Diagonal flow pump blade angle control method and system, terminal and storage medium

Abstract

The invention relates to a diagonal flow pump blade angle control method and system, a terminal and a storage medium, and relates to the technical field of diagonal flow pump control, and the diagonal flow pump blade angle control method comprises the steps that a real-time load data set and a historical load data set of a preset unit are obtained; analyzing the real-time load data set and the historical load data set to determine a confidence fusion load; judging whether the confidence fusion load is greater than a preset first response threshold; if not, a preset water taking diagonal flow pump blade is controlled to supply water to a preset condenser at a preset basic water taking angle, and a preset water storage diagonal flow pump blade is controlled to store water into a preset water storage pond at a preset basic water storage angle; if yes, analyzing the confidence fusion load to control a preset water storage pond to supplement water to a preset condenser, and controlling the angle of a preset water storage diagonal flow pump blade and the angle of a preset water taking diagonal flow pump blade to supply water to the condenser. The diagonal flow pump has the effect of improving the load response capacity of the diagonal flow pump.

Description

Technical Field

[0001] This application relates to the technical field of mixed-flow pump control, and in particular to a method, system, terminal and storage medium for controlling the blade angle of a mixed-flow pump. Background Technology

[0002] Mixed-flow pump angle control refers to the process of dynamically adjusting the blade angle of the mixed-flow pump according to the unit's operating power, thereby changing the cooling water volume of the heat exchanger to match the unit's cooling requirements.

[0003] In related technologies, when controlling the angle of a mixed-flow pump, a power matching control method is usually adopted. By monitoring the unit's operating power, head, and medium temperature in real time, the target angle of the mixed-flow pump blades is determined based on the unit's real-time operating data, and the servo oil receiver is controlled based on the target angle of the blades to adjust the angle of the mixed-flow pump blades.

[0004] Regarding the aforementioned technologies, when controlling the blade angle of the mixed-flow pump based on the real-time operating power of the unit, after adjusting the blade angle to the target blade angle, the incremental water flow requires a certain lag time to take effect due to the complexity of the internal water supply pipeline of the unit, which leads to poor load response capability of the mixed-flow pump, and there is still room for improvement. Summary of the Invention

[0005] To improve the load response capability of a mixed-flow pump, this application provides a method, system, terminal, and storage medium for controlling the blade angle of a mixed-flow pump.

[0006] Firstly, this application provides a method for controlling the blade angle of a mixed-flow pump, employing the following technical solution: A method for controlling the blade angle of a mixed-flow pump includes: Acquire the real-time load data set and historical load data set of the preset generating units; Analyze real-time load data sets and historical load data sets to determine the confidence-based fused load; Determine whether the confidence fusion load is greater than the preset first response threshold; If it is not greater than, then control the preset water intake diagonal flow pump blades to supply water to the preset condenser at the preset basic water intake angle, and control the preset water storage diagonal flow pump blades to store water in the preset water storage tank at the preset basic water storage angle. If the load is greater than the specified value, the confidence fusion load is analyzed to control the water supply from the preset water storage tank to the preset condenser, and to control the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser.

[0007] Optionally, the steps of analyzing real-time load data sets and historical load data sets to determine confidence-based fused loads include: Input the historical load data set into the preset load forecasting model to determine the forecast load data set; Data is extracted from the real-time load data set to determine the overlapping and non-overlapping forecast data sets. Calculate the absolute deviation between the overlapping forecast data set and the real-time load data set to determine the absolute deviation sequence; Calculate the average of the absolute deviation sequence to determine the mean absolute deviation; The mean absolute deviation and the preset maximum unit load are input into the preset confidence assessment model to determine the prediction confidence. Calculate the average values ​​of the real-time load data set and the non-overlapping data set to determine the average real-time load and the average predicted load. The predicted confidence level, average real-time load, and average predicted load are input into a preset weighted fusion model to determine the confidence fusion load.

[0008] Optionally, the steps of analyzing the confidence-based fusion load to control the supply of water from the preset water storage tank to the preset condenser, and controlling the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser include: Determine whether the confidence fusion load is greater than the preset second response threshold; If it is not greater than, the confidence fusion load is analyzed to determine the first injection flow rate and the corrected storage angle; The water storage tank is controlled to replenish water to the condenser at the first water injection flow rate, and the water storage diagonal flow pump blades are controlled to store water in the water storage tank by correcting the water storage angle, and the water intake diagonal flow pump blades are controlled to supply water to the condenser at the preset basic water intake angle. If it is greater than that, the confidence fusion load is analyzed to determine the second injection flow rate and the corrected intake angle; Control the blades of the water intake diagonal flow pump to correct the water intake angle to supply water to the condenser, and control the water storage tank to replenish water to the condenser at a second water injection flow rate until the preset water flow lag time ends.

[0009] Optionally, the steps of analyzing the confidence-blended load to determine the first injection flow rate and the corrected storage angle include: Calculate the difference between the confidence fusion load and the preset first load lower limit to determine the current load span; Obtain the first load span; Calculate the ratio of the current load span to the first load span to determine the proportion of the first load. The first load percentage, the preset first flow upper limit, and the preset first flow lower limit are input into the preset water replenishment model to determine the first water injection flow rate; The initial water injection flow rate was analyzed to determine the corrected water storage angle.

[0010] Optionally, the step of analyzing the first injection flow rate to determine the corrected storage angle includes: Get the current water volume in the water storage tank; Calculate the difference between the preset rated water volume of the water storage tank and the current water volume of the water storage tank to determine the remaining storage capacity of the water storage tank; Calculate the quotient of the remaining storage capacity of the water storage tank and the rated water capacity of the water storage tank to determine the water storage tank surplus factor; The water storage correction factor is determined by looking up the water level correction factor in the preset water level correction table based on the water storage tank surplus factor. Calculate the product of the first injection flow rate, the reservoir capacity factor, and the storage correction factor to determine the first storage flow rate; The first water flow rate is input into a preset quadratic fitting model to determine the corrected water storage angle.

