CN113541171B - Control method and system for unified scheduling of large-scale energy storage power stations - Google Patents
Control method and system for unified scheduling of large-scale energy storage power stations 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
- H02J3/28—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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/48—Controlling the sharing of the in-phase component
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a control method and a system for unified scheduling of a large-scale energy storage power station, wherein the method comprises the steps of firstly determining the reserved reactive power of the energy storage power station for transient voltage support; then according to the capacity of the power converter and the capacity of the battery, sequentially determining a reactive power adjusting range for voltage regulation, an active power adjusting range and the capacity of the battery for frequency modulation, and an active power adjusting range and the capacity of the battery for peak regulation; and finally, respectively calculating and generating an active power dispatching control instruction and a reactive power dispatching control instruction of each energy storage power station at the current moment according to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, and issuing each energy storage power station to execute. The invention realizes the unified scheduling control of the energy storage power station, effectively coordinates the active and reactive power output of the energy storage power station, meets the requirements of the power grid on various application scenes of the energy storage power station, such as transient voltage support, peak regulation, frequency modulation, voltage regulation and the like, effectively improves the stability of the power grid and effectively improves the utilization efficiency of the energy storage power station.
Description
Technical Field
The invention relates to power system scheduling, in particular to a control method and a control system for unified scheduling of large-scale energy storage power stations.
Background
With the development of energy storage technology, large-scale energy storage power stations are connected to the grid, and the energy storage capacity in the power grid is greatly improved. The energy storage power station has the capability of simultaneously regulating and controlling active power and reactive power, has the advantages of high regulation and control speed, small equipment damage, no need of wind and water abandonment, light abandonment and the like in the active regulation and control aspect, and has the advantages of distributed point dispersion, convenience in reactive power local balance and the like in the reactive power regulation and control aspect. Energy storage power stations are becoming the main members participating in the operation, scheduling and control of the power grid. With the proposition of the targets of carbon peak reaching and carbon neutralization, the proportion of thermal power stations is gradually reduced, the proportion of new energy power stations is gradually increased, and the function of energy storage power stations in power grid operation scheduling control is increasingly remarkable. The operation scheduling control of the power grid containing the energy storage power station becomes an important ring of a novel power system.
The energy storage power station participating in the power grid operation scheduling control can be used for various application scenes such as transient voltage support, peak regulation, frequency modulation and voltage regulation, and the energy storage power station needs to be subjected to unified scheduling control so as to coordinate active and reactive power output of the energy storage power station and meet application requirements of various scenes. But a unified power dispatching control method and system for an energy storage power station aiming at multi-scenario application are lacked at present. The existing energy storage power station has a single application scene, is only used for power grid peak shaving, only works for 8 hours (two charging and two discharging) every day, is in an idle state for 16 hours every day, has high equipment idle rate and has limited effect on power grid operation.
Therefore, a unified scheduling control method and a system for a large-scale energy storage power station are needed to meet the requirements of the energy storage power station for participating in various application scenarios such as power grid transient voltage support, peak regulation, frequency modulation and voltage regulation, and improve the support effect of an energy storage technology on power grid operation. The existing methods related to power control of energy storage power stations are not few, but basically no reactive power unified control method which meets the requirements of multiple application scenes is involved. For example, chinese patent document No. 201110459445.2 discloses a battery energy storage power station power control method and system for frequency modulation, which support the energy storage power station to participate in the function of frequency modulation of the power grid, but do not relate to other scene requirements such as participation in transient voltage support, peak regulation, voltage regulation, and the like; the Chinese patent document with the application number of 201310260143.1 discloses a reactive power distribution and control method for a battery energy storage power station, which optimizes the reactive power distribution of each energy storage converter in the energy storage power station, but does not relate to the unified scheduling control of the energy storage power station participating in a multi-application scene of a power grid.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a control method and a system for unified scheduling of a large-scale energy storage power station, and aims to fully consider the requirements of the energy storage power station in multiple application scenes and realize the maximum utilization of energy storage resources to the operation control of a power grid.
