A distributed compressed air energy storage system and turbine power generation control method thereof

Abstract

An embodiment of the present invention provides a distributed compressed air energy storage system and a turbine power generation control method thereof, which relate to the field of energy storage technology. In the embodiment of the present invention, after determining the gas releasing tank, the balanced throttling pressure difference Pti is used as the target to find the gas receiving tank to meet the preset conditions, instead of directly releasing the gas in the gas releasing tank to the remaining gas storage tanks or the atmosphere in the conventional technology. This method of first determining the gas receiving tank and then operating the turbine can make full use of the air residual pressure of the distributed compressed air energy storage system during the energy release process to improve the power generation efficiency of the system. On this basis, the number of switching times of the turbine between different storage tanks during the energy release process of the distributed compressed air energy storage system can also be greatly reduced, thereby reducing the difficulty of turbine control and helping to promote the engineering application of distributed compressed air energy storage systems.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a distributed compressed air energy storage system and a turbine power generation control method thereof. Background Art

[0002] With the diversification of energy supply and demand, integrated energy systems will be a key vehicle for future energy utilization. Energy storage technology is a crucial means of improving the operational stability of renewable energy power systems and promoting the integration and interactive transformation of multiple energy sources. By integrating energy storage into integrated energy systems, fluctuations in renewable energy output can be effectively mitigated, increasing renewable energy penetration and overall energy utilization.

[0003] Distributed compressed air energy storage systems utilize a single-stage compressor relay boosting compression mode, achieving system miniaturization and increasing energy storage density. This allows for flexible deployment across multiple regions and applications, making it an ideal energy storage technology for integrated energy systems. However, this single-stage compressor relay boosting compression method also means that the distributed compressed air energy storage system's gas storage subsystem consists of multiple gas tanks with varying gas pressures, which significantly complicates turbine control. Frequent switching between different pressure tanks during energy release is a common problem, making turbine control difficult. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a distributed compressed air energy storage system and a turbine power generation control method thereof, which can fully utilize the air residual pressure of the distributed compressed air energy storage system during the energy release process to improve the system's power generation efficiency. On this basis, it can also greatly reduce the number of times the turbine switches between different storage tanks during the energy release process of the distributed compressed air energy storage system, thereby reducing the difficulty of turbine control and helping to promote the engineering application of distributed compressed air energy storage systems.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a distributed compressed air energy storage system turbine power generation control method, comprising:

[0007] Multiple gas storage tanks are numbered from 1 to n according to pressure from small to large to form a number set;

[0008] From the numbered set, set tank i as the gas release tank and mark its pressure as Pi, wherein tank i is traversed sequentially starting from tank n;

[0009] From the numbered set, set tank j as the gas receiving tank and mark its pressure as Pj, wherein tank j is traversed sequentially starting from tank n, and the balanced throttling pressure difference Pti between tanks i and j meets the preset condition;

[0010] Complete the turbine between the gas release tank and the gas receiving tank;

[0011] Among them, the equilibrium throttling pressure difference Pti between tank No. i and tank No. j is determined by the pressure of tank No. i and the pressure of tank No. j.

[0012] In an optional embodiment, the step of setting tank j as a gas receiving tank includes:

[0013] The j-number tank with the preset pressure next to Pi is the preset tank, and its pressure is marked as Pj;

[0014] Calculate the equilibrium throttling pressure difference Pti between tanks i and j;

[0015] If the balanced throttling pressure difference Pti between tanks i and j meets the preset conditions, the preset tank is set as the gas receiving tank;

[0016] If the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, set j=j-1 and repeat the above steps.

[0017] In an optional embodiment, the step of calculating the equilibrium throttling pressure difference Pti between tanks i and j includes:

[0018] Calculate the balanced throttling pressure difference Pti according to the following formula:

[0019] Pti=(Pi×Vi+Pj×Vj) / (b×Vj+Vi);

[0020] Among them, Vi is the gas storage volume of tank i, Vj is the gas storage volume of tank j, and b is the turbine ratio.

[0021] In an optional embodiment, the preset conditions include: Pi>Pti and Pti×b>Pj.

