Digital pump water supply control method, system and equipment based on pressure and flow

Abstract

The invention discloses a digital pump water supply control method, system and equipment based on pressure and flow, and relates to the field of digital pump water supply.The method comprises the steps that historical water consumption data of a user in a water supply network in different time periods are obtained, and the historical water consumption data comprise the water outlet pressure and the water outlet flow of the water outlet end of a water supply unit; constructing a water demand data model based on the historical water consumption data, and predicting target pressure and target flow of the user at different time points in a first preset time period through the water demand data model; generating a water demand instruction based on the target pressure and the target flow, the water demand instruction comprising a mapping relationship between the target pressure and time and a mapping relationship between the target flow and time; and the common pump and / or the standby pump are / is started through the water demand instruction, and the water outlet pressure and the water outlet flow of the water supply unit are controlled through the common pump and / or the standby pump. The problem that the water supply amount is insufficient due to the fact that the water consumption of the user cannot be accurately controlled and predicted is solved.

Description

Technical Field

[0001] The present application relates to the field of digital pump water supply, and in particular to a pressure and flow-based digital pump water supply control method, system and equipment. Background Art

[0002] In the secondary water supply system, a constant pressure water supply method is usually adopted, that is, by setting a target pressure value, the water supply unit is allowed to perform PID constant pressure adjustment according to this target pressure. In this way, the outlet pressure of the water supply unit will always be maintained within the set target pressure range. However, in actual application, some factors may cause the pressure of the end user of the pipeline network to be sufficient, but the flow is insufficient. For example, aging and blockage of the transmission pipeline is a common problem. For some old communities, the transmission pipeline may produce scale, impurities, etc. after a long period of use, which will have a negative impact on the water supply flow. In addition, the pipeline may leak at the connection, which will further reduce the water supply flow, resulting in the end user feeling enough pressure, but the water flow is actually insufficient.

[0003] In response to the above problems, the existing secondary water supply system often requires more manual monitoring and operation, which increases the management and maintenance costs and is unable to accurately control and predict the user's water consumption. Summary of the invention

[0004] The purpose of this application is to provide a digital pump water supply control method, system and equipment based on pressure and flow, which can accurately control and predict the user's water consumption.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a digital pump water supply control method based on pressure and flow, comprising:

[0007] Obtaining water consumption data of users in the water supply network in different time periods, wherein the water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit, wherein the water supply unit includes a common pump and a standby pump;

[0008] Preprocessing the water consumption data;

[0009] Building a water demand data model based on the preprocessed water consumption data, and predicting the target pressure and target flow rate of the user at different time points within a first preset time period through the water demand data model;

[0010] generating a water demand instruction based on the target pressure and the target flow rate, the water demand instruction including a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time;

[0011] The common pump and / or the standby pump are started by the water demand instruction, and the water outlet pressure and water outlet flow rate of the water supply unit are controlled by the common pump and / or the standby pump.

[0012] In a second aspect, the present application provides a digital pump water supply control system based on pressure and flow, comprising:

[0013] An acquisition module is used to acquire water consumption data of users in the water supply network in different time periods, wherein the water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit, and the water supply unit includes a common pump and a standby pump;

[0014] A preprocessing module, used for preprocessing the water consumption data;

[0015] A prediction module, configured to construct a water demand data model based on the preprocessed water consumption data, and predict the target pressure and target flow rate of the user at different time points within a first preset time period through the water demand data model;

[0016] A generating module, configured to generate a water demand instruction based on the target pressure and the target flow rate, wherein the water demand instruction includes a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time;

[0017] A starting module is used to start the common pump and / or the standby pump according to the water demand instruction, and control the water outlet pressure and water outlet flow of the water supply unit through the common pump and / or the standby pump.

[0018] In a third aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any one of the pressure and flow-based digital pump water supply control methods described above.

[0019] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0020] The present application provides a digital pump water supply control method, system and equipment based on pressure and flow, by obtaining the water consumption data of users in the water supply network in different time periods, the water consumption data includes the water outlet pressure and water outlet flow at the water outlet end of the water supply unit, and the water supply unit includes a common pump and a standby pump; preprocessing the water consumption data; constructing a water demand data model based on the preprocessed water consumption data, and predicting the target pressure and target flow of the user at different time points in the first preset time period through the water demand data model; generating a water demand instruction based on the target pressure and target flow, the water demand instruction includes a mapping relationship between the target pressure and time, and a mapping relationship between the target flow and time; starting the common pump and / or the standby pump through the water demand instruction, and controlling the water outlet pressure and water outlet flow of the water supply unit through the common pump and / or the standby pump. The present application realizes the intelligent management of the water supply system by controlling the water outlet pressure and water outlet flow of the water supply unit. The system can automatically adjust the operating state of the water supply unit according to the water demand demand of users in different time periods, thereby ensuring the stability and reliability of water supply. By constructing a water demand data model, accurate prediction of user water demand is achieved. At the same time, the system reduces the frequency and intensity of manual intervention and improves water supply efficiency and management level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is an application environment diagram of a digital pump water supply control method based on pressure and flow in one embodiment of the present application;

