CN115276065A - Energy storage system capacity configuration method, equipment and medium based on loss calculation - Google Patents
Energy storage system capacity configuration method, equipment and medium based on loss calculation Download PDFInfo
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Abstract
The invention provides a method, equipment and medium for configuring capacity of an energy storage system based on loss calculation, wherein the method comprises the following steps: s1, considering ohmic resistance brought by connection of a diaphragm resistor, an electrode material, electrolyte, fluid and a tab in a battery and a polarization resistor generated instantly by loading current, and establishing a charge-discharge loss index of the energy storage battery; s2, considering the loss of a direct current cable, the loss of low, medium and high voltage cables, the loss of a PCS (Power conversion System) and the loss of a box transformer substation of the energy storage system, and establishing an energy storage system loss index; s3, considering internal power supply of the auxiliary system, and establishing an energy storage auxiliary loss index based on power consumption of the cooling system, the PCS, the BMS and the video monitoring system; and S4, confirming the configuration capacity of the energy storage system according to the power of the grid-connected point of the optical storage station, the discharge time, whether the auxiliary system is powered by the energy storage system or not and whether the auxiliary system is required to discharge at constant power or not. The invention quantifies the charge-discharge loss of the energy storage equipment and establishes a more accurate energy storage system loss model.
Description
Technical Field
The invention belongs to the technical field of power generation side energy storage, relates to a capacity configuration method of a new energy power generation side energy storage system, and particularly relates to a capacity configuration method, equipment and medium of an energy storage system based on loss calculation.
Background
The energy storage system is a starting heating point of new energy projects at home and abroad at present. With global carbon reduction becoming a world consensus, the construction of energy supply systems mainly based on clean energy such as wind power and photovoltaic has become an important target of world energy transformation. In order to promote the vigorous development of the new energy power generation field, the power grid is required to have strong new energy power transmission and consumption capacity, and the large-scale energy storage system arranged on the new energy power generation side is obviously helpful for the new energy power station to access a power system, the consumption of renewable energy, the frequency modulation and peak shaving of the power grid side and the like.
At present, various provinces in China have developed a plurality of policies, and in order to improve the consumption capacity of newly-built wind power and photovoltaic power generation projects, reasonable planning and construction of novel energy storage facilities with proper scales are required. The installed capacity of the energy storage system is configured according to the requirements of different provinces and cities, generally according to the minimum 10% -20% of the installed capacity of a power station, and certain requirements are also imposed on the duration of energy storage equipment.
At the same time, the overseas energy storage system is typically configured with consideration to its economic efficiency and power requirements of the grid-connected point. The initial power and the discharge time of the energy storage system are selected by determining the construction application, the business mode, the installed scale of the new energy power station and the like of the new energy power station.
The existing energy storage capacity configuration mode is generally used for configuring the installed capacity of an energy storage system by applying a capacity annual attenuation (SOH) curve according to the initial power and the discharge duration of the energy storage system. However, the system loss and the auxiliary power consumption of the energy storage facility are not considered in detail, so that the power from the energy storage system to the grid-connected point cannot meet the system requirement after long-time operation.
Disclosure of Invention
The first objective of the present invention is to provide a method for configuring capacity of an energy storage system based on loss calculation, so as to ensure that the electric quantity of a grid-connected point can meet the overall requirements of the system, in order to consider the charging and discharging efficiency of the energy storage facility, the system loss and the auxiliary power consumption loss.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a capacity configuration method of an energy storage system based on loss calculation is characterized in that: the method is applied to a large-scale energy storage system on a power generation side, and comprises the following steps:
s1, considering that the inside of the battery consists of a diaphragm resistor, an electrode material and an electrolyteOhmic resistance brought by the connection of fluid and polar ear and polarization resistance generated instantly by loading current, and establishing charge-discharge loss index P of the energy storage batterycha、Pdis；
Charging and discharging loss P of energy storage batterycha、PdisRespectively as follows:
wherein: pdisThe power loss of the energy storage system in the charging process is avoided; pchaThe power loss of the energy storage system in the discharging process is obtained;
rated ampere hours for one cell;
is the rated operating voltage of one cell;
the maximum energy capacity of the energy storage system; r is the internal resistance of one cell; k is the polarization resistance of one cell; e is the electric energy stored by the energy storage system; pbatThe energy storage system power;
