A compressed air energy storage system host selection matching method, medium and device

Abstract

The present application relates to compressed air energy storage technology field, specifically to a kind of compressed air energy storage system main selection matching method, medium and equipment, method includes: determining the input parameter used in compressed air energy storage system main selection matching;Using input parameter to calculate air compressor outlet to air reservoir inlet pipeline total resistance;Using input parameter to calculate air reservoir outlet to turbine inlet pipeline total resistance;Heat storage temperature is graded setting;Setting first cycle number;Setting temporary heat storage temperature;Using input parameter to calculate turbine power generation needs total air flow;Using input parameter to calculate the average power of air compressor;Using input parameter and the average power of air compressor to calculate energy storage unit efficiency;Get the highest efficiency matching combination.The present application makes the matching of main parameter more accurate, can accurately match main capacity and improve unit efficiency, solve the problem that compressed air energy storage unit system main selection matching method is easily caused to be improper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage system host selection matching method, medium and equipment. BACKGROUND

[0002] The compressed air energy storage power generation technology is a physical energy storage technology with high density, long service life, high efficiency and flexible layout, which can enhance the peak regulation capacity of the power grid and improve the reliability of power supply of the power grid. However, the compressed air energy storage unit system is complex; during the energy storage process, the outlet pressure of the air compressor gradually increases, and the air compressor is always in variable operating condition; during the power generation process, the inlet pressure of the turbine gradually decreases, and the turbine is also always in variable operating condition, so the host matching is relatively difficult, and the traditional host matching is based on artificial experience, but the artificial experience often has judgment errors or improper matching, which will cause problems such as low unit efficiency and host capacity waste.

[0003] In view of the above, there is an urgent need for a selection and matching method that can accurately match the host capacity to solve the problems in the prior art. SUMMARY

[0004] The present application aims to provide a compressed air energy storage system host selection matching method, medium and equipment to solve the problem that the host selection matching method of the compressed air energy storage unit system in the prior art is prone to improper matching, thereby causing the technical problem of low efficiency of the compressed air energy storage unit, and the specific technical solution is as follows:

[0005] The present application provides a compressed air energy storage system host selection matching method, comprising the following steps:

[0006] S1, determining the input parameters used for compressed air energy storage system host selection matching;

[0007] S2, calculating the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet using the input parameters;

[0008] S3, calculating the total resistance of the pipeline from the air reservoir outlet to the turbine inlet using the input parameters;

[0009] S4, hierarchical setting of the heat storage temperature, specifically, setting , ,......, as the heat storage temperature;

[0010] S5, setting the initial number of cycles: m = 1;

[0011] S6, setting the temporary heat storage temperature ;

[0012] S7. Calculate the total air flow required for the turbine to generate electricity using the input parameters and the total resistance of the pipeline from the air storage tank outlet to the turbine inlet;

[0013] S8. Calculate the average power of the air compressor using the input parameters and the total resistance of the pipeline from the air compressor outlet to the air storage tank inlet;

[0014] S9. Calculate the efficiency of the energy storage unit using the input parameters and the average power of the air compressor ;

[0015] S10. Judge the value of m. When m < n, then , return to S6 for loop calculation; when m = n, the loop calculation ends and enter S11;

[0016] S11. Compare , ,......, , select the maximum value among them, that is, the matching combination with the highest efficiency.

[0017] A further improvement of the host selection and matching method for the compressed air energy storage system of the present invention is that the specific steps of S2 are as follows:

[0018] The height difference between the air compressor outlet and the air storage tank inlet ≥0, then the total resistance of the pipeline from the air compressor outlet to the air storage tank inlet is calculated as follows:

[0019] ;

[0020] The height difference between the air compressor outlet and the air storage tank inlet <0, then the total resistance of the pipeline from the air compressor outlet to the air storage tank inlet is calculated as follows:

[0021] ;

[0022] Among them,<​​​​​​​​​​​​​​​​​A further improvement to the compressed air energy storage system main unit selection and matching method of the present invention is that the specific steps of S3 are as follows:

[0024] If the height difference between the gas storage outlet and the turbine inlet If the resistance is ≥0, then the total resistance of the pipeline from the gas storage outlet to the turbine inlet is ≥0. The calculation formula is as follows:

[0025] ;

[0026] If the height difference between the gas storage outlet and the turbine inlet If the resistance is less than 0, then the total resistance of the pipeline from the gas storage outlet to the turbine inlet is... The calculation formula is as follows:

[0027] ;

[0028] in, This indicates the total length of the pipeline from the gas storage outlet to the turbine inlet; This represents the drag coefficient along the pipeline from the turbine outlet to the gas storage inlet; This represents the local resistance coefficient of the pipeline from the gas storage outlet to the turbine inlet; This indicates the height difference between the gas storage outlet and the turbine inlet; Indicates the air velocity at the gas storage outlet; This indicates the diameter of the pipe from the gas storage outlet to the turbine inlet.

