Strategy of flood-proof powerhouse for giant hydroelectric generating unit

Abstract

A flood-resistant powerhouse strategy for giant hydroelectric generator units employs a flood-resistant powerhouse level sensor system, consisting of three sets of level switches and one set of level transmitters, installed between every two units on the lowest level of the powerhouse. When the water level exceeds the system's maximum, a two-out-of-three signal triggers the shutdown and door closure of adjacent units. High water levels also trigger a shutdown and door closure check, locking the high water level signal. The analog panel LCU (Limited Control Unit) and local cabinet in the powerhouse are equipped with emergency door closure buttons for corresponding units. Shutdown and door closure commands are transmitted through two independent redundant channels: one in the analog panel LCU and one in the unit LCU. This approach improves the reliability of sensor signal acquisition, transmission, and action, avoiding the risk of erroneous signal output. The logic for triggering shutdown and door closure due to high water levels is more rational, ensuring that the giant hydroelectric generator units do not experience erroneous signals leading to unit shutdown and door closure. It also improves the timeliness and accuracy of emergency response to flooding incidents by operation and maintenance personnel.

Description

Technical Field

[0001] This invention belongs to the field of hydropower plant flood prevention technology, and relates to a flood prevention strategy for a giant hydro-turbine generator unit. Background Technology

[0002] When the second upper limit of the flood-proof sensor in the powerhouse of the hydro-generator unit is activated, an emergency shutdown procedure must be triggered, and the inlet gate must be closed immediately. Currently, the flood-proof powerhouse strategy is relatively simple and cannot avoid single-point signal triggering. For giant hydro-generator units, the power system's requirements for grid security, stability, and grid quality are increasingly stringent. To ensure the safe operation of the grid and generator units, it is essential to prevent malfunctioning signals from causing unit shutdowns. The safe and stable operation of giant hydro-generator units is crucial to the safety of the entire power grid. Furthermore, in the event of a powerhouse flooding accident, immediate shutdown and gate closure are necessary to prevent larger hydraulic mechanical accidents. A fast, accurate, and reliable flood-proof powerhouse strategy is vital for the safe and stable operation of the entire power plant and the power grid. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a flood-proof powerhouse strategy for giant hydro-generator units. This strategy involves installing a flood-proof powerhouse level sensor system, including three sets of level switches and one set of level transmitters, between every two units on the lowest level of the powerhouse. When the water level is too high, a three-way selection triggers two actions to shut down and close the doors of adjacent units. High water levels also trigger a shutdown and door closure check, locking the high water level signal. The analog panel LCU (Limited Control Unit) local cabinet in the powerhouse is equipped with emergency door closure buttons for the corresponding units. The flood-proof powerhouse shutdown and door closure commands are transmitted through two independent redundant channels: the analog panel LCU and the unit LCU.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a strategy for preventing flooding of the power plant of a giant hydro-generator unit, which includes the following steps:

[0005] Step 1: Install a flood-proof liquid level sensor on the lowest floor of the factory building, i.e., the operating corridor floor.

[0006] Step 2: When the water level is too high, the signal action selects two out of three to trigger the shutdown and gate closure of two adjacent units;

[0007] Step 3: If the water level is too high, the system will shut down and the door will be closed based on the high water level signal.

[0008] Step 4: Set the corresponding unit's emergency shutdown and door closing button for flooding in the LCU factory local cabinet;

[0009] Step 5: The commands for stopping the plant and closing the doors in response to flooding are sent through two independent redundant channels: the simulation panel LCU and the unit LCU.

[0010] Step 1 specifically includes:

[0011] Step 1-1: Install a set of flood-proof liquid level sensors between every two units in the plant operation corridor. Each set of sensors includes three sets of float-type liquid level switches and one float-type liquid level transmitter.

