An underground water conservancy power station catch basin periodic blowdown control method

Abstract

The application discloses a kind of underground water conservancy collection well periodic sewage control method, install a clean water flushing pipeline in the water inlet part of submerged sewage pump, and set a flushing valve;A sewage valve is installed after the water outlet of submerged sewage pump.The flushing valve is opened before periodically starting submerged sewage pump, and the silt accumulated in the mouth of submerged sewage pump is flushed, to solve the problem that pump mouth is blocked by sediment after submerged sewage pump stops for a period of time, and the pump starting fails;After sewage is completed, promptly close the sewage valve to prevent sewage from flowing back in the pipeline.The periodic start-stop control of flushing valve, submerged sewage pump and sewage valve is automatically realized through process, without intervention of water conservancy personnel.In addition, if the flushing valve, submerged sewage pump and sewage valve described in the application are abnormal, the control method process of the application can ensure that the flushing valve and sewage valve are in closed state, and the submerged sewage pump is in stop state, to ensure equipment safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground hydropower station, more particularly to a method for controlling regular sewage discharge of a collecting well of an underground hydropower station. BACKGROUND

[0002] Some hydropower stations have their plant located in an underground tunnel. The collecting well for leakage drainage of the plant, the collecting well for leakage drainage of unit maintenance, the collecting well for leakage drainage of tailrace regulation, and other parts are prone to sludge accumulation at the bottom of the collecting well due to the fact that the leakage water in the mountain carries a large amount of sediment and has a relatively hard water quality. In order to avoid the adverse effects of sludge accumulation on the drainage system, a submersible sewage pump (hereinafter referred to as a sewage pump) is generally installed at the bottom of the collecting well, and the staff of the hydropower station manually operates the sewage pump to discharge sewage according to the requirements.

[0003] However, this manual and regular starting of the sewage pump for sewage discharge consumes a large amount of manpower and has a low work efficiency. In addition, the pump port is prone to being blocked by the sediment after the sewage pump is stopped for a period of time, which may cause the sewage pump to fail to start. Moreover, the sewage discharge pipeline of the sewage pump of some underground hydropower stations is relatively long, and part of the sewage in the pipeline may flow back after the sewage pump is stopped, thereby affecting the effect of regular sewage discharge. SUMMARY

[0004] Therefore, the present application provides a method for controlling regular sewage discharge of a collecting well of an underground hydropower station to solve the technical problems in the background art.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A method for controlling regular sewage discharge of a collecting well of an underground hydropower station, comprising the following steps:

[0007] Step 1: initializing the control flow of the submersible sewage system;

[0008] Step 2: counting the cumulative downtime of the submersible sewage pump, and if the cumulative downtime of the submersible sewage pump exceeds a set value T1, jumping to step 3, otherwise, continuing to execute step 2;

[0009] Step 3: judging whether the underground hydropower station collecting well regular sewage discharge control equipment meets the starting condition, and if so, jumping to step 4;

[0010] Step 4: detecting whether the flush valve is in a fully open state, and if not, jumping to step 5;

[0011] Step 5: outputting an operation of opening the flush valve;

[0012] Step 6: monitoring the time length of the operation of opening the flush valve, and if the time length exceeds a maximum allowed time length T2 of opening the flush valve, jumping to step 7;

[0013] Step 7: flush valve opening failure alarm, then jump to step 30; otherwise jump to step 4, continue to open the flush valve operation until the flush valve is opened to the full open position; if step 4 flush valve is in the full open state, jump to step 8;

[0014] Step 8: flush the accumulated silt at the sewage pump port, if the flush time reaches the preset value T3, jump to step 9; otherwise, continue to execute step 8;

[0015] Step 9: detect whether the flush valve is in the full closed state, if the flush valve is not in the full closed state, jump to step 10;

[0016] Step 10: output the flush valve closing operation;

[0017] Step 11: monitor the duration of the flush valve closing operation, if the duration exceeds the maximum allowed duration T4 of the flush valve closing, jump to step 12;

[0018] Step 12: flush valve closing failure alarm, then end the underground hydropower station catch basin regular blowdown control process; otherwise jump to step 9, continue to close the flush valve operation until the flush valve is closed to the full closed position; if step 9 flush valve is in the full closed state, jump to step 13;

