Non-closure multi-pump linkage efficient operation control method

Abstract

The invention discloses a non-closure multi-pump linkage efficient operation control method, and belongs to the field of pump station operation control. The problem that in the prior art, flow or pressure needs to be adjusted in a cut-off mode is solved, multi-dimensional working parameters such as flow, pressure, power and rotating speed of all water pumps of the multi-pump system are monitored in real time and compared with a preset water supply demand curve for analysis, and the total target flow and pressure are adjusted in time; according to the method, the stability of the water supply pressure and flow is ensured, the multi-pump linkage control model is accurately established, the operation frequency of each water pump can be determined according to the water supply requirement, variable-frequency speed regulation control over all the water pumps can be achieved, non-closure multi-pump cooperative operation is achieved, closure loss in a traditional method is avoided, and therefore the operation efficiency of the water pumps is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pump station operation control, in particular to a method for controlling the efficient operation of multiple pumps in linkage without flow interruption. Background Art

[0002] A pump is a machine that transports or pressurizes fluids. When the liquid channel is long, the kinetic energy output of a single pump cannot meet the needs of a large amount of liquid. Multiple water pumps are needed for kinetic energy output. This involves a unified and coordinated control method for multiple water pumps. By monitoring the operating status of multiple water pumps, centralized control of water pump start, stop, switching and other instructions can be achieved. Traditional multi-pump control methods require flow adjustment or pressure adjustment by intercepting the flow when multiple pumps work together, resulting in reduced system efficiency, increased energy consumption, and adverse effects on the operational stability of the pumps. Therefore, it does not meet existing needs. In response to this, we propose a non-intercepted multi-pump linkage and efficient operation control method. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for efficient operation control of multi-pump linkage without interception, by real-time monitoring of multi-dimensional working parameters such as flow, pressure, power and speed of each water pump in the multi-pump system, and determining the total target flow and pressure based on the preset water supply demand curve and actual water use conditions, and then determining the operating frequency of each water pump based on a precise multi-pump linkage control model and frequency conversion speed regulation, to achieve multi-pump coordinated operation without interception, thereby solving the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: a method for controlling efficient operation of multi-pump linkage without shutoff, which is based on an established multi-pump linkage control model and performs variable frequency speed control according to water supply demand;

[0005] The non-interception multi-pump linkage efficient operation control method comprises the following steps:

[0006] Step 1: Monitor the operating parameters of each water pump in the multi-pump system in real time, including but not limited to flow rate, pressure, power and speed;

[0007] Step 2: Determine the total target flow and pressure of the multi-pump system based on the preset water supply demand curve and the current actual water usage;

[0008] Step 3: Using the established multi-pump linkage control model, combined with the real-time operating parameters of each water pump as well as the total target flow and pressure, the operating frequency of each water pump is obtained based on the corresponding relationship between the water pump frequency and flow, pressure and power in the multi-pump linkage control model;

[0009] Step 4: Perform variable frequency speed control on each water pump according to the obtained operating frequency to achieve multi-pump linkage operation without flow interruption;

[0010] In terms of digital control, the operating status of each water pump is monitored in real time. When a water pump deviates from the optimal operating point and its efficiency is lower than 85% of the rated efficiency, it automatically determines whether to adjust the pump group configuration and enable a reasonable combination of large and small pumps.

[0011] Furthermore, the step 2 includes the following steps:

[0012] Collect and analyze historical water use data, including water flow and pressure requirements over different time periods. Based on the collected data, draw a water supply demand curve that reflects the dynamic changes in water demand.

[0013] Real-time monitoring of actual water usage data. Flow and pressure digital sensors installed in the water supply network can be used to obtain real-time water flow and pressure data. The installed digital sensors cover the entire water supply area.

[0014] Compare and analyze the current actual water usage data with the preset water supply demand curve to evaluate the deviation between the current water usage and the preset demand. If the deviation exceeds the set threshold, the total target flow and pressure of the multi-pump system need to be readjusted;

[0015] Based on the deviation analysis results and the actual situation of the water supply system, the total target flow and pressure of the multi-pump system are determined.

[0016] Furthermore, the current actual water consumption data is compared with the preset water supply demand curve for analysis, including:

[0017] The current real-time monitored water flow and pressure data are compared point by point with the flow and pressure values ​​on the corresponding preset water supply demand curve, and the deviation value is calculated, specifically:

[0018] For flow rate, the difference between the actual flow rate and the preset flow rate is divided by the preset flow rate to obtain the flow rate deviation percentage;

[0019] For pressure, the difference between the actual pressure and the preset pressure is divided by the preset pressure to obtain the pressure deviation percentage;

[0020] Pre-set the deviation threshold, and determine the flow deviation threshold and pressure deviation threshold based on the actual operation experience and water supply requirements of the water supply system. The flow deviation threshold is 10% and the pressure deviation threshold is 5%;

[0021] Compare the calculated deviation value with the preset threshold, and filter out the time point when the deviation exceeds the threshold and the corresponding deviation value;

[0022] Conduct a preliminary assessment of the deviation, including statistically analyzing the frequency, duration, and degree of deviation exceeding the threshold, to determine whether the deviation between the current water use situation and the preset demand is a short-term fluctuation or a continuous deviation.