s2, considering direct-current cable loss, low, medium and high-voltage cable loss, PCS (Power distribution System) loss and box transformer substation loss of the energy storage system, and establishing an energy storage system loss index Psys；
Psys＝Pcab+Ppcs+Psts (0.11)
Ppcs＝(1-α)PP (0.13)
Psts＝(1-β)Ps (0.14)
Wherein: pcabThe line loss from the energy storage system to the grid-connected point; I.C. ADCIs the current flowing through the direct current cable; r isDCIs the wire resistance of the direct current cable; I.C. ALVACIs the current flowing through the single-phase low-voltage alternating-current cable; rLVACThe wire resistance is of a single-phase low-voltage alternating-current cable; i isMVACIs the current flowing through the single-phase medium-voltage alternating-current cable; rMVACIs the line resistance of a single-phase medium-voltage alternating current cable; i isHVACThe current flows through the single-phase high-voltage alternating-current cable; rHVACThe wire resistance of the single-phase high-voltage alternating-current cable; ppcsPower loss on PCS; p isPPower input for the direct current side of the PCS; alpha is the conversion efficiency of PCS, and is a constant; p isstsIs the power loss on the box transformer; p issThe power input for the low-voltage side of the box transformer substation; beta is the conversion efficiency of the box transformer substation, and beta is a constant;
s3, considering internal power supply of the auxiliary system, and establishing an energy storage auxiliary loss index P based on power consumption of the cooling system, the PCS, the BMS and the video monitoring systemaux；
Wherein: pauxAuxiliary system power consumption for energy storage; p isbOutputting power for the energy storage container;
the energy consumption coefficient of the temperature control system of the energy storage container; xi is the power consumption coefficient of the PCS equipment; epsilon is the power consumption coefficient of the BMS system of the energy storage container; mu is the power consumption coefficient of the video monitoring system of the energy storage container;
s4, confirming the configuration capacity of the energy storage system according to the power and the discharge duration of the grid-connected point of the optical storage station, whether the auxiliary system is powered by the energy storage system or not and whether the auxiliary system is powered by the constant-power discharge requirement or not;
considering the static loss of the battery in the transportation process, the loss in the installation and debugging process and the heat loss generated by environmental factors, and setting a redundancy coefficient to cover the capacity consumption of the storage battery caused by the loss, the final capacity of the energy storage system is configured as follows:
wherein: ebatThe capacity of the energy storage system to be configured; pbatThe energy storage system power; p ispocThe power requirement of the grid-connected point is met; h is the discharge duration requirement of the energy storage system; λ is a redundancy coefficient.
A second object of the present invention is to provide an electronic device.
Therefore, the above purpose of the invention is realized by the following technical scheme:
an electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the processor when executing the computer program realizes the energy storage system capacity configuration method steps based on loss calculation as described in the foregoing.
It is yet another object of the present invention to provide a non-transitory computer readable storage medium.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program when executed by a processor implements the energy storage system capacity configuration method steps based on loss calculations as described hereinbefore.
The invention provides a method, equipment and a medium for energy storage system capacity configuration based on loss calculation, aiming at the problems that the existing energy storage capacity configuration scheme has incomplete consideration on the charging and discharging loss of energy storage equipment, inaccurate calculation on the system loss and auxiliary power consumption loss and the like, the method, the equipment and the medium are based on ohmic resistance and polarization resistance in the energy storage equipment, and the charging and discharging loss expression is perfected; meanwhile, a loss model of the energy storage system is established by considering the charge and discharge loss, the line loss of the energy storage system, the PCS loss, the box transformer substation loss, the auxiliary power consumption and the like; and finally, considering the requirements of the grid-connected point power, the discharge duration, the constant power discharge and the like of the energy storage power station, and providing an energy storage system capacity configuration method based on loss calculation. Compared with the traditional energy storage system capacity configuration scheme, the scheme quantifies the charge-discharge loss of the energy storage equipment, establishes a more accurate energy storage system loss model, comprehensively considers the overall direct current cable loss, PCS loss, low-voltage alternating current cable loss, box transformer loss, medium-voltage alternating current cable loss, main transformer loss, high-voltage alternating current cable loss and auxiliary power consumption loss (including an air conditioner, a battery management system and a video monitoring system) of the energy storage system, perfects the loss model needing to be considered in the energy storage system capacity configuration process, and enables the configuration capacity of the energy storage system to meet the requirement more accurately. The invention can more accurately respond to the requirement of the power grid, and avoids the phenomenon of less distribution or over distribution of the energy storage capacity on the premise of ensuring the power supply reliability and the stability of the power grid.
Drawings
Fig. 1 is a main wiring diagram of an energy storage system.
