Opening control method for flood discharge gate of hydropower station with pressurized water seal

Abstract

The invention discloses a gate opening control method for a flood discharge gate of a hydropower station with a pressurized water seal, and belongs to the field of hydropower station equipment control. A pressure detection device, a hydraulic driving system, a plurality of oil pump motors and a plurality of electromagnetic valves are included. Judging a preset control mode in the operation instruction; if the mode is the maintenance mode, the pressurizing water seal pressure relief and flood discharge gate opening process is manually controlled, the gate opening degree is preset, and after the flood discharge gate reaches the preset opening degree, the pressure of an oil pump motor is manually removed, and the machine is stopped; if not, the pressurizing water seal pressure relief and flood discharge gate opening process is automatically controlled, and whether the gate is opened or not is determined according to whether the flood discharge gate meets the preset gate opening condition or not; and resetting the operation instruction, removing the oil pressure of the oil pump motor, and stopping. According to the invention, the process can be interrupted in time when a fault occurs, the operation and maintenance efficiency is improved, and economic loss caused by equipment shutdown is reduced.

Description

Technical Field

[0001] This invention belongs to the field of hydropower station equipment control, and specifically relates to a method for controlling the opening of a flood discharge gate in a hydropower station with a pressurized water seal. Background Technology

[0002] Large hydropower stations typically install telescopic pressurized water seals on their floodgates. These seals utilize back pressure to ensure that the seal head adapts well to the deformation of the gate, remaining firmly pressed against the gate panel to achieve effective water sealing.

[0003] When a hydropower station needs to release floodwaters, the pressurized water seal must be depressurized before the release. The gate can only be opened after the water seal pressure has dropped to a safe level. After the floodwater release is complete and the gate is closed, the water seal is repressurized to restore its water-stopping effect. However, ordinary water-stopping and gate-opening procedures often malfunction due to incomplete water seal depressurization or abnormal linkage between water seal depressurization and gate opening. For example, in some scenarios, before the floodgate is opened, the water in the water seal pressurization chamber is not completely discharged, the pressure has not dropped to the preset safe value, or a stable negative pressure has not been formed during the vacuuming process, and the gate is opened directly. At this time, the expanded water seal has not fully contracted, which will cause friction and scratching with the gate slot, easily causing the pressurized water seal to be torn or damaged, affecting the water-stopping effect of the floodgate, increasing the operation and maintenance costs of the hydropower station, and also posing safety hazards.

[0004] To improve the water seal depressurization problem, existing technologies have developed specialized depressurization control methods for water seals. These methods involve closing the pressurization valve, opening the vent valve and drain valve to drain water, and then starting a vacuum pump to create a vacuum, ensuring the water seal depressurizes to the required level before opening the gate. However, in current large hydropower stations, the hydraulic drive system controlling the opening and closing of the floodgate and the depressurization system controlling the pressurization and depressurization of the water seal often operate independently. The control process is fully automated, lacking intermediate intervention points. This makes it impossible to interrupt the process promptly in case of a fault, hindering timely troubleshooting. This not only causes significant inconvenience to the maintenance and repair of hydropower stations but also renders the floodgate and pressurized water seal unusable, affecting reservoir capacity regulation and further increasing economic losses for the hydropower station. Therefore, there is an urgent need for a hydropower station floodgate opening control method that can solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a method for controlling the opening of a floodgate in a hydropower station with a pressurized water seal. This method aims to solve the problem that the current fully automated control process for depressurization and floodgate opening makes it difficult to promptly interrupt and repair in case of malfunctions, leading to inconvenience in operation and maintenance and resulting in economic losses. To achieve the above objective, this invention provides the following technical solution: A method for controlling the opening of a flood discharge gate in a hydropower station with a pressurized water seal includes a pressure detection device for detecting the real-time pressure of the pressurized water seal, a hydraulic drive system for driving the opening and closing of the flood discharge gate, several oil pump motors, and several solenoid valves corresponding to each oil pump motor. The method comprises the following steps: S0: Receives operating instructions when the floodgates are fully closed; S1: Determine the preset control mode in the operation command; if it is maintenance mode, execute step A; if it is not maintenance mode, execute step B. Step A includes: A1: Manually depressurize the pressurized water seal and determine whether the depressurization of the pressurized water seal is complete; A2: After the pressurized water seal is depressurized, manually control each oil pump motor to load and build up pressure in the hydraulic drive system; and then instruct the loaded hydraulic drive system to control the opening of the flood discharge gate; A3: Preset gate opening; once the floodgate reaches the preset opening, manually release the oil pressure from the oil pump motor and stop its operation. Step B includes: B1: Preset pressure relief protection time and automatically pressurize the water seal for pressure relief; once the pressure relief protection time is up, it is determined that the pressure relief is complete; then, the hydraulic drive system is pressurized using the motors of each oil pump; B2: Preset gate opening conditions; determine whether the gate opening conditions are met; if the gate opening conditions are met, proceed to step B3; if the gate opening conditions are not met, proceed directly to step B4. B3: Instruct the loaded hydraulic drive system to control the floodgate to open to the fully open state; B4: Run instruction reset; B5: Remove the oil pressure from the oil pump motor and stop its operation.

