Water supply process pump valve self-adaptive coordination control method based on data fusion

Abstract

The invention relates to the technical field of nuclear power station water supply control, and discloses a water supply process pump valve self-adaptive coordination control method based on data fusion, computer equipment, a computer readable storage medium and a computer program product in order to solve the problem that the energy consumption of a pump is too high due to an existing water supply control mode. The method comprises the steps that the current liquid level of the steam generator and the change condition of the current liquid level are obtained; calculating the actual position of the current liquid level in the liquid level range based on the current liquid level; according to the actual position and the change condition of the current liquid level, the target water supply flow is determined; under the condition of a steady-state working condition at present, valve opening degree adjustment is executed until the valve opening degree reaches an opening degree upper limit value and the target water supply flow at the moment still has a rising trend, and pump rotating speed adjustment is switched to; and under the condition of the dynamic working condition at present, pump rotating speed adjustment is executed. By adopting the method, the purpose of reducing the energy consumption of the pump can be achieved, and the energy-saving operation of the whole water supply system is realized.

Description

Technical Field

[0001] The present application relates to the technical field of feed water control in nuclear power plants, and more specifically, to a method for adaptively coordinating the control of pumps and valves in the feed water process based on data fusion, a computer device, a computer-readable storage medium, and a computer program product. Background Art

[0002] With the increasing requirements for intelligent control, the requirements for the control of the feed water system have become more complex. Therefore, it is necessary to perform refined control on the feed water process, and performing refined control on the feed water process is of great significance for the intelligent operation of the nuclear power plant system and the high-efficiency energy saving of the power generation system.

[0003] The basic goal of performing refined control on the feed water process is to achieve the control of the steam generator liquid level by controlling the pump speed and valve opening. During the operation of the feed water system, the liquid level of the steam generator will fluctuate up and down with the change of the external power load. The feed water system adjusts the pump speed and valve opening to ensure that the liquid level of the steam generator is maintained within a reasonable range.

[0004] Currently, the feed water control for maintaining the liquid level of the nuclear power plant steam generator mainly adopts a three-impulse method, which respectively passes the steam flow, feed water flow, and steam generator water level through a PID controller (Proportion Integration Differentiation), calculates the opening of the feed water regulating valve, and performs feed water regulation, and ensures that the pressure difference before and after the feed water regulating valve is maintained at a fixed value through the water pump.

[0005] However, this method restricts the working ability of the pump. Specifically, when the flow rate demand is small, the head of the pump is high, and the throttling effect of the regulating valve is obvious, and the work done by the pump is consumed by the throttling effect; when the flow rate demand is large, the head at the pump outlet will decrease. If the requirement of forcibly maintaining the pressure difference before and after the valve at a fixed value is met, the pump needs to do more work to provide the head and feed water flow. This method consumes more energy by the pump to ensure the reliability of water supply, is not conducive to refined management, and causes the problem of excessive energy consumption. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a method for adaptively coordinating the control of pumps and valves in the feed water process based on data fusion, a computer device, a computer-readable storage medium, and a computer program product, which fully considers the different control requirements of steady-state conditions and dynamic conditions, can reduce the energy consumption of the pump, and realize the energy-saving operation of the entire feed water system.

[0007] To achieve the above object, according to the first aspect of the present invention, there is provided a method for adaptively coordinating the control of pumps and valves in the feed water process based on data fusion, the method comprising:

[0008] Obtain the current liquid level of the steam generator and the change of the current liquid level;

[0009] Calculate the actual position of the current liquid level in the liquid level range based on the current liquid level;

[0010] Determine the target feed water flow according to the actual position and change of the current liquid level;

[0011] When currently in a steady-state condition, perform valve opening adjustment until the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, or the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switch to pump speed adjustment. The valve opening adjustment includes keeping the pump speed unchanged and adjusting the valve opening according to the target feed water flow. The pump speed adjustment includes keeping the valve opening unchanged and adjusting the pump speed according to the target feed water flow to ensure that the pressure difference before and after the valve is maintained at a fixed value;

[0012] When currently in a dynamic condition, perform pump speed adjustment until the pump speed reaches the speed corresponding to the steady-state condition, then switch to valve opening adjustment.

[0013] Further, when currently in a steady-state condition, perform valve opening adjustment until the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, or the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switch to pump speed adjustment. This includes when currently in a steady-state condition, keeping the pump speed at the first speed and adjusting the valve opening according to the target feed water flow; during the valve opening adjustment, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switch to pump speed adjustment; otherwise, continue to perform valve opening adjustment according to the target feed water flow at this time.

