A brackish water desalination control method and device, electronic equipment and storage medium

Abstract

The application provides a brackish water desalination control method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a power fluctuation characteristic parameter of a photovoltaic assembly; determining a current deposition uniformity index of a reverse osmosis membrane assembly by using a mapping relationship between the power fluctuation characteristic parameter and the deposition uniformity index of a membrane surface; and performing fluctuation stability adjustment on the output pressure of a high-pressure pump based on a mapping relationship between the deposition uniformity index and the high-pressure pump pressure fluctuation. The application can effectively cope with the power instability of photovoltaic direct drive, improve the membrane surface deposition uniformity through dynamic pressure adjustment, and further improve the desalination efficiency of brackish water.

Description

Technical Field

[0001] This invention relates to the field of water desalination technology, and more specifically, to a brackish water desalination control method, apparatus, electronic device, and storage medium. Background Technology

[0002] While photovoltaic direct-drive reverse osmosis systems eliminate the need for energy storage batteries, reducing costs and maintenance complexity, fluctuations in photovoltaic power directly lead to fluctuations in the high-pressure pump flow rate. These flow rate fluctuations result in significant differences in the deposition density of pollutants in different areas of the membrane surface, creating an uneven distribution of contaminants.

[0003] Uneven deposition leads to an imbalance in membrane surface resistance distribution, resulting in a significant decrease in the permeate flux of the reverse osmosis membrane module and a reduction in desalination efficiency. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a brackish water desalination control method, apparatus, electronic device and storage medium to improve the efficiency of brackish water desalination.

[0005] In a first aspect, a brackish water desalination control method is provided, applied to a photovoltaic direct-drive desalination system. The desalination system includes photovoltaic modules, a high-pressure pump, and a reverse osmosis membrane module, wherein the photovoltaic modules directly power the high-pressure pump; the method includes: Obtain the power fluctuation characteristic parameters of photovoltaic modules; By utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface, the current deposition uniformity index of the reverse osmosis membrane module is determined. Based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the output pressure of the high-pressure pump is regulated to stabilize the fluctuation.

[0006] Optionally, obtaining the power fluctuation characteristic parameters of the photovoltaic module within a preset window includes: Collect the output power of photovoltaic modules within a preset time window; A time-series analysis of the output power is performed to extract power fluctuation characteristic parameters, including fluctuation amplitude, fluctuation frequency, and fluctuation duration.

[0007] Optionally, the current deposition uniformity index of the reverse osmosis membrane module can be determined by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface, including: The duration of the fluctuation is divided into multiple consecutive time segments, and a representative time point is selected for each time segment; For each point in time, the instantaneous risk contribution value is calculated based on the fluctuation amplitude and fluctuation frequency at that point in time; The instantaneous risk contribution values ​​at all time points are aggregated to obtain the pollutant deposition uniformity index.

[0008] Optionally, for each time point, the instantaneous risk contribution value is calculated based on the volatility amplitude and volatility frequency at that time point, including: For each time point, the instantaneous fluctuation intensity is calculated based on the product of the fluctuation amplitude and the fluctuation frequency at that time point; Based on the exponential decay relationship between this time point and the preset pollutant sedimentation characteristic time constant, the pollutant sedimentation decay factor at this time point is calculated. Based on the phase coupling relationship between the fluctuation frequency, the time point, and the preset initial phase angle at that time point, the pollutant distribution non-uniformity modulation factor at that time point is calculated. The instantaneous risk contribution value at that time point is obtained by multiplying the instantaneous fluctuation intensity, the pollutant deposition attenuation factor, and the pollutant distribution non-uniformity modulation factor.

[0009] Optionally, based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the output pressure of the high-pressure pump is regulated to stabilize the fluctuation, including: Based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the pressure fluctuation adjustment amount is determined. The target output pressure of the high-pressure pump is calculated based on the pressure fluctuation adjustment amount and the actual pressure value at the outlet of the high-pressure pump. Send a pressure regulation command to the pressure regulation unit of the high-pressure pump to adjust the output pressure of the high-pressure pump to the target output pressure value.

