A multi-stage pump station joint scheduling control method and system based on PLC control

Abstract

The application discloses a kind of based on PLC control's multistage pump station joint scheduling control method and system, the method includes: the water well liquid level set value of each pump station is determined in advance, the best liquid level interval of catch basin, the highest liquid level set value of catch basin, the water well liquid level change rate set value, the set value of catch basin liquid level change rate and pump station delivery priority;Real-time acquisition is compared with the corresponding set value respectively in series pump station each pump station current water well liquid level value, catch basin liquid level value, water well liquid level change rate, catch basin liquid level change rate, judge the pump adding and subtracting condition of each pump station;Based on the pump adding and subtracting condition of each pump station in series pump station, according to the preset pump station delivery priority, pump is added and subtracted operation is carried out.This scheme can improve the integrity of multistage sewage pump station scheduling, realize the maximization delivery level of pump station.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-level pump station joint scheduling and control method, system, computing device, and storage medium based on PLC control. Background Technology

[0002] To ensure the stable operation of the urban wastewater treatment system, it is necessary to control the operating load of each pumping station. The control system can automatically control the start-up, shutdown, and operation of the pumping stations based on preset liquid level or pressure signals.

[0003] Urban drainage systems often include several sewage lifting pump stations, with each level of pump station connected in series and terminal pump stations connected in parallel to form a regional drainage network. The problem of multi-level pump station optimization scheduling refers to achieving goals such as minimizing energy consumption, maximizing water supply, and minimizing sewage treatment costs through the joint scheduling of multiple pump stations. Currently, sewage pump stations are often operated by setting the starting combinations of each pump for scheduling. While this method ensures the normal operation of regional drainage, it lacks a certain degree of overall integrity and rationality. It fails to maximize the horizontal transport capacity of the pump stations and increases the risk of overflow from external pipe networks.

[0004] Chinese patent application CN102645914A discloses a multi-level ring network control architecture and method for wastewater treatment plants, including management equipment, central control equipment, PLC control equipment, and data transmission equipment. Different control stations are integrated into the central control equipment to achieve integrated control and industrial automation. This solution improves control efficiency and treatment effect, but it cannot maximize the pumping capacity of the pumping station. Summary of the Invention

[0005] To maximize the pumping capacity of the pumping stations, this solution provides a multi-level pumping station joint scheduling control method and system based on PLC control. By monitoring the flow rate, pressure, and liquid level of each pumping station in real time, the system makes logical judgments on adding or removing pumps from the series pumping stations and performs pumping operations according to the priority sorting rules of the terminal pumping stations, which can improve the overall stability of multi-level sewage pumping station scheduling.

[0006] According to a first aspect of the present invention, a multi-level pump station joint scheduling and control method based on PLC control is provided, comprising: pre-determining the setpoint for the outlet well liquid level, the optimal liquid level range for the collection well, the setpoint for the highest liquid level of the collection well, the setpoint for the liquid level change rate of the outlet well, the setpoint for the liquid level change rate of the collection well, and the pump station delivery priority for each pump station; comparing the current outlet well liquid level, collection well liquid level, outlet well liquid level change rate, and collection well liquid level change rate of each pump station in the series with the corresponding setpoints in real time, and determining the pump addition / reduction status of each pump station; and performing pump addition and reduction operations according to the preset pump station delivery priority based on the pump addition / reduction status of each pump station in the series.

[0007] By using the above technical solution, data such as liquid level and liquid level change rate of multi-stage pumping stations can be judged, and the determination of whether to start or stop the pump or adjust the pump operating speed can be made based on the judgment results, thus realizing the automated control of multi-stage pumping stations.

[0008] Optionally, in the multi-level pump station joint scheduling and control method based on PLC control provided by the present invention, the PLC sub-controller acquires in real time the water level of the outlet well and the water level of the collection well collected by the level sensor, the flow data of the outlet well and the water collection well collected by the flow sensor, and the operating status of the drainage equipment; and determines the scheduling logic of the series pump stations according to the judgment order of the current pump station outlet well level, water collection well level, outlet well level change rate, water collection well level change rate, and downstream pump station collection well level.

