Hydraulic Dynamic Balance Adjustment Method for Terrain-Adaptive Drip Irrigation System

Abstract

The present invention discloses a terrain-adaptive drip irrigation system and method. The system includes: a main pipe with at least one main valve, and at least a pressure sensor before the main valve, the main valve, a pressure sensor after the main valve, and a main valve opening controller are arranged on the main pipe along the water flow direction; a plurality of branch pipes, the plurality of branch pipes are arranged in parallel and connected to the main pipe; at least a pressure sensor before the branch valve, the branch valve, a pressure sensor after the branch valve are arranged on the branch pipe along the water flow direction, and the branch valve is connected to a branch valve opening controller; the control system is electrically connected to the pressure sensor before the main valve, the pressure sensor after the main valve, the main valve opening controller, the pressure sensor before the branch valve, the pressure sensor after the branch valve, the branch valve opening controller, and the upper computer. The present application also provides an irrigation method. The present application can sense and adjust the water pressure of the irrigation area controlled by each branch pipe in real time, ensuring that the water supply pressure of the irrigation network field water applicators in the terrain-undulating area can maintain dynamic balance.

Description

Technical Field

[0001] The present application relates to the technical field of irrigation, and specifically to a method for dynamically adjusting the hydraulic pressure balance of a terrain-adaptive drip irrigation system. Background Art

[0002] The large terrain undulation results in significant differences in ground elevation within the irrigation area. This difference directly affects the flow state and pressure distribution of water in the irrigation pipe network. In lower areas, due to the gravitational force of water, the water pressure in the pipe network is relatively high. On the contrary, in higher areas, due to the elevation of the terrain, the water pressure gradually decreases, which may not meet the irrigation requirements and lead to restricted crop growth.

[0003] The large terrain undulation also makes the design of the irrigation pipe network complex. To ensure a stable water supply pressure throughout the irrigation area, designers need to reasonably set up water conservancy facilities such as pumping stations and water storage tanks according to the specific terrain conditions, and optimize the layout and pipe diameter selection of the pipe network. This not only requires rich professional knowledge and experience, but also a large amount of manpower, material resources and financial resources.

[0004] The large terrain undulation also brings certain difficulties to the operation and maintenance of the irrigation system. Due to the large pressure difference in the pipe network, it may be necessary to frequently adjust the working state of the pumping station and the opening degree of the valves in the pipe network to ensure the stability of the water supply pressure. At the same time, due to the complexity of the terrain, the inspection and maintenance of the irrigation pipe network become more difficult, and more advanced technical means and methods are required. Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a terrain-adaptive drip irrigation system and its method for dynamically adjusting the hydraulic pressure balance to solve the problem of large differences in the water supply pressure of the irrigation pipe network caused by large terrain undulation in the control area of some water-saving irrigation systems.

[0006] To solve the above problems, the present application provides a terrain-adaptive drip irrigation system, which includes:

[0007] A main pipe with at least one main valve, on which at least a pressure sensor before the main valve, a main valve, and a pressure sensor after the main valve are arranged along the water flow direction, and the main valve is connected to a main valve opening controller;

[0008] A number of branch pipes, which are arranged in parallel and connected to the main pipe; at least a pressure sensor before the branch valve, a branch valve, and a pressure sensor after the branch valve are arranged on the branch pipe along the water flow direction, and the branch valve is connected to a branch valve opening controller;

[0009] A control system and a host computer, the control system is electrically connected to the pressure sensor before the main valve, the pressure sensor after the main valve, the main valve opening controller, the pressure sensor before the branch valve, the pressure sensor after the branch valve, the branch valve opening controller, and the host computer.

