CN117895545A - Power grid operation control method for realizing source network load storage coordination - Google Patents
Power grid operation control method for realizing source network load storage coordination Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 283
- 238000010248 power generation Methods 0.000 claims abstract description 54
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 23
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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
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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
- 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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- 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
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention provides a power grid operation control method for realizing source network load storage coordination, which belongs to the technical field of power grid dispatching operation and comprises the following steps: establishing a corresponding relation between each new energy power generation system and a power utilization area to form an electric energy supply and demand chain; constructing an energy storage system cluster, and distributing a corresponding electric energy supply and demand chain as a main electric energy supply and demand chain for each energy storage system in the energy storage system cluster; dividing the energy storage system into at least two energy storage subsystems, monitoring the electric energy state of a main electric energy supply and demand chain, controlling the main electric energy supply and demand chain to charge the energy storage subsystems when the supply is greater than the demand, and requesting to charge adjacent energy storage systems when the electric energy carried by the energy storage system is smaller than the difference value of the supply and demand electric energy; and when the supply time is less than the supply time, controlling the energy storage system to discharge to the main electric energy supply and demand chain, and when the energy storage system can release electric energy less than the difference value of the supply and demand electric energy, requesting the adjacent energy storage systems to discharge to the main electric energy supply and demand chain. The invention ensures the complete charge and discharge of the energy storage system and ensures the service life of the energy storage system.
Description
Technical Field
The invention belongs to the technical field of power grid dispatching operation, and particularly relates to a power grid operation control method for realizing source network load storage coordination.
Background
With the development of new energy power generation systems as renewable energy sources, such as wind energy and solar energy, the disadvantage of instability leads to the failure of the grid operation to completely deviate from the traditional thermal power generation form, such as solar energy being affected by weather conditions, while wind energy is affected by wind speed. The energy storage system is introduced to supplement the power grid as a new generation power grid operation mode, when the electric energy generated by the new energy exceeds the electric load demand, the electric energy is stored, and when the electric energy generated by the new energy cannot meet the electric load demand, the released electric energy is released to make up for the gap of the power grid operation, thereby overcoming the fluctuation of the new energy generation and completely discarding the traditional thermal power generation mode.
However, the existing power grid load storage operation mode also has problems that because of the imbalance in time and space of the power load, the states of the energy storage systems in different position areas are different, for example, the residual electric energy generated by the new energy source in the area is remained after the power load is used for charging the energy storage systems, the residual electric energy generated by the new energy source after the power load is used for power generation in the area can not meet the charging requirement of the energy storage systems, the electric energy in the area with the residual electric energy is wasted, the area with the charging requirement of the energy storage systems can not be met, the later-stage released electric energy is insufficient, the service life of the energy storage systems is determined by the charging and discharging times, and the life cycle of the energy storage systems can be influenced due to incomplete charging and discharging.
This is a deficiency of the prior art, and therefore, it is necessary to provide a power grid operation control method for realizing source-grid load storage coordination, aiming at the above-mentioned deficiency in the prior art.
Disclosure of Invention
Aiming at the defects that in the prior art, the power load imbalance causes that new energy sources meet the power load and the energy storage system is possibly wasted after being charged, and the residual energy sources do not meet the full charging requirement of the energy storage system after the new energy sources meet the power load, so that the service life of the energy storage system is influenced, the invention provides a power grid operation control method for realizing the cooperation of the power grid and the energy storage system, and aims to solve the technical problems.
The invention provides a power grid operation control method for realizing source network load storage coordination, which comprises the following steps:
s1, establishing a corresponding relation between each new energy power generation system and a power utilization area to form a plurality of electric energy supply and demand chains;
s2, constructing an energy storage system cluster, and distributing a corresponding electric energy supply and demand chain to each energy storage system in the energy storage system cluster as a main electric energy supply and demand chain;
s3, dividing the energy storage system into at least two energy storage subsystems, monitoring the electric energy state of a main electric energy supply and demand chain, and controlling the main electric energy supply and demand chain to charge one energy storage subsystem when the supply is more than the demand, and controlling one energy storage subsystem to discharge the main electric energy supply and demand chain when the supply is less than the demand;
s4, monitoring states of all energy storage subsystems in the energy storage system, when the supply is larger than the demand, and when the energy storage subsystems in the energy storage system can bear electric energy less than a difference value of supply and demand electric energy, controlling a main electric energy supply and demand chain to charge the energy storage system, simultaneously requesting to charge adjacent energy storage systems which can bear electric energy, and when the supply is smaller than the demand, and when the energy storage subsystems in the energy storage system can release electric energy less than the difference value of supply and demand electric energy, requesting the energy storage system to discharge, and simultaneously requesting the energy storage system which can release electric energy to discharge to the main electric energy supply and demand chain.
