Flow pressure control method and related device

Abstract

The invention discloses a flow pressure control method and a related device, and the method comprises the steps: adaptively adjusting an integral coefficient and a proportionality coefficient in an incremental proportional-integral control algorithm in a control process, i.e., the integral coefficient is determined according to a sensitivity gain at a current moment and a difference value at the current moment; the proportion coefficient is determined according to the sensitivity gain at the current moment, the sensitivity gain characterization at the current moment is determined according to fitting of the historical actual flow pressure and the historical frequency of the frequency converter, the situation of excessive adjustment or under-adjustment is avoided, and the self-adaptive integral coefficient and the proportion coefficient can adapt to the pressure attenuation characteristics in the middle and later periods of mining.

Description

Technical Field

[0001] The present invention relates to a flowing pressure control method and related device, belonging to the technical field of coalbed methane drainage production. Background Art

[0002] Bottom-hole pressure, also known as flowing pressure, is a key factor affecting gas production efficiency and downhole stability during the exploitation of coalbed methane (CBM). The current flowing pressure control method is PI control based on fixed parameters, and this control has the following disadvantages: 1. The damping of the conventional control method is not easy to adjust, and it is prone to overshoot, resulting in oscillation, or undershoot, resulting in a long adjustment period; 2. It cannot adapt to the pressure decay characteristics in the middle and late stages of exploitation. Summary of the Invention

[0003] The present invention provides a flowing pressure control method and related device, which solves the problems disclosed in the background art.

[0004] According to one aspect of the present application, a flowing pressure control method is provided, including: Obtaining the actual flowing pressure at the current moment, and calculating the difference between the target flowing pressure at the current moment and the actual flowing pressure at the current moment; According to the difference at the current moment and the difference at the previous moment, an incremental proportional-integral control algorithm is used to obtain the frequency increment of the frequency converter at the current moment; wherein, the frequency converter is the frequency converter driving the pump; in the incremental proportional-integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment; the sensitivity gain at the current moment is characterized by fitting based on the historical actual flowing pressure and the historical frequency of the frequency converter, and the sensitivity characterizes the influence of the frequency change of the frequency converter on the flowing pressure change; According to the frequency of the frequency converter at the previous moment and the frequency increment at the current moment, calculate the frequency of the frequency converter at the current moment, control the frequency converter according to the frequency of the frequency converter at the current moment, and control the flowing pressure through the frequency converter.

[0005] Further, the formula of the incremental proportional-integral control algorithm is: ; In the formula, k is the current moment, k - 1 is the previous moment, Δu(k) is the frequency increment of the frequency converter at the current moment, e(k) and e(k - 1) are respectively the difference at the current moment and the difference at the previous moment, is the proportional coefficient determined according to the sensitivity gain α at the current moment, is the integral coefficient determined according to the sensitivity gain α at the current moment and the difference at the current moment.

[0006] Further, the formula of the proportional coefficient determined according to the sensitivity gain α at the current moment is: ; In the formula, K p is the initially set proportionality coefficient.

[0007] Furthermore, the integral coefficient determined according to the sensitivity gain α at the current moment and the difference at the current moment, the formula is: ; In the formula, is the integral coefficient determined according to the sensitivity gain α at the current moment, β is the damping factor, T e is the threshold, K I is the initially set integral coefficient.

[0008] Furthermore, the sensitivity gain at the current moment is determined by fitting the historical actual flow pressure and the historical frequency of the frequency converter, including: According to the historical actual flow pressure and the historical frequency of the frequency converter, a relationship model between the flow pressure and the frequency of the frequency converter is fitted, and the absolute value of the parameter representing the influence of the change in the frequency of the frequency converter on the change in the flow pressure in the relationship model is used as the sensitivity at the current moment, and the ratio of the sensitivity at the current moment to the sensitivity reference value is used as the sensitivity gain at the current moment.

[0009] Furthermore, the relationship model between the flow pressure and the frequency of the frequency converter is: ; In the formula, p is the flow pressure, t is the time, u is the frequency of the frequency converter, a, b and c are parameters, and b is the parameter representing the influence of the change in the frequency of the frequency converter on the change in the flow pressure.