[0023] Figure 2 A flow chart of a digital pump water supply control method based on pressure and flow provided in one embodiment of the present application;

[0024] Figure 3 A schematic diagram of functional modules of a digital pump water supply control system based on pressure and flow provided in one embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] The digital pump water supply control method based on pressure and flow provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send the water consumption data of different time periods to be processed to the server 104. After the server 104 receives the water consumption data of different time periods to be processed, the server 104 builds a water demand data model based on the water consumption data, and predicts the user's target pressure and target flow at different time points in the first preset time period through the water demand data model; generates a water demand instruction based on the target pressure and target flow; starts the common pump and / or the standby pump through the water demand instruction, and controls the water outlet pressure and water outlet flow of the water supply unit through the common pump and / or the standby pump. The server 104 can feedback the obtained water demand instruction to the terminal 102. In addition, in some embodiments, the digital pump water supply control method based on pressure and flow can also be implemented by the server 104 or the terminal 102 alone, such as the terminal 102 can directly process the water demand instruction to be processed, or the server 104 can obtain the water demand instruction to be processed from the data storage system and process the water demand instruction to be processed, wherein the terminal 102 can be but not limited to PLC. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers, and can also be a cloud server. The terminal 102 transmits the data collected by the pressure sensor, flow meter, water pump, etc. to the server 104 through the network.

[0029] The water supply unit is the central hub of the entire water supply system. The water supply unit consists of one or more water pumps, including common pumps and standby pumps. The water pumps are responsible for pressurizing water from the water source to the residential water pipes. The water supply unit is directly connected to the residential water pipes and delivers pressurized water to users through a pipeline network. The common pump and the standby pump are integrated inside the water supply unit, and the working state is automatically switched according to actual needs. The common pump is the main working pump in the water supply system, usually used to maintain a constant pressure water supply. The common pump is installed in the water supply unit, which is directly connected to the input end of the water supply unit to receive water from the water source. The output end of the common pump is connected to the residential water pipe to ensure that the water flow can reach the end user. The common pump can also be connected in series or parallel with the standby pump so that they can work together when needed.

[0030] As part of the redundant design, the backup pump starts when the normal pump fails or the flow is insufficient to provide additional flow support. The backup pump is also located inside the water supply unit. It is installed in parallel with the normal pump and connected to the residential water pipe through the same pipe network. The backup pump can automatically start when the normal pump cannot meet the water demand to ensure uninterrupted water supply. The residential water pipe is a branch network extending from the water supply unit to each user, responsible for distributing pressurized water to each household or unit. The residential water pipe starts from the output end of the water supply unit and forms a branch structure to cover all areas where water supply is required. Each branch terminal is connected to a specific user entry point, such as a residential building, commercial building, etc.

[0031] The monitoring equipment is used to measure and monitor the operating parameters of the water supply system, such as pressure and flow, in real time to ensure that the system is in the best working condition. The monitoring equipment is installed at the outlet of the water supply unit and the key nodes of the residents' water pipes, such as the main pipe and branch pipe entrance. The monitoring equipment communicates with the data platform through wired or wireless means, transmits the collected data in real time, and provides a decision-making basis for the control system.

[0032] In an exemplary embodiment, Figure 2 As shown, a digital pump water supply control method based on pressure and flow is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used as an example to illustrate the method, which includes the following steps S201 to S204. Among them:

[0033] In step S201, water consumption data of users in the water supply network in different time periods are obtained. The water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit. The water supply unit includes a common pump and a standby pump.

[0034] Specifically, the water supply unit includes at least one common pump and one standby pump, and both the common pump and the standby pump in this application belong to digital pumps. The current flow data and pressure data are continuously monitored and collected by sensors installed in the water supply network. For example, the pressure data can be monitored and collected by a pressure sensor, and the flow data can be monitored and collected by a flow meter. The water supply unit adopts a configuration of a common pump + a standby pump, including but not limited to one for use and one for standby, two for use and one for standby, and three for use and one for standby. One for use and one for standby means that a common pump is used for daily water supply, and a standby pump is used as redundancy to start when the common pump fails or the flow is insufficient. Two for use and one for standby means that two common pumps work in turn or at the same time to meet the larger water demand, and a standby pump is used for emergency or flow supplement. Three for use and one for standby means that three common pumps share the water supply task, which is suitable for larger scale or higher demand scenarios, and a standby pump ensures system redundancy. Common pumps focus on selecting pressure-type water pumps, which can provide sufficient height and are suitable for high-rise buildings or multi-layer water supply systems. The pressure-type water pump is equipped with a PID controller to automatically adjust the speed to keep the outlet water pressure stable. The backup pump focuses on selecting a flow-type water pump that can provide a large amount of water flow in a short period of time to quickly make up for the insufficient flow of the common pump. Flow-type water pumps usually use PID flow control to adjust the output flow according to actual needs.