[0029] A further improvement of the compressed air energy storage system main unit selection and matching method of the present invention is that S7 includes the following steps:

[0030] Calculate the maximum working pressure of the turbine :

[0031] ;

[0032] Calculate the minimum operating pressure of the turbine. :

[0033] ;

[0034] Calculate the operating temperature of the turbine :

[0035] ;

[0036] in, This indicates the maximum working pressure of the gas storage facility; This indicates the minimum operating pressure of the gas storage facility. This indicates the temperature difference at the turbine-side heater terminals.

[0037] A further improvement of the compressed air energy storage system main unit selection and matching method of the present invention is that step S7 further includes the following steps:

[0038] Arranged from largest to smallest, that is, from the highest working pressure of the turbine. To the minimum operating pressure of the turbine Divided into 10 to 30 values, , , ... ,and , ;

[0039] Isotropic enthalpy drop under pressure Calculate as follows:

[0040] ;

[0041] Where K represents the air insulation index. This indicates the specific heat capacity of air at constant pressure. This indicates the average annual atmospheric pressure at the project location;

[0042] Flow rate at the turbine inlet under pressure Calculate using the following formula:

[0043] ;

[0044] in, Indicates the mechanical efficiency of a turbine. Indicates generator efficiency. This indicates the total power output of the turbine.

[0045] And so on. , ... , ... ;

[0046] Turbine power generation requires total airflow The calculation formula is as follows:

[0047] ;

[0048] in, This indicates the turbine's running time.

[0049] A further improvement of the compressed air energy storage system host selection and matching method of the present invention is that S8 includes the following steps:

[0050] Calculate the maximum operating pressure at the air compressor outlet. :

[0051] ;

[0052] Calculating the minimum working pressure at the air compressor outlet :

[0053] ;

[0054] Calculating the flow rate at the air compressor outlet :

[0055] ;

[0056] wherein, represents the air compressor operating time.

[0057] The further improvement of the compressed air energy storage system host selection and matching method of the present application is that S8 further comprises the following steps:

[0058] According to the descending order, i.e. from the highest working pressure at the air compressor outlet to the lowest working pressure at the air compressor outlet , it is divided into 10-30 values, , , , …, , and , ;

[0059] Calculating the unit gas lift of the air compressor under the pressure :

[0060] ;

[0061] wherein, represents the air gas constant, represents the annual average atmospheric temperature at the project site;

[0062] Calculating the unit gas input power of the air compressor under the pressure :

[0063] ;

[0064] wherein, represents the mechanical efficiency of the air compressor, represents the efficiency of the air compressor matching motor;

[0065] and so on , , …, Unit gas input power of air compressor under pressure 、 、……、 ;

[0066] Unit gas average power of air compressor The calculation formula of the unit gas average power of the air compressor is as follows:

[0067] .

[0068] The further improvement of the compressed air energy storage system host selection matching method of the application is that the calculation formula of the energy storage unit efficiency The calculation formula of the energy storage unit efficiency is as follows:

[0069] .

[0070] The application further provides a readable storage medium, which stores a computer program, and the computer program is suitable for being loaded and executed by a processor to implement the compressed air energy storage system host selection matching method as described above.

[0071] The application further provides a computer device, which comprises a memory and a processor, and the memory stores a computer program, and the computer program is executed by the processor to implement the compressed air energy storage system host selection matching method as described above.

[0072] The technical scheme of the application has the following beneficial effects:

[0073] The compressed air energy storage system host selection matching method of the application fully considers the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet, the total resistance of the pipeline from the air reservoir outlet to the turbine inlet, and the side heater end difference of the turbine, so that the matching of the host parameters is more accurate, the host capacity can be accurately matched, and the unit efficiency is improved; meanwhile, multiple heat storage temperatures are set, the corresponding unit efficiencies are calculated, the host matching scheme with the highest efficiency is selected as the optimal scheme, and the problem that the host selection matching method of the compressed air energy storage unit system in the prior art is prone to improper matching is solved.