[0010] The present application also provides a method for dynamically balancing the water pressure of a terrain-adaptive drip irrigation system. Using the above terrain-adaptive drip irrigation system, the method includes:

[0011] According to the irrigation unit area controlled by the branch pipe of the drip irrigation system A , the laying spacing of the drip irrigation capillary in the field D , the spacing of the emitters on the capillary d and the flow rate q , set the flow rate of the branch pipe required for the drip irrigation capillary controlled after the branch valve Q ;

[0012] According to the required flow rate of the drip irrigation branch pipe after the branch valve Q , set the flow rate of the branch pipe controlled after the branch valve to be Q bs ;

[0013] According to the set flow rate of the branch pipe after the branch valve Q bs , the pressure value of the pressure sensor before the branch valve P bb , set the pre-pressure value after the branch valve P bas ;

[0014] Every t time, obtain the pressure value monitored by the pressure sensor after the branch valve P ba ;

[0015] According to the obtained pressure value monitored by the pressure sensor after the branch valve P ba Calculate the difference between the pre-pressure value after the branch valve P bas and the pressure value monitored by the pressure sensor after the branch valve P ba e ba ;

[0016] According to the difference e ba Every t time, adjust the opening control signal of the branch valve opening controller once u ba （t）。

[0017] In order to clarify the required water volume of the branch pipe after the branch valveR and the laying spacing of the drip irrigation lateral pipes d， As an option of the present application, according to the irrigation unit area controlled by the drip irrigation lateral pipes A , the laying spacing of the field drip irrigation capillary pipes D , the emitter spacing of the capillary pipes d and the flow rate q , the required flow rate of the drip irrigation capillary pipes of the lateral pipe after setting the lateral pipe valve Q , the irrigation area of the lateral pipe A , the laying spacing of the drip irrigation capillary pipes D、 the emitter spacing of the capillary pipes d and the flow rate q branch pipe The relationship among them is:

[0018]

[0019] In order to further accurately control the required flow rate of the drip irrigation capillary pipes of the lateral pipe Q， As an improvement of the above solution of the present application, the required flow rate of the drip irrigation capillary pipes of the lateral pipe after the lateral pipe valve per unit time Q , the surplus coefficient α， The relationship with the lateral pipe after the flow control valve behind the lateral pipe valve Q bs is:

[0020]

[0021] In order to clarify the pre-pressure value behind the lateral pipe valve P bas ， As an option of the present application, the lateral pipe control flow rate behind the lateral pipe valve Q bs , the pressure value of the pressure sensor in front of the lateral pipe valve P bb , the pre-pressure value behind the lateral pipe valve P bas The relationship is:

[0022]

[0023] Among them,

[0024] Q bs is the set lateral pipe control flow rate value, with the unit of volume / time;

[0025] C is the actual flow rate under the unit differential pressure;

[0026] S is the cross-sectional area of the lateral pipe through which the fluid flows;

[0027] ρ is the density of the fluid.

[0028] To further improve the irrigation accuracy, the pre-pressure value after the branch pipe valve P bas and the pressure value monitored by the pressure sensor after the branch pipe valve P ba The difference e ba As an option of this application, the pre-pressure value after the branch pipe valve P bas and the pressure value monitored by the pressure sensor after the branch pipe valve P ba The difference e ba

[0029] e ba =P bas -p ba

[0030] Every t Adjust the opening control signal of the branch pipe valve opening controller once every time u ba (t) Is:

[0031]

[0032] Among them, K p 、K i 、K d Are the proportional, integral, and differential coefficients respectively, K p =K i +5 × K d , K i =5K d The K p Is 8 to 12 times the inner pipe diameter of the branch pipe;

[0033] u ba (t) Is the opening control signal of the branch pipe valve;

[0034] e ba (t) Is the actual error at the current moment;

[0035] is the integral of the error;

[0036] is the error rate of change.

[0037] Furthermore, according to the terrain, a plurality of branch pipes are provided, and the flow rate after the branch valve of each set branch pipe Q bs and the flow rate after the main and branch valve Q t The relationship is:

[0038] Q t ≥ ,

[0039] n represents the nth branch pipe.

