Axial flow propeller unit operation water head acquisition and control method

Abstract

A kind of axial flow propeller unit operating water head acquisition and control method, with the downstream water level based on the unit behind the grille water level meter issued under operating water head system, based on computer monitoring system script compiler, increase multiple virtual calculation measuring points, computer unit operating water head, while feeding back water head deviation too large and water level abnormal situation.Rebased on the calculated value of unit operating water head, according to the computer monitoring system script compiler increases the virtual calculation measuring point of unit, automatically issues the operating water head of unit under the condition of issuing permission, for improving the safe and stable operation of unit.The raw value of unit automatic water head data and water level meter acquisition of the present application is sent to computer monitoring system in real time with second level.Improve the reliability of water head control of hydropower station monitoring system based on computer monitoring system, real-time alarm, real-time analysis, real-time processing.

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 turbine unit. Background Art

[0002] Currently, most hydropower stations use solar-powered radar water level gauges to measure water levels. These signals are transmitted via ultra-high frequency radio to a receiving antenna, then converted to digital signals via copper feeders, radios, and modems. These signals are connected to the master control station via a response protocol and are refreshed every five minutes. A water level fluctuation of less than M (meters) within 10 minutes is considered normal. If this fluctuation exceeds this value, the gauge water level data is considered abnormal, and the last normal data collected is used as the current water level data. The operating head of the unit speed governor is currently manually set by the operator on the monitoring system based on the unit head, and this is transmitted to the speed governor via the unit's LCU.

[0003] The above-mentioned water level 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 environmental factors, such as waves, fog, and floating objects. Moreover, since radar water level gauges rely on radar wave reflection, they must be placed vertically. Once they are 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 prone to abnormal water heads, which lead to 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 achieve high accuracy in water head acquisition, stable operation, and improved real-time data; and second, how to realize the automatic transmission function of water head. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a method for collecting and controlling the operating head of an axial-flow turbine. The method transmits the unit's automatic head data and the original values ​​collected by the water level gauge to a computer monitoring system in real time, within seconds. This computer monitoring system provides real-time alarms, analysis, and processing, thereby improving the reliability of the hydropower station monitoring system's head control.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for collecting and controlling the operating water head of an axial flow turbine unit comprises the following steps:

[0008] Step 1, the water regime data is sent to the data acquisition server by the water regime acquisition sensor, and the water regime data is accessed into the corresponding database after processing;

[0009] Step 2, the unit grid water level and downstream water level are obtained from the corresponding database by using the operation water head processing server, and the unit grid water level meter and downstream water level meter are added in the monitoring system related node machine configuration file, and the original value is collected,

[0010] Step 3, the original value is collected by the unit grid water level meter and downstream water level meter and is sent to the monitoring system in real time;

[0011] Step 4, based on the monitoring system script compiler, the "XX number machine operation water head" virtual calculation measuring point is added based on the unit grid water level meter and downstream water level sent by the operation water head processing server in real time, the measuring value is calculated through safety check and calculation formula, when the communication of the operation water head processing server is normal and the "XX number machine operation water head sending permission" measuring point is "1", the operation water head of each unit is used as "XXF governor sending water head" to be automatically sent;

[0012] Step 5, the monitoring system sends the "XX number machine operation water head" measuring value to the CPU of the unit LCU in real time, the CPU of the unit LCU sends the "XX number machine operation water head" measuring value to the CPU of the governor, and the governor sends the real-time water head value to the CPU of the LCU, and the CPU of the LCU sends the real-time water head value to the monitoring system, forming a closed loop monitoring.

[0013] Preferably, in step 1, the water regime acquisition sensor sends radar waves to the radar receiving device, and then sends the radar waves to the data acquisition server through the communication cable, and the water regime data is accessed into the corresponding database after processing.

[0014] Preferably, the unit grid water level and downstream water level collected by the operation water head processing server are debugged and checked with the unit grid water level and downstream water level received by the upper computer monitoring system.

[0015] Preferably, in step 2, the water level of each unit water level meter, the downstream side individual unit water level meter and the editing of these points are added in the analog quantity database.

[0016] Preferably, in step 4, in order to ensure the accuracy and reliability of the water head, the following safety check is performed before calculation:

[0017] ① The downstream water level is less than L1 or greater than L2, the water head is not calculated, and the downstream water level is abnormally alarmed;

[0018] ② The unit grid water level is less than L4 or greater than L5, the water head is not calculated, and the downstream water level is abnormally alarmed;

[0019] ③ If the difference between the downstream water level of 1F and the downstream water level of 2F exceeds L3, the head value will not be calculated and the downstream water level deviation alarm will be triggered;

[0020] 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 issued if the downstream water level deviation is too large;

[0021] 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 + 2F downstream water level) / 2.