[0022] In an optional embodiment, after the step of calculating the equilibrium throttling pressure difference Pti between tanks i and j, the method further comprises:

[0023] If the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is greater than 1, then set i = i-1 and repeat the calculation steps;

[0024] If the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is equal to 1, tank i is removed from the numbering set and the numbering step is repeated.

[0025] In an optional embodiment, after the step of numbering the n gas storage tanks from 1 to n according to pressure from small to large, the method further includes:

[0026] If the pressures of the n gas storage tanks are all less than or equal to the minimum throttling pressure Pm, the turbine process is terminated.

[0027] In an optional embodiment, after completing the step of generating a turbine between the gas releasing tank and the gas receiving tank, the method further comprises:

[0028] If j is greater than 1, set j = j-1 and repeat the calculation steps;

[0029] If j is equal to 1 and i is greater than 1, set i = i - 1 and repeat the steps of setting the preset tank;

[0030] If j is equal to 1 and i is equal to 1, then the tank No. i is turbined to below the minimum throttling pressure Pm, the tank No. i is removed from the numbering set, and the numbering step is repeated.

[0031] In an alternative embodiment, the step of turbineing tank i to below the minimum throttling pressure Pm comprises:

[0032] The air stored in tank i is turbined to the outside at the throttling pressure Pt;

[0033] Among them, throttling pressure Pt = Pa / b, Pa is the ambient pressure, and b is the turbine ratio.

[0034] In a second aspect, the present invention provides a distributed compressed air energy storage system, which is suitable for the distributed compressed air energy storage system turbine power generation control method as described in any one of the aforementioned embodiments, wherein the distributed compressed air energy storage system includes a single-stage turbine and multiple air storage tanks, and the multiple air storage tanks form a circulation loop with the single-stage turbine. One of the multiple air storage tanks supplies air to the inlet of the single-stage turbine. After the air enters the single-stage turbine and performs work, it is selectively injected into the air storage tank or discharged to the outside.

[0035] In an optional embodiment, the distributed compressed air energy storage system further includes a single-stage compressor, which forms a circulation loop with the plurality of air storage tanks for compressing the air and then injecting the air into one of the air storage tanks.

[0036] The beneficial effects of the embodiments of the present invention include, for example:

[0037] The distributed energy storage system and turbine power generation control method provided by the present invention first number multiple gas storage pipes, numbering them from 1 to n according to pressure from small to large to form a number set, then setting tank i from the number set as the gas release tank, and traversing tank i in sequence starting from tank n, and then setting tank j from the number set as the gas receiving tank, and traversing tank j in sequence starting from tank n, and the balanced throttling pressure difference Pti between tank i and tank j meets the preset conditions, and finally completing the turbine between the gas release tank and the gas receiving tank to realize turbine power generation. That is to say, after determining the gas-releasing tank, the embodiment of the present invention uses the balanced throttling pressure difference Pti that meets the preset conditions as the target to find the gas-receiving tank, rather than directly releasing the gas from the gas-releasing tank into the remaining gas storage tanks or the atmosphere as in conventional technology. This method of first determining the gas-receiving tank and then performing turbine operation can fully utilize the air residual pressure of the distributed compressed air energy storage system during the energy release process to improve the system's power generation efficiency. On this basis, it can also significantly reduce the number of times the turbine switches between different storage tanks during the energy release process of the distributed compressed air energy storage system, thereby reducing the difficulty of turbine control and helping to promote the engineering application of distributed compressed air energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic structural diagram of a distributed compressed air energy storage system provided in an embodiment of the present invention;

[0040] Figure 2 A block diagram of the steps of a turbine power generation control method for a distributed compressed air energy storage system provided by an embodiment of the present invention;

[0041] Figure 3 A logic block diagram of a turbine power generation control method for a distributed compressed air energy storage system provided in an embodiment of the present invention.

[0042] Icons: 100-distributed compressed air energy storage system; 110-single-stage turbine; 130-single-stage compressor; 150-air storage tank; 170-switch unit; 180-heat exchanger; 190-heat storage tank. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only 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 herein can be arranged and designed in various different configurations.

