Flexible shutdown anti-flooding plant control system suitable for giant pumped storage power station

Abstract

The utility model provides a flexible shutdown flood-proof plant control system suitable for a giant pumped storage power station. The flexible shutdown flood-proof plant control system comprises a flood-proof plant control cabinet, a central control room emergency shutdown cabinet, a unit water machine protection cabinet, a unit LCU cabinet, an underground auxiliary plant public LCU cabinet, a water level signal device, an acousto-optic and alarm bell alarm device, an emergency shutdown button box and a fire-fighting broadcasting system. A set of independent flexible shutdown flooding-proof plant control system is arranged, flooding-proof protection of the whole plant is achieved by adopting a set of water level signal devices to protect two units, abnormal signals collected by the water level signal devices are sent to a flooding-proof plant control cabinet, fault unit shutdown and gate falling signals are directly given out to the unit with abnormal signals, and the unit with the abnormal signals is controlled to stop and fall off. And meanwhile, a sound-light alarm device and a whole-plant fire-fighting broadcast signal are turned on.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy and hydropower technology field, concretely relates to a kind of flexible shutdown waterproof flooded plant control system suitable for giant pumped storage power station. BACKGROUND

[0002] The "unattended" and "few people on duty" of hydropower plant is a new operation and management mode of modern hydroelectric power plant, and is one of the important signs of international first-class hydropower enterprises. The hydropower station is generally operated according to the "unattended" control mode. The operation and management of the power station is jointly undertaken by the control center and the power station operation and maintenance department. The control center is responsible for remote duty and monitoring work, and the power station is responsible for on-site operation and emergency duty work. Compared with conventional power stations, the "unattended" power station has fewer patrol personnel, which cannot guarantee the timely discovery of accident points and disposal. Therefore, the hydropower plant must be equipped with a flooded plant control system. When a flooded plant accident occurs, an alarm and a signal action must be opened to act on the emergency shutdown of the unit, which can effectively protect the safety of personnel and improve production efficiency.

[0003] The capacity of giant hydropower stations is huge. If the unit is mistakenly stopped, it will cause huge property losses. With the continuous improvement and perfection of national safety production standards, it is urgent to design an independent waterproof flooded plant control system suitable for giant hydroelectric power plants. The system can effectively prevent misoperation, has the functions of flexible shutdown, closing of accident gates, sound and light, and alarm bell, and meets the requirements of relevant latest standards, regulations, specifications and power grid. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the utility model is to provide a flexible shutdown waterproof flooded plant control system suitable for giant pumped storage power stations to solve the above problems.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A flexible shutdown waterproof flooded plant control system suitable for giant pumped storage power stations, comprising a waterproof flooded plant control cabinet, an emergency shutdown cabinet in the central control room, a unit water turbine protection cabinet, a unit LCU cabinet, a public LCU cabinet in the underground auxiliary plant, a water level signal device, a sound and light alarm device, an emergency shutdown button box and a fire alarm system. The waterproof flooded plant control cabinet is connected with the emergency shutdown cabinet in the central control room, the unit water turbine protection cabinet, the unit LCU cabinet, the water level signal device, the sound and light alarm device, the emergency shutdown button box and the fire alarm system through control cables. The waterproof flooded plant control cabinet communicates with the public LCU cabinet in the underground auxiliary plant through optical cables. The emergency shutdown button box is connected with the public LCU cabinet in the underground auxiliary plant and the emergency shutdown cabinet in the central control room through control cables.

[0007] The signal is analyzed and processed by the waterproof flooded plant control cabinet, and the waterproof flooded plant control PLC directly sends out the waterproof flooded plant signal to the unit LCU corresponding to the unit with abnormal water level signal and the unit water machine protection cabinet, starts the emergency shutdown process, sends out the emergency door falling signal to the emergency shutdown cabinet in the central control room, falls the upstream surge tank gate of the corresponding unit, and simultaneously sends out the sound and light alarm device and the whole plant fire fighting broadcast signal.

[0008] While the above technical solutions are adopted, the utility model can also adopt or combine the following technical solutions:

[0009] As an optimal technical solution of the utility model: the waterproof flooded plant control cabinet adopts a programmable controller (PLC).

