Industrial and commercial energy storage effect evaluation method for dynamic attenuation of battery and related device

Abstract

The invention discloses an industrial and commercial energy storage effect evaluation method for dynamic attenuation of a battery and a related device, and the method comprises the steps: obtaining an annual battery capacity attenuation curve, and obtaining a battery circulation parameter; according to the battery cycle parameters, the charging and discharging times and the battery capacity attenuation value of each year in the actual battery capacity attenuation process and the total operation year are calculated; and calculating the charging and discharging income of each year according to the charging and discharging times and the battery capacity attenuation value of each year, solving the financial internal return rate of the energy storage system in the operation period in combination with the total operation year, and evaluating the industrial and commercial energy storage effect. According to the method, the lithium ion battery dynamic attenuation algorithm is fused in the industrial and commercial energy storage project effect evaluation process, so that the annual energy storage attenuation and charging and discharging times in the evaluation process can be accurately calculated, and the effect of the whole life cycle of the energy storage project can be more accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the field of new energy storage, and relates to an industrial and commercial energy storage effect evaluation method of battery dynamic attenuation and a related device. Background Art

[0002] At present, energy storage power stations on the industrial and commercial user side have become an important means to improve energy utilization efficiency and optimize power demand response. In these energy storage power stations, the mainstream charging and discharging strategy is valley charging and peak discharging, that is, using low-priced electricity during the off-peak period of the power grid to charge the energy storage equipment, and then discharging during the peak period of the power grid, so as to achieve electricity cost savings and arbitrage between peak and valley electricity prices. Under this strategy, the energy storage power station can achieve a frequency of 2 charges and 2 discharges or 1 charge and 1 discharge per day, depending on the actual electricity demand of the user and the load of the power grid. However, with the operation of the energy storage power station, the rated capacity of the lithium-ion battery will gradually decrease throughout its life cycle as the number of charge and discharge increases and the service life increases, which not only means that the total amount of electricity that the energy storage power station can store is decreasing, but it may also affect its charging and discharging efficiency and response speed.

[0003] In order to evaluate the performance and expected effects of energy storage power stations, battery manufacturers will provide a guaranteed value for annual battery capacity decay, which is simulated by the manufacturer under the conditions of two charges and two discharges per day and 350 days of operation per year. However, in actual use, the number of charges and discharges per day and the number of operating days per year are not completely consistent with the manufacturer's data, which leads to deviations in the evaluation of annual energy storage effects and inconsistencies with reality. At the same time, during the process of capacity decay, the available data each year will change, which will affect the calculation of the effect of energy storage investment.

[0004] In the process of energy storage measurement, most of the existing energy storage measurement methods directly apply the manufacturer's guaranteed value of battery capacity attenuation without making any corrections to the data. Although this approach is simple, it will lead to a large deviation between the effect evaluation and the actual situation. In addition, due to the reduction in energy storage capacity, energy storage power stations may need to charge more frequently to meet the user's electricity needs. However, in the process of effect evaluation, the change in the number of charges per year due to the change in energy storage capacity is not taken into account, and a static model is still used. Therefore, it is necessary to develop a more dynamic and flexible effect evaluation model to more accurately reflect the actual situation of energy storage power stations. Summary of the invention

[0005] The purpose of the present invention is to provide an industrial and commercial energy storage effect evaluation method and related devices for battery dynamic attenuation, so as to solve the problem that the existing evaluation method has deviations due to considering battery dynamic attenuation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for evaluating the industrial and commercial energy storage effect of battery dynamic attenuation, comprising:

[0008] Obtain the annual battery capacity decay curve and obtain the battery cycle parameters;

[0009] According to the battery cycle parameters, calculate the annual charge and discharge times and battery capacity attenuation value and total operating years during the actual battery capacity attenuation process;

[0010] The annual charging and discharging income is calculated based on the annual charging and discharging times and the battery capacity attenuation value. Combined with the total operating years, the financial internal rate of return of the energy storage system during the operation period is obtained to evaluate the effect of industrial and commercial energy storage.

[0011] Furthermore, the battery cycle parameters include the number of charge and discharge cycles per year, the capacity decay value per year, the capacity decay value at the end of the battery life, the rated number of battery cycles and the rated battery charge and discharge depth.

