Intelligent joint control method and system for air compressor stations based on cloud-edge collaboration

Abstract

The present invention is applicable to the field of air compressor station control technology, and provides an air compressor station intelligent joint control method and system based on cloud-edge collaboration. The method includes: if the air compressor station is in edge joint control mode, the edge joint control parameters of the air compressor station are obtained from the cloud platform; if the air compressor station is a master station, the air compressor station is put into operation according to the global on / off timing parameters, the operation of the air compressor in the air compressor station is controlled, and the operating parameters of the air compressor station are synchronously sent to other air compressor stations and the cloud platform; if the air compressor station is a slave station, after the master station is put into operation, the investment strategy of the air compressor station is determined according to the type of the air compressor station; the air compressor station is put into operation according to the investment strategy; the operation of the air compressor in the air compressor station is controlled, and the operating parameters of the air compressor station are synchronously sent to other air compressor stations and the cloud platform. The present invention can realize the intelligent joint control of multiple air compressor stations under cloud-edge collaboration, so that the air compressors in the air compressor system are started and stopped on time and on demand, reducing energy costs and enhancing operational stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of air compressor station control, and in particular relates to an intelligent joint control method and system for air compressor stations based on cloud-edge collaboration. Background Art

[0002] An air compression system (or compressed air system) compresses atmospheric-pressure air into high-pressure gas through air compressors, providing power or gas sources for industrial production, construction, medical treatment, and other applications. To meet diverse production needs, modern enterprises generally adopt a multi-station layout for air compression systems. This involves setting up multiple air compression stations within a factory, each equipped with multiple air compressors (a combination of fixed-frequency and variable-frequency equipment).

[0003] In traditional air compression systems, the start and stop of air compressors are greatly affected by human factors, and the air compressor control logic is independent and closed, the air compression stations lack coordination, and the status of the air compression system cannot be perceived in real time, resulting in high energy costs, poor operating stability, low equipment operation and maintenance efficiency, and other problems, affecting the overall operational efficiency of the plant. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides an intelligent joint control method and system for air compressor stations based on cloud-edge collaboration, so as to realize intelligent joint control of multiple air compressor stations under cloud-edge collaboration, so that the air compressors in the air compression system can be started and stopped on time and on demand, thereby reducing energy costs and enhancing operational stability.

[0005] A first aspect of an embodiment of the present invention provides an intelligent joint control method for air compressor stations based on cloud-edge collaboration, the method being applied to each air compressor station in an air compressor system; the air compressor system includes multiple air compressor stations, one of which is a primary station and the remaining air compressor stations are secondary stations;

[0006] The method comprises:

[0007] Determine the control mode of the air compressor station. If the control mode is edge-linked control mode, obtain the edge-linked control parameters of the air compressor station from the cloud platform. The edge-linked control parameters include: global power-on and power-off timing parameters, the air compressors participating in edge-linked control of the air compressor station, and the order of adding and subtracting air compressors;

[0008] Determine whether the air compressor station is the master station. If so, activate the air compressor station according to the global on / off timing parameters. Control the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station, and synchronously send the operating parameters of the air compressor station to other air compressor stations and the cloud platform.

[0009] If this air compressor station is a secondary station, then after the main station is put into operation, the investment strategy of this air compressor station is determined according to the type of this air compressor station; this air compressor station is put into operation according to the investment strategy; according to the main pipe pressure of this air compressor station and the order of air compressors and adders and subtracters participating in the edge joint control of this air compressor station, the operation of the air compressor in this air compressor station is controlled, and the operating parameters of this air compressor station are synchronously sent to other air compressor stations and the cloud platform.

[0010] In a possible implementation, for an air compression station whose terminal is connected to a large gas consumption device, the operating parameters include: the operating status of the large gas consumption device;

[0011] The method further comprises:

[0012] If the air compressor station is the master station, the upper and lower limits of the main pipe pressure are set according to the operating status of all large-gas-consuming equipment, and the upper and lower limits of the main pipe pressure are sent to other air compressor stations;

[0013] If this air compressor station is a slave station, it will receive the upper and lower limits of the main pipe pressure sent by the master station and set them.

[0014] In one possible implementation, setting the upper and lower limits of the main pipe pressure according to the operating status of all large gas-consuming equipment includes:

[0015] If all large gas consumption equipment is in the off state and the duration reaches the first preset time threshold, the upper and lower limits of the main pipe pressure are set to the low position; otherwise, the upper and lower limits of the main pipe pressure are set to the high position;

[0016] The upper limit value of the high digit is greater than the upper limit value of the low digit, and the lower limit value of the high digit is greater than the lower limit value of the low digit.

[0017] In one possible implementation, controlling the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station includes:

[0018] Determine the relationship between the main pipe pressure of the air compressor station and the upper and lower limits of the main pipe pressure;

[0019] If the main pipe pressure of the air compressor station is lower than the main pipe pressure lower limit, the air compressors participating in the edge joint control of the air compressor station and the order of adding the air compressors will be delayed in sequence until the main pipe pressure of the air compressor station is between the upper and lower limits of the main pipe pressure; wherein, the delayed start of the air compressor means that each time an air compressor is turned on, it is delayed to determine whether the main pipe pressure is between the upper and lower limits of the main pipe pressure;

[0020] If the main pipe pressure of this air compressor station is greater than the upper limit of the main pipe pressure, the air compressors will be shut down in sequence according to the air compressors participating in the edge joint control of this air compressor station and the order of reducing the machines, until the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure; wherein, the delayed shutdown of the air compressor is to delay the judgment of whether the main pipe pressure is between the upper and lower limits of the main pipe pressure each time an air compressor is shut down.