[0011] Optionally, the steps of analyzing the confidence-based fusion load to determine the second injection flow rate and the corrected intake angle include: Calculate the quotient between the confidence-integrated load and the preset maximum unit load to determine the flow adjustment ratio; Calculate the product of the preset maximum water intake flow rate and the flow rate adjustment ratio to determine the main pump water intake flow rate; Input the main pump's water intake flow rate into the preset cubic fitting model to determine the corrected water intake angle; The main pump intake flow rate is analyzed to determine the second injection flow rate.

[0012] Optionally, the step of analyzing the main pump intake flow rate to determine the second injection flow rate includes: Get the current pump flow rate and the real-time water volume in the storage tank; Calculate the difference between the main pump intake flow rate and the current pump flow rate to determine the pump flow rate deviation; Calculate the product of the pump flow rate deviation and the preset water intake lag time to determine the water demand of the storage tank; Determine whether the water demand of the water storage tank is greater than the real-time water volume of the water storage tank. If it is greater than that, calculate the quotient of the real-time water volume of the storage tank and the water intake lag time to determine the second water injection flow rate; If it is not greater than, then the pump water flow deviation is determined as the second injection water flow.

[0013] Secondly, this application provides a blade angle control system for a mixed-flow pump, which adopts the following technical solution: A mixed-flow pump blade angle control system, comprising: The acquisition module is used to acquire real-time load data sets and historical load data sets; A memory for storing a program for a method of controlling the blade angle of a mixed-flow pump as described in any of the preceding claims; The processor and the program in the memory can be loaded and executed by the processor to implement a method for controlling the blade angle of a mixed-flow pump as described in any of the above.

[0014] Thirdly, this application provides a smart terminal, which adopts the following technical solution: A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any of the preceding claims, a method for controlling the blade angle of a mixed-flow pump.

[0015] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates improving the load response capability of the co-current pump, and adopts the following technical solution: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed any of the above-described methods for controlling the blade angle of a mixed-flow pump.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. By analyzing real-time load data sets and historical load data sets, a confidence-based fused load is determined after weighting and merging predicted and real-time data. When the confidence-based fused load is not greater than the first response threshold, it indicates that the unit load is low. Therefore, the intake diagonal flow pump blades are controlled to supply water to the condenser at the basic intake angle, and the storage diagonal flow pump is controlled to store water in the storage tank at the basic storage angle. Thus, when the unit load is lower than the first response threshold, the intake diagonal flow pump blades are controlled to store water in the storage tank at the basic intake angle, thereby controlling the load increase when the unit load rises. When the load is high, water is supplied to the condenser through the water storage tank. When the confidence fusion load is greater than the first response threshold, it indicates that the unit load is increasing. Therefore, the confidence fusion load is analyzed to control the water supply from the water storage tank to the condenser, and to control the angle of the blades of the water storage diagonal flow pump and the water intake diagonal flow pump to supply water to the condenser. This allows water to be stored in the water storage tank in advance when the confidence fusion load is lower than the first response threshold, and water to be supplied to the condenser through the water storage tank when the confidence fusion load is higher than the first response load, thereby balancing the unit load and improving the load response capability of the diagonal flow pump. 2. By inputting historical load data into the load forecasting model, the forecast load data group is determined. Then, based on the real-time load data, the overlapping forecast data group that coincides with the real-time load data time and the non-overlapping data group after the real-time load data time point are identified and analyzed. The forecast confidence level of the forecast data is determined based on the average absolute deviation between the overlapping forecast data and the real-time load data. Then, the average real-time load and the average forecast load are fused based on the forecast confidence level to determine the confidence fused load. Thus, the forecast data and real-time data are fused based on the confidence level, thereby improving the forecast accuracy of unit load data. 3. By determining whether the confidence fusion load is greater than the second response threshold, if the confidence fusion load is not greater than the second response threshold, analyze the confidence fusion load to determine the first injection flow rate and the corrected storage angle. Control the water storage tank to replenish water to the condenser at the first injection flow rate, and control the water storage diagonal flow pump blades to store water in the water storage tank at the corrected storage angle. Control the water intake diagonal flow pump blades to supply water to the condenser at the preset basic water intake angle. If the confidence fusion load is greater than the second response threshold, analyze the confidence fusion load to determine the second injection flow rate and the corrected water intake angle, and control the water intake diagonal flow pump blades... Water is supplied to the condenser by adjusting the water intake angle, and the water storage tank is controlled to replenish water to the condenser at a second water injection flow rate until the water flow lag time ends. Thus, when the confidence fusion load is between the first response threshold and the second response threshold, the angle of the water intake diagonal flow pump blades is not increased. When the confidence fusion load is greater than the second response threshold, the water intake angle is adjusted to control the water intake diagonal flow pump blades. At the same time, the water storage tank is controlled to replenish water to the condenser during the water flow lag time of the water intake diagonal flow pump. This avoids frequent switching of the water intake diagonal flow pump blade angle, thereby quickly replenishing the cooling water flow gap and improving the stability and safety of unit operation. Attached Figure Description

[0017] Figure 1 This is a flowchart of a method for controlling the blade angle of a mixed-flow pump according to an embodiment of this application.

[0018] Figure 2 This is a flowchart in this application embodiment of analyzing real-time load data groups and historical load data groups to determine the confidence fusion load.