[0019] Step 13: detect whether the blowdown valve is in the full open state, if the blowdown valve is not in the full open state, jump to step 14;

[0020] Step 14: output the blowdown valve opening operation;

[0021] Step 15: monitor the duration of the blowdown valve opening operation, if the duration exceeds the maximum allowed duration T5 of the blowdown valve opening, jump to step 16;

[0022] Step 16: blowdown valve opening failure alarm, then jump to step 30; otherwise jump to step 13, continue to open the blowdown valve operation until the blowdown valve is opened to the full open position; if step 13 blowdown valve is in the full open state, jump to step 17;

[0023] Step 17: detect whether the sewage pump is in the running state, if the sewage pump is not in the running state, jump to step 18;

[0024] Step 18: output the sewage pump starting operation;

[0025] Step 19: monitor the duration of the sewage pump starting process, if the duration exceeds T6, jump to step 20;

[0026] Step 20: the submersible sewage pump start failure fault alarm, then jump to step 30; otherwise jump to step 17, continue to start the submersible sewage pump operation until the submersible sewage pump start complete, in the normal operation state; if step 17 submersible sewage pump in the running state, jump to step 21;

[0027] Step 21: start the submersible sewage pump to start the underground hydropower station corresponding to the catch basin sewage, if the submersible sewage pump running time to jump to step 22; otherwise continue to step 21;

[0028] Step 22: detect whether the submersible sewage pump is in the stop state, if the submersible sewage pump is not in the stop state, jump to step 23;

[0029] Step 23: output stop submersible sewage pump operation;

[0030] Step 24: monitor the time length of the stop submersible sewage pump process, if the length exceeds T8, jump to step 25;

[0031] Step 25: submersible sewage pump stop failure fault alarm, then end the underground hydropower station catch basin regular sewage control process; otherwise jump to step 22, continue to stop the submersible sewage pump operation until the submersible sewage pump stop complete, in the stop state; if step 22 submersible sewage pump in the stop state, jump to step 26;

[0032] Step 26: detect whether the sewage valve is in the full closed state, if the sewage valve is not in the full closed state, jump to step 27;

[0033] Step 27: output close sewage valve operation;

[0034] Step 28: monitor the time length of the close sewage valve operation, if the length exceeds the maximum allowable length T9 of the sewage valve closing, jump to step 29;

[0035] Step 29: sewage valve closing failure fault alarm, then end the underground hydropower station catch basin regular sewage control process; otherwise jump to step 26, continue to close the sewage valve operation until the sewage valve is closed to the full closed position; if step 26 sewage valve in the full closed state, jump to step 2, start a new round of control cycle.

[0036] In some embodiments, further comprising:

[0037] Step 30: flush valve open failure, sewage valve open failure, pump start failure, any one of the three faults will jump to step 30, through step 30, will prohibit the opening of the flush valve output, open sewage valve output, start submersible sewage pump output, then forcedly close flush valve output, close sewage valve output, stop submersible sewage pump output; then jump to step 31;

[0038] Step 31: monitor the forced operation duration, if the forced operation duration does not exceed T 10 , then jump to step 32; otherwise, jump to step 33;

[0039] Step 32: monitor whether the full-closed flush valve, full-closed blowdown valve and stopped submersible sewage pump state have all appeared, if yes, then jump to step 33, otherwise, jump to step 31;

[0040] Step 33: reset all forced operation outputs, including the forced-closed flush valve output, closed blowdown valve output and stopped submersible sewage pump output.

[0041] The present application has the beneficial effects compared with the prior art:

[0042] In order to solve the problems of low efficiency, pump starting failure and sewage backflow after pump stopping of the manual periodic starting of the submersible sewage pump, the present application proposes a periodic blowdown control method for a collecting well of an underground hydropower station, a clean water flushing pipeline is installed at the water inlet of the submersible sewage pump, and a flushing valve is arranged; a blowdown valve is arranged at the rear side of the water outlet of the submersible sewage pump. Before starting the submersible sewage pump periodically, the flushing valve is opened to flush the accumulated silt at the pump port, so as to solve the problem of pump starting failure caused by the pump port being blocked by the sediment after the pump is stopped for a period of time; after the blowdown is completed, the blowdown valve is closed in time to prevent the sewage in the pipeline from flowing back.