[0074] The turbine power generation needs total air quantity calculation, and the step-by-step integral method is adopted, the problem that the turbine inlet pressure gradually decreases during power generation is fully considered, and the flow of the air compressor can be more accurately matched; the average power of the air compressor is calculated by using the step-by-step integral method, the problem that the air compressor outlet pressure gradually rises during energy storage is fully considered, the average power of the air compressor during energy storage can be more accurately calculated, and thus the efficiency of the energy storage unit can be accurately calculated.

[0075] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0076] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0077] Figure 1 This is a flowchart of the method for selecting and matching the main unit of the compressed air energy storage system according to the present invention. Detailed Implementation

[0078] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0079] See Figure 1 As shown, a method for selecting and matching the main unit of a compressed air energy storage system includes the following steps:

[0080] S1. Determine the input parameters used for selecting and matching the main unit of the compressed air energy storage system; the input parameters include the minimum heat storage temperature. Maximum thermal storage temperature Minimum working pressure of gas storage Maximum working pressure of gas storage Air compressor running time Turbine running time Total power generation of the turbine The average annual atmospheric temperature at the project location Average annual atmospheric pressure at the project site Turbine side heater terminal difference .

[0081] S2. Calculate the total resistance of the pipeline from the air compressor outlet to the air storage inlet using input parameters. ;

[0082] S3. Calculate the total resistance of the pipeline from the gas storage outlet to the turbine inlet using input parameters. ;

[0083] S4. The graded setting of thermal storage temperature, specifically, is set as follows: , ... As for the heat storage temperature, the intervals from low to high are between 0.5 and 3℃; among them, = , = ;

[0084] S5, set the initial number of cycles: m = 1;

[0085] S6, set the temporary heat storage temperature ;

[0086] S7, calculate the total air flow required for turbine power generation using input parameters;

[0087] S8, calculate the average power of the air compressor using input parameters;

[0088] S9, calculate the energy storage unit efficiency using input parameters and the average power of the air compressor ;

[0089] S10, determine the value of m, when m < n, then , return to S6 for loop calculation; when m = n, the loop calculation is completed, and enter S11;

[0090] S11, compare , , …, , select the maximum value, that is, the highest efficiency matching combination.

[0091] Further, the specific steps of S2 are as follows:

[0092] If the height difference between the air compressor outlet and the air reservoir inlet ≥ 0, then the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet is calculated as follows:

[0093] ;

[0094] If the height difference between the air compressor outlet and the air reservoir inlet < 0, then the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet is calculated as follows:

[0095] ;

[0096] wherein, represents the total pipeline length from the air compressor outlet to the air reservoir inlet; represents the pipeline along the layer resistance coefficient from the air compressor outlet to the air reservoir inlet; represents the local resistance coefficient of the pipeline from the air compressor outlet to the air reservoir inlet; represents the height difference between the air compressor outlet and the air reservoir inlet; represents the air density at the highest working pressure of the air reservoir; represents the air flow rate at the air compressor outlet; represents the acceleration due to gravity; This indicates the diameter of the pipe from the air compressor outlet to the air storage inlet.

[0097] Furthermore, the specific steps of S3 are as follows:

[0098] If the height difference between the gas storage outlet and the turbine inlet If the resistance is ≥0, then the total resistance of the pipeline from the gas storage outlet to the turbine inlet is ≥0. The calculation formula is as follows:

[0099] ;

[0100] If the height difference between the gas storage outlet and the turbine inlet If the resistance is less than 0, then the total resistance of the pipeline from the gas storage outlet to the turbine inlet is... The calculation formula is as follows:

[0101] ;

[0102] in, This indicates the total length of the pipeline from the gas storage outlet to the turbine inlet; This represents the drag coefficient along the pipeline from the turbine outlet to the gas storage inlet; This represents the local resistance coefficient of the pipeline from the gas storage outlet to the turbine inlet; This indicates the height difference between the gas storage outlet and the turbine inlet; Indicates the air velocity at the gas storage outlet; This indicates the diameter of the pipe from the gas storage outlet to the turbine inlet.

[0103] Specifically, S7 includes the following steps:

[0104] Calculate the maximum working pressure of the turbine :

[0105] ;

[0106] Calculate the minimum operating pressure of the turbine :

[0107] ;

[0108] Calculate the operating temperature of the turbine :

[0109] ;

[0110] in, This indicates the maximum working pressure of the gas storage facility; This indicates the minimum operating pressure of the gas storage facility. This indicates the temperature difference at the turbine-side heater terminals.