[0010] Optionally, based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the pressure fluctuation adjustment amount is determined, including: Calculate the absolute value of the deviation between the deposition uniformity index and the preset target deposition uniformity index; Based on the absolute value of the deviation and the preset mapping function between the deposition uniformity index deviation and the pressure fluctuation adjustment amount, the pressure adjustment amplitude and adjustment direction are calculated. The pressure fluctuation adjustment amount is calculated based on the pressure adjustment range and direction, combined with the preset pressure compensation coefficient.

[0011] Optionally, the method also includes: The output power of the photovoltaic module is compared with a preset power threshold. When the output power is lower than the power threshold, the power supply to the high-pressure pump is cut off.

[0012] Secondly, a brackish water desalination control device is provided, applied to a photovoltaic direct-drive desalination system. The desalination system includes photovoltaic modules, a high-pressure pump, and a reverse osmosis membrane module, wherein the photovoltaic modules directly power the high-pressure pump; the device includes: The acquisition unit is used to acquire the power fluctuation characteristic parameters of the photovoltaic module; The determination unit is used to determine the current deposition uniformity index of the reverse osmosis membrane module by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface. The regulating unit is used to regulate the output pressure of the high-pressure pump to stabilize the fluctuations based on the mapping relationship between the deposition uniformity index and the pressure fluctuations of the high-pressure pump.

[0013] Thirdly, an electronic device is provided, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements any of the methods of the first aspect.

[0014] Fourthly, a computer-readable storage medium is provided, wherein a computer program is stored therein, and when the computer program is executed by a processor, it implements any of the methods of the first aspect.

[0015] This invention provides a brackish water desalination control method, apparatus, electronic device, and storage medium. It acquires the power fluctuation characteristic parameters of a photovoltaic module; utilizes the mapping relationship between these parameters and the deposition uniformity index of the membrane surface to determine the current deposition uniformity index of the reverse osmosis membrane module; and based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, it regulates the output pressure of the high-pressure pump to stabilize the fluctuation. This invention effectively addresses the power instability of direct-drive photovoltaic systems, improves membrane deposition uniformity through dynamic pressure adjustment, and thus enhances the desalination efficiency of brackish water.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of a brackish water desalination control method provided in an embodiment of the present invention is shown; Figure 2 A flowchart of another brackish water desalination control method provided by an embodiment of the present invention is shown; Figure 3 This diagram illustrates the structure of a brackish water desalination control device provided in an embodiment of the present invention. Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present invention is shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] This invention provides a brackish water desalination control method, applied to a photovoltaic direct-drive desalination system. The system adopts a photovoltaic direct-drive architecture, eliminating the need for energy storage batteries and inverters. Through a highly integrated structure, it achieves compact installation, low-cost operation and maintenance, and unattended operation.

[0021] The desalination system includes photovoltaic modules, a high-pressure pump, a reverse osmosis membrane module, a pretreatment module, an elevated water tank, and a controller. All components are integrated into the same corrosion-resistant aluminum alloy frame. The bottom of the frame is equipped with movable casters and fixed supports, which facilitates the transportation and movement of the device and allows it to be fixed in place during use, adapting to the complex terrain of remote and arid areas. The frame surface is treated with anti-corrosion coating to extend the service life of the device and adapt to harsh environments with drought and frequent sandstorms.

[0022] Specifically, the structure, connections, and working principles of each part are as follows: Photovoltaic modules: They use monocrystalline silicon photovoltaic panels, which are fixedly installed on the top of the frame to receive solar energy and convert it into direct current to directly power the high-voltage pump without the need for energy storage batteries; The power of the photovoltaic modules is designed to match the rated power of the photovoltaic high-voltage pump, ensuring that the electrical energy output by the photovoltaic modules can meet the normal operation requirements of the photovoltaic high-voltage pump under daytime sunshine conditions, and is suitable for the abundant sunshine conditions in remote and arid areas.