[0021] In one possible implementation, shutting down the air compressors in sequence according to the air compressors participating in the edge joint control of the air compressor station and the order of adding the compressors until the main pipe pressure of the air compressor station is between the upper and lower limits of the main pipe pressure includes:

[0022] If the air compressor that needs to be shut down is a fixed-frequency air compressor, unload the fixed-frequency air compressor first;

[0023] Continuously monitoring the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure within a second preset time threshold after the fixed-frequency air compressor is unloaded;

[0024] If the main pipe pressure is greater than the main pipe pressure lower limit within the second preset time threshold, the fixed-frequency air compressor is turned off; otherwise, the fixed-frequency air compressor is reloaded.

[0025] In a possible implementation, before sequentially delaying the start of the air compressors, the method further includes:

[0026] If the air compressor station is dedicated to large-volume gas equipment, then the terminal flow rate is used to determine whether the large-volume gas equipment corresponding to the air compressor station is turned on;

[0027] If the corresponding large gas consumption equipment has been turned on, all the air compressors will be turned on in sequence without delay according to the air compressors participating in the edge joint control of this air compressor station and the order of adding the air compressors.

[0028] In one possible implementation, controlling the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station further includes:

[0029] Determine the relationship between the main pipe pressure of the air compressor station and the upper and lower limits of the main pipe pressure;

[0030] If the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure, and there are variable frequency air compressors in this air compressor station whose power and flow are both less than the corresponding preset thresholds, the variable frequency air compressors will be shut down in sequence with delayed shutdown according to the order in which they are reduced, until the main pipe pressure will be less than the lower limit of the main pipe pressure if the next variable frequency air compressor is shut down, or all the variable frequency air compressors are shut down, and then the shutdown will stop.

[0031] In a possible implementation, if the air compressor station is a secondary station, determining the investment strategy of the air compressor station according to the type of the air compressor station includes:

[0032] If the type of the air compressor station is a standby station, it is determined whether the main pipe pressure of the air compressor station is less than the lower limit of the main pipe pressure within the preset time after the main station is put into operation; if the main pipe pressure of the air compressor station is less than the lower limit of the main pipe pressure, the air compressor station is put into operation;

[0033] If the air compressor station is a dedicated station for large-volume gas equipment, after the main station is put into operation, it is determined whether the large-volume gas equipment corresponding to the air compressor station is turned on; if the large-volume gas equipment is turned on, the air compressor station is put into operation; if the large-volume gas equipment is not turned on, the air compressor station is determined to be a regular secondary station;

[0034] If the type of this air compressor station is a conventional slave station, whether to put this air compressor station into operation is determined based on the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure, as well as the preset conventional slave station operation sequence.

[0035] In one possible implementation, the air compressors participating in edge joint control in each air compression station are divided into at least two batches;

[0036] The method further comprises:

[0037] For any air compressor station, obtain the rotation timing information of the air compressor station from the cloud platform;

[0038] According to the rotation timing information, the at least two batches of air compressors are rotated; wherein, the batch of air compressors that are rotated to work participates in the operation control of the air compressors in this air compressor station; the other batches of air compressors that are rotated to rest do not participate in the operation control of the air compressors in this air compressor station.

[0039] A second aspect of an embodiment of the present invention provides an intelligent joint control system for air compressor stations based on cloud-edge collaboration, comprising: a cloud platform and multiple edge controllers;

[0040] The multiple edge controllers are distributed in each air compression station of the air compression system and connected to the cloud platform; the edge controller is used to implement the method as described in the first aspect or any possible implementation method of the first aspect.

[0041] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0042] In the edge joint control mode, the embodiment of the present invention sets the edge joint control parameters of each air compressor station in the air compressor system through the cloud platform, including the global power on / off timing parameters, the air compressors and add / subtract machine sequences of each air compressor station participating in the edge joint control, and establishes the optimal air compressor system operation strategy, so that each air compressor can be started on time and on demand, thereby achieving energy saving and efficiency improvement, and improving the stability of operation and gas supply. On the edge, the main station is put into operation according to the global power on / off timing parameters, and controls the operation of the air compressor in the main station according to the main pipe pressure of the main station and the air compressors and add / subtract machine sequences of the main station participating in the edge joint control, and synchronously sends the operation parameters of the main station to other air compressor stations and the cloud platform; after the secondary station is put into operation at the main station, the input strategy is determined according to the type of the secondary station, and controls the operation of the air compressor in the secondary station according to the main pipe pressure of the secondary station and the air compressors and add / subtract machine sequences of the secondary station participating in the edge joint control, and synchronously sends the operation parameters of the secondary station to other air compressor stations and the cloud platform. The data sharing of each air compressor station serves as a reference for each air compressor station to participate in the joint control start / stop strategy. The cloud platform aggregates various data and intuitively and clearly assists air compression system decision makers in formulating optimal strategies. By modifying parameters and combining them with edge algorithms, it achieves the goals of scientific management, flexible air supply, and reduced energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a structural diagram of the cloud-edge collaborative air compressor station intelligent joint control system provided by an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the implementation process of the cloud-edge collaborative air compressor station intelligent joint control method provided by the embodiment of the present invention. Figure 1 ;

[0046] Figure 3 This is a schematic diagram of the implementation process of the cloud-edge collaborative air compressor station intelligent joint control method provided by the embodiment of the present invention. Figure 2 ;

[0047] Figure 4 This is a schematic diagram of the implementation process of the cloud-edge collaborative air compressor station intelligent joint control method provided by the embodiment of the present invention. Figure 3 ;

[0048] Figure 5 This is a schematic diagram of the implementation process of the cloud-edge collaborative air compressor station intelligent joint control method provided by the embodiment of the present invention. Figure 4 ;

[0049] Figure 6 Schematic diagram of an edge controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0051] In order to illustrate the technical solution of the present invention, specific embodiments are provided below.

[0052] The traditional method involves manually inspecting and starting the air compressor. Understanding the air compressor status is limited to the fault display on the main electricity meter at the air compressor station and the air compressor panel itself. The air compressor starts and stops entirely based on its own pressure, and the number of operating units is large and dispersed, resulting in a lot of unnecessary energy waste, inconvenient operation, slow response, low management efficiency, and non-intuitive system status.