[0006] Further, step A1 specifically includes: A11: Determine whether the pressure detection device installed at the bottom of the pressurized water seal is operating normally. If it is operating normally, proceed to step A12; if it is not operating normally, proceed to step A13. A12: Manually control the pressurized water seal to release pressure; preset the first safe pressure value P1 of the pressure detection device; determine whether the pressure at the bottom of the pressurized water seal is less than the first safe pressure value P1; if it is less than P1, then the pressure release is complete; A13: Skip the pressure value judgment of the pressure detection device and manually perform the pressurization and depressurization operation of the water seal until the pressurization and depressurization of the water seal is completed.

[0007] Furthermore, the first safety pressure value P1 is between -0.005MPa and 0.001MPa.

[0008] Further, step A2 specifically includes: A21: After the pressurized water seal has been depressurized, manually start each oil pump motor in sequence using the operation button or touch screen; A22: Manually open the solenoid valves corresponding to the oil pump motor one by one, so that the oil pump motor draws oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

[0009] Furthermore, step B also includes the following steps: B0: Determine whether the preset control mode in the operation command is the local mode; if it is the local mode, then instruct the local control cabinet in the hydropower station to take over the control and automatically trigger step B1; if it is not the local mode, then automatically enter the remote control mode and actively trigger step B1 through the operator in the remote background.

[0010] Furthermore, in step B1, the process of using each oil pump motor to load and build pressure in the hydraulic drive system specifically involves: B11: Preset the starting sequence and interval of each oil pump motor, and automatically start each oil pump motor at different times; B12: Delayed loading controls the solenoid valves of each oil pump motor, causing the oil pump motor to draw oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

[0011] Further, in step B2, the door opening condition judgment process specifically involves: setting a second safety pressure value P2 for the pressure detection device, and determining whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if it is less than P2, the door opening condition is met; if it is greater than or equal to P2, the door opening condition is not met.

[0012] Furthermore, the second safety pressure value P2 is between -0.005MPa and 0.001MPa.

[0013] Furthermore, in step B2, if the door opening conditions are not met, the door opening situation is determined to be abnormal, and an alarm signal is output to the outside.

[0014] Furthermore, in step B3, the pressure detection device continuously detects whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if the pressure is greater than P2 for more than 5 seconds, it is determined that the door opening is abnormal, and the process jumps to step B4 and outputs an alarm signal.

[0015] The beneficial effects of this invention are: 1. This invention ensures the safety of floodgate opening by setting a pressure detection judgment node for the pressurized water seal during the gate opening process, effectively avoiding water seal damage and gate jamming caused by forced opening, and ensuring equipment operation reliability; and by setting a maintenance mode, it can check the fault points of components such as pressure detection equipment, oil pump motor, and solenoid valves one by one, which can accurately locate the fault, shorten maintenance time, and reduce the economic losses caused by equipment downtime to hydropower stations. Attached Figure Description Figure 1 This is a partial flow of the door opening control method provided by the present invention. Figure 1 This includes step A; Figure 2 This is a partial flow of the door opening control method provided by the present invention. Figure 2 This includes step B; Detailed Implementation In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0016] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0017] In the description of this invention, "a plurality of" means two or more.