[0014] Further, during the valve opening adjustment, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switch to pump speed adjustment. This includes during the valve opening adjustment, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switch to pump speed adjustment; during the pump speed adjustment, if the pump speed reaches the second speed, then switch to valve opening adjustment. The second speed is the pump speed corresponding to the steady-state condition of the feed water process of the steam generator; during the valve opening adjustment, if the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switch to pump speed adjustment; otherwise, continue to perform valve opening adjustment according to the target feed water flow at this time.

[0015] Further, the above-mentioned pump-valve adaptive coordination control method for the feed water process based on data fusion further includes judging whether the current is in a dynamic condition or a steady-state condition according to the change of the current liquid level.

[0016] Further, according to the actual position and change situation of the current liquid level, determine the target feed water flow rate, including when the actual position of the current liquid level is less than the first value, set the target feed water flow rate to the maximum value of the feed water demand flow rate, increase the feed water of the steam generator until the actual position of the liquid level reaches the intermediate value, and then recalculate the target feed water flow rate according to the actual position and change situation of the liquid level at this time; when the actual position of the current liquid level is greater than the second value, set the target feed water flow rate to 0, reduce the feed water of the steam generator until the actual position of the liquid level reaches the intermediate value, and then recalculate the target feed water flow rate according to the actual position and change situation of the liquid level at this time; when the actual position of the current liquid level is not less than the first value and not greater than the second value, calculate the target feed water flow rate according to the actual position and change situation of the current liquid level.

[0017] Further, according to the actual position and change situation of the current liquid level, determine the target feed water flow rate, including calculating the target feed water flow rate according to the following formula: Qp target = A d *δL + 0.5*EL*(L max - L min ) 2 , where A d is the fusion coefficient, δL is the change situation of the current liquid level, EL is the actual position of the current liquid level, L max is the maximum value of the liquid level of the steam generator, and L min is the minimum value of the liquid level of the steam generator.

[0018] Further, the determination method of the fusion coefficient includes obtaining historical feed water data, where the historical feed water data includes historical feed water flow rate measurement values and historical operation data, and the historical operation data includes pump speed, valve opening, the liquid level of the steam generator and its change situation, and steam quality; establishing an initial feed water flow rate control model, where the initial feed water flow rate control model is a machine learning model; inputting the historical operation data into the initial feed water flow rate control model to obtain the sample feed water flow rate; training the initial feed water flow rate control model in the direction of minimizing the difference between the sample feed water flow rate and the historical feed water flow rate measurement value until the training stop condition is reached and then stopping to obtain the trained feed water flow rate control model; calculating the actual position corresponding to each liquid level in the liquid level range according to the liquid levels of multiple steam generators in the historical operation data, inputting the change situation corresponding to the liquid level and the calculated actual position of the liquid level into the trained feed water flow rate control model to obtain the predicted feed water flow rate; substituting multiple predicted feed water flow rates and the corresponding actual positions and change situations of the liquid levels into the calculation formula of the feed water flow rate to obtain multiple candidate fusion coefficients, and the calculation formula of the feed water flow rate is Qp = A*δL + 0.5*EL*(L max - L min ) 2, where A is the candidate fusion coefficient, δL is the change of the current liquid level, EL is the actual position of the current liquid level, L max is the maximum liquid level of the steam generator, and L min is the minimum liquid level of the steam generator; the average value of multiple candidate fusion coefficients is used as the fusion coefficient.

[0019] According to the second aspect of the present invention, there is also provided a computer device, which includes a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to implement the steps of any one of the above methods.

[0020] According to the third aspect of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above methods are implemented.

[0021] According to the fourth aspect of the present invention, there is also provided a computer program product, including a computer program. When the computer program is executed by a processor, the steps of any one of the above methods are implemented.