[0022] Preferably, the “Operating head of unit XX” measuring point is added to the “head” measuring point input source in the database output library.

[0023] Preferably, in step 4, a virtual point is created for each machine in the database switch database as a mark for allowing the use of the operating head; 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 allowed" measurement point is set to "1", the operating head of each unit is used as the XXF speed governor sent head, otherwise the manual head sent by the AGC is used as the speed governor of the unit sent head.

[0024] Preferably, the process of automatically issuing the unit head is as follows:

[0025] (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 current water head value back to the CPU of the LCU and then back to the monitoring system. The whole process is carried out in real time.

[0026] (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, the operating water head is updated. If the change is less than L9 but greater than L10, the governor will not accept it and will alarm.

[0027] (3) The monitoring system is coordinated with the operating water head 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 the sensor is abnormal.

[0028] (4) After the monitoring system and the operating head system are debugged and no abnormalities are found, the compiled database is saved and the database of each host is updated.

[0029] An axial flow propeller unit operating water head collection and control system adopts the axial flow propeller unit operating water head collection and control method.

[0030] The present invention can achieve the following beneficial effects:

[0031] 1. Automatic head data from the unit and the original values ​​collected by the water level gauge are sent to the computer monitoring system in real time within seconds. This computer monitoring system provides real-time alarms, analysis, and processing, improving the reliability of the hydropower station monitoring system's head control.

[0032] 2. It enables 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

[0033] The present invention will be further described below with reference to the accompanying drawings and examples:

[0034] Figure 1 It is a data transmission link diagram of the present invention;

[0035] Figure 2 This is a flow chart for calculating the operating head of the unit of the present invention;

[0036] Figure 3 This is a flow chart for automatically issuing the water head of the unit of the present invention. DETAILED DESCRIPTION

[0037] The preferred solution is Figures 1 to 3 As shown, a method for collecting and controlling the operating head of an axial flow turbine unit comprises the following steps:

[0038] (1) The water condition data is collected by the radar wave sensor and sent to the radar receiving device, 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 values ​​of the unit's post-grid water level meter and the downstream water level meter are added to the configuration file of the relevant node machine of the monitoring system. The original values ​​of the unit's post-grid water level meter and the downstream water level meter are sent to the monitoring system in real time from the running head processing server.

[0039] (2) Based on the real-time post-grid water level gauge and downstream water level of the unit sent by the operating head system, a virtual calculation measurement point of "unit XX 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 "unit XX operating head sending permission" measurement point is set to "1", the operating head of each unit is used as the head sent by the XXF speed regulator and automatically sent.

[0040] (3) The monitoring system sends the measured value of "unit XX running 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 running water head" to the CPU of the speed regulator through RS485 serial 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.

[0041] Example 1:

[0042] 1. All water condition data collection sensors transmit data via radar waves to the radar receiver, and then to the data collection server via a communication cable. The water condition data is processed and then entered into the corresponding database. After the water head processing server obtains the corresponding data from the corresponding database, it sends the required data to the power station monitoring system via optical fiber or other media. All water condition data collection sensors transmit data via radar waves to the radar receiver, and then to the data collection server via a communication cable. The water condition data is processed and then entered into the corresponding database. (For example Figure 1 shown).

[0043] 2. After the running head processing server obtains the corresponding data from the corresponding database, the original values ​​of the unit's post-grid water level meter and downstream water level meter are added to the configuration file of the relevant node machine of the monitoring system. The original values ​​of the unit's post-grid water level meter and downstream water level meter are sent from the running head processing server to the monitoring system in real time.

[0044] 3. Run the water level after the unit grid and the downstream water level collected by the head processing server to conduct joint adjustment and verification of the head data with the host computer.

[0045] 4. Add the water level of each unit’s water level gauge, the water level of individual units’ water level gauges on the downstream side (1F and 7F) and edit these points in the analog database.

[0046] Add "Operating head of unit XX" to the object quantity of each unit in the database, such as Figure 2 The flowchart was edited with the corresponding script. To ensure the accuracy and reliability of the water head, the following safety checks were performed before the calculation:

[0047] ① If the downstream water level is less than L1 or greater than L2, the head will not be calculated and the downstream water level abnormality alarm will be activated;

[0048] ② If the water level after 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;

[0049] 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 alarm will be triggered;

[0050] 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 issued if the downstream water level deviation is too large;

[0051] 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 all calculated by the difference between the water level behind the gate and f1, where f1=(1F downstream water level + 2F downstream water level) / 2.

[0052] Add the "Operating Head" measurement point to the "Head" measurement point input source in the database's output data library. A unit water level fluctuation less than L8 is considered normal. If it exceeds this value, the water level data is considered abnormal, and the last normal data collected is used as the current water level data. The measured value information is shown in Table 1.