[0009] Optionally, in the multi-level pump station joint scheduling control method based on PLC control provided by the present invention, when the liquid level of the current pump station outlet well is greater than or equal to the liquid level set value, the pump is reduced by the pump frequency converter; otherwise, it is determined whether the current water collection well liquid level is within the optimal water collection well liquid level range. If the current water level in the sump is within the optimal water level range, the pump station will not operate. If the current water level in the sump is greater than or equal to the high level in the optimal water level range, it will determine whether the water level change rate in the outlet well is greater than or equal to the set value. If the water level change rate in the outlet well is greater than or equal to the set value, the pump will be reduced via the pump frequency converter. Otherwise, it will determine whether the water level change rate in the sump is less than the set value. If the rate of change of the water level in the sump is less than the set value, the pump station will not operate. If the rate of change of the water level in the sump is not less than the set value, the water level in the sump of the downstream pump station will be compared with the set maximum water level in the sump. If the water level in the sump of the downstream pump station is greater than or equal to the maximum water level in the sump, the current pump station will not operate. If the water level in the sump of the downstream pump station is less than the maximum water level in the sump, the current pump station will start pumping. If the current water level in the sump is lower than the low level of the optimal water level range, the current water level change rate of the pump station's sump is compared with the set value of the water level change rate of the sump. If the water level change rate of the sump is greater than or equal to the set value, the pump station will not operate; otherwise, the pump will be reduced through the pump frequency converter.

[0010] Optionally, in the multi-level pump station joint scheduling and control method based on PLC control provided by the present invention, the series pump station includes multiple terminal pump stations connected in sequence on the same pipeline, the outlet of each terminal pump station is connected to the inlet of the downstream pump station, and multiple series pump stations are simultaneously connected on a pipeline to form a parallel pump station.

[0011] Optionally, in the multi-level pump station joint scheduling control method based on PLC control provided by the present invention, for terminal pump stations in series that need to reduce pumping, the pump reduction operation is directly performed through the pump frequency converter; for terminal pump stations in series that need to add pumping, the number of lines that can add pumping is determined according to the range of the water level change rate of the collection well; the terminal pump stations are sorted according to their water level score and delivery priority score, and the pumping operation is performed from high to low according to the score sort.

[0012] According to a second aspect of the present invention, a multi-level pump station joint scheduling and control system based on PLC control is provided, including a server, a core switch, a main controller, a PLC sub-controller, a data acquisition device, and a drainage device. The data acquisition device includes a flow sensor and a liquid level sensor, and the drainage device includes a water pump frequency converter and a sewage lift pump. The server is connected to the main controller via a core switch. The main controller is connected to multiple PLC sub-controllers via the core switch. The PLC sub-controllers are connected to drainage equipment and data acquisition equipment.

[0013] The main controller is used to acquire monitoring data from multiple PLC sub-controllers through the core switch, send the monitoring data to the server, and receive control commands from the server. The control commands are then sent to the corresponding PLC sub-controllers. The monitoring data includes the water level of the outlet well and the water level of the collection well collected by the level sensor, the flow data of the outlet well and the water collection well collected by the flow sensor, and the operating status of the drainage equipment. The server is used to compare the current effluent well level, sump level, effluent well level change rate, and sump level change rate of each pump station in the series pump station with the set values ​​to determine the pumping status of each pump station; based on the pumping status of each pump station in the series pump station, the server controls the pump frequency converter to perform pumping and pumping operations on the sewage lift pump according to the preset pumping priority.

[0014] Optionally, in the multi-level pump station joint scheduling and control system based on PLC control provided by the present invention, the server provides a visual monitoring interface and has built-in configuration software for configuring alarms and event handling, setting parameters, sending control commands, recording and analyzing data.

[0015] Optionally, in the multi-level pump station joint scheduling and control system based on PLC control provided by the present invention, the type, installation location and set value of the sewage lifting pump are determined according to different working conditions and requirements.

[0016] According to a third aspect of the present invention, a computing device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes a multi-level pump station joint scheduling control method based on PLC control as described in the first aspect.

[0017] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, comprising storing a computer program that can be loaded by a processor and executed as in the first aspect, a PLC-based multi-level pump station joint scheduling control method.