[0022] Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

[0023] (1) A method for adaptive coordinated control of pump valves in the feed water process based on data fusion provided by the present invention determines the target feed water flow by obtaining the current liquid level of the steam generator and the change of the current liquid level, and determines whether to perform pump speed regulation or valve opening regulation according to the actual position and change of the current liquid level. Specifically, it is divided into valve opening regulation under steady-state conditions and pump speed regulation under dynamic conditions, so as to achieve precise regulation of the feed water flow of the steam generator. Specifically, when the current is in a steady-state condition, the pump speed is kept unchanged and the valve opening is adjusted to achieve small-flow dynamic regulation of the steam generator; when the current is in a dynamic condition, the valve opening is kept unchanged and the pump speed is adjusted to achieve medium-flow dynamic regulation of the steam generator. Since this method takes into account the characteristics of the dynamic change of the target feed water flow in the actual feed water process, it can improve the working efficiency of the pump valve regulation in the feed water system; moreover, keeping the pump speed unchanged and adjusting the valve opening under steady-state conditions can achieve the required small-flow dynamic regulation of the steam generator, so it can achieve the purpose of reducing the energy consumption of the pump and realizing the energy-saving operation of the entire feed water system.

[0024] (2) A method for adaptive coordinated control of pump valves in the water supply process based on data fusion provided by the present invention provides a method for determining a fusion coefficient in the step of calculating the target water supply flow. By obtaining historical water supply data, including historical water supply flow measurement values and historical operation data, where the historical operation data includes pump speed, valve opening, liquid level and its change of the steam generator, steam quality, etc., the initial water supply flow control model is trained based on the historical water supply data to obtain a trained water supply flow control model, and then the fusion coefficient is calculated, thereby realizing the calculation of the target water supply flow based on multi-source data fusion, being able to comprehensively apply data such as pump speed, valve opening, liquid level and its change of the steam generator, steam quality, etc., improving the role that data can play in water supply flow control, and also being able to improve the accuracy of target water supply flow calculation, thereby improving the working efficiency of pump valve regulation in the water supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic flowchart of a method for adaptive coordinated control of pump valves in the water supply process based on data fusion provided by an embodiment of the present application;

[0027] Figure 2 It is a schematic structural diagram of a water supply system for realizing pump valve coordinated control provided by an embodiment of the present application;

[0028] Figure 3 It is a schematic flowchart of a method for adaptive coordinated control of pump valves in the water supply process based on data fusion provided by another embodiment of the present application;

[0029] Figure 4 It is a working flowchart of a pump valve coordinated control state machine in a method for adaptive coordinated control of pump valves in the water supply process based on data fusion provided by an embodiment of the present application;

[0030] Figure 5 It is a flowchart of the pump valve coordinated control steps under a load stable condition in a method for adaptive coordinated control of pump valves in the water supply process based on data fusion provided by an embodiment of the present application;

[0031] Figure 6 It is a schematic internal structure diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The terms "first", "second", "third", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0034] As Figure 1 shown, a method for adaptive coordinated control of pump valves in a water supply process based on data fusion is provided. This method can be executed by a terminal or by a server that communicates with the terminal through a network. Among them, the terminal can be, but is not limited to, various personal computers, laptop computers, smartphones, tablet computers, Internet of Things devices, portable wearable devices, etc. The server can be an independent server or implemented by a server cluster composed of multiple servers.

[0035] Taking the example that this method is executed by the terminal, the following steps are included:

[0036] Step 101, obtain the current liquid level of the steam generator and the change of the current liquid level.

[0037] Figure 2 It is a schematic structural diagram for realizing pump-valve coordinated control of the water supply system. As Figure 2 shown, P1 represents the motor-driven feed water pump (hereinafter referred to as the pump), R1 represents the resistance of pipeline 1, R2 represents the resistance of pipeline 2, R L represents the motor-driven feed water regulating valve (hereinafter referred to as the valve), and P0 represents the steam generator.

[0038] The current liquid level of the steam generator is the liquid level height at the current moment, and the change of the current liquid level is the change rate of the liquid level over a period of time. It can be a positive value, indicating that the current liquid level is on the rise, or it can be a negative value, indicating that the current liquid level is on the decline.

[0039] Step 102, calculate the actual position of the current liquid level in the liquid level range based on the current liquid level.

[0040] Among them, the liquid level range includes the maximum and minimum liquid levels of the steam generator.

[0041] Step 103: Determine the target feed water flow according to the actual position and change of the current liquid level.

[0042] Among them, the target feed water flow is the feed water flow demand value of the steam generator at the next moment of the current moment.

[0043] Step 104: When the current is in a steady-state condition, perform valve opening adjustment until the valve opening reaches the upper limit value and the target feed water flow still has an upward trend at this time, or the valve opening reaches the lower limit value and the target feed water flow still has a downward trend at this time, and then switch to pump speed adjustment.