[0023] High-pressure pump: Electrically connected to the photovoltaic module, integrated in the middle of the frame, its inlet is connected to an external brackish water source (such as an underground brackish water well or brackish water storage tank) through a brackish water inlet pipe, and its outlet is sealed to the inlet of the reverse osmosis membrane module. The high-pressure pump adopts a DC drive mode and can directly receive DC power output from the photovoltaic module without the need for an additional inverter, further reducing system costs and energy consumption. Its rated pressure is designed according to the working pressure requirements of the reverse osmosis membrane module, ensuring that it can provide sufficient driving force for brackish water to pass through the reverse osmosis membrane, with a desalination rate of over 90%, meeting the water quality requirements for agricultural irrigation.

[0024] Reverse osmosis membrane module: It adopts a polyamide composite reverse osmosis membrane, which is integrated on one side of the photovoltaic high-pressure pump and fixedly connected to the high-pressure pump and the mounting frame to form an integrated structure; The inlet of the reverse osmosis membrane module is connected to the outlet of the photovoltaic high-pressure pump. The freshwater outlet is connected to the high-level water tank through the freshwater outlet pipeline. The concentrated brine outlet extends to the outside of the device through the concentrated water discharge pipeline for discharging the desalinated concentrated brine. The concentrated brine can be recycled for non-irrigation scenarios according to actual needs, avoiding water waste.

[0025] Pretreatment components: Located between the brackish water inlet pipe and the high-pressure pump inlet, including a quartz sand filter and a precision filter, used to remove suspended solids, silt, colloids and other impurities from the brackish water, prevent impurities from clogging the reverse osmosis membrane, extend the service life of the reverse osmosis membrane and reduce maintenance costs. The filtration precision of the pretreatment components is designed according to the tolerance requirements of the reverse osmosis membrane to ensure that the brackish water entering the reverse osmosis membrane meets the treatment standards.

[0026] Elevated water tank: Installed below the photovoltaic module and fixedly connected to the mounting frame. Its inlet is connected to the freshwater outlet of the reverse osmosis membrane module, and the outlet is connected to the irrigation pipeline to transport the desalinated freshwater to the irrigation area. The elevated water tank adopts a sealed design to prevent freshwater from being contaminated. Its volume is designed according to the daily water consumption of small-scale irrigation, ensuring that the freshwater produced during the day can meet the subsequent irrigation needs. The installation height of the elevated water tank is higher than the ground level of the irrigation area, and freshwater gravity-fed irrigation is achieved, eliminating the need for an additional irrigation pump and further reducing energy consumption and costs.

[0027] Controller: A PL controller is adopted and integrated on the side of the frame. It is electrically connected to the photovoltaic module and the high-pressure pump to monitor the power generation of the photovoltaic module, the operating status of the high-pressure pump, the inlet and outlet pressure of the reverse osmosis membrane module, and the liquid level of the high-level water tank, etc. When the photovoltaic module's power generation is insufficient (such as on cloudy days or at dusk), the control module automatically cuts off the power to the photovoltaic high-pressure pump to prevent the equipment from running dry and being damaged. When the liquid level in the high-level water tank reaches the preset upper limit, the control module automatically stops the operation of the photovoltaic high-pressure pump to prevent fresh water from overflowing. When the liquid level is lower than the preset lower limit, the control module automatically starts the photovoltaic high-pressure pump to resume the desalination operation, realizing automatic control of the system without manual operation, which is suitable for unattended scenarios in remote areas.

[0028] While photovoltaic direct-drive reverse osmosis systems eliminate the need for energy storage batteries, reducing costs and maintenance complexity, fluctuations in photovoltaic power directly lead to fluctuations in the high-pressure pump flow rate. These flow rate fluctuations result in significant differences in the deposition density of pollutants in different areas of the membrane surface, leading to uneven pollutant distribution.