[0018] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0019] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0020] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0022] Example 1: See attached Figures 1-2 A method for controlling the opening of a flood discharge gate in a hydropower station with a pressurized water seal includes a pressure detection device for detecting the real-time pressure of the pressurized water seal, a hydraulic drive system for driving the opening and closing of the flood discharge gate, several oil pump motors, and several solenoid valves corresponding to each oil pump motor. The method specifically includes the following steps: S0: Receives operating instructions when the floodgates are fully closed; S1: Determine the preset control mode in the operation command; if it is maintenance mode, execute step A; if it is not maintenance mode, execute step B. Step A includes: A1: Manually depressurize the pressurized water seal and determine whether the depressurization of the pressurized water seal is complete; A2: After the pressurized water seal is depressurized, manually control each oil pump motor to load and build up pressure in the hydraulic drive system; and then instruct the loaded hydraulic drive system to control the opening of the flood discharge gate; A3: Preset gate opening; once the floodgate reaches the preset opening, manually release the oil pressure from the oil pump motor and stop its operation. Step B includes: B1: Preset pressure relief protection time and automatically pressurize the water seal for pressure relief; once the pressure relief protection time is up, it is determined that the pressure relief is complete, and the hydraulic drive system is pressurized by the motors of each oil pump; B2: Preset gate opening conditions; determine whether the gate opening conditions are met; if the gate opening conditions are met, proceed to step B3; if the gate opening conditions are not met, proceed directly to step B4. B3: Instruct the loaded hydraulic drive system to control the floodgate to open to the fully open state; B4: Run instruction reset; B5: Remove the oil pressure from the oil pump motor and stop its operation.

[0023] As described above, this invention, when the floodgate is fully closed, can receive operating commands to trigger the control process of depressurization and gate opening, specifically including two control processes: maintenance and normal operation. In maintenance mode, the operating command is preset to maintenance mode. In maintenance mode, the entire process of depressurizing the pressurized water seal and opening the floodgate can be simulated, and operators can manually perform step-by-step operations, facilitating gradual troubleshooting of each stage, accurately locating fault points in components such as the oil pump motor and solenoid valve, accelerating fault diagnosis and maintenance progress, shortening repair time, and reducing economic losses to the hydropower station due to equipment downtime. In normal operation mode, the pressurized water seal is first automatically depressurized, and a preset depressurization protection time ensures that the depressurization is basically completed. The specific depressurization time can be adaptively adjusted according to the specific conditions of each hydropower station. Then, oil is supplied to the hydraulic drive system to ensure that it can control the opening of the floodgate. However, before actually opening the floodgate, it is necessary to determine whether the current conditions for safe opening are actually met according to preset opening conditions. If this condition is met, the gate can be opened to the full open position for flood discharge. If this condition is not met, it indicates a problem with the previous depressurization steps. In this case, the gate opening step should be skipped and the unloading and pump shutdown process should be initiated directly to avoid damage to the pressurized water seal or gate jamming caused by forced gate opening, thus ensuring the reliability of equipment operation.

[0024] Example 2: See attached Figures 1-2 Based on Embodiment 1, step A1 specifically includes: A11: Determine whether the pressure detection device installed at the bottom of the pressurized water seal is operating normally. If it is operating normally, proceed to step A12; if it is not operating normally, proceed to step A13. A12: Manually control the pressurized water seal to release pressure; preset the first safe pressure value P1 of the pressure detection device; determine whether the pressure at the bottom of the pressurized water seal is less than the first safe pressure value P1; if it is less than P1, then the pressure release is complete; A13: Skip the pressure value judgment of the pressure detection device and manually perform the pressurization and depressurization operation of the water seal until the pressurization and depressurization of the water seal is completed.

[0025] The first safety pressure value P1 is between -0.005MPa and 0.001MPa.

[0026] Step A2 specifically involves: A21: After the pressurized water seal has been depressurized, manually start each oil pump motor in sequence using the operation button or touch screen; A22: Manually open the solenoid valves corresponding to the oil pump motor one by one, so that the oil pump motor draws oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

[0027] As described above, the pressure detection device is located at the bottom of the pressurized water seal, monitoring its pressure value in real time. In step A1, if abnormal data is detected by the pressure detection device, the pressure judgment step can be skipped, allowing the operator to directly take over the local control system and manually intervene to continue depressurizing the water seal. This prevents the depressurization process from being blocked due to a faulty detection device, and allows for centralized on-site repair of the faulty detection device after depressurization, ensuring that subsequent troubleshooting focuses on the actual problem. The first safety pressure value P1 can be set between -0.005MPa and 0.001MPa, depending on the detection requirements.