[0044] 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 as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0048] As disclosed in the background technology, the distributed compressed air energy storage system in the prior art adopts a compression mode of relay boosting by a single-stage compressor, which achieves an increase in energy storage density. This energy storage method means that the gas storage subsystem of the distributed compressed air energy storage system is composed of multiple gas storage tanks with different gas storage pressures. In the energy release process, the gas storage tank is usually required to release gas to the turbine to drive the turbine to achieve turbine power generation. Usually, the selection of gas release tanks and gas receiving tanks only follows the principle of high to low, that is, simply releasing gas from the high-pressure gas storage tank to the low-pressure gas storage tank or the atmosphere, and driving the turbine to achieve turbine power generation. However, this turbine control method and the disorder of the gas release tanks and gas receiving tanks bring great difficulty to the turbine control of the distributed compressed air energy storage system. There is a common problem that the turbine switches frequently between different pressure tanks during the energy release process, and the turbine control is difficult. At the same time, after multiple turbine cycles, even if there is a pressure difference between the two gas tanks, the pressure difference is not sufficient to achieve effective turbine operation. For example, the turbine time is too short. At this time, turbine control should be stopped in time. However, there is no suitable exit mechanism in the existing technology, which leads to increased internal friction of the system and is not conducive to improving power generation efficiency.

[0049] In order to solve the above problems, the present invention provides a distributed compressed air energy storage system and a turbine power generation control method thereof. It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict. Specific embodiments

[0051] This embodiment provides a distributed compressed air energy storage system and a turbine power generation control method thereof, which can fully utilize the air residual pressure of the distributed compressed air energy storage system during the energy release process to improve the system's power generation efficiency. On this basis, it can also significantly reduce the number of times the turbine switches between different storage tanks during the energy release process of the distributed compressed air energy storage system, thereby reducing the difficulty of turbine control and helping to promote the engineering application of distributed compressed air energy storage systems.

[0052] See also Figure 1 This embodiment provides a distributed compressed air energy storage system 100, which is applicable to the turbine power generation control method of the distributed compressed air energy storage system 100 described below. The distributed compressed air energy storage system 100 includes a single-stage turbine 110, a single-stage compressor 130, and multiple air storage tanks 150. The multiple air storage tanks 150 and the single-stage turbine 110 form a circulation loop. One of the multiple air storage tanks 150 selectively supplies air to the inlet of the single-stage turbine 110. After entering the single-stage turbine 110 and performing turbine work, the air is selectively injected into the air storage tank 150 or discharged to the outside. The single-stage compressor 130 and the multiple air storage tanks 150 form a circulation loop for compressing air and then selectively injecting it into the air storage tank 150.

[0053] Furthermore, the distributed compressed air energy storage system 100 provided in this embodiment also includes a switch unit 170, a heat exchanger 180, and a heat storage tank 190. The single-stage compressor 130 is driven by an electric motor, and the single-stage turbine 110 is connected to a generator, which drives the generator to generate electricity. The heat storage tank 190 includes a cold storage area and a heat storage area, with an insulating piston interposed between the cold and heat storage areas. The heat storage tank 190 is connected to the heat exchanger 180, forming a circulation loop.

[0054] In this embodiment, the number of air storage tanks 150 is 3. Of course, this is just an example, and the number of air storage tanks 150 can also be 4, 5 or 6, etc., which is not limited here. In the energy storage stage, the single-stage compressor 130 is used to compress the air and then inject it into one of the air storage tanks 150. Specifically, the three air storage tanks 150 are respectively connected to the single-stage heat exchanger 180 and the single-stage compressor 130 in sequence, and form a circulation loop. The single-stage compressor 130 is used to compress the air and then inject it into the three air storage tanks 150 respectively. The single-stage compressor 130 increases the air pressure in each air storage tank 150 in sequence by relaying positive pressure until the air in each air storage tank 150 reaches the final air storage pressure. In addition, the air storage pressure of the multiple air storage tanks 150 is unevenly distributed. When the single-stage compressor 130 injects air into the air storage tank 150, the heat exchange medium in the cold storage area absorbs compression heat through the heat exchanger 180 and is stored in the heat storage area, causing the insulation piston to move toward the cold storage area.