[0029] Uneven deposition leads to an imbalance in membrane surface resistance distribution, resulting in a significant decrease in the permeate flux of the reverse osmosis membrane module and a reduction in desalination efficiency.

[0030] Therefore, this embodiment provides a pressure compensation method to ensure the pressure stability of the reverse osmosis membrane module during operation and reduce the impact of flow fluctuations.

[0031] like Figure 1 As shown, the controller is the main body executing this method, and the method includes the following steps: Step S101: Obtain the power fluctuation characteristic parameters of the photovoltaic module.

[0032] The output power of photovoltaic modules is significantly random and volatile due to environmental factors such as light intensity, cloud cover, and temperature changes.

[0033] For example, under sunny weather conditions, the power output of photovoltaic modules may exhibit sinusoidal fluctuations; while under cloudy weather conditions, the power output may experience a step-like change.

[0034] In one feasible implementation, obtaining the power fluctuation characteristic parameters of the photovoltaic module within a preset window includes: Step S101A: Collect the output power of the photovoltaic module within a preset time window.

[0035] For example, the instantaneous output power of a photovoltaic module can be collected by a power sensor or smart meter installed at the output end of the photovoltaic module.

[0036] For example, a sliding time window (e.g., a window of 60 seconds) can be set up to continuously acquire power data sequences within the window in fixed steps (e.g., moving once every 5 seconds). .

[0037] Step S101B: Perform time-series analysis on the output power and extract power fluctuation characteristic parameters.

[0038] Specifically, signal processing algorithms (such as Fourier transform, wavelet transform, or statistical moment calculation) can be used to analyze the acquired time-series data and extract three key feature parameters: Fluctuation amplitude: Indicates the maximum deviation of power change, usually defined as the difference between the maximum and minimum power within a window, or the standard deviation.

[0039] Fluctuation frequency: Represents the number of power fluctuation cycles per unit time, reflecting the speed of fluctuation.

[0040] Fluctuation duration: Indicates the cumulative duration for which power remains at an abnormal level (such as being below a certain percentage of the rated value).

[0041] In this embodiment of the invention, by extracting the feature parameters of these three dimensions, the intensity, rhythm and persistence of photovoltaic power fluctuations can be comprehensively characterized, providing rich data support for subsequent deposition risk assessment.

[0042] Step S102: Determine the current deposition uniformity index of the reverse osmosis membrane module by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface.

[0043] The deposition of contaminants on the surface of reverse osmosis membranes directly affects membrane flux and lifespan. Power fluctuations in photovoltaic modules can cause fluctuations in the outlet pressure of the high-pressure pump, which in turn alters the shear force distribution on the membrane surface, affecting the sedimentation and deposition patterns of contaminants.

[0044] This step involves establishing a database beforehand through experiments or simulations to record film deposition uniformity data under different power fluctuation characteristics (such as amplitude, frequency, and duration) and constructing a mapping model.

[0045] In actual operation, the feature parameters obtained in step S101 are input into the model to calculate the current deposition uniformity index.

[0046] Example: If the power fluctuation is severe and lasts for a long time, it may cause the local flow rate on the membrane surface to be too low, forming a severe concentration polarization zone. At this time, the deposition uniformity index will increase significantly.

[0047] Step S103: Based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the output pressure of the high-pressure pump is regulated to stabilize the fluctuation.

[0048] When uneven deposition is detected on the membrane surface, simply relying on constant pressure cannot effectively suppress fouling and may even exacerbate local blockage. This step improves deposition uniformity by actively adjusting the pressure of the high-pressure pump to generate a specific pressure fluctuation pattern and using hydrodynamic effects to flush the membrane surface.

[0049] For example, if the deposition uniformity index indicates severe fouling on the right side of the membrane, the control system can instruct the high-pressure pump to generate pressure pulsations at a specific frequency to increase the turbulence intensity on the membrane surface and promote the removal of pollutants.