Further, the specific steps of step S1 are as follows:
s11, acquiring geographic positions of each power utilization area and each new energy power generation system, and calculating relative distances between each power utilization area and each new energy power generation system;
s12, generating a power supply set by each new energy power generation system;
s13, positioning an electricity utilization area;
s14, screening a new energy power generation system with the relative distance between the new energy power generation system and the positioned power utilization area smaller than a threshold value from the power supply set to be used as an optional power supply set;
s15, estimating the power load of each power utilization area, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set, and deleting the selected new energy power generation system from the power supply set;
s16, judging whether the electricity utilization area is positioned completely;
if yes, go to step S17;
if not, positioning the next electricity utilization area, and returning to the step S14;
s17, taking each electricity utilization area and the new energy power generation system distributed for the electricity utilization areas as an electric energy supply and demand chain.
Further, the specific steps of step S15 are as follows:
s151, estimating the power load of each power utilization area based on the historical load;
s152, obtaining power prediction values of all new energy power generation systems;
s153, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set by combining power prediction values of the new energy systems, and ensuring that the sum of the power prediction values of the selected new energy power generation systems is larger than a power load estimated value of the power utilization area and the difference value of the power prediction values of the power utilization areas is smaller than a set threshold value;
s154, deleting the selected new energy power generation system from the power supply set, and ensuring that one new energy power generation system corresponds to only one power utilization area.
Further, the specific steps of step S2 are as follows:
s21, generating an energy storage system cluster by using the energy storage systems within a set distance range;
s22, calculating the relative distance between each energy storage system and each electric energy supply and demand chain in the energy storage system cluster, distributing an electric energy supply and demand chain with the relative distance smaller than a threshold value for each energy storage system, and taking the distributed electric energy supply and demand chain as a main electric energy supply and demand chain of the energy storage system.
Further, the specific steps of step S3 are as follows:
s31, dividing each energy storage system into at least two energy storage subsystems according to the scale and the topological structure of the energy storage system;
s32, positioning an energy storage system, and monitoring the electric energy state of a main electric energy supply and demand chain of the positioned energy storage system;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S33 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S34 is entered;
s33, controlling a power bus corresponding to a main power supply and demand chain to charge one energy storage subsystem in the energy storage system, and entering step S4;
s34, controlling an energy storage subsystem in the energy storage system to generate power to the power load of the power utilization area corresponding to the main power supply and demand chain.
Further, the specific steps of step S4 are as follows:
s41, marking the states of all energy storage subsystems in the energy storage system; the energy storage subsystem state comprises a full charge state, a empty discharge state, a charge state and a discharge state;
s42, judging the state of the energy storage system corresponding to the main electric energy supply and demand chain;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S43 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S45 is entered;
s43, calculating a difference value between the power generation electric energy of each new energy system in the main electric energy supply and demand chain and the electric load demand of the power utilization area as a first difference value, and judging whether each energy storage subsystem in the energy storage system can bear electric energy which is smaller than the first difference value;
if yes, go to step S44;
if not, controlling the main electric energy supply and demand chain to charge the corresponding energy storage subsystem of the energy storage system, and returning to the step S41;
s44, when the main electric energy supply and demand chain is controlled to charge the corresponding energy storage subsystem of the energy storage system, the adjacent energy storage system capable of bearing electric energy is requested to be charged, and the step S41 is returned;
s45, calculating a difference value between the power load demand of a power utilization area in a main power supply and demand chain and the power generated by each new energy power generation system as a second difference value, and judging whether the releasable power of each energy storage subsystem in the energy storage system is smaller than the second difference value;
if yes, go to step S46;
if not, controlling each energy storage subsystem of the energy storage system to discharge to the main electric energy supply and demand chain, and returning to the step S41;
s46, controlling each energy storage subsystem of the energy storage system to discharge to the main electric energy supply and demand chain, simultaneously requesting the adjacent energy storage system capable of releasing electric energy to discharge to the main electric energy supply and demand chain, and returning to the step S41.