[0055] During the energy release phase, the multiple air storage tanks 150 are first numbered 1-n in ascending order of pressure. Then, starting from n, the traversal process selects the release tank with the highest pressure. Once the release tank is identified, a receiver tank is found based on whether the balanced throttling pressure differential Pti satisfies the preset conditions. Once the receiver tank is identified, turbine control is performed. The release tank supplies air to the inlet of the single-stage turbine 110. The air is then injected into the receiver tank after the turbine 110 has operated. During the process of supplying air from the release tank to the single-stage turbine 110, the heat exchange medium in the heat storage area releases its heat of compression through the heat exchanger 180 and is then stored in the energy storage area, causing the thermally insulated piston to move toward the heat storage area.

[0056] Switch unit 170 is connected between heat exchanger 180 and multiple energy storage tanks and controls the selection of the gas release tank and gas receiving tank, as well as the correct release of gas during the turbine operation. It should be noted that switch unit 170 includes multiple valves and bypass lines, enabling different pipeline circuits to be achieved by properly opening and closing specific valves. The multiple valves can be solenoid valves for electronic control.

[0057] Of course, this is only a brief introduction to the distributed compressed air energy storage system 100. Regarding the energy storage and release principles and related structures of the distributed compressed air energy storage system 100, which are not mentioned in this embodiment, please refer to the existing distributed compressed air energy storage system 100 for details.

[0058] See also Figure 2 and Figure 3 This embodiment also provides a method for controlling turbine power generation in a distributed compressed air energy storage system. This method primarily utilizes the aforementioned distributed compressed air energy storage system 100. Assuming the ambient pressure is Pa and the expansion ratio of the single-stage turbine 110 is b, the method provided in this embodiment includes the following steps:

[0059] S1: Number the multiple gas storage tanks 150 from 1 to n according to pressure from small to large to form a number set.

[0060] Specifically, the numbering step can be implemented by a central control computer. The central control computer can connect to pressure gauges installed on the multiple gas storage tanks 150 to directly obtain pressure values, and then number the multiple gas storage tanks 150 in ascending order based on the pressure, with n representing the number of gas storage tanks 150. For example, in this embodiment, the number of gas storage tanks 150 is three, so n = 3. In step S1, the three gas storage tanks 150 need to be numbered in ascending order, with tank 1 representing the gas storage tank 150 with the lowest pressure, tank 2 representing the gas storage tank 150 with medium pressure, and tank 3 representing the gas storage tank 150 with the highest pressure. Of course, this only illustrates the case where there are three gas storage tanks 150. Cases with more gas storage tanks 150 are not listed here.

[0061] It is worth noting that the number set in this embodiment refers to a database formed and stored in the central control computer, which records the numbers of the gas tanks 150 and the corresponding pressure values.

[0062] S2: Set tank i from the number set as the gas release tank and mark its pressure as Pi, where tank i is traversed sequentially starting from tank n.

[0063] Specifically, step S2 is the step of determining the gas release tank. The gas release tank can be selected based on the pressure value. In the first round, tank i=n can be directly selected as the gas release tank, and its pressure is marked as Pi.

[0064] It should be noted that before executing step S2, the method further includes the following steps: determining whether the pressures of the n gas storage tanks 150 are all less than the minimum throttle pressure Pm; if the pressures of the n gas storage tanks 150 are all less than or equal to the minimum throttle pressure Pm, terminating the turbine process; if the pressure of at least one of the n gas storage tanks 150 is above the minimum throttle pressure Pm, continuing with step S2. Specifically, after forming the number set, it is possible to directly determine whether the pressures of the n gas storage tanks 150 are all less than the minimum throttle pressure Pm. If so, terminating the turbine process; if not, continuing with step S2.

[0065] S3: Set tank j from the number set as the gas receiving tank and mark its pressure as Pj, where tank j is traversed sequentially starting from tank n.

[0066] Specifically, the balanced throttling pressure difference Pti between tanks i and j needs to meet a preset condition. Specifically, step S3 is the step of determining the gas receiving tank. The selection of the gas receiving tank can be directly determined based on whether the balanced throttling pressure difference Pti meets the preset condition.

