CN110939111A - Dam gate opening and closing control method - Google Patents
Dam gate opening and closing control method Download PDFInfo
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- CN110939111A CN110939111A CN201911305567.9A CN201911305567A CN110939111A CN 110939111 A CN110939111 A CN 110939111A CN 201911305567 A CN201911305567 A CN 201911305567A CN 110939111 A CN110939111 A CN 110939111A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/20—Movable barrages; Lock or dry-dock gates
- E02B7/40—Swinging or turning gates
- E02B7/42—Gates of segmental or sector-like shape with horizontal axis
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Abstract
The invention discloses a dam gate opening and closing control method, wherein a pair of oil cylinders are arranged on two sides of a gate, an automatic control system is used for controlling the telescopic motion of pistons of the oil cylinders, the automatic control system comprises a pair of opening sensors and a PLC (programmable logic controller), the PLC is stored with a control program compiled according to a mathematical model established according to the relative position relationship between the sensors and the gate, and the telescopic strokes of the pistons of the two oil cylinders are adjusted according to a preset program according to the opening value of the gate detected by the sensors, so that the opening difference value of the two sides of the gate is in an allowable range, and the gate is kept to stably run; the method for compiling the control program comprises the steps of dividing the total opening stroke of the gate into a plurality of lifting sections, manually lifting the gate in each lifting section, actually measuring the initial opening values of two sides of each section of end point of the gate and the coding values of two sensors, and obtaining the corresponding relation of any point of the section through a linear algorithm, so that the coding values of the sensors can correctly reflect the opening value of the gate, compiling the PLC control program, repeating the steps and compiling the control programs of all the lifting sections.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower, in particular to a dam gate opening and closing control method.
Background
In the overflow facilities of modern large hydropower stations, the double-oil-cylinder hydraulic opening and closing radial gate is widely applied due to large water sealing area and stable opening and closing, but has higher requirements on the opening degree detection device and the PLC control program. The control mode of the opening degree of the type gate is as follows: the sensors arranged on two sides of the gate respectively detect the opening degrees of the two sides of the gate and transmit the opening degrees to the PLC, the PLC calculates and compares the opening degree data of the two sides in real time, sends out a deviation rectifying instruction according to the set program logic and controls the oil cylinder on one side with larger opening degree of the gate to release pressure, so that the opening degree of the side gate is reduced, the height difference value of the two sides of the gate is controlled within a proper range, and the gate is kept to stably run. The premise of the process is that accurate and unique corresponding relation needs to be established between the opening detection values on the two sides of the gate and the actual opening values on the two sides of the gate. Taking a working door of a flood discharging tunnel of a deep stream ditch as an example, the gate adopts an auxiliary oil cylinder type magnetostrictive opening sensor, the magnetostrictive opening sensor in the auxiliary oil cylinder is driven to shorten and extend through the angle change of the oil cylinder when the gate is opened and closed, and the coded value data reflecting the opening change of the gate is obtained through the unique corresponding relation between the actual opening on the two sides of the gate and the length of the sensor. In design, a trigonometric function relation existing between the actual opening degree of the gate and the length of the sensor can be obtained by establishing a mathematical model, so that a PLC program is compiled according to the function relation, the function of converting the coded data of the opening degree sensor into the opening degree value of the gate is realized, and the deviation rectifying action of the gate in operation is controlled. The functional correspondence is shown in fig. 1.
However, in actual engineering operation, due to accumulated deviation, gate deformation and other reasons, the program algorithm written by the above function correspondence relationship often causes a large deviation between the detected value of the gate opening and the actual value. The difference value can be irregularly increased along with the deformation increase of each part after the long-term operation of the gate, and the reprogramming of the program through the measurement and correction of each fixed value has great difficulty.