[0028] In step A2, the oil pump motor and solenoid valves are manually controlled step by step to simulate the flood discharge process. The oil pump motor delivers oil to the hydraulic drive system, while the solenoid valves control the oil flow of the hydraulic drive system by gaining and losing power, thus enabling the hydraulic drive system to open the flood discharge gate. During this process, the operator can manually verify the starting performance of each oil pump motor and test the opening and closing of each solenoid valve. If an abnormality occurs in any step, the location of the faulty component can be directly identified, facilitating repair and significantly improving troubleshooting efficiency.

[0029] Example 3: See attached Figures 1-2 Based on Embodiment 2, step B further includes the following steps: B0: Determine whether the preset control mode in the operation command is the local mode; if it is the local mode, then instruct the local control cabinet in the hydropower station to take over the control and automatically trigger step B1; if it is not the local mode, then automatically enter the remote control mode and actively trigger step B1 through the operator in the remote background.

[0030] In step B1, the process of using each oil pump motor to load and build pressure in the hydraulic drive system is specifically as follows: B11: Preset the starting sequence and interval of each oil pump motor, and automatically start each oil pump motor at different times; B12: Delayed loading controls the solenoid valves of each oil pump motor, causing the oil pump motor to draw oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

[0031] In step B2, the door opening condition judgment process is as follows: preset the second safety pressure value P2 of the pressure detection device, and determine whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if it is less than P2, the door opening condition is met; if it is greater than or equal to P2, the door opening condition is not met.

[0032] The second safety pressure value P2 is between -0.005MPa and 0.001MPa.

[0033] As can be seen from the above, in step B, regardless of whether the control mode is local or remote, automatic control is provided for the equipment to ensure the normal operation of the pressure relief and gate opening process. Since some hydropower stations are located in remote areas, making remote communication difficult and prone to network communication anomalies during operation, these stations can utilize local mode, with the local control cabinet taking over control and automatically triggering step B1 to proceed to the subsequent process. Hydropower stations with convenient network communication can utilize remote control mode, eliminating the need for operators to remain on-site. Instead, remote operators can monitor the process from a remote station and issue commands remotely to actively trigger step B1 and proceed to the subsequent process.

[0034] In step B1, the local control cabinet or remote operator station automatically controls the depressurization of the pressurized water seal. Through empirical setting or comprehensive evaluation, the depressurization protection time is preset to ensure that the depressurization process of the pressurized water seal can be completed under normal circumstances. Then, the oil pump motors are started automatically in sequence, and the solenoid valves are loaded with a delay to prevent excessive starting current from causing voltage fluctuations and to ensure the stability of equipment operation.

[0035] In step B2, before opening the floodgate, the actual condition of the pressurized water seal is reconfirmed. The gate will only be opened if the pressurized water seal is determined to be below the second safety pressure value P2 after depressurization, thus ensuring the safety of the pressurized water seal. Furthermore, the second safety pressure value P2 can be adjusted according to actual needs; specifically, it can be set between -0.005 MPa and 0.001 MPa.

[0036] Example 4: See attached Figures 1-2 Based on Embodiment 3, in step B2, if the door opening conditions are not met, the door opening situation is determined to be abnormal, and an alarm signal is output.

[0037] In step B3, the pressure detection device continuously detects whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if the pressure is greater than P2 for more than 5 seconds, it is determined that the door opening is abnormal, and the process jumps to step B4 and outputs an alarm signal.