[0053] The embodiment of the present invention provides an intelligent joint control method for air compressor stations based on cloud-edge collaboration. By collecting various operating data of air compressor stations and terminals, it helps managers to establish the optimal air compressor operation strategy as a reference. By setting joint control parameters such as global timed power on and off, upper and lower limit addition and subtraction machines, main and sub stations, and sequential joint control, the air compressor stations can be started on time, on demand, and in rotation, thereby achieving energy saving and efficiency improvement, improving operation and gas supply stability, and extending the service life of the equipment. At the same time, uploading various data to the cloud platform makes the air compressor system intelligent, networked, integrated, and visualized; enables managers to conduct centralized monitoring, measurement, and management, and conduct multi-dimensional dynamic trend analysis of various data; helps managers to grasp the air compressor energy consumption status in real time, analyze the air compressor energy efficiency level, and promptly check for system abnormalities, which plays a positive role in improving management level, improving energy utilization, reducing energy consumption, and optimizing energy utilization methods.

[0054] First, we introduce the application scenario of the embodiment of the present invention, that is, the air compressor station intelligent joint control system based on cloud-edge collaboration. Figure 1 shown.

[0055] A typical air compression system consists of multiple air compression stations. Data is exchanged between these stations using the ModbusTCP communication protocol. In this embodiment, one air compression station is designated as the master station, with the remaining stations designated as slave stations. The master station is the station that is opened first and closed last on a daily basis and is responsible for primary gas production. The master and slave stations can be manually designated. Variables synchronized between stations can only be modified in the master station controller. The slave stations read data via ModbusTCP, enabling global control.

[0056] Each device within the air compression station is connected to the logic controller in the edge control cabinet via a bus or hardwiring. The logic controller can read device status, alarms, data, and other information, and issue commands. The logic controller has various communication interfaces to meet various data exchange requirements. The air compressors within the air compression station support CAN bus interconnection, enabling monitoring of compressor status, alarms, and data, as well as start, stop, and load / unload control. The air compressors can also be controlled via hardwiring using relay electrical signals. The air compression station may also contain a refrigerated dryer. In other words, this embodiment also allows for joint control of the refrigerated dryer, which can be hardwired via relays to enable power on / off control and fault signal reading. Sensors include flow meters and pressure transmitters, which collect pressure and flow data at the main pipe and at the end of the pipeline (pressure transmitters are generally installed at the end of the pipeline. At high-volume locations, such as air cushion vehicles, additional flow meters are installed to monitor daily usage and ensure timely demand). The main pipe data from each air compression station is transmitted to the logic controller, while end-of-pipe data is uploaded to the cloud platform only through the end-of-pipe gateway and master station.

[0057] The logic controller is connected to the touch screen of the cabinet door via ModbusTCP, enabling status monitoring, parameter setting, and equipment control at the edge site.

[0058] All air compressor stations can communicate with the cloud platform through the MQTT protocol, uploading the data of the air compressor system to the cloud in real time. The cloud platform can change parameters and issue instructions.

[0059] The so-called cloud-edge collaboration refers to the aggregation of various data in the cloud, intuitively and clearly assisting air compression system decision makers to come up with the optimal strategy, and then by modifying parameters and combining it with the control algorithm in the edge controller, to achieve intelligent joint control of multiple air compression stations, realize scientific management, flexible gas supply, and reduce energy consumption.

[0060] The cloud-edge collaborative air compressor station intelligent joint control system provided in this embodiment can select two control modes in real time, either cloud platform or touch screen, according to actual operating conditions and operational needs. Through relevant settings, four control modes are obtained in the algorithm: edge joint control, cloud remote control, edge standalone, and edge manual. Among them, edge manual control is manual control on the air compressor's local panel, cloud remote control and edge standalone control are manual control on the cloud platform and touch screen, respectively. Edge joint control is the core of multiple air compressor station intelligent joint control algorithms, which automatically control the start and stop of the air compressor through the algorithm in the edge controller through relevant parameter settings on the cloud platform or touch screen.

[0061] Figure 2 This is a schematic diagram of the implementation process of the air compressor station intelligent joint control method based on cloud-edge collaboration provided by an embodiment of the present invention. Figure 2 As shown, the method includes:

[0062] Step S201, determining the control mode of the air compression station.

[0063] In this embodiment, the administrator can set parameters on the cloud platform, and the algorithm will automatically run the corresponding control mode.

[0064] Marginal manual mode, meaning that under special circumstances, all air compressor control modes can be switched to local mode, completely isolating the compressor from the system. In this case, the only control mode available is manual start and stop from the air compressor panel itself. It should be emphasized that marginal manual mode is only used when all air compressors in the station are local.

[0065] For edge stand-alone units, if not all air compressors are locally controlled and the control method in the algorithm is touch screen, then the air compressor to be controlled will be deleted from the linked control devices in the edge linked control mode, and its start and stop can be manually controlled on the touch screen.

[0066] Remote control in the cloud: If the air compressors are not all controlled locally and the control method in the algorithm is the cloud platform, then the air compressor to be controlled will be deleted from the control devices in the edge control mode, and its start and stop can be manually controlled on the cloud.

[0067] Furthermore, the control modes of the air compressor itself are divided into LAN, remote, and local. The LAN is bus control, the remote is relay hard-wired control, and the local is panel manual control.

[0068] The algorithm function includes cloud-edge switching (the cloud platform or edge control cabinet touchscreen only switches the location where commands are issued, while the program algorithms for both are located on the controller) and enabling the linked control function. When cloud is selected and the linked control function is off, the system operates in cloud remote mode. When cloud or edge is selected, the linked control function is enabled, resulting in edge linked control. When edge is selected, the linked control function is disabled, resulting in edge standalone mode. When the compressor control mode is local, the compressor can only be controlled from the compressor panel, which is edge manual mode.

[0069] Step S202: If the control mode is the edge joint control mode, the edge joint control parameters of the air compressor station are obtained from the cloud platform.