Disclosure of Invention
In view of the above problems, the present invention provides a new control method without the disadvantages of the prior art, and the technical solution is:
a dam gate opening and closing control method is characterized in that a gate of a dam is an arc gate, a pair of oil cylinders are arranged on two sides of the gate and used as drivers for opening and closing the gate, an automatic control system controls pistons of the oil cylinders to move telescopically to drive the gate to be opened or closed, the automatic control system comprises a pair of opening sensors and a PLC (programmable logic controller), the opening sensors respectively detect opening values on two sides of the gate, the PLC is stored with a control program compiled according to a mathematical model established according to the relative position relation between the sensors and the oil cylinders, and the telescopic strokes of the pistons of the two oil cylinders are adjusted according to a preset program according to the opening values detected by the sensors, so that the opening difference values on two sides of the gate are within an allowable range, and the gate is kept to operate; the method is characterized in that the specific method for compiling the control program is that the total opening stroke of the gate is divided into a plurality of lifting sections, each lifting section adopts a manual gate lifting, the initial opening values of two sides of the end point of each section of the gate and the coding values of two sensors are actually measured, the corresponding relation of any point of the section is obtained through a linear algorithm, so that the coding values of the sensors can correctly reflect the opening value of the gate, the PLC control program is compiled, and the steps are repeated so as to complete the control program of all the lifting sections.
The control program writing method comprises the following specific steps:
(1) the observation personnel select the fixed-position level gauge, the operating personnel connect the PLC with the debugging equipment, and the maintenance personnel observe the working states of the gate water seal and other parts;
(2) an operator lifts the gate from a fully closed position to a fully opened position in a manual mode in a segmented mode, actual opening values and opening sensor coding values of the gates on two sides are recorded after lifting of each segment is finished, then the gate can fall to the fully closed position once, and if the gate is inclined in the door lifting and falling process, manual deviation rectification adjustment can be carried out;
(3) according to the recorded data, a programmer writes a PLC opening calculation and correction program;
(4) and the programmer introduces the programmed program into the PLC, and then operates the gate full-stroke test in an automatic operation mode to correct the data of the individual sections with poor states.
The sectional lifting gate is 0.4M per section.
The invention has the beneficial effects that:
the gate controlled by the method has stable and reliable operation, the pressure of the rod cavities on two sides is balanced, and the automatic operation success rate of the gate is greatly improved. The method takes approximately 2 days to calibrate a gate in an engineering application. The method is effectively implemented, has great safety value and social benefit for the future double-oil-cylinder hydraulic opening and closing of the radial gate, and has good popularization significance for the safe and stable operation of similar water conservancy gates.
Drawings
FIG. 1 is a diagram showing the relationship between the gate opening and the sensor length
FIG. 2 is a diagram showing the correspondence between the actual opening degree of the gate and the encoding value of the opening degree sensor
Fig. 3 is a schematic diagram of actually measured points on the correspondence curve.
Detailed Description
In order to solve the problems in the prior art, the inventor discovers that the opening degree of the radial gate of the double-cylinder hydraulic hoist can be calibrated by a method of forming a continuous straight-line segment fitting actual curve through segmented observation and calibration data through analysis and research, so that a control program is compiled, the measurement error of a sensor can be effectively overcome, the accumulated deviation is eliminated, the actual opening difference value of two sides of the gate is in an allowable range, and the stable operation of the gate is ensured.
The actual opening value of the gate is used as the Y axis, the coded value of the opening sensor is used as the X axis, and the relationship between the actual opening value and the coded value is simulated by mathematical software to be a positive correlation smooth curve with gradually reduced slope on the coordinate axis, as shown in fig. 2.
In the gate calibration process, the actual opening value of the gate at each position can be obtained through instrument measurement, the coded value of the opening sensor in the PLC at the corresponding position is read, and the data of each position is displayed in the corresponding relation curve of fig. 2 as point 1, point 2 and point 3 … …, so as to obtain fig. 3.
