Axial-flow propeller unit operation water head collection and control method

Abstract

The invention relates to an axial flow propeller unit operation water head acquisition and control method, which is based on a unit trash rack rear water level and a downstream water level issued by an operation water head acquisition system, based on a computer monitoring system script compiler, a plurality of virtual calculation measuring points are added, a unit operation water head is calculated, and the conditions of overlarge water head deviation and water level abnormity are fed back at the same time. On the basis of the unit operation water head calculation value, unit virtual calculation measuring points are increased according to a computer monitoring system script compiler, and a unit operation water head is automatically issued under the condition of issuing permission so as to improve safe and stable operation of the unit. Automatic water head data of the unit and an original value collected by the water level gauge are sent to a computer monitoring system in real time in seconds. Based on a computer monitoring system, real-time alarm, real-time analysis and real-time processing are realized. And the reliability of the hydropower station monitoring system on water head control is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of computer monitoring systems for hydropower stations, and in particular relates to a method for collecting and controlling the operating water head of an axial flow impeller unit. Background Art

[0002] At present, most hydropower stations use radar water level gauges powered by solar cells to measure water levels. The water level is transmitted to the receiving antenna through UHF radio, and then converted into digital signals through copper shaft feeder, radio station, and modem. The signal is connected to the control main station through the response protocol and refreshed every 5 minutes. The water level change amplitude within 10 minutes is less than M (meters) as the normal change amplitude of the water level. If it exceeds this change amplitude, the water level data of the water level gauge is considered abnormal, and the normal data collected last time is used as the water level data at this time; the operating head of the unit speed governor is currently manually set by the operating personnel on the monitoring system according to the unit head, and sent to the speed governor through the unit LCU.

[0003] The above-mentioned water condition measurement device uses a radar wave sensor to measure the water level. Radar water level gauges are mainly used to measure water levels in waveless environments such as reservoirs. They are greatly affected by weather and environment, such as water waves, fog, floating objects, etc., and because radar water level gauges rely on radar wave reflection, they must be placed vertically. Once disturbed by factors such as wind and vibration, they will produce large fluctuations and may not be able to measure the water level. The above-mentioned water level measurement device has many faults and defects caused by fluctuations in measurement data, and it is easy to have abnormal water head, resulting in fluctuations in the output of the entire plant. At the same time, the control method of manually setting the water head by the operating personnel has poor real-time performance. If the main station sends too many types of water heads, the operating personnel are prone to misoperation, resulting in excessive impact on important adjustment processes such as the unit blade opening calculation and power regulation, affecting the safe and stable operation of the hydropower station units.

[0004] In summary, the technical problems to be solved by the present invention are: first, how to make the water head acquisition high in accuracy, stable in operation, and improve the real-time nature of the data; and second, how to realize the automatic sending function of the water head. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for collecting and controlling the water head of an axial flow turbine unit. The automatic water head data of the unit and the original value collected by the water level meter are sent to a computer monitoring system in real time at the second level. Based on the computer monitoring system, real-time alarm, real-time analysis and real-time processing are performed. The reliability of the water head control of the hydropower station monitoring system is improved.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for collecting and controlling the operating water head of an axial flow turbine unit, comprising the following steps: Step 1: Use water regime acquisition sensors to send water regime data to the data acquisition server. After being processed, the water regime data is connected to the corresponding database. Step 2: Use the operating head processing server to obtain the water level behind the unit's trash rack and the downstream water level from the corresponding database. Then, in the configuration file of the relevant node machines in the monitoring system, add water level gauges for the water level behind the unit's trash rack and the downstream water level, and collect the original values. Step 3: Use the unit water level gauge to collect the original value and send it to the monitoring system in real time. Step 4: Based on the water level behind the unit's trash rack and the downstream water level that are sent by the operating head processing server in real time, add a virtual calculation measuring point of "XX unit operating head" based on the monitoring system script compiler. Calculate the measured value through safety verification and calculation formulas. When the communication of the operating head processing server is normal and the measuring point of "XX unit operating head sending permission" is set to "1", use the operating head of each unit as "XXF governor sending head" and send it automatically. Step 5: The monitoring system sends the measured value of "XX unit operating head" to the CPU of the unit LCU in real time. The CPU of the unit LCU sends the measured value of "XX unit operating head" to the CPU of the governor. At the same time, the governor sends the real-time water head value back to the CPU of the LCU, and the CPU of the LCU sends it back to the monitoring system to form a closed-loop monitoring. Preferably, in Step 1, the water regime acquisition sensor sends radar waves to the radar receiving device, and then sends them to the data acquisition server through a communication cable. After being processed, the water regime data is connected to the corresponding database.