[0067] It should be noted that in this embodiment, tank No. i is traversed in sequence starting from tank No. n, which means that the gas releasing tank is determined starting from tank No. n and is selected in sequence from high to low. Tank No. j is traversed in sequence starting from tank No. n, which also means that the gas receiving tank is determined starting from tank No. n and is selected in sequence from high to low.

[0068] When executing step S3, please refer to the following steps:

[0069] S31: The tank with the pressure next to Pi is preset as the preset tank, and its pressure is marked as Pj, wherein tanks j and n are traversed in sequence.

[0070] Specifically, after the gas release tank is determined in step S2, traversal is started with tank j=n as the preset tank, and the gas storage tank 150 with a pressure second only to Pi is found, set as tank j, and its pressure is marked as Pj.

[0071] S32: Calculate the equilibrium throttling pressure difference Pti between tank No. i and tank No. j.

[0072] Specifically, the calculation process can be completed directly by the central control computer, wherein the balanced throttling pressure difference Pti can be calculated according to the following formula:

[0073] Pti=(Pi×Vi+Pj×Vj) / (b×Vj+Vi);

[0074] Where Vi is the gas storage volume of tank i, Vj is the gas storage volume of tank j, and b is the turbine ratio. Preferably, the gas storage volume of tank 150 is a fixed value that can be directly input into the central control computer and used during calculations. Meanwhile, the turbine ratio is determined by the single-stage turbine 110 and can also be directly input into the central control computer and used during calculations. In other words, the equalizing throttling pressure differential Pti can be determined by the pressure Pi of tank i and the pressure Pj of tank j. This equalizing throttling pressure differential Pti can serve as a criterion for determining whether the pressure differential between tanks i and j is sufficient.

[0075] After calculating the balanced throttle pressure differential Pti, it is necessary to determine whether Pti meets preset conditions, where the preset conditions include: Pi > Pti and Pti × b > Pj. If Pti between tanks i and j meets the preset conditions, the preset tank is set as the air receiving tank and step S4 is continued. If Pti between tanks i and j does not meet the preset conditions, j is set to j = j - 1 and step S32 is repeated.

[0076] Specifically, after step S32, if the balanced throttling pressure difference Pti meets the preset conditions: Pi>Pti and Pti*b>Pj, then the preset tank is set as the air receiving tank, and step S4 is continued. If the balanced throttling pressure difference Pti does not meet the preset conditions, then j=j-1 is set, and the above step S32 is repeated until j=1. If tank j=1 also fails to meet the preset conditions, then i=i-1 is set, and step S2 is re-executed. In other words, if the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is greater than 1, then i=i-1 is set and the calculation step is repeated; if the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is equal to 1, then tank i is turbined to below the minimum throttling pressure Pm, and tank i is removed from the numbering set, and the numbering step is repeated, that is, step S1 is repeated.

[0077] S4: Complete the turbine between the gas release tank and the gas receiving tank.

[0078] Specifically, if and only if the balanced throttling pressure difference Pti between tanks i and j meets the preset conditions, the turbine power generation operation will be performed. After the turbine is completed, the pressure of tanks i and j needs to be updated.

[0079] After completing step S4, it is necessary to judge tank No. j. If j is greater than 1, set j = j-1 and repeat the calculation step, that is, repeat step S32; if j is equal to 1, and i is greater than 1, set i = i-1 and repeat the step of setting the preset tank, that is, repeat step S2, and at this time, tank No. i = i-1 can be directly set as the preset tank without having to start traversing from tank No. n again, thus eliminating the traversal process; if j is equal to 1, and i is equal to 1, then turbine tank No. i to below the minimum throttling pressure Pm, remove tank No. i from the numbering set, and repeat the numbering step, that is, repeat step S1.

[0080] Specifically, when tank i is turbined to below the minimum throttling pressure Pm, the air stored in tank i can be turbined to the outside at the throttling pressure Pt; wherein, throttling pressure Pt = Pa / b, Pa is the ambient pressure, and b is the turbine ratio.