Further, in step S43, it is determined whether the electric energy carried by each energy storage subsystem in the energy storage system is smaller than the first difference, which specifically includes the following steps:
fully charging an energy storage subsystem in a discharging empty state and a charging state in the energy storage system to obtain electric energy which is needed by the full charge of the energy storage subsystem and can bear the electric energy;
it is determined whether the loadable electric energy is less than the first difference.
Further, the specific steps of step S44 are as follows:
s441, controlling a main electric energy supply and demand chain to charge an energy storage subsystem in a charging state in the energy storage system, and then charging the energy storage subsystem in a discharging empty state in the energy storage system;
s442, positioning adjacent energy storage systems according to the relative distance between the energy storage systems and the main electric energy supply and demand chain;
s443, judging whether an energy storage system in a charging state or a discharging empty state exists in the positioned energy storage systems;
if yes, go to step S445;
if not, go to step S444;
s444, positioning the next energy storage subsystem, and returning to the step S443;
s445, the main power supply and demand chain requests to charge the positioned energy storage system, and the step S441 is returned.
Further, in step S45, it is determined whether the releasable electric energy of each energy storage subsystem in the energy storage system is smaller than the second difference value, which specifically includes the following steps:
taking the electric energy of the energy storage subsystem in a full state and a discharging state in the energy storage system as releasable electric energy;
it is determined whether the releasable energy is less than the second difference.
Further, the specific steps of step S46 are as follows:
s461, controlling an energy storage subsystem in a discharging state in the energy storage system to discharge to a main electric energy supply and demand chain firstly, and discharging the energy storage subsystem in a full state in the energy storage system to the main electric energy supply and demand chain again;
s462, positioning adjacent energy storage systems according to the relative distance between the adjacent energy storage systems and a main electric energy supply and demand chain;
s463, judging whether an energy storage system in a discharging state or a full-charging state exists in the positioned energy storage systems;
if yes, go to step S465;
if not, go to step S464;
s464, positioning the next energy storage subsystem, and returning to the step S463;
s465, requesting the energy storage system to be positioned to discharge for the main power supply and demand chain, and returning to the step S461.
The invention has the beneficial effects that:
according to the power grid operation control method for realizing the source network charge storage coordination, the energy storage system clusters are established, and the energy storage systems are divided into sub-systems, so that the complete charge and discharge of the energy storage systems are ensured while the energy storage systems are kept under the action of the source network charge storage coordination, and the service life of the energy storage systems is guaranteed to the greatest extent.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
It can be seen that the present invention has outstanding substantial features and significant advances over the prior art, as well as the benefits of its implementation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of an embodiment of a power grid operation control method for realizing source network load storage coordination in the invention.
Fig. 2 is a schematic flow chart of another embodiment of a power grid operation control method for realizing source network load storage coordination according to the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1:
as shown in fig. 1, the invention provides a power grid operation control method for realizing source network load storage coordination, which comprises the following steps:
s1, establishing a corresponding relation between each new energy power generation system and a power utilization area to form a plurality of electric energy supply and demand chains;
s2, constructing an energy storage system cluster, and distributing a corresponding electric energy supply and demand chain to each energy storage system in the energy storage system cluster as a main electric energy supply and demand chain;
s3, dividing the energy storage system into at least two energy storage subsystems, monitoring the electric energy state of a main electric energy supply and demand chain, and controlling the main electric energy supply and demand chain to charge one energy storage subsystem when the supply is more than the demand, and controlling one energy storage subsystem to discharge the main electric energy supply and demand chain when the supply is less than the demand;
s4, monitoring states of all energy storage subsystems in the energy storage system, when the supply is larger than the demand, and when the energy storage subsystems in the energy storage system can bear electric energy less than a difference value of supply and demand electric energy, controlling a main electric energy supply and demand chain to charge the energy storage system, simultaneously requesting to charge adjacent energy storage systems which can bear electric energy, and when the supply is smaller than the demand, and when the energy storage subsystems in the energy storage system can release electric energy less than the difference value of supply and demand electric energy, requesting the energy storage system to discharge, and simultaneously requesting the energy storage system which can release electric energy to discharge to the main electric energy supply and demand chain.
