Compressed air energy storage system host model selection matching method, medium and equipment

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage system host model selection matching method, medium and equipment, and the method comprises the steps: determining input parameters used for compressed air energy storage system host model selection matching; calculating the total resistance of a pipeline from an air compressor outlet to an air reservoir inlet by adopting input parameters; calculating the total resistance of the pipeline from the outlet of the gas reservoir to the inlet of the turbine by adopting input parameters; heat storage temperature is set in a grading mode; setting an initial cycle number; setting a temporary heat storage temperature; calculating the total air flow required by power generation of the turbine by adopting the input parameters; calculating the average power of the air compressor by adopting the input parameters; the energy storage unit efficiency is calculated through the input parameters and the average power of the air compressors; and a matching combination with the highest efficiency is obtained. According to the method, the matching of the host parameters is more accurate, the host capacity can be accurately matched, the unit efficiency is improved, and the problem that improper matching is easily caused by the host type selection matching method of the compressed air energy storage unit system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a method for selecting and matching a host of a compressed air energy storage system, a medium, and equipment. Background Art

[0002] Compressed air energy storage power generation technology is a high-density, long-life, high-efficiency, and flexible physical energy storage technology that can enhance the grid's peak-shaving capacity and improve the reliability of its power supply. However, compressed air energy storage units are complex systems. During the energy storage process, the air compressor outlet pressure gradually increases, and the air compressor is constantly operating under variable conditions. During the power generation process, the turbine inlet pressure gradually decreases, and the turbine is also constantly operating under variable conditions. Therefore, main engine matching is relatively difficult. Traditional main engine matching is based on manual experience, which is often prone to misjudgment or improper matching. If the matching is not done properly, it will result in low unit efficiency and wasted main engine capacity.

[0003] In summary, there is an urgent need for a selection and matching method that can accurately match the host capacity to solve the problems existing in the existing technology. Summary of the Invention

[0004] The present invention aims to provide a method, medium, and device for selecting and matching the main engine of a compressed air energy storage system, so as to solve the problem that the main engine selection and matching method of the compressed air energy storage unit system in the prior art is prone to improper matching, thereby leading to the technical problem of low efficiency of the compressed air energy storage unit. The specific technical solution is as follows: The present invention provides a method for selecting and matching a host of a compressed air energy storage system, comprising the following steps: S1. Determine the input parameters used for host selection and matching of the compressed air energy storage system; S2. Calculate the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet using the input parameters; S3. Calculate the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet using the input parameters; S4. Setting the heat storage temperature by levels, specifically, setting 、 、......、 as the heat storage temperature; S5. Set the initial cycle number: m = 1; S6. Set temporary heat storage temperature ; S7, calculating the 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. 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 reservoir inlet; S9. Calculate the efficiency of the energy storage unit using the input parameters and the average power of the air compressor ; 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; S11. Compare , ...... , select the maximum value among them, that is, the matching combination with the highest efficiency.

[0005] A further improvement of the main engine selection and matching method for the compressed air energy storage system of the present invention lies in that the specific steps of S2 are as follows: The height difference between the outlet of the air compressor and the inlet of the air storage tank ≥0, then the total resistance of the pipeline from the outlet of the air compressor to the inlet of the air storage tank The calculation formula is as follows: ; The height difference between the outlet of the air compressor and the inlet of the air storage tank<000004​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The calculation formula is as follows: ; in, Indicates the total length of the pipeline from the gas reservoir outlet to the turbine inlet; It represents the resistance coefficient along the pipeline from the turbine outlet to the gas reservoir inlet; It represents the local resistance coefficient of the pipeline from the gas reservoir outlet to the turbine inlet; Indicates the height difference between the gas reservoir outlet and the turbine inlet; Indicates the air flow rate at the gas reservoir outlet; Indicates the diameter of the pipe from the gas reservoir outlet to the turbine inlet.

