CN108199399A - Grid side and the energy-storage system of accumulator economy model of new energy side - Google Patents
Grid side and the energy-storage system of accumulator economy model of new energy side Download PDFInfo
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- CN108199399A CN108199399A CN201810026085.9A CN201810026085A CN108199399A CN 108199399 A CN108199399 A CN 108199399A CN 201810026085 A CN201810026085 A CN 201810026085A CN 108199399 A CN108199399 A CN 108199399A
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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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Abstract
The invention discloses a kind of energy-storage system of accumulator economy model assessed respectively from grid side and new energy Power Plant Side, for assessing the economy of investment energy-storage system of accumulator, to push its commercial applications and development.The model includes grid side model and new energy Power Plant Side model, wherein grid side model includes low storage arbitrage occurred frequently, reduces conventional spare capacity, reduce grid power blackout loss, reduce grid net loss, delay five aspect benefits such as power grid upgrading investment, and investment construction and operation and maintenance two parts cost, new energy Power Plant Side model include reducing the four part benefits such as the low storage arbitrage occurred frequently under generation of electricity by new energy spinning reserve capacity, the environmental benefit built capacity, reduce carbon emission for reducing new-energy grid-connected channel, imaginary peak valley rate for incorporation into the power network.Comprehensive to the benefit of energy-storage system of accumulator and quantization the present invention is based on different investment subjects to analyze, so as to make up, existing model effciency analysis is not comprehensive enough, is difficult to the deficiency calculated.
Description
Technical field
The present invention relates to the economic evaluation field of energy-storage system of accumulator in power industry, specifically respectively from grid side
With new energy Power Plant Side to the benefit of energy-storage system of accumulator and cost comprehensive analysis.
Background technology
Batteries to store energy technology due to its floor space is small, energy density is high, have extended cycle life the advantages that obtained extensively
Development and research, be gradually applied to the links of electric system, peak load shifting, ancillary service can be played, improve and supply
Electric reliability improves the effects that power quality.However further to realize commercialization promotion and application, how to evaluate accumulator storage
The economy of energy is the emphasis of research.In electric system, the investment subject of batteries to store energy can be divided into grid company, new energy
Power plant and user, wherein new energy Power Plant Side and grid side take centralized extensive configuration energy storage, and user side is then distributed
Access energy storage.
Domestic energy-storage system of accumulator is now arranged in the demonstrative project stage, commercialization is also not implemented, mainly to accumulator
Can energy-storage system get a profit uncertain.It is a sufficiently complex engineering to establish energy-storage system of accumulator economic evaluation model,
It not only needs to further investigate batteries to store energy technology, while the present situation of power grid and development trend is also wanted to have specific understanding.Its
Complexity protrusion is embodied in：（1）Energy-storage system of accumulator can bring many benefits, as low storage arbitrage occurred frequently, reduction are conventional standby
With capacity, reduce grid power blackout loss, reduction grid net loss etc., it is difficult to consider comprehensive；（2）Part benefit is difficult to specifically quantify,
Qualitative assessment has difficulties.
By the retrieval analysis to existing technical literature, the economy model of existing energy-storage system of accumulator be primarily present with
Lower deficiency：
1. income that pair energy storage is brought considers not comprehensive, such as reduce loss of outage without meter and energy storage, energy storage reduces grid loss,
Energy storage reduces the economic benefit of carbon emission etc.；
2. Most models are using power grid as investment subject, research or even right is lacked for the incomes main body such as generation of electricity by new energy quotient
Different investment subjects are not distinguished explicitly；
3. the specific assessment mode of existing economy model is excessively complicated, quantization and calculation are difficult to reality in Practical Project
It is existing, without practical operation.
Invention content
For the problems in above-mentioned background technology, the present invention provides one kind to be based on different investment subjects（Power grid, new energy
Power plant）Energy-storage system of accumulator economic evaluation model, respectively from grid side and new energy Power Plant Side to batteries to store energy system
The benefit and cost of system are studied.