[0010] As an optimal technical solution of the utility model: an AC 220V or DC 220V power surge protection device is installed at the power input and output line of the waterproof flooded plant control cabinet.

[0011] As an optimal technical solution of the utility model: a switching power supply is arranged on the waterproof flooded plant control cabinet.

[0012] As an optimal technical solution of the utility model: the water level signal device adopts a floating ball liquid level switch.

[0013] As an optimal technical solution of the utility model: the sound and light alarm device and the alarm bell alarm device are respectively arranged in the middle unit section of the generator layer and the central control room of the power station.

[0014] The sound and light alarm device of the generator layer is designed with a light emitting device on the top of the waterproof flooded plant control cabinet, and two sound emitting devices are arranged towards the two units of the first unit and the last unit.

[0015] The sound and light alarm device of the central control room is arranged on the side wall of the entrance.

[0016] As an optimal technical solution of the utility model: a protective cover is installed on the emergency shutdown button box, and each button has at least 4 pairs of normally open contacts.

[0017] As an optimal technical solution of the utility model: it further comprises a waterproof flooded plant control protection circuit, and according to the waterproof flooded plant control requirements, the 4 pairs of contacts of each waterproof flooded plant button are used as follows: 2 pairs of contacts are connected to the emergency shutdown screen in the central control room after the relay is expanded, and then connected to the remote control signal optical fiber transmission device input circuit of each unit, directly starting the remote emergency closing of the upstream surge tank accident gate, connected to the LCU SOE input module of each unit for starting the emergency accident shutdown process of each unit, and connected to the water machine protection screen of each unit for starting the water machine protection emergency accident shutdown process of each unit.

[0018] 1 touch point is connected to the waterproof flooded plant control cabinet, and the emergency stop process of the sound and light, alarm bell, unit LCU and water machine protection screen is started;

[0019] 1 touch point is connected to the waterproof flooded plant control cabinet, and the emergency stop process of the sound and light, alarm bell, unit LCU and water machine protection screen is started;

[0020] As a preferred technical scheme of the utility model: the control logic of the waterproof flooded plant control cabinet programmable controller (PLC) is:

[0021] The first group of water level signal device (1SLX) is connected to the waterproof flooded plant control cabinet, and the emergency stop process of the sound and light, alarm bell, unit LCU and water machine protection screen is started;

[0022] The second group of water level signal device (2SLX) is connected to the waterproof flooded plant control cabinet, and the emergency stop process of the sound and light, alarm bell, unit LCU and water machine protection screen is started;

[0023] The first to N / 2 group of water level signal device is connected to the waterproof flooded plant control cabinet, and the emergency stop process of the sound and light, alarm bell, unit LCU and water machine protection screen is started;

[0024] In order to prevent the power failure of the water flooded plant control circuit, the emergency gate circuit locking of each unit, the water machine protection PLC locking and the unit LCU locking are set respectively, so that the emergency stop signal of the waterproof flooded plant control cabinet is normally opened under the condition of power failure of the control circuit.

[0025] The waterproof flooded plant signal reaches the waterproof flooded plant control cabinet PLC, and eight DO signals are opened and connected in series with the "water level high" relay contact locking, and then are connected in parallel with the emergency stop screen gate button in the central control room, so that the switch signal is sent to the upstream pressure well gate control cabinet to start the gate.

[0026] As a preferred technical scheme of the utility model: the output touch point circuit of the waterproof flooded plant signal is designed:

[0027] The DO opens N contacts, which are connected to the switching value input module of the 1 to N units LCU respectively, and the emergency accident stop process of the unit LCU is started;

[0028] DO opens N contacts, respectively connected to 1~N unit water machine protection screen switch value input module, start water machine protection screen emergency shutdown process;

[0029] DO opens N contacts, connected to the central control room emergency shutdown screen, and with 1~N unit emergency door button loop and the upstream pressure regulating well accident gate of the unit;

[0030] DO opens 4 contacts, connected to the generator layer 2 sound and light and alarm device, central control room sound and light and alarm device and underground powerhouse fire alarm system (communication room).