[0007] Preferably, the water level behind the unit's trash rack and the downstream water level collected by the operating head processing server are jointly adjusted and verified with the water head data of the water level behind the unit's trash rack and the downstream water level received by the upper computer monitoring system.

[0008] Preferably, in Step 2, add the water level of each water level gauge behind the trash rack and the water level of the water level gauges of individual downstream units in the analog quantity database, and edit these points; the individual units are nF, where n represents a natural integer.

[0009] Preferably, in Step 4, add "XX unit operating head" to the object quantities of each unit in the database, and then perform corresponding script editing: Judgment condition 1: L1 < 1F downstream water level < L2; and L1 < nF downstream water level < L2; Judgment condition 2: 丨1F downstream water level - nF downstream water level丨 < L3; Judgment condition 3: L4 < 1F water level behind the trash rack < L5; and L6 < 1F water level behind the trash rack - 1F downstream water level < L7; Judgment condition 4: L4 < 2F water level behind the trash rack < L5; and L6 < 2F water level behind the trash rack - 2F downstream water level < L7; Judgment condition five: L4 < water level behind the 3F gate < L5; and L6 < water level behind the 3F gate - downstream water level of 3F < L7; Judgment condition six: L4 < water level behind the 4F gate < L5; and L6 < water level behind the 4F gate - downstream water level of 4F < L7; Judgment condition seven: L4 < water level behind the 5F gate < L5; and L6 < water level behind the 5F gate - downstream water level of 5F < L7; …… Judgment condition m: L4 < water level behind the nF gate < L5; and L6 < water level behind the nF gate - downstream water level of nF < L7; m = n + 2; When judgment condition one is satisfied, enter judgment condition two; when judgment condition one is not satisfied, give an alarm of "abnormal downstream water level". When judgment condition two is satisfied, enter judgment condition three; when judgment condition two is not satisfied, give an alarm of "abnormal downstream water level". When judgment condition three is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition three is satisfied and the operating head of 1F = water level behind the 1F gate - downstream water level of 1F, no alarm occurs. When judgment condition four is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition four is satisfied and the operating head of 2F = water level behind the 2F gate - downstream water level of 2F, no alarm occurs. When judgment condition five is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition five is satisfied and the operating head of 3F = water level behind the 3F gate - f1, no alarm occurs; where f1 = (downstream water level of 1F + downstream water level of nF) / 2. When judgment condition six is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition six is satisfied and the operating head of 4F = water level behind the 4F gate - f1, no alarm occurs. When judgment condition seven is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition three is satisfied and the operating head of 5F = water level behind the 5F gate - f1, no alarm occurs. …… When judgment condition m is not satisfied, give an alarm of "excessive deviation of downstream water head"; when judgment condition m is satisfied and the operating head of nF = water level behind the nF gate - downstream water level of 1F, no alarm occurs. Preferably, in step 4, in order to ensure the accuracy and reliability of the water head, the following safety checks are carried out before calculation: ① If the downstream water level is less than L1 or greater than L2, the water head is not calculated, and an alarm of abnormal downstream water level is given. ② If the water level behind the unit gate is less than L4 or greater than L5, the water head is not calculated, and an alarm of excessive deviation of downstream water level is given. ③ If the difference between the downstream water level of 1F and the downstream water level of nF exceeds L3, the head value will not be calculated, and the downstream water level deviation alarm will be triggered; ④ If the calculated unit head value is less than Ln-1 or greater than Ln, the head value will not be calculated, and an alarm will be triggered if the downstream water level deviation is too large; The operating heads of 1F and 2F are calculated by the difference between the water level behind the gate and the downstream water level. The operating heads of 3F, 4F, 5F, 6F, …, nF are all calculated by the difference between the water level behind the gate and f1, where f1=(1F downstream water level + nF downstream water level) / 2.