[0010] Furthermore, by using the incremental proportional-integral control algorithm, the frequency increment at the current moment of the frequency converter obtained is the initial frequency increment at the current moment of the frequency converter. After obtaining the initial frequency increment at the current moment of the frequency converter, the final frequency increment at the current moment of the frequency converter is also determined according to the frequency increment upper limit and the initial frequency increment at the current moment of the frequency converter, the formula is: ; In the formula, k is the current moment, is the final frequency increment at the current moment of the frequency converter, Δu 1 (k) is the initial frequency increment at the current moment of the frequency converter, Δu max is the frequency increment upper limit.

[0011] Furthermore, according to the frequency of the frequency converter at the previous moment and the frequency increment at the current moment, the frequency at the current moment of the frequency converter calculated is the initial frequency at the current moment of the frequency converter. After obtaining the initial frequency at the current moment of the frequency converter, the final frequency at the current moment of the frequency converter is also determined according to the frequency upper limit and the initial frequency at the current moment of the frequency converter, the formula is: ; where k is the current moment, is the final frequency of the frequency converter at the current moment, u(k) is the initial frequency of the frequency converter at the current moment, and u max is the upper frequency limit.

[0012] According to another aspect of the present application, a flow pressure control device is provided, which is characterized by including: A difference module that obtains the actual flow pressure at the current moment and calculates the difference between the target flow pressure at the current moment and the actual flow pressure at the current moment; An increment module that, according to the difference at the current moment and the difference at the previous moment, adopts an incremental proportional-integral control algorithm to obtain the frequency increment of the frequency converter at the current moment; wherein, the frequency converter is the frequency converter that drives the pump; in the incremental proportional-integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment; the sensitivity gain at the current moment is characterized by being determined by fitting the historical actual flow pressure and the historical frequency of the frequency converter, and the sensitivity characterizes the influence of the frequency change of the frequency converter on the flow pressure change; A control module that calculates the frequency of the frequency converter at the current moment according to the frequency of the frequency converter at the previous moment and the frequency increment at the current moment, controls the frequency converter according to the frequency of the frequency converter at the current moment, and controls the flow pressure through the frequency converter.

[0013] According to another aspect of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores one or more programs, and the one or more programs include instructions that, when executed by a computing device, cause the computing device to execute the flow pressure control method.

[0014] The beneficial effects achieved by the present invention: In the control process of the present invention, the integral coefficient and the proportional coefficient in the incremental proportional-integral control algorithm are adaptively adjusted, that is, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, the proportional coefficient is determined according to the sensitivity gain at the current moment, and the sensitivity gain at the current moment is characterized by being determined by fitting the historical actual flow pressure and the historical frequency of the frequency converter. There will be no over-regulation or under-regulation, and such adaptive integral coefficient and proportional coefficient can adapt to the pressure decay characteristics in the middle and late stages of mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flowchart of the flow pressure control method; Figure 2 is a block diagram of the flow pressure control device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0017] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0018] At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0019] For technologies, methods, and devices known to those of ordinary skill in the relevant art, they may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification.

[0020] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0021] It should be noted that: similar symbols and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0022] The incremental proportional-integral control algorithm achieves precise control by calculating the increment of the control quantity at the current moment and the previous moment. The algorithm is based on the proportional and integral links, which work together to optimize the control effect. The proportional coefficient determines the influence degree of the error on the control increment, and the integral coefficient affects the speed of the integral link to eliminate the steady-state error.

[0023] The embodiment of this application provides a flow pressure control method based on an improved incremental proportional-integral control algorithm. The specific improvement is to achieve the adaptive adjustment of the proportional coefficient and the integral coefficient, and through the adaptive coefficients, implement the constant pressure drop strategy in the process of coalbed methane extraction, ensure the balance of the desorption rate, and avoid affecting the output too fast or too slow. This flow pressure control method can be executed by a flow pressure control device, and this flow pressure control device can be a terminal device or a server. Among them, the terminal device can include, but is not limited to, mobile phones, computers, smart wearable devices, intelligent vehicle-mounted devices, etc., and the embodiment of this application does not make restrictions; the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, big data, and artificial intelligence platforms, etc., and the embodiment of this application does not make restrictions. Optionally, this flow pressure control method can also be executed collaboratively by multiple electronic devices with computing power. For the convenience of description, the subsequent embodiments will be described with the execution by the flow pressure control device.

[0024] See Figure 1 , Figure 1 is a flowchart of a flow pressure control method provided by the embodiment of this application. This flow pressure control method can be executed by a flow pressure control device, and this flow pressure control method can at least include the following steps: Step 1, obtain the actual flow pressure at the current moment, and calculate the difference between the target flow pressure at the current moment and the actual flow pressure at the current moment.