[0012] Steps 1-2: Each set of float-type liquid level switches has a high water level and an excessively high water level switch contact. The three sets of float-type liquid level switches output 6 switching signals to the local cabinet of the analog panel LCU in the plant, namely, high water level 1, excessively high water level 1, high water level 2, excessively high water level 2, high water level 3, and excessively high water level 3. The analog panel LCU sends the above signals to the monitoring system. When the above signals are activated, the monitoring system's event overview table and screen will have corresponding alarms.

[0013] Steps 1-3: The level transmitter outputs a 4~20mA analog signal to the local cabinet of the analog panel LCU in the factory, and the analog panel LCU sends this signal to the monitoring system.

[0014] Steps 1-4: Set the upper limit and upper limit of the water level in the monitoring system database. When the analog water level signal output by the level transmitter is greater than the upper limit of the water level, the monitoring system event list and screen will report an alarm indicating that the water level exceeds the upper limit. When it is greater than the upper limit of the water level, an alarm will be reported indicating that the water level exceeds the upper limit.

[0015] Step 2 specifically includes:

[0016] Step 2-1: The high water level and excessively high water level switch signals of the water level sensor in the flood-proof factory building are used in the logic judgment of stopping the machine and closing the door in the flood-proof factory building. The analog water level signal is only displayed on the monitoring system screen and does not participate in the control of stopping the machine and closing the door in the flood-proof factory building.

[0017] Step 2-2: The PLC program of the simulation screen LCU performs a 3-to-2 logic judgment on the 3 high water level signals of each set. If any 2 of the 3 high water level signals are active, the set of flood prevention and flood control action instructions will be issued.

[0018] Steps 2-3: The flood-proof plant door closing command will be sent to the two adjacent units to complete the shutdown and door closing control. That is, when the flood-proof plant operation is activated between the 1-2F units, a command will be issued to shut down the 1F unit and close the door, and the 2F unit will shut down and close the door.

[0019] Step 3 specifically includes:

[0020] To prevent accidental activation of contacts due to excessively high water levels, which could lead to incorrect shutdown and door closing commands in the flood-prone factory, the PLC program of the analog panel LCU blocks the high water level signal when it is activated. In other words, the high water level and excessively high water level signals in the same group are only reliable when they are activated simultaneously, and only then do they participate in the shutdown and door closing logic judgment.

[0021] Step 4 specifically includes:

[0022] Step 4-1: When the operation and maintenance personnel discover that a certain unit has an emergency situation of flooding of the plant, they press the flood-proof plant door closing button of the unit to trigger the unit's rapid shutdown process and quickly close the unit's water inlet quick door to prevent the flooding accident from occurring and escalating.

[0023] Step 4-2: The PLC program of the simulation screen LCU is set with a reliable judgment logic for the button press of the flood-proof plant shutdown and door closing button. Only one unit will be running within a specified time to ensure that the flood-proof plant shutdown and door closing button is pressed. If multiple buttons are pressed at the same time, the shutdown and door closing command will not be output.

[0024] Step 5 specifically includes:

[0025] Step 5-1: The simulation panel LCU has an independent remote cabinet at the water inlet. The local cabinet of the simulation panel LCU in the plant and the remote cabinet at the water inlet of the simulation panel LCU are connected by an independent optical cable, which is a completely different path from the unit LCU.

[0026] Step 5-2: When the door closing button of a certain unit's flood-proof plant is pressed, the door closing control can be completed not only by sending a command to the unit's inlet fast door control system through the analog panel LCU, but also by sending the unit's LCU to the unit's inlet fast door control system.

[0027] The main beneficial effects of this invention are as follows:

[0028] This improves the reliability of sensor signal acquisition, transmission, and operation in flood-resistant factory buildings, avoiding the risk of erroneous signal output.

[0029] The logic for triggering the shutdown and door closing when the water level in the flood-prone factory building is too high and the shutdown and door closing button is more reasonable, ensuring that the giant hydro-generator unit does not have erroneous operation signals that would cause the unit to shut down and the door to close.