[0019] Figure 3 This is a flowchart illustrating how the confidence-based fusion load is analyzed in this embodiment of the application to control the water supply from a preset water storage tank to a preset condenser, and how the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades are controlled to supply water to the condenser.

[0020] Figure 4 This is a flowchart illustrating the analysis of the confidence fusion load in this embodiment of the application to determine the first injection flow rate and the corrected storage angle.

[0021] Figure 5 This is a flowchart illustrating the analysis of the first water injection flow rate in this embodiment of the application to determine the corrected water storage angle.

[0022] Figure 6 This is a flowchart illustrating the analysis of the confidence fusion load in this embodiment of the application to determine the second water injection flow rate and the corrected water intake angle.

[0023] Figure 7 This is a flowchart in this application embodiment of analyzing the main pump water intake flow rate to determine the second water injection flow rate. Detailed Implementation

[0024] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 7 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0025] This application discloses a method, system, terminal, and storage medium for controlling the blade angle of a mixed-flow pump. Specifically, it discloses a processing terminal, intake mixed-flow pump blades, storage mixed-flow pump blades, and a water storage tank. The processing terminal acquires real-time load data sets and historical load data sets, analyzes these data sets to determine a final confidence-based fused load after weighted fusion of predicted and real-time data. When the confidence-based fused load is not greater than a first response threshold, it indicates that the unit load is low. Therefore, the intake mixed-flow pump blades are controlled to supply water to the condenser at the basic intake angle, and the storage mixed-flow pump is controlled to store water in the water storage tank at the basic storage angle, thereby reducing the unit load. When the load is below the first response threshold, the blades of the intake diagonal flow pump are controlled to store water in the storage tank at the basic intake angle. Then, when the load increases, water is supplied to the condenser through the storage tank. When the confidence fusion load is greater than the first response threshold, it indicates that the unit load has increased. Therefore, the confidence fusion load is analyzed to control the water supply from the storage tank to the condenser, and to control the angles of the blades of the storage diagonal flow pump and the intake diagonal flow pump to supply water to the condenser. This allows for advance water storage in the storage tank when the confidence fusion load is below the first response threshold, and water supply to the condenser through the storage tank when the confidence fusion load is above the first response load, thereby balancing the unit load and improving the load response capability of the diagonal flow pump.

[0026] Reference Figure 1 This application discloses a method for controlling the blade angle of a mixed-flow pump, comprising the following steps: Step S100: Obtain the real-time load data set and historical load data set of the preset unit.

[0027] Among them, the unit refers to the core heat source component in a nuclear power plant that needs to be cooled by cooling water.

[0028] The real-time load data set refers to the real-time load rate data of the generating unit, which is determined by the processing terminal by setting a load rate monitoring sliding window and retrieving the load rate data of the generating unit in real time based on the sliding window.

[0029] Historical load data sets refer to the historical load rate data of the generating units. The data is determined by the processing terminal by retrieving the load rate data stored in the system, with the real-time load data set as the data endpoint.

[0030] Step S101: Analyze the real-time load data set and the historical load data set to determine the confidence-blended load.

[0031] Among them, the confidence-fused load refers to the unit load rate determined by fusing predicted load data and real-time load data based on the confidence level of the predicted data. This is determined by the processing terminal through analysis of real-time load data sets and historical load data sets. Specific analysis steps are detailed below. Figure 2 The steps in the process.

[0032] Step S102: Determine whether the confidence fusion load is greater than the preset first response threshold.

[0033] The first response threshold refers to the lower limit of the unit load rate for controlling the water storage tank to replenish water to the condenser. It is determined by the operator based on the unit's cooling needs, the water storage tank's pumping capacity, the water intake pump blades, and the water intake capacity of the water storage pump blades.

[0034] The processing terminal determines whether the confidence fusion load is greater than the first response threshold, thereby determining whether water needs to be added to the condenser, thus improving the load response capability of the water storage tank.

[0035] Step S1021: If it is not greater than, then control the preset water intake diagonal flow pump blades to supply water to the preset condenser at the preset basic water intake angle, and control the preset water storage diagonal flow pump blades to store water in the preset water storage tank at the preset basic water storage angle.

[0036] If the processing terminal determines that the confidence fusion load is not greater than the first response threshold, it indicates that there is no need to control the water storage tank to replenish water to the condenser at this time. Therefore, the water intake diagonal flow pump blades are controlled to supply water to the preset condenser at the basic water intake angle, and the water storage diagonal flow pump blades are controlled to store water in the water storage tank at the basic water storage angle, thereby improving the load balance of the unit and improving the load response capability of the diagonal flow pump.

[0037] The water intake impeller of the water intake mixed flow pump refers to the water intake impeller of the water intake mixed flow pump that is directly connected to the condenser for water supply. The angle of the impeller can be adjusted by the hydraulic transmission system to meet the cooling requirements of the unit. The adjustable impeller and hub in the hydraulic transmission system are made of super duplex stainless steel, which is resistant to seawater corrosion, to improve the reliability of the impeller adjustment system. The hub has a sealed structure to prevent the conveying medium from entering the hub. The adjustment mechanism components do not come into contact with seawater and are completely isolated from seawater, which improves the service life and reliability of the adjustment mechanism components.

[0038] A condenser is the main heat exchange equipment in the thermal cycle system of a nuclear power plant. The condenser is directly connected to the water supply pipeline of the water storage tank and the intake diagonal flow pump, and heat exchange in the nuclear power plant is achieved through the supply of cooling water.

[0039] The impeller of a water storage mixed-flow pump refers to the water intake impeller of a water storage mixed-flow pump that is directly connected to a water storage tank for water supply and has a lower power than a water intake mixed-flow pump. The angle of the impeller can be adjusted by a hydraulic transmission system.