[0031] The utility model provides a kind of flexible shutdown waterproof plant control system suitable for giant pumped storage power station, with following beneficial effects: the utility model is protected by a set of flexible shutdown waterproof plant control system independently, realizes whole plant waterproof protection by the mode of a group of water level signal device protection two units, sends the abnormal signal collected by water level signal device to waterproof plant control cabinet, after signal is analyzed and handled by waterproof plant control cabinet, waterproof plant control PLC directly sends the machine group LCU, machine group water machine protection cabinet and machine group pressure regulating well gate corresponding to signal abnormal unit, falls gate signal, opens sound and light alarm device and whole plant fire alarm signal simultaneously, while ensuring to meet the latest standard, regulation, specification and each requirement of power grid, effectively avoid the problem that waterproof plant appears false alarm and overprotection leads to whole plant shutdown. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 The utility model provides the principle diagram of flexible shutdown waterproof plant control system suitable for giant pumped storage power station.

[0033] Fig. 2 The utility model provides the principle diagram of flexible shutdown waterproof plant control system suitable for giant pumped storage power station. DETAILED DESCRIPTION

[0034] The utility model is further described in detail with reference to drawing and specific embodiment.

[0035] As Figs. 1-2As shown, a flexible shutdown waterproof plant control system suitable for a giant pumped storage power station comprises a waterproof plant control cabinet, a central control room emergency shutdown cabinet, a unit water machine protection cabinet, a unit LCU cabinet, an underground auxiliary plant public LCU cabinet, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire alarm system. The waterproof plant control cabinet is connected to the central control room emergency shutdown cabinet, each unit water machine protection cabinet, each unit LCU cabinet, each water level signal device, the audible and visual alarm device, the emergency stop button box, and the fire alarm system through control cables. The waterproof plant control cabinet communicates with the underground auxiliary plant public LCU cabinet through optical cables. The emergency stop button box is connected to the underground auxiliary plant public LCU cabinet and the central control room emergency shutdown cabinet through control cables.

[0036] After the signals are analyzed and processed by the waterproof plant control cabinet, the waterproof plant control PLC directly sends a waterproof plant signal to the unit LCU corresponding to the unit with an abnormal water level signal and the unit water machine protection cabinet, starts an emergency shutdown process, sends an emergency gate closing signal to the central control room emergency shutdown cabinet, closes the upstream surge tank gate of the corresponding unit, and sends an audible and visual alarm signal and a full-plant fire alarm signal.

[0037] Specifically, the flexible shutdown waterproof plant control system suitable for a giant pumped storage power station is implemented in the following manner:

[0038] Embodiment 1

[0039] A flexible shutdown waterproof plant control system suitable for a giant pumped storage power station comprises a waterproof plant control cabinet, a central control room emergency shutdown cabinet, a unit water machine protection cabinet, a unit LCU cabinet, an underground auxiliary plant public LCU cabinet, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire alarm system. The waterproof plant control cabinet is connected to the central control room emergency shutdown cabinet, each unit water machine protection cabinet, each unit LCU cabinet, each water level signal device, the audible and visual alarm device, the emergency stop button box, and the fire alarm system through control cables. The waterproof plant control cabinet communicates with the underground auxiliary plant public LCU cabinet through optical cables. The emergency stop button box is connected to the underground auxiliary plant public LCU cabinet and the central control room emergency shutdown cabinet through control cables.

[0040] The waterproof plant control cabinet communicates with the underground auxiliary plant public LCU cabinet in a serial communication mode.

[0041] The waterproof control cabinet is arranged beside the unit in the middle of the main plant. The arrangement and wiring of the internal elements and components of the waterproof control cabinet and terminal box shall be strictly in accordance with the relevant regulations and specifications of the state. The arrangement and wiring of the elements and components shall be beautiful and harmonious. The wiring shall use wiring channels. Effective shielding and isolation measures shall be provided between the strong and weak current circuits (including the terminal block part of the incoming / outgoing terminal). The weak current circuit shall be wired using shielded wires, and the shielding layer shall be reliably grounded.

[0042] The waterproof control cabinet shall use programmable controllers (PLC) of Schneider, Siemens or other internationally renowned brands of equivalent quality. The equipment shall meet the relevant requirements of the state for information security.