[0018] The multi-level pumping station joint scheduling and control method and system based on PLC control provided by this invention integrates the control of each pumping station into a whole, realizes remote automatic control of drainage pumping stations, and can realize the maximum delivery operation scheme of multi-level pumping stations under different operating conditions, thereby improving the stability of regional drainage system operation.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a multi-level pump station joint scheduling and control system based on PLC control according to an embodiment of the present invention is shown; Figure 2 A flowchart illustrating a multi-level pump station joint scheduling and control method 200 based on PLC control according to an embodiment of the present invention is shown. Figure 3 A schematic diagram of the liquid level setpoints for each pumping station according to an embodiment of the present invention is shown; Figure 4 A structural diagram of a computing device 100 according to an embodiment of the present invention is shown. Detailed Implementation

[0021] To achieve coordinated operation of sewage treatment plants, sewage pumping stations, and sewage pipe networks and improve sewage collection and treatment efficiency, this proposal suggests a multi-level pumping station coordinated scheduling control method and system based on a PLC controller.

[0022] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0023] Figure 1 A schematic diagram of a multi-level pump station joint scheduling and control system based on PLC control, according to an embodiment of the present invention, is shown. Figure 1 As shown, the system includes a server, a core switch, a main controller, PLC sub-controllers, drainage equipment, and data acquisition equipment. The drainage equipment mainly includes sewage lift pumps and pump frequency converters, while the data acquisition equipment mainly includes flow sensors and level sensors.

[0024] It should be noted that, Figure 1 The multi-stage pump station linkage and dispatch control system structure shown is merely an example. The sewage lift pumps are installed in the collection pipe of the sewage collection system or the outlet pipe of the sewage discharge system. Data acquisition equipment may also include water quality testing equipment, pressure testing equipment, etc., and may be adjusted and controlled as needed.

[0025] The server can connect to the main controller via an internal firewall and core switch to enhance the security of the main controller's internal network. The main controller connects to multiple PLC sub-controllers via the core switch, forming a local area network (LAN) for centralized management and control of these sub-controllers. Sub-controllers can be added or removed as needed, improving system flexibility and scalability.

[0026] The main controller acquires monitoring data from multiple PLC sub-controllers in real time through the core switch. The monitoring data may include the water level in the outlet well and the water level in the collection well collected by the level sensor, the flow data in the outlet well and the water collection well collected by the flow sensor, and the operating status of the drainage equipment.

[0027] The server provides a visual monitoring interface and communicates with PLC main controllers, SCADA systems, DCS distributed control systems, etc. It obtains data from the main controller through the core switch and sends commands to the main controller through the core switch. The main controller forwards the commands to the corresponding PLC sub-controllers through the core switch to execute pump increase / decrease operations.

[0028] Users can create custom graphical interfaces in the visual monitoring interface provided by the server, including elements such as buttons, indicator lights, charts, alarm information, and historical trends, for intuitive monitoring. Through the built-in configuration software, users can configure alarm and event handling, set parameters, send control commands, record and analyze data, and perform other functions.

[0029] Figure 2 A flowchart illustrating a multi-level pump station joint scheduling and control method 200 based on PLC control according to an embodiment of the present invention is shown. Figure 2As shown, the method 200 begins with step S210, which predetermines the set value of the outlet well liquid level, the optimal liquid level range of the collection well, the set value of the highest liquid level of the collection well, the set value of the outlet well liquid level change rate, the set value of the collection well liquid level change rate, and the pumping priority of each pumping station.

[0030] Figure 3 A schematic diagram of the liquid level setpoints for each pumping station according to an embodiment of the present invention is shown. Figure 3 As shown, the setpoint for the outlet well level is L4, the optimal operating level range for the collection well level is (L1, L2), and the setpoint for the highest level of the collection well level is L3.

[0031] Then, step S220 is executed, which compares the current water level value of the outlet well, the water level value of the collection well, the water level change rate of the outlet well, and the water level change rate of the collection well of each pump station in the series pump station with the corresponding set values ​​to determine the pumping status of each pump station.

[0032] First, the liquid level L of the outlet wells of each pump station in the series pump station is collected in real time through the PLC sub-controller. out Water level in the collection well (L) in NL level in the sump of the downstream pumping station in Water level change rate Water collection well level change rate Plant inlet water well level change rate It can also collect the operating status of drainage equipment such as sewage lift pumps, inlet and outlet gates, and pump frequency converters.

[0033] Among them, a series pumping station includes multiple terminal pumping stations connected in sequence on the same pipeline. The outlet of each terminal pumping station is connected to the inlet of the downstream pumping station. Multiple series pumping stations are connected to a pipeline at the same time to form a parallel pumping station.