[0040] In order to stabilize the pressure value monitored by the pressure sensor before the branch valve, as an improvement of the present application, it also includes setting the pre-pressure value before the branch valve to be P bbs ;

[0041] Every t time, obtain the pressure value monitored by the pressure sensor before the branch valve P bb；

[0042] According to the obtained pressure value monitored by the pressure sensor before the branch valve P bb , calculate the pre-pressure value before the branch valve P bbs and the pressure value monitored by the pressure sensor before the branch valve P bb difference e bb ;

[0043] According to the difference e bb Every t time, adjust the opening control signal of the main valve opening controller once ut(t):

[0044]

[0045] Among them, L p 、L i 、L d are the proportional, integral, and differential coefficients respectively L p =L i +5× L d , L = 5L d The L p is 8 to 12 times the inner pipe diameter of the branch pipe;

[0046] Among them: u bb (t) is the opening control signal of the branch pipe valve;

[0047] e bb (t) is the actual error at the current moment;

[0048] is the integral of the error;

[0049] is the error rate of change;

[0050] The pressure value monitored by the total valve rear pressure sensor P tb and the pressure value monitored by the branch pipe valve front pressure sensor P bb The relationship is:

[0051] P tb ≈

[0052] n represents the nth branch pipe.

[0053] The technical effect of this application is that:

[0054] The terrain-adaptive drip irrigation system provided by this application can adjust the flow rate of the branch pipes by setting a control system, a host computer, a pressure sensor monitored by a total valve front pressure sensor, a total valve rear pressure sensor, a total valve opening controller, a branch pipe valve front pressure sensor, a branch pipe valve rear pressure sensor, a branch pipe valve opening controller, etc. In this way, the terrain-adaptive drip irrigation system can perceive and adjust the water pressure in each area in real time, ensuring that the water supply pressure of the irrigation pipe network can maintain dynamic balance in the case of large terrain undulations, and improving the efficiency and effect of the water-saving irrigation system.

[0055] The water pressure dynamic balance adjustment method provided by this application sets the flow rate of the branch pipe according to the irrigation area and the attributes of the branch pipe, sets the preset pressure value after the branch pipe valve according to the flow rate, and adjusts the opening degree of the branch pipe valve according to the difference between the pressure value monitored by the pressure sensor after the branch pipe valve in real time and the preset pressure value after the branch pipe valve. It can automatically adjust the opening degree of the branch pipe valve, achieve the dynamic balance of water pressure during irrigation, help improve the irrigation efficiency and stability of the irrigation system in areas with undulating terrain, and reduce the waste of water resources at the same time. Description of the Drawings

[0056] Figure 1 A terrain-adaptive drip irrigation system provided by an embodiment of this application;

[0057] Figure 2 A structural block diagram of a terrain-adaptive drip irrigation system provided by an embodiment of this application;

[0058] Figure 3 A block diagram of a water pressure dynamic balance adjustment method provided by an embodiment of this application.

[0059] Description of the Reference Numerals:

[0060] 1. Main pipe; 11. Pressure sensor before the main valve; 12. Main valve; 13. Pressure sensor after the main valve; 14. Main valve opening controller;

[0061] 2. Branch pipe; 21. Pressure sensor before the branch pipe valve; 22. Branch pipe valve; 23. Pressure sensor after the branch pipe valve; 24. Branch pipe valve opening controller;

[0062] 3. Control system;

[0063] 4. Host computer. Detailed Embodiment

[0064] Hereinafter, embodiments of the technical solution of this application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0065] As Figure 1 schematically shows a terrain-adaptive drip irrigation system provided by an embodiment of this application. The system includes: a main pipe 1 with at least a main valve 12, and at least a pressure sensor 11 before the main valve, a main valve 12, and a pressure sensor 13 after the main valve are arranged along the water flow direction on the main pipe 1, and the main valve 12 is connected to a main valve opening controller 14;

[0066] A number of branch pipes 2, a number of said branch pipes 2 are arranged in parallel and connected to the main pipe 1; along the water flow direction on the branch pipe 2, at least a pressure sensor 21 before the branch pipe valve, a branch pipe valve 22, and a pressure sensor 23 after the branch pipe valve are provided, and the branch pipe valve 22 is connected to a branch pipe valve opening controller 24;

[0067] A control system 3 and a host computer 4, the control system 3 is electrically connected to the pressure sensor 11 before the main valve, the pressure sensor 13 after the main valve, the main valve opening controller 14, the pressure sensor 21 before the branch pipe valve, the pressure sensor 23 after the branch pipe valve, the branch pipe valve opening controller 24, and the host computer 4.