[0070] In this embodiment, the cloud platform can be divided into single-station joint control and global joint control. Single-station joint control includes control mode selection and parameter setting (including the air compressors participating in edge joint control and the order of adding and subtracting air compressors at each air compressor station), which can be set separately for each air compressor station. Global joint control includes global power on / off timing parameters. Some parameters can be sent to the master station controller to control other air compressor stations via Modbus TCP.

[0071] Step S203: determine whether the air compression station is the master station.

[0072] In this embodiment, multiple air compressor stations are controlled in a coordinated manner. The master station is activated first in the morning, first during periods of low daily pressure, and last when pressure is high. Furthermore, the operating status of the master station is a necessary criterion for the startup and shutdown of each secondary station (except for stations dedicated to high-gas-consuming equipment). The specific criteria require more detailed definition within the algorithms within each station.

[0073] In step S204, if this air compressor station is the master station, the air compressor station will be put into operation according to the global power on / off timing parameters; according to the main pipe pressure of this air compressor station and the order of the air compressors and adders and subtracters participating in the edge joint control of this air compressor station, the operation of the air compressors in this air compressor station will be controlled, and the operating parameters of this air compressor station will be synchronously sent to other air compressor stations and the cloud platform.

[0074] When this air compressor station is designated as the master station, it will start or stop the entire station according to the global start and stop timing parameters. For example, if it is set to start at 8:00 am and stop at 10:00 pm every day, the master station will execute the start or stop operation at the corresponding time.

[0075] The main pipe is the pipeline connecting multiple air compressors. The main pipe pressure reflects the air supply pressure of the entire air compressor station. Each air compressor station monitors roughly the same main pipe pressure (although some differences may occur due to different monitoring locations). The master station monitors the main pipe pressure in real time and, based on the status of the air compressors participating in the edge control and the order in which they are added or removed, decides whether to start new air compressors (increasing air supply) or stop some air compressors (reducing air supply) to maintain the main pipe pressure within the set range.

[0076] The master station transmits the operating parameters of its own air compressor station to other stations via the communication network in real time. These stations can then make adjustments based on this information, achieving coordinated operation of the entire air compressor system. After the master station sends these operating parameters to the cloud platform, the platform can perform remote monitoring, fault diagnosis, energy consumption analysis, and other operations. Managers can access the cloud platform anytime, anywhere via the internet to understand the operating status of the air compressor stations and make appropriate decisions.

[0077] Step S205: If the air compressor station is a secondary station, after the main station is put into operation, the investment strategy of the air compressor station is determined according to the type of the air compressor station; the air compressor station is put into operation according to the investment strategy; according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station, the operation of the air compressors in the air compressor station is controlled, and the operating parameters of the air compressor station are synchronously sent to other air compressor stations and the cloud platform.

[0078] In this embodiment, the master station assumes core management and coordination of the entire system, while the slave stations collaborate with the master station. Only after the master station is operational will the slave stations initiate subsequent operations according to specific logic. For example, a slave station can develop a startup method and schedule tailored to its type. For example, a regular slave station will be activated when the main line pressure is insufficient to maintain it within a set range. A backup slave station will replace the master station if it fails and becomes inoperable.

[0079] In the edge joint control mode, the embodiment of the present invention sets the edge joint control parameters of each air compressor station in the air compressor system through the cloud platform, including the global power on / off timing parameters, the air compressors and add / subtract machine sequences of each air compressor station participating in the edge joint control, and establishes the optimal air compressor system operation strategy, so that each air compressor can be started on time and on demand, thereby achieving energy saving and efficiency improvement, and improving the stability of operation and gas supply. On the edge, the main station is put into operation according to the global power on / off timing parameters, and controls the operation of the air compressor in the main station according to the main pipe pressure of the main station and the air compressors and add / subtract machine sequences of the main station participating in the edge joint control, and synchronously sends the operation parameters of the main station to other air compressor stations and the cloud platform; after the secondary station is put into operation at the main station, the input strategy is determined according to the type of the secondary station, and controls the operation of the air compressor in the secondary station according to the main pipe pressure of the secondary station and the air compressors and add / subtract machine sequences of the secondary station participating in the edge joint control, and synchronously sends the operation parameters of the secondary station to other air compressor stations and the cloud platform. The data sharing of each air compressor station serves as a reference for each air compressor station to participate in the joint control start / stop strategy. The cloud platform aggregates various data and intuitively and clearly assists air compression system decision makers in formulating optimal strategies. By modifying parameters and combining them with edge algorithms, it achieves the goals of scientific management, flexible air supply, and reduced energy consumption.

[0080] Figure 3 This is a detailed flow chart of the air compressor station intelligent joint control method based on cloud-edge collaboration provided by an embodiment of the present invention. Figure 3 , explain this joint control strategy.

[0081] (1) First, the logic controllers of each air compressor station are running. The staff can choose the control method, such as "cloud platform" or "touch screen". When on the cloud computer side, select "cloud platform", and when on site, select "touch screen" to set parameters nearby. Among them, the touch screen is generally used as a backup when the cloud server is offline. Generally, the cloud platform is selected as the control method during operation, which is more convenient and quick.

[0082] (2) The staff can set parameters on the "cloud platform" and set the control mode to edge joint control mode. The parameters here include: global power on / off timing parameters and joint control parameters of each air compressor station.

[0083] The joint control parameters of each air compressor station include but are not limited to:

[0084] The default upper and lower limits for the main pipe are: if the main pipe pressure in a single station is higher than the upper limit, the machine will be reduced; if it is lower than the lower limit, the machine will be added. Based on the overall upper and lower limits, different upper and lower limits and delay times can be set for different air compressors to achieve gradient adjustment of start and stop, and flexibly meet the needs. There is a certain time delay before adding and subtracting the machine to prevent sudden start and stop due to accidental changes in pressure. For the unloading delay time, for fixed-frequency air compressors, it is necessary to control its loading and unloading, and add a certain delay before shutting down after unloading. If the pressure is insufficient during this period, it will be reloaded to effectively prevent the fixed-frequency air compressor from frequently switching on and off in a short period of time.