Assessment models of the present invention are included with lower part：
1st, energy storage configuration is in the economy model of grid side
1.1 Benefit Model
（1）Low storage arbitrage occurred frequently
Using time-of-use tariffs, energy storage device realizes its dominant economy during buying in, selling at high price at a low price for China sale side
Income.This part year benefit E1It is represented by：
（1）
Wherein：N is the annual charge and discharge cycles number of energy storage device；It was divided into m period, P by one dayi +、Pi -Respectively the i-th period
Energy storage electric discharge and charge power；eiTime-of-use tariffs for the i-th period.
（2）Reduce conventional spare capacity
Batteries to store energy device can replace spare capacity of the normal power supplies as generation of electricity by new energy etc..This part energy storage device generation
For the income E of spare capacity expenditure2It is represented by：
（2）
Wherein, PmaxFor energy storage device rated power；T is energy storage device with power PmaxThe duration of charging（h）；esFor unit
The price of spare capacity（Ten thousand yuan/MW）；E (SOC) is the mathematic expectaion of SOC (State of Charge, state-of-charge).
（3）Reduce grid power blackout loss
Electric network reliability cost may be defined as power supply department for make power grid reach certain power supply reliability it is horizontal need it is increased into
This.Energy storage device is applied can improve power grid power supply reliability in power grid, and it is to reach identical power supply accordingly to save power grid
Reliability and required investment also correspond to the benefit that energy storage device reduces regional loss of outage.The present invention passes through outage cost
Assessment Rate assesses this part benefit E3。
（3）
Wherein, ASFor system outage rate every year on average；RIEAFor Custom interruption cost Assessment Rate（Ten thousand yuan/MWh）, can use this area
The GDP output value approximate substitutions of unit quantity of electricity.
（4）Reduce grid net loss
Energy-storage system is equivalent to load in load valley charging, increases system loading, so that network loss during system paddy lotus increases
Add；It discharges in load peak, reduces the power of system transmission so that network loss during system peak load is reduced.Research shows that energy storage is made
Into network loss decrement be more than its caused power loss increment.If average active power is P during load valleyl, reactive power α
Pl, average active and reactive power during load peak is respectively β Pl、αβPl.Then this part annual earnings E4For：
（4）
Wherein ehAnd elIt Wei not peak load and Gu He period electricity prices；Th、TlRespectively peak load and Gu He average durations；ηh、ηlPoint
It Wei not peak load and the charged net active power loss rate of paddy.
（5）Delay power grid upgrading investment
When being more than capacity of trunk due to network load or new-energy grid-connected transmission capacity, need to upgrade power grid and extend.Energy storage
Device can realize the utilization rate that circuit is improved in load valley, power on the spot in load peak and reduce transimission power, with
This substitutes traditional power grid upgrading measure, delays the investment of line and transformer etc..Effect in terms of power grid enlarging capacity is reduced
Beneficial E5For：
（5）
Wherein：Pc=Pimax-PaTo even up the critical power needed for load curve, PimaxFor daily load maximum value, PaIt is per day
Load；CdUnit price for user's controller switching equipment（Ten thousand yuan/MW）；λdFixed assets depreciation rate for user's controller switching equipment；η is
The energy storage efficiency of energy storage device, the charge and discharge electrical loss of loss and accumulator including grid-connection device.
1.2 cost model
The cost of energy storage device mainly includes the investment construction cost and operation expense of energy storage device.Wherein investment is built
It is set as this and mainly includes site construction cost, grid-connection device cost and battery system cost etc., such as formula（6）, energy storage device
Annual operation expense such as formula（7）：
（6）
（7）
Wherein：CfFor site construction cost（Wan Yuan）；KPUnit price for new energy electric energy converting equipment（Ten thousand yuan/MW）；KWFor
The unit price of energy storage device（Ten thousand yuan/MWh）；λPFor fixed assets depreciation rates such as site and grid-connection devices；λWConsolidate for accumulator group
Determine the allowance for depreciation of assets；CmEnergy-storage system year O＆M cost for unit capacity（Ten thousand yuan/MW）.