[0023] Furthermore, the step three includes the following steps:

[0024] Collect the pump performance data of the multi-pump system, including the performance curve, model, specifications and rated parameters of each pump. The collected pump performance data will serve as the basic data for building the model, and outliers and erroneous data will be eliminated;

[0025] Based on the collected water pump performance data, a multi-pump linkage control model is established. The established multi-pump linkage control model comprehensively considers the relationship between the flow rate, pressure and power of multiple water pumps at different operating frequencies;

[0026] Input the operating parameters of each water pump monitored in real time in step 1 into the multi-pump linkage control model. At the same time, the total target flow and pressure of the multi-pump system determined in step 2 are used as constraints of the multi-pump linkage control model.

[0027] According to the corresponding relationship between the water pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, combined with the real-time working parameters and the total target flow and pressure, the operating frequency of each water pump is determined.

[0028] Furthermore, the operating frequency of each water pump is determined, including:

[0029] Based on the corresponding relationship between the pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, the mutual influence of each pump is analyzed to clarify the change pattern of each parameter under different operating frequencies;

[0030] Then, based on the constraints of the total target flow and pressure, combined with the above correspondence and real-time working parameters, the initial operating frequency of each water pump is determined;

[0031] After determining the preliminary operating frequency, the multi-pump linkage control model is used for verification. The real-time monitored operating parameters of each pump are used as model inputs to verify the pump operating frequency according to the determined operating frequency.

[0032] Observe whether the flow and pressure output by the model are stable near the total target value, whether the operation status of each pump is normal, and whether the power fluctuation is within a reasonable range;

[0033] If the verification is passed, the final operating frequency of each water pump is determined.

[0034] Furthermore, the water pump performance data of the multi-pump system is collected, including:

[0035] Collect the pump performance data of each pump, and organize and verify the collected pump performance data, specifically:

[0036] Data collation: collate the performance curve data, model specifications and rated parameters of different pumps into a unified database or data structure to ensure consistent data format;

[0037] Data verification: Verify the collected pump performance data, check the completeness and accuracy of the pump performance data, and promptly correct or supplement any errors or missing data found.

[0038] Furthermore, the step 4 includes the following steps:

[0039] Each water pump is equipped with a variable frequency speed control device to adjust the speed of the motor according to the control signal;

[0040] According to the operating frequency obtained in step 3, a corresponding control signal is generated and sent to the variable frequency speed control device of each water pump;

[0041] After receiving the control signal, the variable frequency speed regulating device performs variable frequency speed regulation on the water pump motor according to the frequency indicated by the control signal, and monitors the running status of the water pump in real time during the speed regulation process;

[0042] Real-time monitoring of the operation of the entire multi-pump system, including the flow, pressure, power and other parameters of each pump, as well as the pressure and flow of the water supply network;

[0043] Based on the monitoring data, the status of the multi-pump linkage operation is evaluated. If it is found that the actual operation status deviates from the expected optimal operation status, the information is fed back to the monitoring end in a timely manner, and step three is recalculated and adjusted.

[0044] Furthermore, in step one, various digital sensors are installed at key positions of the multi-pump system, and the operating parameters of each water pump are monitored in real time through the installed various digital sensors, and the operating parameters monitored by the digital sensors are collected according to the set data acquisition frequency. At the same time, the multi-pump system is also equipped with redundant water pumps, and the operating status of each water pump is evaluated in real time using an intelligent health assessment model, and the operating time and load are reasonably allocated. In the event of a fault or maintenance, it automatically switches to the redundant water pump and isolates the faulty water pump to issue an alarm, and at the same time feeds back the fault information to the maintenance personnel.

[0045] Furthermore, collecting the working parameters monitored by the digital sensor according to the set data collection frequency includes the following steps:

[0046] Conduct a comprehensive analysis of the operating conditions of the multi-pump system to clarify the characteristics of different operating stages and the requirements for real-time data;

[0047] According to different working parameters, determine the reasonable acquisition frequency range, specifically:

[0048] For flow and pressure parameters, set the data acquisition frequency to 5-20 times per second;

[0049] For power and speed parameters, set the data collection frequency to about 1-5 times per second;

[0050] The data collection frequency is adjusted according to the problems encountered in actual applications and changes in demand. For example, when the multi-pump system encounters abnormal operating conditions or is undergoing maintenance and debugging, the data collection frequency is temporarily increased to obtain more detailed parameter change information. When the multi-pump system operates stably for a long time and there are no special needs, data collection is performed according to the above-set data collection frequency.