[0035] For example, the PID control formula is as follows:

[0036]

[0037] Among them, u(x) represents the controller output signal, that is, the control instruction to the water supply unit, such as adjusting the speed of the pump. Kp represents the proportional gain, which indicates the degree of influence of the error e(t) on the controller output. The proportional gain determines the instantaneous response speed of the controller to the current error. e(t) represents the error signal, which is defined as the difference between the set value (target pressure or target flow) and the actual measured value. e(t) = SP-PV, where SP is the set value and PV is the process variable (actual measured value). It is the reciprocal of the integral time constant and indicates the degree of influence of the integral term on the controller output. The role of the integral term is to eliminate steady-state errors and ensure long-term stability. Ti represents the integral time constant. A larger Ti value means a weaker integral action, and a smaller Ti value means a stronger integral action. T dis the differential time constant, which indicates the influence of the differential term on the controller output. The role of the differential term is to predict the future error change trend, so as to make adjustments in advance and improve the dynamic response performance of the system. In the secondary water supply system, PID control immediately adjusts the pump speed or other control parameters according to the current error e(t) to quickly respond to changes in pressure or flow. The steady-state error is eliminated by accumulating past errors to ensure that the water supply pressure or flow remains stable for a long time. The control parameters are adjusted in advance by predicting the rate of change of the error, reducing overshoot and oscillation and improving the dynamic response performance of the system.

[0038] Assuming that in the secondary water supply system, the target pressure setting value is SP, and the actual measured pressure is PV, then the error e(t) = SP-PV. The PID controller will adjust the pump speed based on this error and its integral and differential values ​​to make the actual pressure close to the set value and remain stable. By setting the values ​​of Kp, Ti and Td, the water supply system can be accurately controlled to ensure that the pressure and flow at the user end meet the requirements.

[0039] The common pump and the standby pump together form a complete unit system. They are all under the unified control of the same PLC (Programmable Logic Controller). Therefore, the outlet pressure of the common pump and the standby pump is detected by the same detection system. The outlet flow rate is achieved by directly monitoring the flow rate on the unit outlet main pipe. This flow rate value actually represents the total flow rate generated by the two pumps working together.

[0040] When analyzing the urban water supply system, the specific situation of water demand can be understood by observing the flow rate of the pipe network. The size of the pipe network flow directly reflects the amount of water used by residents or industries. When the flow rate is large, it means that the water demand is correspondingly high. Pressure is an important indicator of the force exerted by the water pump to deliver water to the user. For example, in a scenario where no user uses water, it can be imagined as a closed pipe. At this time, to deliver water to the highest floor of the building, the water pump needs to provide a pressure of about 0.4 megapascals (Mpa). However, once a user in the pipe network starts to use water, the situation changes. At this time, the originally closed pipe is equivalent to an opening, and the original 0.4Mpa pressure is no longer sufficient. The water pump must output more power to meet the new water demand.

[0041] The outlet water pressure indicates the head of the outlet water of the unit, which determines the height to which the water can be delivered. The flow rate indicates how much water the system can deliver per unit time. Within a specific water supply range, for example, when providing water supply services for a building, the required water pressure and the required flow rate have been calculated during the design phase of the building. Therefore, when selecting and configuring water supply equipment, the model will be selected based on the design data. In short, the pressure determines how high the water can be delivered to the building, and the flow rate ensures that the water demand of all users in the building can be met.

[0042] In step S202, a water demand data model is constructed based on historical water consumption data, and the target pressure and target flow rate of the user at different time points within a first preset time period are predicted by the water demand data model.

[0043] In one embodiment, before the step of building a water demand data model based on the water consumption data, the water consumption data needs to be preprocessed. The preprocessing of the water consumption data includes the following sub-steps A1-A4:

[0044] A1. Filter the historical water consumption data.

[0045] Specifically, a low-pass filter, a high-pass filter or a band-pass filter is applied to eliminate high-frequency noise or low-frequency drift. A smoothing algorithm such as a moving average method or an exponentially weighted moving average (EWMA) is used to reduce short-term fluctuations. The signal is decomposed into different frequency components by wavelet decomposition, retaining the main information and removing noise. Assuming that the pressure data recorded in a certain period of time contains high-frequency noise, the signal is decomposed into multiple frequency components using wavelet transform, retaining only the low-frequency part, thereby obtaining a smoother pressure curve.

[0046] A2. Remove outliers from the filtered historical water consumption data.

[0047] Based on statistical methods such as mean, standard deviation, and interquartile range (IQR), data points outside the normal range are identified. For example, in the traffic data of a time period, a peak value much higher than other data points appears. By calculating the interquartile range (IQR) of all data points in the time period, the peak value is determined to be an outlier and is removed.

[0048] A3. Align the historical water consumption data after removing outliers according to timestamps to ensure the time synchronization of the historical water consumption data.