[0030] The installation of a shutdown and door-closing button in the flood-prone factory building improves the timeliness and accuracy of emergency response by operation and maintenance personnel in the event of a flood-prone factory building. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a layout diagram of the liquid level sensor for a flood-proof factory building according to the present invention.

[0033] Figure 2 This is a configuration diagram of the liquid level sensor for a flood-proof factory building according to the present invention.

[0034] Figure 3This is the logic diagram for the shutdown and door closing command triggered by excessively high water level in this invention.

[0035] Figure 4 This is a diagram illustrating the signal transmission path for the shutdown and door closing of a flood-resistant factory building according to the present invention. Detailed Implementation

[0036] like Figures 1-4 In this paper, a strategy for preventing flooding of a giant hydroelectric generator unit includes the following steps:

[0037] Step 1: Install a flood-proof liquid level sensor on the lowest floor of the factory building, i.e., the operating corridor floor.

[0038] Step 2: When the water level is too high, the signal action selects two out of three to trigger the shutdown and gate closure of two adjacent units;

[0039] Step 3: If the water level is too high, the system will shut down and the door will be closed based on the high water level signal.

[0040] Step 4: Set the corresponding unit's emergency shutdown and door closing button for flooding in the LCU factory local cabinet;

[0041] Step 5: The commands for stopping the plant and closing the doors in response to flooding are sent through two independent redundant channels: the simulation panel LCU and the unit LCU.

[0042] In the preferred embodiment, step 1 specifically includes:

[0043] Step 1-1: Install a set of flood-proof liquid level sensors between every two units in the plant operation corridor. Each set of sensors includes three sets of float-type liquid level switches and one float-type liquid level transmitter.

[0044] Steps 1-2: Each set of float-type liquid level switches has a high water level and an excessively high water level switch contact. The three sets of float-type liquid level switches output 6 switching signals to the local cabinet of the analog panel LCU in the plant, namely, high water level 1, excessively high water level 1, high water level 2, excessively high water level 2, high water level 3, and excessively high water level 3. The analog panel LCU sends the above signals to the monitoring system. When the above signals are activated, the monitoring system's event overview table and screen will have corresponding alarms.

[0045] Steps 1-3: The level transmitter outputs a 4~20mA analog signal to the local cabinet of the analog panel LCU in the factory, and the analog panel LCU sends this signal to the monitoring system.

[0046] Steps 1-4: Set the upper limit and upper limit of the water level in the monitoring system database. When the analog water level signal output by the level transmitter is greater than the upper limit of the water level, the monitoring system event list and screen will report an alarm indicating that the water level exceeds the upper limit. When it is greater than the upper limit of the water level, an alarm will be reported indicating that the water level exceeds the upper limit.

[0047] In the preferred embodiment, step 2 specifically includes:

[0048] Step 2-1: The high water level and excessively high water level switch signals of the water level sensor in the flood-proof factory building are used in the logic judgment of stopping the machine and closing the door in the flood-proof factory building. The analog water level signal is only displayed on the monitoring system screen and does not participate in the control of stopping the machine and closing the door in the flood-proof factory building.

[0049] Step 2-2: The PLC program of the simulation screen LCU performs a 3-to-2 logic judgment on the 3 high water level signals of each set. If any 2 of the 3 high water level signals are active, the set of flood prevention and flood control action instructions will be issued.

[0050] Steps 2-3: The flood-proof plant door closing command will be sent to the two adjacent units to complete the shutdown and door closing control. That is, when the flood-proof plant operation is activated between the 1-2F units, a command will be issued to shut down the 1F unit and close the door, and the 2F unit will shut down and close the door.

[0051] In the preferred embodiment, step 3 specifically includes:

[0052] To prevent accidental activation of contacts due to excessively high water levels, which could lead to incorrect shutdown and door closing commands in the flood-prone factory, the PLC program of the analog panel LCU blocks the high water level signal when it is activated. In other words, the high water level and excessively high water level signals in the same group are only reliable when they are activated simultaneously, and only then do they participate in the shutdown and door closing logic judgment.