[0051] Furthermore, automatically switching to the redundant water pump in case of failure or maintenance includes the following steps:

[0052] Based on the real-time monitoring data of digital sensors, combined with the historical operation data and performance curve of the water pump;

[0053] Use a pre-built intelligent health assessment model to conduct real-time assessments of each pump's operating status, including vibration, temperature changes, and efficiency changes;

[0054] Based on the health assessment results, the operating time and load of each pump are reasonably allocated, including giving priority to pumps in good health to bear more loads, while appropriately reducing the operating time of pumps in less healthy conditions, rotating the operation, and balancing the wear of each pump;

[0055] When a water pump fails or requires maintenance, the fault signal is automatically detected and an instruction is immediately issued to switch to the redundant water pump;

[0056] At the same time, the faulty water pump is isolated through the solenoid valve or electric valve isolation device, and the connection between the faulty water pump and the main pipeline of the multi-pump system is cut off;

[0057] The fault information is promptly fed back to the monitoring end through wired or wireless communication and a maintenance work order is generated and distributed to the maintenance personnel. The maintenance personnel will maintain the faulty water pump according to the distributed maintenance work order.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The present invention monitors the working parameters and water usage data of each water pump in the multi-pump system in real time, compares and analyzes them with the preset water supply demand curve, and promptly adjusts the total target flow and pressure to ensure the stability of the water supply pressure and flow, thereby improving the reliability and stability of the water supply. Then, by accurately establishing a multi-pump linkage control model, the operating frequency of each water pump is determined according to the water supply demand and variable frequency speed control is performed, so that the multi-pump system can meet the water demand while avoiding the interception loss in the traditional method, thereby improving the operating efficiency of the water pump, reducing energy consumption, and achieving energy-saving operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 The present invention is a flow chart of the method for controlling efficient operation of multiple pumps in linkage without shutoff. DETAILED DESCRIPTION

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0062] In order to solve the technical problem that the existing multi-pump control method needs to adjust the flow or pressure by intercepting the flow when multiple pumps work together, which leads to reduced system efficiency, increased energy consumption, and adverse effects on the operational stability of the pumps, please refer to Figure 1 , this embodiment provides the following technical solutions:

[0063] A method for controlling efficient operation of multi-pump linkage without shutoff, which is based on an established multi-pump linkage control model and performs variable frequency speed control according to water supply demand;

[0064] The non-interception multi-pump linkage efficient operation control method comprises the following steps:

[0065] Step 1: Monitor the operating parameters of each water pump in the multi-pump system in real time, including but not limited to flow rate, pressure, power and speed;

[0066] Step 2: Determine the total target flow and pressure of the multi-pump system based on the preset water supply demand curve and the current actual water usage;

[0067] Step 3: Using the established multi-pump linkage control model, combined with the real-time operating parameters of each water pump as well as the total target flow and pressure, the operating frequency of each water pump is obtained based on the corresponding relationship between the water pump frequency and flow, pressure and power in the multi-pump linkage control model;

[0068] Step 4: Perform variable frequency speed control on each water pump according to the obtained operating frequency to achieve multi-pump linkage operation without flow interruption;

[0069] In terms of digital control, the operating status of each water pump can be monitored in real time. When a water pump deviates from the optimal operating point and its efficiency is lower than 85% of the rated efficiency (this threshold can be flexibly set), it will automatically determine whether to adjust the pump group configuration and enable a reasonable combination of large and small pumps, thereby ensuring that the entire multi-pump system is always in an efficient and energy-saving state.

[0070] The technical effect of the above technical solution is: by real-time monitoring of the working parameters of each water pump in the multi-pump system, such as flow, pressure, power and speed, the current operating status of each water pump can be grasped in time, and preparation can be made for subsequent precise control. According to the preset water supply demand curve and the current actual water use situation, the total target flow and pressure of the multi-pump system can be determined to ensure the stability of the water supply pressure and flow, thereby improving the reliability and stability of the water supply. Then, by establishing a multi-pump linkage control model and determining the operating frequency of each water pump according to the water supply demand, variable frequency speed control is realized, so that the water pump can meet the flow and pressure requirements while avoiding the energy loss caused by interception in the traditional multi-pump system, thereby improving the operating efficiency of the water pump and reducing energy consumption, thereby achieving the purpose of energy saving.

[0071] Step 2 includes the following steps:

[0072] Collect and analyze historical water use data, including water flow and pressure requirements over different time periods (e.g., different times of the day, different days of the week, different seasons, etc.). Based on the collected data, draw a water supply demand curve. The water supply demand curve is used to reflect the dynamic changes in water demand;

[0073] Real-time monitoring of actual water usage data. Flow and pressure digital sensors installed in the water supply network can be used to obtain real-time water flow and pressure data. The installed digital sensors cover the entire water supply area.

[0074] Compare and analyze the current actual water usage data with the preset water supply demand curve to evaluate the deviation between the current water usage and the preset demand. If the deviation exceeds the set threshold (for example, the flow deviation exceeds 10%, the pressure deviation exceeds 5%), the total target flow and pressure of the multi-pump system need to be readjusted;

[0075] Based on the deviation analysis results and the actual situation of the water supply system (for example, the water supply range, the nature of the water supply object, etc.), the total target flow and pressure of the multi-pump system are determined. The total target flow should meet the actual water demand and leave a certain margin to cope with sudden water use situations; the total target pressure should ensure that all users in the water supply area can obtain sufficient water pressure, while avoiding risks such as pipeline damage caused by excessive pressure.