[0010] Preferably, the "Operating head of unit XX" measuring point is added to the "head" measuring point input source in the database model output library; the unit water level variation amplitude less than Ln+1 is taken as the normal variation amplitude of the water level. If it exceeds this variation amplitude, the water level data is considered abnormal, and the normal data collected last time is used as the water level data at this time.

[0011] Preferably, in step 5, a virtual point is created for each machine in the database switch quantity database as a mark for allowing the use of the operating head to be sent; the head input source script is edited in the database object database of each unit, and when the operating head system communication is normal and the "XX unit operating head sending permission" measurement point is set to "1", the operating head of each unit is used as the XXF speed governor sending head, otherwise the manual head sent by the AGC is used as the speed governor sending head of the unit.

[0012] Preferably, the process of automatically sending the unit water head is as follows: (1) The monitoring system sends the measured value of the "water head" measurement point in the database output library to the CPU of the unit LCU through the STEP7 protocol. The CPU of the unit LCU sends the measured value of the "water head" measurement point to the CPU of the speed regulator through the LS485 serial port communication. At the same time, the speed regulator sends the water head value back to the CPU of the LCU and then to the monitoring system. The whole process is carried out in real time. (2) To prevent the governor from operating frequently, the governor compares the water head received with the current operating water head each time. When the difference is greater than L9 and less than or equal to L10 meters, the operating water head is updated. If the change is less than L9 and more than L10 meters, the governor will not accept it and alarm. (3) The monitoring system is coordinated with the operating water head collection system to observe whether there is any communication abnormality, whether the water level collected by the operating water head system has a large deviation or whether the sensor is abnormal.

[0013] (4) After the monitoring system and the running water head acquisition system are debugged and no abnormalities are found, the compiled database is saved and the database of each host is updated.

[0014] 10. An axial flow impeller unit operating water head collection and control system, characterized in that: an axial flow impeller unit operating water head collection and control method according to any one of claims 1-9 is adopted.

[0015] The present invention can achieve the following beneficial effects: 1. The unit's automatic water head data and the original value collected by the water level meter are sent to the computer monitoring system in real time within seconds. Based on the computer monitoring system, real-time alarm, real-time analysis and real-time processing are carried out. The reliability of the water head control of the hydropower station monitoring system is improved.

[0016] 2. Encourage power station operators to accurately control the water head, better control important adjustment processes such as blade opening calculation and power regulation, improve monitoring efficiency and reduce monitoring pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a data transmission link diagram of the present invention; Figure 2 This is a flow chart for calculating the operating water head of the unit of the present invention; Figure 3 This is a flow chart for automatically sending water head of the unit of the present invention. DETAILED DESCRIPTION

[0018] The preferred solution is Figures 1 to 3 As shown, a method for collecting and controlling the operating water head of an axial flow turbine unit comprises the following steps: (1) The water condition data is collected by the radar sensor and sent to the radar receiving device through the radar wave, and then sent to the data collection server through the communication cable. The water condition data is processed and connected to the corresponding database. After the running head processing server obtains the corresponding data from the corresponding database, the original value of the water level after the unit grid and the downstream water level meter is added to the configuration file of the relevant node machine of the monitoring system. The original value of the unit water level meter is sent from the running head processing server to the monitoring system in real time.

[0019] (2) Based on the water level behind the trash rack and the downstream water level sent in real time by the operating head collection system, a virtual calculation point of "XX unit operating head" is added based on the computer monitoring system script compiler. The measured value is calculated through safety verification and calculation formula. When the operating head system communication is normal and the "XX unit operating head transmission permission" measurement point is set to "1", the operating head of each unit is used as the XXF speed governor to automatically transmit the downstream head.