And (3) sequentially connecting points 1, 2 and 3 … … in the figure 3 end to end by using straight line segments to obtain the piecewise fitting straight line segment. After the gate opening value and the opening sensor code value of a certain point X-1 and a certain point X are known, the actual opening value H of any position on a line segment between the two points can be easily calculated through the slope, and the calculation formula is
Therefore, a sectional calculation program is compiled according to the data of the point positions, and the opening value of the gate is detected in real time.
The method adopts the principle of actually measuring, taking points, fitting in sections and then calculating the opening degree in a programming mode, and has wide applicability no matter what types of opening degree sensors are adopted on the two sides of the gate respectively, whether the sensors are installed at the same position or not and how complex an actual corresponding relation curve is. Although deviation exists between the segmentation straight line and the actual curve in theory, when the measuring point positions are enough and the interval is small enough, the deviation between the measuring point positions and the actual curve can be ignored, and the opening value calculated by the PLC can accurately reflect the actual opening value of the gate.
The specific process optimization method comprises the following steps:
a dam gate opening and closing control method is characterized in that a gate of a dam is an arc gate, a pair of oil cylinders are arranged on two sides of the gate and used as drivers for opening and closing the gate, an automatic control system controls pistons of the oil cylinders to move telescopically to drive the gate to be opened or closed, the automatic control system comprises a pair of opening sensors and a PLC (programmable logic controller), the opening sensors respectively detect opening values on two sides of the gate, the PLC is stored with a control program compiled according to a mathematical model established according to the relative position relation between the sensors and the oil cylinders, and the telescopic strokes of the pistons of the two oil cylinders are adjusted according to a preset program according to the opening values detected by the sensors, so that the opening difference values on two sides of the gate are within an allowable range, and the gate is kept to operate; the specific method for writing the control program comprises the following steps: dividing the total opening stroke of the gate into a plurality of lifting sections, manually lifting the gate in each lifting section, actually measuring the initial opening values of two sides of each section of end point of the gate and the coding values of two sensors, and obtaining the corresponding relation of any point of the section through a linear algorithm, so that the coding values of the sensors can correctly reflect the opening values of the gate, and compiling a PLC control program, and repeating the steps to complete the compiling of the control programs of all the lifting sections.
The control program writing method comprises the following specific steps:
(1) the observation personnel select the fixed-position level gauge, the operating personnel connect the PLC with the debugging equipment, and the maintenance personnel observe the working states of the gate water seal and other parts;
(2) an operator lifts the gate from a fully closed position to a fully opened position in a manual mode in a segmented mode, actual opening values and opening sensor coding values of the gates on two sides are recorded after lifting of each segment is finished, then the gate can fall to the fully closed position once, and if the gate is inclined in the door lifting and falling process, manual deviation rectification adjustment can be carried out;
(3) according to the recorded data, a programmer writes a PLC opening calculation and correction program;
(4) and the programmer introduces the programmed program into the PLC, and then operates the gate full-stroke test in an automatic operation mode to correct the data of the individual sections with poor states.
The sectional lifting gate is 0.4M per section.
The gate controlled by the method has stable and reliable operation, the pressure of the rod cavities on two sides is balanced, and the automatic operation success rate of the gate is greatly improved. The method takes approximately 2 days to calibrate a gate in an engineering application. The method is effectively implemented, has great safety value and social benefit for the future double-oil-cylinder hydraulic opening and closing of the radial gate, and has good popularization significance for the safe and stable operation of similar water conservancy gates.