[0081] In summary, the distributed compressed air energy storage system turbine power generation control method provided in this embodiment has the following control process: First, the number n of the distributed compressed air energy storage system's air storage tanks 150 is counted and sorted in ascending order of pressure, resulting in a set of tank numbers 1-n, ranked by pressure. Next, a determination is made as to whether the pressures of all n air storage tanks 150 meet or exceed the minimum throttling pressure Pm. If so, operation is stopped. If not, air storage tank i is selected from the set of tank numbers in descending order of number n-1 as the release tank, and air storage tank j is selected from the set of tank numbers in descending order of number n-1 as the release tank. Assume that, at this point, the air storage pressure of release tank i is Pi and the air storage volume is Vi; the air storage pressure of receiving tank j is Pj and the air storage volume is Vj. The one-time stable turbine pressure Pti of release tank Pi and receiving tank Pj is calculated using the following formula.

[0082] Pti=(Pi×Vi+Pj×Vj) / (b×Vj+Vi);

[0083] After obtaining Pti, determine whether the relationship between Pi, Pj, and Pti satisfies Pi>Pti and Pti×b>Pj. If not, select gas tank j=j-1 as the receiving tank and perform a one-time determination to stabilize the turbine pressure alongside gas release tank i. This process continues until all tanks have been traversed. If satisfied, complete the turbine cycle based on the throttling pressure, and sequentially update the gas storage pressures of gas release tank Pi and gas receiver Pj. Then, select gas tank j=j-1 as the receiving tank and perform a one-time determination to stabilize the turbine pressure alongside gas release tank i. This process continues until all tanks have been traversed. If gas receiver j is 1, first determine whether the change in gas release tank is 1. If i is not 1, select gas tank i=i-1 as the gas release tank and re-determine the pressures of both gas release tanks and gas tank 150. If i is 1, the air in the i-th tank will be turbined to the outside, and its throttling pressure Pti will be calculated using the following formula. After the turbine is completed in this link, the i-th tank 150 will be removed from the numbered set of the tanks 150, and the numbered set of the tanks 150 will be updated. The one with the largest number will be selected to continue the storage and release judgment.

[0084] Pti=Pa / b;

[0085] In summary, the distributed compressed air energy storage system and its turbine power generation control method provided in this embodiment first number multiple gas storage pipes, numbering them from 1 to n according to pressure from small to large to form a number set, and then set tank i from the number set as the gas release tank, and tank i is traversed in sequence starting from tank n, and then set tank j from the number set as the gas receiving tank, and tank j is also traversed in sequence starting from tank n, and the balanced throttling pressure difference Pti between tanks i and j meets the preset conditions, and finally completes the turbine between the gas release tank and the gas receiving tank to realize turbine power generation. That is, after determining the release tank, the embodiment of the present invention uses the balanced throttling pressure difference Pti to meet the preset conditions to find the receiver tank, rather than directly releasing the gas from the release tank to the remaining gas storage tanks 150 or to the atmosphere as in conventional technologies. This method of first determining the receiver tank and then performing turbine operation can fully utilize the air residual pressure of the distributed compressed air energy storage system during the energy release process, improving the system's power generation efficiency. On this basis, it can also significantly reduce the number of turbine switches between different storage tanks during the energy release process of the distributed compressed air energy storage system, thereby reducing the difficulty of turbine control and helping to promote the engineering application of distributed compressed air energy storage systems. At the same time, this control method can minimize the number of turbine switches between different storage tanks and reduce the control difficulty through a reasonable gas release tank and gas receiving tank screening strategy, as well as the calculation of the throttling pressure of the gas release tank and gas receiving tank. In addition, it can fully utilize the turbine pressure difference between different storage tanks to achieve cascade utilization of the pressure of the gas storage tank 150, thereby improving the power generation efficiency of the distributed compressed air energy storage system and further promoting the engineering application of the distributed compressed air energy storage system 100.