[0040] A water storage tank is a water storage device that is directly connected to the water supply pipeline of the water storage diagonal flow pump and the water intake pipeline of the condenser. A water pump is installed between the water storage tank and the water intake pipeline of the condenser to transfer the cooling water in the water storage tank to the condenser.

[0041] The basic intake angle refers to the angle between the blades of the intake mixed flow pump and the rotational plane of the intake mixed flow pump shaft when the confidence fusion load is lower than the first response threshold. It is determined by the operator through simulation tests at the first response threshold to determine the heat generated by the unit at the first response threshold, and then comprehensively based on the heat exchange requirements of the unit and the fitting relationship between the intake capacity of the intake mixed flow pump and the blade angle of the intake mixed flow pump.

[0042] The basic water storage angle refers to the angle between the blades of the water storage mixed flow pump and the rotating surface of the water storage mixed flow pump shaft when the confidence fusion load is lower than the first response threshold. It is determined by the operator based on the fluctuation of the nuclear power plant unit load, the size of the water storage pool, and the pumping capacity of the water storage mixed flow pump.

[0043] Step S1022: If it is greater than, the confidence fusion load is analyzed to control the preset water storage tank to replenish water to the preset condenser, and to control the angle of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser.

[0044] If the processing terminal determines that the confidence fusion load is greater than the first response threshold, it indicates that it is necessary to control the water storage tank to replenish water to the condenser. Simultaneously, the angles of the intake and intake pump blades should be controlled to match the unit load. Therefore, the confidence fusion load is analyzed to control the water storage tank to replenish water to the condenser, and the angles of the intake and intake pump blades are controlled to supply water to the condenser. Specific analysis steps are detailed below. Figure 3 The steps in the process.

[0045] The water storage tank is the same as the water storage tank in step S1021. The condenser is the same as the condenser in step S1021. The blades of the water storage diagonal flow pump are the same as the water storage diagonal flow pump in step S1021. The blades of the water intake diagonal flow pump are the same as the water intake diagonal flow pump in step S1021.

[0046] Reference Figure 2 The steps for analyzing real-time load data sets and historical load data sets to determine the confidence-based fused load include: Step S200: Input the historical load data set into the preset load forecasting model to determine the forecast load data set.

[0047] The load forecasting model refers to a model that learns from historical load data sets based on neural network algorithms and finally outputs a short-cycle forecast load data set. This model first extracts the historical load data set to determine the effective historical load data, and then uses neural network algorithms to extract features and perform time-series correlation analysis on the effective load data set to finally generate a short-cycle forecast load data set.

[0048] The predicted load data set refers to a short-cycle predicted data set that starts at the same time as the real-time load data set. It is determined by the processing terminal by inputting historical load data into the load prediction model, providing data support for the subsequent determination of the confidence fusion load.

[0049] Step S201: Extract data from the predicted load data group based on the real-time load data group to determine the overlapping and non-overlapping predicted data groups.

[0050] Among them, the overlapping forecast data group refers to the forecast load data group that coincides with the time point of the real-time load data group. The processing terminal first analyzes the real-time load data group to determine the number of data in the real-time load data group, and then extracts and determines the forecast load data from the data starting point based on the number of data.

[0051] Non-overlapping data groups refer to predicted load data groups whose time points do not overlap with the real-time load data groups. After the processing terminal determines the overlapping predicted data groups, it integrates the remaining data in the predicted load data groups to form non-overlapping data groups.

[0052] Step S202: Calculate the absolute deviation between the overlapping prediction data set and the real-time load data set to determine the absolute deviation sequence.

[0053] The absolute deviation sequence refers to the absolute load deviation between the predicted data and the real-time data, which is determined by the processing terminal by calculating the absolute deviation between the overlapping predicted data set and the real-time load data set.

[0054] Step S203: Calculate the average value of the absolute deviation sequence to determine the mean absolute deviation.

[0055] The mean absolute deviation refers to the average absolute deviation between the predicted data and the real-time data, which is determined by the processing terminal by calculating the arithmetic mean of the absolute deviation sequence.

[0056] Step S204: Input the mean absolute deviation and the preset maximum unit load into the preset confidence assessment model to determine the prediction confidence.

[0057] The maximum unit load refers to the maximum operating load of the unit, which is determined by the operator based on the maximum cooling capacity of the condenser and the rated load of the unit.

[0058] The confidence assessment model refers to a formulaic model that first normalizes the mean absolute deviation between the predicted data and the real-time data using the unit's maximum operating load, and then determines the confidence level of the predicted data based on the normalized mean absolute deviation. The specific model formula is as follows: .

[0059] In the formula, To predict confidence levels, The mean absolute deviation, This represents the maximum unit load.

[0060] Step S205: Calculate the average values ​​of the real-time load data group and the non-overlapping data group respectively to determine the average real-time load and the average predicted load.

[0061] The average real-time load refers to the average value of the real-time load data set, which is determined by the processing terminal by calculating the arithmetic mean of the real-time load data.

[0062] The average predicted load refers to the average value of non-overlapping data sets, which is determined by the processing terminal by calculating the arithmetic mean of the non-overlapping data sets.

[0063] Step S206: Input the prediction confidence level, average real-time load and average predicted load into the preset weighted fusion model to determine the confidence fusion load.

[0064] The weighted fusion model refers to a formula model that uses the prediction confidence level as the weight to fuse the average real-time load and the average predicted load, and finally determines the confidence-fused load. The specific model formula is as follows: .

[0065] In the formula, To ensure the fusion load, To predict confidence levels, For average forecast load, This represents the average real-time load.