[0038] As can be seen from the above, if the pressure at the bottom of the pressurized water seal does not meet the second safety pressure value P2 when the gate opening condition is judged in step B2, or at any time during the gate opening process in step B3, it indicates that the pressure at the bottom of the pressurized water seal or the pressure detection equipment is abnormal. Therefore, in order to ensure the safety of equipment operation, step B3 of opening the floodgate is skipped, the operation command is directly reset, and an alarm signal is output. Specifically, the alarm signal can be output to the local control cabinet or the remote control operator station to notify the staff of the fault in time and to shut down and repair the equipment.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for controlling the opening of a flood discharge gate in a hydropower station with a pressurized water seal, comprising a pressure detection device for detecting the real-time pressure of the pressurized water seal, a hydraulic drive system for driving the opening and closing of the flood discharge gate, a plurality of oil pump motors, and a plurality of solenoid valves corresponding one-to-one with the oil pump motors, characterized in that, Includes the following steps: S0: Receives operating instructions when the floodgates are fully closed; S1: Determine the preset control mode in the execution command; If it is in maintenance mode, proceed to step A; If not in maintenance mode, proceed to step B; Step A includes: A1: Manually depressurize the pressurized water seal and determine whether the depressurization of the pressurized water seal is complete; A2: After the pressurized water seal is depressurized, manually control each oil pump motor to load and build up pressure in the hydraulic drive system; and then instruct the loaded hydraulic drive system to control the opening of the flood discharge gate; A3: Preset gate opening; once the floodgate reaches the preset opening, manually release the oil pressure from the oil pump motor and stop its operation. Step B includes: B1: Preset pressure relief protection time and automatically pressurize the water seal for pressure relief; once the pressure relief protection time is up, it is determined that the pressure relief is complete; then, the hydraulic drive system is pressurized using the motors of each oil pump; B2: Preset gate opening conditions; determine whether the gate opening conditions are met; if the gate opening conditions are met, proceed to step B3; if the gate opening conditions are not met, proceed directly to step B4. B3: Instruct the loaded hydraulic drive system to control the floodgate to open to the fully open state; B4: Run instruction reset; B5: Remove the oil pressure from the oil pump motor and stop its operation.

2. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 1, characterized in that, Step A1 specifically involves: A11: Determine whether the pressure detection device installed at the bottom of the pressurized water seal is operating normally. If it is operating normally, proceed to step A12; if it is not operating normally, proceed to step A13. A12: Manually control the pressurized water seal to release pressure; preset the first safe pressure value P1 of the pressure detection device; determine whether the pressure at the bottom of the pressurized water seal is less than the first safe pressure value P1; if it is less than P1, then the pressure release is complete; A13: Skip the pressure value judgment of the pressure detection device and manually perform the pressurization and depressurization operation of the water seal until the pressurization and depressurization of the water seal is completed.

3. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 2, characterized in that, The first safe pressure value P1 is between -0.005MPa and 0.001MPa.

4. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 1, characterized in that, Step A2 specifically involves: A21: After the pressurized water seal has been depressurized, manually start each oil pump motor in sequence using the operation button or touch screen; A22: Manually open the solenoid valves corresponding to the oil pump motor one by one, so that the oil pump motor draws oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

5. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 1, characterized in that: Step B also includes the following steps: B0: Determine whether the preset control mode in the operation command is the local mode; if it is the local mode, then instruct the local control cabinet in the hydropower station to take over the control and automatically trigger step B1; if it is not the local mode, then automatically enter the remote control mode and actively trigger step B1 through the operator in the remote background.

6. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 1, characterized in that, In step B1, the process of using each oil pump motor to load and build pressure in the hydraulic drive system is specifically as follows: B11: Preset the starting sequence and interval of each oil pump motor, and automatically start each oil pump motor at different times; B12: Delayed loading controls the solenoid valves of each oil pump motor, causing the oil pump motor to draw oil from the oil pump to supply oil to the hydraulic drive system, thereby enabling the hydraulic drive system to control the opening of the flood discharge gate.

7. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 6, characterized in that, In step B2, the door opening condition judgment process is as follows: preset the second safety pressure value P2 of the pressure detection device, and determine whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if it is less than P2, the door opening condition is met; if it is greater than or equal to P2, the door opening condition is not met.

8. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 7, characterized in that, The second safety pressure value P2 is between -0.005MPa and 0.001MPa.

9. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 7, characterized in that, In step B2, if the door opening conditions are not met, the door opening situation is determined to be abnormal, and an alarm signal is output to the outside.

10. The method for controlling the opening of a flood discharge gate in a hydropower station according to claim 7, characterized in that, In step B3, the pressure detection device continuously detects whether the pressure at the bottom of the pressurized water seal is less than the second safety pressure value P2; if the pressure is greater than P2 for more than 5 seconds, it is determined that the door opening is abnormal, and the process jumps to step B4 and outputs an alarm signal.

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