[0007] A further improvement of the method for selecting and matching a host machine of a compressed air energy storage system of the present invention is that S7 includes the following steps: Calculate the maximum operating pressure of the turbine : ; Calculate the minimum operating pressure of the turbine : ; Calculate turbine operating temperature : ; in, Indicates the maximum working pressure of the gas reservoir; Indicates the minimum working pressure of the gas reservoir. Indicates the turbine side heater terminal difference.

[0008] A further improvement of the method for selecting and matching a host of a compressed air energy storage system of the present invention is that S7 further includes the following steps: From large to small, that is, from the highest working pressure of the turbine To the minimum operating pressure of the turbine , divided equally into 10~30 values, 、 、 、……、 ,and , ; Isentropic specific enthalpy drop under pressure Calculate as follows: ; Where K represents the air adiabatic index, represents the specific heat capacity of air at constant pressure, Indicates the annual average atmospheric pressure at the project location; Turbine inlet flow rate under pressure , calculated according to the following formula: ; in, represents the mechanical efficiency of the turbine, represents the generator efficiency, Indicates the total power generated by the turbine; Calculate by analogy 、 、……、 、 、……、 ; Total air flow required for turbine power generation The calculation formula is as follows: ; in, Indicates the turbine operating time.

[0009] A further improvement of the method for selecting and matching a host of a compressed air energy storage system of the present invention is that S8 includes the following steps: Calculate the maximum working pressure of the air compressor outlet : ; Calculate the minimum operating pressure at the outlet of the air compressor : ; Calculate air compressor outlet flow : ; in, Indicates the air compressor operating time.

[0010] A further improvement of the method for selecting and matching a host of a compressed air energy storage system of the present invention is that S8 further includes the following steps: From large to small, that is, from the highest working pressure at the outlet of the air compressor Minimum working pressure at air compressor outlet , divided equally into 10~30 values, 、 、 、……、 ,and , ; calculate Unit gas lift of air compressor under pressure : ; in, represents the air gas constant, represents the average annual atmospheric temperature at the project site; calculate Unit gas input power of air compressor under pressure : ; in, Indicates the mechanical efficiency of the air compressor, Indicates the efficiency of the motor supporting the air compressor; Calculate by analogy 、 、……、 Unit gas input power of air compressor under pressure 、 、……、 ; Average power per unit gas of air compressor The calculation formula is as follows: .

[0011] The further improvement of the host selection and matching method of the compressed air energy storage system of the present invention is that the efficiency of the energy storage unit The calculation formula is as follows: .

[0012] The present invention also provides a readable storage medium, which stores a computer program. The computer program is suitable for being loaded by a processor and executing the above-mentioned compressed air energy storage system host selection and matching method.

[0013] The present invention also provides a computer device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the compressed air energy storage system host selection and matching method as described above is executed.

[0014] The application of the technical solution of the present invention has the following beneficial effects: The host selection and matching method for the compressed air energy storage system of the present invention fully considers the total resistance of the pipeline from the air compressor outlet to the gas reservoir inlet, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet, and the end difference of the turbine side heater, so that the matching of the host parameters is more accurate, and the host capacity can be accurately matched and the unit efficiency is improved. At the same time, multiple levels of heat storage temperature are set, and the corresponding unit efficiency is calculated respectively. Then, the host matching scheme with the highest efficiency is selected as the optimal scheme. This solves 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.

[0015] The present invention calculates the total air volume required for turbine power generation using a step-by-step integration method, fully accounting for the gradual decrease in turbine inlet pressure during power generation and enabling more accurate matching of the air compressor flow rate. The air compressor's average power is calculated using a step-by-step integration method, fully accounting for the gradual increase in compressor outlet pressure during energy storage. This allows for more accurate calculation of the compressor's average power over the energy storage period, thereby accurately calculating the efficiency of the energy storage unit.