[0034] For each pump station in a series pump station, the scheduling logic of the series pump station can be specified at a specified time interval according to the judgment order of the current pump station's outlet well level, sump well level, outlet well level change rate, sump well level change rate, and downstream pump station's sump well level.

[0035] Specifically, the current water level in the pumping station's outlet well is compared with the set water level value. If the current water level in the pumping station's outlet well is greater than or equal to the set water level value, the pump is reduced via the pump frequency converter; otherwise, it is determined whether the current water level in the collection well is within the optimal water level range. If the current water level in the sump is within the optimal water level range, the pump station will not operate. If the current water level in the sump is greater than or equal to the high level in the optimal water level range, it will determine whether the water level change rate in the outlet well is greater than or equal to the set value. If the water level change rate in the outlet well is greater than or equal to the set value, the pump will be reduced via the pump frequency converter. Otherwise, it will determine whether the water level change rate in the sump is less than the set value. If the rate of change of the water level in the sump is less than the set value, the pump station will not operate. If the rate of change of the water level in the sump is not less than the set value, the water level in the sump of the downstream pump station will be compared with the set maximum water level in the sump. If the water level in the sump of the downstream pump station is greater than or equal to the maximum water level in the sump, the current pump station will not operate. If the water level in the sump of the downstream pump station is less than the maximum water level in the sump, the current pump station will start pumping. If the current water level in the sump is lower than the low level of the optimal water level range, the current water level change rate of the pump station's sump is compared with the set value of the water level change rate of the sump. If the water level change rate of the sump is greater than or equal to the set value, the pump station will not operate; otherwise, the pump will be reduced through the pump frequency converter.

[0036] Combination Figure 3 For example, when the actual value L of the water level in the outlet well of the current pumping station is... out When the actual value L4 is greater than or equal to the set value, the pump speed is reduced directly using the water pump frequency converter; when the actual value L4 is greater than or equal to the set value L4, the pump speed is reduced. out If the level is less than the set value L4, then the level of the water collection well of the current pumping station is determined.

[0037] 1) When the water level in the collection well is L in When the pump station is in the optimal operating range (L1, L2), no operation is performed. 2) When the water level in the collection well is L in When the water level is greater than or equal to the highest liquid level L2 in the optimal operating range, first determine the rate of change ε ​​of the water well level. out When the actual value of the rate of change of the water level in the well is ε out Greater than or equal to the set value ε out set At that time, pump reduction operation is performed; When the actual value of the water level change rate in the well is ε out Less than or equal to the set value ε out set Then, determine the rate of change ε ​​of the current water level in the pump station's sump. in : When the rate of change of water level in the collection well ε in Less than -ε in set When the pump station is not in operation, and the rate of change of the water level in the sump is ε in Greater than or equal to -ε inset Then, determine the NL level in the downstream pumping station's sump. in When the downstream pumping station NL in When L3 is greater than or equal to L3, the pumping station is not operating; when the downstream pumping station NL... in When the value is less than L3, the current pumping station will add pumps.

[0038] When the water level in the collection well is L in When the liquid level is less than the lowest level L1 in the optimal operating range, determine the rate of change ε ​​of the liquid level in the current pump station's sump. in When the rate of change of water level in the collection well ε in Greater than or equal to ε in set When the pump station is not in operation, and the rate of change of the water level in the sump is ε in Less than ε in set At that time, the pumping station reduces pumping speed.

[0039] Finally, step S230 is executed, which involves adding or removing pumps based on the pumping status of each pumping station in the series pumping station, according to the preset pumping priority.

[0040] For terminal pump stations in a series pump station that require pump reduction, the pump reduction operation is performed directly through the pump frequency converter.

[0041] For terminal pump stations in a series pumping station that require additional pumps, the number of lines that can be pumped is determined based on the range of the water level change rate in the sump.

[0042] The terminal pumping stations are ranked according to their liquid level score and delivery priority score, and pumping operations are performed from highest to lowest score. The rate of change of liquid level in the plant's sump wells is ε. in plant The number of pumps required varies depending on the location within the zone.

[0043] After determining the number of lines requiring additional pumps, the terminal pump stations are then ranked according to their liquid level and delivery priority. Following this ranking, pumps are added to the terminal pump stations that meet the requirements for additional pumps and have the highest ranking scores.

