CN104794343A - Depreciation method in battery energy storage system cost whole life cycle - Google Patents

Depreciation method in battery energy storage system cost whole life cycle Download PDF

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CN104794343A
CN104794343A CN201510187893.XA CN201510187893A CN104794343A CN 104794343 A CN104794343 A CN 104794343A CN 201510187893 A CN201510187893 A CN 201510187893A CN 104794343 A CN104794343 A CN 104794343A
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energy storage
storage system
battery energy
year
cost
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CN104794343B (en
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李相俊
宁阳天
惠东
贾学翠
郭光朝
张亮
王立业
陈继忠
汪奂伶
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention discloses a depreciation method in a battery energy storage system cost whole life cycle. The method comprises the steps that battery energy storage system parameters are read; the investment cost of a battery energy storage system is computed; the equivalent annual value of battery energy storage system residual life cycle cost is computed; the fully-charging-discharging average frequency of each year of battery energy storage system residual life is computed; the investment cost of one-time full charging and discharging of the first year of battery energy storage system residual life is computed; full charging and discharging frequency of the first year of battery energy storage system residual life is computed; the investment cost depreciation amount of the first year of battery energy storage system residual life is computed; the investment cost, the fully-charging-discharging frequency and the life limit after the first year of battery energy storage system residual life are computed; and whether the battery energy storage system is fully used is judged.

Description

The depreciation method in a kind of battery energy storage system cost life cycle management
Technical field
The present invention relates to a kind of depreciation method, be specifically related to the depreciation method in a kind of battery energy storage system cost life cycle management.
Background technology
In electric system, any element all can produce corresponding financial cost.Electric power enterprise more needs as profit-generating enterprise the cost structure considering various equipment, each class component in electric system.Therefore, battery energy storage system, as the part in electric system, in practical application runs, also will consider its corresponding cost factor and cost of investment.
In concrete economic activity, the initial outlay cost of equipment needs reasonably to be reacted to its later operation.And the cost of investment of battery energy storage system is one-time investment, in order to embody cost of investment in the scheduling a few days ago of battery energy storage system, cost of investment should be converted in the cost of every day, and consider time value on assets in conversion process.
The time value is the economic limit of outwardness, and any economic activity all will be carried out in the air when specific, and the value of fund can not remain unchanged always, and it and time are closely related.If do not consider the time value, when calculating the value of resource of different time, then do not possess strong cogency.And for current fund, can use process in produce a profit, even if do not consider inflationary factor, it also can than future equal number capital more valuable.Therefore when in cost of investment depreciation to concrete scheduling a few days ago, need to consider the time value, the amount of the fund of different time being converted the same time compares.
Summary of the invention
To achieve these goals, the invention provides the depreciation method in a kind of battery energy storage system cost life cycle management, taken into full account time value on assets, facilitate the harmonious development of the first cost of battery energy storage system investment and overall long-term economics.
The object of the invention is to adopt following technical proposals to realize:
A depreciation method in battery energy storage system cost life cycle management, described method comprises the steps:
(1) battery energy storage system parameter is read;
(2) cost of investment of battery energy storage system is calculated;
(3) what calculate battery energy storage system residual life life cycle costing waits year value;
(4) battery energy storage system residual life complete discharge and recharge number of times is every year on average calculated;
(5) cost of investment of the once discharge and recharge completely of battery energy storage system residual life First Year is calculated;
(6) the complete discharge and recharge number of times of battery energy storage system residual life First Year is calculated;
(7) the cost of investment amount of depreciation of battery energy storage system residual life First Year is calculated;
(8) cost of investment after battery energy storage system residual life First Year, completely discharge and recharge number of times and the life-span time limit is calculated;
(9) judge whether battery energy storage system utilizes completely.
Preferably, described battery energy storage system parameter comprises, rated power, capacity, power cost coefficient and Capacity Cost coefficient.