[0043] The periodic starting and stopping control of the flushing valve, the submersible sewage pump and the blowdown valve is automatically realized through the flow process without the intervention of the hydropower station staff. In addition, when the flushing valve, the submersible sewage pump and the blowdown valve of the present application appear abnormal, the control method flow process of the present application can ensure that the flushing valve and the blowdown valve are in the closed state and the submersible sewage pump is in the stopped state as much as possible, so as to ensure the safety of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a flow chart of a periodic blowdown control method for a collecting well of an underground hydropower station; DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0046] The embodiments of the present application will be described in detail below with reference to the drawings.

[0047] In the description of the present application, it is necessary to point out that, unless explicitly defined and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the description of the present application, it is necessary to understand that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0050] The following will be described in detail Figure 1 A periodic blowdown control method for a groundwater-type hydropower station catch basin will be described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0051] Embodiment 1:

[0052] As shown in Figure 1 A periodic blowdown control method for a groundwater-type hydropower station catch basin, as shown in Figure 1

[0053] 1. Step 1: First, initialize the submersible blowdown system control process, including resetting all control commands, powering on the electrical control equipment and self-checking, etc. After step 1 is completed, jump to step 2.

[0054] ​2. Step 2: Calculate the cumulative downtime of the submersible sewage pump. If the cumulative downtime of the submersible sewage pump exceeds the value T1 set by the staff of the hydropower station, it indicates that the regular sewage discharge time of the submersible pump has arrived, and the process jumps to Step 3 to start the sewage equipment flow control; otherwise, it continues to loop in this step. The interval T1 of the regular start of the submersible pump depends on the actual situation of the corresponding catch basin silt of the underground hydropower station and can be determined based on actual field tests combined with the management requirements of the power station, and can be set by the staff of the power station on the human-machine interaction interface. Preferably, the value is 168h.

[0055] 3. Step 3: Before starting the regular sewage control equipment of the catch basin of the underground hydropower station, it is necessary to ensure that the flushing valve, sewage valve, and submersible pump are ready; otherwise, it continues to loop in this step until all these devices are ready to meet the requirements of the regular sewage control of the catch basin of the underground hydropower station. If the conditions of Step 3 are met, the process jumps to Step 4.

[0056] 4. Open the flushing valve operation, including Step 4, Step 5, Step 6, and Step 7. First, Step 4 detects whether the flushing valve is in the fully open state. If the flushing valve is not in the fully open state, Step 5 outputs the open flushing valve operation. Step 6 monitors the time length of the open flushing valve operation. If the time length exceeds the maximum allowed time T2 for opening the flushing valve, it indicates that the flushing valve opening operation is abnormal, and the process jumps to Step 7, sets the flushing valve opening failure fault alarm, and then jumps to Step 30; otherwise, it jumps to Step 4 to continue the open flushing valve operation until the flushing valve is opened to the fully open position. If Step 4 is in the fully open state, the process jumps to Step 8. The maximum allowed time T2 for opening the flushing valve depends on the actual time of opening the valve by the electric operation mechanism of the flushing valve and can be determined based on the equipment manual and actual field tests, and can be set by the staff of the power station on the human-machine interaction interface. Preferably, the value is 30s.

[0057] 5. Step 8: Flush the accumulated silt at the outlet of the submersible pump to prevent the pump from being blocked by the sediment and failing to start. If the flushing time is up, the process jumps to Step 9; otherwise, it continues to loop in this step. The flushing time T3 of the submersible pump depends on the actual situation of the corresponding catch basin silt of the underground hydropower station and can be determined based on actual field tests combined with the management requirements of the power station, and can be set by the staff of the power station on the human-machine interaction interface. Preferably, the value is 5min.

[0058] 6. Closing flush valve operation, comprising steps 9, 10, 11, 12. First, check if the flush valve is in the fully closed state by step 9, if the flush valve is not in the fully closed state, output the closing flush valve operation by step 10. Monitor the time length of the closing flush valve operation by step 11, if the time length exceeds the maximum allowed time length T4 of closing the flush valve, it means that the flush valve closing operation is abnormal, jump to step 12, set the flush valve closing failure fault alarm by step 12, and then end the underground hydropower station sump regular blowdown control process; otherwise, jump to step 9, continue the closing flush valve operation until the flush valve is closed to the fully closed position. If step 9 is the flush valve in the fully closed state, jump to step 13. Wherein, the maximum allowed time length T4 of closing the flush valve depends on the actual time of closing the valve by the electric operation mechanism of the flush valve, which can be determined according to the equipment manual and the actual test on site, and can be set by the power station staff on the man-machine interface. Preferably, the value is 35s.