[0076] The technical effect of the above technical solution is: by collecting historical water use data to draw a water supply demand curve and monitoring current water use data in real time, it is possible to accurately grasp the dynamic changes in water demand, thereby timely adjusting the total target flow and pressure, ensuring stable and reliable water supply, and reasonably determining the total target pressure. While ensuring that users in the water supply area have sufficient water pressure, it prevents excessive pressure from damaging pipeline equipment, reducing maintenance costs and the probability of water outages, and then reasonably determining the total target pressure. While ensuring that users in the water supply area have sufficient water pressure, it prevents excessive pressure from damaging pipeline equipment, reducing maintenance costs and the probability of water outages. At the same time, the total target flow and pressure are accurately determined to avoid energy waste caused by excessive water supply or excessive pressure in the system. At the same time, combined with subsequent variable frequency speed control, the water pump can operate efficiently while meeting demand, effectively reducing the energy consumption of the water supply system.

[0077] Compare and analyze the current actual water usage data with the preset water supply demand curve, including:

[0078] The current real-time monitored water flow and pressure data are compared point by point with the flow and pressure values ​​on the corresponding preset water supply demand curve, and the deviation value is calculated, specifically:

[0079] For flow rate, the difference between the actual flow rate and the preset flow rate is divided by the preset flow rate to obtain the flow rate deviation percentage;

[0080] For pressure, the difference between the actual pressure and the preset pressure is divided by the preset pressure to obtain the pressure deviation percentage;

[0081] Pre-set the deviation threshold, and determine the flow deviation threshold and pressure deviation threshold based on the actual operation experience and water supply requirements of the water supply system. The flow deviation threshold is 10% and the pressure deviation threshold is 5%;

[0082] Compare the calculated deviation value with the preset threshold, and filter out the time point when the deviation exceeds the threshold and the corresponding deviation value;

[0083] Conduct a preliminary assessment of the deviation, including statistically analyzing the frequency, duration, and degree of deviation exceeding the threshold, to determine whether the deviation between the current water use situation and the preset demand is a short-term fluctuation or a continuous deviation.

[0084] The technical effects of the above technical solution are as follows: by comparing actual water consumption data with the preset water supply demand curve point by point, accurately calculating the flow and pressure deviation percentages, and comparing them with thresholds to screen for deviations exceeding the standard, it is possible to promptly detect changes in water demand, thereby providing a basis for adjusting the operating parameters of the multi-pump system to ensure stable water supply. By calculating the pressure deviation percentage and comparing it with the threshold, it is possible to effectively monitor the water supply pressure. When the pressure deviation exceeds the standard, timely adjustments are made to prevent damage to pipes and equipment due to excessive pressure, ensure the safe and stable operation of the water supply system, reduce equipment maintenance costs and the risk of water outages, and conduct preliminary assessments of the deviation to distinguish between short-term fluctuations and sustained deviations, allowing for targeted inspection and maintenance, improving maintenance efficiency, and reducing operating and maintenance costs.

[0085] Step three includes the following steps:

[0086] Collect the pump performance data of the multi-pump system, including the performance curve, model, specifications and rated parameters of each pump. The collected pump performance data will serve as the basic data for building the model, and outliers and erroneous data will be eliminated;

[0087] Based on the collected water pump performance data, a multi-pump linkage control model is established. The established multi-pump linkage control model comprehensively considers the relationship between the flow rate, pressure and power of multiple water pumps at different operating frequencies;

[0088] Input the operating parameters of each water pump monitored in real time in step 1 into the multi-pump linkage control model. At the same time, the total target flow and pressure of the multi-pump system determined in step 2 are used as constraints of the multi-pump linkage control model.

[0089] According to the corresponding relationship between the water pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, combined with the real-time working parameters and the total target flow and pressure, the operating frequency of each water pump is determined.

[0090] The technical effect of the above technical solution is that the collected water pump performance data of the multi-pump system includes comprehensive information such as performance curves, models, specifications and rated parameters, and outliers and erroneous data are eliminated, which can provide accurate, reliable and complete basic data for the subsequent establishment of a multi-pump linkage control model. The established multi-pump linkage control model comprehensively considers the relationship between the flow rate, pressure and power of multiple water pumps at different operating frequencies, so that the multi-pump linkage control model can more comprehensively and accurately reflect the actual working status of the multi-pump system under various operating conditions, thereby providing a strong basis and simulation environment for the subsequent determination of the operating frequency of the water pumps. The operating parameters of each water pump monitored in real time are input into the model, and the total target flow rate and pressure of the multi-pump system determined in step 2 are combined as constraints to ensure that the determined water pump operating frequency not only meets the real-time system operating conditions but also meets the predetermined total target flow rate and pressure requirements. Finally, according to the correspondence between the water pump operating frequency and flow rate, pressure and power reflected in the multi-pump linkage control model, combined with the real-time operating parameters and the total target flow rate and pressure, the operating frequency of each water pump can be determined, thereby achieving optimized operation of the multi-pump system.