In order to solve the technical problems, the invention adopts the technical scheme that:
a control method for unified scheduling of a large-scale energy storage power station comprises the following steps of effectively coordinating active power output of the energy storage power station for unified scheduling control of the energy storage power station:
1) Determining the active power regulation range [ P ] of the ith energy storage power station imin ,P imax ]；
2) According to the active regulation range [ P imin ,P imax ]And the power grid demand and the battery electric quantity of the energy storage power station, and determining the active power regulation range [ P ] of the ith energy storage power station for frequency modulation ipmin ,P ipmax ]Battery capacity E ip And ith active power regulation range [ P ] for peak regulation ifmin ,P ifmax ]Battery capacity E if ；
3) According to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, the active power regulation range [ P ] for frequency modulation is determined ipmin ,P ipmax ]And active power regulation range [ P ] for peak shaving ifmin ,P ifmax ]Battery capacity E if Respectively calculating the active power P for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if ；
4) The active power P used for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if Summing to generate an active power scheduling control instruction P of the ith energy storage power station at the current moment i ；
5) Scheduling control instruction P of active power i And issuing the ith energy storage power station to execute according to the preset active power regulation frequency.
Optionally, determining the active power regulation range [ P ] of any ith energy storage power station in the step 1) imin ,P imax ]The functional expression of (a) is:
in the above formula, P im Rated active power, Q, for the ith energy storage station iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power, S, for the ith energy-storage power station im The total capacity of the power converter PCS of the ith energy storage power station.
Optionally, the step 2) is based on the active power regulation range [ P imin ,P imax ]And the power grid demand and the battery capacity of the energy storage power station, and determining the active power regulation range [ P ] for frequency modulation of the ith energy storage power station ipmin ,P ipmax ]Battery capacity E ip And the ith seat is used for the active power regulation range [ P ] of peak regulation ifmin ,P ifmax ]Battery capacity E if Then, the ith energy storage power station is used for the active power regulation range [ P ] of frequency modulation ipmin ,P ipmax ]Battery capacity E ip And ith active power regulation range [ P ] for peak regulation ifmin ,P ifmax ]Battery capacity E if The following constraints are satisfied:
in the above formula, E im For the i-th energy storage station battery capacity, T ip And presetting a frequency modulation period for the ith energy storage power station.
Optionally, the active power P for frequency modulation of the ith energy storage power station at the current moment is calculated in step 3) ip Comprises the following steps: taking the energy storage power station as a priority regulation object to participate in AGC system control, and according to the current electric quantity E of the ith energy storage power station i Correcting the active power regulation range [ P ] for frequency modulation based on' ipmin ,P′ ipmax ]And then according to the corrected active power regulation range [ P 'for frequency modulation' ipmin ,P′ ipmax ]Calculating to obtain the active power P for frequency modulation of the ith energy storage power station at the current moment by using the conventional AGC system calculation method ip ；
In the above formula, E imin 、E imax The maximum electric quantity and the minimum electric quantity of the battery of the ith energy storage power station are respectively.
Optionally, the active power P for peak shaving of the ith energy storage power station at the current moment is calculated in the step 3) if Comprises the following steps: the ith energy storage power station participates in power grid peak regulation according to a daily load curve and the battery capacity E if Determining the charging and discharging time period and duration of the ith energy storage power station, and adjusting the range [ P ] based on the determined active power for peak shaving ifmin ,P ifmax ]According to a charging period P if ＝P ifmin Discharge period P if ＝P ifmax Calculating to obtain the active power P for peak shaving of the ith energy storage power station at the current moment if 。
Optionally, the method further comprises the step of effectively coordinating the reactive power output of the energy storage power station through unified scheduling control of the energy storage power station:
s1) determining reserved reactive power Q for transient voltage support of any ith energy storage power station iz ；
S2) based on reserved reactive power Q iz Determining reactive power regulation range [ Q ] of ith seat for regulating voltage iymin ,Q iymax ]；
S3) adjusting the range [ Q ] based on the reactive power iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy ；
S4) reactive power Q based on voltage regulation iy Generating the ith reactive power scheduling control instruction Q at the current moment i And sending the ith energy storage power station to execute the operation according to the preset reactive power regulation frequency;
optionally, determining the reactive power regulation range [ Q ] of the ith seat for regulating voltage in step S2) iymin ,Q iymax ]The functional expression of (a) is:
Q iymin ＝-Q im
in the above formula, Q iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power of the ith energy storage power station and rated reactive power Q of the ith energy storage power station im The formula of the calculation function is:
in the above formula, S im Total capacity, P, of power converter PCS of ith energy storage station im And the total power of the energy storage batteries of the ith energy storage power station is obtained.
