CN113178896B - Method and system for configuring installed capacity of fixed-output light-storage combined power station - Google Patents
Method and system for configuring installed capacity of fixed-output light-storage combined power station Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a system for configuring installed capacity of a fixed-output light-storage combined power station, aiming at a fixed-output power supply project, according to the power generation requirement of the fixed-output power supply, namely the power generation power and the power generation period, a method for configuring the energy storage capacity of a photovoltaic installation and a battery of the fixed-output light-storage combined power station is provided, firstly, according to historical solar resource conditions of project factories, solar meteorological resources with certain confidence probability are taken as input, and a photovoltaic power generation power curve is calculated and determined by utilizing photovoltaic design software; secondly, calculating and determining the installed power and capacity of the battery energy storage according to the power generation requirement of the fixed output power supply, the photovoltaic power generation power curve and the operation constraint condition of the energy storage system; and finally, simulating the photo-storage combined output according to the determined photovoltaic and energy storage installed capacity, checking whether the specific power generation requirement of the fixed output power supply is met, and the method is small in calculated amount, high in applicability and has guiding significance and practical value for the photovoltaic new energy power generation engineering.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a method and a system for configuring installed capacity of a fixed-output light-storage combined power station.
Background
The solar energy is green clean renewable energy, the solar photovoltaic power station has the characteristics of green environmental protection, short construction period, low requirements on plant sites and the like, and the large-scale construction of the photovoltaic power station at the power supply side is one of the main forms of future clean energy power generation. However, the output of the photovoltaic power station is affected by solar irradiation and meteorological conditions, and the photovoltaic power station has the characteristics of intermittence, volatility and the like, and is low in controllability of photovoltaic output, poor in network source coordination and difficult to be independently used as a main power source. The battery energy storage system is made into an important technical means and implementation mode for improving the output controllability of a photovoltaic power station by means of the flexible charge-discharge characteristic and the rapid response adjustment characteristic of the battery energy storage system and matching with the new photovoltaic energy source for power generation.
In recent years, some fixed output power supply projects are sequentially presented, and the fixed output power supply refers to a power supply project which meets the conditions of the plant address range and the power generation requirement according to the defined plant address range and the power generation requirement (power generation power, power generation period), and does not limit the types of power generation technologies (such as a coal-fired unit, a gas unit, wind power, photovoltaic and the like). The photovoltaic-energy storage combined power station overcomes the defect of uncontrollable photovoltaic output, has the characteristics of environment friendliness, reproducibility, cleanliness, zero pollution, short construction period and the like, does not need fuel supply and no water source requirement, is particularly suitable for being applied to islands, high-altitude areas and remote areas, is a potential technical scheme for fixed output power supply items, and is required to be accurately and reasonably configured due to the fact that the determination of the photovoltaic installed capacity and the energy storage installed power/capacity in the photovoltaic-energy storage combined power station is directly related to the fixed output power supply power generation requirement.
Disclosure of Invention
Aiming at a fixed output power supply project, according to the power generation requirement (power generation power and power generation period) of the fixed output power supply, the invention provides a photovoltaic installation and battery energy storage capacity configuration method for a fixed output light-storage combined power station, which comprises the steps of firstly calculating and determining a photovoltaic power generation power curve by utilizing photovoltaic design software according to historical solar resource conditions of project factories and sites and taking solar meteorological resources with certain confidence probability as input; secondly, calculating and determining the installed power and capacity of the battery energy storage according to the power generation requirement of the fixed output power supply, the photovoltaic power generation power curve and the operation constraint condition of the energy storage system; and finally, simulating the photo-storage combined output according to the determined photovoltaic and energy storage installed capacity, and checking whether the specific power generation requirement of the fixed output power supply is met.
In order to achieve the above purpose, the invention adopts the following technical scheme: the method for configuring the installed capacity of the fixed-output optical storage combined power station comprises the following specific processes:
solar weather resource history data G curve Combining the photovoltaic design scheme and the initial photovoltaic installed capacity P ini Photovoltaic system equipment selection type alternating current/direct current capacity ratio calculation photovoltaic power generation power curve P curve The solar meteorological resource history data G curve Labeling the confidence probability;
for the photovoltaic power generation power curve P curve Checking to obtain the photovoltaic installed capacity P pv ；
Generating power P according to a fixed output power supply require And a continuous power generation period DeltaT require The requirement is that a target generation power curve P is constructed obj For the photovoltaic power generation power curve P curve And the target generated power curve P obj Making a difference to obtain a simulated operation curve P of the energy storage system bess_ini ；
According to the simulated operation curve P of the energy storage system bess_ini Calculating to obtain the stored energy installed power P b And energy storage quasi-installed capacity C b_ini ；
Introducing energy storage operation constraint conditions, and calculating a corrected operation curve P of the energy storage system bess ；
Energy storage system correction operation curve P bess And photovoltaic power generation power curve P curve Adding to obtain a comprehensive operation curve P of the photovoltaic energy storage system hybrid The method comprises the steps of carrying out a first treatment on the surface of the If P hybrid Meet the power generation power P of a fixed output power supply require And the power generation period DeltaT require Required to store energy and install capacity C b Is C b_ini If the requirement is not met, changing the energy storage quasi-installed capacity C b_ini Recalculating the corrected operating curve P of the energy storage system bess Until the requirement is met, the changed energy storage quasi-installed capacity is taken as the final energy storage installed capacity C b 。
Solar meteorological resource history data G curve Comprises a solar irradiation value G, a temperature T and a wind speed V, wherein the solar meteorological resource historical data G curve Each sampling point was acquired once every hour.