[0012] Furthermore, the actual battery capacity decay includes cycle life decay and calendar life decay:

[0013]

[0014] Among them, the cycle life attenuation value Calendar life decay value S i Indicates the battery capacity decay percentage in the i-th year, T i represents the number of full charge and discharge times in the i-th year, X represents the rated cycle number of the battery, R represents the battery calendar attenuation coefficient, N i Indicates the actual years of use, g t Indicates the actual cycle attenuation index of the battery, g x Indicates the actual cycle attenuation index of the battery, g r Indicates the actual calendar decay index of the battery.

[0015] Furthermore, the calculation method of the annual charge and discharge times and battery capacity attenuation value is:

[0016] Calculate the total discharge amount that the energy storage device needs to discharge at peak electricity prices every day;

[0017] Calculate the total amount of charge that can be charged by the energy storage device during the valley electricity price each day;

[0018] Take the minimum value of the total discharge amount that the energy storage device needs to discharge every day and the total charge amount that the energy storage device can charge, and calculate the total charge and discharge amount for one year;

[0019] Based on the total charge and discharge volume, total battery capacity, and battery discharge depth of each year, combined with the battery attenuation value at the end of each year, the annual charge and discharge times and battery capacity attenuation value are calculated.

[0020] Furthermore, the annual charging income is:

[0021] CS i =Cd i ×P c

[0022] Among them, CS i represents the charging benefit in the i-th year, Cd i represents the total discharge capacity in the i-th year, P c Indicates the charging electricity price;

[0023] Cd i =A×DOD×T i ×(1-S i )

[0024] Among them, A represents the total capacity of the battery, DOD represents the rated battery charge and discharge depth, T i represents the number of charging times in the i-th year, S i Indicates the battery capacity attenuation percentage in the i-th year.

[0025] Furthermore, the annual discharge income is:

[0026] FS i =Fd i ×P f

[0027] Among them, FS i represents the discharge benefit in the i-th year, Fd i represents the total discharge capacity in the i-th year, P f Indicates the discharge electricity price;

[0028] F i =Cd i ×n

[0029] Among them, Cd i represents the total charging capacity in the i-th year, n represents the system efficiency,

[0030] Furthermore, the calculation process of the financial internal rate of return of the energy storage system during the operation period is:

[0031]

[0032] Among them, FIRR represents the financial internal rate of return of the energy storage system during the operation period, FS i represents the discharge benefit in the i-th year, CS i represents the charging benefit in the i-th year, N z represents the total operating years, and Q represents the total investment in the project.

[0033] An industrial and commercial energy storage effect evaluation system for battery dynamic attenuation, comprising:

[0034] An acquisition module, the acquisition module is used to acquire an annual battery capacity decay curve and obtain battery cycle parameters;

[0035] A calculation module, the calculation module is used to calculate the number of charge and discharge times and battery capacity decay value and total operating years in the actual battery capacity decay process according to the battery cycle parameters;

[0036] An evaluation module is used to calculate the annual charge and discharge revenue based on the annual charge and discharge times and the battery capacity attenuation value, and to obtain the financial internal rate of return of the energy storage system during the operation period in combination with the total operating years, so as to evaluate the industrial and commercial energy storage effect.

[0037] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the method are implemented when the processor executes the computer program.

[0038] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method are implemented.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention provides an industrial and commercial energy storage effect evaluation method of dynamic battery attenuation. By obtaining the annual battery capacity attenuation curve, calculating the annual charge and discharge times and battery capacity attenuation value during the actual battery capacity attenuation process, the annual charge and discharge income is obtained, and then combined with the total operating years, the financial internal rate of return of the energy storage system during the operation period is obtained, which can more accurately reflect the attenuation of the battery during actual use, thereby improving the accuracy of the effect evaluation. The present invention integrates the lithium-ion battery dynamic attenuation algorithm into the process of industrial and commercial energy storage project effect evaluation, and can dynamically measure the actual charge and discharge times and battery capacity attenuation value of the energy storage equipment each year, so that the attenuation and charge and discharge times of the energy storage each year in the measurement process can be accurately calculated, and a more accurate energy storage equipment operation cycle is obtained according to the actual attenuation value, and the rate of return is calculated, and then the industrial and commercial energy storage effect is evaluated. Compared with the traditional fixed attenuation method, the accuracy is significantly improved, and the effect of the entire life cycle of the energy storage project can be more accurately evaluated. The problem of inaccurate evaluation of traditional algorithms is solved, which helps investors to make more accurate predictions and plans for the long-term benefits of energy storage projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 This is a flow chart of the industrial and commercial energy storage effect evaluation method of the battery dynamic attenuation of the present invention.