[0050] Through the above steps, the embodiments of the present invention can effectively address the power instability of photovoltaic direct drive, improve the uniformity of membrane deposition by dynamically adjusting the pressure, thereby improving the desalination efficiency of brackish water and extending the service life of the membrane module.

[0051] Based on the above embodiments, such as Figure 2 As shown, by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface, the current deposition uniformity index of the reverse osmosis membrane module is determined, including: Step S102A: Divide the duration of the fluctuation into multiple consecutive time segments, and select a representative time point for each time segment.

[0052] Specifically, assuming the duration of the fluctuation is Divide it into equal parts There are 1 time segments, each segment having a duration of 1. .

[0053] For the A segment was selected, and its midpoint was chosen as a representative time point. .

[0054] For example, if the fluctuation lasts for 100 seconds and is divided into 10 segments, then each segment is 10 seconds long, with representative time points of 5s, 15s, ..., 95s.

[0055] Step S102B: For each time point, calculate the instantaneous risk contribution value based on the fluctuation amplitude and fluctuation frequency at that time point.

[0056] At each representative time point Combined with the fluctuation range at that moment and fluctuation frequency Calculate its instantaneous risk contribution to film deposition.

[0057] In a feasible implementation, for each time point, the instantaneous risk contribution value is calculated based on the fluctuation amplitude and fluctuation frequency at that time point, including: Step S102B1: For each time point, calculate the instantaneous fluctuation intensity based on the product of the fluctuation amplitude and the fluctuation frequency at that time point.

[0058] Instantaneous fluctuation intensity The formula is as follows:

[0059] in, For time points Power fluctuation range at the location (unit: kW or relative percentage). This represents the fluctuation frequency (in Hz) at that point in time. This indicator reflects the energy impact intensity of power changes per unit time.

[0060] Step S102B2: Based on the exponential decay relationship between this time point and the preset pollutant sedimentation characteristic time constant, calculate the pollutant sedimentation decay factor at this time point.

[0061] The pollutant settling characteristic time constant (determined by the properties of the membrane material and the characteristics of the feed solution, and needs to be calibrated experimentally).

[0062] Specifically, calculate the attenuation factor. The formula is as follows:

[0063] in, This represents the time elapsed since the start of the fluctuation. is the time constant characteristic of settlement.

[0064] This factor is used to simulate the physical process by which the impact of newly generated disturbances on deposited contaminants gradually weakens over time.

[0065] Step S102B3: Based on the phase coupling relationship between the fluctuation frequency, the time point, and the preset initial phase angle at the time point, calculate the pollutant distribution non-uniformity modulation factor at the time point.

[0066] Considering the resonance effect between the fluctuation frequency and the pollutant diffusion process, this embodiment introduces the concept of phase coupling. The modulation factor is then calculated. The formula is as follows:

[0067] in, Coupling coefficient (0 <k<1), This is the preset initial phase angle.

[0068] When the fluctuation frequency is close to the natural frequency of pollutant diffusion, An increase indicates that the non-uniformity has been amplified.

[0069] Step S102B4: Multiply the instantaneous fluctuation intensity, the pollutant deposition attenuation factor, and the pollutant distribution non-uniformity modulation factor to obtain the instantaneous risk contribution value at that time point.

[0070] Taking into account the above three factors, the calculation time point Instantaneous risk contribution value The formula is as follows:

[0071] Right now:

[0072] The meanings of each parameter are the same as above, and will not be repeated here.

[0073] In this embodiment of the invention, by constructing a multidimensional mapping model that includes intensity, attenuation and phase coupling, the specific impact of power fluctuations at each moment on film deposition can be accurately quantified, providing a solid physical basis for subsequent overall evaluation.

[0074] Step S102C: Aggregate the instantaneous risk contribution values ​​at all time points to obtain the pollutant deposition uniformity index.