Preferably, in described step (2), the cost of investment of battery energy storage system is:
C IN,total＝K INPP max+K INCC S
Wherein, K iNPfor the cost coefficient of the peak power of battery energy storage system input, output; K iNCfor the cost coefficient of battery energy storage system capacity; P maxfor battery energy storage system is to the maximal value of external power; C sfor battery energy storage system capacity.
Preferably, the year value such as grade calculating battery energy storage system residual life life cycle costing in described step (3) is:
C IN , A = C IN , total · P A ( i , n ) = ( K INP P max + K INC C S ) i ( 1 + i ) n ( 1 + i ) n - 1
Wherein, p a(i, n) is recovery of the capital coefficient, and i is annual rate, and n is the residual life of battery energy storage system.
Preferably, in described step (4), remaining for battery energy storage system complete discharge and recharge number of times is divided the residual life cycle of battery energy storage system, obtains within the residual life cycle, battery energy storage system complete discharge and recharge number of times every year on average:
m＝[M/n]
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, and [], for round to positive infinity direction, n is the residual life of battery energy storage system.
Preferably, in described step (5), the year of waiting according to battery energy storage system residual life life cycle costing is worth C iN, Awith battery energy storage system residual life complete discharge and recharge number of times m every year on average, calculating battery energy storage system in the cost of investment of the once discharge and recharge completely of residual life First Year is:
C IN,δ＝C IN,A/m。
Preferably, in described step (6), calculate the complete charge and discharge number of times of battery energy storage system residual life First Year:
m 0＝Q year,dis/C S
Wherein, Q year, disfor the battery energy storage system discharge capacity of a year, C sfor the rated capacity of battery energy storage system.
Further, in described step (7), calculate the cost of investment amount of depreciation of battery energy storage system at residual life First Year:
C IN,year＝m 0·C IN,δ
Wherein, m 0for the complete charge and discharge number of times of battery energy storage system residual life First Year; C iN, δfor battery energy storage system is in the once complete discharge and recharge cost of investment of residual life First Year.
Preferably, in described step (8), the cost of investment after described battery energy storage system residual life First Year:
C IN , F 1 = C IN , F - C IN , year = C IN , total · ( 1 + i ) n - C IN , year
Wherein, C iN, Ffor the future value of battery energy storage system cost of investment;
Complete discharge and recharge number of times after described battery energy storage system residual life First Year:
M 1 = M - Σ j = 1 N year , 1 c j
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, N year, 1represent 1 year, c jfor the cost of jth time depreciation;
According to the residual life n of battery energy storage system, obtain the life-span time limit after described battery energy storage system residual life First Year:
n 1＝n-1。
Further, described step (9) comprises, if the complete discharge and recharge number of times after described battery energy storage system residual life First Year and the life-span time limit, both become 0 by one, then this battery energy storage system is fully used, and out of service; Otherwise go to step (2).
Compared with prior art, beneficial effect of the present invention is:
The present invention, by adjusting objective function, efficiently solves different physical significance, the objective function of different dimension cannot the problem of weighting summation.By arranging different weight coefficients between the objective function and the objective function of energy storage cost of peak load shifting evaluation, solve the solution under different conditions, the i.e. charge-discharge electric power of battery energy storage system day part, to adopt different discharge and recharge scheduling strategies as required.The method has taken into full account time value on assets, facilitates the harmonious development of the first cost of battery energy storage system investment and overall long-term economics.
Accompanying drawing explanation
Fig. 1 is the depreciation method process flow diagram in a kind of battery energy storage system cost life cycle management of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, the depreciation method in a kind of battery energy storage system cost life cycle management, battery energy storage system forms primarily of electric battery, PCS, control device and transformer, and the cost produced during these equipment investments also just constitutes the cost of investment of battery energy storage system, namely buy, install the fund of equipment, the PCS needing installing to be connected with electrical network as energy-storage battery, energy-storage travelling wave tube and supervisory system etc.Wherein PCS and supervisory system determine the size of battery energy storage system output and power input, and therefore a part of cost of battery energy storage system is relevant to the watt level of its input and output, and this part can be described as power cost of investment.The amount of capacity of energy-storage battery determines another part cost of whole battery energy storage system, is called Energy investment cost.