[0091] Determine the operating frequency of each pump, including:

[0092] Based on the corresponding relationship between the pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, the mutual influence of each pump is analyzed to clarify the change pattern of each parameter under different operating frequencies;

[0093] Then, based on the constraints of the total target flow and pressure, combined with the above correspondence and real-time working parameters, the initial operating frequency of each water pump is determined;

[0094] After determining the preliminary operating frequency, the multi-pump linkage control model is used for verification. The real-time monitored operating parameters of each pump are used as model inputs to verify the pump operating frequency according to the determined operating frequency.

[0095] Observe whether the flow and pressure output by the model are stable near the total target value, whether the operation status of each pump is normal, and whether the power fluctuation is within a reasonable range;

[0096] If the verification is passed, the final operating frequency of each water pump is determined.

[0097] The technical effect of the above technical solution is: according to the correspondence between the water pump operating frequency and the flow, pressure and power reflected in the multi-pump linkage control model, and combined with the real-time working parameters and the total target flow and pressure, the preliminary operating frequency of each water pump is determined, so that the determined operating frequency can comprehensively consider the influence of various factors. After determining the preliminary operating frequency, the multi-pump linkage control model can be used to verify the determined operating frequency. Through verification, it can be discovered in time whether there is any unreasonableness in the determined operating frequency, so that the preliminary determined operating frequency can be adjusted and optimized, so as to ensure that the operating frequency of each water pump finally determined is strictly verified, thereby improving the operating stability and reliability of the multi-pump system.

[0098] Collect pump performance data for multi-pump systems, including:

[0099] Collect the pump performance data of each pump, and organize and verify the collected pump performance data, specifically:

[0100] Data collation: collate the performance curve data, model specifications and rated parameters of different pumps into a unified database or data structure to ensure consistent data format;

[0101] Data Verification: Verify the collected pump performance data and check its completeness and accuracy, including verifying the reliability of the data by comparing data from different sources or conducting actual tests. Any errors or missing data found will be corrected or supplemented in a timely manner.

[0102] The technical effect of the above technical solution is: the performance curve data, model specifications and rated parameters of different water pumps are uniformly organized into a standardized database or data structure, which can ensure the consistency of the data format, thereby providing a high-quality data foundation for the subsequent multi-pump linkage control model establishment, data analysis and optimization algorithm application. By verifying the collected water pump performance data and checking the integrity and accuracy of the data, it can be ensured that the data input into the multi-pump linkage control model is true and reliable, thereby improving the accuracy of the model and the credibility of the optimization results.

[0103] Step 4 includes the following steps:

[0104] Each water pump should be equipped with a variable frequency speed control device to adjust the motor speed according to the control signal. The variable frequency speed control device should have safety functions such as overload protection, short circuit protection, and overvoltage protection to ensure the safe operation of the water pump system;

[0105] Based on the operating frequency obtained in step 3, a corresponding control signal is generated and sent to the variable frequency speed control device of each water pump. The transmission of the control signal should ensure real-time and accuracy to avoid inaccurate adjustment of the water pump operating frequency due to signal delay or error;

[0106] After receiving the control signal, the variable frequency speed control device performs variable frequency speed control on the water pump motor according to the frequency indicated by the control signal, and monitors the operating status of the water pump (such as current, voltage, temperature, etc.) in real time during the speed control process;

[0107] Real-time monitoring of the operation of the entire multi-pump system, including the flow, pressure, power and other parameters of each pump, as well as the pressure and flow of the water supply network;

[0108] Based on the monitoring data, the status of the multi-pump linkage operation is evaluated. If the actual operation status deviates from the expected optimal operation status (for example, the flow or pressure does not reach the target value, or some pumps are unstable), the information is promptly fed back to the monitoring end, and step three is recalculated and adjusted;

[0109] Among them, the monitoring end adopts advanced digital display technology (such as touch screen or large-screen display). Through the digital communication network, the monitoring end can receive sensor data and feedback information from each water pump, and is used to display the flow, pressure, power, speed and other parameters of each water pump in real time, as well as the received feedback information, and the pressure and flow conditions of the water supply network.

[0110] The technical effect of the above technical solution is: based on the obtained operating frequency, a corresponding control signal is generated, so that the variable frequency speed regulation device can accurately adjust the speed of the water pump motor according to the control signal, thereby avoiding unnecessary energy loss and making the water pump operate in the optimal working condition. The real-time monitoring and feedback mechanism ensures that the system operates as expected, corrects deviations in time, and avoids water supply problems caused by unstable operation or abnormal parameters, thereby ensuring the continuity of water supply.

[0111] In step one, various digital sensors are installed at key locations of the multi-pump system. The operating parameters of each water pump are monitored in real time through the installed digital sensors, and the operating parameters monitored by the digital sensors are collected according to the set data acquisition frequency. At the same time, the multi-pump system is also equipped with redundant water pumps. The intelligent health assessment model is used to evaluate the operating status of each water pump in real time, reasonably allocate the operating time and load, and automatically switch to the redundant water pump in the event of a fault or maintenance, isolate the faulty water pump, and issue an alarm, while feeding back the fault information to the maintenance personnel.