[0085] Select the list of air compressors in the station that will be added to the joint control. Only the air compressors that have been added to the joint control can execute subsequent steps and participate in the system operation under the control of the joint control algorithm.

[0086] The joint control sequence is set to the order of joint control. The joint control sequence refers to the order of turning on and off the air compressors when the pressure reaches the limit. Generally, it follows the principle of turning on first and then off. Assuming that there are 3 air compressors in a station, when the pressure is lower than the lower limit, the startup sequence is 1#→2#→3#. When the pressure is greater than the upper limit, the shutdown sequence is 3#→2#→1#.

[0087] Other equipment such as cold dryer joint control parameter settings.

[0088] (3) Each air compressor station determines whether it is currently in edge joint control mode.

[0089] In edge-linked control mode, each compressor station must first be enabled for linked control. Only after enabling does the linked control function take effect, and the linked control parameters take effect. Linked control includes setting default upper and lower limits for the main pipe, delay times for adding and removing units, and delay times for unloading units, selecting devices for linked control, setting the linked control sequence (including the switching interval), and setting linked control for the dryer (including early start-up and delayed shutdown times).

[0090] Afterwards, the master station is first put into operation. Specifically, the master station determines the timing of its activation based on the global power-on / off timing parameters. For example, it determines whether the master station's timing is enabled. If the master station's timing function is enabled and the time is within the power-on range, the air compressor is turned on according to the algorithm logic. If the master station's timing function is enabled and the time is within the power-off range, or if the timing function is disabled and the global power-on / off setting is "off," the entire air compressor system should be shut down. Operation A is executed, shutting down the air compressors one by one.

[0091] (4) When the master station is in the startup interval, it can adjust the upper and lower limits of the main pipe pressure according to whether the large gas-consuming equipment at the end is started. For example, it can be judged whether the large gas-consuming equipment at the end of the workshop has been shut down for more than half an hour. If all large gas-consuming equipment are in the shutdown state and the duration reaches half an hour, it means that the large gas-consuming equipment has been used up, and the upper and lower limits of the main pipe pressure of all air compressor stations are set to the low position; otherwise, the upper and lower limits of the main pipe pressure are set to the high position. Among them, the upper and lower limits of the main pipe pressure are the basis for judging the start and stop of the air compressor. Assuming that the low position is 0.62-0.70MPa and the high position is 0.65-0.73MPa, after the large gas-consuming equipment is started, the upper and lower limits are at the high position, and the air compressor station can start faster and shut down slower to meet the gas demand in time. At the same time, due to the discontinuous nature of on-site gas consumption, higher pressure shutdown can also cover a longer gas consumption interval and avoid frequent addition and subtraction of machines.

[0092] (5) Furthermore, the logic controller of each air compressor station determines the input strategy according to whether the air compressor station is the main station and its type.

[0093] (6) If the current mode is not edge joint control, determine whether the air compressor is all local. If all local, use edge manual mode and manually control the air compressor on the air compressor control panel.

[0094] (7) If the air compressor is not all local, further determine whether the system control mode is touch screen control. If it is touch screen control, use the edge stand-alone mode, remove the air compressor from the joint control equipment, and manually control the air compressor on the touch screen.

[0095] (8) If the system control method is not touch screen control, the cloud remote mode is used, the air compressor is removed from the joint control equipment, and the air compressor is manually controlled on the cloud platform.

[0096] like Figure 4 As shown, in this embodiment, after the morning start-up, the main station is put into operation first, and the pressure starts to rise from zero. All the secondary stations will be put into operation after the main station is put into operation, and then the operation strategy will be implemented.

[0097] Exemplary:

[0098] If the type of this air compressor station is a backup station, then it is determined whether the main pipe pressure of this air compressor station is less than the lower limit of the main pipe pressure within the preset time after the main station is put into operation; if the main pipe pressure of this air compressor station is less than the lower limit of the main pipe pressure, then this air compressor station is put into operation. As a backup station, in addition to the judgment of the main station in the morning, a backup judgment is added in parallel with it, that is, it is determined whether the pressure level of the main station is still insufficient after a period of time in the morning. If so, the backup station immediately starts the joint control to meet the gas demand; if not, the judgment continues. Among them, the time and pressure level judgment conditions in the backup judgment can be set relatively loosely. If the judgment is still successful, it means that the main station has a fault and cannot be put into operation normally, resulting in the inability to meet the investment strategies of other secondary stations. At this time, the backup station is immediately put into operation to relieve the gas pressure and ensure the normal investment of other secondary stations.

[0099] If this air compressor station is dedicated to high-volume equipment, after the primary station is commissioned, the terminal flow rate can be used to determine whether the corresponding high-volume equipment is powered on. If the high-volume equipment is powered on, the air compressor station is commissioned. If the high-volume equipment is not powered on, the air compressor station is designated as a conventional secondary station. As a dedicated station for high-volume equipment, the secondary station is commissioned when the high-volume equipment is powered on, and joint control is performed according to the secondary station's adder and subtracter logic to ensure gas consumption for the high-volume equipment. If the high-volume equipment is not powered on, the air compressor station is designated as a conventional secondary station.

[0100] If the type of this air compressor station is a conventional slave station, whether to put this air compressor station into operation is determined based on the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure, as well as the preset order of conventional slave station operation. Conventional slave stations are used as a supplement for daily use. The stations communicate with each other through ModbusTCP to obtain data. In daily use, if the pressure is still insufficient when the main station or standby station is put into operation, the conventional slave stations will be put into operation in turn. Among them, similar to the sequential control logic of the air compressors in the station, the air compressor station is also turned on first and then closed, but when turning on and off the machine, it is necessary to ensure that the first air compressor in the sequence of the main station is at the front of the sequence. As for the start and stop sequence of the air compressor station, more judgment conditions can be set in the algorithm of each station.