Example 2:
as shown in fig. 2, the invention provides a power grid operation control method for realizing source network load storage coordination, which comprises the following steps:
s1, establishing a corresponding relation between each new energy power generation system and a power utilization area to form a plurality of electric energy supply and demand chains; the specific steps of the step S1 are as follows:
s11, acquiring geographic positions of each power utilization area and each new energy power generation system, and calculating relative distances between each power utilization area and each new energy power generation system;
s12, generating a power supply set by each new energy power generation system;
s13, positioning an electricity utilization area;
s14, screening a new energy power generation system with the relative distance between the new energy power generation system and the positioned power utilization area smaller than a threshold value from the power supply set to be used as an optional power supply set;
s15, estimating the power load of each power utilization area, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set, and deleting the selected new energy power generation system from the power supply set; the specific steps of step S15 are as follows:
s151, estimating the power load of each power utilization area based on the historical load;
s152, obtaining power prediction values of all new energy power generation systems;
s153, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set by combining power prediction values of the new energy systems, and ensuring that the sum of the power prediction values of the selected new energy power generation systems is larger than a power load estimated value of the power utilization area and the difference value of the power prediction values of the power utilization areas is smaller than a set threshold value;
s154, deleting the selected new energy power generation system from the power supply set, and ensuring that one new energy power generation system corresponds to only one power utilization area;
s16, judging whether the electricity utilization area is positioned completely;
if yes, go to step S17;
if not, positioning the next electricity utilization area, and returning to the step S14;
s17, taking each power utilization area and a new energy power generation system distributed for the power utilization areas as an electric energy supply and demand chain;
s2, constructing an energy storage system cluster, and distributing a corresponding electric energy supply and demand chain to each energy storage system in the energy storage system cluster as a main electric energy supply and demand chain; the specific steps of the step S2 are as follows:
s21, generating an energy storage system cluster by using the energy storage systems within a set distance range;
s22, calculating the relative distance between each energy storage system and each electric energy supply and demand chain in the energy storage system cluster, distributing an electric energy supply and demand chain with the relative distance smaller than a threshold value for each energy storage system, and taking the distributed electric energy supply and demand chain as a main electric energy supply and demand chain of the energy storage system;
s3, dividing the energy storage system into at least two energy storage subsystems, monitoring the electric energy state of a main electric energy supply and demand chain, and controlling the main electric energy supply and demand chain to charge one energy storage subsystem when the supply is more than the demand, and controlling one energy storage subsystem to discharge the main electric energy supply and demand chain when the supply is less than the demand; the specific steps of the step S3 are as follows:
s31, dividing each energy storage system into at least two energy storage subsystems according to the scale and the topological structure of the energy storage system;
s32, positioning an energy storage system, and monitoring the electric energy state of a main electric energy supply and demand chain of the positioned energy storage system;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S33 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S34 is entered;
s33, controlling a power bus corresponding to a main power supply and demand chain to charge one energy storage subsystem in the energy storage system, and entering step S4;
s34, controlling an energy storage subsystem in the energy storage system to generate power to an electric load of an electric power utilization area corresponding to a main electric energy supply and demand chain;
s4, monitoring states of all energy storage subsystems in the energy storage system, when the supply is larger than the demand, and when the energy storage subsystems in the energy storage system can bear electric energy less than a difference value of supply and demand electric energy, controlling a main electric energy supply and demand chain to charge the energy storage system, simultaneously requesting to charge adjacent energy storage systems which can bear electric energy, and when the supply is smaller than the demand, and when the energy storage subsystems in the energy storage system can release electric energy less than the difference value of supply and demand electric energy, requesting the energy storage system to discharge, and simultaneously requesting the energy storage system which can release electric energy to discharge to the main electric energy supply and demand chain; the specific steps of the step S4 are as follows:
s41, marking the states of all energy storage subsystems in the energy storage system; the energy storage subsystem state comprises a full charge state, a empty discharge state, a charge state and a discharge state;
s42, judging the state of the energy storage system corresponding to the main electric energy supply and demand chain;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S43 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S45 is entered;
s43, calculating a difference value between the power generation electric energy of each new energy system in the main electric energy supply and demand chain and the electric load demand of the power utilization area as a first difference value, and judging whether each energy storage subsystem in the energy storage system can bear electric energy which is smaller than the first difference value;