[0025] It should be noted that the actual flow pressure is collected by a downhole pressure gauge; the target flow pressure is the flow pressure set by the customer; specifically, the customer will set the termination flow pressure and the descent rate. For example, at a certain moment, the descent rate is set to 50 kPa / day, and the termination flow pressure is 600 kPa, that is, it is expected to start from the current flow pressure, drop 50 kPa per day, and finally exit the constant pressure drop operation when it drops to 600 kPa.

[0026] Step 2, according to the difference at the current moment and the difference at the previous moment, adopt the incremental proportional-integral control algorithm to obtain the frequency increment of the frequency converter at the current moment; among them, the frequency converter is the frequency converter that drives the pump; in the incremental proportional-integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment; the sensitivity gain at the current moment is characterized by fitting according to the historical actual flow pressure and the historical frequency of the frequency converter, and the sensitivity characterizes the influence of the frequency change of the frequency converter on the flow pressure change.

[0027] It should be noted that the formula of the incremental proportional-integral control algorithm can be expressed as: ; Wherein, k is the current moment, k - 1 is the previous moment, Δu(k) is the frequency increment of the frequency converter at the current moment, e(k) and e(k - 1) are the differences at the current moment and the previous moment respectively, K I is the initially set integral coefficient, K p is the initially set proportionality coefficient.

[0028] It should be noted that K I and K p are for a system corresponding to a special case. Specifically, manual adjustment can be carried out for a certain period of a well arbitrarily (which is the prior art and can be found on the Internet, not described in detail here), and record the K I and K p of this special case.

[0029] Since the influence of the frequency converter frequency on the flowing pressure change is different in different stages of a well and for different wells, it is necessary to construct a relationship model between the flowing pressure and the frequency converter frequency, and define the sensitivity. Adjust the K I and K p under the special case to the coefficients in the general case.

[0030] According to the physical reality, a linear equation can be used as the relationship model, and the formula can be expressed as: ; Wherein, is the change of the flowing pressure, p is the flowing pressure, t is the time, u is the frequency of the frequency converter, a, b, and c are parameters, b is the parameter characterizing the influence of the change of the frequency converter frequency on the change of the flowing pressure, term represents the influence of the flowing pressure itself on the change rate, term represents the influence of the change of the frequency converter frequency on the change of the flowing pressure, and the c term represents the constant term, which can be understood as the influence of environmental factors and initial conditions.

[0031] |b| can be defined as the sensitivity. At different moments, this sensitivity is different. Assuming the current moment is the k moment, then according to the historical actual flowing pressure and the historical frequency of the frequency converter, the relationship model between the flowing pressure and the frequency converter frequency can be fitted (i.e., the above model), and the absolute value of the parameter characterizing the influence of the change of the frequency converter frequency on the change of the flowing pressure in the relationship model is used as the sensitivity at the current moment. The ratio of the sensitivity at the current moment to the sensitivity reference value is used as the sensitivity gain at the current moment; among them, the sensitivity reference value, K I and K p are obtained together, that is, manual adjustment is carried out for a certain period of a well arbitrarily, and record the sensitivity, K I and K p of this special case. The sensitivity of the special case is the sensitivity reference value.

[0032] Based on the sensitivity gain, the proportional coefficient and the integral coefficient can be adjusted. The specific formula can be as follows: ; ; In the formula, is the proportional coefficient determined according to the sensitivity gain α at the current moment, is the integral coefficient determined according to the sensitivity gain α at the current moment.

[0033] In order to correct the damping coefficient of the control, that is, when far from the target, it operates in an underdamped manner, and when approaching the target, it operates in an overdamped manner. Therefore, it is necessary to further correct the integral coefficient. The formula can be as follows: ; In the formula, is the integral coefficient determined according to the sensitivity gain α at the current moment and the difference at the current moment. β is the damping factor, generally 3, and T e is the threshold, generally 40 kPa.

[0034] Therefore, the formula of the incremental proportional-integral control algorithm corresponding to the current moment can be expressed as: ; Through this control, the frequency increment of the frequency converter adapted to the current situation can be obtained.

[0035] Step 3: Calculate the frequency of the frequency converter at the current moment according to the frequency of the frequency converter at the previous moment and the frequency increment at the current moment, control the frequency converter according to the frequency of the frequency converter at the current moment, and control the flow pressure through the frequency converter.