[0066] The confidence-fused load is consistent with the confidence-fused load in step S101. It is determined by the processing terminal by inputting the prediction confidence level, average real-time load and average predicted load into the weighted fusion model. Thus, the unit load is determined by fusing the average real-time load and average predicted load based on the confidence level of the prediction data, thereby improving the control accuracy of the mixed-flow pump blade angle.

[0067] Reference Figure 3The steps of analyzing the confidence-based fusion load to control the supply of water from the preset water storage tank to the preset condenser, and controlling the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser include: Step S300: Determine whether the confidence fusion load is greater than the preset second response threshold.

[0068] The second response threshold refers to the lower load threshold at which the water intake pump blades are increased to increase the water intake angle without starting the water storage pump, and the water storage tank is made up to replenish water to the condenser within the lag time of the water intake flow from the water intake pump. This threshold is set by the operator based on the water intake capacity of the water intake pump and the water storage pump, as well as the heat exchange requirements of the unit.

[0069] The system determines whether the confidence fusion load is greater than the second response threshold by processing the terminal, thereby determining whether it is necessary to increase the water intake angle of the intake mixed flow pump blades and controlling the water storage tank to replenish water to the condenser during the water flow lag time. Based on the unit load, the system dynamically controls the angle of the mixed flow pump blades to improve the load response capability of the mixed flow pump.

[0070] Step S301: If it is not greater than, then analyze the confidence fusion load to determine the first injection flow rate and the corrected storage angle.

[0071] If the processing terminal determines that the confidence fusion load is not greater than the second response threshold, it indicates that there is no need to increase the intake angle of the intake diagonal flow pump. Therefore, the confidence fusion load is analyzed to determine the first injection flow rate and the corrected storage angle.

[0072] The first injection flow rate refers to the flow rate of water injected from the storage tank into the condenser when the confidence fusion load is between the first and second response thresholds. The corrected storage angle refers to the water intake angle of the storage tank's mixed-flow pump blades when the injection flow rate is the first injection flow rate. Both are determined by the treatment terminal through analysis of the confidence fusion load; the specific analysis steps are described in [reference needed]. Figure 4 The steps in the process.

[0073] Step S302: Control the water storage tank to replenish water to the condenser at the first water injection flow rate, control the water storage diagonal flow pump blades to store water in the water storage tank at the corrected water storage angle, and control the water intake diagonal flow pump blades to supply water to the condenser at the preset basic water intake angle.

[0074] The basic water intake angle is consistent with the basic water intake angle in step S1021.

[0075] After determining the first water injection flow rate and the corrected water storage angle, the water storage tank is controlled to replenish water to the condenser at the first water injection flow rate, and the water storage diagonal flow pump blades are controlled to store water in the water storage tank at the corrected water storage angle. The water intake diagonal flow pump blades are controlled to supply water to the condenser at the basic water intake angle, thereby avoiding frequent switching of the water intake diagonal flow pump angle.

[0076] Step S303: If it is greater than, then analyze the confidence fusion load to determine the second injection flow rate and the corrected intake angle.

[0077] If the processing terminal determines that the confidence fusion load is greater than the second response threshold, it indicates that the blade angle of the intake diagonal flow pump needs to be adjusted. At the same time, the water storage tank is controlled to replenish water to the condenser during the lag time of the water flow from the intake diagonal flow pump. Therefore, the confidence fusion load is analyzed to determine the second water injection flow rate and correct the water intake angle.

[0078] The second injection flow rate refers to the injection flow rate of the water storage tank when replenishing the condenser during the water flow lag time. The corrected intake angle refers to the blade angle of the intake mixed-flow pump when the confidence fusion load exceeds the second response threshold. All the above data are determined by the processing terminal through analysis of the confidence fusion load; the specific analysis steps are detailed in [reference needed]. Figure 6 The steps in the process.

[0079] Step S304: Control the blades of the water intake diagonal flow pump to correct the water intake angle to supply water to the condenser, and control the water storage tank to replenish water to the condenser at the second water injection flow rate until the preset water flow lag time ends.

[0080] Among them, the water flow lag time refers to the lag time of the cooling water taken by the blades of the water intake mixed flow pump finally reaching the condenser after being transported through the pipeline. It is determined by the operator through water intake pre-experimentation on the water intake mixed flow pump.

[0081] After determining the second water injection flow rate and correcting the water intake angle, the water storage diagonal flow pump is not started. Instead, the water intake diagonal flow pump blades are controlled to supply water to the condenser at the corrected water intake angle. The water storage tank is then controlled to replenish water to the condenser at the second water injection flow rate until the water flow lag time ends. This allows the cooling water in the water storage tank to compensate for the condenser's water demand during the water flow lag time, thereby balancing the unit load and improving the stability of the unit's operation.

[0082] Reference Figure 4 The steps for analyzing the confidence-based fusion load to determine the first injection flow rate and the corrected storage angle include: Step S400: Calculate the difference between the confidence fusion load and the preset first load lower limit to determine the current load span.

[0083] The first load lower limit is consistent with the first response threshold in step S102.

[0084] The current load span refers to the load span within the load gradient specified by the first load lower limit, which is determined by the processing terminal by calculating the difference between the confidence fusion load and the first load lower limit.

[0085] Step S401: Obtain the first load span.

[0086] The first load span refers to the span of the load gradient calibrated by the first load lower limit, which is determined by the processing terminal by first retrieving the second response threshold and the first response threshold, and then calculating the difference between the second response threshold and the first response threshold.

[0087] Step S402: Calculate the ratio of the current load span to the first load span to determine the proportion of the first load.