Optionally, adjusting the range [ Q) based on reactive power in step S3) iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy The method comprises the following steps: based on reactive power regulating range [ Q iymin ,Q iymax ]By means of the existing AVC systemThe reactive power Q used for voltage regulation at the current moment of the ith energy storage power station is obtained through systematic calculation iy 。
In addition, the invention also provides a control system for the unified scheduling of the large-scale energy storage power stations, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the control method for the unified scheduling of the large-scale energy storage power stations.
In addition, the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program which is programmed or configured to execute the control method for the unified scheduling of the large-scale energy storage power station.
Compared with the prior art, the invention has the following advantages:
the method comprises the following steps of controlling unified dispatching of the energy storage power station to effectively coordinate the active power output of the energy storage power station: 1) Determining the active power regulation range [ P ] of the ith energy storage power station imin ,P imax ](ii) a 2) According to the active regulation range [ P imin ,P imax ]And the power grid demand and the battery capacity of the energy storage power station, and determining the active power regulation range [ P ] for frequency modulation of the ith energy storage power station ipmin ,P ipmax ]Battery capacity E ip And the ith seat is used for the active power regulation range [ P ] of peak regulation ifmin ,P ifmax ]Battery capacity E if (ii) a 3) According to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, determining the active power regulation range [ P ] for frequency modulation ipmin ,P ipmax ]And active power regulation range [ P ] for peak shaving ifmin ,P ifmax ]Battery capacity E if Respectively calculating the active power P for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if (ii) a 4) The active power P used for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if Summing to generate an active power scheduling control instruction P of the ith energy storage power station at the current moment i (ii) a 5) Scheduling control instruction P of active power i And issuing the ith energy storage power station to execute according to the preset active power regulation frequency. The invention realizes the purpose of the energy storage power stationThe unified dispatching control effectively coordinates the active power output of the energy storage power station, meets the requirements of the power grid on various application scenes of the energy storage power station, such as transient voltage support, peak regulation, frequency modulation and voltage regulation, effectively improves the stability of the power grid, and effectively improves the utilization efficiency of the energy storage power station.
In addition, the invention can further comprise the step of effectively coordinating the active power output of the energy storage power station through unified scheduling control of the energy storage power station: determining reserved reactive power of any ith energy storage power station for supporting transient voltage; determining a reactive power regulation range of the ith seat for regulating voltage based on the reserved reactive power; determining reactive power used for voltage regulation at the current moment of the ith seat based on the reactive power regulation range; the ith reactive power scheduling control instruction at the current moment is generated based on the reactive power for voltage regulation, and the ith reactive power scheduling control instruction is issued to the ith energy storage power station to be executed according to the preset reactive power regulation frequency, so that the reactive power output of the energy storage power station is effectively coordinated through unified scheduling control of the energy storage power station, the requirements of a power grid on various application scenes of the energy storage power station, such as participation of transient voltage support, peak regulation, frequency modulation and voltage regulation, are met, the stability of the power grid is effectively improved, and the utilization efficiency of the energy storage power station is effectively improved.
Drawings
Fig. 1 is a basic flowchart of an active power adjusting part in the method according to the embodiment of the present invention.
Fig. 2 is a basic flow chart of a reactive power adjusting part in the method according to the embodiment of the invention.