[0043] Figure 2 This is a schematic diagram of the structure of an industrial and commercial energy storage effect evaluation system for battery dynamic attenuation according to a preferred embodiment of the present invention.

[0044] Figure 3 It is a schematic diagram of the structure of an electronic device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0048] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0049] It should be noted that the terminals involved in the embodiments of the present application may include but are not limited to mobile phones, personal digital assistants (PDAs), wireless handheld devices, tablet computers, personal computers (PCs), MP3 players, MP4 players, wearable devices (for example, smart glasses, smart watches, smart bracelets, etc.), smart home devices and other smart devices.

[0050] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0052] See also Figure 1 The present invention provides an industrial and commercial energy storage effect evaluation method of battery dynamic decay, comprising the following steps:

[0053] Step 1: Obtain the annual battery capacity decay curve provided by the lithium-ion battery manufacturer.

[0054] Obtain the annual battery capacity decay curve calculated by the manufacturer from the lithium-ion battery manufacturer. The curve includes the number of charge and discharge times per year T c , annual capacity decay value S ci , capacity attenuation value S at the end of battery life z , the rated number of battery cycles X and the rated battery charge and discharge depth DOD.

[0055] Step 2: Adjust the parameters in the battery capacity attenuation formula according to the annual battery capacity attenuation curve so that the error rate between the simulated curve and the actual curve is less than 0.1%.

[0056] Lithium-ion batteries are nonlinear dynamic time-varying systems. During the cyclic charge and discharge process, complex electrochemical reactions occur inside the battery, which increases the internal resistance and reduces the capacity, resulting in battery life decay. At the same time, as the battery storage time increases, the battery capacity also decreases. Therefore, the battery capacity decay includes the cycle life decay S x and calendar life decay S r .

[0057] According to the actual situation, the number of cycles per year is T i The larger the battery, the x The larger the value, the greater the T i and S xAt the same time, with the advancement of battery technology, the battery rated cycle number X is also increasing. For the same number of cycles, the larger the X value, the higher the battery S x The smaller the X and S x In actual situations, S x With T i g t The power is linearly related, g t The value is a natural number less than 1 and greater than 0. At the same time, S x and (X / g x ) values ​​are linearly related, g x The value of is a positive integer greater than 1. Therefore, the cycle life attenuation value

[0058] Calendar life decay of battery capacity S r It is directly proportional to the actual service life N of the battery. The greater the service life N, the higher the S r The larger the value of r The value of is proportional to (R×N). R is the battery calendar attenuation coefficient, which is between 1% and 2%. r The attenuation of S is not linearly related to the value of (R×N). In actual use, as the number of years N increases, S r Therefore, the calendar life decay value g r A value greater than 1.

[0059] The battery capacity attenuation formula is as follows:

[0060]

[0061] Among them, S i Indicates the battery capacity decay percentage in the i-th year, T i represents the number of full charge and discharge times in the i-th year, X represents the rated cycle number of the battery, R represents the battery calendar attenuation coefficient, N i Indicates the actual years of use, g t Indicates the actual cycle attenuation index of the battery, g x Indicates the actual cycle attenuation index of the battery, g r Indicates the actual calendar decay index of the battery.

[0062] According to the annual battery capacity attenuation value and calculation conditions provided by the battery manufacturer, firstly calculate T i ,X,N i Set it to the same value as the manufacturer, then set R = 0 first, and adjust g according to the attenuation value of the first year provided by the manufacturer. t and g xThe value of S1 is slightly higher than the actual attenuation value. Then, based on experience, the R value is set between 1% and 2%, and g is adjusted. r The value of the battery capacity decay value S1 at the end of the first year is consistent with the decay value S provided by the manufacturer. c1 similar.

[0063] Then according to the manufacturer's attenuation value S in the second year c2 The difference between the calculated battery capacity attenuation value S2 is adjusted g x and g r When S c2 When it is larger than S2, g x and g r Reduce it so that the battery capacity decay value S in the second year i Compared with the attenuation value S provided by the manufacturer c2 similar.