[0075] In this step, the instantaneous risk contribution values ​​of all time segments are aggregated. Assume there are a total of N time segments, and the deposition uniformity index... The calculation formula is:

[0076] Alternatively, a weighted aggregation method can be used, with weights... The settings can be adjusted based on the length or importance of the time segment:

[0077] in, The instantaneous risk contribution value is calculated in step S102A4.

[0078] In this embodiment of the invention, by aggregating the instantaneous risk values ​​of all time segments, a scalar index is obtained that comprehensively reflects the uniformity of film deposition throughout the entire fluctuation cycle. The larger this index is, the more uneven the film deposition and the higher the risk of contamination.

[0079] In this embodiment of the invention, by discretizing the continuous fluctuation process into multiple time points for evaluation, the dynamic risk differences at different stages of the fluctuation process can be captured, avoiding information loss caused by simple averaging and improving the accuracy of the deposition uniformity index calculation.

[0080] Based on the above embodiments, and based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the fluctuation stabilization adjustment of the output pressure of the high-pressure pump includes: Step S103A: Based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, determine the pressure fluctuation adjustment amount.

[0081] In one feasible implementation, the pressure fluctuation adjustment amount is determined based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, including: Step S103A1: Calculate the absolute value of the deviation between the deposition uniformity index and the preset target deposition uniformity index.

[0082] Target deposition uniformity index This is usually determined through optimization experiments, for example, 0.85. Calculate the current index. absolute value of deviation from target value :

[0083] This deviation value reflects the difference between the current film deposition state and the ideal state.

[0084] Step S103A2: Calculate the pressure adjustment amplitude and direction based on the absolute value of the deviation and the preset mapping function between the deposition uniformity index deviation and the pressure fluctuation adjustment amount.

[0085] Using the preset mapping function Deviation This is converted into a pressure compensation quantity. The mapping function can be linear or nonlinear (such as a piecewise function).

[0086] Example of calculation formula:

[0087] in, For the adjustment range of pressure fluctuation, This is the proportionality coefficient.

[0088] At the same time, determine the direction of adjustment based on the cause of the deviation: if This indicates uneven deposition, which usually requires increasing the pressure fluctuation amplitude to enhance scouring. In this case, the adjustment direction is positive (increasing pressure or fluctuation); otherwise, it is negative.

[0089] Step S103A3: Calculate the pressure fluctuation adjustment amount based on the pressure adjustment amplitude and direction, combined with the preset pressure compensation coefficient.

[0090] This embodiment introduces a pressure compensation coefficient. (To account for system response lag or nonlinearity), the final determined pressure fluctuation adjustment amount for:

[0091] in, This is a sign function used to determine the adjustment direction.

[0092] In this embodiment of the invention, the abstract "deposition uniformity index" is transformed into a specific "pressure fluctuation adjustment amount" through explicit deviation calculation and mapping function, thus achieving a seamless connection from state assessment to control execution.

[0093] Step S103B: Calculate the target output pressure value of the high-pressure pump based on the pressure fluctuation adjustment amount and the actual pressure value at the outlet of the high-pressure pump.

[0094] Obtain the real-time reading of the pressure sensor at the outlet of the high-pressure pump. .

[0095] The pressure fluctuation adjustment amount calculated in step S103A3 The target output pressure value is obtained by superimposing it onto the actual pressure value. :

[0096] Note: Here It can be positive or negative, representing an increase or decrease in pressure.

[0097] In some control strategies, it can also be based on baseline pressure. Make corrections, that is It depends on the control architecture design.

[0098] Step S103C: Send a pressure regulation command to the pressure regulation unit of the high-pressure pump to adjust the output pressure of the high-pressure pump to the target output pressure value.

[0099] The control module generates a value containing the target pressure. Control commands are sent to the pressure regulating valve of the high-pressure pump via a communication interface (such as Modbus, CAN bus, or 4-20mA analog signal).

[0100] After receiving the command, the high-pressure pump automatically adjusts the motor speed or valve opening to stabilize the outlet pressure. .