[0016] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 It is a flow chart of the host selection and matching method of the compressed air energy storage system of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] See also Figure 1 As shown, a method for selecting and matching a host of a compressed air energy storage system includes the following steps: S1. Determine the input parameters used for the host selection and matching of the compressed air energy storage system; the input parameters include the minimum heat storage temperature , maximum heat storage temperature , minimum working pressure of gas reservoir , Maximum working pressure of gas reservoir , Air compressor running time , turbine operating time , total turbine power generation , Annual average atmospheric temperature at the project site , Annual average atmospheric pressure at the project site , Turbine side heater terminal difference .

[0020] S2. Calculate the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet using the input parameters ; S3. Calculate the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet using the input parameters ; S4. Setting the heat storage temperature by levels, specifically, setting 、 、......、 As the heat storage temperature, at intervals of 0.5 to 3 °C from low to high; among which, = , = ; S5. Set the initial number of cycles: m = 1; S6. Set the temporary heat storage temperature ; S7. Calculate the total air flow required for power generation by the turbine using the input parameters; S8. Calculate the average power of the air compressor using the input parameters; S9. Calculate the efficiency of the energy storage unit using the input parameters and the average power of the air compressor ; 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; S11. Compare , ,..., , select the maximum value among them, that is, the matching combination with the highest efficiency.

[0021] Furthermore, the specific steps of S2 are as follows: If the height difference between the outlet of the air compressor and the inlet of the air storage tank is ≥ 0, the total resistance of the pipeline from the outlet of the air compressor to the inlet of the air storage tank is calculated as follows: ; If the height difference between the outlet of the air compressor and the inlet of the air storage tank is < 0, the total resistance of the pipeline from the outlet of the air compressor to the inlet of the air storage tank is calculated as follows: ; Among which, represents the total length of the pipeline from the outlet of the air compressor to the inlet of the air storage tank; represents the coefficient of frictional resistance along the pipeline from the outlet of the air compressor to the inlet of the air storage tank; represents the coefficient of local resistance of the pipeline from the outlet of the air compressor to the inlet of the air storage tank; represents the height difference between the outlet of the air compressor and the inlet of the air storage tank; represents the highest working pressure of the air storage tank under the air density; represents the air flow velocity at the outlet of the air compressor; represents the acceleration of gravity; represents the diameter of the pipeline from the outlet of the air compressor to the inlet of the air storage tank.

[0022] Furthermore, the specific steps of S3 are as follows: If the height difference between the gas reservoir outlet and the turbine inlet ≥0, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet The calculation formula is as follows: ; If the height difference between the gas reservoir outlet and the turbine inlet <0, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet The calculation formula is as follows: ; in, Indicates the total length of the pipeline from the gas reservoir outlet to the turbine inlet; It represents the resistance coefficient along the pipeline from the turbine outlet to the gas reservoir inlet; It represents the local resistance coefficient of the pipeline from the gas reservoir outlet to the turbine inlet; Indicates the height difference between the gas reservoir outlet and the turbine inlet; Indicates the air flow rate at the gas reservoir outlet; Indicates the diameter of the pipe from the gas reservoir outlet to the turbine inlet.

[0023] Specifically, S7 includes the following steps: Calculate the maximum operating pressure of the turbine : ; Calculate the minimum operating pressure of the turbine : ; Calculate turbine operating temperature : ; in, Indicates the maximum working pressure of the gas reservoir; Indicates the minimum working pressure of the gas reservoir. Indicates the turbine side heater terminal difference.

[0024] From large to small, that is, from the highest working pressure of the turbine To the minimum working pressure of the turbine , divided equally into 10~30 values, 、 、 、……、 ,and , ; Isentropic specific enthalpy drop under pressure Calculate as follows: ; Where K represents the air adiabatic index, represents the specific heat capacity of air at constant pressure, Indicates the annual average atmospheric pressure at the project location; Turbine inlet flow rate under pressure , calculated according to the following formula: ; in, Indicates mechanical efficiency, with a value range of 0.95~0.995; Indicates generator efficiency, ranging from 0.95 to 0.995; Indicates the total power generated by the turbine.