[0020] (3) The monitoring system sends the measured value of "unit XX operating water head" to the CPU of the unit LCU in real time through the STEP7 protocol. The CPU of the unit LCU sends the measured value of "unit XX operating water head" to the CPU of the speed regulator through RS485 serial port communication. At the same time, the speed regulator sends the real-time water head value back to the CPU of the LCU, and the CPU of the LCU sends it back to the monitoring system, forming a closed-loop monitoring.

[0021] Embodiment 1: 1. All water condition collection sensors send data to the radar receiving device through radar waves, and then send it to the data collection server through communication cables. The water condition data is processed and connected to the corresponding database. After the water head processing server obtains the corresponding data from the corresponding database, the required data is sent to the power station monitoring system through optical fiber and other media. All water condition collection sensors send data to the radar receiving device through radar waves, and then send it to the data collection server through communication cables. The water condition data is processed and connected to the corresponding database. (such as Figure 1 as shown).

[0022] 2. After the running head processing server obtains the corresponding data from the corresponding database, the original values ​​collected by the unit's post-grid water level and the downstream water level meter are added to the configuration file of the relevant node machine of the monitoring system. The original values ​​collected by the unit's water level meter are sent from the running head processing server to the monitoring system in real time.

[0023] 3. Run the water level processing server to collect the water level behind the unit and the downstream water level, and conduct joint adjustment and verification of the water head data with the host computer.

[0024] 4. Add the water level of each water level gauge behind the trash rack, the water level of the water level gauges of individual units on the downstream side (1F and 7F) and edit these points in the analog database.

[0025] Add "XX unit operating head" to the object quantity of each unit in the database, such as Figure 2 The flowchart is edited with the corresponding script. In order to ensure the accuracy and reliability of the water head, the following safety checks are performed before calculation: ① If the downstream water level is less than L1 or greater than L2, the water head will not be calculated and the abnormal downstream water level alarm will be activated; ② If the water level behind the unit is less than L4 or greater than L5, the water head will not be calculated and the downstream water level deviation will be too large to alarm; ③ If the difference between the downstream water level of 1F and the downstream water level of 7F exceeds L3, the head value will not be calculated, and the downstream water level deviation will be too large to alarm; ④ If the calculated unit head value is less than L6 or greater than L7, the head value will not be calculated, and an alarm will be triggered if the downstream water level deviation is too large; The operating heads of 1F and 2F are calculated by the difference between the water level behind the gate and the downstream water level. The operating heads of 3F, 4F, 5F, 6F and 7F are calculated by the difference between the water level behind the gate and f1, where f1=(1F downstream water level + 7F downstream water level) / 2.

[0026] Add the "Operation head of unit XX" measurement point to the "head" measurement point input source in the database output library. The unit water level fluctuation amplitude is less than L8 as the normal change amplitude of the water level. If it exceeds this change amplitude, the water level data is considered abnormal, and the normal data collected last time is used as the water level data at this time. The measurement information is shown in Table 1.

[0027] Table 1 Measurement information definition table Measured value Definition (m) Downstream water level limit L1 Downstream water level high limit L2 Downstream water level difference L3 Low limit of water level behind the gate L4 High limit of water level behind the gate L5 The lower limit of the difference between the water level behind the gate and the downstream water level L6 The upper limit of the difference between the water level behind the gate and the downstream water level L7 Unit water level amplitude L8 Head change difference lower limit L9 Head change difference upper limit L10 5. Automatic water head distribution function of the unit: In the database switch quantity database, each machine creates a virtual point (XX machine running water head is allowed to be sent down) as the mark for using running water head to send down permission. Figure 3 The flow chart is used to edit the script of the water head input source. When the operating water head system communication is normal and the "No. XX unit operating water head transmission permission" measuring point is set to "1", the operating water head of each unit is used as the water head transmitted by the XXF speed governor. Otherwise, the manual water head transmitted by the AGC is used as the water head transmitted by the speed governor of the unit.

[0028] The monitoring system sends the "head" measurement point value in the database output library to the CPU of the unit LCU through the STEP7 protocol. The CPU of the unit LCU sends the "head" measurement point value to the CPU of the speed regulator through the LS485 serial port communication. At the same time, the speed regulator sends the current head value back to the CPU of the LCU and then to the monitoring system. The whole process is carried out in real time.