[0036] It should be noted that in order to ensure the stability of the system after control, in some embodiments, an upper limit of the frequency increment and an upper limit of the frequency will be added, that is, the calculated frequency increment is not used as the final frequency increment. As the initial frequency increment of the frequency converter at the current moment, it is also necessary to determine the final frequency increment of the frequency converter at the current moment according to the upper limit of the frequency increment and the initial frequency increment of the frequency converter at the current moment. The formula can be expressed as: ; In the formula, is the final frequency increment of the frequency converter at the current moment, Δu 1 (k) is the initial frequency increment of the frequency converter at the current moment, Δu max is the upper limit of the frequency increment.

[0037] Similarly, the calculated frequency of the frequency converter at the current moment is the initial frequency of the frequency converter at the current moment. It is also necessary to determine the final frequency of the frequency converter at the current moment according to the upper limit of the frequency and the initial frequency of the frequency converter at the current moment. The formula can be expressed as: ; In the formula, is the final frequency of the frequency converter at the current moment, u(k) is the initial frequency of the frequency converter at the current moment, and u max is the upper frequency limit.

[0038] That is, finally, according to control the frequency converter, and control the flow pressure through the frequency converter.

[0039] In the above method, the integral coefficient and the proportional coefficient in the incremental proportional-integral control algorithm are adaptively adjusted during the control process. That is, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment. The sensitivity gain at the current moment is characterized by fitting based on the historical actual flow pressure and the historical frequency of the frequency converter, and there will be no over-regulation or under-regulation. Moreover, this adaptive integral coefficient and proportional coefficient can adapt to the pressure decay characteristics in the middle and late stages of mining.

[0040] Refer to Figure 2 , Figure 2 which is a block diagram of a flow pressure control device provided by an embodiment of the present application. Figure 2 The embodiment of Figure 2 is a virtual device, which can be loaded and executed by a computer device. The computer device may include the above-mentioned flow pressure control device. The difference module obtains the actual flow pressure at the current moment and calculates the difference between the target flow pressure at the current moment and the actual flow pressure at the current moment.

[0041] The increment module obtains the frequency increment of the frequency converter at the current moment by using the incremental proportional-integral control algorithm according to the difference at the current moment and the difference at the previous moment. Among them, the frequency converter is the frequency converter that drives the pump. In the incremental proportional-integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment. The sensitivity gain at the current moment is characterized by fitting based on the historical actual flow pressure and the historical frequency of the frequency converter, and the sensitivity characterizes the influence of the frequency change of the frequency converter on the flow pressure change.

[0042] The control module calculates the frequency of the frequency converter at the current moment according to the frequency of the frequency converter at the previous moment and the frequency increment at the current moment, controls the frequency converter according to the frequency of the frequency converter at the current moment, and controls the flow pressure through the frequency converter.

[0043] During the control process, the above device adaptively adjusts the integral coefficient and proportional coefficient in the incremental proportional-integral control algorithm. That is, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment. The sensitivity gain at the current moment is characterized by fitting based on the historical actual flow pressure and the historical frequency of the frequency converter, and there will be no over-adjustment or under-adjustment. Moreover, this adaptive integral coefficient and proportional coefficient can adapt to the pressure decay characteristics in the middle and late stages of mining.

[0044] This application also relates to a computer-readable storage medium storing one or more programs, and the one or more programs include instructions that, when executed by a computing device, cause the computing device to execute the flow pressure control method.

[0045] This application also relates to a computer device including one or more processors and one or more memories. The one or more programs are stored in the one or more memories and configured to be executed by the one or more processors. The one or more programs include instructions for executing the flow pressure control method.

[0046] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code.

[0047] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0048] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device that implements the specified functions in the process Figure 1One or more processes and / or blocks Figure 1 The functions specified in one or more blocks.

[0049] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 One or more processes and / or blocks Figure 1 The steps of the functions specified in one or more blocks.

[0050] The above are only embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included within the scope of the claims of the present invention pending approval of the application.