[0059] 7. Opening blowdown valve operation, comprising steps 13, 14, 15, 16. First, check if the blowdown valve is in the fully open state by step 13, if the blowdown valve is not in the fully open state, output the opening blowdown valve operation by step 14. Monitor the time length of the opening blowdown valve operation by step 15, if the time length exceeds the maximum allowed time length T5 of opening the blowdown valve, it means that the blowdown valve opening operation is abnormal, jump to step 16, set the blowdown valve opening failure fault alarm by step 16, and then jump to step 30; otherwise, jump to step 13, continue the opening blowdown valve operation until the blowdown valve is opened to the fully open position. If step 13 is the blowdown valve in the fully open state, jump to step 17. Wherein, the maximum allowed time length T5 of opening the blowdown valve depends on the actual time of opening the valve by the electric operation mechanism of the blowdown valve, which can be determined according to the equipment manual and the actual test on site, and can be set by the power station staff on the man-machine interface. Preferably, the value is 33s.

[0060] 8. Start-up of the submersible sewage pump operation, comprising steps 17, 18, 19, 20. First, it is detected by step 17 whether the submersible sewage pump is in a running state, if the submersible sewage pump is not in a running state, then the start-up of the submersible sewage pump operation is output by step 18. The time length consumed in the start-up of the submersible sewage pump is monitored by step 19, if the time length exceeds T6, then it is indicated that the start-up operation of the submersible sewage pump is abnormal, jumping to step 20, the submersible sewage pump start-up failure fault alarm is set by step 20, and then jumping to step 30; otherwise, jumping to step 17, continuing the start-up of the submersible sewage pump operation until the start-up of the submersible sewage pump is completed and in a normal running state. If step 17 is in a running state, then jumping to step 21. Wherein, the start-up monitoring time length T6 of the submersible sewage pump depends on the mechanical running characteristics of the submersible sewage pump and the start-up time length setting value of the soft start equipment, which can be determined according to theoretical calculation and field calibration test, and can be set by the power station staff on the man-machine interactive interface. Preferably, the value is 11s.

[0061] 9. Step 21: Start-up of the submersible sewage pump starts to discharge sewage for the corresponding collecting well of the underground hydropower station, if the running time of the submersible sewage pump reaches T7, then jumping to step 22; otherwise, always in this step cycle. Wherein, the submersible sewage pump running sewage discharge time T7 depends on the siltation amount of the collecting well and the sewage discharge speed of the submersible sewage pump and other factors, which can be determined according to the actual test on site and combined with the management requirements of the hydropower station, and can be set by the power station staff on the man-machine interactive interface. Preferably, the value is 30min.

[0062] 10. Stop of the submersible sewage pump operation, comprising steps 22, 23, 24, 25. First, it is detected by step 22 whether the submersible sewage pump is in a stop state, if the submersible sewage pump is not in a stop state, then the stop of the submersible sewage pump operation is output by step 23. The time length consumed in the stop of the submersible sewage pump is monitored by step 24, if the time length exceeds T8, then it is indicated that the stop operation of the submersible sewage pump is abnormal, jumping to step 25, the submersible sewage pump stop failure fault alarm is set by step 25, and then the underground hydropower station collecting well regular sewage discharge control flow is ended; otherwise, jumping to step 22, continuing the stop of the submersible sewage pump operation until the stop of the submersible sewage pump is completed and in a stop state. If step 22 is in a stop state, then jumping to step 26. Wherein, the start-up monitoring time length T8 of the submersible sewage pump depends on the mechanical running characteristics of the submersible sewage pump and the stop type of the soft start equipment and other parameters, which can be determined according to theoretical calculation and field calibration test, and can be set by the power station staff on the man-machine interactive interface. Preferably, the value is 7s.