[0043] The PLC shall meet the following technical conditions: the CPU controller shall be installed in a frame, the CPU template shall be redundantly configured, each rack shall have at least one Ethernet interface and one conventional communication interface for on-site debugging, the CPU template shall be a dual-core controller or an industrial reduced instruction set CPU, the word length shall not be less than 32 bits, the memory shall not be less than 16 MB, and the operation speed shall not be less than the following indicators: Boolean execution speed - 40Kinst / ms. For special-purpose controllers, the CPU controller shall be installed in a frame, the CPU template shall be redundantly configured, the CPU main frequency shall not be less than 384 MHz, the word length shall not be less than 32 bits, and the memory shall not be less than 64 MB.

[0044] The I / O module shall be configured with products of the same series as the main CPU, and the number of channels of all digital I / O modules shall not exceed 32 points.

[0045] The control unit shall have intelligence and programmable ability. The control system shall adopt a hardware redundancy configuration scheme with dual machine hot standby, i.e. two main processors (CPUs) shall be installed on two independent frames, each main processor (CPU) rack shall include a main processor module, a power module and a communication module to ensure automatic switching to the standby system in abnormal conditions. The control system shall support a multi-processor structure, adopt a fanless structure design and support hot swapping. Each rack shall have at least 1-2 spare slots, and the spare slots shall have covers.

[0046] The software shall be stored in a flash memory with sufficient capacity.

[0047] The control unit shall provide an RS-485 serial communication interface and communication software for communication with the utility device LCU, adopt the Modbus RTU communication protocol and use optical cables for connection.

[0048] The I / O module used by the control unit shall be able to withstand the environmental conditions of the hydropower plant, and each input / output point shall have a light-emitting diode indicator.

[0049] Each input of the digital input module should be optically isolated and filtered to ensure 500V insulation and reduce the effects of contact bounce. The digital input should accept dry contact DC signals, and the voltage of the dry contact to the loop is provided by the local control unit.

[0050] The digital output module should have electrically isolated relay output contacts, and the short-time operating relay is automatically released after a programmable control magnetization period.

[0051] A surge protector is installed at the AC 220V or DC 220V power supply inlet and outlet of the waterproof flooded plant control cabinet. The surge protector must have CE certification, and the surge protector must have a test report for Safety Integrity Level 2 (SIL2) certification provided by the relevant organization.

[0052] A switching power supply is provided on the waterproof flooded plant control cabinet. The switching power supply uses Phoenix TRIO series, Weidmuller PROmax series, POWERONE or equivalent internationally renowned brand products. The local control cabinet is powered by AC / DC power supply. If any power supply fails, it should not affect the normal operation of the local control unit. The capacity of the switching power supply should meet the load requirements and have a certain margin.

[0053] A protective cover is installed on the emergency stop button box. Each button should have at least 4 pairs of normally open contacts.

[0054] The water level signal device uses a floating ball liquid level switch. The floating ball liquid level switch should be waterproof and oil-resistant, with a protection level of not less than IP65. The connection cable should be oil-resistant and corrosion-resistant. The floating ball liquid level switch should be able to withstand a water pressure of not less than 1.0MPa. The floating ball liquid level switch is equipped with double floating balls and does not require an external power supply. Each pair of contacts can provide two groups of normally open / normally closed contacts for selection. After the "high water level" signal or "excessive high water level" signal contact acts, the liquid level continues to rise or fall, and the contact must continue to be maintained. The action point of the liquid level switch can be adjusted on site. The liquid level switch is installed in a DN100 stainless steel sleeve, and the liquid level switch and the sleeve are connected by a flange.

[0055] Example 2

[0056] In this embodiment, based on the same concept as in the above-mentioned embodiment 1, the flexible shutdown waterproof flooded plant control system suitable for a giant pumped storage power station further comprises a waterproof flooded plant PLC designed to further improve the independent hardwired circuit of the waterproof flooded plant. In the middle section of the power generation layer of the underground plant, a waterproof flooded plant PLC cabinet is provided beside the machine. The CPU and power supply module are configured in a redundant manner. The waterproof flooded plant PLC cabinet is powered by AC and DC dual circuits. The PLC is not connected to the computer monitoring system network.

[0057] Example 3

[0058] Based on the same concept as in Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes a design for a flood-resistant powerhouse water level signal device. According to the structure and specifications of the underground powerhouse, one set of water level signal devices is installed at the bottom of the stairwell between the two units in the tailrace layer. Each set of water level signal devices is equipped with three float level switches, with a spacing of no less than 1m between the float level switches within the set. Each float level switch is set with two limits, corresponding to a "high water level" signal (600mm above ground) and a "too high water level" signal (800mm above ground).