[0101] In one embodiment, the structures of the master station and the slave station are similar, so the joint control strategies for the air compressors in the stations are basically the same. Figure 5 Taking the main station as an example, this article introduces the method of controlling the operation of the air compressors in this air compressor station according to the main pipe pressure of this air compressor station and the order of the air compressors and adders and subtractors participating in the edge joint control of this air compressor station.

[0102] (1) If the main pipe pressure of this air compressor station is less than the lower limit of the main pipe pressure, the air compressors participating in the edge joint control of this air compressor station and the order of adding the air compressors will be delayed in sequence until the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure; wherein, the delayed start of the air compressor means that each time an air compressor is turned on, it is delayed to judge whether the main pipe pressure is between the upper and lower limits of the main pipe pressure.

[0103] like Figure 5 As shown, when the number of air compressors currently running is n, the pressure is judged in real time. If the pressure is less than the lower limit and lasts for T n1 If the pressure is insufficient, the third unit, namely, 1#, will be opened.

[0104] If the air compressor station starts up corresponding high-gas-consuming equipment, all air compressors will be started up sequentially without delay based on the air compressors participating in the edge joint control and the order in which they are added. This allows the air compressor station to respond more quickly and meet the gas needs of high-gas-consuming equipment.

[0105] (2) If the main pipe pressure of this air compressor station is greater than the upper limit of the main pipe pressure, the air compressors participating in the edge joint control of this air compressor station and the order of reducing the machines will be delayed in sequence to shut down the air compressors until the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure; among which, the delayed shutdown of the air compressor means that each time an air compressor is shut down, it is delayed to judge whether the main pipe pressure is between the upper and lower limits of the main pipe pressure.

[0106] like Figure 5 As shown, when the number of air compressors currently running is n, the pressure is judged in real time. If the pressure is greater than the upper limit and lasts for T n2 seconds, it is determined whether the current air compressor is fixed frequency. If not, directly shut down the nth unit in the sequence; if so, unload it first, and after unloading, delay for a certain delay time (the second preset time threshold, such as 10 minutes) and continuously monitor the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure. If the main pipe pressure is greater than the lower limit of the main pipe pressure, the fixed frequency air compressor is shut down; otherwise, it means that the pressure is insufficient, and the fixed frequency air compressor is reloaded. This step is mainly used to deal with the situation where the gas consumption suddenly increases when the fixed frequency is in the state of reducing the machine and unloading, causing the main pipe pressure to be lower than the lower limit. At this time, the fixed frequency stops unloading and adds a machine.

[0107] For fixed-frequency air compressors, a delay is added before shutting down after unloading. If the pressure is insufficient during this period, the compressor is reloaded, effectively preventing the fixed-frequency air compressor from frequently turning on and off for a short period of time. In addition, in this embodiment, when a fixed-frequency air compressor is in the unloading state, it is not included in the calculation of the number of air compressors. This ensures that if the pressure continues to exceed the upper limit, the delay after the fixed-frequency unloading will not affect the reduction of air compressors. For example, if the order is 3#2#1#, 1# is fixed-frequency, the current number of running air compressors is 3, and the pressure is higher than the upper limit. After 1# is unloaded, the current number of running air compressors becomes 2. If the pressure is still higher than the upper limit, air compressor 2# can be reduced in time.

[0108] (3) Advanced reduction of machines. For air compressor stations with fixed and variable frequency running at the same time, the pressure may not reach the upper limit, and the variable frequency will start multiple units with low load, making it impossible for the variable frequency air compressor to reach the optimal working condition. At this time, the algorithm shuts down the variable frequency air compressor at the end of the order, which can reduce the number of air compressors in operation and optimize the power consumption conditions. That is: if the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure, and there are variable frequency air compressors in this air compressor station whose power and flow are less than the corresponding preset thresholds, then according to the reduction order of each variable frequency air compressor, the variable frequency air compressors will be shut down in sequence with a delayed timer until the main pipe pressure will be less than the lower limit of the main pipe pressure if the next variable frequency air compressor is shut down, or all variable frequency air compressors are shut down, and then the system stops.

[0109] (4) Error correction algorithm. This embodiment can monitor in real time whether the actually running air compressor is consistent with the preset joint control sequence. If they are consistent, the system will maintain a continuous monitoring state; if there is an inconsistency, the abnormal air compressor will be further tested. When the detection finds that the air compressor is abnormal, it means that it has failed. At this time, an alarm signal will be immediately sent to the cloud platform. The equipment can then be restored to its original state or manual maintenance can be arranged. If the detection shows that the air compressor is in a normal state, it means that it has the conditions for starting. The air compressor will be turned on to restore the actual operating state of the air compressor to the same state as the joint control sequence, thereby ensuring that the air compressors in the station start and stop normally according to the established procedures and maintain stable operation.

[0110] Among them, the reasons for the air compressor to shut down during operation may include fault shutdown, high temperature shutdown, power outage, etc. The actual operating status does not correspond to the air compressor control sequence, resulting in abnormal startup and shutdown. This is because the judgment criteria for air compressor startup and shutdown in the algorithm include the current number of running units. For example: suppose the current sequence is 3#2#1#. If the current running air compressor is 2#, there is no correspondence. At this time, the running number is 1. If the sequence is added, 2# will be added, and if the sequence is reduced, 3# will be reduced, which is impossible. At this time, if 3# is normal, 3# will be turned on in time, and the operating status will be 3#2#, which corresponds to the sequence and can be started and stopped normally.