Detailed Description
As shown in fig. 1, the control method for unified scheduling of a large-scale energy storage power station in this embodiment includes the steps of effectively coordinating active power output of the energy storage power station for unified scheduling control of the energy storage power station:
1) Determining the active power regulation range [ P ] of the ith energy storage power station imin ,P imax ]；
2) According to the active regulation range [ P imin ,P imax ]And the power grid demand and the battery electric quantity of the energy storage power station, and determining the active power regulation range [ P ] of the ith energy storage power station for frequency modulation ipmin ,P ipmax ]Battery capacity E ip And ith seat for active power regulation of peak regulationRange [ P ] ifmin ,P ifmax ]Battery capacity E if ；
3) According to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, the active power regulation range [ P ] for frequency modulation is determined ipmin ,P ipmax ]And active power regulation range [ P ] for peak shaving ifmin ,P ifmax ]Battery capacity E if Respectively calculating the active power P for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if ；
4) The active power P used for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if Summing to generate an active power scheduling control instruction P of the ith energy storage power station at the current moment i ；
5) Scheduling control instruction P of active power i And issuing the ith energy storage power station to execute according to the preset active power regulation frequency.
In the embodiment, the active power regulation range [ P ] of any ith energy storage power station is determined in the step 1) imin ,P imax ]The functional expression of (a) is:
in the above formula, P im Rated active power, Q, for the ith energy-storage power station iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power, S, for the ith energy-storage power station im The total capacity of the power converter PCS of the ith energy storage power station.
In this embodiment, the step 2) is based on the active power regulation range [ P imin ,P imax ]And the power grid demand and the battery electric quantity of the energy storage power station, and determining the active power regulation range [ P ] of the ith energy storage power station for frequency modulation ipmin ,P ipmax ]Battery capacity E ip And the ith seat is used for the active power regulation range [ P ] of peak regulation ifmin ,P ifmax ]Battery capacity E if Then, the ith energy storage power station is used for adjusting the active power regulation range [ P ] of frequency modulation ipmin ,P ipmax ]Battery capacity E ip And the ith seat is used for the active power regulation range [ P ] of peak regulation ifmin ,P ifmax ]Battery capacity E if The following constraints are satisfied:
in the above formula, E im For the ith energy storage station battery capacity, T ip And presetting a frequency modulation period for the ith energy storage power station. It should be noted that, in step 2), the range [ P ] is adjusted according to the active power imin ,P imax ]And the power grid demand and the battery capacity of the energy storage power station, and determining the active power regulation range [ P ] for frequency modulation of the ith energy storage power station ipmin ,P ipmax ]Battery capacity E ip And ith active power regulation range [ P ] for peak regulation ifmin ,P ifmax ]Battery capacity E if The method is not fixed and needs to be adjusted according to the requirements of the power grid. For example, in the period of outstanding contradiction between supply and demand of the power grid, the energy storage power station mainly carries out peak shaving and is used for the active power regulation range [ P ] of peak shaving ifmin ,P ifmax ]Battery capacity E if Respectively equal to the active power regulation range [ P ] of the energy storage power station imin ,P imax ]And rated battery capacity E im . Therefore, the contradiction between the supply and the demand of a power grid can be relieved to the greatest extent, and the electricity limit caused by insufficient power supply in the peak period of load or the water, wind and light abandonment caused by the failure of new energy sources such as water, electricity, wind and light in the valley period of load can be reduced. In other time periods, the energy storage power station can mainly adjust the frequency, and the active power adjusting range [ P ] for adjusting the frequency is used ipmin ,P ipmax ]Equal to the active power regulation range P of the energy storage power station imin ,P imax ]. Therefore, the frequency and the depth of the generator sets such as water, fire, wind, light and the like participating in frequency modulation can be reduced to the maximum extent, and the self loss and the fuel of the generator sets are reducedLoss, waste of water/wind/light resources. Or the ith seat is used for the active power regulating range of frequency modulation and peak regulation to be distributed in proportion, namely P ifmin /P ipmin 、P ifmax /P imax Is a fixed value. Or battery capacity apportionment of seat i for frequency and peak modulation, i.e. E if /E ip Is a fixed value. The fixed value is determined according to the running condition of the power grid where the fixed value is located and the actual condition of the ith seat, so that the peak regulation and frequency modulation requirements of the power grid can be flexibly considered, and the utilization efficiency of the energy storage power station is improved.