[0049] Specifically, the time format of all water consumption data is unified through timestamps to ensure data consistency and comparability. For missing time points, linear interpolation, spline interpolation or forward / backward filling methods are used to complete the data. Set a fixed time interval (such as every minute, every hour) and resample the data to ensure that each time point has a corresponding data value. For example, if there are missing data at certain time points in the original data, a reasonable estimate is inserted between two known data points through linear interpolation to make the data series complete and continuous.

[0050] A4. Extract feature values ​​from the water consumption data aligned according to timestamps to obtain historical water consumption data after feature value extraction.

[0051] Specifically, key features are extracted from the original data to build a water demand data model. The real-time pressure and real-time flow at the water outlet are directly extracted from the aligned water outlet feature data as core features. Assuming that the pressure and flow data are recorded once a minute within a certain hour, 60 pressure values ​​and 60 flow values ​​within the hour are extracted as real-time features. Timestamp information such as date, hour, and day of the week are extracted, and specific date information (such as 2024-01-01) is extracted to help identify the water use pattern on a specific day. Data is extracted for each hour to capture changes in water use during different time periods of a day. Data is extracted for each hour to capture changes in water use during different time periods of a day. For example, by extracting the "day of the week" information in the timestamp, it can be found that the water use on weekdays from Monday to Friday is usually higher than that on Saturday and Sunday. Moving average and rolling window statistics (such as maximum, minimum, and standard deviation) are calculated to reflect short-term trends. The cross term between flow and pressure is constructed to obtain the interaction between the two. For example, pressure × flow is constructed as a new feature to reflect the impact when both increase or decrease at the same time. The maximum flow, minimum flow and average flow per hour are extracted from the aligned data and input into the water demand data model as feature values ​​to more accurately predict future water demand.

[0052] In one embodiment, a water demand data model is constructed based on the water consumption data, and the target pressure and target flow rate of the user at different time points in the first preset time period are predicted by the water demand data model, including the following sub-steps S2021-S2024:

[0053] S2021. Divide the preprocessed historical water consumption data into a training set, a validation set, and a test set, input the training set into the initial model for training, and obtain a trained water demand data model.

[0054] Specifically, the data first need to be divided into different subsets, namely: training set, test set and validation set. The training set is used for model learning and training, accounting for about 60%-80%, to ensure that the model has enough data for learning and avoid overfitting. The test set is used to make a preliminary evaluation of the model performance after the model training is completed, accounting for about 10%-20%. The validation set is used to evaluate the final performance of the model to monitor the performance of the model on unknown data, accounting for about 10%-20%, to ensure that there is enough data for verification during the model training process. In order to simplify the data division process, the train_test_split function in the model_selection module provided by the sklearn library in the Python programming language can be used to quickly and randomly divide the data set into training and test sets.

[0055] It can be understood that the training set is used to train the model. During the training process, the model will continuously learn these sample data, identify and extract the features and patterns therein. Through repeated iterations and optimization on the training set, the model can gradually grasp the regularity in the data and establish preliminary prediction capabilities. The test set is used to evaluate the generalization ability of the model, that is, the model's prediction ability for new data. After the model is trained, the generalization ability of the model on unseen data can be tested by testing the model on the test set. It can provide a relatively objective evaluation standard to measure the performance of the model in practical applications. The role of the validation set is to adjust parameters during the model training process. The data of the validation set also comes from the original data, but they are neither involved in the training of the model nor used for the final performance test, but serve as a reference standard for model tuning. The evaluation of the validation set can more objectively reflect the true performance of the model.

[0056] S2022. Adjust the water demand data model based on the test set to obtain an adjusted water demand data model.

[0057] Specifically, after obtaining the water demand data model through training, in order to make the model output more accurate, the model needs to be further adjusted and optimized. By fine-tuning the model parameters, it can be ensured that the model can more accurately generate the qualification category and qualification level required for the project based on the project profile, thereby providing more reliable decision-making support for the tenderer.

[0058] S2023. Evaluate the judgment model of the adjusted water demand data model based on the validation set.

[0059] Specifically, the deficiencies of the model identified during the evaluation process are adjusted and the training data set is adjusted. In addition, in order to ensure that the performance of the model in practical applications can continue to improve, the validation set needs to be updated regularly to capture the latest data trends and changes. By constantly repeating the above evaluation process, the model can be ensured to be in the best working condition.

[0060] S2024. Integrate the water demand data model into the water supply control system, input the newly acquired water consumption data of users in the water supply network into the water demand data model, and predict the target pressure and target flow of users at different time points in the first preset time period through the water demand data model.

[0061] Specifically, in the process of establishing a water demand data model, the model can obtain the user's water use pattern through historical water consumption data, and identify the morning and evening peak water consumption. The peak water consumption period is usually characterized by large flow data, indicating that more people use water at this time; relatively speaking, during the low water consumption period, the flow data is small, indicating that fewer people use water. The data platform is used to collect water use data within a preset time period, and to derive water use habits from the collected water use data. The longer the preset time, the deeper the understanding of the user's water use habits, which is conducive to accurately predicting the flow data and pressure data at a certain moment in the future, so predicting the flow is relatively direct.