[0064] Based on the difference in attenuation values ​​each year, g x and g r The value of S is adjusted every year. i and S ci When the error rate of g is less than 0.1%, it means that the calculation accuracy has reached the requirement and no longer needs to be calculated. x and g r Make adjustments.

[0065] Determine X, R, and N based on the above calculations i , g t , g x and r The value of , and then calculate the annual charge and discharge times T according to the actual charge and discharge conditions i .

[0066] Step 3: Substitute the actual number of full-capacity charge and discharge cycles into the battery capacity decay formula to obtain the battery decay value at the end of the first year.

[0067] Calculate the total amount of electricity that the energy storage device needs to discharge when the energy storage device discharges at the peak electricity price every day = energy storage device discharge time × power consumption in this time period.

[0068] Calculate the total amount of energy storage equipment that can be charged at the valley electricity price every day = energy storage equipment charging time × (transformer available power - power consumption during this time period).

[0069] Take the minimum value L of the total amount of electricity that the energy storage device needs to discharge and the total amount of charge that the energy storage device can charge when discharging the energy storage device every day. i =

[0070] min (the total amount of electricity that the energy storage device needs to discharge when discharging, and the total amount of electricity that the energy storage device can charge), for all Li Sum

[0071] To calculate the number of full charge and discharge cycles of the energy storage battery in the first year, first calculate the number of charge and discharge cycles at the beginning of the first year based on the fact that the battery has not decayed: divide the total charge and discharge volume L for one year by the product of the total battery capacity A and the battery discharge depth DOD. The DOD value is 0.9. The calculation formula is as follows:

[0072]

[0073] The number of full charge and discharge times T 10 Substitute the value of into the battery capacity attenuation formula to obtain the battery attenuation value s at the end of the first year 11 .

[0074] Calculate the number of full charge and discharge times of the energy storage battery at the end of the first year by dividing the total charge and discharge amount L for one year by the total battery capacity A and the battery discharge depth DOD and (1-battery attenuation value s at the end of the first year) 11 ). The DOD value is 0.9. The calculation formula is as follows:

[0075]

[0076] The battery decays linearly within one year, so the number of battery charge and discharge times in the first year is

[0077] Substitute the battery charge and discharge times T1 in the first year into the battery capacity decay formula to calculate the battery capacity decay percentage S1 at the end of the first year.

[0078] Step 4: In the future, the number of full-capacity charge and discharge times of the current year is calculated based on the battery attenuation value of the previous year, and the number of charge and discharge times of the current year is substituted into the battery capacity attenuation formula to obtain the battery attenuation value at the end of the current year. When the battery attenuation reaches 30%, the year is calculated, which is the operating year of the energy storage project.

[0079] Battery attenuation value s at the beginning of the second year 20 The battery capacity decay percentage S at the end of the first year 11 same.

[0080] Substitute the value of the full charge and discharge times T1 into the battery capacity attenuation formula to obtain the battery attenuation value s at the end of the second year. 21 .

[0081] Find the number of times the energy storage battery is fully charged and discharged at the end of the second year T 21 , divide the total charge and discharge volume L in one year by the total battery capacity A and the battery discharge depth DOD and (1-battery attenuation value S at the end of the second year) 21). The DOD value is 0.9. The calculation formula is as follows:

[0082]

[0083] The battery decays linearly within one year, so the number of battery charge and discharge times in the second year is

[0084] Substitute the battery charge and discharge times T2 in the second year into the battery capacity attenuation formula to calculate the battery capacity attenuation percentage S2 at the end of the second year.

[0085] In this cycle, the number of charge and discharge times T1 and the battery capacity attenuation percentage S2 per year are calculated.

[0086] When calculating S i Equal to the capacity decay value S at the end of battery life z , find the year N at this time z , the loop calculation ends.

[0087] Step 5: Substitute the annual battery attenuation value and total operating years into the rate of return calculation model to calculate the rate of return of the project.