[0112] In this embodiment, a high-precision flow digital sensor is installed on the water outlet pipe of each water pump to ensure that the digital sensor can accurately and in real time measure the flow of the water pump; a pressure digital sensor is set at the inlet and outlet positions of the water pump to monitor the inlet and outlet pressures in real time; a power monitoring device is equipped for each water pump to measure the power consumption of the water pump motor in real time; and a speed digital sensor is installed on the shaft of the water pump motor to monitor the speed of the water pump in real time.

[0113] In this embodiment, during the data acquisition process, high-precision digital sensors are used, which can convert physical quantities such as flow, pressure, power and speed into digital signals with extremely high accuracy and frequency, and filter, denoise and feature extract the large amount of collected data to ensure that the data input into the multi-pump linkage control model is accurate and reliable.

[0114] The technical effect of the above technical solution is: various digital sensors are installed at key positions of the multi-pump system, which can monitor the working parameters of each water pump in real time and accurately, and collect monitoring data according to the set data acquisition frequency to ensure that the acquired water pump operation information is timely and accurate, and provide reliable data support for subsequent system control and optimization. At the same time, redundant water pumps are equipped and automatically switched to redundant water pumps in the event of failure or maintenance, which can effectively ensure the continuity and reliability of the multi-pump system.

[0115] Collecting the working parameters monitored by the digital sensor according to the set data collection frequency includes the following steps:

[0116] Conduct a comprehensive analysis of the operating conditions of the multi-pump system to clarify the characteristics of different operating stages and the requirements for real-time data, including:

[0117] During the startup phase of a multi-pump system, the various parameters of the water pumps change rapidly, requiring a higher data acquisition frequency to promptly capture the changing trends of the parameters. During the stable operation phase of the system, the parameter changes are relatively gradual, and the acquisition frequency can be appropriately reduced to reduce the data processing burden.

[0118] According to different working parameters, determine the reasonable acquisition frequency range, specifically:

[0119] For flow and pressure parameters, set the data acquisition frequency to 5-20 times per second;

[0120] For power and speed parameters, set the data collection frequency to about 1-5 times per second;

[0121] At the same time, considering the overall operating efficiency and data processing capabilities of the multi-pump system, if the acquisition frequency is too high, a large amount of data will be generated, which will put a lot of pressure on the data storage and processing system and may affect the response speed of the entire control system. Therefore, it is necessary to reasonably balance the relationship between the acquisition frequency and system performance while meeting the real-time monitoring requirements;

[0122] The data collection frequency is adjusted according to the problems encountered in actual applications and changes in demand. For example, when the multi-pump system encounters abnormal operating conditions or is undergoing maintenance and debugging, the data collection frequency is temporarily increased to obtain more detailed parameter change information. When the multi-pump system operates stably for a long time and there are no special needs, data collection is performed according to the above-set data collection frequency.

[0123] The technical effect of the above technical solution is: the data collection frequency can be flexibly adjusted according to different operating stages and actual application conditions, which can better adapt to different operating conditions and demand changes, thereby meeting real-time monitoring requirements while avoiding the pressure on the data storage and processing system due to excessive data volume, providing strong guarantees for the stable operation of the multi-pump system.

[0124] Automatic switchover to redundant pumps in case of failure or maintenance involves the following steps:

[0125] Based on the real-time monitoring data of digital sensors, combined with the historical operation data and performance curve of the water pump;

[0126] Use a pre-built intelligent health assessment model to conduct real-time assessments of each pump's operating status, including vibration, temperature changes, and efficiency changes;

[0127] Based on the health assessment results, the operating time and load of each pump are reasonably allocated, including giving priority to pumps in good health to bear more loads, while appropriately reducing the operating time of pumps in less healthy conditions, rotating the operation, and balancing the wear of each pump;

[0128] When a water pump fails or requires maintenance, it automatically detects the fault signal (for example, a digital sensor detects an abnormal parameter exceeding a set threshold, such as a sudden drop in flow, abnormal pressure fluctuation, or a sudden increase in power), and immediately issues a command to switch to the redundant water pump;

[0129] At the same time, the faulty water pump is isolated through the solenoid valve or electric valve isolation device, and the connection between the faulty water pump and the main pipeline of the multi-pump system is cut off;

[0130] The fault information is promptly fed back to the monitoring end through wired or wireless communication and a maintenance work order is generated and distributed to the maintenance personnel. The maintenance personnel will maintain the faulty water pump according to the distributed maintenance work order.