In the embodiment, the active power P for frequency modulation of the ith energy storage power station at the current moment is calculated in the step 3) ip Comprises the following steps: taking the energy storage power station as a priority regulation object to participate in AGC system control, and according to the current electric quantity E of the ith energy storage power station i Correcting the active power regulation range [ P ] for frequency modulation based on' ipmin ,P′ ipmax ]And then according to the active power regulation range [ P 'used for frequency modulation after correction' ipmin ,P′ ipmax ]Calculating to obtain the active power P for frequency modulation of the ith energy storage power station at the current moment by using the conventional AGC system calculation method ip ；
In the above formula, E imin 、E imax The highest electric quantity and the lowest electric quantity of the battery of the ith energy storage power station are respectively. Wherein, the active power P used for frequency modulation of the ith energy storage power station at the current moment is calculated and obtained by the existing AGC system calculation method ip Then, the corrected active power regulation range [ P 'for frequency modulation' ipmin ,P′ ipmax ]The applications include: and the upper limit and the lower limit are used as inequality constraints when the instruction is calculated, and participate in the existing AGC calculation. It should be noted that the method of the present embodiment does not involve the improvement of the existing calculation method of the AGC systemThe existing AGC system calculation method can adopt various existing AGC system calculation methods according to needs. As an optional implementation manner, the existing AGC system calculation method in this embodiment is specifically a multi-objective AGC coordination optimization method including wind, light, water and fire, which is described in chinese patent application No. 202110189019.5, but this embodiment does not depend on the AGC system calculation method described in this document.
In the embodiment, the active power P for peak shaving of the ith energy storage power station at the current moment is calculated in the step 3) if Comprises the following steps: the ith energy storage power station participates in power grid peak regulation according to a daily load curve and the battery capacity E if Determining the charging and discharging time period and duration of the ith energy storage power station, and adjusting the range [ P ] based on the determined active power for peak shaving ifmin ,P ifmax ]According to a charging period P if ＝P ifmin Discharge period P if ＝P ifmax Calculating to obtain the active power P for peak shaving of the ith energy storage power station at the current moment if 。
As shown in fig. 2, the method of this embodiment further includes a step of effectively coordinating the reactive power output of the energy storage power station for the unified scheduling control of the energy storage power station:
s1) determining reserved reactive power Q for transient voltage support of any ith energy storage power station iz I is the number of the energy storage power station;
s2) based on reserved reactive power Q iz Determining reactive power regulation range [ Q ] of ith seat for regulating voltage iymin ,Q iymax ]；
S3) adjusting the range [ Q ] based on the reactive power iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy ；
S4) reactive power Q based on voltage regulation iy Generating the ith reactive power scheduling control instruction Q at the current moment i And issuing the ith energy storage power station to execute the operation according to the preset reactive power regulation frequency.
In this embodiment, the reserved reactive power Q for supporting the transient voltage of any ith energy storage power station is determined in step S1) iz Q is more than or equal to 0 iz ≤S im In which S is im The total capacity of the power converter PCS of the ith energy storage power station.
In this embodiment, the i-th reactive power regulation range [ Q ] for regulating voltage is determined in step S2) iymin ,Q iymax ]The functional expression of (a) is:
Q iymin ＝-Q im
in the above formula, Q iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power of the ith energy storage power station and rated reactive power Q of the ith energy storage power station im The calculation function expression of (a) is:
in the above formula, S im Total capacity, P, of power converter PCS of ith energy storage power station im And the total power of the energy storage batteries of the ith energy storage power station is obtained.
In this embodiment, the reactive power adjustment range [ Q ] is adjusted in step S3) based on the reactive power iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy The method comprises the following steps: based on reactive power regulation range [ Q iymin ,Q iymax ]And calculating the reactive power Q used for voltage regulation of the ith energy storage power station at the current moment through the existing AVC system iy . Wherein, the reactive power Q used for voltage regulation of the ith energy storage power station at the current moment is obtained by the calculation of the existing AVC system iy Time, reactive power regulation range [ Q iymin ,Q iymax ]The applications include: and when the instruction is calculated, the upper limit and the lower limit are used as inequality constraints to participate in the existing AVC calculation. It should be noted that the method of the present embodiment does not involve improvement of the existing AVC system calculation method, and the existing AVC system calculation method may adopt various existing AVC system calculation methods as needed. As an alternative embodimentIn the embodiment, the existing AVC system calculation method is specifically a power grid automatic voltage control method based on multi-objective optimization, which is described in chinese patent document with application number 201711213445.8, but the embodiment does not depend on the AVC system calculation method described in the document.
