CN-122004111-A - Water head loss mapping-based intelligent drip irrigation wheel irrigation area pressure control system and method

CN122004111ACN 122004111 ACN122004111 ACN 122004111ACN-122004111-A

Abstract

The invention discloses a drip irrigation wheel irrigation area pressure intelligent control system and method based on head loss mapping, which belong to the technical field of agricultural irrigation and comprise a pump station, a partition valve, a controller, a head pressure sensor and a pressure loss database; the pressure loss database stores pressure loss and compensation parameters of each wheel irrigation area for the controller to read the wheel irrigation area and pressure demand data, the partition valve provides address signals of the wheel irrigation areas for the controller, the controller inquires corresponding pressure demand data from the database according to the address signals, calculates and sends a head target pressure set value to the pump station, the pump station receives instructions and stabilizes outlet pressure within a set range through frequency conversion adjustment, and the head pressure sensor monitors the pressure in real time and feeds the pressure back to the controller. The technical scheme of the invention can automatically identify working conditions and calculate parameters and complete closed-loop adjustment, improves continuity and reliability while reducing labor intensity, and ensures that the output pressure of the water pump is accurately matched with actual demands by adjusting the rotation speed of the pump station, thereby reducing energy consumption.

Inventors

LIANG BIN
WANG MENG
XU LIANFA
XU BAOGANG
HE SHIPENG
LI HONGJIAN

Assignees

潍坊汇金海物联网技术有限公司
知禾尚农(山东)农业科技服务有限公司
青岛农业大学

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (6)

1. The drip irrigation wheel irrigation area pressure intelligent control system based on head loss mapping is characterized by comprising a pump station, a partition valve, a controller, a head pressure sensor and a pressure loss database; the pressure loss database is used for storing pipeline along-path head loss values, local head loss values and elevation loss parameters corresponding to each wheel irrigation area and reading 'wheel irrigation area-pressure requirement' data when the controller switches the wheel irrigation areas; The controller is used for identifying the currently opened wheel irrigation area, inquiring a total head loss value H i corresponding to the wheel irrigation area from the wheel irrigation area-pressure requirement data, generating and issuing an adjusting instruction of a head target pressure set value P set,i to the pump station according to a preset tail end working pressure P end ; the partition valve is used for controlling the opening and closing states of the wheel irrigation areas and providing address signals of the wheel irrigation areas for the controller; the pump station is used for receiving the regulating instruction of the controller, and providing header pressure for the opened wheel irrigation area through the frequency converter, so that the header pressure of the pump station is kept within the set range of the header target pressure set value P set,i ; The header pressure sensor is used for monitoring the header pressure of the pump station outlet in real time and feeding back a header pressure signal to the controller.
2. The control system of claim 1, wherein: The total head loss value H i includes a head loss value HW i and an elevation loss value Δh i ; The head loss value HW i includes an along-path head loss value HFi and a local head loss value HJ i .
3. The control system according to claim 2, wherein the pressure loss database calculates the head loss of the pipeline along the path from the main pipe and the branch pipe sections corresponding to each wheel irrigation area i according to Hazen-Williams formula The calculation formula is as follows: Wherein: the water head loss along the way of the pipe section is expressed as meter water column; l is the length of the pipe section, and the unit is meter; Q is the volume flow through the pipe section in cubic meters per second; d, the inner diameter of the pipeline is in meters; the Hazen-Williams roughness coefficient is a dimensionless constant; The along-path head loss value HF i is calculated as the sum of the along-path head losses h f of each pipeline, namely: the head loss value HW i is: HW i =HF i +HJ i wherein HJ i is a local head loss value, HJ i ≈（10±0.5）%HF i ; the elevation loss value Δh i is: ΔH i =Hi end -Hi start Where Hi end is the elevation of the end point and Hi start is the elevation of the start point; the total head loss value H i is: H i =HW i +ΔH i 。
4. The control system of claim 3, wherein the control system, The header target pressure set point P set,i is: P set,i =P end +H i +M Wherein P end is the preset end working pressure, H i is the total head loss value of the wheel irrigation area i, and M is the safety margin.
5. The method for realizing the drip irrigation wheel irrigation area pressure intelligent control system based on head loss mapping as claimed in claims 1-4, which is characterized by comprising the following steps: s1, a controller reads a solenoid valve control signal of a partition valve, identifies an irrigation area i to be irrigated, and enters a step S2; s2, inquiring a total head loss value H i corresponding to the wheel irrigation area i from a pressure loss database by the controller according to the number of the partition valve, and entering a step S3; S3, the controller calculates a head target pressure set value P set,i of the wheel irrigation area i according to a preset tail end working pressure P end and a total head loss value H i , the controller generates a pressure regulating instruction and sends the pressure regulating instruction to a pump station, and the step S4 is entered; S4, the pump station receives a pressure regulating instruction of the controller, and the output pressure of the pump is regulated through the frequency converter, so that the head pressure value of the pump station approaches to the head target pressure set value P set,i , stable irrigation operation is carried out, and the step S5 is carried out; S5, in the irrigation process, a head pressure sensor monitors the head pressure of an outlet of the pump station in real time, and feeds back a head pressure signal to the controller, so that the step S6 is performed; s6, the controller compares the absolute differences delta N and delta Q of the pump station operating frequency N (t) and the main pipeline flow Q (t) which are synchronously acquired in real time and the system stable operating parameter N stable,i 、Q stable,i with the pump station operating frequency threshold deviation delta N threshold and the main pipeline flow threshold deviation delta Q threshold to judge whether the normal working condition is met; If Δq is less than or equal to Δq threshold and Δn is less than or equal to Δn threshold , judging that the normal working condition is met, and entering step S7; If Δq > Δq threshold , or Δn > Δn threshold , determining that an abnormal working condition exists, and entering step S8; S7, the controller is in a self-learning mode, corrects the total head loss value H i , and updates the corrected H i to a pressure loss database, after irrigation of the irrigation area i is finished, switching the irrigation area, opening a valve of the next area, closing the valve of the irrigation area i, and returning to the step S1; And S8, entering a protection mode, stopping learning and correcting the along-path head loss value H i , alarming and controlling to stop irrigation.
6. The control method according to claim 5, characterized in that, In the step S7, when the system is in the self-learning mode, under the condition of maintaining the head target pressure P set,i , when the actual main pipe flow Q (t) is higher than the main pipe flow Q stable,i in the steady operation, the actual total head loss value of the system is smaller than the total head loss value H i recorded in the pressure loss database, the total head loss value H i is reduced, and when the actual main pipe flow Q (t) is lower than the main pipe flow Q stable,i in the steady operation, the total head loss value H i is increased.