[0088] Calculate the annual charging and discharging benefits:

[0089] The energy storage battery has to pay electricity fees to the grid when charging, so the charging cost is calculated first: the total charging power Cd in the i-th year i = total battery capacity A × DOD × number of charges per year T i ×(1-battery attenuation percentage S in that year i )=A×DOD×T i ×(1-S i );

[0090] Charging income CS in year i i = Total discharge capacity Cd in year i i ×Charging price P c (After tax) = A × DOD × T i ×(1-S i )×P c .

[0091] There will be loss in the process of battery charging and discharging. This loss is called system efficiency.

[0092] The total discharge power Fd in year i is i = Total charge capacity Cd in year i i × system efficiency n;

[0093] The discharge income FS in the i-th year i= Total discharge power Fd in year i i ×Discharge price P f (After tax)

[0094] FS i =Fd i ×P f

[0095] When the energy storage battery is in the last year of operation z When it is not a full year, the charging cost in the last year is: the actual number of operating days in the last year / 365×the complete charging cost in the last year; the discharging income in the last year is: the actual number of operating days in the last year / 365×the complete discharging income in the last year.

[0096] The net cash flow each year during the operation period is revenue minus cost: FS i -CS i .

[0097] The energy storage system is in operation period N z The annual financial internal rate of return FIRR refers to the discount rate when the cumulative present value of net cash flow in each year during the project calculation period is equal to zero. Its expression is:

[0098]

[0099] Among them, Q is the total investment of the project.

[0100] According to the above formula, the financial internal rate of return FIRR can be calculated, and then the effect of industrial and commercial energy storage can be accurately evaluated based on the financial internal rate of return FIRR.

[0101] Another object of the present invention is to provide an industrial and commercial energy storage effect evaluation system for battery dynamic decay of the present invention, such as Figure 2 As shown, an embodiment of the system includes: an acquisition module, a calculation module and an evaluation module.

[0102] An acquisition module, the acquisition module is used to acquire an annual battery capacity decay curve and obtain battery cycle parameters;

[0103] A calculation module, the calculation module is used to calculate the number of charge and discharge times and battery capacity decay value and total operating years in the actual battery capacity decay process according to the battery cycle parameters;

[0104] An evaluation module is used to calculate the annual charge and discharge revenue based on the annual charge and discharge times and the battery capacity attenuation value, and to obtain the financial internal rate of return of the energy storage system during the operation period in combination with the total operating years, so as to evaluate the industrial and commercial energy storage effect.

[0105] It can be understood that the industrial and commercial energy storage effect evaluation system for dynamic battery attenuation provided by the present invention corresponds to the industrial and commercial energy storage effect evaluation method for dynamic battery attenuation provided by the aforementioned embodiments, and the relevant technical features of the industrial and commercial energy storage effect evaluation system for dynamic battery attenuation can refer to the relevant technical features of the industrial and commercial energy storage effect evaluation method for dynamic battery attenuation, which will not be repeated here.

[0106] The third object of the present invention is to provide an electronic device, such as Figure 3 As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the steps of the industrial and commercial energy storage effect evaluation method of battery dynamic decay.

[0107] The industrial and commercial energy storage effect evaluation method of battery dynamic decay comprises the following steps:

[0108] Obtain the annual battery capacity decay curve and obtain the battery cycle parameters;

[0109] According to the battery cycle parameters, calculate the annual charge and discharge times and battery capacity attenuation value and total operating years during the actual battery capacity attenuation process;

[0110] The annual charging and discharging income is calculated based on the annual charging and discharging times and the battery capacity attenuation value. Combined with the total operating years, the financial internal rate of return of the energy storage system during the operation period is obtained to evaluate the effect of industrial and commercial energy storage.

[0111] A fourth object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the industrial and commercial energy storage effect evaluation method for dynamic attenuation of the battery.

[0112] The industrial and commercial energy storage effect evaluation method of battery dynamic decay comprises the following steps:

[0113] Obtain the annual battery capacity decay curve and obtain the battery cycle parameters;

[0114] According to the battery cycle parameters, calculate the annual charge and discharge times and battery capacity attenuation value and total operating years during the actual battery capacity attenuation process;

[0115] The annual charging and discharging income is calculated based on the annual charging and discharging times and the battery capacity attenuation value. Combined with the total operating years, the financial internal rate of return of the energy storage system during the operation period is obtained to evaluate the effect of industrial and commercial energy storage.