[0062] Since the collected flow data directly reflects the actual water consumption of users, time series prediction models (such as ARIMA, LSTM) can be used to perform short-term and long-term predictions of the water flow. The predicted pressure involves multiple factors such as the head of the entire building, the designed rated flow, and the actual water flow. For example, the rated head of a building has been determined during the design, assuming that the head is 40 meters (equivalent to 0.4 megapascals). For example, the design head of a high-rise building is 0.4MPa. During the low-peak period of water consumption, if the pressure of 0.4MPa seems too abundant, in order to achieve energy saving, the pressure can be appropriately reduced. The model needs to calculate how much the pressure should be reduced to ensure that the end user still has sufficient water pressure.

[0063] For example, the daily water usage pattern of a community can be obtained through water consumption data:

[0064] Morning peak: usually occurs between 6:00 and 9:00 in the morning, when residents prepare to go to work or school, and water consumption increases significantly.

[0065] Lunch period: From 12:00 noon to 14:00, some households may experience a brief increase in water usage.

[0066] Evening peak: From 18:00 to 21:00 in the evening, water demand rises again after residents return home.

[0067] The water usage pattern during holidays is as follows:

[0068] Weekends: Compared to weekdays, water use is more dispersed during the day, but overall water use is higher.

[0069] Legal holidays: such as Spring Festival and National Day, water usage patterns may be completely different from usual and require special attention.

[0070] For example, in a community, the average traffic volume reaches a peak of 50m / s between 7:00 and 8:00 in the morning on weekdays. 3 / h; during holidays, the flow rate during this period will be significantly reduced, but there may be higher water demand in the afternoon and evening.

[0071] During the model training phase, you can input a reduced pressure value and then observe the water use of the water supply network, especially whether the pressure at the end of the network drops to the lowest acceptable point. If the pressure drops below the lowest point, it means that the input reduced pressure value is too large and needs to be adjusted. Through repeated training and adjustment, the model will gradually optimize and eventually be able to accurately output the predicted target pressure and target flow values.

[0072] For example: In a certain experiment, the model suggested reducing the pressure from 0.4MPa to 0.35MPa. After a period of monitoring, it was found that the pressure at the end of the pipe network did drop to near the lowest acceptable point, but it still met user needs. Therefore, the model confirmed that 0.35MPa is a suitable energy-saving pressure value.

[0073] By using the above prediction model, accurate water demand forecasting can be achieved, especially during low-peak periods such as nighttime and holidays. By reasonably adjusting the pressure, not only the basic water needs of users are guaranteed, but also energy consumption is greatly reduced, saving operating costs.

[0074] In step S203, a water demand instruction is generated based on the target pressure and the target flow rate, and the water demand instruction includes a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time;

[0075] Specifically, the data obtained by the prediction model, such as the target pressure and the target flow, can be transmitted to the unit control system, and the control system adjusts the operating state of the water pump unit according to the target pressure and the target flow. The unit control system mainly processes or optimizes the mismatch between the pressure and flow of the pipeline network, especially when the flow is insufficient, and ensures that the equipment can operate more energy-efficiently and efficiently during off-peak hours. In the absence of data from the data platform, a set of preset original target pressure values ​​will be used inside the unit control system to perform the task of constant pressure water supply. This target pressure value is set according to the design target pressure of the pipeline network. The data sent by the platform is periodic, for example, the target pressure and target flow of the next time period are sent every 2 hours. In the process of using the platform to send data, if the operating status of the unit equipment deviates from the actual water use conditions (for example, the pressure of the outlet pipeline network continues to drop to the lower limit warning value of the pressure set by the unit control system), then the unit control system will quickly switch back to the original target pressure value to ensure the stability and safety of constant pressure water supply.

[0076] In step S204, the common pump and / or the standby pump are started by the water demand instruction, and the outlet water pressure and the outlet water flow of the water supply unit are controlled by the common pump and / or the standby pump.

[0077] In one embodiment, the above method further includes the following steps S2051-S2054:

[0078] S2051. Start the common pump according to the target pressure in the water demand instruction.

[0079] S2052: Monitor the water outlet pressure and water outlet flow rate within a first preset time period.

[0080] S2053: If the water outlet pressure in the first preset time period is greater than or equal to the target pressure, and the water outlet flow rate in the first preset time period is greater than or equal to the target flow rate, control the common pump to operate according to the current frequency and constant pressure water supply mode.

[0081] S2054: If the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow rate in the first preset time period is less than the target flow rate, control the common pump to change from the constant pressure variable frequency mode to the fixed frequency mode.