[0131] The technical effect of the above technical solution is: using the intelligent health assessment model to evaluate the operating status of each water pump in real time, it can promptly discover potential faults of the water pump, such as abnormal vibration, excessive temperature, decreased efficiency, etc., and respond quickly when a fault occurs. Once a potential fault is discovered, it automatically switches to the redundant water pump (the switching process is achieved through data communication technology), and the fault information is promptly fed back to the maintenance personnel, which speeds up the fault handling speed and reduces the fault loss. By equipping redundant water pumps and automatically switching to the redundant water pumps in the event of a fault or maintenance, while isolating the faulty water pump and issuing an alarm, the continuity and reliability of the multi-pump system can be effectively guaranteed, and the entire multi-pump system can be prevented from being shut down due to the failure of a single water pump.

[0132] Working principle: By real-time monitoring of the working parameters of each water pump in the multi-pump system, the current operating status of each water pump can be grasped in time, thus preparing for subsequent precise control. According to the preset water supply demand curve and the current actual water use situation, the total target flow and pressure of the multi-pump system can be determined to ensure the stability of the water supply pressure and flow. Then, by establishing a multi-pump linkage control model and determining the operating frequency of each water pump according to the water supply demand, variable frequency speed control can be realized, so that the water pump can meet the flow and pressure requirements while avoiding the energy loss caused by interception in the traditional multi-pump system, thereby improving the operating efficiency of the water pump.

[0133] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0134] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for controlling efficient operation of multi-pump linkage without shutoff, characterized in that: The method is a multi-pump linkage control method with high efficiency and no-interception operation based on the established multi-pump linkage control model and variable frequency speed control according to water supply demand; The non-interception multi-pump linkage efficient operation control method comprises the following steps: Step 1: Monitor the operating parameters of each water pump in the multi-pump system in real time, including but not limited to flow rate, pressure, power and speed; Step 2: Determine the total target flow and pressure of the multi-pump system based on the preset water supply demand curve and the current actual water usage; Step 3: Using the established multi-pump linkage control model, combined with the real-time operating parameters of each water pump as well as the total target flow and pressure, the operating frequency of each water pump is obtained based on the corresponding relationship between the water pump frequency and flow, pressure and power in the multi-pump linkage control model; Step 4: Perform variable frequency speed control on each water pump according to the obtained operating frequency to achieve multi-pump linkage operation without flow interruption; In terms of digital control, the operating status of each water pump is monitored in real time. When a water pump deviates from the optimal operating point and its efficiency is lower than 85% of the rated efficiency, it automatically determines whether to adjust the pump group configuration and enable a reasonable combination of large and small pumps.

2. A method for controlling efficient operation of multiple pumps without shutoff according to claim 1, characterized in that: The step 2 includes the following steps: Collect and analyze historical water use data, including water flow and pressure requirements over different time periods. Based on the collected data, draw a water supply demand curve that reflects the dynamic changes in water demand. Real-time monitoring of actual water usage data. Flow and pressure digital sensors installed in the water supply network can be used to obtain real-time water flow and pressure data. The installed digital sensors cover the entire water supply area. Compare and analyze the current actual water usage data with the preset water supply demand curve to evaluate the deviation between the current water usage and the preset demand. If the deviation exceeds the set threshold, the total target flow and pressure of the multi-pump system need to be readjusted; Based on the deviation analysis results and the actual situation of the water supply system, the total target flow and pressure of the multi-pump system are determined.

3. A method for controlling efficient operation of multiple pumps without shutoff according to claim 2, characterized in that: Compare and analyze the current actual water usage data with the preset water supply demand curve, including: The current real-time monitored water flow and pressure data are compared point by point with the flow and pressure values ​​on the corresponding preset water supply demand curve, and the deviation value is calculated, specifically: For flow rate, the difference between the actual flow rate and the preset flow rate is divided by the preset flow rate to obtain the flow rate deviation percentage; For pressure, the difference between the actual pressure and the preset pressure is divided by the preset pressure to obtain the pressure deviation percentage; Pre-set the deviation threshold, and determine the flow deviation threshold and pressure deviation threshold based on the actual operation experience and water supply requirements of the water supply system. The flow deviation threshold is 10% and the pressure deviation threshold is 5%; Compare the calculated deviation value with the preset threshold, and filter out the time point when the deviation exceeds the threshold and the corresponding deviation value; Conduct a preliminary assessment of the deviation, including statistically analyzing the frequency, duration, and degree of deviation exceeding the threshold, to determine whether the deviation between the current water use situation and the preset demand is a short-term fluctuation or a continuous deviation.

4. The method for controlling efficient operation of multi-pump linkage without shutoff according to claim 1, characterized in that: The step three includes the following steps: Collect the pump performance data of the multi-pump system, including the performance curve, model, specifications and rated parameters of each pump. The collected pump performance data will serve as the basic data for building the model, and outliers and erroneous data will be eliminated; Based on the collected water pump performance data, a multi-pump linkage control model is established. The established multi-pump linkage control model comprehensively considers the relationship between the flow rate, pressure and power of multiple water pumps at different operating frequencies; Input the operating parameters of each water pump monitored in real time in step 1 into the multi-pump linkage control model. At the same time, the total target flow and pressure of the multi-pump system determined in step 2 are used as constraints of the multi-pump linkage control model. According to the corresponding relationship between the water pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, combined with the real-time working parameters and the total target flow and pressure, the operating frequency of each water pump is determined.