The cost of investment of battery energy storage system is one-time investment, in order to embody cost of investment in the scheduling a few days ago of battery energy storage system, needs cost of investment to convert in the cost of every day, needs to consider time value on assets in conversion process.The time value is the economic limit of outwardness, any economic activity, all needs to carry out in the air when specific, if do not consider the time value, the value of resource calculating different time just can not obtain convictive result.The value of fund can not remain unchanged always, and it and time are closely related.For current fund, even if do not consider inflationary factor, because its can produce a profit in the process used, also can than future equal number capital more valuable, therefore need the amount of the fund of different time to convert the same time and compare.In this patent, need to consider the time value.
Described method comprises the steps:
(1) battery energy storage system parameter is read; Described battery energy storage system parameter comprises, rated power, capacity, power cost coefficient and Capacity Cost coefficient.
(2) cost of investment of battery energy storage system is calculated; In described step (2), the cost of investment of battery energy storage system is:
C IN,total＝K INPP max+K INCC S
Wherein, K iNPfor the cost coefficient of the peak power of battery energy storage system input, output; K iNCfor the cost coefficient of battery energy storage system capacity; P maxfor battery energy storage system is to the maximal value of external power; C sfor battery energy storage system capacity.
(3) what calculate battery energy storage system residual life life cycle costing waits year value; The year value such as grade calculating battery energy storage system residual life life cycle costing in described step (3) is:
C IN , A = C IN , total · P A ( i , n ) = ( K INP P max + K INC C S ) i ( 1 + i ) n ( 1 + i ) n - 1
Wherein, p a(i, n) is recovery of the capital coefficient, and i is annual rate, and n is the residual life of battery energy storage system.
(4) battery energy storage system residual life complete discharge and recharge number of times is every year on average calculated; In described step (4), remaining for battery energy storage system complete discharge and recharge number of times is divided the residual life cycle of battery energy storage system, obtains within the residual life cycle, battery energy storage system complete discharge and recharge number of times every year on average:
m＝[M/n]
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, and [], for round to positive infinity direction, n is the residual life of battery energy storage system.
(5) cost of investment of the once discharge and recharge completely of battery energy storage system residual life First Year is calculated; In described step (5), the year of waiting according to battery energy storage system residual life life cycle costing is worth C iN, Awith battery energy storage system residual life complete discharge and recharge number of times m every year on average, calculating battery energy storage system in the cost of investment of the once discharge and recharge completely of residual life First Year is:
C IN,δ＝C IN,A/m。
(6) the complete discharge and recharge number of times of battery energy storage system residual life First Year is calculated; In described step (6), calculate the complete charge and discharge number of times of battery energy storage system residual life First Year:
m 0＝Q year,dis/C S
Wherein, Q year, disfor the battery energy storage system discharge capacity of a year, C sfor the rated capacity of battery energy storage system.
(7) the cost of investment amount of depreciation of battery energy storage system residual life First Year is calculated; Further, in described step (7), calculate the cost of investment amount of depreciation of battery energy storage system at residual life First Year:
C IN,year＝m 0·C IN,δ
Wherein, m 0for the complete charge and discharge number of times of battery energy storage system residual life First Year; C iN, δfor battery energy storage system is in the once complete discharge and recharge cost of investment of residual life First Year.
(8) cost of investment after battery energy storage system residual life First Year, completely discharge and recharge number of times and the life-span time limit is calculated; In described step (8), the cost of investment after described battery energy storage system residual life First Year:
C IN , F 1 = C IN , F - C IN , year = C IN , total · ( 1 + i ) n - C IN , year
Wherein, C iN, Ffor the future value of battery energy storage system cost of investment;
Complete discharge and recharge number of times after described battery energy storage system residual life First Year:
M 1 = M - Σ j = 1 N year , 1 c j
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, N year, 1represent 1 year, c jfor the cost of jth time depreciation;
According to the residual life n of battery energy storage system, obtain the life-span time limit after described battery energy storage system residual life First Year:
n 1＝n-1。
(9) judge whether battery energy storage system utilizes completely.Described step (9) comprises, if the complete discharge and recharge number of times after described battery energy storage system residual life First Year and the life-span time limit, both become 0 by one, then this battery energy storage system is fully used, and out of service; Otherwise go to step (2).