[0053] In the preferred embodiment, step 4 specifically includes:

[0054] Step 4-1: When the operation and maintenance personnel discover that a certain unit has an emergency situation of flooding of the plant, they press the flood-proof plant door closing button of the unit to trigger the unit's rapid shutdown process and quickly close the unit's water inlet quick door to prevent the flooding accident from occurring and escalating.

[0055] Step 4-2: The PLC program of the simulation screen LCU is set with a reliable judgment logic for the button press of the flood-proof plant shutdown and door closing button. Only one unit will be running within a specified time to ensure that the flood-proof plant shutdown and door closing button is pressed. If multiple buttons are pressed at the same time, the shutdown and door closing command will not be output.

[0056] In the preferred embodiment, step 5 specifically includes:

[0057] Step 5-1: The simulation panel LCU has an independent remote cabinet at the water inlet. The local cabinet of the simulation panel LCU in the plant and the remote cabinet at the water inlet of the simulation panel LCU are connected by an independent optical cable, which is a completely different path from the unit LCU.

[0058] Step 5-2: When the door closing button of a certain unit's flood-proof plant is pressed, the door closing control can be completed not only by sending a command to the unit's inlet fast door control system through the analog panel LCU, but also by sending the unit's LCU to the unit's inlet fast door control system.

[0059] The working principle of the above scheme is:

[0060] During the actual operation of the hydro-generator unit, when the water level signal of the flood-proof powerhouse sensor is triggered, a logic of selecting two out of three high-level signals and blocking high-level signals is adopted to avoid single-point signal malfunctions in signal processing. The use of redundant and independent signal acquisition sensors and transmission paths can avoid external environmental interference and improve the reliability of the flood-proof powerhouse operation.

[0061] The strategy of this invention ensures that giant hydro-generator units do not experience malfunctions that could lead to accidental shutdowns, and avoids the risk of shutdowns due to single-point signal activation. This contributes to the safe and stable operation of the power grid and hydro-generator units.

[0062] Its advantages are:

[0063] This improves the reliability of sensor signal acquisition, transmission, and operation in flood-resistant factory buildings, avoiding the risk of erroneous signal output.

[0064] The logic for triggering the shutdown and door closing when the water level in the flood-prone factory building is too high and the shutdown and door closing button is more reasonable, ensuring that the giant hydro-generator unit does not have erroneous operation signals that would cause the unit to shut down and the door to close.

[0065] The installation of a shutdown and door-closing button in the flood-prone factory building improves the timeliness and accuracy of emergency response by operation and maintenance personnel in the event of a flood-prone factory building.

[0066] Its core point is:

[0067] A flood-proof sensor is installed between every two units to control the shutdown and door closure of the adjacent units.

[0068] Multiple independent and redundant level switches and level transmitters.

[0069] The shutdown and door closing logic determines whether the water level is too high (select two out of three options), and blocks the high water level signal if the water level is too high.

[0070] The local cabinet of the analog LCU plant is equipped with a corresponding unit shutdown and door closing button.

[0071] The analog panel LCU and the unit LCU have independent and redundant command circuits for flooding, plant shutdown, and door closing.