[0088] The first load percentage refers to the percentage of the load gradient specified by the first load lower limit of the confidence fusion load, which is determined by the processing terminal by calculating the ratio of the current load span to the first load span.

[0089] Step S403: Input the first load ratio, the preset first flow upper limit, and the preset first flow lower limit into the preset water replenishment model to determine the first water injection flow rate.

[0090] The first flow limit refers to the maximum water flow rate of the water storage tank to replenish the condenser within the load gradient specified by the first load lower limit. The first flow limit is determined by the operator through a simulation experiment with the unit load set as the second response threshold and the water intake angle as the basic water intake angle. Based on the heat exchange demand of the unit under the simulation experiment, the amount of water replenishment that the water storage tank needs to provide is the first flow limit.

[0091] The first flow lower limit refers to the minimum water flow rate of the water storage tank to replenish the condenser within the load gradient specified by the first load lower limit. It is determined by the operator through a simulation experiment with the unit load set as the first response threshold and the water intake angle as the basic water intake angle. Based on the heat exchange demand of the unit under the simulation experiment, the amount of water to be replenished by the water storage tank is determined, which is the first flow lower limit.

[0092] The water replenishment model refers to a formulaic model that determines the first water injection flow rate based on the first load ratio. The specific model formula is as follows: .

[0093] In the formula, The first water injection flow rate, The first lower limit of flow rate, The first traffic limit, This represents the first load percentage.

[0094] The first water injection flow rate is the same as the first water injection flow rate in step S301, and is determined by the processing terminal by inputting the first load ratio, the first flow rate upper limit, and the first flow rate lower limit into the water replenishment model.

[0095] Step S404: Analyze the first water injection flow rate to determine the corrected water storage angle.

[0096] The corrected water storage flow rate is consistent with the corrected water storage flow rate in step S301, and is determined by the processing terminal through analysis of the first injection flow rate. The specific analysis steps are as follows: Figure 5 The steps in the process.

[0097] Reference Figure 5 The steps for analyzing the first injection flow rate to determine the corrected water storage angle include: Step S500: Obtain the current water volume in the water storage tank.

[0098] The current water volume in the storage tank refers to the volume of cooling water stored in the tank. This volume is determined by the processing terminal by first acquiring the measurement data from the liquid level sensors installed in the storage tank, and then calculating the volume of cooling water in the storage tank based on the design parameters of the storage tank.

[0099] Step S501: Calculate the difference between the preset rated water volume of the water storage tank and the current water volume of the water storage tank to determine the remaining storage capacity of the water storage tank.

[0100] The rated water volume of the water storage tank refers to the maximum cooling water storage capacity of the water storage tank, which is determined by the operator based on the design parameters of the water storage tank.

[0101] The remaining storage capacity of a water storage tank refers to the remaining amount of water that can be stored in the tank, which is determined by the treatment terminal by calculating the difference between the rated water capacity of the tank and the current water capacity.

[0102] Step S502: Calculate the quotient of the remaining storage capacity of the water tank and the rated water capacity of the water tank to determine the remaining capacity factor of the water tank.

[0103] Among them, the water storage tank surplus factor refers to the proportion of the remaining storage capacity of the water storage tank, which is determined by the treatment terminal by calculating the quotient of the remaining storage capacity of the water storage tank and the rated water volume of the water storage tank.

[0104] Step S503: Determine the water storage correction factor by searching the preset water level correction table according to the water storage tank surplus factor.

[0105] The water level correction table refers to a gradient mapping table of water level correction factors divided by the water storage tank surplus factor. For example, when the water storage surplus ratio is between 10% and 30%, the corresponding water storage correction factor is 1.5, etc. It is determined by the operator based on the water intake capacity of the water storage pump, the water storage capacity of the water storage tank, and the heat exchange requirements of the condenser.

[0106] The water storage correction factor refers to the water intake flow correction coefficient determined based on the water storage tank surplus factor. It is determined by the treatment terminal by looking up the corresponding water storage correction factor in the water level correction table according to the gradient of the water storage tank surplus factor.

[0107] Step S504: Calculate the product of the first water injection flow rate, the water storage tank surplus factor, and the water storage correction factor to determine the first water storage flow rate.

[0108] The first water storage flow rate refers to the water intake flow rate of the water storage diagonal flow pump, which is determined by the treatment terminal by calculating the product of the first water injection flow rate, the water storage tank surplus factor, and the water storage correction factor.

[0109] Step S505: Input the first water storage flow rate into the preset quadratic fitting model to determine the corrected water storage angle.

[0110] The quadratic fitting model refers to a model that uses the angle of the blades of the water storage mixed flow pump as the independent variable and the water intake flow rate of the water storage mixed flow pump as the dependent variable. The operator conducts a preliminary experiment by setting different blade angles of the water storage mixed flow pump to determine the different water intake flow rates corresponding to different pump angles. Then, the model is determined by a quadratic fitting based on the relationship between the angle and the water intake flow rate.

[0111] The correction of the water storage angle is consistent with the correction of the water storage angle in step S301. The blade angle is determined by the processing terminal by inputting the first water storage flow rate into the secondary fitting model.

[0112] Reference Figure 6 The steps for analyzing the confidence-based fusion load to determine the second injection flow rate and the corrected intake angle include: Step S600: Calculate the quotient of the confidence fusion load and the preset maximum unit load to determine the flow adjustment ratio.

[0113] The maximum unit load is the same as the maximum unit load in step S204.

[0114] The flow rate adjustment ratio refers to the proportion by which the maximum water intake flow rate is adjusted. It is determined by the treatment terminal by calculating the quotient of the confidence fusion load and the maximum unit load.