[0082] Specifically, the method for obtaining the operating frequency of the fixed frequency mode includes the following sub-steps B1-B2:

[0083] B1. After starting the common pump, if the water outlet pressure within the first preset time period is greater than or equal to the target pressure, and the water outlet flow rate within the first preset time period is less than the target flow rate, then start timing.

[0084] B2. After the second preset time period has passed, obtain the operating frequency of the fixed-frequency mode of the current common pump.

[0085] Specifically, the system starts the common pump according to the water usage demand instruction. Within the first preset time period, continuously monitor whether the water outlet pressure is greater than or equal to the target pressure H1. At the same time, monitor whether the water outlet flow rate is less than the target flow rate L1. If within the first preset time period, the water outlet pressure ≥ H1 and the water outlet flow rate < L1, then start timing. Assume that after the common pump is started, within the first preset time period (such as 2 minutes), the water outlet pressure reaches 0.4 MPa (target pressure), but the water outlet flow rate is only 30 m 3 / h (lower than the target flow rate of 50 m 3 / h). At this time, the system starts timing and enters the next step. If the water usage demand continues to increase within the T1 time and the water supply unit cannot respond in time, it may lead to insufficient water pressure or poor water flow at the user end, affecting the user experience. T1 is the second preset time period. If the T1 time is set too short, the water supply unit will be too sensitive, and for sporadic water usage (such as late-night toilet flushing in the bathroom, short-time handwashing at the faucet), it will cause frequent pump addition, increasing unnecessary energy consumption and equipment wear. Set the T1 time according to the actual application scenario and historical data to balance the response speed and energy consumption control. For example, T1 can be set between 1 and 3 minutes, and the specific value can be fine-tuned according to different scenarios. Assume that in the above situation, T1 is set to 2 minutes. During this time, if the water usage demand continues to increase beyond the level of sporadic water usage, the system will obtain the operating frequency of the current common pump after 2 minutes, switch to the fixed-frequency mode, and start the standby pump to supplement the flow rate.

[0086] Exemplarily, assume that a certain community water supply system detects the following situation at a certain moment:

[0087] The system starts the common pump according to the water usage demand instruction.

[0088] Monitoring in the first preset time period: Within the first 2 minutes, it is found that the water outlet pressure is 0.4 MPa (meeting the target pressure), but the water outlet flow rate is only 30 m 3 / h (lower than the target flow rate of 50 m 3 / h). At this time, the system starts timing.

[0089] Second preset time period T1: After 2 minutes, the system obtains the operating frequency of the current common pump P1 = 40 Hz.

[0090] The system switches the common pump to the fixed frequency mode and starts the standby pump to supplement the flow to ensure that the total flow reaches the target value L1. In this way, the problem of poor user water experience or increased energy consumption caused by improper T1 setting can be effectively avoided, which can not only ensure the timely response of the water supply system, but also avoid unnecessary frequent pumping, thereby achieving energy saving and consumption reduction and efficient management.

[0091] S2055: Start the standby pump and adjust the water outlet flow rate so that the water outlet flow rate in the first preset time period is greater than or equal to the target flow rate.

[0092] In one embodiment, after starting the common pump and / or the standby pump by the water demand instruction, the digital pump water supply control method based on pressure and flow further includes the following steps C1-C3:

[0093] C1. Real-time monitoring of the water outlet pressure of the water supply unit;

[0094] C2. If the outlet water pressure is less than or equal to the pipeline high pressure protection pressure, the common pump is controlled to operate in a fixed frequency mode, and the standby pump is controlled to adjust the outlet water flow rate;

[0095] C3. If the outlet water pressure is greater than the pipeline high-pressure protection pressure, the commonly used pump is controlled to operate at a reduced frequency, and the standby pump is controlled to reduce the flow output or suspend flow compensation.

[0096] In one embodiment, controlling the common pump to operate at reduced frequency includes:

[0097] The frequency of the commonly used pump is controlled to be reduced in a step-by-step manner until the water outlet pressure of the commonly used pump is less than or equal to the pipeline high-pressure protection pressure.

[0098] In the selection process of water pumps, there are two key rated head (pressure) and rated flow. The rated head is mainly used to determine how high the water pump can deliver water, while the rated flow is related to how much water the water pump can deliver per unit time. When selecting a standby pump, people usually tend to choose a pump with lower head but higher flow. Because by adjusting the angle of the impeller blades inside the water pump, the flow and head of the water pump can be adjusted. Increasing the angle of the impeller blades can effectively increase the flow of the water pump while reducing its head; conversely, reducing the angle of the impeller blades will increase the head of the water pump but reduce its flow. Therefore, after the standby pump is started, the flow of the outlet pipe network of the entire unit will increase significantly, and the outlet water pressure may also increase accordingly. However, since the standby pump itself is designed as a low-head and high-flow water pump, the proportion of flow increase is usually greater than the proportion of pressure increase. If the outlet water pressure increases to exceed the high-pressure protection pressure Hmax, the normal pump will begin to operate at a step-by-step frequency reduction of △P. In this case, the flow gap caused by the reduced △P frequency of the normal pump will be promptly supplemented by the standby pump to ensure the stable operation of the entire system.