[0086] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A distributed compressed air energy storage system turbine power generation control method, characterized in that: include: After each round of turbine operation, multiple gas storage tanks are numbered from 1 to n according to pressure from small to large to form a number set; From the number set, set tank No. i as the gas release tank and mark its pressure as Pi, wherein tank No. i is traversed sequentially starting from tank No. n; From the number set, set tank j as the gas receiving tank and mark its pressure as Pj, wherein tank j is traversed sequentially starting from n, and the balanced throttling pressure difference Pti between tank i and tank j meets the preset condition; Complete the turbine between the gas release tank and the gas receiving tank; Among them, the balanced throttling pressure difference Pti between tank No. i and tank No. j is determined by the pressure of tank No. i and the pressure of tank No. j, and the balanced throttling pressure difference is used to characterize the pressure difference between the gas releasing tank and the gas receiving tank.

2. The distributed compressed air energy storage system turbine power generation control method according to claim 1, characterized in that: The steps for setting tank j as the gas receiving tank include: The j-number tank with the preset pressure next to Pi is the preset tank, and its pressure is marked as Pj; Calculate the balanced throttling pressure difference Pti between tanks i and j; If the balanced throttling pressure difference Pti between tank No. i and tank No. j meets the preset condition, the preset tank is set as the gas receiving tank; If the balanced throttling pressure difference Pti between tank No. i and tank No. j does not meet the preset condition, set j=j-1 and repeat the step of setting the predetermined tank.

3. The distributed compressed air energy storage system turbine power generation control method according to claim 2, characterized in that: The steps for calculating the balanced throttling pressure difference Pti between tanks i and j include: Calculate the balanced throttling pressure difference Pti according to the following formula: Pti=(Pi×Vi+Pj×Vj) / (b×Vj+Vi); Among them, Vi is the gas storage volume of tank No. i, Vj is the gas storage volume of tank No. j, and b is the turbine ratio.

4. The distributed compressed air energy storage system turbine power generation control method according to claim 3 is characterized in that: The preset conditions include: Pi>Pti and Pti×b>Pj.

5. The distributed compressed air energy storage system turbine power generation control method according to claim 2, characterized in that: After the step of calculating the balanced throttling pressure difference Pti between tank No. i and tank No. j, the method further comprises: If the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is greater than 1, then set i=i-1 and repeat the calculation steps; If the balanced throttling pressure difference Pti between tanks i and j does not meet the preset conditions, and j is equal to 1 and i is equal to 1, tank i will be throttled to below the minimum throttling pressure Pm, and tank i will be removed from the numbering set and the numbering step will be repeated.

6. The distributed compressed air energy storage system turbine power generation control method according to claim 2, characterized in that: After the step of numbering the n gas storage tanks from 1 to n according to pressure from small to large, the method further includes: If the pressures of the n gas storage tanks are all less than or equal to the minimum throttling pressure Pm, the turbine process is terminated.

7. The distributed compressed air energy storage system turbine power generation control method according to claim 2, characterized in that: After completing the step of turbine between the gas release tank and the gas receiving tank, the method further comprises: If j is greater than 1, set j = j-1 and repeat the calculation steps; If j is equal to 1, and i is greater than 1, then set i=i-1 and repeat the step of setting the preset tank; If j is equal to 1 and i is equal to 1, the i-th tank is turbined to below the minimum throttling pressure Pm, the i-th tank is removed from the numbering set, and the numbering step is repeated.

8. The distributed compressed air energy storage system turbine power generation control method according to claim 7, characterized in that: The steps of turbineing tank i to below the minimum throttling pressure Pm include: The air stored in tank i is turbined to the outside at the throttling pressure Pt; Among them, throttling pressure Pt = Pa / b, Pa is the ambient pressure, and b is the turbine ratio.

9. A distributed compressed air energy storage system, applicable to the distributed compressed air energy storage system turbine power generation control method according to any one of claims 1 to 8, characterized in that: The distributed compressed air energy storage system includes a single-stage turbine and multiple air storage tanks. The multiple air storage tanks form a circulation loop with the single-stage turbine. One of the multiple air storage tanks supplies air to the inlet of the single-stage turbine. After the air enters the single-stage turbine and performs work, it is injected into the air storage tank or discharged to the outside.

10. The distributed compressed air energy storage system according to claim 9, characterized in that: The distributed compressed air energy storage system also includes a single-stage compressor, which forms a circulation loop with the multiple air storage tanks and is used to compress the air and then selectively inject it into the air storage tank.

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