1.3 economic evaluation models
To sum up, energy storage configuration is in the Economic Analysis Model of grid side：
（8）
2nd, energy storage configuration is in the economy model of new energy Power Plant Side
2.1 Benefit Model
（1）Reduce generation of electricity by new energy spinning reserve capacity
After the randomness of generation of electricity by new energy leads to new-energy grid-connected, new energy electric field forecast is contributed and reality is contributed there are deviation,
This causes system to need to be equipped with corresponding spinning reserve capacity, this portion capacity is determined by new energy electric field output reliability forecasting
It is fixed.After being configured with the energy storage device of certain capacity, energy storage device can adjust new energy electric field output, reduce reliability forecasting and lead
The deviation of cause so as to reduce the spinning reserve capacity being equipped with needed for system, obtains corresponding economic benefit：
（9）
In formula：ec,iFor the spare capacity price in the i-th period（Ten thousand yuan/MW）；X is the reliability forecasting of new energy electric field；PW,i
For output of the new energy electric field within the i-th period.
（2）Reduce the construction capacity of new-energy grid-connected channel
The grid-connected channel capacity of new energy power supply is planned that energy storage device can be smooth according to the maximum value of typical daily output
New energy power supply power curve, so as to reduce the required grid-connected channel built.The cost of saving depends primarily on power curve and puts down
The difference of sliding front and rear power peak, can be expressed as：
（10）
In formula：λWAllowance for depreciation for energy-storage system fixed assets；KCUnit price for grid-connected channel（Ten thousand yuan/MW）.
（3）Reduce the environmental benefit of carbon emission
The new energy such as photovoltaic, wind-powered electricity generation are green energy resources, have the characteristics that reduce GHG carbon dioxide discharge.And energy storage device
It participates in new energy side to use, the output of new energy can be increased, reduce the output of coal unit, carbon emission is reduced so as to reach
Effectiveness.Carbon emission trade market is to promote Global Green House Gas Emissions Reduction, reducing market used by global carbon dioxide discharge
Mechanism.China has 7 main carbon emission exchanges at present：Guangzhou carbon emissions trading institute, Shenzhen three human emission scenarios institute, north
Capital environment exchange, Shanghai environmental energy exchange, Hubei carbon emissions trading institute, Tianjin three human emission scenarios institute and Chongqing carbon row
It delegates power exchange.With the continuous exploration and development in carbon transaction market, economic benefit of the energy-storage system in terms of carbon emission is reduced
It has a high potential.This part benefit can be expressed as shown below：
（11）
In formula, EFCO2To reduce the emission reduction factor of carbon emission（Ton/MWh）, eco2Transaction value for carbon emission（Ten thousand yuan/ton）.
（4）Low storage arbitrage occurred frequently under peak valley rate for incorporation into the power network
The policy of mark post rate for incorporation into the power network is carried out for new energy power supply at present in China.Under fixed rate for incorporation into the power network mechanism, using new
Electric discharge will not generate generation of electricity by new energy quotient economic effect when electric power storage, load peak when energy-storage system in the energy realizes load valley
Benefit can not encourage it that energy storage device is taken to go to improve new energy power quality.Assuming that it is set with reference to user side time-of-use tariffs new
Energy power generation electricity price, the economic benefit that research rate for incorporation into the power network peak-valley difference is brought.Then energy-storage system is by low storage arbitrage occurred frequently
（12）
In formula, eiFor the rate for incorporation into the power network in the i-th period.
2.2 economic evaluation models
Energy storage configuration can also use formula in the cost model of new energy Power Plant Side（6）And formula（7）It represents.To sum up, new energy is configured in energy storage
The Economic Analysis Model of source Power Plant Side is
（13）.
Description of the drawings
Fig. 1 is the principle of energy-storage system of accumulator economy model assessed respectively from grid side and new energy Power Plant Side
Figure.