[0099] The operating frequency of the common pump was originally controlled by PID regulation. Now when it needs to be converted to fixed frequency operation mode, its operating frequency is set to 40HZ. At this time, once the standby pump is started and the outlet water pressure is detected to exceed the set high pressure protection pressure Hmax, the common pump needs to start to reduce its operating frequency. In order to achieve this process, a frequency reduction deviation value will be pre-set, represented by △P. After the first frequency reduction operation, the operating frequency of the common pump will be adjusted to 40HZ-△P. Usually, △P can be set to 5HZ, and △P can be between 3HZ and 5HZ. The principle of such setting is to be able to adjust the outlet water pressure step by step and slowly, so that it can naturally and smoothly reduce to the normal working pressure range. If △P is set too large, the fluctuation of the outlet water pressure will become very violent, which may affect the stability of the entire system. On the contrary, if △P is set too small, the adjustment of the outlet water pressure will become very slow, which will lead to a longer system response time and reduced efficiency. Therefore, it is necessary to adjust the value of △P according to the specific situation and requirements of the system to achieve the best control effect. The purpose of setting the pipeline high-pressure protection pressure is to prevent the pipeline network pressure from being too high, which may cause the pipeline network to burst. The Hmax setting can be greater than the user's water demand pressure and less than or equal to the maximum pressure that the pipeline network can withstand.

[0100] Based on the same inventive concept, the embodiment of the present application also provides a digital pump water supply control system based on pressure and flow for implementing the above-mentioned. The implementation scheme for solving the problem provided by the system is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more embodiments of the digital pump water supply control system based on pressure and flow provided below can refer to the limitations of the digital pump water supply control method based on pressure and flow above, and will not be repeated here.

[0101] In an exemplary embodiment, Figure 3 As shown, a digital pump water supply control system based on pressure and flow is provided, comprising:

[0102] An acquisition module 310 is used to acquire historical water consumption data of users in the water supply network in different time periods, wherein the historical water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit, and the water supply unit includes at least one common pump and a standby pump;

[0103] A prediction module 320, for building a water demand data model based on historical water consumption data, and predicting the target pressure and target flow rate of the user at different time points within a first preset time period through the water demand data model;

[0104] A generating module 330, configured to generate a water demand instruction based on the target pressure and the target flow rate, wherein the water demand instruction includes a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time;

[0105] The starting module 340 is used to start the common pump and / or the standby pump according to the water demand instruction, and control the water outlet pressure and water outlet flow of the water supply unit through the common pump and / or the standby pump.

[0106] As an optional implementation, the digital pump water supply control system based on pressure and flow is also used for:

[0107] Performing filtering processing on the water output data;

[0108] Performing outlier removal processing on the water outlet data after filtering;

[0109] Aligning the water output data after removing outliers according to timestamps to ensure time synchronization of the water output data;

[0110] Feature value extraction is performed on the water outlet data aligned according to timestamps to obtain water outlet feature data, wherein the water outlet feature data includes the real-time pressure and the real-time flow rate of the water outlet.

[0111] As an optional implementation, the startup module 340 is specifically configured to:

[0112] Starting a common pump according to the target pressure in the water demand instruction;

[0113] Monitoring the outlet water pressure and the outlet water flow rate within a first preset time period;

[0114] If the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow in the first preset time period is greater than or equal to the target flow, control the common pump to operate according to the current frequency and constant pressure water supply mode;

[0115] If the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow rate in the first preset time period is less than the target flow rate, the common pump is controlled to change from the constant pressure variable frequency mode to the fixed frequency mode;

[0116] The standby pump is started to adjust the water outflow rate so that the water outflow rate in the first preset time period is greater than or equal to the target flow rate.

[0117] As an optional implementation manner, in terms of the method for acquiring the operating frequency of the fixed frequency mode, the starting module 340 is specifically used to:

[0118] After the common pump is started, if the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow rate in the first preset time period is less than the target flow rate, then start timing;

[0119] After a second preset time period has passed, the operating frequency of the current common pump in the fixed frequency mode is obtained.

[0120] As an optional implementation, the digital pump water supply control system based on pressure and flow is also used for:

[0121] Real-time monitoring of the water outlet pressure of the water supply unit;

[0122] If the outlet water pressure is less than or equal to the pipeline high pressure protection pressure, the common pump is controlled to operate in the fixed frequency mode, and the standby pump is controlled to adjust the outlet water flow rate;

[0123] If the outlet water pressure is greater than the pipeline high-pressure protection pressure, the common pump is controlled to operate at a reduced frequency, and the standby pump is controlled to reduce flow output or suspend flow compensation.

[0124] As an optional implementation, the digital pump water supply control system based on pressure and flow is also used for:

[0125] The frequency of the commonly used pump is controlled to be reduced in a step-by-step manner until the water outlet pressure of the commonly used pump is less than or equal to the pipeline high-pressure protection pressure.