[0101] Example: If , ,but The high-pressure pump receives a command and increases the motor frequency until the pressure reaches 6.2 MPa.

[0102] In this embodiment of the invention, closed-loop feedback control ensures that the high-pressure pump can accurately output the required pressure, thereby achieving effective control of film deposition.

[0103] Based on the above embodiments, the method further includes: Step S104: Compare the output power of the photovoltaic module with a preset power threshold.

[0104] Example: Set the threshold to 30% of the high-pressure pump's rated power. When cloudy weather causes the power to drop to 25%, the protection logic is triggered.

[0105] Step S105: When the output power is lower than the power threshold, cut off the power supply to the high-pressure pump.

[0106] The circuit connection between the photovoltaic module and the high-pressure pump can be physically disconnected using a relay or solid-state switch.

[0107] Example: In the evening, when the light intensity decreases and the power remains below the threshold for more than the set delay time (e.g., 5 seconds), the system automatically disconnects the high-pressure pump power supply and enters standby mode.

[0108] After the power is cut off, the dimming system can enter hibernation or standby mode. When the light source is restored, and the output power is above the threshold again and remains stable for a period of time, the system can automatically attempt to restart the high-pressure pump.

[0109] In this embodiment of the invention, by setting a power threshold and an automatic cut-off mechanism, the problems of equipment idling, overheating or damage caused by insufficient power supply in photovoltaic direct drive systems under low light conditions are effectively avoided, significantly improving the reliability and safety of the system.

[0110] Based on the same inventive concept, a brackish water desalination control device is provided, applied to a photovoltaic direct-drive desalination system. The desalination system includes photovoltaic modules, a high-pressure pump, and a reverse osmosis membrane module, wherein the photovoltaic modules directly power the high-pressure pump; Figure 3 As shown, the device includes: Acquisition unit 301 is used to acquire power fluctuation characteristic parameters of photovoltaic modules; The determination unit 302 is used to determine the current deposition uniformity index of the reverse osmosis membrane module by utilizing the mapping relationship between power fluctuation characteristic parameters and deposition uniformity index of the membrane surface. The regulating unit 303 is used to regulate the output pressure of the high-pressure pump to stabilize the fluctuation based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump.

[0111] Based on the same technical concept, embodiments of the present invention also provide an electronic device, such as... Figure 4 As shown, it includes a processor 401, a communication interface 402, a memory 403, and a communication bus 404, wherein the processor 401, the communication interface 402, and the memory 403 communicate with each other through the communication bus 404.

[0112] Memory 403 is used to store computer programs; The processor 401 is used to execute the program stored in the memory 403 to implement the steps of the brackish water desalination control method.

[0113] The communication bus mentioned in the above electronic devices can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0114] The communication interface is used for communication between the aforementioned electronic devices and other devices.

[0115] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0116] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0117] In another embodiment of the present invention, a computer-readable storage medium is also provided, which stores a computer program that, when executed by a processor, implements the steps of any of the brackish water desalination control methods described above. Specific implementation details can be found in the method embodiments and will not be repeated here.

[0118] The brackish water desalination control device provided in this embodiment of the invention can be specific hardware on a device or software or firmware installed on the device. The implementation principle and technical effects of the device provided in this embodiment of the invention are the same as those in the foregoing method embodiments. For the sake of brevity, any parts not mentioned in the device embodiments can be referred to the corresponding content in the foregoing method embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can all be referred to the corresponding processes in the above method embodiments, and will not be repeated here.

[0119] In the embodiments provided by this invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0120] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0121] In addition, the functional units in the embodiments provided by the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0122] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0123] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0124] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling brackish water desalination, characterized in that, A photovoltaic-driven desalination system, comprising photovoltaic modules, a high-pressure pump, and a reverse osmosis membrane module, wherein the photovoltaic modules directly power the high-pressure pump; the method includes: Obtain the power fluctuation characteristic parameters of photovoltaic modules; The current deposition uniformity index of the reverse osmosis membrane module is determined by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface. Based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the output pressure of the high-pressure pump is regulated to stabilize the fluctuation.

