m factor A1,A2,…Am, a is ordered as to general objective Z1,a2,…am, B layers n
Factor is A to factor in the A of upper stratajMode of Level Simple Sequence be b1j,b2j,…,bnj(j=1,2 ..., m)；
B layers of total hierarchial sorting is i-th of factor to the weights of general objectiveIf B layers of B1,B2,…BmTo upper strata, i.e. A layers
Middle factor AjThe Mode of Level Simple Sequence coincident indicator of (j=1,2 ..., m) is CIj, random index RIj, then level always arrange
The consistency ratio of sequence：
Work as CR<When 0.1, it is believed that total hierarchial sorting is arrived this, made most according to undermost total hierarchial sorting by consistency check
Decision afterwards；
2) consider the mathematical model of electric system and energy-storage system overall interests
Both sides Utility of Energy can be brought to energy-storage system using energy-storage system reply electric system frequency modulation demand, is on the one hand stored up
Energy system is coped in frequency modulation demand process by storage because equivalent load fluctuation causes frequency out-of-limit to threaten power grid security fortune in itself
The energy storage benefit that limit by row part is brought, another aspect energy-storage system participate in electric system frequency modulation ancillary service and improve power train
System safe operation, it should obtain certain auxiliary frequency modulation service revenue；
Energy-storage system copes with the charge capacity E of electric system frequency modulation demandESSIt calculates as follows：
E in formulaTime(i) it is the energy-storage system rechargeable energy value at the i-th moment, n is the charging time section of energy-storage system；
Energy-storage system copes with the auxiliary compensation electricity E of electric system frequency modulation demandBCWith adjusting depth D and regulation performance index KpdHave
It closes, calculates as follows：
EBC=D × KPd (6)
Wherein D refers to adjusting depth, is defined as the summation of certain period regulated quantity, i.e.,：
Wherein DjFor the adjusting depth of energy-storage system jth time, d adjusts number for the period；
KpdFor regulation performance index, it is defined as energy-storage system and corresponds to regulation performance index in the period, i.e.,：
Wherein K1iFor the regulations speed perunit value of energy-storage system, 1, K is taken1iWhat is weighed is the energy-storage system practical adjustments rate and its
The standard speed that should reach compares degree to which；K2iStablize later degree of regulation for energy-storage system response, be actually to go out
The perunit value of difference and setting value between power and setting output, takes 0.1, K2iWhat is weighed is energy-storage system practical adjustments departure
The degree to which compared with it allows the departure reached；K3iThe response of energy-storage system after instruction is sent out for electric energy management system
Time and the perunit value of standard response time, take 0.95, K3iWhat is weighed is the energy-storage system actual response time and normal response
Time compares degree to which；
Using energy-storage system reply electric system frequency modulation demand Utility of Energy P (E) be：
P (E)=CEEESS+CBEBC (9)
C in formulaEFor energy storage electricity networking electricity price, member/MW.h, CBFor energy storage participate in electric system frequency modulation auxiliary compensation expense, member/
MW.h；
It is embodied in using the environmental benefit of energy-storage system reply electric system frequency modulation demand：Energy-storage system stores wind-powered electricity generation in itself
The emission reduction benefit J (E) that electricity is brought：
J (E)=Cf×EESS (10)
In formula, CfThe processing cost of exhaust gas is discharged for fired power generating unit production unit electric energy；
Consider the Utility of Energy of safe operation of power system and energy-storage system, environmental benefit, energy-storage system itself investment with
And the operation and maintenance cost of energy-storage system, then the income of energy-storage system be calculated as follows：
S (E)=P (E)+J (E)-ECR-PCG-EM (11)
In formula, S is the income of energy-storage system, first；Capacity configurations of the E for energy-storage system, MWh；P is the frequency modulation phase of energy-storage system
Between maximum charge-discharge electric power, MW；CRFor the capacity price of energy-storage system, member/MWh；CGFor the power price of energy-storage system, member/
MW；M be energy-storage system operation and maintenance cost, member/MWh/ times.
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