[0115] Step S601: Calculate the product of the preset maximum water intake flow rate and the flow rate adjustment ratio to determine the main pump water intake flow rate.

[0116] The maximum water intake flow rate refers to the maximum water intake flow rate of the water intake mixed flow pump blades, which is determined by the operator through performance testing of the water intake mixed flow pump.

[0117] The main pump intake flow rate refers to the target intake flow rate of the intake mixed flow pump blades under the current confidence fusion load, which is determined by the treatment terminal by calculating the product of the maximum intake flow rate and the flow adjustment ratio.

[0118] Step S602: Input the main pump water intake flow rate into the preset cubic fitting model to determine the correct water intake angle.

[0119] The cubic fitting model refers to a cubic fitting model with the angle of the intake mixed flow pump blades as the independent variable and the intake water flow rate of the intake mixed flow pump as the dependent variable. The operator conducts a preliminary experiment by setting different intake mixed flow pump blade angles to determine the different intake flow rates corresponding to different intake mixed flow pump angles. Then, a cubic fitting is performed based on the relationship between the angle and the intake flow rate to determine the model.

[0120] The corrected water intake angle is consistent with the corrected water intake angle in step S303. The blade angle is determined by the processing terminal by inputting the main pump water intake flow rate into the cubic fitting model.

[0121] Step S603: Analyze the main pump intake flow rate to determine the second injection flow rate.

[0122] The second water injection flow rate is the same as the second water injection flow rate in step S303, and is determined by the treatment terminal through analysis of the main pump's water intake flow rate. The specific analysis steps are as follows: Figure 7 The steps in the process.

[0123] Reference Figure 7 The steps for analyzing the main pump intake flow rate to determine the second injection flow rate include: Step S700: Obtain the current pump flow rate and the real-time water volume in the storage tank.

[0124] The current pump water flow rate refers to the cooling water flow rate received by the condenser end from the intake mixed flow pump, which is determined by the processing terminal by directly retrieving the measurement data of the electromagnetic flowmeter installed at the condenser inlet corresponding to the intake mixed flow pump.

[0125] The real-time water volume of the water storage tank is consistent with the current water volume of the water storage tank in step S500. The processing terminal first obtains the measurement data of the liquid level sensor deployed in the water storage tank, and then calculates the cooling water volume in the water storage tank according to the design parameters of the water storage tank to determine the volume.

[0126] Step S701: Calculate the difference between the main pump intake flow rate and the current pump flow rate to determine the pump flow rate deviation.

[0127] Among them, the pump water flow deviation refers to the deviation between the current condenser inlet water flow and the target water flow, which is determined by the treatment terminal by calculating the difference between the main pump intake flow and the current pump water flow.

[0128] Step S702: Calculate the product of the pump flow deviation and the preset water intake lag time to determine the water demand of the storage tank.

[0129] The water intake delay time is consistent with the water flow delay time in step S304, which is determined by the operator through a water intake pre-experiment on the water intake diagonal flow pump.

[0130] The required water volume for the water storage tank refers to the amount of cooling water needed to replenish the condenser with water from the pump flow rate deviation during the water intake lag time. It is determined by the treatment terminal by calculating the product of the pump flow rate deviation and the water intake lag time.

[0131] Step S703: Determine whether the water demand of the water storage tank is greater than the real-time water volume of the water storage tank.

[0132] The system determines whether the water demand of the storage tank exceeds the real-time water volume of the storage tank through the processing terminal, and then replenishes the condenser with water based on the remaining water volume in the storage tank to improve the utilization efficiency of cooling water.

[0133] Step S7031: If it is greater than, calculate the quotient of the real-time water volume of the storage tank and the water intake lag time to determine the second water injection flow rate.

[0134] If the processing terminal determines that the water demand of the water storage tank is greater than the real-time water volume of the water storage tank, then the quotient of the real-time water volume of the water storage tank and the water intake delay time is calculated to determine the second water injection flow rate.

[0135] The second water injection flow rate is the same as the second water injection flow rate in step S603. It is determined by the processing terminal by calculating the quotient of the real-time water volume of the water storage tank and the water intake lag time when the water demand of the water storage tank is greater than the real-time water volume of the water storage tank.

[0136] Step S7032: If it is not greater than, then the pump water flow deviation is determined as the second injection water flow.

[0137] If the processing terminal determines that the water demand of the storage tank is not greater than the real-time water volume of the storage tank, it indicates that the cooling water volume of the storage tank is sufficient at this time. Therefore, the pump flow deviation is determined as the second injection flow rate.

[0138] The second water injection flow rate is the same as the second water injection flow rate in step S603. It is determined by the processing terminal based on the pump flow rate deviation when the water demand in the water storage tank is not greater than the real-time water volume in the water storage tank.

[0139] Based on the same inventive concept, embodiments of this application provide a mixed-flow pump blade angle control system, including: The acquisition module is used to acquire real-time load data sets, historical load data sets, the first load span, the current water volume in the storage tank, the current pump flow rate, and the real-time water volume in the storage tank. A memory for storing a program for a method of controlling the blade angle of a mixed-flow pump; The processor can load and execute programs in memory to implement a method for controlling the blade angle of a mixed-flow pump.

[0140] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0141] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a method for controlling the blade angle of a mixed-flow pump.

[0142] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0143] Based on the same inventive concept, this application provides a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded and executed by the processor to control the blade angle of a mixed flow pump.