The photovoltaic power generation power curve P curve The data point interval of (1) hour/point contains 8760 hours of photovoltaic power generation power data all the year round, the photovoltaic design scheme is string type, centralized or distributed, and the photovoltaic system equipment comprises a photovoltaic module, a photovoltaic inverter, a combiner box, a photovoltaic in-situ boosting transformer, an alternating current/direct current cable and a direct current/alternating current capacity ratio.
For the photovoltaic power generation power curve P curve When the verification is performed, the power P is generated according to the fixed output power supply require And the power generation period DeltaT require The required continuous power generation period deltat is required to be found in 8760 hours of the whole year require Minimum period delta T of mean value of internal photovoltaic output pv Check at DeltaT pv Average value P of photovoltaic power generation power in period of time mean And the required power P require Whether the difference Δp of (a) is equal to [ Δp ] down ，ΔP up ]Power interval, Δp down To consider station power consumption and reserve a power lower limit value of a certain design margin, ΔP up Upper power limit value set to avoid excessive photovoltaic installation, if P mean Meeting the requirement, the photovoltaic installed power P pv Namely P ini The method comprises the steps of carrying out a first treatment on the surface of the If P mean Less than delta P down Reducing initial photovoltaic installed capacity P ini Recalculating to obtain a photovoltaic annual 8760h power generation curve P curve 。
Fixed power generation period delta T require Taking 1 day as one cycle period, 365 cycle periods are taken all year round, and starting from the time a to the time b every day, then:
ΔT i ＝[a i ,b i ]0≤a i ＜b i ≤24，i＝1,2...,365 (1)
ΔT require ＝{ΔT i |i＝1,2...,365} (2)
wherein i represents the ith day; a, a i Represents the ith day, time a; b i Representing time b on day i.
Calculating the energy storage quasi-installed capacity C b_ini At the same time, during several power generation periods DeltaT throughout the year require Within, find the energy storage quasi-operation curve P bess_ini Maximum charging power P corresponding to cmax And maximum discharge power P dmax ，P cmax And P dmax The maximum absolute value is the stored energy installed power P b The method comprises the steps of carrying out a first treatment on the surface of the At several power generation periods DeltaT throughout the year require Within, find the accumulated maximum charge E cmax And maximum discharge E dmax ，E cmax And E is connected with dmax The maximum absolute value is the energy storage quasi-installed capacity C b_ini The method specifically comprises the following steps:
P d ＝{P t |P t ＞0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (6)
P dmax ＝max(P d ) (7)
P c ＝{P t |P t ＜0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (8)
P cmax ＝min(P c ) (9)
P b ＝max(P dmax ,|P cmax |) (10)
C b_ini ＝max(E dmax ,|E cmax |) (13)
p in the formula t Representing the energy storage charging/discharging power at the time t; p (P) d Represents energy storage discharge power; p (P) c Representing stored charge power.
According to the energy storage and charge efficiency eta c Discharge efficiency eta d Upper limit SOC of energy storage charge state up And the lower limit SOC of the energy storage charge state down Quasi-operation curve P of energy storage system bess_ini Stored energy power P b And energy storage quasi-installed capacity C b_ini For input, calculating a annual 8760h energy storage system corrected operating curve P taking into account energy storage operating constraints bess ，P bess The calculation method of each energy storage operation power value in the curve is original P bess_ini The corresponding charge/discharge power value is corrected to replace the original P bess_ini The numerical value, correction calculation formula is as follows:
SOC down ≤SOC t ≤SOC up ,t∈[a i ,b i ]i=1, 2,..365 (formula 14)
P in the formula dr Representing the energy storage correction discharge power; p (P) cr Representing the stored energy corrected charge power.