Embodiment: the cost of investment of battery energy storage system is main relevant with capacity to the power of battery energy storage system, and the computing formula of cost of investment is as follows:
C IN,total＝K INPP max+K INCC S(1)
K in formula iNP---the cost coefficient (kW/ unit) that the peak power input to battery energy storage system, exported is relevant;
K iNC---the cost coefficient (kWh/ unit) relevant to battery energy storage system capacity;
P max---battery energy storage system is to the maximal value of external power (owing to being negative to external power during charging, therefore getting its absolute value) (kW);
C s---battery energy storage system capacity (kWh).
Suppose that the life-span of battery energy storage system is n, then the initial outlay cost conversion of battery energy storage system be wait year value cost of investment be:
C IN , A = C IN , total · Ap ( i , n ) = ( K INP P max + K INC C S ) i ( 1 + i ) n ( 1 + i ) n - 1 - - - ( 2 )
Wherein, i is annual rate; p a(i, n) represents recovery of the capital coefficient, represents the equivalent relation between the year value A such as known present worth P (occurring in First Year just) and n.
The number of times of remaining for battery energy storage system complete charge-discharge electric power is divided remaining battery energy storage system life cycle.The complete discharge and recharge number of times of 1 year is calculated as follows:
m＝[M/n] (3)
Wherein, M is the number of times of the remaining complete discharge and recharge of battery energy storage system; [] is for round to positive infinity direction.
Calculate battery energy storage system in the First Year of remaining life cycle, the cost of investment of once charge and discharge completely.
Complete charge and discharge cost C once in this year iN, δbe calculated as follows:
C IN,δ＝C IN,A/m (4)
Calculate the complete charge and discharge number of times of battery energy storage system conversion hoc anno.
m 0＝Q year,dis/C S(5)
Wherein, Q year, disrepresent the discharge electricity amount of battery energy storage system in 1 year, C srepresent the rated capacity of battery energy storage system.
Calculate the cost of investment amount of depreciation of battery energy storage system at First Year.
Cost of investment amount of depreciation is calculated as follows:
C IN,year＝m 0·C IN,δ(6)
Calculate remaining battery energy storage system cost of investment, completely discharge and recharge number of times and the life-span time limit.
Remaining battery energy storage system cost of investment:
C IN , F 1 = C IN , F - C IN , year = C IN , total · ( 1 + i ) n - C IN , year - - - ( 7 )
Wherein, C iN, Ffor the future value of battery energy storage system cost of investment.
The complete discharge and recharge number of times of remaining battery energy storage system:
M 1 = M - Σ j = 1 N year , 1 c j - - - ( 8 )
The remaining battery energy storage system life-span time limit:
n 1＝n-1(9)
Calculate , M 1, n 1after, similar with formula (2), what again calculate Second Year waits year value, and when calculating the complete operation number of times of Second Year conversion, by formula (3) to formula (5), the last annual amount of depreciation calculating this year according to formula (6), and according to formula (7), formula (8) and formula (9) calculate the surplus value of battery energy storage system, remain complete charge and discharge number of times and residual life cycle, can proceed in the battery energy storage system cost of investment depreciation calculating of the 3rd year again, the like, until the cost of investment depreciation of battery energy storage system completes or life cycle terminates, can be out of service by battery energy storage system.Concrete flow process as shown in Figure 1.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (10)

1. the depreciation method in battery energy storage system cost life cycle management, is characterized in that, described method comprises the steps:
(1) battery energy storage system parameter is read;
(2) cost of investment of battery energy storage system is calculated;
(3) what calculate battery energy storage system residual life life cycle costing waits year value;
(4) battery energy storage system residual life complete discharge and recharge number of times is every year on average calculated;
(5) cost of investment of the once discharge and recharge completely of battery energy storage system residual life First Year is calculated;
(6) the complete discharge and recharge number of times of battery energy storage system residual life First Year is calculated;
(7) the cost of investment amount of depreciation of battery energy storage system residual life First Year is calculated;
(8) cost of investment after battery energy storage system residual life First Year, completely discharge and recharge number of times and the life-span time limit is calculated;
(9) judge whether battery energy storage system utilizes completely.
2. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, is characterized in that: described battery energy storage system parameter comprises, rated power, capacity, power cost coefficient and Capacity Cost coefficient.
3. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, is characterized in that: in described step (2), the cost of investment of battery energy storage system is:
C IN,total＝K INPP max+K INCC S
Wherein, K iNPfor the cost coefficient of the peak power of battery energy storage system input, output; K iNCfor the cost coefficient of battery energy storage system capacity; P maxfor battery energy storage system is to the maximal value of external power; C sfor battery energy storage system capacity.
4. the depreciation method in the battery energy storage system cost life cycle management as described in as arbitrary in claim 1-3, is characterized in that: the year value of waiting calculating battery energy storage system residual life life cycle costing in described step (3) is:
C IN , A = C IN , total · P A ( i , n ) = ( K INP P max + K INC C S ) i ( 1 + i ) n ( 1 + i ) n - 1
Wherein, p a(i, n) is recovery of the capital coefficient, and i is annual rate, and n is the residual life of battery energy storage system.
5. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, it is characterized in that: in described step (4), remaining for battery energy storage system complete discharge and recharge number of times is divided the residual life cycle of battery energy storage system, obtain within the residual life cycle, battery energy storage system complete discharge and recharge number of times every year on average:
m＝[M/n]
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, and [], for round to positive infinity direction, n is the residual life of battery energy storage system.
6. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, is characterized in that: in described step (5), and the year of waiting according to battery energy storage system residual life life cycle costing is worth C iN, Awith battery energy storage system residual life complete discharge and recharge number of times m every year on average, calculating battery energy storage system in the cost of investment of the once discharge and recharge completely of residual life First Year is:
C IN,δ＝C IN,A/m。
7. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, is characterized in that: in described step (6), calculates the complete charge and discharge number of times of battery energy storage system residual life First Year:
m 0＝Q year,dis/C S
Wherein, Q year, disfor the battery energy storage system discharge capacity of a year, C sfor the rated capacity of battery energy storage system.
8. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 7, is characterized in that: in described step (7), calculates the cost of investment amount of depreciation of battery energy storage system at residual life First Year:
C IN,year＝m 0·C IN,δ
Wherein, m 0for the complete charge and discharge number of times of battery energy storage system residual life First Year; C iN, δfor battery energy storage system is in the once complete discharge and recharge cost of investment of residual life First Year.
9. the depreciation method in battery energy storage system cost life cycle management as claimed in claim 1, is characterized in that: in described step (8), the cost of investment after described battery energy storage system residual life First Year:
C IN , F 1 = C IN , F - C IN , year = C IN , total · ( 1 + i ) n - C IN , year
Wherein, C iN, Ffor the future value of battery energy storage system cost of investment;
Complete discharge and recharge number of times after described battery energy storage system residual life First Year:
M 1 = M - Σ j = 1 N year , 1 c j
Wherein, M is the remaining complete discharge and recharge number of times of battery energy storage system, N year, 1represent 1 year, c jfor the cost of jth time depreciation;
According to the residual life n of battery energy storage system, obtain the life-span time limit after described battery energy storage system residual life First Year:
n 1＝n-1。
10. method as claimed in claim 9, it is characterized in that, described step (9) comprises, if the complete discharge and recharge number of times after described battery energy storage system residual life First Year and the life-span time limit, both become 0 by one, then this battery energy storage system is fully used, and out of service; Otherwise go to step (2).
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