2. The method according to claim 1, characterized in that, The method for obtaining the power fluctuation characteristic parameters of the photovoltaic module within a preset window includes: The output power of the photovoltaic module is collected within a preset time window; A time-series analysis is performed on the output power to extract the power fluctuation characteristic parameters, which include fluctuation amplitude, fluctuation frequency, and fluctuation duration.

3. The method according to claim 2, characterized in that, The method of determining the current deposition uniformity index of the reverse osmosis membrane module by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface includes: The duration of the fluctuation is divided into multiple consecutive time segments, and a representative time point is selected for each time segment; For each point in time, the instantaneous risk contribution value is calculated based on the fluctuation amplitude and fluctuation frequency at that point in time; The instantaneous risk contribution values ​​at all time points are aggregated to obtain the pollutant deposition uniformity index.

4. The method according to claim 3, characterized in that, The calculation of the instantaneous risk contribution value for each time point, based on the fluctuation amplitude and fluctuation frequency at that time point, includes: For each time point, the instantaneous fluctuation intensity is calculated based on the product of the fluctuation amplitude and the fluctuation frequency at that time point; Based on the exponential decay relationship between this time point and the preset pollutant sedimentation characteristic time constant, the pollutant sedimentation decay factor at this time point is calculated. Based on the phase coupling relationship between the fluctuation frequency, the time point, and the preset initial phase angle at that time point, the pollutant distribution non-uniformity modulation factor at that time point is calculated. The instantaneous risk contribution value at that time point is obtained by multiplying the instantaneous fluctuation intensity, the pollutant sedimentation attenuation factor, and the pollutant distribution non-uniformity modulation factor.

5. The method according to claim 1, characterized in that, The method of stabilizing the output pressure of the high-pressure pump based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump includes: Based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump, the pressure fluctuation adjustment amount is determined. The target output pressure of the high-pressure pump is calculated based on the pressure fluctuation adjustment amount and the actual pressure value at the outlet of the high-pressure pump. A pressure adjustment command is sent to the pressure regulation unit of the high-pressure pump to adjust the output pressure of the high-pressure pump to the target output pressure value.

6. The method according to claim 1, characterized in that, The determination of the pressure fluctuation adjustment amount based on the current deposition uniformity index of the reverse osmosis membrane and the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump includes: Calculate the absolute value of the deviation between the deposition uniformity index and the preset target deposition uniformity index; Based on the absolute value of the deviation and the preset mapping function between the deposition uniformity index deviation and the pressure fluctuation adjustment amount, the pressure adjustment amplitude and adjustment direction are calculated. Based on the pressure adjustment range and direction, and combined with the preset pressure compensation coefficient, the pressure fluctuation adjustment amount is calculated.

7. The method according to claim 2, characterized in that, The method further includes: The output power of the photovoltaic module is compared with a preset power threshold. When the output power is lower than the power threshold, the power supply to the high-pressure pump is cut off.

8. A brackish water desalination control device, characterized in that, A photovoltaic-driven desalination system, comprising photovoltaic modules, a high-pressure pump, and a reverse osmosis membrane module, wherein the photovoltaic modules directly power the high-pressure pump; the device includes: The acquisition unit is used to acquire the power fluctuation characteristic parameters of the photovoltaic module; The determination unit is used to determine the current deposition uniformity index of the reverse osmosis membrane module by utilizing the mapping relationship between power fluctuation characteristic parameters and the deposition uniformity index of the membrane surface. The regulating unit is used to regulate the output pressure of the high-pressure pump to stabilize the fluctuation based on the mapping relationship between the deposition uniformity index and the pressure fluctuation of the high-pressure pump.

9. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; The memory is used to store computer programs; When the processor executes the program stored in the memory, it implements the method described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-7.

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