if yes, go to step S44;
if not, controlling the main electric energy supply and demand chain to charge the corresponding energy storage subsystem of the energy storage system, and returning to the step S41;
it should be noted that, in step S43, it is determined whether the electric energy carried by each energy storage subsystem in the energy storage system is smaller than the first difference, and the specific steps are as follows:
fully charging an energy storage subsystem in a discharging empty state and a charging state in the energy storage system to obtain electric energy which is needed by the full charge of the energy storage subsystem and can bear the electric energy;
judging whether the loadable electric energy is smaller than a first difference value or not;
s44, when the main electric energy supply and demand chain is controlled to charge the corresponding energy storage subsystem of the energy storage system, the adjacent energy storage system capable of bearing electric energy is requested to be charged, and the step S41 is returned; the specific steps of step S44 are as follows:
s441, controlling a main electric energy supply and demand chain to charge an energy storage subsystem in a charging state in the energy storage system, and then charging the energy storage subsystem in a discharging empty state in the energy storage system;
s442, positioning adjacent energy storage systems according to the relative distance between the energy storage systems and the main electric energy supply and demand chain;
s443, judging whether an energy storage system in a charging state or a discharging empty state exists in the positioned energy storage systems;
if yes, go to step S445;
if not, go to step S444;
s444, positioning the next energy storage subsystem, and returning to the step S443;
s445, the main electric energy supply and demand chain requests to charge the positioned energy storage system, and the step S441 is returned;
s45, calculating a difference value between the power load demand of a power utilization area in a main power supply and demand chain and the power generated by each new energy power generation system as a second difference value, and judging whether the releasable power of each energy storage subsystem in the energy storage system is smaller than the second difference value;
if yes, go to step S46;
if not, controlling each energy storage subsystem of the energy storage system to discharge to the main electric energy supply and demand chain, and returning to the step S41;
it should be noted that, in step S45, it is determined whether the releasable electric energy of each energy storage subsystem in the energy storage system is smaller than the second difference, and the specific steps are as follows:
taking the electric energy of the energy storage subsystem in a full state and a discharging state in the energy storage system as releasable electric energy;
judging whether the releasable electric energy is smaller than a second difference value or not;
s46, controlling each energy storage subsystem of the energy storage system to discharge to a main electric energy supply and demand chain, simultaneously requesting the adjacent energy storage system capable of releasing electric energy to discharge to the main electric energy supply and demand chain, and returning to the step S41; the specific steps of step S46 are as follows:
s461, controlling an energy storage subsystem in a discharging state in the energy storage system to discharge to a main electric energy supply and demand chain firstly, and discharging the energy storage subsystem in a full state in the energy storage system to the main electric energy supply and demand chain again;
s462, positioning adjacent energy storage systems according to the relative distance between the adjacent energy storage systems and a main electric energy supply and demand chain;
s463, judging whether an energy storage system in a discharging state or a full-charging state exists in the positioned energy storage systems;
if yes, go to step S465;
if not, go to step S464;
s464, positioning the next energy storage subsystem, and returning to the step S463;
s465, requesting the energy storage system to be positioned to discharge for the main power supply and demand chain, and returning to the step S461.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The power grid operation control method for realizing the coordination of source network and load storage is characterized by comprising the following steps:
s1, establishing a corresponding relation between each new energy power generation system and a power utilization area to form a plurality of electric energy supply and demand chains;
s2, constructing an energy storage system cluster, and distributing a corresponding electric energy supply and demand chain to each energy storage system in the energy storage system cluster as a main electric energy supply and demand chain;
s3, dividing the energy storage system into at least two energy storage subsystems, monitoring the electric energy state of a main electric energy supply and demand chain, and controlling the main electric energy supply and demand chain to charge one energy storage subsystem when the supply is more than the demand, and controlling one energy storage subsystem to discharge the main electric energy supply and demand chain when the supply is less than the demand;
s4, monitoring states of all energy storage subsystems in the energy storage system, when the supply is larger than the demand, and when the energy storage subsystems in the energy storage system can bear electric energy less than a difference value of supply and demand electric energy, controlling a main electric energy supply and demand chain to charge the energy storage system, simultaneously requesting to charge adjacent energy storage systems which can bear electric energy, and when the supply is smaller than the demand, and when the energy storage subsystems in the energy storage system can release electric energy less than the difference value of supply and demand electric energy, requesting the energy storage system to discharge, and simultaneously requesting the energy storage system which can release electric energy to discharge to the main electric energy supply and demand chain.