[0044] The conveying priority needs to be set manually. For example, the conveying priority is: A (40 points), B (38 points), C (35 points), D (31 points), E (28 points). The liquid level score is: A (30 points), B (16.4 points), C (45 points), D (48 points), E (44 points), and the total score is: A (70 points), B (54.4 points), C (80 points), D (79 points), E (72 points).

[0045] After sorting, the terminal pump stations that meet the pumping conditions and have the highest corresponding quantity will be pumped. If five terminal pump stations need to be pumped, but the plant area allows for three pump stations to be pumped, then CDE will be selected for pumping.

[0046] Figure 4 A structural diagram of a computing device 100 according to an embodiment of the present invention is shown. Figure 4 As shown, in the basic configuration 102, the computing device 100 typically includes system memory 106 and one or more processors 104. Memory bus 108 can be used for communication between processor 104 and system memory 106.

[0047] Depending on the desired configuration, processor 104 can be any type of processor, including but not limited to: microprocessors (μP), microcontrollers (μC), digital information processors (DSPs), or any combination thereof. Processor 104 may include one or more levels of cache such as L1 cache 110 and L2 cache 112, processor core 114, and registers 116. Example processor core 114 may include an arithmetic logic unit (ALU), a floating-point unit (FPU), a digital signal processing core (DSP core), or any combination thereof. Example memory controller 118 may be used with processor 104, or in some implementations, memory controller 118 may be an internal part of processor 104.

[0048] Depending on the desired configuration, system memory 106 can be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. Physical memory in a computing device typically refers to volatile RAM, and data on a disk needs to be loaded into physical memory before it can be read by processor 104. System memory 106 may include operating system 120, one or more applications 122, and program data 124.

[0049] In some implementations, application 122 may be configured to execute instructions on an operating system using program data 124 by one or more processors 104. The operating system 120 may be, for example, Linux, Windows, etc., and includes program instructions for handling basic system services and performing hardware-dependent tasks. Application 122 includes program instructions for implementing various user-desired functions; application 122 may be, for example, a browser, instant messaging software, software development tools (e.g., integrated development environment IDE, compiler, etc.), but is not limited thereto. When application 122 is installed in computing device 100, driver modules may be added to operating system 120.

[0050] When computing device 100 starts up, processor 104 reads and executes program instructions from memory 106 of operating system 120. Application 122 runs on operating system 120, utilizing interfaces provided by operating system 120 and underlying hardware to implement various user-expected functions. When user starts application 122, application 122 is loaded into memory 106, and processor 104 reads and executes program instructions from memory 106 of application 122.

[0051] The computing device 100 also includes a storage device 132, which includes a removable storage device 136 and a non-removable storage device 138, both of which are connected to a storage interface bus 134.

[0052] The computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to the basic configuration 102 via a bus / interface controller 130. Example output devices 142 include a graphics processing unit 148 and an audio processing unit 150. They may be configured to facilitate communication with various external devices such as displays or speakers via one or more A / V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboards, mice, pens, voice input devices, touch input devices) or other peripherals (e.g., printers, scanners, etc.) via one or more I / O ports 158. Example communication devices 146 may include a network controller 160, which may be arranged to facilitate communication with one or more other computing devices 162 via a network communication link through one or more communication ports 164.

[0053] A network communication link can be an example of a communication medium. A communication medium can typically be embodied in computer-readable instructions, data structures, or program modules within a modulated data signal, such as a carrier wave or other transmission mechanism, and can include any information delivery medium. A “modulated data signal” can be a signal whose data set, or whose modifications, can be encoded with information within the signal. As a non-limiting example, a communication medium can include wired media such as wired networks or leased lines, and various wireless media including sound, radio frequency (RF), microwave, infrared (IR), or other wireless media. The term “computer-readable medium” as used herein can include both storage media and communication media. In the computing device 100 according to the invention, application 122 includes instructions for performing the PLC-based multi-level pump station joint scheduling control method 200 of the invention.

[0054] The multi-level pumping station joint scheduling and control method and system based on PLC control provided in this solution judges the current pumping station's effluent well level, effluent well level change rate, sump level, sump level change rate, downstream pumping station's sump level, and plant inlet well level change rate, and sorts the terminal pumping stations according to their level and delivery priority, forming multi-level sewage pumping station addition and subtraction rules. This improves the overall integrity and rationality of multi-level sewage pumping station scheduling and operation, and further enhances the stability of the regional drainage system operation.