Fig. 2 is a flowchart of a method for configuring capacity of an energy storage system based on loss calculation according to the present invention.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
As shown in fig. 1, the main connection diagram of the energy storage system includes an energy storage device 1, a dc cable 2, a PCS device 3, a low-voltage ac cable 4, a box-to-box system 5, a medium-voltage ac cable 6, a main transformer 7, and a high-voltage ac cable 8.
An energy storage capacity configuration method considering system loss comprises the following steps:
s1, considering ohmic resistance brought by diaphragm resistance, electrode materials, electrolyte, fluid, connection of tabs and other parts in the battery and polarization resistance generated instantly by loading current, establishing charge and discharge loss index P of the energy storage batterycha、Pdis；
S2, considering direct-current cable loss, low, medium and high-voltage cable loss, PCS (Power distribution System) loss and box transformer substation loss of the energy storage systemEstablishing a loss index P of the energy storage systemsys；
S3, considering internal power supply of the auxiliary system, and establishing an energy storage auxiliary loss index P based on power consumption of the cooling system, the PCS, the BMS and the video monitoring systemaux；
S4, confirming the configuration capacity of the energy storage system according to the power of the grid-connected point of the optical storage station, the discharge duration, whether the auxiliary system is powered by the energy storage system or not and whether the auxiliary system is required to discharge at constant power or not;
in the invention, the energy storage system is a lithium ion battery, the loss caused by connection or electric core inconsistency in the energy storage integration process is not considered, and the DOD of the energy storage system is considered according to 100%.
Specifically, the energy storage capacity configuration method considering the system loss is implemented by the following steps:
in step S1, the charging loss P of the energy storage batterychaAnd discharge loss Pdis：
In the formula: pdisThe power loss of the energy storage battery in the charging process is avoided; pchaThe power loss of the energy storage battery in the discharging process is avoided;
rated ampere hours for one cell;
is the rated operating voltage of one cell;
is the maximum energy capacity of the energy storage system; r is the internal resistance of one cell; k is the polarization resistance of one cell; e is an energy storage systemStored electrical energy; pbatIs the energy storage system power.
In step S2, the system loss of energy storage includes cable loss, PCS loss, and transformer loss:
Psys＝Pcab+Ppcs+Psts
Ppcs＝(1-α)PP
Psts＝(1-β)Ps
wherein: pcabThe line loss from the energy storage system to the grid-connected point; i isDCIs the current flowing through the direct current cable; rDCThe wire resistance of the direct current cable; i isLVACThe current flows through the single-phase low-voltage alternating-current cable; rLVACThe wire resistance of the single-phase low-voltage alternating current cable; i isMVACIs the current flowing through the single-phase medium-voltage alternating-current cable; rMVACIs the line resistance of a single-phase medium-voltage alternating current cable; i isHVACThe current flows through the single-phase high-voltage alternating-current cable; r isHVACThe wire resistance of the single-phase high-voltage alternating-current cable; ppcsPower loss on PCS; p isPThe power input by the direct current side of the PCS is; α is the conversion efficiency of the PCS, α is a constant; pstsIs the power loss on the box transformer; psThe power input for the low-voltage side of the box transformer substation; beta is the conversion efficiency of the box transformer, and beta is a constant.
In step S3, the auxiliary loss P of the energy storage systemauxIncluding cooling system loss, battery monitoring system loss and video monitoring system loss:
wherein: p isauxAuxiliary system power consumption for energy storage; p isbOutputting power for the energy storage container;
the power consumption coefficient of the temperature control system of the energy storage container; xi is the power consumption coefficient of the PCS equipment; epsilon is the power consumption coefficient of the BMS system of the energy storage container; mu is the power consumption coefficient of the video monitoring system of the energy storage container.
In step S4, considering the stationary loss of the battery during transportation, the loss during installation and debugging, and the heat loss due to environmental factors, and setting a redundancy coefficient to cover the battery capacity consumption caused by the above loss, the final capacity of the energy storage system is configured as:
wherein: p isbatThe energy storage system power; ebatThe capacity of the energy storage system to be configured; ppocIs the power requirement of the grid-connected point; h is the discharge duration requirement of the energy storage system; λ is a redundancy coefficient.
The invention considers the internal resistance and the polarization resistance of the energy storage device, and provides an expression of the charging and discharging loss of the energy storage device based on the electrochemical characteristics; meanwhile, the overall loss of the energy storage system is considered, and the loss comprises line loss, PCS loss, box transformer loss, auxiliary power consumption loss and the like. Based on the loss, the requirements of the grid-connected point power requirement of the energy storage power station, the discharge duration of the energy storage, whether the energy storage system is in constant power discharge and the like are considered, and the energy storage system capacity configuration method based on loss calculation is provided. Compared with the traditional energy storage system capacity configuration scheme, the scheme quantifies the charge-discharge loss of the energy storage battery, refines the overall loss link of the energy storage system, can accurately respond to the power grid requirement, effectively configures the capacity of the energy storage system in the energy storage and light storage power station, and ensures the power supply reliability and the power grid stability of the energy storage and light storage power station.