[0063] 11. The closing blowdown valve operation includes steps 26, 27, 28, 29. First, step 26 detects whether the blowdown valve is in the fully closed state, if not, step 27 outputs the closing blowdown valve operation. Step 28 monitors the length of the closing blowdown valve operation, if the length exceeds the maximum allowed length T9 of the blowdown valve closing, it means that the blowdown valve closing operation is abnormal, step 29 is jumped to, the blowdown valve closing failure fault alarm is set, and then the underground water power station sump well regular blowdown control process is ended; otherwise, step 26 is jumped to, the closing blowdown valve operation is continued until the blowdown valve is closed to the fully closed position. If step 26 is the blowdown valve in the fully closed state, step 2 is jumped to, and a new control cycle is started. The maximum allowed length T9 of the blowdown valve closing depends on the actual time of the blowdown valve electric operation mechanism closing the valve, which can be determined according to the equipment manual and the actual test on site, and can be set by the power station staff on the man-machine interaction interface. Preferably, the value is 37s.

[0064] 12. The abnormal treatment process includes steps 30, 31, 32, 33. Any one of the three faults of the flushing valve opening failure, the blowdown valve opening failure, and the pump starting failure will jump to step 30, which will prohibit the flushing valve opening output, the blowdown valve opening output, and the starting of the submerged sewage pump output, and then forcibly close the flushing valve output, close the blowdown valve output, and stop the submerged sewage pump output. Then step 31 is jumped to, which monitors the length of the forced operation. If the length of the forced operation does not exceed T 10 , step 32 is jumped to; otherwise, step 33 is jumped to. Step 32 monitors whether the flushing valve is fully closed, the blowdown valve is fully closed, and the submerged sewage pump is stopped. If so, step 33 is jumped to; otherwise, step 31 is jumped to. Step 33 resets all forced operation outputs, including forcibly closing the flushing valve output, closing the blowdown valve output, and stopping the submerged sewage pump output. The forced operation monitoring length T 10 depends on the maximum value of the flushing valve closing time, the blowdown valve closing time, and the submerged sewage pump stopping process time, and needs to leave a certain margin, which can be determined according to the actual test on site, and can be set by the power station staff on the man-machine interaction interface. Preferably, the value is 41s.

[0065] 13. Steps 7 and 12 will cause the flushing valve readiness condition not to be met; steps 16 and 29 will cause the blowdown valve readiness condition not to be met; steps 20 and 25 will cause the submerged sewage pump readiness condition not to be met. The above faults need to be confirmed by the power station staff before they can be eliminated. After the faults are eliminated, the step 1 of the present application is manually rejumped to, and the submerged sewage system control process initialization operation is reperformed.

[0066] 1. It should be noted that: T1 to T10 The time parameter can be set through the man-machine interaction device, and the fixed value visual management requirement of the hydropower station is realized.

[0067] 2. The application provides a kind of underground water conservancy station catch basin periodic blowdown control method, this control method is through the automatic control of underground water conservancy station corresponding catch basin flush valve, submersible sewage pump, blowdown valve operation periodically, realizes automatic periodic blowdown function, without water conservancy station staff intervention.

[0068] 3. When flush valve opening failure, blowdown valve opening failure, submersible sewage pump start failure fault occurs, the present application can be closed flush valve operation, close blowdown valve operation, stop submersible sewage pump operation in time output, try to ensure that flush valve, blowdown valve is in closed state, submersible sewage pump is in stop state, ensure equipment safety.