[0068] Such as Figure 1 , in an embodiment of an irrigation system provided in the present application, there is at least one main pipe 1 in the system, and a main valve 12 is provided on the main pipe 1 for controlling the opening and closing of the main pipe; a pressure sensor 11 before the main valve is installed in front of the main valve 12 for measuring the water pressure before the main valve; a pressure sensor 13 after the main valve is installed behind the main valve 12 for measuring the water pressure after the main valve, that is, the total water pressure before entering each branch pipe; the main valve opening controller 14 is connected to the main valve 12 and adjusts the opening of the main valve according to the instruction of the control system 3 to control the water flow rate and pressure in the main pipe.

[0069] A number of branch pipes 2 are arranged in parallel and connected to the main pipe 1 for delivering water to each irrigation area; a pressure sensor 21 before the branch pipe valve is installed in front of the branch pipe valve 22 on each branch pipe for measuring the water pressure before the branch pipe valve; a pressure sensor 23 after the branch pipe valve is installed behind the branch pipe valve 22 for measuring the water pressure after the branch pipe valve, that is, the water pressure before entering the irrigation area; the branch pipe valve opening controller 24 is connected to the branch pipe valve 22 and adjusts the opening of the branch pipe valve according to the instruction of the control system 3 to control the water flow rate and pressure in the branch pipe.

[0070] The control system 3 receives the data of each pressure sensor and calculates the opening adjustment instructions of the main valve and the branch pipe valve based on these data through an algorithm. Host computer 4: Used for remotely monitoring and controlling the entire drip irrigation system and communicating with the control system 3.

[0071] The process when the irrigation system works is as follows:

[0072] Input irrigation parameters: Input irrigation parameters through the host computer 4 and send the parameter information to the control system 3;

[0073] Data acquisition: The control system 3 real-time collects the water pressure data before the main valve, after the main valve, before each branch pipe valve, and after the branch pipe valve through each pressure sensor;

[0074] Data analysis: The control system 3 processes and analyzes the collected data to judge the water pressure difference and supply-demand relationship in each area;

[0075] Instruction Sending: Based on the data analysis results, the control system 3 sends adjustment instructions to the main valve opening controller 14 and each branch valve opening controller 24;

[0076] Opening Adjustment: The main valve opening controller 14 adjusts the opening of the main valve 12 according to the instruction to control the water flow rate and pressure in the main pipe; each branch valve opening controller 24 adjusts the opening of the corresponding branch valve 22 according to the instruction to control the water flow rate and pressure in each branch pipe;

[0077] Monitoring: The host computer 4 receives the data and status information sent by the control system 3 in real time for remote monitoring and operation.

[0078] In this way, the terrain-adaptive drip irrigation system can sense and adjust the water pressure in each area in real time, ensuring that the water supply pressure of the irrigation pipe network can maintain dynamic balance in the case of large terrain undulations, and improving the efficiency and effect of the water-saving irrigation system.

[0079] This application also provides a method for dynamically balancing the water pressure based on the above-mentioned terrain-adaptive drip irrigation system, and the method includes:

[0080] According to the irrigation unit area controlled by the branch pipe of the drip irrigation system A , the laying spacing of the field drip irrigation capillary D , the emitter spacing of the capillary d and the flow rate q , set the flow rate of the branch pipe required for the drip irrigation capillary controlled after the branch valve 22 Q ;

[0081] According to the flow rate required for the drip irrigation branch pipe after the branch valve 22 Q , set the flow rate of the branch pipe controlled after the branch valve to be Q bs ;

[0082] According to the set flow rate of the branch pipe after the branch valve Q bs , the pressure value of the pressure sensor before the branch valve P bb , set the pre-pressure value after the branch valve P bas ;

[0083] Every t time, obtain the pressure value monitored by the pressure sensor 23 after the branch valve P ba ;

[0084] According to the obtained pressure value monitored by the pressure sensor 23 after the branch valve P ba Calculate the pre-pressure value after the branch valve P basThe difference in the pressure value monitored by the pressure sensor 23 after the branch pipe valve P ba ; e ba ;

[0085] According to the difference e ba every t time, adjust the opening control signal of the branch pipe valve opening controller 24 u ba （t）。