Claims

1. A flow pressure control method, characterized in that: include: Obtain the actual flow pressure at the current moment, and calculate the difference between the target flow pressure at the current moment and the actual flow pressure at the current moment; According to the difference between the current moment and the previous moment, an incremental proportional integral control algorithm is adopted to obtain the frequency increment of the frequency converter at the current moment; wherein the frequency converter is a frequency converter driving a pump; In the incremental proportional-integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment; the sensitivity gain representation at the current moment is determined according to the historical actual flow pressure and the inverter historical frequency fitting, and the sensitivity representation is the influence of the inverter frequency change on the flow pressure change; The frequency of the inverter at the previous moment is calculated based on the frequency increment of the inverter at the current moment. The inverter is controlled based on the frequency of the inverter at the current moment, and the flow pressure is controlled by the inverter.

2. The method according to claim 1, characterized in that The formula of the incremental proportional integral control algorithm is: ； In the formula, k is the current moment, k-1 is the previous moment, Δu(k) is the frequency increment of the inverter at the current moment, e(k) and e(k-1) are the difference between the current moment and the previous moment respectively. is the proportional coefficient determined according to the sensitivity gain α at the current moment, The integral coefficient is determined by the sensitivity gain α at the current moment and the difference at the current moment.

3. The method according to claim 1 or 2, characterized in that: The proportional coefficient determined by the sensitivity gain α at the current moment is as follows: ； In the formula, K p is the initial scale factor.

4. The method according to claim 1 or 2, characterized in that: The integral coefficient is determined based on the sensitivity gain α at the current moment and the difference at the current moment. The formula is: ； In the formula, is the integral coefficient determined according to the sensitivity gain α at the current moment, β is the damping factor, T e is the threshold, K I is the initial setting of the integral coefficient.

5. The method according to claim 1, characterized in that The sensitivity gain at the current moment is determined based on the historical actual flow pressure and the historical frequency of the inverter, including: According to the historical actual flow pressure and the historical frequency of the inverter, the relationship model between the flow pressure and the inverter frequency is fitted, and the absolute value of the parameter in the relationship model that characterizes the impact of the inverter frequency change on the flow pressure change is taken as the sensitivity at the current moment, and the ratio of the sensitivity at the current moment to the sensitivity reference value is taken as the sensitivity gain at the current moment.

6. The method according to claim 5, characterized in that The relationship model between flow pressure and inverter frequency is: ； Where p is the flow pressure, t is the time, u is the frequency of the inverter, a, b and c are parameters, and b is the parameter that characterizes the effect of the change in inverter frequency on the change in flow pressure.

7. The method according to claim 1, characterized in that The incremental proportional integral control algorithm is adopted, and the frequency increment of the inverter at the current moment is obtained as the initial frequency increment of the inverter at the current moment. After obtaining the initial frequency increment of the inverter at the current moment, the final frequency increment of the inverter at the current moment is determined according to the upper limit of the frequency increment and the initial frequency increment of the inverter at the current moment. The formula is: ； In the formula, k is the current time, is the final frequency increment of the inverter at the current moment, Δu1(k) is the initial frequency increment of the inverter at the current moment, Δu max The upper limit of the frequency increment.

8. The method according to claim 1, characterized in that According to the frequency of the inverter at the previous moment and the frequency increment at the current moment, the frequency of the inverter at the current moment is calculated as the initial frequency of the inverter at the current moment. After obtaining the initial frequency of the inverter at the current moment, the final frequency of the inverter at the current moment is determined according to the frequency upper limit and the initial frequency of the inverter at the current moment. The formula is: ； In the formula, k is the current time, is the final frequency of the inverter at the current moment, u(k) is the initial frequency of the inverter at the current moment, u max is the upper frequency limit.

9. A flow pressure control device, characterized in that: include: The difference module obtains the actual flow pressure at the current moment and calculates the difference between the target flow pressure at the current moment and the actual flow pressure at the current moment; The incremental module uses an incremental proportional integral control algorithm to obtain the frequency increment of the inverter at the current moment according to the difference between the current moment and the difference between the previous moment; wherein the inverter is a inverter driving a pump; in the incremental proportional integral control algorithm, the integral coefficient is determined according to the sensitivity gain at the current moment and the difference at the current moment, and the proportional coefficient is determined according to the sensitivity gain at the current moment; the sensitivity gain representation at the current moment is determined by fitting the historical actual flow pressure and the inverter historical frequency, and the sensitivity represents the influence of the frequency change of the inverter on the flow pressure change; The control module calculates the frequency of the inverter at the current moment according to the frequency of the inverter at the previous moment and the frequency increment at the current moment, controls the inverter according to the frequency of the inverter at the current moment, and controls the flow pressure through the inverter.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes any one of the methods of claims 1 to 8.

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