In summary, the method of the embodiment includes determining the reserved reactive power of the energy storage power station for transient voltage support according to the needs of the power grid; then according to the capacity of the power converter and the capacity of the battery, sequentially determining a reactive power adjusting range for voltage regulation, an active power adjusting range and the capacity of the battery for frequency modulation, and an active power adjusting range and the capacity of the battery for peak regulation; and finally, respectively calculating and generating an active power dispatching control instruction and a reactive power dispatching control instruction of the ith energy storage power station at the current moment according to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, and issuing the ith energy storage power station to execute. The method realizes the unified scheduling control of the energy storage power station, effectively coordinates the active and reactive power output of the energy storage power station by distributing the power regulation ranges for transient voltage support, voltage regulation, frequency modulation and peak regulation, meets the requirements of a power grid on various application scenes of the energy storage power station, such as transient voltage support, peak regulation, frequency modulation and voltage regulation, effectively improves the stability of the power grid, and effectively improves the utilization efficiency of the energy storage power station.
In addition, the embodiment also provides a control system for unified scheduling of the large-scale energy storage power stations, which includes a microprocessor and a memory that are connected to each other, where the microprocessor is programmed or configured to execute the steps of the control method for unified scheduling of the large-scale energy storage power stations.
In addition, the embodiment also provides a computer readable storage medium, and the computer readable storage medium stores a computer program which is programmed or configured to execute the control method for the unified scheduling of the large-scale energy storage power station.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
Claims (8)
1. A control method for unified scheduling of large-scale energy storage power stations is characterized by comprising the following steps of controlling unified scheduling of the energy storage power stations and effectively coordinating active power output of the energy storage power stations:
1) Determining the active power regulation range [ P ] of the ith energy storage power station imin ,P imax ]；
2) According to the active regulation range [ P imin ,P imax ]And the power grid demand and the battery electric quantity of the energy storage power station, and determining the active power regulation range [ P ] of the ith energy storage power station for frequency modulation ipmin ,P ipmax ]Battery capacity E ip And the ith seat is used for the active power regulation range [ P ] of peak regulation ifmin ,P ifmax ]Battery capacity E if ；
3) According to the real-time operation condition of the power grid and the current electric quantity of the energy storage power station, determining the active power regulation range [ P ] for frequency modulation ipmin ,P ipmax ]And active power regulation range [ P ] for peak shaving ifmin ,P ifmax ]Battery capacity E if Respectively calculating the active power P for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if ；
Wherein, the active power P used for frequency modulation of the ith energy storage power station at the current moment is calculated ip Comprises the following steps: taking the energy storage power station as a priority regulation object to participate in AGC system control, and according to the current electric quantity E of the ith energy storage power station i Correcting the active power regulation range [ P ] for frequency modulation based on' ipmin ,P′ ipmax ]And then according to the corrected active power regulation range [ P 'for frequency modulation' ipmin ,P′ ipmax ]Calculating to obtain the active power P for frequency modulation of the ith energy storage power station at the current moment by using the conventional AGC system calculation method ip ；
In the above formula, E imin 、E imax The maximum electric quantity and the minimum electric quantity of the battery of the ith energy storage power station are respectively;
wherein, the active power P used for peak regulation of the ith energy storage power station at the current moment is calculated if Comprises the following steps: the ith energy storage power station participates in power grid peak regulation according to a daily load curve and the battery capacity E if Determining the charging and discharging time period and duration of the ith energy storage power station, and adjusting the range [ P ] based on the determined active power for peak regulation ifmin ,P ifmax ]According to a charging period P if ＝P ifmin Discharge period P if ＝P ifmax Calculating to obtain the active power P for peak shaving of the ith energy storage power station at the current moment if ；
4) The active power P used for frequency modulation of the ith energy storage power station at the current moment ip And active power P for peak shaving if Summing to generate an active power scheduling control instruction P of the ith energy storage power station at the current moment i ；
5) Scheduling control instruction P of active power i And issuing the ith energy storage power station to execute according to the preset active power regulation frequency.