[0086] Specifically, in the embodiment of the present application, the specific steps can be sorted out as follows:

[0087] S1. Parameter setting:

[0088] According to the irrigation unit area controlled by the branch pipe of the drip irrigation system A , the laying spacing of the drip irrigation laterals in the field D , the spacing between the emitters of the lateral d and the flow rate q , set the flow rate of the branch pipe required for the drip irrigation laterals controlled after the branch pipe valve 22 Q ; The flow rate of the branch pipe required for the drip irrigation laterals Q is usually determined based on factors such as crop type, growth stage, soil humidity, and climate conditions, as well as empirical values. According to the irrigation unit area controlled by the branch pipe of the drip irrigation system A , the laying spacing of the drip irrigation laterals in the field D , the spacing between the emitters of the lateral d and the flow rate q , the branch pipe sets the flow rate required for the drip irrigation laterals of the branch pipe after the branch pipe valve 22 Q , where the irrigation area of the branch pipe A , the laying spacing of the drip irrigation laterals D、 the spacing between the emitters of the lateral d and the flow rate q branch pipe The relationship before is:

[0089]

[0090] Irrigation area A , the laying spacing of the drip irrigation laterals in the field D、 the spacing between the emitters of the lateral d and the flow rate q The relationship between them reflects the relationship between the amount of water required in the unit area and the water conveyance capacity of the branch pipe.

[0091] In one option, the flow rate required for the drip irrigation laterals of the branch pipe after the branch pipe valve 22 per unit time Q , the surplus coefficient α， and the branch pipe after the control flow valve behind the branch pipe valve Qbs The relationship is as follows:

[0092]

[0093] Considering various losses and uncertainties that may occur in actual irrigation (such as terrain undulations, different soil water absorption rates, etc.), a safety factor α is set to ensure that the actual irrigation effect reaches or exceeds the expectation. Generally, the safety factor α can be set to 2 - 3;

[0094] S2. Setting the pre - pressure value after the branch pipe valve:

[0095] According to the set flow rate of the branch pipe after the branch pipe valve Q bs and the pressure value of the pressure sensor before the branch pipe valve P bb , the pre - pressure value after the branch pipe valve P bas is set;

[0096] Combined with the system characteristics (such as pipeline friction, terrain height difference, etc.), the pre - pressure value after the branch pipe valve is set through a mathematical model or empirical formula P bas . The pre - pressure value after the branch pipe valve P bas is to ensure that there is sufficient water pressure in the branch pipe to achieve the set flow rate Q bs .

[0097] In an embodiment, the controlled flow rate of the branch pipe after the branch pipe valve Q bs , the pressure value of the pressure sensor before the branch pipe valve P bb , and the pre - pressure value after the branch pipe valve P bas have the following relationship:

[0098]

[0099] Among them,

[0100] Q bs is the set controlled flow rate value after the branch pipe valve, with the unit of volume / time;

[0101] C is the actual flow rate under unit differential pressure;

[0102] S is the cross - sectional area of the branch pipe through which the fluid flows. Generally, for a circular - cross - section pipeline, the diameter can be selected as 16 mm or 20 mm;

[0103] ρ is the density of the fluid. For example, the density of water is 1 g / cm³.

[0104] S3. Post-valve pressure monitoring:

[0105] At intervals of t time (e.g., every few minutes), obtain the pressure value monitored by the post-branch-valve pressure sensor 23 through the post-branch-valve pressure sensor P ba , and the interval time can be set according to the system requirements.

[0106] S4. Calculation of the post-valve pressure difference:

[0107] Based on the obtained pressure value monitored by the post-branch-valve pressure sensor 23 P ba calculate the pre-pressure value after the branch valve P bas and the difference from the pressure value monitored by the post-branch-valve pressure sensor 23 P ba ; the difference e ba ; the difference e ba reflects the difference between the current pressure and the desired pressure

[0108] e ba =P bas -p ba

[0109] S5. Dynamic adjustment of the opening control signal of the branch valve

[0110] According to the difference e ba At intervals of t time, adjust the opening control signal of the branch valve opening controller 24 once u ba (t)。 If e ba is positive, it indicates that the current pressure is higher than the pre-pressure, and the opening of the branch valve should be reduced; if e ba is negative, it indicates that the current pressure is lower than the pre-pressure, and the opening of the branch valve should be increased. This process is dynamic to ensure that the pressure can be maintained within a stable range during irrigation.