[0029] To prevent the speed governor from operating frequently, the speed governor compares the received water head with the current operating water head each time. When the difference is greater than L9 and less than or equal to L10 meters, the operating water head is updated. If the change is less than L9 but greater than L10, the speed governor will not accept it and will alarm.

[0030] Conduct joint debugging with the running water head collection system to observe whether there is any communication abnormality, whether the water level collected by the running water head system has a large deviation or the sensor is abnormal.

[0031] After the joint debugging with the running water head acquisition system is completed without any abnormality, the compiled database is saved and the database of each host is updated.

[0032] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for collecting and controlling the operating water head of an axial flow turbine unit, characterized in that It includes the following steps: Step 1: Use the water regime acquisition sensor to send the water regime data to the data acquisition server. After the water regime data is processed, it is connected to the corresponding database; Step 2: Use the operating head processing server to obtain the water level behind the unit's trash rack and the downstream water level from the corresponding database. In the configuration file of the relevant node machine of the monitoring system, add the water level gauges behind the unit's trash rack and the downstream water level gauge, and collect the original values; Step 3: Use the unit water level gauge to collect the original values and send them to the monitoring system in real time; Step 4: Based on the water level behind the unit's trash rack and the downstream water level issued by the operating head processing server in real time, based on the monitoring system script compiler, add the virtual calculation measuring point of "XX unit operating head". Through safety verification and calculation formula, calculate the measured value. When the communication of the operating head processing server is normal and the measuring point of "XX unit operating head issuance permission" is set to "1", use the operating head of each unit as the "XXF governor issuance head" and issue it automatically; Step 5: The monitoring system issues the measured value of "XX unit operating head" to the CPU of the unit LCU in real time. The CPU of the unit LCU issues the measured value of "XX unit operating head" to the CPU of the governor. At the same time, the governor sends the real-time water head value back to the CPU of the LCU, and the CPU of the LCU sends it back to the monitoring system to form a closed-loop monitoring; 2. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: In Step 1, the water regime acquisition sensor sends radar waves to the radar receiving device, and then sends them to the data acquisition server through a communication cable. After the water regime data is processed, it is connected to the corresponding database; 3. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: The water level behind the unit's trash rack and the downstream water level collected by the operating head processing server are jointly adjusted and checked with the water level behind the unit's trash rack and the downstream water level received by the upper computer monitoring system; 4. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: In Step 2, add the water level of each water level gauge behind the trash rack and the water level of the water level gauge of individual units on the downstream side in the analog database, and edit these points; the individual units are nF, where n represents a natural integer; 5. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: In Step 4, add "XX unit operating head" to the object quantity of each unit in the database, and then perform corresponding script editing: Judgment condition 1: L1 < 1F downstream water level < L2; and L1 < nF downstream water level < L2; Judgment condition 2: |1F downstream water level - nF downstream water level| < L3; Judgment condition 3: L4 < 1F water level behind the trash rack < L5; and L6 < 1F water level behind the trash rack - 1F downstream water level < L7; Judgment condition 4: L4 < 2F water level behind the trash rack < L5; and L6 < 2F water level behind the trash rack - 2F downstream water level < L7; Judgment condition 5: L4 < 3F water level behind the trash rack < L5; and L6 < 3F water level behind the trash rack - 3F downstream water level < L7; Judgment condition 6: L4 < 4F water level behind the trash rack < L5; and L6 < 4F water level behind the trash rack - 4F downstream water level < L7; Judgment condition 7: L4 < 5F water level behind the trash rack < L5; and L6 < 5F water level behind the trash rack - 5F downstream water level < L7; …… Judgment condition m: L4 < nF water level behind the trash rack < L5; and L6 < nF water level behind the trash rack - nF downstream water level < L7; m = n + 2; When judgment condition 1 is met, judgment condition 2 is entered; when judgment condition 1 is not met, an "abnormal downstream water level" alarm is issued; When judgment condition 2 is met, judgment condition 3 is entered; when judgment condition 2 is not met, an "abnormal downstream water level" alarm is issued; When the judgment condition three is not met, the "downstream water head deviation is too large" alarm is issued; when the judgment condition three is met and 1F operating hand = 1F post-gate water level - 1F downstream water level, no alarm is issued; When judgment condition 4 is not met, the "downstream water head deviation is too large" alarm is issued; when judgment condition 4 is met and 2F operating head = 2F post-gate water level - 2F downstream water level, no alarm is issued; When judgment condition 5 is not met, the "downstream water head deviation is too large" alarm is issued. When judgment condition 5 is met and 3F operating head = 3F post-gate water level - f1, no alarm is issued; where f1 = (1F downstream water level + nF downstream water level) / 2; When judgment condition six is ​​not met, the "downstream water head deviation is too large" alarm is issued. When judgment condition six is ​​met and 4F operating hand = 4F post-gate water level - f1, no alarm is issued; When judgment condition seven is not met, the "downstream water head deviation is too large" alarm is issued. When judgment condition three is met and 5F operating hand = 5F post-gate water level - f1, no alarm is issued; …… When the judgment condition m is not met, the "downstream head deviation is too large" alarm is issued. When the judgment condition m is met and nF operating head = nF post-gate water level - 1F downstream water level, no alarm occurs.

6. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 5 is characterized in that: In step 4, in order to ensure the accuracy and reliability of the water head, the following safety checks were performed before calculation: ① If the downstream water level is less than L1 or greater than L2, the water head will not be calculated and the abnormal downstream water level alarm will be activated; ② If the water level behind the unit is less than L4 or greater than L5, the water head will not be calculated and an alarm will be triggered if the downstream water level deviation is too large; ③ If the difference between the downstream water level of 1F and the downstream water level of nF exceeds L3, the head value will not be calculated, and the downstream water level deviation alarm will be triggered; ④ If the calculated unit head value is less than Ln-1 or greater than Ln, the head value will not be calculated, and an alarm will be triggered if the downstream water level deviation is too large; The operating heads of 1F and 2F are calculated by the difference between the water level behind the gate and the downstream water level. The operating heads of 3F, 4F, 5F, 6F, …, nF are all calculated by the difference between the water level behind the gate and f1, where f1=(1F downstream water level + nF downstream water level) / 2.

7. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: Add the "Operating Head of Unit XX" measuring point to the "Head" measuring point input source in the database output library; the unit water level fluctuation amplitude less than Ln+1 is regarded as the normal variation amplitude of the water level. If it exceeds this variation amplitude, the water level data is considered abnormal, and the normal data collected last time is used as the water level data at this time.

8. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1 is characterized in that: In step 5, a virtual point is created for each machine in the database switch quantity database as a mark for allowing the use of the operating water head; the water head input source script is edited in the database object database of each unit. When the operating water head system communication is normal and the "XX unit operating water head allowed" measurement point is set to "1", the operating water head of each unit is used as the XXF governor's issued water head; otherwise, the manual water head issued by the AGC is used as the governor's issued water head for the unit.

9. The method for collecting and controlling the operating water head of an axial flow turbine according to claim 1, characterized in that: The process of automatic water head distribution of the unit is as follows: (1) The monitoring system sends the measured value of the "water head" measurement point in the database output library to the CPU of the unit LCU through the STEP7 protocol. The CPU of the unit LCU sends the measured value of the "water head" measurement point to the CPU of the speed regulator through the LS485 serial port communication. At the same time, the speed regulator sends the water head value back to the CPU of the LCU and then to the monitoring system. The whole process is carried out in real time. (2) To prevent the governor from operating frequently, the governor compares the water head received with the current operating water head each time. When the difference is greater than L9 and less than or equal to L10 meters, the operating water head is updated. If the change is less than L9 and more than L10 meters, the governor will not accept it and alarm. (3) The monitoring system is coordinated with the operating water head collection system to observe whether there is any abnormal communication, large deviation of the water level collected by the operating water head system, or sensor abnormality; (4) After the monitoring system and the running water head acquisition system are debugged and no abnormalities are found, the compiled database is saved and the database of each host is updated.

10. An axial flow impeller unit operating water head collection and control system, characterized in that: A method for collecting and controlling the operating water head of an axial flow impeller unit according to any one of claims 1 to 9 is adopted.

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