[0025] Calculate by analogy 、 、……、 、 、……、 ; Total air flow required for turbine power generation The calculation formula is as follows: ; Specifically, S8 includes the following steps: Calculate the maximum working pressure of the air compressor outlet : ; Calculate the minimum operating pressure at the outlet of the air compressor : ; Calculate air compressor outlet flow : .

[0026] From large to small, that is, from the highest working pressure at the outlet of the air compressor Minimum working pressure at air compressor outlet , divided equally into 10~30 values, 、 、 、……、 ,and , ; calculate Unit gas lift of air compressor under pressure : ; in, represents the air gas constant, represents the average annual atmospheric temperature at the project site; calculate Unit gas input power of air compressor under pressure : ; in, Indicates Wk mechanical efficiency, ranging from 0.95 to 0.995; Indicates the efficiency of the air compressor's matching motor, ranging from 0.95 to 0.995.

[0027] Calculate by analogy 、 、……、 Unit gas input power of air compressor under pressure 、 、……、 .

[0028] Average power per unit gas of air compressor The calculation formula is as follows: ; Furthermore, the efficiency of the energy storage unit The calculation formula is as follows: .

[0029] The present invention also provides a readable storage medium, which stores a computer program. The computer program is suitable for being loaded by a processor and executing the above-mentioned compressed air energy storage system host selection and matching method.

[0030] The present invention also provides a computer device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the compressed air energy storage system host selection and matching method as described above is executed.

[0031] The host selection and matching method for the compressed air energy storage system of the present invention fully considers the total resistance of the pipeline from the air compressor outlet to the gas reservoir inlet, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet, and the end difference of the turbine side heater, so that the matching of the host parameters is more accurate, and the host capacity can be accurately matched and the unit efficiency is improved. At the same time, multiple levels of heat storage temperature are set, and the corresponding unit efficiency is calculated respectively. Then, the host matching scheme with the highest efficiency is selected as the optimal scheme. This solves 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.

[0032] The present invention calculates the total air volume required for turbine power generation using a step-by-step integration method, fully accounting for the gradual decrease in turbine inlet pressure during power generation and enabling more accurate matching of the air compressor flow rate. The air compressor's average power is calculated using a step-by-step integration method, fully accounting for the gradual increase in compressor outlet pressure during energy storage. This allows for more accurate calculation of the compressor's average power over the energy storage period, thereby accurately calculating the efficiency of the energy storage unit.

[0033] The application examples of the present invention are shown in the table below. The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for selecting and matching a host of a compressed air energy storage system, characterized in that: The steps include: S1. Determine the input parameters used for host selection and matching of the compressed air energy storage system; S2. Calculate the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet using the input parameters; S3. Calculate the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet using the input parameters; S4. Setting the heat storage temperature by levels, specifically, setting 、 、......、 as the heat storage temperature; S5. Set the initial cycle number: m = 1; S6. Set temporary heat storage temperature ; S7, calculating the 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. 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 reservoir inlet; S9. Calculate the efficiency of the energy storage unit using input parameters and the average power of the air compressor ; S10, determine the value of m, when m < n, then , return to S6 for loop calculation; when m = n, the loop calculation ends and enters S11; S11, comparison 、 、......、 , select the maximum value, which is the most efficient matching combination.

2. The method for selecting and matching a host of a compressed air energy storage system according to claim 1, wherein: The specific steps of S2 are as follows: Height difference between air compressor outlet and air reservoir inlet ≥0, the total resistance of the pipeline from the air compressor outlet to the air reservoir inlet The calculation formula is as follows: ； Height difference between air compressor outlet and air reservoir inlet <0, the total resistance of the pipeline from the air compressor outlet to the gas reservoir inlet The calculation formula is as follows: ； in, Indicates the total length of the pipeline from the air compressor outlet to the air reservoir inlet; Indicates the layer resistance coefficient of the pipeline from the air compressor outlet to the gas reservoir inlet; Indicates the local resistance coefficient of the pipeline from the air compressor outlet to the air reservoir inlet; Indicates the height difference between the air compressor outlet and the air reservoir inlet; Indicates the air density at the highest working pressure of the gas reservoir; Indicates the air flow rate at the outlet of the air compressor; represents the acceleration due to gravity; Indicates the diameter of the pipe from the air compressor outlet to the air reservoir inlet.