[0111] In one embodiment, at intervals of t time, adjust the opening control signal of the branch valve opening controller 24 once u ba (t) is:

[0112]

[0113] Among them, K p 、K i 、K d are the proportional, integral, and differential coefficients respectively, K p =K i +5 × K d , K i =5K d The K p is 8 to 12 times the inner pipe diameter of the branch pipe;

[0114] u ba (t) is the opening control signal of the branch pipe valve;

[0115] e ba (t) is the actual error at the current moment;

[0116] is the integral of the error;

[0117] is the error change rate.

[0118] In addition, during the entire irrigation process, continuous monitoring and adjustment are required. Continuously monitor the pressure value monitored by the pressure sensor 23 behind the branch pipe valve P ba , and adjust the opening control signal of the branch pipe valve as needed u ba (t) . This can be achieved through an automated control system to ensure the efficient and stable operation of the irrigation system.

[0119] Recording and optimization are also required. Specifically, record the change situation of the pressure value monitored by the pressure sensor 23 behind the branch pipe valve during each irrigation process P ba , the adjustment records of the opening control signal of the branch pipe valve u ba (t) and other data. By analyzing these data, the irrigation method can be further optimized to improve irrigation efficiency and water resource utilization rate.

[0120] With this irrigation method, the terrain-adaptive drip irrigation system can automatically adjust the opening degree of the branch pipe valves according to the actual irrigation requirements and terrain conditions, achieving dynamic balance of water pressure during irrigation. This helps to improve the efficiency and stability of the irrigation system while reducing water resource waste.

[0121] Further, in some embodiments, according to the terrain, a plurality of branch pipes are provided, and the flow rate after the branch pipe valves of each set branch pipe Q bs and the flow rate after the sub-main valve Q t are related as:

[0122] Q t ≥ ,

[0123] where n represents the nth branch pipe.

[0124] To stabilize the pressure value monitored by the pressure sensor 21 in front of the branch pipe valve, in some embodiments, during dynamic pressure regulation, it further includes setting the pre-pressure value in front of the branch pipe valve to be P bbs ;

[0125] Every t time, obtain the pressure value monitored by the pressure sensor 21 in front of the branch pipe valve P bb ;

[0126] According to the obtained pressure value monitored by the pressure sensor 21 in front of the branch pipe valve P bb , calculate the difference between the pre-pressure value in front of the branch pipe valve P bbs and the pressure value monitored by the pressure sensor 21 in front of the branch pipe valve P bb ; e bb ;

[0127] According to the difference e bb Every t time, adjust the opening control signal of the main valve opening controller 14 once u t (t)：

[0128]

[0129] Among them, L p 、L i 、L dare the proportional, integral, and differential coefficients respectively L p =L i +5 × L d , L = 5L d the L p is 8 to 12 times the inner pipe diameter of the branch pipe;

[0130] u bb (t) is the opening control signal of the branch pipe valve;

[0131] e bb (t) is the actual error at the current moment;

[0132] is the integral of the error;

[0133] is the error rate of change;

[0134] the pressure value monitored by the main valve rear pressure sensor 13 P tb and the pressure value monitored by the branch pipe valve front pressure sensor 21 P bb has the relationship:

[0135] P tb ≈

[0136] n represents the nth branch pipe.