2. The control method for unified scheduling of large-scale energy storage power stations according to claim 1, wherein the active power regulation range [ P ] of any ith energy storage power station is determined in the step 1) imin ,P imax ]The functional expression of (a) is:
in the above formula, P im Rated active power, Q, for the ith energy-storage power station iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power, S, for the ith energy storage station im The total capacity of the power converter PCS of the ith energy storage power station.
3. The control method for unified scheduling of large-scale energy storage power stations according to claim 2, characterized in that in step 2) according to the active power regulation range [ P ] imin ,P imax ]And the power grid demand and the battery electric quantity of the energy storage power station, and determining the active power regulation range [ P ] of the ith energy storage power station for frequency modulation ipmin ,P ipmax ]Battery capacity E ip And ith active power regulation range [ P ] for peak regulation ifmin ,P ifmax ]Battery capacity E if Then, the ith energy storage power station is used for the active power regulation range [ P ] of frequency modulation ipmin ,P ipmax ]Battery capacity E ip And ith active power regulation range [ P ] for peak regulation ifmin ,P ifmax ]Battery capacity E if The following constraints are satisfied:
in the above formula, E im For the i-th energy storage station battery capacity, T ip And presetting a frequency modulation period for the ith energy storage power station.
4. The control method for the unified scheduling of the large-scale energy storage power stations according to any one of claims 1 to 3, characterized by further comprising the step of controlling the unified scheduling of the energy storage power stations to effectively coordinate the reactive power output of the energy storage power stations:
s1) determining reserved reactive power Q for transient voltage support of any ith energy storage power station iz ；
S2) based on reserved reactive power Q iz Determining reactive power of ith seat for voltage regulationPower regulation range [ Q iymin ,Q iymax ]；
S3) adjusting the range [ Q ] based on the reactive power iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy ；
S4) reactive power Q based on voltage regulation iy Generating the ith reactive power scheduling control instruction Q at the current moment i And sending the ith energy storage power station to execute the operation according to the preset reactive power regulation frequency.
5. The control method for unified scheduling of large-scale energy storage power stations according to claim 4, wherein in step S2), the reactive power regulation range [ Q ] for voltage regulation of the ith station is determined iymin ,Q iymax ]The functional expression of (a) is:
Q iymin ＝-Q im
in the above formula, Q iz Reserved reactive power, Q, for transient voltage support for any ith energy storage station im Rated reactive power of the ith energy storage power station and rated reactive power Q of the ith energy storage power station im The formula of the calculation function is:
in the above formula, S im Total capacity, P, of power converter PCS of ith energy storage station im And the total power of the energy storage batteries of the ith energy storage power station is obtained.
6. A control method for unified scheduling of large-scale energy storage power stations according to claim 5, characterized in that in step S3) the reactive power adjusting range [ Q ] is based on iymin ,Q iymax ]Determining reactive power Q for voltage regulation at the ith moment iy The method comprises the following steps: base ofIn the reactive power regulation range [ Q iymin ,Q iymax ]And calculating the reactive power Q used for voltage regulation of the ith energy storage power station at the current moment through the existing AVC system iy 。
7. A control system for unified scheduling of large-scale energy storage power stations, comprising a microprocessor and a memory which are connected with each other, characterized in that the microprocessor is programmed or configured to execute the steps of the control method for unified scheduling of large-scale energy storage power stations according to any one of claims 1 to 6.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program programmed or configured to execute a control method for the unified scheduling of energy storage power plants on a large scale according to any one of claims 1 to 6.
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| CN114188996B (en) * | 2021-12-06 | 2023-06-23 | 国网湖南省电力有限公司 | Active control method, system and medium in electrochemical energy storage power station adapted to frequency modulation function |
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