3. The method for selecting and matching a host of a compressed air energy storage system according to claim 2, characterized in that: The specific steps for S3 are as follows: If the height difference between the gas reservoir outlet and the turbine inlet ≥0, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet The calculation formula is as follows: ； If the height difference between the gas reservoir outlet and the turbine inlet <0, the total resistance of the pipeline from the gas reservoir outlet to the turbine inlet The calculation formula is as follows: ； in, Indicates the total length of the pipeline from the gas reservoir outlet to the turbine inlet; It represents the resistance coefficient along the pipeline from the turbine outlet to the gas reservoir inlet; It represents the local resistance coefficient of the pipeline from the gas reservoir outlet to the turbine inlet; Indicates the height difference between the gas reservoir outlet and the turbine inlet; Indicates the air flow rate at the gas reservoir outlet; Indicates the diameter of the pipe from the gas reservoir outlet to the turbine inlet.

4. The method for selecting and matching a host of a compressed air energy storage system according to claim 1, wherein: S7 includes the following steps: Calculate the maximum operating pressure of the turbine : ； Calculate the minimum operating pressure of the turbine : ； Calculate turbine operating temperature : ； in, Indicates the maximum working pressure of the gas reservoir; Indicates the minimum working pressure of the gas reservoir. Indicates the turbine side heater terminal difference.

5. The method for selecting and matching a host of a compressed air energy storage system according to claim 4, characterized in that: S7 also includes the following steps: From large to small, that is, from the highest working pressure of the turbine To the minimum operating pressure of the turbine , divided equally into 10~30 values, 、 、 、……、 ,and , ; Isentropic specific enthalpy drop under pressure Calculate as follows: ； Where K represents the air adiabatic index, represents the specific heat capacity of air at constant pressure, Indicates the annual average atmospheric pressure at the project location; Turbine inlet flow rate under pressure , calculated according to the following formula: ； in, represents the mechanical efficiency of the turbine, represents the generator efficiency, Indicates the total power generated by the turbine; Calculate by analogy 、 、……、 、 、……、 ; Total air flow required for turbine power generation The calculation formula is as follows: ； in, Indicates the turbine operating time.

6. The method for selecting and matching a host of a compressed air energy storage system according to claim 5, characterized in that: S8 includes the following steps: Calculate the maximum working pressure of the air compressor outlet : ； Calculate the minimum operating pressure at the outlet of the air compressor : ； Calculate air compressor outlet flow : ； in, Indicates the air compressor operating time.

7. The method for selecting and matching a host of a compressed air energy storage system according to claim 6, characterized in that: S8 further includes the following steps: From large to small, that is, from the highest working pressure at the outlet of the air compressor Minimum working pressure at air compressor outlet , divided equally into 10~30 values, 、 、 、……、 ,and , ; calculate Unit gas lift of air compressor under pressure : ； in, represents the air gas constant, represents the average annual atmospheric temperature at the project site; calculate Unit gas input power of air compressor under pressure : ； in, Indicates the mechanical efficiency of the air compressor, Indicates the efficiency of the motor supporting the air compressor; Calculate by analogy 、 、……、 Unit gas input power of air compressor under pressure 、 、……、 ; Average power per unit gas of air compressor The calculation formula is as follows: 。 8. The method for selecting and matching a host of a compressed air energy storage system according to claim 7, characterized in that: Energy storage unit efficiency The calculation formula is as follows: 。 9. A readable storage medium, characterized in that The readable storage medium stores a computer program, which is suitable for being loaded by a processor and executing the compressed air energy storage system host selection and matching method according to any one of claims 1 to 8.

10. A computer device, characterized in that: The computer device includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the compressed air energy storage system host selection and matching method according to any one of claims 1 to 8 is executed.

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