[0053] Table 1 Measurement information definition table

[0054]

[0055] 5. Automatic water head distribution function of the unit:

[0056] In the database switch quantity database, each machine creates a virtual point (XX machine running water head is allowed to be issued) as the running water head is allowed to be issued. Figure 3 Edit the water head input source script in the flowchart. When the operating water head system communication is normal and the "XX unit operating water head transmission permission" measurement 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.

[0057] The monitoring system sends the "head" measurement point value in the database analog 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 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 back to the monitoring system. The entire process is carried out in real time.

[0058] 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, the operating water head is updated. If the change is less than L9 but exceeds L10, the speed governor will not accept it and will alarm.

[0059] Perform joint debugging with the running water head system to observe whether there is any abnormality in communication, whether the water level collected by the running water head system has a large deviation or the sensor is abnormal.

[0060] After the joint debugging with the running head system is completed without any abnormality, save the compiled database and update the database of each host.

[0061] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for collecting and controlling the operating head of an axial flow turbine unit, characterized in that The following steps are involved: Step 1: Use water condition data collection sensors to send water condition data to the data collection server, and the water condition data is processed and then accessed into the corresponding database; Step 2: After obtaining the unit's post-grid water level and downstream water level from the corresponding database using the running water head processing server, add the unit's post-grid water level gauge and downstream water level gauge to the configuration file of the relevant node machine of the monitoring system, and collect the original values; Step 3: Use the water level gauge after the unit and the downstream water level gauge to collect the original value and send it to the monitoring system in real time; Step 4: Based on the unit's post-grid water level and downstream water level sent in real time by the operating head processing server, a virtual calculation measurement point "XX unit operating head" is added using the monitoring system script compiler. The measured value is calculated through safety verification and calculation formulas. When the operating head processing server 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 governor sending head" for automatic sending; Step 5: The monitoring system sends the measured value of "unit XX operating water head" to the unit's LCU CPU in real time. The LCU CPU sends the measured value of "unit XX operating water head" to the governor CPU. At the same time, the governor sends the real-time water head value back to the LCU CPU, which then sends it back to the monitoring system, forming a closed-loop monitoring system. Run the water head processing server to collect the unit's post-gate water level and downstream water level and the host computer monitoring system to conduct joint adjustment and verification of the water head data; 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 current water head value back to the CPU of the LCU and then back 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, the operating water head is updated. If the change is less than L9 or exceeds L10, the governor will not accept it and will alarm. L9 represents the lower limit of the water head change difference, and L10 represents the upper limit of the water head change difference. (3) The monitoring system is coordinated with the operating water head system to observe whether there is any abnormal communication, large deviation in the water level collected by the operating water head system, or abnormal sensor; (4) After the monitoring system and the operating head system are debugged and no abnormalities are found, the compiled database is saved and the database of each host is updated.

2. The method for collecting and controlling the operating water head of an axial-flow turbine according to claim 1, characterized in that: In step 1, the water condition data is collected by the sensor and sent to the radar receiving device via radar waves, and then sent to the data collection server via a communication cable. The water condition data is processed and then 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, characterized in that: In step 2, the water level gauge of each unit behind the trash rack and the water level gauge of individual units on the downstream side are added to the analog database and these points are edited.

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 4, 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 head will not be calculated and the downstream water level abnormality alarm will be activated; ② If the water level after 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 2F 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 L6 or greater than L7, the head value will not be calculated and an alarm will be issued if the downstream water level deviation is too large; L1 represents the lower limit of the downstream water level, L2 represents the upper limit of the downstream water level, L3 represents the downstream water level difference, L4 represents the lower limit of the water level behind the gate, L5 represents the upper limit of the water level behind the gate, L6 represents the lower limit of the difference between the water level behind the gate and the downstream water level, and L7 represents the upper limit of the difference between the water level behind the gate and the downstream water level; 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 + 2F downstream water level) / 2; nF represents the unit number, and n is a natural integer.

5. The method for collecting and controlling the operating water head of an axial-flow turbine according to claim 1, characterized in that: Add the "Operating Head of Unit XX" measuring point to the "Head" measuring point input source in the database output library.

6. The method for collecting and controlling the operating water head of an axial-flow turbine according to claim 1, characterized in that: In step 4, a virtual point is created for each unit in the database switch database as a flag for allowing the use of the operating head. The head input source script is edited in the database object database of each unit. When the operating head system communication is normal and the "XX unit operating head allowance" measurement point is set to "1", the operating head of each unit is used as the head issued by the XXF speed governor. Otherwise, the manual head issued by the AGC is used as the head issued by the speed governor of the unit.

7. A water head acquisition and control system for an axial flow turbine unit, characterized by: A method for collecting and controlling the operating water head of an axial flow turbine unit according to any one of claims 1 to 6 is adopted.

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