[0059] Example 4

[0060] Based on the same concept as Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes a flood-resistant powerhouse button design. According to the evacuation passage design of the underground powerhouse, one flood-resistant powerhouse button box is installed on each of the downstream walls on both sides of the power generation layer of the underground powerhouse (first unit and last unit). Each button box has one button with a safety guard and one test handle ("working" and "testing" states). Only when the handle is in the "working" state and the button is pressed can the shutdown and door closing be initiated. All buttons in the button box are flood-resistant powerhouse buttons, capable of stopping all units in the plant. Each button has four sets of contacts.

[0061] Example 5

[0062] Based on the same concept as Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes an independent audible and visual alarm system. One set of dedicated audible and visual alarms and one set of alarm bells for flood-resistant powerhouses are installed in the generator floor's intermediate unit section and the central control room, respectively. The generator floor audible and visual alarm is located on top of the flood-resistant powerhouse control cabinet and includes a flashing light device; two sound-emitting devices are also installed, one facing the first unit and the other the last unit. The audible and visual alarm and alarm bells are activated and powered by the flood-resistant powerhouse control cabinet. The central control room audible and visual alarm is mounted on the wall near the entrance, in a cable tray leading to the cable channel under the floor.

[0063] Example 6

[0064] Based on the same concept as Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes a flood-resistant powerhouse control and protection circuit. According to the flood-resistant powerhouse control requirements, the four sets of contacts of each flood-resistant powerhouse button are used as follows: two sets of contacts are connected to the emergency shutdown panel in the central control room for relay expansion, and then connected to the input circuit of the remote control signal fiber optic transmission device of each unit for directly starting the remote emergency closure of the upstream surge tank gate, connecting to the LCU SOE input module of each unit for starting the emergency shutdown process of each unit, and connecting to the turbine protection panel of each unit for starting the turbine protection emergency shutdown process of each unit; one set of contacts is connected to the flood-resistant powerhouse control cabinet input to start the audible and visual alarm, alarm bell alarm, and emergency shutdown process of the unit LCU and turbine protection panel; one set of contacts is connected to the common LCU of the underground auxiliary powerhouse for monitoring the signal source of the button action signal for starting the flood-resistant powerhouse.

[0065] Example 7

[0066] Based on the same concept as in Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes a flood-resistant powerhouse PLC action logic and control logic: The first group of water level signal devices (1SLX) outputs emergency shutdown signals for Units 1 and 2 and the emergency gates of the upstream surge tanks 1 and 2 after being converted from three to two and connected in series with "high water level"; The second group of water level signal devices (2SLX) outputs emergency shutdown signals for Units 3 and 4 and the emergency gates of the upstream surge tanks 3 and 4 after being converted from three to two and connected in series with "high water level"; the same applies to subsequent units.

[0067] In the first to N / 2 groups of water level signal devices, the "water level too high" signal goes directly into the PLC switch input module in the flood control plant control cabinet, while the "water level high" signal is extended by an intermediate relay before going into the PLC switch input module in the flood control plant control cabinet.

[0068] To prevent power failure in the control circuit of the flood-prone plant from causing the PLC DO signal to fail to be issued, emergency door closing circuit interlocks, water turbine protection PLC interlocks, and unit LCU interlocks are set up for each unit. This ensures that the emergency shutdown signal of the control cabinet of the flood-prone plant can be issued normally in the event of power failure in the control circuit.

[0069] The flood control signal reaches the flood control control cabinet PLC, which outputs eight DO signals and connects them in series with the "high water level" relay contacts for interlocking. These signals are then connected in parallel with the emergency stop panel door closing button in the central control room. The signal is transmitted to the upstream surge tank gate control cabinet via a photoelectric converter to initiate the door closing. N DO signals are also output and connected in series with the "high water level" relay contacts for interlocking. These signals serve as the DI signals for the protection PLCs of N water turbines and initiate the emergency shutdown procedure. Finally, N DO signals are output and connected in series with the "high water level" relay contacts for interlocking. These signals serve as the SOE input signals for the LCUs of N units and initiate the emergency shutdown procedure.