[0126] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store historical water consumption data of users in the water supply network in different time periods. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a digital pump water supply control method based on pressure and flow is implemented.

[0127] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0128] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0129] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0130] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0131] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0132] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0133] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0134] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A digital pump water supply control method based on pressure and flow, characterized in that: The digital pump water supply control method based on pressure and flow includes: Obtaining historical water consumption data of users in the water supply network at different time periods, wherein the historical water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit, wherein the water supply unit includes a common pump and a standby pump; Building a water demand data model based on the historical water consumption data, and predicting the target pressure and target flow rate of the user at different time points within a first preset time period through the water demand data model; generating a water demand instruction based on the target pressure and the target flow rate, the water demand instruction including a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time; The common pump and / or the standby pump are started by the water demand instruction, and the outlet water pressure and the outlet water flow rate of the water supply unit are controlled by the common pump and / or the standby pump.

2. The digital pump water supply control method based on pressure and flow according to claim 1 is characterized in that: Before the step of building a water demand data model based on the historical water consumption data, the pressure and flow-based digital pump water supply control method further includes: Performing filtering processing on the historical water consumption data; Performing a process of removing outliers on the historical water consumption data after the filtering process; Aligning the historical water consumption data after removing the outliers according to timestamps to ensure time synchronization of the historical water consumption data; Feature value extraction is performed on the historical water consumption data aligned according to timestamps to obtain the historical water consumption data after the feature value extraction.

3. The digital pump water supply control method based on pressure and flow according to claim 1 is characterized in that: The common pump and / or the standby pump are started by the water demand instruction, and the outlet water pressure and the outlet water flow rate of the water supply unit are controlled by the common pump and / or the standby pump, including: Starting a common pump according to the target pressure in the water demand instruction; Monitoring the water outlet pressure and the water outlet flow rate within the first preset time period; If the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow in the first preset time period is greater than or equal to the target flow, control the common pump to operate according to the current frequency and constant pressure water supply mode; If the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow rate in the first preset time period is less than the target flow rate, the common pump is controlled to operate in a constant pressure variable frequency mode to a fixed frequency mode; After controlling the common pump to change from the constant pressure variable frequency mode to the fixed frequency mode, the standby pump is started to adjust the water outlet flow rate so that the water outlet flow rate in the first preset time period is greater than or equal to the target flow rate.

4. The digital pump water supply control method based on pressure and flow according to claim 3 is characterized in that: The method for obtaining the operating frequency of the fixed frequency mode includes: After the common pump is started, if the outlet water pressure in the first preset time period is greater than or equal to the target pressure, and the outlet water flow rate in the first preset time period is less than the target flow rate, then start timing; After a second preset time period has passed, the operating frequency of the current common pump in the fixed frequency mode is obtained.

5. The digital pump water supply control method based on pressure and flow according to claim 4 is characterized in that: After starting the common pump and / or standby pump step by the water demand instruction, the pressure and flow-based digital pump water supply control method further includes: Real-time monitoring of the water outlet pressure of the water supply unit; If the outlet water pressure is less than or equal to the pipeline high pressure protection pressure, the common pump is controlled to operate in the fixed frequency mode, and the standby pump is controlled to adjust the outlet water flow rate; If the outlet water pressure is greater than the pipeline high-pressure protection pressure, the common pump is controlled to operate at a reduced frequency, and the standby pump is controlled to reduce flow output or suspend flow compensation.

6. The digital pump water supply control method based on pressure and flow according to claim 5, characterized in that: The controlling the commonly used pump to perform frequency reduction operation comprises: The frequency of the commonly used pump is controlled to be reduced in a step-by-step manner until the water outlet pressure of the commonly used pump is less than or equal to the pipeline high-pressure protection pressure.

7. The digital pump water supply control method based on pressure and flow according to claim 1, characterized in that: The water supply unit comprises at least one normal pump and one standby pump.

8. A digital pump water supply control system based on pressure and flow, characterized in that: The digital pump water supply control system based on pressure and flow includes: An acquisition module is used to acquire historical water consumption data of users in the water supply network in different time periods, wherein the historical water consumption data includes the water outlet pressure and water outlet flow rate of the water outlet of the water supply unit, and the water supply unit includes a common pump and a standby pump; A prediction module, used to build a water demand data model based on historical water consumption data, and predict the target pressure and target flow rate of the user at different time points within a first preset time period through the water demand data model; A generating module, configured to generate a water demand instruction based on the target pressure and the target flow rate, wherein the water demand instruction includes a mapping relationship between the target pressure and time, and a mapping relationship between the target flow rate and time; A starting module is used to start the common pump and / or the standby pump according to the water demand instruction, and control the water outlet pressure and water outlet flow of the water supply unit through the common pump and / or the standby pump.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the pressure and flow-based digital pump water supply control method described in any one of claims 1 to 7.

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