[0116] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0117] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0118] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0119] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the industrial and commercial energy storage effect of battery dynamic decay, characterized in that: include: Obtain the annual battery capacity decay curve and obtain the battery cycle parameters; According to the battery cycle parameters, calculate the annual charge and discharge times and battery capacity attenuation value and total operating years during the actual battery capacity attenuation process; The annual charging and discharging income is calculated based on the annual charging and discharging times and the battery capacity attenuation value. Combined with the total operating years, the financial internal rate of return of the energy storage system during the operation period is obtained to evaluate the effect of industrial and commercial energy storage.

2. The method for evaluating the industrial and commercial energy storage effect of battery dynamic decay according to claim 1, characterized in that: The battery cycle parameters include the number of charge and discharge times per year, the capacity decay value per year, the capacity decay value at the end of the battery life, the rated number of battery cycles and the rated battery charge and discharge depth.

3. The industrial and commercial energy storage effect evaluation method of battery dynamic decay according to claim 1 is characterized in that: The actual battery capacity decay includes cycle life decay and calendar life decay: Among them, the cycle life attenuation value Calendar life decay value S i Indicates the battery capacity decay percentage in the i-th year, T i represents the number of full charge and discharge times in the i-th year, X represents the rated cycle number of the battery, R represents the battery calendar attenuation coefficient, N i Indicates the actual years of use, g t Indicates the actual cycle attenuation index of the battery, g x Indicates the actual cycle attenuation index of the battery, g r Indicates the actual calendar decay index of the battery.

4. The method for evaluating the industrial and commercial energy storage effect of battery dynamic decay according to claim 1, characterized in that: The calculation method of the number of charge and discharge times per year and the battery capacity attenuation value is: Calculate the total discharge amount that the energy storage device needs to discharge at peak electricity prices every day; Calculate the total amount of charge that can be charged by the energy storage device during the valley electricity price each day; Take the minimum value of the total discharge amount that the energy storage device needs to discharge every day and the total charge amount that the energy storage device can charge, and calculate the total charge and discharge amount for one year; Based on the total charge and discharge volume, total battery capacity, and battery discharge depth of each year, combined with the battery attenuation value at the end of each year, the annual charge and discharge times and battery capacity attenuation value are calculated.

5. The method for evaluating the industrial and commercial energy storage effect of battery dynamic decay according to claim 1, characterized in that: The annual charging income is: CS i =d i ×P c Among them, CS i represents the charging benefit in the i-th year, d i represents the total discharge capacity in the i-th year, P c Indicates the charging electricity price; d i =A×DOD×T i ×(1-S i ) Among them, A represents the total capacity of the battery, DOD represents the rated battery charge and discharge depth, T i represents the number of charging times in the i-th year, S i Indicates the battery capacity attenuation percentage in the i-th year.

6. The method for evaluating the industrial and commercial energy storage effect of battery dynamic decay according to claim 1, characterized in that: The annual discharge income is: FS i =Fd i ×P f Among them, FS i represents the discharge benefit in the i-th year, Fd i represents the total discharge capacity in the i-th year, P f Indicates the discharge electricity price; Fd i =Cd i ×n Among them, Cd i represents the total charging capacity in the i-th year, n represents the system efficiency, 7. The method for evaluating the industrial and commercial energy storage effect of battery dynamic decay according to claim 1, characterized in that: The calculation process of the financial internal rate of return of the energy storage system during the operation period is: Among them, FIRR represents the financial internal rate of return of the energy storage system during the operation period, FS i represents the discharge benefit in the i-th year, CS i represents the charging benefit in the i-th year, N z represents the total operating years, and Q represents the total investment in the project.

8. An industrial and commercial energy storage effect evaluation system for battery dynamic decay, characterized in that: include: An acquisition module, the acquisition module is used to acquire an annual battery capacity decay curve and obtain battery cycle parameters; A calculation module, the calculation module is used to calculate the number of charge and discharge times and battery capacity decay value and total operating years in the actual battery capacity decay process according to the battery cycle parameters; An evaluation module is used to calculate the annual charge and discharge revenue based on the annual charge and discharge times and the battery capacity attenuation value, and to obtain the financial internal rate of return of the energy storage system during the operation period in combination with the total operating years, so as to evaluate the industrial and commercial energy storage effect.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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