[0055] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0056] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0057] As used herein, unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

[0058] It should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, rather than for explaining or limiting the subject matter of the invention.

Claims

1. A multi-level pump station joint scheduling and control method based on PLC control, characterized in that, include: Predetermine the set values ​​for the outlet well liquid level, the optimal liquid level range for the collection well, the set value for the highest liquid level of the collection well, the set value for the liquid level change rate of the outlet well, the set value for the liquid level change rate of the collection well, and the pumping priority for each pumping station. The real-time data of the current water level in the outlet well, water level in the collection well, water level change rate in the outlet well, and water level change rate in the collection well of each pump station in the series pump station are compared with the corresponding set values ​​to determine the pumping status of each pump station. Based on the pump addition and reduction status of each pump station in the series pump station, the pump addition and reduction operations are carried out according to the preset pump station delivery priority; The step of comparing the real-time acquired current outlet well level, sump well level, outlet well level change rate, and sump well level change rate of each pump station in the series pump station with the corresponding set values ​​to determine the pumping status of each pump station includes: The PLC sub-controller acquires real-time data on the water level in the outlet well and the water level in the collection well, as well as the flow rate data in the outlet well and the collection well, and the operating status of the drainage equipment, collected by the level sensor and the flow rate data collected by the flow sensor. The scheduling logic of the series pump stations is determined according to the judgment order of the current pump station outlet well level, sump well level, outlet well level change rate, sump well level change rate, and downstream pump station sump well level. The steps for specifying the scheduling logic of series pump stations according to the judgment order of the current pump station outlet well level, sump well level, outlet well level change rate, sump well level change rate, and downstream pump station sump well level include: When the current water level in the pumping station outlet well is greater than or equal to the set water level value, the pump will be reduced through the pump frequency converter; otherwise, it will continue to determine whether the current water level in the collection well is within the optimal water level range of the collection well. If the current water level in the sump is within the optimal water level range, the pump station will not operate. If the current water level in the sump is greater than or equal to the high level in the optimal water level range, it will be determined whether the water level change rate of the outlet well is greater than or equal to the set value of the water level change rate of the outlet well. If the rate of change of water level in the outlet well is greater than or equal to the set value of the rate of change of water level in the outlet well, the pump will be reduced by the pump frequency converter; otherwise, it will be determined whether the rate of change of water level in the collection well is less than the set value of the rate of change of water level in the collection well. If the rate of change of the water level in the sump is less than the set value of the rate of change of the water level in the sump, the pump station will not operate; if the rate of change of the water level in the sump is not less than the set value of the rate of change of the water level in the sump, the water level in the sump of the downstream pump station will be compared with the set highest water level in the sump. If the water level in the downstream pumping station's sump is greater than or equal to the highest water level in the sump, the current pumping station will not operate; if the water level in the downstream pumping station's sump is less than the highest water level in the sump, the current pumping station will start pumping. If the current water level in the sump is lower than the low level of the optimal water level range, the current water level change rate of the pump station's sump is compared with the set value of the water level change rate of the sump. If the water level change rate of the sump is greater than or equal to the set value, the pump station will not operate; otherwise, the pump will be reduced through the pump frequency converter.

2. The multi-level pump station joint scheduling and control method based on PLC control according to claim 1, characterized in that, The series pumping station includes multiple terminal pumping stations connected sequentially on the same pipeline. The outlet of each terminal pumping station is connected to the inlet of the downstream pumping station. Multiple series pumping stations are simultaneously connected on a pipeline to form a parallel pumping station.

3. The multi-level pump station joint scheduling and control method based on PLC control according to claim 1, characterized in that, The steps for adding and removing pumps based on the pumping status of each pump station in a series pumping station, and according to the preset pumping priority, include: For terminal pump stations in a series pump station that need to reduce pump volume, the pump reduction operation is performed directly through the pump frequency converter. For terminal pump stations in a series pumping station that require additional pumps, the number of lines that can be pumped is determined based on the range of the water level change rate in the sump. The terminal pump stations are sorted according to their liquid level score and delivery priority score, and pumping operations are performed from high to low score.