[0137] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0138] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears at various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting the water pressure dynamic balance of a terrain-adaptive drip irrigation system, characterized in that: A terrain-adaptive drip irrigation system is used, which includes: A main pipe (1) having at least one main valve (12), wherein at least a pressure sensor (11) before the main valve, a main valve (12), and a pressure sensor (13) after the main valve are arranged on the main pipe (1) along the water flow direction, and the main valve (12) is connected to a main valve opening controller (14); A plurality of branch pipes (2), wherein the plurality of branch pipes (2) are arranged in parallel and connected to the main pipe (1); at least a branch pipe valve front pressure sensor (21), a branch pipe valve (22), and a branch pipe valve rear pressure sensor (23) are arranged on the branch pipe (2) along the water flow direction, and the branch pipe valve (22) is connected to a branch pipe valve opening controller (24); A control system (3) and a host computer (4), wherein the control system (3) is electrically connected to the main valve front pressure sensor (11), the main valve rear pressure sensor (13), the main valve opening controller (14), the branch valve front pressure sensor (21), the branch valve rear pressure sensor (23), the branch valve opening controller (24), and the host computer (4); The method comprises: Irrigation unit area controlled by drip irrigation system branches A , field drip irrigation capillary laying spacing D , capillary emitter spacing d and flow q , set the branch valve (22) to control the flow rate of the branch required by the drip irrigation capillary Q， Branch pipe setting branch pipe valve (22) after the branch pipe drip irrigation capillary required flow Q , branch pipes where irrigation area A , Drip irrigation capillary laying spacing D、 Spacing of capillary emitters d and flow q The relationship between the branches is: According to the required flow rate of the drip irrigation branch pipe after the branch valve (22) Q , after setting the branch valve, the branch flow rate is controlled to Q bs ; Required flow rate of the branch pipe drip irrigation capillary pipe after the branch pipe valve (22) per unit time Q , the surplus coefficient α， Control flow after branch valve Q bs The relationship is: According to the set branch flow after the branch valve Q bs , Pressure value of the pressure sensor before the branch valve P bb , set the pre-pressure value after the branch valve P bas , the branch pipe after the branch valve controls the flow Q bs , Pressure value of the pressure sensor before the branch valve P bb , pre-pressure value after branch valve P bas The relationship is: in, Q bs It is the set control flow value after the branch valve, the unit is volume / time; C is the actual flow rate under unit differential pressure; S is the cross-sectional area of ​​the branch pipe through which the flow passes; ρ is the density of the fluid; Every t The pressure value monitored by the pressure sensor (23) after the branch valve is obtained at a certain time. P ba ; According to the pressure value monitored by the pressure sensor (23) after the branch valve P ba Calculate the pre-pressure value after the branch valve P bas The pressure value monitored by the pressure sensor (23) after the branch valve P ba The difference e ba， e ba =P bas -P ba According to the difference e ba Every t Time adjustment of the opening control signal of the primary branch valve opening controller (24) u ba （t）； in, K p 、K i 、K d are proportional, integral and differential coefficients respectively, K p =K i +5 × K d , K i =5K d Said K p 8~12 times the inner diameter of the branch pipe; u ba (t) It is the opening control signal of the branch valve; e ba (t) is the actual error at the current moment; is the integral of the error; Is the error The rate of change.

2. The method for adjusting the water pressure dynamic balance according to claim 1, characterized in that: According to the terrain, multiple branches are set up, and the flow rate after the branch valve of each branch is set. Q bs Flow after the total valve Q t The relationship is: Q t ≥ ， n represents the nth branch.

3. The method for adjusting the water pressure dynamic balance according to claim 1, characterized in that: It also includes setting the pre-pressure value before the branch valve P bbs ; Every t The pressure value monitored by the pressure sensor (21) before the branch valve is obtained at a certain time. P bb ； According to the pressure value monitored by the pressure sensor (21) before the branch valve P bb , calculate the pre-pressure value before the branch valve P bbs The pressure value monitored by the pressure sensor (21) before the branch valve P bb The difference e bb ; According to the difference e bb Every t Time adjustment of the opening control signal of the primary main valve opening controller (14) ut(t): in, L p 、L i 、L d are proportional, integral, and differential coefficients respectively L p =L i +5 × L d , L=5L d Said L p 8~12 times the inner diameter of the branch pipe; u bb (t) It is the opening control signal of the branch valve; e bb (t) is the actual error at the current moment; is the integral of the error; Is the error The rate of change of The pressure value monitored by the main valve rear pressure sensor (13) P tb The pressure value monitored by the pressure sensor (21) before the branch valve P bb The relationship is: P tb ≈ n represents the nth branch.

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