5. The method for controlling efficient operation of multiple pumps without shutoff according to claim 4 is characterized in that: Determine the operating frequency of each pump, including: Based on the corresponding relationship between the pump operating frequency and flow, pressure and power reflected in the multi-pump linkage control model, the mutual influence of each pump is analyzed to clarify the change pattern of each parameter under different operating frequencies; Then, based on the constraints of the total target flow and pressure, combined with the above correspondence and real-time working parameters, the initial operating frequency of each water pump is determined; After determining the preliminary operating frequency, the multi-pump linkage control model is used for verification. The real-time monitored operating parameters of each pump are used as model inputs to verify the pump operating frequency according to the determined operating frequency. Observe whether the flow and pressure output by the model are stable near the total target value, whether the operation status of each pump is normal, and whether the power fluctuation is within a reasonable range; If the verification is passed, the final operating frequency of each water pump is determined.

6. The method for controlling efficient operation of multiple pumps without shutoff according to claim 4, characterized in that: Collect pump performance data for multi-pump systems, including: Collect the pump performance data of each pump, and organize and verify the collected pump performance data, specifically: Data collation: collate the performance curve data, model specifications and rated parameters of different pumps into a unified database or data structure to ensure consistent data format; Data verification: Verify the collected pump performance data, check the completeness and accuracy of the pump performance data, and promptly correct or supplement any errors or missing data found.

7. The method for controlling efficient operation of multiple pumps without shutoff according to claim 1, characterized in that: The step 4 includes the following steps: Each water pump is equipped with a variable frequency speed control device to adjust the speed of the motor according to the control signal; According to the operating frequency obtained in step 3, a corresponding control signal is generated and sent to the variable frequency speed control device of each water pump; After receiving the control signal, the variable frequency speed regulating device performs variable frequency speed regulation on the water pump motor according to the frequency indicated by the control signal, and monitors the running status of the water pump in real time during the speed regulation process; Real-time monitoring of the operation of the entire multi-pump system, including the flow, pressure, power and other parameters of each pump, as well as the pressure and flow of the water supply network; Based on the monitoring data, the status of the multi-pump linkage operation is evaluated. If it is found that the actual operation status deviates from the expected optimal operation status, the information is fed back to the monitoring end in a timely manner, and step three is recalculated and adjusted.

8. The method for controlling efficient operation of multiple pumps without shutoff according to claim 1, characterized in that: In the step 1, various digital sensors are installed at key positions of the multi-pump system, and the operating parameters of each water pump are monitored in real time through the installed various digital sensors. The operating parameters monitored by the digital sensors are collected according to the set data acquisition frequency. At the same time, the multi-pump system is also equipped with redundant water pumps, and the operating status of each water pump is evaluated in real time using an intelligent health assessment model, and the operating time and load are reasonably allocated. In the event of a fault or maintenance, the system automatically switches to the redundant water pump and isolates the faulty water pump to issue an alarm, and at the same time feeds back the fault information to the maintenance personnel.

9. A method for controlling efficient operation of multiple pumps without shutoff according to claim 8, characterized in that: Collecting the working parameters monitored by the digital sensor according to the set data collection frequency includes the following steps: Conduct a comprehensive analysis of the operating conditions of the multi-pump system to clarify the characteristics of different operating stages and the requirements for real-time data; According to different working parameters, determine the reasonable acquisition frequency range, specifically: For flow and pressure parameters, set the data acquisition frequency to 5-20 times per second; For power and speed parameters, set the data collection frequency to about 1-5 times per second; The data collection frequency is adjusted according to the problems encountered in actual applications and changes in demand. For example, when the multi-pump system encounters abnormal operating conditions or is undergoing maintenance and debugging, the data collection frequency is temporarily increased to obtain more detailed parameter change information. When the multi-pump system operates stably for a long time and there are no special needs, data collection is performed according to the above-set data collection frequency.

10. The method for controlling efficient operation of multiple pumps without shutoff according to claim 8, characterized in that: Automatic switchover to redundant pumps in case of failure or maintenance involves the following steps: Based on the real-time monitoring data of digital sensors, combined with the historical operation data and performance curve of the water pump; Use a pre-built intelligent health assessment model to conduct real-time assessments of each pump's operating status, including vibration, temperature changes, and efficiency changes; Based on the health assessment results, the operating time and load of each pump are reasonably allocated, including giving priority to pumps in good health to bear more loads, while appropriately reducing the operating time of pumps in less healthy conditions, rotating the operation, and balancing the wear of each pump; When a water pump fails or requires maintenance, it automatically detects the fault signal and immediately issues a command to switch to the redundant water pump; At the same time, the faulty water pump is isolated through the solenoid valve or electric valve isolation device, and the connection between the faulty water pump and the main pipeline of the multi-pump system is cut off; The fault information is promptly fed back to the monitoring end through wired or wireless communication and a maintenance work order is generated and distributed to the maintenance personnel. The maintenance personnel will maintain the faulty water pump according to the distributed maintenance work order.

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