4. A multi-level pump station joint scheduling and control system based on PLC control, characterized in that, It includes servers, core switches, main controllers, PLC sub-controllers, data acquisition equipment, and drainage equipment. The data acquisition equipment includes flow sensors and liquid level sensors, and the drainage equipment includes water pump frequency converters and sewage lift pumps. The server is connected to the main controller through the core switch, and the main controller is connected to multiple PLC sub-controllers through the core switch. The PLC sub-controllers are connected to drainage equipment and data acquisition equipment. The main controller is used to acquire monitoring data from multiple PLC sub-controllers through the core switch, send the monitoring data to the server, receive control commands sent by the server, and send the control commands to the corresponding PLC sub-controllers. The monitoring data includes the water level of the outlet well and the water level of the collection well collected by the level sensor, the flow data of the outlet well and the water collection well collected by the flow sensor, and the operating status of the drainage equipment. The server is used to compare the current effluent well level, sump level, effluent well level change rate, and sump level change rate of each pump station in the series pump station with the set values ​​to determine the pumping status of each pump station; based on the pumping status of each pump station in the series pump station, the server controls the pump frequency converter to perform pumping and pumping operations on the sewage lift pump according to the preset pumping priority. The step of comparing the real-time acquired current outlet well level, sump well level, outlet well level change rate, and sump well level change rate of each pump station in the series pump station with the corresponding set values ​​to determine the pumping status of each pump station includes: The PLC sub-controller acquires real-time data on the water level in the outlet well and the water level in the collection well, as well as the flow rate data in the outlet well and the collection well, and the operating status of the drainage equipment, collected by the level sensor and the flow rate data collected by the flow sensor. The scheduling logic of the series pump stations is determined according to the judgment order of the current pump station outlet well level, sump well level, outlet well level change rate, sump well level change rate, and downstream pump station sump well level. The steps for specifying the scheduling logic of series pump stations according to the judgment order of the current pump station outlet well level, sump well level, outlet well level change rate, sump well level change rate, and downstream pump station sump well level include: When the current water level in the pumping station outlet well is greater than or equal to the set water level value, the pump will be reduced through the pump frequency converter; otherwise, it will continue to determine whether the current water level in the collection well is within the optimal water level range of the collection well. If the current water level in the sump is within the optimal water level range, the pump station will not operate. If the current water level in the sump is greater than or equal to the high level in the optimal water level range, it will be determined whether the water level change rate of the outlet well is greater than or equal to the set value of the water level change rate of the outlet well. If the rate of change of water level in the outlet well is greater than or equal to the set value of the rate of change of water level in the outlet well, the pump will be reduced by the pump frequency converter; otherwise, it will be determined whether the rate of change of water level in the collection well is less than the set value of the rate of change of water level in the collection well. If the rate of change of the water level in the sump is less than the set value of the rate of change of the water level in the sump, the pump station will not operate; if the rate of change of the water level in the sump is not less than the set value of the rate of change of the water level in the sump, the water level in the sump of the downstream pump station will be compared with the set highest water level in the sump. If the water level in the downstream pumping station's sump is greater than or equal to the highest water level in the sump, the current pumping station will not operate; if the water level in the downstream pumping station's sump is less than the highest water level in the sump, the current pumping station will start pumping. If the current water level in the sump is lower than the low level of the optimal water level range, the current water level change rate of the pump station's sump is compared with the set value of the water level change rate of the sump. If the water level change rate of the sump is greater than or equal to the set value, the pump station will not operate; otherwise, the pump will be reduced through the pump frequency converter.

5. The multi-level pump station joint scheduling and control system based on PLC control according to claim 4, characterized in that, The server provides a visual monitoring interface and has built-in configuration software for configuring alarms and event handling, setting parameters, sending control commands, and recording and analyzing data.

6. The multi-level pump station joint scheduling and control system based on PLC control according to claim 4, characterized in that, The type, installation location, and setpoints of the wastewater extraction pump are determined according to different operating conditions and requirements.

7. A computing device, comprising: At least one processor; and a memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, the program instructions including instructions for executing the PLC-based multi-level pump station joint scheduling control method as described in any one of claims 1-3.

8. A readable storage medium storing program instructions, which, when read and executed by a computing device, cause the computing device to perform the multi-level pump station joint scheduling control method based on PLC control as described in any one of claims 1-3.

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