[0044] Among them, valve opening adjustment includes keeping the pump speed unchanged and adjusting the valve opening according to the target feed water flow, and pump speed adjustment includes keeping the valve opening unchanged and adjusting the pump speed according to the target feed water flow to ensure that the pressure difference before and after the valve is maintained at a fixed value.

[0045] Step 105: When the current is in a dynamic condition, perform pump speed adjustment until the pump speed reaches the speed corresponding to the steady-state condition, and then switch to valve opening adjustment.

[0046] After step 103 and before step 104, the above-mentioned pump-valve adaptive coordination control method for the feed water process based on data fusion further includes judging whether the current is in a dynamic condition or a steady-state condition according to the change of the current liquid level. For example, if the absolute value of the change of the current liquid level is not greater than the set value (such as 10%), it is judged that the current is in a steady-state condition, otherwise, the current is in a dynamic condition.

[0047] In the above-mentioned pump-valve adaptive coordination control method for the feed water process based on data fusion, the feed water flow of the steam generator can be adjusted according to the target feed water flow; when the current is in a steady-state condition, keep the pump speed unchanged and adjust the valve opening, so as to realize the dynamic adjustment of the small feed water flow of the steam generator; when the current is in a dynamic condition, keep the valve opening unchanged and adjust the pump speed, so as to realize the dynamic adjustment of the medium feed water flow required by the steam generator. Since this method takes into account the characteristics of the dynamic change of the target feed water flow in the actual feed water process, and can realize the dynamic adjustment of the small feed water flow required by the steam generator by keeping the pump speed unchanged and adjusting the valve opening under the steady-state condition, it can achieve the purpose of reducing the energy consumption of the pump and realizing the energy-saving operation of the entire feed water system.

[0048] In one embodiment, as Figure 3As shown in the figure, a method for adaptive coordinated control of pump valves in the water supply process based on data fusion is provided. This method changes the goal of traditional liquid level control to dynamic flow following. According to the characteristics of liquid level changes, the target water supply flow is dynamically adjusted. Using the target water supply flow and the current actual water supply flow as the control deviation, the pump valves are coordinately controlled. Taking the water supply flow as the first control target and the liquid level control as the secondary control target, this control can effectively avoid the pump power loss caused by maintaining the pressure difference before and after the water supply regulating valve, can use the external operating characteristics of the pump as a constraint to improve the working efficiency of the pump, and reduce the vibration and noise in the entire system. The method includes the following steps:

[0049] Step 1: Collect the current liquid level signal (i.e., liquid level height) of the steam generator, denoted as L and store it. The sampling period of the liquid level signal is 600 ms. According to the recent 10 historical liquid level signals, judge the change situation of the current liquid level, denoted as δL.

[0050] Step 2: Set the maximum liquid level L max and the minimum liquid level L min of the steam generator, and calculate the actual position EL of the current liquid level in the liquid level range. The specific calculation formula is as follows:

[0051] EL = (L - L min ) / (L max - L min ) * 100%.

[0052] Step 3: According to EL and δL, calculate the target water supply flow Qp target : When EL is lower than the first value (e.g., 20%), set the value of Qp target to the maximum water supply demand flow Qp max , increase the water supply to the steam generator to achieve rapid water replenishment; when EL is greater than the second value (e.g., 75%), set the value of Qp target to 0, reduce the water supply to the steam generator; when EL returns to the intermediate value (e.g., 50%), calculate the target water supply flow according to the following formula: Qp target = A d * δL + 0.5 * EL * (L max - L min ), where A 2 is the fusion coefficient. d is the fusion coefficient.

[0053] Step 4: Use historical water supply data for data fusion processing to determine the fusion coefficient A in the target water supply flow calculation formula dThe historical feedwater data here mainly considers relevant parameters such as feedwater flow measurement values, pump speed, valve opening, the liquid level of the steam generator and its change conditions, and steam quality. Through multi-source data fusion, an accurate estimation of the target feedwater flow is achieved.

[0054] In one embodiment, the method for determining the fusion coefficient A d includes establishing an initial feedwater flow control model, which is a machine learning model; using the historical feedwater data as a training set to train the initial feedwater flow control model, and obtaining a trained feedwater flow control model; calculating the fusion coefficient based on the trained feedwater flow control model.

[0055] Step 5, after calculating the target feedwater flow Qp based on the change condition of the liquid level target transfer Qp target to the pump-valve adaptive coordination control module to achieve flow control, and at the same time, δL characterizing the change condition of the liquid level is also passed into the pump-valve adaptive coordination control module to determine whether the current is in a dynamic working condition or a steady-state working condition.