2. The power grid operation control method for realizing source network load storage coordination according to claim 1, wherein the specific steps of step S1 are as follows:
s11, acquiring geographic positions of each power utilization area and each new energy power generation system, and calculating relative distances between each power utilization area and each new energy power generation system;
s12, generating a power supply set by each new energy power generation system;
s13, positioning an electricity utilization area;
s14, screening a new energy power generation system with the relative distance between the new energy power generation system and the positioned power utilization area smaller than a threshold value from the power supply set to be used as an optional power supply set;
s15, estimating the power load of each power utilization area, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set, and deleting the selected new energy power generation system from the power supply set;
s16, judging whether the electricity utilization area is positioned completely;
if yes, go to step S17;
if not, positioning the next electricity utilization area, and returning to the step S14;
s17, taking each electricity utilization area and the new energy power generation system distributed for the electricity utilization areas as an electric energy supply and demand chain.
3. The power grid operation control method for realizing source network load storage coordination according to claim 2, wherein the specific steps of step S15 are as follows:
s151, estimating the power load of each power utilization area based on the historical load;
s152, obtaining power prediction values of all new energy power generation systems;
s153, selecting a new energy power generation system for supplying power to each power utilization area from the selectable power supply set by combining power prediction values of the new energy systems, and ensuring that the sum of the power prediction values of the selected new energy power generation systems is larger than a power load estimated value of the power utilization area and the difference value of the power prediction values of the power utilization areas is smaller than a set threshold value;
s154, deleting the selected new energy power generation system from the power supply set, and ensuring that one new energy power generation system corresponds to only one power utilization area.
4. The power grid operation control method for realizing source network load storage coordination according to claim 2, wherein the specific steps of step S2 are as follows:
s21, generating an energy storage system cluster by using the energy storage systems within a set distance range;
s22, calculating the relative distance between each energy storage system and each electric energy supply and demand chain in the energy storage system cluster, distributing an electric energy supply and demand chain with the relative distance smaller than a threshold value for each energy storage system, and taking the distributed electric energy supply and demand chain as a main electric energy supply and demand chain of the energy storage system.
5. The power grid operation control method for realizing source network load storage coordination according to claim 4, wherein the specific steps of step S3 are as follows:
s31, dividing each energy storage system into at least two energy storage subsystems according to the scale and the topological structure of the energy storage system;
s32, positioning an energy storage system, and monitoring the electric energy state of a main electric energy supply and demand chain of the positioned energy storage system;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S33 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S34 is entered;
s33, controlling a power bus corresponding to a main power supply and demand chain to charge one energy storage subsystem in the energy storage system, and entering step S4;
s34, controlling an energy storage subsystem in the energy storage system to generate power to the power load of the power utilization area corresponding to the main power supply and demand chain.