[0072] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A strategy for a flood-proof powerhouse of a large hydroelectric generating unit, characterized in that: It includes the following steps: Step 1: Install a flood-proof liquid level sensor on the lowest floor of the factory building, i.e., the operating corridor floor. Step 2: When the water level is too high, the signal action selects two out of three to trigger the shutdown and gate closure of two adjacent units; Step 3: If the water level is too high, the system will shut down and the door will be closed based on the high water level signal. Step 4: Set the corresponding unit's emergency shutdown and door closing button for flooding in the LCU factory local cabinet; Step 5: The commands for stopping the plant and closing the doors in response to flooding are transmitted through two independent redundant channels: the simulation panel LCU and the unit LCU. Step 1-1: Install a set of flood-proof liquid level sensors between every two units in the plant operation corridor. Each set of sensors includes three sets of float-type liquid level switches and one float-type liquid level transmitter. Steps 1-2: Each set of float-type liquid level switches has a high water level and an excessively high water level switch contact. The three sets of float-type liquid level switches output 6 switching signals to the local cabinet of the analog panel LCU in the plant, namely, high water level 1, excessively high water level 1, high water level 2, excessively high water level 2, high water level 3, and excessively high water level 3. The analog panel LCU sends the above signals to the monitoring system. When the above signals are activated, the monitoring system's event overview table and screen will have corresponding alarms. Steps 1-3: The level transmitter outputs a 4~20mA analog signal to the local cabinet of the analog panel LCU in the factory, and the analog panel LCU sends this signal to the monitoring system. Steps 1-4: Set the upper limit and upper limit of the water level in the monitoring system database. When the analog water level signal output by the level transmitter is greater than the upper limit of the water level, the monitoring system event list and screen will report an alarm indicating that the water level exceeds the upper limit. When it is greater than the upper limit of the water level, an alarm will be reported indicating that the water level exceeds the upper limit.

2. The strategy for the flood-proof powerhouse of a giant hydroelectric generating unit according to claim 1, characterized in that Step 2 specifically includes: Step 2-1: The high water level and excessively high water level switch signals of the water level sensor in the flood-proof factory building are used in the logic judgment of stopping the machine and closing the door in the flood-proof factory building. The analog water level signal is only displayed on the monitoring system screen and does not participate in the control of stopping the machine and closing the door in the flood-proof factory building. Step 2-2: The PLC program of the simulation screen LCU performs a 3-to-2 logic judgment on the 3 high water level signals of each set. If any 2 of the 3 high water level signals are active, the set of flood prevention and flood control action instructions will be issued. Steps 2-3: The flood-proof plant door closing command will be sent to the two adjacent units to complete the shutdown and door closing control. That is, when the flood-proof plant operation is activated between the 1-2F units, a command will be issued to shut down the 1F unit and close the door, and the 2F unit will shut down and close the door.

3. The strategy for the prevention of the flooding of the powerhouse of a giant hydroelectric generating unit according to claim 1, characterized in that in Step 3 specifically includes: To prevent accidental activation of contacts due to excessively high water levels, which could lead to incorrect shutdown and door closing commands in the flood-prone factory, the PLC program of the analog panel LCU blocks the high water level signal when it is activated. In other words, the high water level and excessively high water level signals in the same group are only reliable when they are activated simultaneously, and only then do they participate in the shutdown and door closing logic judgment.

4. The strategy for the flood-proof powerhouse of a giant hydroelectric generating unit according to claim 1, characterized in that Step 4 specifically includes: Step 4-1: When the operation and maintenance personnel discover that a certain unit has an emergency situation of flooding of the plant, they press the flood-proof plant door closing button of the unit to trigger the unit's rapid shutdown process and quickly close the unit's water inlet quick door to prevent the flooding accident from occurring and escalating. Step 4-2: The PLC program of the simulation screen LCU is set with a reliable judgment logic for the button press of the flood-proof plant shutdown and door closing button. Only one unit will be running within a specified time to ensure that the flood-proof plant shutdown and door closing button is pressed. If multiple buttons are pressed at the same time, the shutdown and door closing command will not be output.

5. The strategy for the prevention of the flooding of the powerhouse of a giant hydroelectric generating unit according to claim 1, characterized in that in Step 5 specifically includes: Step 5-1: The simulation panel LCU has an independent remote cabinet at the water inlet. The local cabinet of the simulation panel LCU in the plant and the remote cabinet at the water inlet of the simulation panel LCU are connected by an independent optical cable, which is a completely different path from the unit LCU. Step 5-2: When the door closing button of a certain unit's flood-proof plant is pressed, the door closing control can be completed not only by sending a command to the unit's inlet fast door control system through the analog panel LCU, but also by sending the unit's LCU to the unit's inlet fast door control system.

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