[0056] Step 6, the specific working process of the pump-valve adaptive coordination control module is as shown in Figure 4 and Figure 5 First, relevant signals are passed into the pump-valve adaptive coordination control state machine shown in Figure 4 The steady-state / dynamic result value of the current process is output through the state machine. Based on the determination result of the state machine, enter the process shown in Figure 5

[0057] Step 7, as shown in Figure 5 When starting to run, the pump automatically runs to the first ideal speed (also called the first speed) n0, and by default enters the steady-state working condition to ensure the initial liquid level.

[0058] Step 8, adjust the valve opening according to the target feedwater flow Qp target During the valve opening adjustment process, the liquid level and the change condition of the liquid level are monitored in real time. According to the change condition of the liquid level, it is judged whether the current pump-valve coordination is in the steady-state adjustment (i.e., valve opening adjustment) or the dynamic adjustment mode (i.e., pump speed adjustment).

[0059] Step 9, during steady-state adjustment, the valve acts within the set opening range (for example, 30%-75%, where 75% is the upper limit value of the opening and 30% is the lower limit value of the opening). During dynamic adjustment, the pump maintains the pressure difference before and after the feedwater valve to ensure the dynamic following effect. If the pump speed is within the range of 30%-70% of the rated speed, the valve opening remains unchanged. If the pump speed exceeds this range, pump-valve coordination control is performed.

[0060] ​Step 10. If the dynamic process ends, the system resumes the steady-state regulation strategy and performs precise flow regulation by fixing the pump speed and the opening degree of the regulating valve. The criterion for the end of the dynamic process is to comprehensively evaluate the difference between the actual feed water flow and the target feed water flow based on historical feed water data.

[0061] The pump-valve adaptive coordinated control method for the feed water process provided in this embodiment optimizes the original parallel control structure (i.e., the three impulses: steam flow, feed water flow, and steam generator water level are respectively used to calculate the opening degree of the feed water regulating valve through a PID controller) into a series control structure, reduces the PID parameter adjustment process of the three impulses during the liquid level control process, reduces the coupling degree between the liquid level control process and the steam flow and the pump-valve characteristics, and can increase the liquid level holding ability of the steam generator and its rapidity. Moreover, the liquid level control is separated from the feed water flow control. First, the target feed water flow is dynamically calculated through the liquid level control, and the pump-valve coordination strategy is dynamically adjusted through the target feed water flow. At the same time, the pump-valve coordination strategy is pre-regulated based on the change of the liquid level to prevent the hysteresis of the liquid level control and improve the adaptability of the liquid level control to different working conditions. In addition, by introducing a pump-valve adaptive coordinated control state machine, the control strategies for the dynamic working condition and the steady-state working condition are separated. When the feed water system is in a steady-state working condition with little load change, the opening degree of the regulating valve realizes micro flow adjustment to avoid throttling to generate flow noise. When in a dynamic working condition, a pump-adjusting valve following adjustment strategy is adopted to quickly increase the flow rate and the head to ensure the water supply capacity. Thus, it can not only ensure the fast tracking effect of large dynamics but also achieve low-energy consumption steady-state control, realize multi-modal regulation of the feed water process, and improve the intelligent level of the feed water regulation process.

[0062] This application also provides a computer device, and its internal structure diagram can be as Figure 6 shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, 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 and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it realizes a pump-valve adaptive coordinated control method for the feed water process based on data fusion.

[0063] Those skilled in the art can understand that Figure 6 the structure shown in Figure 6 is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0064] As Figure 6 shown, this application also provides a computer device, which includes a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to implement the steps in the above-mentioned method embodiments.

[0065] This application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented. Among them, the computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, DVDs, CD-ROMs, microdrives, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic cards or optical cards, nano-systems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0066] This application also provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0067] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0068] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0069] As described above, these are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and practicing the present disclosure herein, those skilled in the art will readily conceive of embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not described in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0070] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0071] It is easy for those skilled in the art to understand that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for adaptive coordinated control of pump valves in a water supply process based on data fusion, characterized in that, Including: Obtaining the current liquid level of the steam generator and the change of the current liquid level; Calculating the actual position of the current liquid level in the liquid level range based on the current liquid level; Determining the target feed water flow according to the actual position and change of the current liquid level; When in a steady-state condition currently, perform valve opening adjustment until the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, or the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switch to pump speed adjustment. The valve opening adjustment includes keeping the pump speed unchanged and adjusting the valve opening according to the target feed water flow. The pump speed adjustment includes keeping the valve opening unchanged and adjusting the pump speed according to the target feed water flow to ensure that the pressure difference before and after the valve is maintained at a fixed value; When in a dynamic condition currently, perform pump speed adjustment until the pump speed reaches the speed corresponding to the steady-state condition, then switch to valve opening adjustment.