A fixed output light-storage combined power station installed capacity configuration system comprises a photovoltaic power generation power curve P curve Module, photovoltaic installed capacity P pv Calculation module and energy storage system simulated operation curve P bess_ini Calculation module, energy storage quasi-installed capacity C b_ini Calculation module and energy storage system correction operation curve P bess The computing module and the checking module;
photovoltaic power generation power curve P curve Module is based on solar weather resource historical data G curve Combining the photovoltaic design scheme and the initial photovoltaic installed capacity P ini Photovoltaic system equipment selection type alternating current/direct current capacity ratio calculation photovoltaic power generation power curve P curve ；
Photovoltaic installed capacity P pv The calculation module is used for calculating the photovoltaic power generation power curve P curve Checking to obtain the photovoltaic installed capacity P pv ；
Energy storage system simulated operation curve P bess_ini The calculation module is used for generating power P according to the fixed output power supply require And a continuous power generation period DeltaT require The requirement is that a target generation power curve P is constructed obj For the photovoltaic power generation power curve P curve And the target generated power curve P obj Making a difference to obtain a simulated operation curve P of the energy storage system bess_ini ；
Energy storage quasi-installed capacity C b_ini The calculation module is used for calculating a simulated operation curve P according to the energy storage system bess_ini Calculating to obtain the stored energy installed power P b And energy storage quasi-installed capacity C b_ini ；
Energy storage system correction operation curve P bess The calculation module is used for introducing energy storage operation constraint conditions and calculating a corrected operation curve P of the energy storage system bess ；
The verification module is used for verifying the corrected operation curve P of the energy storage system bess Obtaining the final energy storage quasi-installed capacity C b_ini Specific: energy storage system correction operation curve P bess And photovoltaic power generation power curve P curve Adding to obtain a comprehensive operation curve P of the photovoltaic energy storage system hybrid The method comprises the steps of carrying out a first treatment on the surface of the If P hybrid Meet the power generation power P of a fixed output power supply require And the power generation period DeltaT require Required to store energy and install capacity C b Is C b_ini If the requirement is not met, changing the energy storage quasi-installed capacity C b_ini Recalculating the corrected operating curve P of the energy storage system bess Until the requirement is met, the modified energy storage quasi-installed capacity is taken asFinal energy storage capacity C b 。
The invention also provides a computer device, which comprises a processor and a memory, wherein the memory is used for storing computer executable programs, the processor reads part or all of the computer executable programs from the memory and executes the computer executable programs, and the fixed-output optical storage combined power station capacity configuration method can be realized when the processor executes part or all of the computer executable programs.
The invention provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the method for configuring the installed capacity of the fixed-output optical storage combined power station can be realized.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the method, firstly, according to historical solar resource conditions of a project site, solar meteorological resources with certain confidence probability are used as input, and a photovoltaic power generation power curve is calculated and determined; and then, by comprehensively considering the power generation requirement of the fixed output power supply and the operation constraint condition of the energy storage system, the installed power of the photovoltaic installation, the installed power and the capacity of the battery energy storage are calculated and determined, the calculated amount is small, the applicability is strong, the method has guiding significance and practical value for the new photovoltaic energy power generation engineering, the installed capacity of the photovoltaic installation, the installed power and the capacity of the battery energy storage can be calculated and configured according to the specific power generation requirement of the fixed output power supply, and at least two important application scenes are as follows: firstly, a power project requiring a green clean power generation technology is adopted; secondly, the invention is especially suitable for application in islands, high altitude areas and remote areas due to the power supply project limited by sites, water sources and fuel supply.
Drawings
Fig. 1 is a flow chart of calculation of energy storage capacity of a photovoltaic installation and a battery of an optical storage combined power station.
FIG. 2 is a historical data of solar irradiation resources at a project site.
FIG. 3 is a photovoltaic annual 8760h power generation curve P curve 。
FIG. 4 is a schematic diagram of an energy storage systemOperating curve P bess ；
FIG. 5a is a schematic diagram of a continuous 15-day light and storage combined output curve in winter in a certain project;
FIG. 5b is a schematic diagram of a continuous 15-day light and storage combined output curve in summer for a project.
Detailed Description
The present invention is described in further detail below:
1) Collecting historical data of solar meteorological resources of project plant site
Collecting solar irradiation resource historical data G of the project plant site from a local weather station or a network weather database of the project plant site curve The data point sampling interval is 1 hour/point and should contain 8760 hours of solar irradiance data throughout the year. The data items include solar irradiation values G (unit W/m 2 ) Temperature T (in ℃), wind speed V (in m/s). Because the illumination resources have certain randomness, the historical solar irradiation data cannot represent the future solar irradiation level, so the obtained solar irradiation resource historical data G curve The confidence probability should be indicated as P90, which means that the solar irradiation level reaches G throughout the year curve The confidence probability of the solar energy power generation system is 90%, and the calculation process is that solar irradiation resource historical data of P90 is adopted, namely the probability that the configured photovoltaic installation and the energy storage capacity meet the power generation requirement of a fixed power supply is 90%.
2) Calculating a photovoltaic annual 8760h power generation curve P under a selected photovoltaic design scheme curve
Obtaining solar meteorological resource historical data G by the step 1) curve For meteorological input, photovoltaic power generation power curve P is calculated and obtained by using photovoltaic design software (such as PVsyst) curve ，P curve The data point interval is 1 hour/point and should contain 8760 hours of photovoltaic power generation data throughout the year. The method comprises the following steps: according to selected photovoltaic design scheme (group string, centralized, distributed), initial photovoltaic installed capacity P ini The photovoltaic system main equipment comprises a photovoltaic module, a photovoltaic inverter, a combiner box, a photovoltaic in-situ boosting, a AC/DC cable, a DC/AC capacitance ratio and the like, and is prepared by solar energy weatherResource annual 8760h history curve G curve As input, according to the initial photovoltaic installation capacity P ini Calculating to obtain a photovoltaic annual 8760h power generation curve P under a selected photovoltaic design scheme curve . At the initial calculation, an initial photovoltaic installed capacity P ini Can generate power P according to a fixed output power supply require Twice as much as considered.