[0111] The values are divided into 10-30 values from the largest to the smallest, i.e. from the highest working pressure of the turbine to the lowest working pressure of the turbine , , , , , , ;

[0112] The isentropic enthalpy drop under pressure is calculated as follows:

[0113] ;

[0114] wherein K represents the adiabatic index of air, Cp represents the specific heat capacity of air at constant pressure, and P represents the annual average atmospheric pressure at the project site.

[0115] The flow rate at the inlet of the turbine under pressure is calculated as follows:

[0116] ;

[0117] wherein η represents the mechanical efficiency, which is in the range of 0.95-0.995; ηg represents the generator efficiency, which is in the range of 0.95-0.995; P represents the total power generated by the turbine.

[0118] The calculation is continued in the same way , , , , ;

[0119] The total air flow rate required for the power generation of the turbine is calculated as follows:

[0120] ;

[0121] Specifically, S8 comprises the following steps:

[0122] calculating the highest working pressure at the outlet of the air compressor :

[0123] ;

[0124] calculating the lowest working pressure at the outlet of the air compressor : ​

[0125] ;

[0126] Calculate air compressor outlet flow :

[0127] .

[0128] From high to low, that is, from the highest working pressure of the air compressor outlet to the lowest working pressure of the air compressor outlet , divided into 10-30 values, , , , …, , and , ;

[0129] Calculate the unit gas head of the air compressor under pressure :

[0130] ;

[0131] Wherein, R represents the air gas constant, T represents the annual average atmospheric temperature of the project site;

[0132] Calculate the unit gas input power of the air compressor under pressure :

[0133] ;

[0134] Wherein, Wk represents the mechanical efficiency, and the value range is 0.95-0.995; Wm represents the air compressor supporting motor efficiency, and the value range is 0.95-0.995.

[0135] Similarly, calculate , , …, the unit gas input power of the air compressor under pressure , , …, .

[0136] The calculation formula of the unit gas average power of the air compressor is as follows:

[0137] ;

[0138] Further, the energy storage unit efficiency The calculation formula is as follows:

[0139] .

[0140] The application further provides a readable storage medium, which stores a computer program, and the computer program is suitable for being loaded and executed by a processor to perform the compressed air energy storage system host selection and matching method.

[0141] The application further provides a computer device, which comprises a memory and a processor, and the memory stores a computer program, and the computer program is executed by the processor to perform the compressed air energy storage system host selection and matching method.

[0142] The compressed air energy storage system host selection and matching method fully considers the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet, the total resistance of the pipeline from the air reservoir outlet to the turbine inlet, and the turbine side heater end difference, so that the matching of the host parameters is more accurate, the host capacity can be accurately matched, and the unit efficiency is improved, and multiple heat storage temperatures are set, the corresponding unit efficiencies are calculated, and the host matching scheme with the highest efficiency is selected as the optimal scheme, thereby solving the problem that the host selection and matching method of the compressed air energy storage unit system in the prior art is prone to improper matching.

[0143] The turbine power generation needs total air quantity calculation, and the step-by-step integral method is adopted, the problem that the turbine inlet pressure gradually decreases during power generation is fully considered, and the flow of the air compressor can be more accurately matched. The average power of the air compressor is calculated by using the step-by-step integral method, the problem that the air compressor outlet pressure gradually rises during energy storage is fully considered, the average power of the air compressor during energy storage can be more accurately calculated, and the efficiency of the energy storage unit can be accurately calculated.

[0144] The application examples of the application are shown in the following table.

[0145]

[0146] The above only describes the preferred embodiments of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A compressed air energy storage system host selection matching method, characterized in that, The method comprises the following steps: S1, determining input parameters used for matching selection of a compressed air energy storage system host; S2, calculating total resistance of a pipeline from an air compressor outlet to a gas reservoir inlet using the input parameters; S3, calculating total resistance of a pipeline from a gas reservoir outlet to a turbine inlet using the input parameters; S4, the hierarchical setting of the heat storage temperature, specifically, setting 、 、......、 as the heat storage temperature; S5, setting a first cycle number: m = 1; S6, setting temporary heat storage temperature ; S7, calculating total air flow required for turbine power generation using the input parameters and the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet; S8, calculating average power of the air compressor using the input parameters and the total resistance of the pipeline from the air compressor outlet to the gas reservoir inlet; S9, calculate the energy storage unit efficiency using the input parameters and the average power of the air compressor ; S10, judging the value of m, if m < n, then , returning to S6 for loop calculation; if m = n, loop calculation is ended and S11 is entered; S11, contrast , , , select the maximum value, that is, the highest efficiency of the matching combination.