[0111] (5) This embodiment can also determine whether a certain air compressor is bus controlled. If so, after the state of the air compressor stabilizes, the algorithm instruction is overwritten with a meaningless 16-bit other number; if not, the algorithm instruction is matched with the state of the air compressor. Furthermore, the premise for issuing the 16-bit instruction in the algorithm is that the instruction changes. For the bus-controlled air compressor, overwriting the instruction is to make the instruction modified and effective every time it is issued. Generally, the switch instructions are 16#01 and 16#02, and the loading and unloading instructions are 16#03 and 16#04 (fixed frequency). When not overwritten, assuming that the air compressor stops due to a fault, the air compressor instruction in the algorithm is still the start-up instruction 16#01. If the air compressor recovers, the start-up instruction 16#01 needs to be issued. Because the instruction in the algorithm has not changed, the start-up instruction will not take effect and the air compressor cannot start. If the instruction is overwritten, after the fault stops, the instruction is changed to the meaningless 16#05. At this time, the instruction 16#01 can take effect when the air compressor is restarted.

[0112] Furthermore, for air compressors controlled by hard-wired relays, in remote mode, the air compressor controller terminals will continue to receive electrical signals from the relays, so it is necessary to keep the relay status consistent with the air compressor status. The algorithm determines the change and issuance of instructions in real time based on the current air compressor status and demand, to prevent unexpected starts and stops due to air compressor failure recovery or remote-local switching, which may cause the relay signal to be inconsistent with the operating conditions.

[0113] In some embodiments, the air compressors participating in the edge joint control in each air compression station are divided into at least two batches; the method may further include:

[0114] For any air compressor station, obtain the rotation timing information of the air compressor station from the cloud platform;

[0115] According to the rotation timing information, at least two batches of air compressors are rotated; among them, the batch of air compressors rotated to work participates in the operation control of the air compressors in this air compressor station; the other batches of air compressors rotated to rest do not participate in the operation control of the air compressors in this air compressor station.

[0116] For example, a certain number of air compressors added to the joint control are selected as needed and arranged into two sets of sequences, and a sequence switching interval X is set so that they are rotated at a certain period, ensuring the uniform operation of the joint control air compressors.

[0117] Assuming that the number of days in the current year is D and the switching interval is X, then the formula " %2", = is the rounding symbol. A result of 0 indicates sequence 1, and a result of 1 indicates sequence 2. When D / X is an integer, it indicates that the current day is a sequence change day. The compressor sequence change occurs at midnight on the day the sequence changes. If all compressors are shut down at midnight, they will be restarted in the new sequence in the morning. If the compressors are still running at midnight, they will be shut down first, and the subsequent compressors will be restarted in the new sequence.

[0118] This embodiment uses the logic controller in the edge control cabinet as the carrier and the cloud platform or touch screen as the monitoring window. By real-time collection of pressure and flow signals from the air compressor outlet, main pipe, and plant gas terminal, and combining data such as the electrical signals and status signals of the air compressor and cold dryer, it can realize intelligent joint control of multiple air compressor stations, fixed-frequency air compressors, and cold dryers under cloud-edge collaboration. Among them, intelligent joint control includes communication, data collection, gas demand judgment, air compressor operation quantity calculation, air compressor and cold dryer status processing, master station and sub-station, power on and off control, joint control function enablement, main pipe high and low level upper and lower limits, addition and subtraction machines, advanced subtraction machines, fixed frequency special subtraction machines, sequential joint control, joint control rotation, joint control error correction mechanism and other functions. Through this embodiment, the air compressor can be started and stopped on a scheduled, on-demand, and rotated basis, thereby reducing energy costs, enhancing operational stability, extending equipment service life, improving equipment operation and maintenance efficiency, and optimizing the plant energy management model.

[0119] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0120] Figure 6 FIG is a schematic diagram of an edge controller 60 provided by an embodiment of the present invention. Figure 6 As shown, the edge controller 60 of this embodiment includes: a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61, such as an air compressor station intelligent joint control program based on cloud-edge collaboration. When the processor 61 executes the computer program 63, the steps in the above-mentioned embodiments of the air compressor station intelligent joint control method based on cloud-edge collaboration are implemented, such as Figure 2 Steps S201 to S205 are shown.

[0121] Exemplarily, the computer program 63 may be divided into one or more modules / units, which are stored in the memory 62 and executed by the processor 61 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 63 in the edge controller 60.

[0122] The edge controller 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will appreciate that Figure 6 This is only an example of the edge controller 60 and does not constitute a limitation of the edge controller 60. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the edge controller 60 may also include input and output devices, network access devices, buses, etc.

[0123] The processor 61 may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0124] The memory 62 can be an internal storage unit of the edge controller 60, such as a hard drive or memory within the edge controller 60. Alternatively, the memory 62 can be an external storage device within the edge controller 60, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash memory card, etc. Furthermore, the memory 62 can include both the internal storage unit of the edge controller 60 and an external storage device. The memory 62 is used to store the computer program and other programs and data required by the edge controller 60. The memory 62 can also be used to temporarily store data that has been output or is about to be output.

[0125] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0126] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0127] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0128] In the embodiments provided by the present invention, it should be understood that the disclosed devices / edge controllers and methods can be implemented in other ways. For example, the device / edge controller embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0129] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0130] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0131] If the integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the processes in the above-mentioned method embodiments by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium.