3) Determining a photovoltaic installation P under a selected photovoltaic design pv
8760h generation curve P of the photovoltaic full year obtained in the step 2) curve Checking, and generating power P according to the fixed output power supply require And the power generation period DeltaT require The required continuous power generation period deltat is required to be found in 8760 hours of the whole year require Minimum period delta T of mean value of internal photovoltaic output pv Check at DeltaT pv Average value P of photovoltaic power generation power in period of time mean And the required power P require Whether the difference Δp of (a) is equal to [ Δp ] d o wn ，ΔP up ]A power interval. ΔP d o wn To consider station power consumption and reserve a power lower limit value of a certain design margin, ΔP up Upper power limit value Δp set to avoid excessive photovoltaic installation d o wn And delta P up Should be set as appropriate according to the station specific situation. If P mean Meeting the requirement, the photovoltaic installed power P pv Namely P ini Step 4) is entered; if P mean Less than delta P down Returning to step 2), the initial photovoltaic installed capacity P is appropriately increased ini Recalculating to obtain a photovoltaic annual 8760h power generation curve P curve The method comprises the steps of carrying out a first treatment on the surface of the If P mean Greater than delta P up Returning to step 2), the initial photovoltaic installed capacity P is suitably reduced ini Recalculating to obtain a photovoltaic annual 8760h power generation curve P curve . The specific calculation formula is expressed as follows:
let the fixed power supply generate time period delta T require With 1 day as one cycle period, 365 (or 364) cycles are taken all the year round, and each day starts from the time a to the time b, and then:
ΔT i ＝[a i ,b i ]0≤a i ＜b i not more than 24, i=1, 2.,
AT require = { AT; i=1, 2..365 } (formula 2)
Wherein i represents the ith day; a, a i Represents the ith day, time a; b i Represents the ith day, time b;
4) Calculating a simulated operation curve P of the 8760h energy storage system all the year round bess_ini
Generating power P according to a fixed output power supply require And the power generation period DeltaT require The requirement is that a target generating power curve P of 8760h in the whole year is constructed obj The method specifically comprises the following steps: at the required power generation period DeltaT require Within, a target generated power curve P obj The power generation value is the power generation P of the fixed output power supply require The method comprises the steps of carrying out a first treatment on the surface of the At the required power generation period DeltaT require In addition, a target generated power curve P obj The power generation value is 0; according to the fixed output power supply requirement, P require May be a certain fixed output power value, may also be equal to the power generation period DeltaT require An associated variable output power sequence. The constructed target generated power curve P obj The 8760 hours of the whole year should be included, representing 8760 hours of the whole year target generated power, with data point intervals of 1 hour/point. For the constructed target generation power curve P obj And step 2) obtaining a photovoltaic annual 8760h power generation curve P curve Making difference to obtain a simulated operation curve P of the 8760h energy storage system in the whole year bess_ini 。P bess_ini The middle value is positive for energy storage discharge and the negative for energy storage charge.
P bess_ini ＝P obj -P curve (5)
5) Calculating and storing machinePower P b And energy storage quasi-installed capacity C b_ini
The simulated operation curve P of the annual 8760h energy storage system obtained in the step 4) is calculated bess_ini Analyzing to obtain the stored energy installed power P b And energy storage quasi-installed capacity C b_ini . The method comprises the following steps: at several power generation periods DeltaT throughout the year require Within, find the energy storage quasi-operation curve P bess_ini Maximum charging power P corresponding to cmax And maximum discharge power P dmax ，P cmax And P dmax The maximum absolute value is the stored energy installed power P b The method comprises the steps of carrying out a first treatment on the surface of the At several power generation periods DeltaT throughout the year require Within, find the accumulated maximum charge E cmax And maximum discharge E dmax ，E cmax And E is connected with dmax The maximum absolute value is the energy storage quasi-installed capacity C b_ini 。
P d ＝{P t |P t ＞0，P t ∈P bess_ini },t∈[a i ,b i ]I=1, 2,..365 (formula 6)
P dmax ＝max(P d ) (7)
P c ＝{P t |P t ＜0，P t ∈P bess_ini },t∈[a i ,b i ]I=1, 2,..365 (formula 8)
P cmax ＝min(P c ) (9)
P b ＝max(P dmax ,|P cmax |) (10)
C b_ini ＝max(E dmax ,|E cmax |) (expression 13)
P in the formula t Representing the energy storage charging/discharging power at the time t; p (P) d Represents energy storage discharge power; p (P) c Representing stored charge power;
6) Considering energy storage operation constraint, calculating a annual 8760h energy storage system correction operation curve P bess