Claims (3)
1. A dam gate opening and closing control method is characterized in that a gate of a dam is an arc gate, a pair of oil cylinders are arranged on two sides of the gate and used as drivers for opening and closing the gate, an automatic control system controls pistons of the oil cylinders to move telescopically to drive the gate to be opened or closed, the automatic control system comprises a pair of opening sensors and a PLC (programmable logic controller), the opening sensors respectively detect opening values on two sides of the gate, the PLC is stored with a control program compiled according to a mathematical model established according to the relative position relation between the sensors and the oil cylinders, and the telescopic strokes of the pistons of the two oil cylinders are adjusted according to a preset program according to the opening values detected by the sensors, so that the opening difference values on two sides of the gate are within an allowable range, and the gate is kept to operate; the method is characterized in that the specific method for writing the control program comprises the following steps: dividing the total opening stroke of the gate into a plurality of lifting sections, manually lifting the gate in each lifting section, actually measuring the initial opening values of two sides of each section of end point of the gate and the coding values of two sensors, and obtaining the corresponding relation of any point of the section through a linear algorithm, so that the coding values of the sensors can correctly reflect the opening values of the gate, and compiling a PLC control program, and repeating the steps to complete the compiling of the control programs of all the lifting sections.
2. The dam gate opening and closing control method according to claim 1, wherein the concrete steps of programming the control program are as follows:
(1) the observation personnel select a fixed-position level gauge, the operating personnel connect the PLC with the debugging equipment, and the maintenance personnel observe the working state of the water seal part of the gate;
(2) an operator lifts the gate from a fully closed position to a fully opened position in a manual mode in a segmented mode, actual opening values and opening sensor coding values of the gates on two sides are recorded after lifting of each segment is finished, then the gate can fall to the fully closed position once, and if the gate is inclined in the door lifting and falling process, manual deviation rectification adjustment is carried out;
(3) according to the recorded data, a programmer writes a PLC opening calculation and correction program;
(4) and the programmer introduces the programmed program into the PLC, and then operates the gate full-stroke test in an automatic operation mode to correct the data of the individual sections with poor states.
3. The dam gate opening and closing control method according to claim 2, wherein the sectional elevating gate is 0.4M per section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305567.9A CN110939111A (en) | 2019-12-18 | 2019-12-18 | Dam gate opening and closing control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305567.9A CN110939111A (en) | 2019-12-18 | 2019-12-18 | Dam gate opening and closing control method |
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| Publication Number | Publication Date |
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| CN110939111A true CN110939111A (en) | 2020-03-31 |
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| CN201911305567.9A Withdrawn CN110939111A (en) | 2019-12-18 | 2019-12-18 | Dam gate opening and closing control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102722134A (en) * | 2012-06-05 | 2012-10-10 | 昆明理工大学 | Gate opening and angle coded value curve fitting method |
| CN104279991A (en) * | 2014-10-13 | 2015-01-14 | 大唐碧口水力发电厂 | Opening degree measurement device and method of arc sluice gate of large and medium-sized reservoir |
| CN205620771U (en) * | 2016-03-06 | 2016-10-05 | 广州市宏大欣电子科技有限公司 | Radial gate control system |
| CN206726034U (en) * | 2017-05-27 | 2017-12-08 | 南京南瑞集团公司 | Integrated gate controller |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
-
2019
- 2019-12-18 CN CN201911305567.9A patent/CN110939111A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102722134A (en) * | 2012-06-05 | 2012-10-10 | 昆明理工大学 | Gate opening and angle coded value curve fitting method |
| CN104279991A (en) * | 2014-10-13 | 2015-01-14 | 大唐碧口水力发电厂 | Opening degree measurement device and method of arc sluice gate of large and medium-sized reservoir |
| CN205620771U (en) * | 2016-03-06 | 2016-10-05 | 广州市宏大欣电子科技有限公司 | Radial gate control system |
| CN206726034U (en) * | 2017-05-27 | 2017-12-08 | 南京南瑞集团公司 | Integrated gate controller |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
Non-Patent Citations (1)
| Title |
|---|
| 余光荣等: "《深溪沟水电站泄洪闸工作门纠偏控制程序优化》", 《人民长江》 * |
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Address after: No.7 Tianyun Road, high tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan 610000 Applicant after: Guoneng Daduhe maintenance and installation Co.,Ltd. Address before: No.7 Tianyun Road, high tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan 610000 Applicant before: GUODIAN DADUHE MAINTENANCE & INSTALLATION Co.,Ltd. |
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Application publication date: 20200331 |