The present invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the energy storage system capacity configuration method steps based on loss calculation as described above.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the energy storage system capacity configuration method steps based on loss calculations as described hereinbefore.
The computer readable storage medium may be any available medium or data storage device that can be accessed by a processor in an electronic device, including but not limited to magnetic memory such as floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc., optical memory such as CDs, DVDs, BDs, HVDs, etc., and semiconductor memory such as ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid State Disks (SSDs), etc.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
The above detailed description is provided to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (3)
1. A capacity configuration method of an energy storage system based on loss calculation is characterized in that: the method is applied to a large-scale energy storage system on a power generation side, and comprises the following steps:
s1, considering ohmic resistance brought by connection of diaphragm resistance, electrode materials, electrolyte, fluid and lugs in the battery and polarization resistance generated instantly by loading current, and establishing a charge-discharge loss index P of the energy storage batterycha、Pdis；
Charging and discharging loss P of energy storage batterycha、PdisRespectively as follows:
wherein: p isdisThe power loss of the energy storage system in the charging process is avoided; pchaThe power loss of the energy storage system in the discharging process is avoided;
rated ampere hours for one cell;
is the rated operating voltage of one cell;
the maximum energy capacity of the energy storage system; r is the internal resistance of one cell; k is the polarization resistance of one cell; e is the electric energy stored by the energy storage system; pbatThe energy storage system power;
s2, considering direct-current cable loss, low, medium and high-voltage cable loss, PCS (Power distribution System) loss and box transformer substation loss of the energy storage system, and establishing an energy storage system loss index Psys；
Psys＝Pcab+Ppcs+Psts (0.3)
Ppcs＝(1-α)PP (0.5)
Psts＝(1-β)Ps (0.6)
Wherein: pcabLine loss from the energy storage system to a grid connection point; i isDCIs the current flowing through the direct current cable; r isDCThe wire resistance of the direct current cable; I.C. ALVACIs the current flowing through the single-phase low-voltage alternating-current cable; r isLVACThe wire resistance is of a single-phase low-voltage alternating-current cable; i isMVACIs the current flowing through the single-phase medium-voltage alternating-current cable; rMVACIs the line resistance of a single-phase medium-voltage alternating current cable; i isHVACThe current flows through the single-phase high-voltage alternating-current cable; r isHVACThe wire resistance is of a single-phase high-voltage alternating-current cable; p ispcsPower loss on PCS; pPThe power input by the direct current side of the PCS is; α is the conversion efficiency of the PCS, α is a constant; pstsIs the power loss on the box transformer; p issFor the low-voltage side of the box transformerThe power of the input; beta is the conversion efficiency of the box transformer substation, and beta is a constant;
s3, considering internal power supply of the auxiliary system, and establishing an energy storage auxiliary loss index P based on power consumption of the cooling system, the PCS, the BMS and the video monitoring systemaux；
Wherein: pauxAuxiliary system power consumption for energy storage; pbOutputting power for the energy storage container;
the energy consumption coefficient of the temperature control system of the energy storage container; xi is the power consumption coefficient of the PCS equipment; epsilon is the power consumption coefficient of the BMS system of the energy storage container; mu is the power consumption coefficient of the video monitoring system of the energy storage container;
s4, confirming the configuration capacity of the energy storage system according to the power and the discharge duration of the grid-connected point of the optical storage station, whether the auxiliary system is powered by the energy storage system or not and whether the auxiliary system is powered by the constant-power discharge requirement or not;
considering the static loss of the battery in the transportation process, the loss in the installation and debugging process and the heat loss generated by environmental factors, and setting a redundancy coefficient to cover the capacity consumption of the storage battery caused by the loss, the final capacity of the energy storage system is configured as follows:
wherein: ebatThe capacity of the energy storage system to be configured; p isbatThe energy storage system power; p ispocThe power requirement of the grid-connected point is met; h is the discharge duration requirement of the energy storage system; λ is a redundancy coefficient.
2. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the processor, when executing the computer program, performs the energy storage system capacity configuration method steps based on loss calculations as claimed in claim 1.
3. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program when executed by a processor realizes the energy storage system capacity configuration method steps based on loss calculations according to claim 1.
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