According to the energy storage and charge efficiency eta c Discharge efficiency eta d Upper limit SOC of energy storage charge state up And the lower limit SOC of the energy storage charge state down The annual 8760h energy storage system simulated operation curve P obtained in the step 4) is adopted bess_ini With the stored energy installed power P obtained in the step 5) b And energy storage quasi-installed capacity C b_ini For input, calculating a annual 8760h energy storage system corrected operating curve P taking into account energy storage operating constraints bess 。P bess The calculation method of each energy storage operation power value in the curve is original P bess_ini The corresponding charge/discharge power value is corrected to replace the original P bess_ini The numerical value, correction calculation formula is as follows:
SOC down ≤SOC t ≤SOC up ,t∈[a i ,b i ]i=1, 2,..365 (formula 14)
P in the formula dr Representing the energy storage correction discharge power; p (P) cr Representing the energy storage correction charging power;
7) Determining the stored energy loading capacity C b
Correcting the operating curve P of the annual 8760h energy storage system obtained in the step 6) bess And the photovoltaic annual 8760h power generation curve P obtained in the step 2) curve Adding to obtain a comprehensive operation curve P of the photovoltaic energy storage system 8760h in the whole year hybrid Check P hybrid The required power generation period DeltaT of 8760h throughout the year require Whether or not the internal force meets the fixed forceSource power P require If the energy storage capacity is not satisfied, returning to the step 6), and properly increasing the energy storage quasi-installed capacity C b_ini And re-calculating the comprehensive operation curve P of the annual 8760h energy storage system bess The method comprises the steps of carrying out a first treatment on the surface of the If the requirement is met, the energy storage capacity C b Namely C b_ini 。
P hybrid ＝P curve +P bess (17)
In summary, according to the above calculation steps, the photovoltaic installation P is finally obtained pv Stored energy power P b The installed capacity with the stored energy is C b . The flow chart of the calculation process is shown in fig. 1.
The invention is further illustrated by the following examples:
taking a fixed output power supply project in a certain area as an example, the power generation requirements of the fixed output power supply are as follows: the project alternating current grid connection point is provided with a 50MW generating power guarantee value, the generating period is 06:00 to 23:00 per day, and the generating duration is 17 hours per day. The photovoltaic and electric energy storage technology is adopted as a fixed output power supply technical scheme. The selected photovoltaic design scheme is as follows: double-sided photovoltaic module + string inverter + single-axis tracking formula support scheme, direct current/alternating current appearance ratio = 1.2.
1) Collecting historical data of solar meteorological resources of project plant site
Historical solar irradiation resource data Gcurve of project site is collected through a meteorological database, and the sampling interval of data points is 1 hour/point, and the data points comprise solar irradiation data of 8760 hours all the year round. Wherein the solar irradiation value 8760h curve is shown in figure 2. From fig. 2, it can be preliminarily determined that the period 3300h to 4700h is the period of minimum annual photovoltaic power generation power.
2) Calculating a photovoltaic annual 8760h power generation curve P under a selected photovoltaic design scheme curve
3) Determining a photovoltaic installation P under a selected photovoltaic design pv
Obtaining solar meteorological resource historical data G by the step 1) curve For input, photovoltaic power generation power curve P is calculated and obtained by using photovoltaic design software (PVsyst) curve . Photovoltaic installed capacity P ini After the cyclic adjustment of step 2) and step 3), it was determined to be 203.2MW. FIG. 3 is a annual 8760h power generation curve P curve . The ΔP is taken into account in the calculation down ＝2MW，ΔP up ＝4MW。
4) Calculating a simulated operation curve P of the 8760h energy storage system all the year round bess_ini
Constructing a target power generation power curve P of 8760h in the whole year according to the annual power generation period requirement of a fixed output power supply project obj Wherein the corresponding target power generation value is 50MW when 06:00 to 23:00 are carried out every day, and the target power generation value is set to be 0MW in the rest period; for the constructed target generation power curve P obj 8760h generation curve P with photovoltaic whole year curve Making difference to obtain a simulated operation curve P of the 8760h energy storage system in the whole year bess_ini . FIG. 4 is a simulated operating curve P of the energy storage system at the time interval 3300h-4700h bess_ini 。P bess_ini The middle value is positive for energy storage discharge and the negative for energy storage charge.