[0132] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An intelligent joint control method for air compressor stations based on cloud-edge collaboration, characterized in that: The method is applied to each air compression station of the air compression system; the air compression system includes multiple air compression stations, one of which is a main station and the other air compression stations are auxiliary stations; The method comprises: Determine the control mode of the air compressor station. If the control mode is edge-linked control mode, obtain the edge-linked control parameters of the air compressor station from the cloud platform. The edge-linked control parameters include: global power-on and power-off timing parameters, the air compressors participating in edge-linked control of the air compressor station, and the order of adding and subtracting air compressors; Determine whether the air compressor station is the master station. If so, activate the air compressor station according to the global on / off timing parameters. Control the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station, and synchronously send the operating parameters of the air compressor station to other air compressor stations and the cloud platform. If the air compressor station is a secondary station, after the primary station is put into operation, the commissioning strategy of the air compressor station is determined according to the type of the air compressor station; the air compressor station is commissioned according to the commissioning strategy; the operation of the air compressors in the air compressor station is controlled according to the main pipe pressure of the air compressor station and the order of the air compressors and adders and subtractors participating in the edge joint control of the air compressor station, and the operating parameters of the air compressor station are synchronously sent to other air compressor stations and the cloud platform; For an air compression station connected to a large gas consumption device at the end, the operating parameters include: the operating status of the large gas consumption device; The method further comprises: If the air compressor station is the main station, the upper and lower limits of the main pipe pressure are set according to the operating status of all large-gas-consuming equipment, and the upper and lower limits of the main pipe pressure are sent to other air compressor stations; wherein, the upper and lower limits of the main pipe pressure are set according to the operating status of all large-gas-consuming equipment, including: if all large-gas-consuming equipment are in the off state and the duration reaches a first preset time threshold, the upper and lower limits of the main pipe pressure are set to the low position; otherwise, the upper and lower limits of the main pipe pressure are set to the high position; wherein the upper limit value of the high position is greater than the upper limit value of the low position, and the lower limit value of the high position is greater than the lower limit value of the low position; If this air compressor station is a slave station, it will receive the upper and lower limits of the main pipe pressure sent by the master station and set them.

2. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to claim 1 is characterized in that: The control of the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station includes: Determine the relationship between the main pipe pressure of the air compressor station and the upper and lower limits of the main pipe pressure; If the main pipe pressure of the air compressor station is lower than the main pipe pressure lower limit, the air compressors participating in the edge joint control of the air compressor station and the order of adding the air compressors will be delayed in sequence until the main pipe pressure of the air compressor station is between the upper and lower limits of the main pipe pressure; wherein, the delayed start of the air compressor means that each time an air compressor is turned on, it is delayed to determine whether the main pipe pressure is between the upper and lower limits of the main pipe pressure; If the main pipe pressure of this air compressor station is greater than the upper limit of the main pipe pressure, the air compressors will be shut down in sequence according to the air compressors participating in the edge joint control of this air compressor station and the order of reducing the machines, until the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure; wherein, the delayed shutdown of the air compressor is to delay the judgment of whether the main pipe pressure is between the upper and lower limits of the main pipe pressure each time an air compressor is shut down.

3. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to claim 2 is characterized in that: The air compressors participating in the edge joint control of the air compressor station and the order of adding the air compressors are shut down in sequence until the main pipe pressure of the air compressor station is between the upper and lower limits of the main pipe pressure, including: If the air compressor that needs to be shut down is a fixed-frequency air compressor, unload the fixed-frequency air compressor first; Continuously monitoring the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure within a second preset time threshold after the fixed-frequency air compressor is unloaded; If the main pipe pressure is greater than the main pipe pressure lower limit within the second preset time threshold, the fixed-frequency air compressor is turned off; otherwise, the fixed-frequency air compressor is reloaded.

4. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to claim 2 is characterized in that: Before sequentially delaying the start of the air compressors, the method further includes: If the air compressor station is dedicated to large-volume gas equipment, then the terminal flow rate is used to determine whether the large-volume gas equipment corresponding to the air compressor station is turned on; If the corresponding large gas consumption equipment has been turned on, all the air compressors will be turned on in sequence without delay according to the air compressors participating in the edge joint control of this air compressor station and the order of adding the air compressors.

5. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to claim 2 is characterized in that: The controlling of the operation of the air compressors in the air compressor station according to the main pipe pressure of the air compressor station and the sequence of the air compressors and adders and subtracters participating in the edge joint control of the air compressor station also includes: Determine the relationship between the main pipe pressure of the air compressor station and the upper and lower limits of the main pipe pressure; If the main pipe pressure of this air compressor station is between the upper and lower limits of the main pipe pressure, and there are variable frequency air compressors in this air compressor station whose power and flow are both less than the corresponding preset thresholds, the variable frequency air compressors will be shut down in sequence with delayed shutdown according to the order in which they are reduced, until the main pipe pressure will be less than the lower limit of the main pipe pressure if the next variable frequency air compressor is shut down, or all the variable frequency air compressors are shut down, and then the shutdown will stop.

6. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to any one of claims 1 to 5, characterized in that: If the air compressor station is a secondary station, the investment strategy of the air compressor station is determined according to the type of the air compressor station, including: If the type of the air compressor station is a standby station, it is determined whether the main pipe pressure of the air compressor station is less than the lower limit of the main pipe pressure within the preset time after the main station is put into operation; if the main pipe pressure of the air compressor station is less than the lower limit of the main pipe pressure, the air compressor station is put into operation; If the air compressor station is a dedicated station for large-volume gas equipment, after the main station is put into operation, it is determined whether the large-volume gas equipment corresponding to the air compressor station is turned on; if the large-volume gas equipment is turned on, the air compressor station is put into operation; if the large-volume gas equipment is not turned on, the air compressor station is determined to be a regular secondary station; If the type of this air compressor station is a conventional slave station, whether to put this air compressor station into operation is determined based on the relationship between the main pipe pressure and the upper and lower limits of the main pipe pressure, as well as the preset conventional slave station operation sequence.

7. The intelligent joint control method for air compressor stations based on cloud-edge collaboration according to any one of claims 1 to 5, characterized in that: The air compressors participating in edge joint control in each air compression station are divided into at least two batches; The method further comprises: For any air compressor station, obtain the rotation timing information of the air compressor station from the cloud platform; According to the rotation timing information, the at least two batches of air compressors are rotated; wherein, the batch of air compressors that are rotated to work participates in the operation control of the air compressors in this air compressor station; the other batches of air compressors that are rotated to rest do not participate in the operation control of the air compressors in this air compressor station.

8. An intelligent joint control system for air compressor stations based on cloud-edge collaboration, characterized in that: include: Cloud platform and multiple edge controllers; The multiple edge controllers are distributed in each air compression station of the air compression system and connected to the cloud platform; the edge controller is used to implement the method according to any one of claims 1 to 7.

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