[0070] Example 8

[0071] Based on the same concept as in Embodiment 1 above, this flexible shutdown and flood-proof powerhouse control system for giant pumped storage power stations also includes an output contact circuit design for flood-proof powerhouse signals, where DO opens N contacts, which are respectively connected to the switch input modules of the LCU of units 1 to N, to initiate the emergency shutdown process of the unit LCU.

[0072] DO opens N contacts, which are respectively connected to the switch input modules of the water turbine protection panel of units 1 to N, to start the emergency shutdown procedure of the water turbine protection panel.

[0073] DO opens N contacts, which are connected to the emergency shutdown panel in the central control room and connected in parallel with the emergency door closing button circuit of units 1 to N, to close the emergency gate of the upstream pressure regulating well of the unit.

[0074] The DO opens 4 contacts, which are connected to 2 audible and visual alarm devices and alarm bells on the generator floor, the audible and visual alarm devices and alarm bells in the central control room, and the fire broadcast system (communication room) in the underground plant.

[0075] Example 9

[0076] Based on the same concept as Embodiment 1 above, this flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations also includes cable selection and connection design. The cables used are flame-retardant Class A copper core cables. The design includes the following cables:

[0077] The flood-resistant plant control cabinet has N control cables extending from its DO outlet to the water turbine protection panels of each unit; N control cables extending from its DO outlet to the LCUs of each unit; N control cables extending from its DO outlet to the emergency stop panels (spare as required by regulations) 1 and 2 in the central control room; and two control cables extending from its DO outlet to the fire broadcast system and the audible and visual alarms in the central control room, and to the audible and visual alarm devices 1 and 2 on the generator floor. These are internal cables of the flood-resistant plant control cabinet.

[0078] N / 2 groups of water level signal devices, a total of 3N / 2 float level switches, have their "water level too high" and "water level high" signals independently input to the DI circuit of the flood-proof plant control cabinet, with a total of 3N / 2 control cables.

[0079] The flood-proof factory button box has two control cables connected to the flood-proof factory control cabinet DI; the flood-proof factory button box has two control cables connected to the underground auxiliary factory common LCU; and the flood-proof factory button box has four control cables connected to the central control room emergency stop panels 1 and 2.

[0080] One RS485 communication cable connecting the flood-resistant factory control cabinet to the common LCU cabinet in the underground auxiliary factory.

[0081] The flexible shutdown and flood-resistant plant control system is used to protect the safe and stable operation of the power plant, prevent the plant from shutting down due to misinterpretation of flood-resistant plant signals, and ensure that each piece of equipment is regularly maintained by the power plant's operation and maintenance personnel.

[0082] The above specific embodiments are used to explain and illustrate the present utility model, and are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made to the present utility model within the spirit and protection scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A flexible shutdown and flood-resistant powerhouse control system suitable for giant pumped storage power stations, comprising a flood-resistant powerhouse control cabinet, a central control room emergency stop cabinet, a unit turbine protection cabinet, a unit LCU cabinet, a shared LCU cabinet for the underground auxiliary powerhouse, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system, characterized in that: The flood-resistant plant control cabinet is connected via control cables to the emergency stop cabinet in the central control room, the water turbine protection cabinets of each unit, the LCU cabinets of each unit, the water level signal devices, the audible and visual alarm devices, the emergency stop button box, and the fire broadcast system. The flood-resistant plant control cabinet communicates with the common LCU cabinet in the underground auxiliary plant via optical fiber using RS485. The emergency stop button box is connected via control cables to both the common LCU cabinet in the underground auxiliary plant and the emergency stop cabinet in the central control room. After the signal is analyzed and processed by the flood-proof plant control cabinet, the flood-proof plant control PLC directly sends a flood-proof plant signal to the unit LCU and unit water turbine protection cabinet corresponding to the unit with abnormal water level signal, initiates the emergency shutdown procedure, sends an emergency door closing signal to the emergency shutdown cabinet in the central control room, closes the upstream pressure regulating well gate of the corresponding unit, and simultaneously activates the audible and visual alarm device and the plant-wide fire broadcast signal.

2. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The flood-resistant factory control cabinet uses a programmable logic controller (PLC).

3. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The power input and output lines of the flood-proof factory control cabinet are equipped with AC 220 V or DC 220 V surge protectors.

4. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The control cabinet of the flood-resistant factory building is equipped with a switching power supply.

5. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The water level signal device uses a float level switch.

6. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The audible and visual alarm devices and the alarm bell are respectively installed in the intermediate unit section of the generator floor and the central control room of the power station; The generator floor sound and light alarm device has a light-emitting device on the top of the control cabinet of the flood-proof plant, and two sound-emitting devices are set up facing the first and last generator units. The sound and light alarm device in the central control room is installed on the side wall of the entrance.

7. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: The emergency stop button box is equipped with a protective cover, and each button has at least 4 pairs of normally open contacts.

8. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: It also includes a flood-proof plant control and protection circuit. According to the flood-proof plant control requirements, the four sets of contacts of each flood-proof plant button are used as follows: two sets of contacts are connected to the emergency stop panel in the central control room for relay expansion, and then connected to the input circuit of the remote control signal fiber optic transmission device of each unit to directly start the remote emergency shutdown of the upstream surge tank gate; two sets of contacts are connected to the LCU SOE input module of each unit to start the emergency shutdown process of each unit; and two sets of contacts are connected to the water turbine protection panel of each unit to start the water turbine protection emergency shutdown process of each unit. One set of contacts is connected to the flood-proof plant control cabinet to activate the audible and visual alarm, alarm bell, and emergency shutdown procedures for the unit LCU and water turbine protection panel; One set of contacts is connected to the common LCU in the underground auxiliary plant, which is used as the signal source for the monitoring system to record the button action signal when starting the flooded plant.

9. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 2, characterized in that: The control logic of the programmable logic controller (PLC) in the flood-resistant factory control cabinet is as follows: The first group of water level signal devices 1SLX outputs emergency shutdown signals for Units 1 and 2, and the emergency gates of upstream surge tanks 1 and 2, after being connected in series with "high water level" via a "three-out-of-two" method. The second group of water level signal devices, 2SLX, outputs emergency shutdown signals for Units 3 and 4, and the emergency gates of the upstream surge tanks 3 and 4, after being converted from three to two and connected in series with "high water level". The same applies to subsequent units. In the first to N / 2 groups of water level signal devices, the "water level too high" signal goes directly into the PLC switch input module in the flood control plant control cabinet, and the "water level high" signal is extended through an intermediate relay before going into the PLC switch input module in the flood control plant control cabinet. To prevent the PLC DO signal from failing to be output due to power failure in the control circuit of the flooded plant, emergency door closing circuit interlocks, water turbine protection PLC interlocks, and unit LCU interlocks are set up for each unit to ensure that the emergency stop signal of the control cabinet of the flooded plant can be output normally in the event of power failure in the control circuit. The flood control signal reaches the flood control control cabinet PLC, which outputs eight DO signals and connects them in series with the "high water level" relay contacts for interlocking. These signals are then connected in parallel with the door closing button on the emergency stop panel in the central control room. The signal is transmitted to the upstream surge tank gate control cabinet via a photoelectric converter to initiate the door closing. N DO signals are also output and connected in series with the "high water level" relay contacts for interlocking. These signals serve as the DI signals for the protection PLCs of N water turbines and initiate the emergency shutdown process. Additionally, N DO signals are output and connected in series with the "high water level" relay contacts for interlocking. These signals serve as the SOE input signals for the LCUs of N units and initiate the emergency shutdown process.

10. The flexible shutdown and flood-resistant powerhouse control system for giant pumped storage power stations according to claim 1, characterized in that: Design of output contact circuit for flood-resistant factory building signals: DO opens N contacts, which are respectively connected to the digital input modules of the LCU of units 1 to N to start the emergency shutdown procedure of the unit LCU; DO opens N contacts, which are respectively connected to the switch input modules of the water turbine protection panel of units 1 to N, to start the emergency shutdown procedure of the water turbine protection panel; DO opens N contacts, which are connected to the emergency shutdown panel in the central control room and connected in parallel with the emergency door closing button circuit of units 1 to N, to close the emergency gate of the upstream surge tank of the unit; The DO opens 4 contacts, which are connected to 2 audible and visual alarm devices on the generator floor, audible and visual alarm devices in the central control room, and the fire broadcast system in the underground plant.

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