5) Calculating the stored energy installed power P b And energy storage quasi-installed capacity C b_ini
The simulated operation curve P of the annual 8760h energy storage system obtained in the step 4) is calculated bess_ini Analyzing, calculating according to the formula (6) -formula (13) to obtain the stored energy installed power P b =100 MW, energy storage quasi-installed capacity C b_ini ＝541MWh。
6) Considering energy storage operation constraint, calculating a annual 8760h energy storage system correction operation curve P bess
7) Determining the stored energy loading capacity C b
Set the energy storage and charge efficiency eta c =0.92, discharge efficiency η d =0.92, upper limit SOC of stored state of charge up =95% of the energy storage state of charge lower limit SOC down =10% and a year-round 8760h energy storage system correction operation curve P was obtained bess . Calculating according to the formula (14) -formula (16) to obtain the energy storage loading capacity C b =602 MWh. Fig. 5a and fig. 5b are respectively light-storage combined output curves of 15 days in winter and summer, and it can be seen from the graph that the light-storage combined system configured according to the method can meet the power generation requirement of a fixed output power supply.
According to the embodiment, the patent provides a photovoltaic installation and battery energy storage capacity configuration method for a fixed-output light-storage combined power station aiming at a fixed-output power supply project. According to the method, firstly, solar meteorological resources with certain confidence probability are used as input according to historical solar resource conditions of project sites, and a photovoltaic power generation power curve is calculated and determined by utilizing photovoltaic design software; and then, calculating and determining the installed power of the photovoltaic device and the installed power and capacity of the battery energy storage device by comprehensively considering the power generation requirement of the fixed output power supply and the operation constraint condition of the energy storage system. The method has the advantages of small calculated amount and strong applicability, and has guiding significance and practical value for the photovoltaic new energy power generation engineering.
The invention also provides a computer device, which comprises a processor and a memory, wherein the memory is used for storing computer executable programs, the processor reads part or all of the computer executable programs from the memory and executes the computer executable programs, and the fixed-output optical storage combined power station capacity configuration method can be realized when the processor executes part or all of the computer executable programs.
In another aspect, the present invention provides a computer readable storage medium, where a computer program is stored, where the computer program, when executed by a processor, can implement the method for configuring installed capacity of a fixed output optical storage combined power station according to the present invention.
The computer device may be an in-vehicle computer, a notebook computer, a tablet computer, a desktop computer, a cell phone, or a workstation.
The processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or an off-the-shelf programmable gate array (FPGA).
The memory can be an internal memory unit of a vehicle-mounted computer, a notebook computer, a tablet computer, a desktop computer, a mobile phone or a workstation, such as a memory and a hard disk; external storage units such as removable hard disks, flash memory cards may also be used.
Computer readable storage media may include computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. The computer readable storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), solid state disk (SSD, solid State Drives), or optical disk, etc. The random access memory may include resistive random access memory (ReRAM, resistance Random Access Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others.
According to the method, firstly, solar meteorological resources with certain confidence probability are used as input according to historical solar resource conditions of project sites, and a photovoltaic power generation power curve is calculated and determined by utilizing photovoltaic design software; and then, the photovoltaic installed power, the battery energy storage installed power and the capacity are calculated and determined by comprehensively considering the fixed output power supply power generation requirement and the operation constraint condition of the energy storage system, so that the method has small calculated amount and strong applicability and has guiding significance and practical value for the photovoltaic new energy power generation engineering.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. The method for configuring the installed capacity of the fixed-output light-storage combined power station is characterized by comprising the following specific processes:
solar weather resource history data G curve Combining the photovoltaic design scheme and the initial photovoltaic installed capacity P ini Photovoltaic system equipment selection type alternating current/direct current capacity ratio calculation photovoltaic power generation power curve P curve The solar meteorological resource history data G curve Labeling the confidence probability;
to the instituteThe photovoltaic power generation power curve P curve Checking to obtain the photovoltaic installed capacity P pv ；
Generating power P according to a fixed output power supply require And a continuous power generation period DeltaT require The requirement is that a target generation power curve P is constructed obj For the photovoltaic power generation power curve P curve And the target generated power curve P obj Making a difference to obtain a simulated operation curve P of the energy storage system bess_ini ；