[0144] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0145] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for controlling the blade angle of a mixed-flow pump, characterized in that, include: Acquire the real-time load data set and historical load data set of the preset generating units; Analyze real-time load data sets and historical load data sets to determine the confidence-based fused load; Determine whether the confidence fusion load is greater than the preset first response threshold; If it is not greater than, then control the preset water intake diagonal flow pump blades to supply water to the preset condenser at the preset basic water intake angle, and control the preset water storage diagonal flow pump blades to store water in the preset water storage tank at the preset basic water storage angle. If the load is greater than the specified value, the confidence fusion load is analyzed to control the water supply from the preset water storage tank to the preset condenser, and to control the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser.

2. The method for controlling the blade angle of a mixed-flow pump according to claim 1, characterized in that, The steps for analyzing real-time load data sets and historical load data sets to determine confidence-based fused loads include: Input the historical load data set into the preset load forecasting model to determine the forecast load data set; Data is extracted from the real-time load data set to determine the overlapping and non-overlapping forecast data sets. Calculate the absolute deviation between the overlapping forecast data set and the real-time load data set to determine the absolute deviation sequence; Calculate the average of the absolute deviation sequence to determine the mean absolute deviation; The mean absolute deviation and the preset maximum unit load are input into the preset confidence assessment model to determine the prediction confidence. Calculate the average values ​​of the real-time load data set and the non-overlapping data set to determine the average real-time load and the average predicted load. The predicted confidence level, average real-time load, and average predicted load are input into a preset weighted fusion model to determine the confidence fusion load.

3. The method for controlling the blade angle of a mixed-flow pump according to claim 1, characterized in that, The steps of analyzing the confidence-based fusion load to control the supply of water from the preset water storage tank to the preset condenser, and controlling the angles of the preset water storage diagonal flow pump blades and the preset water intake diagonal flow pump blades to supply water to the condenser include: Determine whether the confidence fusion load is greater than the preset second response threshold; If it is not greater than, the confidence fusion load is analyzed to determine the first injection flow rate and the corrected storage angle; The water storage tank is controlled to replenish water to the condenser at the first water injection flow rate, and the water storage diagonal flow pump blades are controlled to store water in the water storage tank by correcting the water storage angle, and the water intake diagonal flow pump blades are controlled to supply water to the condenser at the preset basic water intake angle. If it is greater than that, the confidence fusion load is analyzed to determine the second injection flow rate and the corrected intake angle; Control the blades of the water intake diagonal flow pump to correct the water intake angle to supply water to the condenser, and control the water storage tank to replenish water to the condenser at a second water injection flow rate until the preset water flow lag time ends.

4. The method for controlling the blade angle of a mixed-flow pump according to claim 3, characterized in that, The steps for analyzing the confidence-integrated load to determine the first injection flow rate and the corrected storage angle include: Calculate the difference between the confidence fusion load and the preset first load lower limit to determine the current load span; Obtain the first load span; Calculate the ratio of the current load span to the first load span to determine the proportion of the first load. The first load percentage, the preset first flow upper limit, and the preset first flow lower limit are input into the preset water replenishment model to determine the first water injection flow rate; The initial water injection flow rate was analyzed to determine the corrected water storage angle.

5. The method for controlling the blade angle of a mixed-flow pump according to claim 4, characterized in that, The steps for analyzing the first injection flow rate to determine the corrected water storage angle include: Get the current water volume in the water storage tank; Calculate the difference between the preset rated water volume of the water storage tank and the current water volume of the water storage tank to determine the remaining storage capacity of the water storage tank; Calculate the quotient of the remaining storage capacity of the water storage tank and the rated water capacity of the water storage tank to determine the water storage tank surplus factor; The water storage correction factor is determined by looking up the water level correction factor in the preset water level correction table based on the water storage tank surplus factor. Calculate the product of the first injection flow rate, the reservoir capacity factor, and the storage correction factor to determine the first storage flow rate; The first water flow rate is input into a preset quadratic fitting model to determine the corrected water storage angle.

6. The method for controlling the blade angle of a mixed-flow pump according to claim 3, characterized in that, The steps for analyzing the confidence-based fusion load to determine the second injection flow rate and the corrected intake angle include: Calculate the quotient between the confidence-integrated load and the preset maximum unit load to determine the flow adjustment ratio; Calculate the product of the preset maximum water intake flow rate and the flow rate adjustment ratio to determine the main pump water intake flow rate; Input the main pump's water intake flow rate into the preset cubic fitting model to determine the corrected water intake angle; The main pump intake flow rate is analyzed to determine the second injection flow rate.

7. The method for controlling the blade angle of a mixed-flow pump according to claim 6, characterized in that, The steps for analyzing the main pump intake flow rate to determine the second injection flow rate include: Get the current pump flow rate and the real-time water volume in the storage tank; Calculate the difference between the main pump intake flow rate and the current pump flow rate to determine the pump flow rate deviation; Calculate the product of the pump flow rate deviation and the preset water intake lag time to determine the water demand of the storage tank; Determine whether the water demand of the water storage tank is greater than the real-time water volume of the water storage tank. If it is greater than that, calculate the quotient of the real-time water volume of the storage tank and the water intake lag time to determine the second water injection flow rate; If it is not greater than, then the pump water flow deviation is determined as the second injection water flow.

8. A blade angle control system for a mixed-flow pump, characterized in that, include: The acquisition module is used to acquire real-time load data sets and historical load data sets; A memory for storing a program for a method for controlling the blade angle of a mixed-flow pump as described in any one of claims 1 to 7; The processor and the program in the memory can be loaded and executed by the processor to implement the method for controlling the blade angle of a mixed flow pump as described in any one of claims 1 to 7.

9. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 7 for controlling the blade angle of a mixed-flow pump.

10. A computer-readable storage medium, characterized in that, The system contains a computer program that can be loaded by a processor and executed as described in any one of claims 1 to 7, for controlling the blade angle of a mixed-flow pump.

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