2. The compressed air energy storage system host selection matching method of claim 1, wherein, The specific steps of S2 are as follows: Height difference between air compressor outlet and air reservoir inlet Total resistance of the air compressor outlet to air reservoir inlet piping The calculation formula is as follows: ； Height difference between air compressor outlet and air reservoir inlet <0, then total resistance of air compressor outlet to air reservoir inlet piping is calculated as follows: ； wherein, Lp represents the total piping length from the air compressor outlet to the air reservoir inlet; Cp represents the piping along layer resistance coefficient from the air compressor outlet to the air reservoir inlet; Cp represents the piping along layer resistance coefficient from the air compressor outlet to the air reservoir inlet; H represents the height difference between the air compressor outlet and the air reservoir inlet; p represents the air density at the air reservoir maximum working pressure; V represents the air flow rate at the air compressor outlet; g represents the gravitational acceleration; D represents the piping diameter from the air compressor outlet to the air reservoir inlet.

3. The compressed air energy storage system host selection matching method of claim 2, wherein, The specific steps of S3 are as follows: If the height difference between the gas reservoir outlet and the turbine inlet is ≥ 0, then the total resistance of the gas reservoir outlet to turbine inlet pipe is calculated as follows: ​ ； If the height difference between the gas reservoir outlet and the turbine inlet <0, the total resistance of the gas reservoir outlet to turbine inlet pipeline The calculation formula is as follows: ； wherein, represents the total duct length from the air reservoir outlet to the turbine inlet; represents the duct length from the turbine outlet to the air reservoir inlet; represents the local duct resistance coefficient from the air reservoir outlet to the turbine inlet; represents the height difference between the air reservoir outlet and the turbine inlet; represents the air flow rate at the air reservoir outlet; represents the duct diameter from the air reservoir outlet to the turbine inlet.

4. The compressed air energy storage system host selection matching method of claim 1, wherein, S7 comprises the following steps: Computing the maximum working pressure of a turbomachine : ； Computing minimum operating pressure of a turbomachine : ； Computing turbomachine operating temperature : ； wherein, represents the maximum working pressure of the gas reservoir; represents the minimum working pressure of the gas reservoir, represents the temperature difference at the turbine side heater end.

5. The compressed air energy storage system host sizing and matching method of claim 4, wherein, S7 further comprises the following steps: from largest to smallest, i.e. from highest working pressure of the turbine to lowest working pressure of the turbine , , , , , , ;​ Isentropic specific enthalpy drop under pressure Calculated as follows: ； where K represents the air adiabatic index, represents the air constant pressure specific heat capacity, represents the annual average atmospheric pressure at the project site; Flow at the inlet of the turbine under pressure is calculated by the following equation: ； wherein, represents the turbine mechanical efficiency, represents the generator efficiency, represents the total turbine power generation; and so on , , , , ; The total air flow required for turbine power generation The calculation formula is as follows: ； wherein represents the turbine operating time.

6. The compressed air energy storage system host selection matching method of claim 5, wherein, S8 comprises the following steps: Calculating the air compressor outlet maximum working pressure : ； Calculating air compressor outlet minimum operating pressure : ； Computing air compressor outlet flow : ； wherein, represents the air compressor operating time.

7. The compressed air energy storage system host sizing and matching method of claim 6, wherein, S8 further comprises the following steps: in descending order, i.e. from the highest working pressure at the air compressor outlet to the lowest working pressure at the air compressor outlet , into 10 to 30 values, , , , and , ; Computing Air compressor specific gas head under pressure : ； wherein, represents the air gas constant, represents the annual average atmospheric temperature at the project site; Computing Unit gas input power of an air compressor under pressure : ； wherein, represents the air compressor mechanical efficiency, represents the air compressor motor efficiency; and so on , ,... Specific gas input power of air compressor under pressure , ,... ; Unit gas average power of air compressor The calculation formula is as follows: 。 8. The compressed air energy storage system host sizing and matching method of claim 7, wherein, Energy storage unit efficiency The calculation formula is as follows: 。 9. A readable storage medium, characterized by, The readable storage medium stores a computer program, and the computer program is suitable for being loaded and executed by the processor to perform the compressed air energy storage system host selection matching method according to any one of claims 1-8.

10. A computer device, comprising: The computer device comprises a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to perform the compressed air energy storage system host selection matching method according to any one of claims 1-8.

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