6. The power grid operation control method for realizing source network load storage coordination according to claim 5, wherein the specific steps of step S4 are as follows:
s41, marking the states of all energy storage subsystems in the energy storage system; the energy storage subsystem state comprises a full charge state, a empty discharge state, a charge state and a discharge state;
s42, judging the state of the energy storage system corresponding to the main electric energy supply and demand chain;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is greater than the electric load demand of the electricity consumption area, the step S43 is entered;
when the generated electric energy of each new energy system in the main electric energy supply and demand chain is smaller than the electric load demand of the electricity consumption area, the step S45 is entered;
s43, calculating a difference value between the power generation electric energy of each new energy system in the main electric energy supply and demand chain and the electric load demand of the power utilization area as a first difference value, and judging whether each energy storage subsystem in the energy storage system can bear electric energy which is smaller than the first difference value;
if yes, go to step S44;
if not, controlling the main electric energy supply and demand chain to charge the corresponding energy storage subsystem of the energy storage system, and returning to the step S41;
s44, when the main electric energy supply and demand chain is controlled to charge the corresponding energy storage subsystem of the energy storage system, the adjacent energy storage system capable of bearing electric energy is requested to be charged, and the step S41 is returned;
s45, calculating a difference value between the power load demand of a power utilization area in a main power supply and demand chain and the power generated by each new energy power generation system as a second difference value, and judging whether the releasable power of each energy storage subsystem in the energy storage system is smaller than the second difference value;
if yes, go to step S46;
if not, controlling each energy storage subsystem of the energy storage system to discharge to the main electric energy supply and demand chain, and returning to the step S41;
s46, controlling each energy storage subsystem of the energy storage system to discharge to the main electric energy supply and demand chain, simultaneously requesting the adjacent energy storage system capable of releasing electric energy to discharge to the main electric energy supply and demand chain, and returning to the step S41.
7. The method for controlling power grid operation to realize source-grid charge-storage coordination according to claim 6, wherein in step S43, it is determined whether each energy storage subsystem in the energy storage system can bear electric energy less than a first difference value, and the specific steps are as follows:
fully charging an energy storage subsystem in a discharging empty state and a charging state in the energy storage system to obtain electric energy which is needed by the full charge of the energy storage subsystem and can bear the electric energy;
it is determined whether the loadable electric energy is less than the first difference.
8. The grid operation control method for realizing source grid charge storage coordination according to claim 6, wherein the specific steps of step S44 are as follows:
s441, controlling a main electric energy supply and demand chain to charge an energy storage subsystem in a charging state in the energy storage system, and then charging the energy storage subsystem in a discharging empty state in the energy storage system;
s442, positioning adjacent energy storage systems according to the relative distance between the energy storage systems and the main electric energy supply and demand chain;
s443, judging whether an energy storage system in a charging state or a discharging empty state exists in the positioned energy storage systems;
if yes, go to step S445;
if not, go to step S444;
s444, positioning the next energy storage subsystem, and returning to the step S443;
s445, the main power supply and demand chain requests to charge the positioned energy storage system, and the step S441 is returned.
9. The method for controlling power grid operation to realize source-grid charge-storage coordination according to claim 6, wherein in step S45, it is determined whether the releasable electric energy of each energy storage subsystem in the energy storage system is smaller than a second difference value, and the specific steps are as follows:
taking the electric energy of the energy storage subsystem in a full state and a discharging state in the energy storage system as releasable electric energy;
it is determined whether the releasable energy is less than the second difference.
10. The grid operation control method for realizing source grid charge storage coordination according to claim 6, wherein the specific steps of step S46 are as follows:
s461, controlling an energy storage subsystem in a discharging state in the energy storage system to discharge to a main electric energy supply and demand chain firstly, and discharging the energy storage subsystem in a full state in the energy storage system to the main electric energy supply and demand chain again;
s462, positioning adjacent energy storage systems according to the relative distance between the adjacent energy storage systems and a main electric energy supply and demand chain;
s463, judging whether an energy storage system in a discharging state or a full-charging state exists in the positioned energy storage systems;
if yes, go to step S465;
if not, go to step S464;
s464, positioning the next energy storage subsystem, and returning to the step S463;
s465, requesting the energy storage system to be positioned to discharge for the main power supply and demand chain, and returning to the step S461.
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