Fig. 2 is according to the optimal energy-storage system of accumulator configuration flow of the model realization economy.
Fig. 3 is economy numerical results of the energy storage configuration in grid side.
Fig. 4 is economy numerical results of the energy storage configuration in grid side.
Specific embodiment
The economy for how using above-mentioned model evaluation energy-storage system of accumulator is introduced with example.
1. the economy model in grid side is configured in energy storage
The economy example related data in grid side is configured in 1 energy storage of table
The related data that example is taken is as shown in table 1, passes through formula（1）—（8）, respectively calculate calculate different aspect benefit and its
Cost can obtain result as shown in Figure 3, it can be seen that the annual net income of sodium-sulphur battery is maximum, better economy.
2. the economy model in new energy Power Plant Side is configured in energy storage
The economy example related data in new energy Power Plant Side is configured in 2 energy storage of table
By taking sodium-sulfur battery energy storage system as an example, example data are as shown in table 2, according to formula（9）—（13）, obtain result such as attached drawing
Shown in 4, it can be seen that the better economy of sodium-sulfur battery energy storage system as T=2, when stored energy capacitance is 15MW, annual net income is most
Greatly.
Claims (6)
1. grid side and the energy-storage system of accumulator economy model of new energy side, it is characterised in that electricity is divided into according to investment subject
Net side and new energy Power Plant Side model；The energy-storage system of accumulator economy model of grid side includes：Low storage arbitrage occurred frequently, reduction
Conventional spare capacity reduces grid power blackout loss, reduces grid net loss, delays five aspect benefits such as power grid upgrading investment, with
And investment construction and operation and maintenance two parts cost；The energy-storage system of accumulator economy model of new energy Power Plant Side includes：Subtract
Few generation of electricity by new energy spinning reserve capacity, the construction capacity for reducing new-energy grid-connected channel, the environmental benefit for reducing carbon emission, vacation
Think the four part benefits such as the low storage arbitrage occurred frequently under peak valley rate for incorporation into the power network.
2. energy-storage system of accumulator economy model according to claim 1, which is characterized in that the new energy power plant
Side benefit is to reduce generation of electricity by new energy spinning reserve capacity, reduce building capacity, reducing carbon emission for new-energy grid-connected channel
The sum of low storage arbitrage occurred frequently under environmental benefit, imaginary peak valley rate for incorporation into the power network.
3. energy-storage system of accumulator economy model according to claim 1, which is characterized in that the grid side reduces
Active power loss rate, average duration, power factor when grid net loss income is by load valley and peak quantify.
4. energy-storage system of accumulator economy model according to claim 1, which is characterized in that the grid side is reduced
Grid power blackout loss benefit is system outage rate, the GDP output values of unit quantity of electricity, energy storage remaining capacity desired value, volume every year on average
Determine power, the product of charge and discharge time.
5. energy-storage system of accumulator economy model according to claim 1, which is characterized in that the new energy power plant
The environmental benefit that carbon emission is reduced in side is energy storage rated power, charge and discharge time, efficiency for charge-discharge, the carbon emission emission reduction factor and carbon
The product of trade market price.
6. the energy-storage system of accumulator economy model according to claim 1 to 5 any one, which is characterized in that described
Benefit and cost calculation will convert each year.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110969478A (en) * | 2019-11-01 | 2020-04-07 | 国网浙江海宁市供电有限公司 | Method for multidimensional improvement of energy storage value under new energy high-permeability background |
| CN111355250A (en) * | 2020-04-13 | 2020-06-30 | 北方工业大学 | Power grid side energy storage optimization method and system |
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2018
- 2018-01-11 CN CN201810026085.9A patent/CN108199399A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110969478A (en) * | 2019-11-01 | 2020-04-07 | 国网浙江海宁市供电有限公司 | Method for multidimensional improvement of energy storage value under new energy high-permeability background |
| CN111355250A (en) * | 2020-04-13 | 2020-06-30 | 北方工业大学 | Power grid side energy storage optimization method and system |
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