Description

Water head loss mapping-based intelligent drip irrigation wheel irrigation area pressure control system and method Technical Field The invention belongs to the technical field of agricultural irrigation, and particularly relates to an intelligent drip irrigation wheel irrigation area pressure control system and method based on head loss mapping. Background At present, in a large-area drip irrigation system, the distances between different irrigation areas and pump rooms are far, and the problem that the heights of the different irrigation areas are different in hilly and mountain areas also exists, so that the water outlet pressure difference of each irrigation area is large. The pressure decay is severe in the irrigated areas farther (or higher) from the pump house, while the nearer (or lower) irrigated areas may be subject to pressure redundancy, a pressure gradient profile that makes the head pressures required for each irrigated area inconsistent. The traditional solution is to install a plurality of pressure sensors at key nodes for real-time monitoring, but the hardware deployment and maintenance cost is high, the sensors are easily interfered by environmental factors and have insufficient long-term stability, or the fixed initial pressure setting is adopted, namely, a reference pressure value is uniformly set, but the actual requirements of different wheel irrigation areas cannot be dynamically adapted, so that the near-end energy consumption is wasted, the irrigation of a far-end area is uneven, and the overall water resource utilization efficiency is low. In addition, the fixed pressure mode may cause frequent start-up and shut-down of the water pump, further increasing equipment loss and operating costs. No solution to the above problems has been found yet. Disclosure of Invention The invention aims at solving the technical problem that the head pressure required by each wheel irrigation area is inconsistent due to the difference of the distance (height) between the wheel irrigation area and a pump house, provides a drip irrigation wheel irrigation area pressure intelligent control system and a drip irrigation wheel irrigation area pressure intelligent control method based on head loss mapping, the pressure demand mapping data from the wheel irrigation areas to the head are obtained by calculating the head loss and the height difference of the pipeline along the distance of each wheel irrigation area, the pump station pressure is automatically regulated when irrigation is switched, stable pressure supply can be realized under the condition that a plurality of pressure sensors are not required to be installed, irrigation uniformity is improved, and energy consumption is reduced. In order to solve the technical problems, the invention adopts the following technical scheme: The drip irrigation wheel irrigation area pressure intelligent control system based on head loss mapping comprises a pump station, a partition valve, a controller, a head pressure sensor and a pressure loss database; the pressure loss database is used for storing pipeline along-path head loss values, local head loss values and elevation loss parameters corresponding to each wheel irrigation area and reading 'wheel irrigation area-pressure requirement' data when the controller switches the wheel irrigation areas; The controller is used for identifying the currently opened wheel irrigation area, inquiring a total head loss value H i corresponding to the wheel irrigation area from the wheel irrigation area-pressure requirement data, generating and issuing an adjusting instruction of a head target pressure set value P set,i to the pump station according to a preset tail end working pressure P end; the partition valve is used for controlling the opening and closing states of the wheel irrigation areas and providing address signals of the wheel irrigation areas for the controller; the pump station is used for receiving the regulating instruction of the controller, and providing header pressure for the opened wheel irrigation area through the frequency converter, so that the header pressure of the pump station is kept within the set range of the header target pressure set value P set,i; The header pressure sensor is used for monitoring the header pressure of the pump station outlet in real time and feeding back a header pressure signal to the controller. Preferably, the total head loss value H i includes a head loss value HW i and an elevation loss value Δh i; the head loss value HW i includes an along-path head loss value HF i and a local head loss value HJ i. Preferably, the pressure loss database calculates the head loss of the pipeline along the path segment by segment according to the Hazen-Williams formula to calculate the main pipe and the branch pipe sections corresponding to each wheel irrigation area iThe calculation formula is as follows: Wherein: the water head loss along the way of the pipe section is expressed as meter wate