According to the simulated operation curve P of the energy storage system bess_ini Calculating to obtain the stored energy installed power P b And energy storage quasi-installed capacity C b_ini ；
Introducing energy storage operation constraint conditions, and calculating a corrected operation curve P of the energy storage system bess ；
Energy storage system correction operation curve P bess And photovoltaic power generation power curve P curve Adding to obtain a comprehensive operation curve P of the photovoltaic energy storage system hybrid The method comprises the steps of carrying out a first treatment on the surface of the If P hybrid Meet the power generation power P of a fixed output power supply require And the power generation period DeltaT require Required to store energy and install capacity C b Is C b_ini If the requirement is not met, changing the energy storage quasi-installed capacity C b_ini Recalculating the corrected operating curve P of the energy storage system bess Until the requirement is met, the changed energy storage quasi-installed capacity is taken as the final energy storage installed capacity C b ；
For the photovoltaic power generation power curve P curve When the verification is performed, the power P is generated according to the fixed output power supply require And the power generation period DeltaT require The required continuous power generation period deltat is required to be found in 8760 hours of the whole year require Minimum period delta T of mean value of internal photovoltaic output pv Check at DeltaT pv Average value P of photovoltaic power generation power in period of time mean And the required power P require Whether the difference Δp of (a) is equal to [ Δp ] down ，ΔP up ]Power interval, Δp down To consider station power consumption and reserve a power lower limit value of a certain design margin, ΔP up Power set to avoid excessive photovoltaic installationUpper limit value, if P mean Meeting the requirement, the photovoltaic installed power P pv Namely P ini The method comprises the steps of carrying out a first treatment on the surface of the If P mean Less than delta P down Reducing initial photovoltaic installed capacity P ini Recalculating to obtain a photovoltaic annual 8760h power generation curve P curve ；
Fixed power generation period delta T require Taking 1 day as one cycle period, 365 cycle periods are taken all year round, and starting from the time a to the time b every day, then:
ΔT i ＝[a i ,b i ] 0≤a i ＜b i ≤24，i＝1,2...,365 (1)
ΔT require ＝{ΔT i |i＝1,2...,365} (2)
wherein i represents the ith day; a, a i Represents the ith day, time a; b i Represents the ith day, time b;
calculating the energy storage quasi-installed capacity C b_ini At the same time, during several power generation periods DeltaT throughout the year require Within, find the energy storage quasi-operation curve P bess_ini Maximum charging power P corresponding to cmax And maximum discharge power P dmax ，P cmax And P dmax The maximum absolute value is the stored energy installed power P b The method comprises the steps of carrying out a first treatment on the surface of the At several power generation periods DeltaT throughout the year require Within, find the accumulated maximum charge E cmax And maximum discharge E dmax ，E cmax And E is connected with dmax The maximum absolute value is the energy storage quasi-installed capacity C bini The method specifically comprises the following steps:
P d ＝{P t |P t ＞0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (6)
P dmax ＝max(P d ) (7)
P c ＝{P t |P t ＜0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (8)
P cmax ＝min(P c ) (9)
P b ＝max(P dmax ,|P cmax |) (10)
C b_ini ＝max(E dmax ,|E cmax |) (13)
p in the formula t Representing the energy storage charging/discharging power at the time t; p (P) d Represents energy storage discharge power; p (P) c Representing stored charge power;
with energy storage and charging efficiency eta c Discharge efficiency eta d Upper limit SOC of energy storage charge state up And the lower limit SOC of the energy storage charge state down Quasi-operation curve P of energy storage system bess_ini Stored energy power P b And energy storage quasi-installed capacity C b_ini For input, calculating a annual 8760h energy storage system corrected operating curve P taking into account energy storage operating constraints bess ，P bess The calculation method of each energy storage operation power value in the curve is original P bess_ini The corresponding charge/discharge power value is corrected to replace the original P bess_ini The numerical value, correction calculation formula is as follows:
SOC down ≤SOC t ≤SOC up ,t∈[a i ,b i ]i=1, 2,..365 (formula 14)
P in the formula dr Representing the energy storage correction discharge power; p (P) cr Representing the stored energy corrected charge power.
2. The method for configuring the installed capacity of a fixed-output light-storage combined power station according to claim 1, wherein solar meteorological resource history data G curve Comprises a solar irradiation value G, a temperature T and a wind speed V, wherein the solar meteorological resource historical data G curve Each sampling point was acquired once every hour.
3. The method for configuring the installed capacity of a fixed-output light-storage combined power station according to claim 1, wherein the photovoltaic power generation power curve P curve The data point interval of (1) hour/point contains 8760 hours of photovoltaic power generation power data all the year round, the photovoltaic design scheme is string type, centralized or distributed, and the photovoltaic system equipment comprises a photovoltaic module, a photovoltaic inverter, a combiner box, a photovoltaic in-situ boosting transformer, an alternating current/direct current cable and a direct current/alternating current capacity ratio.