[0069] Any modification, equivalent replacement and improvement etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling periodic sewage discharge from a water collection well of an underground hydropower station, characterized by: include: Step 1: Initialize the submersible sewage system control process; Step 2: Count the cumulative downtime of the submersible sewage pump. If the cumulative downtime of the submersible sewage pump exceeds the set value T1, jump to step 3; otherwise, continue to step 2. Step 3: Determine whether the periodic sewage discharge control device of the underground hydropower station water collection well meets the start-up conditions. If the start-up conditions are met, jump to step 4; Step 4: Check whether the flush valve is in a fully open state. If the flush valve is not in a fully open state, jump to step 5; Step 5: Output the operation of opening the flushing valve; Step 6: Monitor the duration of the flush valve operation. If the duration exceeds the maximum allowable duration T2 of the flush valve opening, jump to step 7. Step 7: If the flush valve fails to open, a fault alarm is triggered, and the process then jumps to step 30; otherwise, the process jumps to step 4 and continues to open the flush valve until it is fully open. If the flush valve is fully open in step 4, the process jumps to step 8. Step 8: Flush the silt accumulated at the submersible sewage pump outlet. If the flushing time reaches the preset value T3, jump to step 9; otherwise, continue to step 8; Step 9: Check whether the flush valve is in a fully closed state. If the flush valve is not in a fully closed state, jump to step 10; Step 10: Output the flush valve closing operation; Step 11: Monitor the duration of the flush valve closing operation. If the duration exceeds the maximum allowable flush valve closing duration T4, jump to step 12; Step 12: A fault alarm is triggered when the flushing valve fails to close, and the regular sewage discharge control process of the underground hydropower station water collection well is terminated; Otherwise, jump to step 9 and continue closing the flush valve until the flush valve is closed to the fully closed position; If the flush valve is in the fully closed state in step 9, jump to step 13; Step 13: Check whether the drain valve is in a fully open state. If the drain valve is not in a fully open state, jump to step 14; Step 14: Output the operation of opening the drain valve; Step 15: Monitor the duration of the drain valve opening operation. If the duration exceeds the maximum allowable drain valve opening duration T5, jump to step 16. Step 16: If the drain valve fails to open, a fault alarm is triggered, and the process then jumps to step 30; otherwise, the process jumps to step 13 and continues to open the drain valve until it is fully open. If the drain valve is fully open in step 13, the process jumps to step 17. Step 17: Check whether the submersible sewage pump is in operation. If the submersible sewage pump is not in operation, jump to step 18; Step 18: Output and start the submersible sewage pump operation; Step 19: Monitor the time taken to start the submersible sewage pump. If the time exceeds T6, jump to step 20. Step 20: If the submersible sewage pump fails to start, a fault alarm is generated, and the process then jumps to step 30; otherwise, the process jumps to step 17 and continues to start the submersible sewage pump until the submersible sewage pump is started and in normal operation; if the submersible sewage pump is in operation in step 17, the process jumps to step 21; Step 21: Start the submersible sewage pump to start draining sewage from the corresponding water collection well of the underground hydropower station. If the submersible sewage pump operation time is up, jump to step 22; otherwise, continue to step 21; Step 22: Detect whether the submersible sewage pump is in a stopped state. If the submersible sewage pump is not in a stopped state, jump to step 23; Step 23: Output to stop the submersible sewage pump operation; Step 24: Monitor the time taken to stop the submersible sewage pump. If the time exceeds T8, jump to step 25. Step 25: If the submersible sewage pump fails to stop, a fault alarm is generated, and the underground hydropower station water collection well regular sewage discharge control process is terminated; otherwise, the process jumps to step 22, and the submersible sewage pump operation is continued to be stopped until the submersible sewage pump is completely stopped and is in a stopped state; if the submersible sewage pump is in a stopped state in step 22, the process jumps to step 26; Step 26: Check whether the drain valve is in a fully closed state. If the drain valve is not in a fully closed state, jump to step 27; Step 27: Output the operation of closing the drain valve; Step 28: Monitor the duration of the drain valve closing operation. If the duration exceeds the maximum allowable drain valve closing duration T9, jump to step 29. Step 29: A failure alarm is triggered when the sewage valve fails to close, and the regular sewage discharge control process of the underground hydropower station water collection well is terminated; Otherwise, jump to step 26 and continue closing the drain valve until the drain valve is closed to the fully closed position; If the drain valve is in the fully closed state in step 26, jump to step 2 and restart the next round of control cycle; Also includes: Step 30: If any of the three faults, namely, the flush valve failure to open, the drain valve failure to open, and the pump failure to start, occurs, the process will jump to step 30. In step 30, the flush valve output, the drain valve output, and the submersible sewage pump output will be prohibited from being opened, and then the flush valve output, the drain valve output, and the submersible sewage pump output will be forcibly closed. Then, the process will jump to step 31. Step 31: Monitor the forced operation duration. If the forced operation duration does not exceed T 10 , then jump to step 32; otherwise jump to step 33; Step 32: Monitor whether the flush valve is fully closed, the drain valve is fully closed, and the submersible sewage pump is stopped. If so, jump to step 33; otherwise, jump to step 31; Step 33: Reset all forced operation outputs, including forced closing of flush valve output, closing of drain valve output, and stopping of submersible sewage pump output.

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