2. The method according to claim 1, wherein The step of, when in a steady-state condition currently, performing valve opening adjustment until the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, or the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switching to pump speed adjustment, includes: When in a steady-state condition currently, keep the pump speed at the first speed and adjust the valve opening according to the target feed water flow; During the valve opening adjustment process, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switch to pump speed adjustment; otherwise, continue to perform valve opening adjustment according to the target feed water flow at this time.

3. The method according to claim 2, wherein The step of, during the valve opening adjustment process, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switching to pump speed adjustment, includes: During the valve opening adjustment process, if the valve opening reaches the upper limit value of the opening and the target feed water flow still has an upward trend at this time, then switch to pump speed adjustment; During the pump speed adjustment process, if the pump speed reaches the second speed, then switch to valve opening adjustment, and the second speed is the pump speed corresponding to the steady-state condition during the feed water process of the steam generator; During the valve opening adjustment process, if the valve opening reaches the lower limit value of the opening and the target feed water flow still has a downward trend at this time, then switch to pump speed adjustment; otherwise, continue to perform valve opening adjustment according to the target feed water flow at this time.

4. The method according to claim 1, wherein The method further includes: Judging whether it is in a dynamic condition or a steady-state condition according to the change of the current liquid level.

5. The method according to claim 1, characterized in that, The step of determining the target feed water flow according to the actual position and change of the current liquid level includes: When the actual position of the current liquid level is less than the first value, set the target feed water flow to the maximum value of the feed water demand flow, increase the feed water of the steam generator until the actual position of the liquid level reaches the intermediate value, and then recalculate the target feed water flow according to the actual position and change of the liquid level at this time; When the actual position of the current liquid level is greater than the second value, set the target feed water flow to 0, reduce the feed water of the steam generator until the actual position of the liquid level reaches the intermediate value, and then recalculate the target feed water flow according to the actual position and change of the liquid level at this time; When the actual position of the current liquid level is not less than the first value and not greater than the second value, calculate the target feed water flow according to the actual position and the change of the current liquid level.

6. The method according to claim 5, wherein Determining the target feed water flow according to the actual position and the change of the current liquid level includes: Calculate the target feed water flow according to the following formula: Qp target = A d *δL + 0.5*EL*(L max - L min ) 2 Among them, A d is the fusion coefficient, δL is the change of the current liquid level, EL is the actual position of the current liquid level, and L max is the maximum liquid level of the steam generator, and L min is the minimum liquid level of the steam generator.

7. The method according to claim 6, characterized in that, The determination method of the fusion coefficient includes: Obtain historical feed water data, where the historical feed water data includes historical feed water flow measurement values and historical operation data, and the historical operation data includes pump speed, valve opening, the liquid level of the steam generator and its change, and steam quality; Establish an initial feed water flow control model, where the initial feed water flow control model is a machine learning model; Input the historical operation data into the initial feed water flow control model to obtain the sample feed water flow; Train the initial feed water flow control model in the direction of minimizing the difference between the sample feed water flow and the historical feed water flow measurement value until reaching the training stop condition and then stop to obtain the trained feed water flow control model; According to the liquid levels of multiple steam generators in the historical operation data, calculate the actual position corresponding to each liquid level in the liquid level range, and input the change of the liquid level and the calculated actual position of the liquid level into the trained feed water flow control model to obtain the predicted feed water flow; Substitute the multiple predicted feedwater flow rates and the actual positions and change conditions of the corresponding liquid levels into the calculation formula of the feedwater flow rate respectively to obtain multiple candidate fusion coefficients. The calculation formula of the feedwater flow rate is Qp = A * δL + 0.5 * EL * (L max -L min ) 2 , where A is the candidate fusion coefficient, δL is the change condition of the current liquid level, EL is the actual position of the current liquid level, L max is the maximum liquid level of the steam generator, and L min is the minimum liquid level of the steam generator; Take the average value of multiple candidate fusion coefficients as the fusion coefficient.

8. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the method according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-7.

10. A computer program product, characterized in that, It includes a computer program, and when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-7.

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