4. The installed capacity configuration system of the fixed-output light-storage combined power station is characterized by comprising a photovoltaic power generation power curve P curve Module, photovoltaic installed capacity P pv Calculation module and energy storage system simulated operation curve P bess_ini Calculation module, energy storage quasi-installed capacity C b_ini Calculation module and energy storage system correction operation curve P bess The computing module and the checking module;
photovoltaic power generation power curve P curve Module is based on solar weather resource historical data G curve Combining the photovoltaic design scheme and the initial photovoltaic installed capacity P ini Photovoltaic system equipment selectionCalculating photovoltaic power generation power curve P by alternating current/direct current capacity ratio curve The method comprises the steps of carrying out a first treatment on the surface of the For the photovoltaic power generation power curve P curve When the verification is performed, the power P is generated according to the fixed output power supply require And the power generation period DeltaT require The required continuous power generation period deltat is required to be found in 8760 hours of the whole year require Minimum period delta T of mean value of internal photovoltaic output pv Check at DeltaT pv Average value P of photovoltaic power generation power in period of time mean And the required power P require Whether the difference Δp of (a) is equal to [ Δp ] down ，ΔP up ]Power interval, Δp down To consider station power consumption and reserve a power lower limit value of a certain design margin, ΔP up Upper power limit value set to avoid excessive photovoltaic installation, if P mean Meeting the requirement, the photovoltaic installed power P pv Namely P ini The method comprises the steps of carrying out a first treatment on the surface of the If P mean Less than delta P down Reducing initial photovoltaic installed capacity P ini Recalculating to obtain a photovoltaic annual 8760h power generation curve P curve ；
Fixed power generation period delta T require Taking 1 day as one cycle period, 365 cycle periods are taken all year round, and starting from the time a to the time b every day, then:
ΔT i ＝[a i ,b i ] 0≤a i ＜b i ≤24，i＝1,2...,365 (1)
ΔT require ＝{ΔT i |i＝1,2...,365} (2)
wherein i represents the ith day; a, a i Represents the ith day, time a; b i Represents the ith day, time b;
photovoltaic installationCapacity P pv The calculation module is used for calculating the photovoltaic power generation power curve P curve Checking to obtain the photovoltaic installed capacity P pv ；
Energy storage system simulated operation curve P bess_ini The calculation module is used for generating power P according to the fixed output power supply require And a continuous power generation period DeltaT require The requirement is that a target generation power curve P is constructed obj For the photovoltaic power generation power curve P curve And the target generated power curve P obj Making a difference to obtain a simulated operation curve P of the energy storage system bess_ini ；
Energy storage quasi-installed capacity C b_ini The calculation module is used for calculating a simulated operation curve P according to the energy storage system bess_ini Calculating to obtain the stored energy installed power P b And energy storage quasi-installed capacity C b_ini The method comprises the steps of carrying out a first treatment on the surface of the Calculating the energy storage quasi-installed capacity C b_ini At the same time, during several power generation periods DeltaT throughout the year require Within, find the energy storage quasi-operation curve P bess_ini Maximum charging power P corresponding to cmax And maximum discharge power P dmax ，P cmax And P dmax The maximum absolute value is the stored energy installed power P b The method comprises the steps of carrying out a first treatment on the surface of the At several power generation periods DeltaT throughout the year require Within, find the accumulated maximum charge E cmax And maximum discharge E dmax ，E cmax And E is connected with dmax The maximum absolute value is the energy storage quasi-installed capacity C b_ini The method specifically comprises the following steps:
P d ＝{P t |P t ＞0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (6)
P dmax ＝max(P d ) (7)
P c ＝{P t |P t ＜0，P t ∈P bess_ini },t∈[a i ,b i ]，i＝1,2,...，365 (8)
P cmax ＝min(P c ) (9)
P b ＝max(P dmax ,|P cmax |) (10)
C b_ini ＝max(E dmax ,|E cmax |) (13)
p in the formula t Representing the energy storage charging/discharging power at the time t; p (P) d Represents energy storage discharge power; p (P) c Representing stored charge power;
energy storage system correction operation curve P bess The calculation module is used for introducing energy storage operation constraint conditions and calculating a corrected operation curve P of the energy storage system bess ；
The verification module is used for verifying the corrected operation curve P of the energy storage system bess Obtaining the final energy storage quasi-installed capacity C b_ini Specific: energy storage system correction operation curve P bess And photovoltaic power generation power curve P curve Adding to obtain a comprehensive operation curve P of the photovoltaic energy storage system hybrid The method comprises the steps of carrying out a first treatment on the surface of the If P hybrid Meet the power generation power P of a fixed output power supply require And the power generation period DeltaT require Required to store energy and install capacity C b Is C b_ini If the requirement is not met, changing the energy storage quasi-installed capacity C b_ini Recalculating the corrected operating curve P of the energy storage system bess Until the requirement is met, the changed energy storage quasi-installed capacity is taken as the final energy storage installed capacity C b The method comprises the steps of carrying out a first treatment on the surface of the With energy storage and charging efficiency eta c Discharge efficiency eta d Upper limit SOC of energy storage charge state up And the lower limit SOC of the energy storage charge state down Quasi-operation curve P of energy storage system bess_ini Stored energy power P b And energy storage quasi-installed capacity C b_ini For input, calculating a annual 8760h energy storage system corrected operating curve P taking into account energy storage operating constraints bess ，P bess The calculation method of each energy storage operation power value in the curve is original P bess_ini The corresponding charge/discharge power value is corrected to replace the original P bess_ini The numerical value, correction calculation formula is as follows:
SOC down ≤SOC t ≤SOC up ,t∈[a i ,b i ]i=1, 2,..365 (formula 14)
P in the formula dr Representing the energy storage correction discharge power; p (P) cr Representing the stored energy corrected charge power.
5. A computer device, characterized by comprising a processor and a memory, wherein the memory is used for storing a computer executable program, the processor reads part or all of the computer executable program from the memory and executes the computer executable program, and the processor can realize the fixed output optical storage combined power station installed capacity configuration method according to any one of claims 1 to 3 when executing part or all of the computer executable program.
6. A computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the computer program can implement the method for configuring the installed capacity of the fixed-output optical storage combined power station according to any one of claims 1 to 3.
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