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

Abstract

The invention 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 invention relates to the technical field of water conservancy and hydropower, and in particular to a flexible shutdown and flood-proof plant control system suitable for a giant pumped storage power station. Background Art

[0002] "Unmanned" and "few people on duty" in hydropower plants are a new type of operation and management mode for modern hydropower plants, and are one of the important signs of world-class hydropower companies. Hydropower stations generally operate in an "unmanned" control mode, and the operation and management of the power station are jointly undertaken by the centralized control center and the power station operation and maintenance department. The centralized control center is responsible for remote duty and monitoring, and the power station is responsible for on-site operation and emergency duty. Compared with conventional power stations, "unmanned" power stations have fewer patrol personnel, and cannot guarantee the first-time discovery and disposal of accidents. Hydropower plants must set up a flooded plant control system. When a flooded plant accident occurs, there must be an alarm and signal action to act on the unit for emergency shutdown, which can effectively protect personnel safety and improve production efficiency.

[0003] Giant hydropower stations have huge production capacity. If they are shut down by mistake, it will cause huge property losses. With the continuous improvement and perfection of the country's safety production standards, it is urgent to design an independent anti-flooding plant control system suitable for giant hydropower plants. It can effectively prevent accidental shutdowns and have functions such as flexible shutdown, closing of accident gates, sound and light, and alarms. It meets the latest standards, regulations, specifications and various requirements of the power grid for anti-flooding plant control systems. Summary of the invention

[0004] The main purpose of the present invention is to provide a flexible shutdown and flood prevention plant control system suitable for giant pumped storage power stations in response to the above-mentioned problems.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A flexible shutdown and flood-proof plant control system suitable for a giant pumped-storage power station, comprising a flood-proof plant control cabinet, a central control room emergency shutdown cabinet, a unit water machine protection cabinet, a unit LCU cabinet, a public LCU cabinet for an underground auxiliary plant, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system. The flood-proof plant control cabinet is respectively connected to the central control room emergency shutdown cabinet, each unit water machine protection cabinet, each unit LCU cabinet, each water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system through control cables. The flood-proof plant control cabinet performs RS485 communication with the public LCU cabinet for the underground auxiliary plant through an optical cable. The emergency stop button box is respectively connected to the public LCU cabinet for the underground auxiliary plant and the central control room emergency shutdown cabinet through control cables.

[0007] After the signal is analyzed and processed by the anti-flooding plant control cabinet, the anti-flooding plant control PLC directly issues a flooding plant signal to the unit LCU and unit water machine protection cabinet corresponding to the unit with abnormal water level signal, starts the emergency shutdown process, and issues an emergency door-dropping signal to the emergency shutdown cabinet in the central control room, drops the gate of the upstream pressure regulating shaft of the corresponding unit, and simultaneously issues an audible and visual alarm and a fire broadcast signal for the entire plant.

[0008] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0009] As a preferred technical solution of the present invention: the flood-proof plant control cabinet adopts a programmable logic controller (PLC).

[0010] As a preferred technical solution of the present invention: an AC 220V or DC 220V power surge protector is installed at the power inlet and outlet lines of the floodproof plant control cabinet.

[0011] As a preferred technical solution of the present invention: a switch power supply is provided on the floodproof plant control cabinet.

[0012] As a preferred technical solution of the present invention: the water level signal device adopts a float liquid level switch.

[0013] As a preferred technical solution of the present invention: the sound and light and alarm bell alarm devices are respectively arranged in the middle unit section of the power station's generator layer and in the central control room;

[0014] The sound and light alarm device for the generator layer is designed with a light-emitting device on the top of the control cabinet of the flood-proof plant, and two sound-emitting devices are set towards the first and last units;

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

[0016] As a preferred technical solution of the present invention: a protective cover is installed on the emergency stop button box, and each button has at least 4 pairs of normally open contacts.

[0017] As a preferred technical solution of the present invention: it also includes a control protection circuit for flood-proof plant. According to the control requirements for flood-proof plant, the four pairs of contacts of each flood-proof plant button are used as follows: two pairs of contacts are connected to the emergency shutdown screen in the central control room for relay expansion, and then connected to the input circuit of the remote control signal optical fiber transmission device of each unit to directly start the remote emergency closure of the upstream surge tank accident gate, connect to the LCU SOE input module of each unit to start the emergency shutdown process of each unit, and connect to the water machine protection screen of each unit to start the water machine protection emergency shutdown process of each unit;

[0018] 1 pair of contacts are connected to the flood-proof plant control cabinet to start the sound and light, alarm bell alarm and the emergency shutdown process of the unit LCU and water machine protection screen;

[0019] One pair of contacts is connected to the public LCU of the underground auxiliary plant, which is used for the monitoring system to record the signal source of the button action signal that starts the flooding of the plant.

[0020] As a preferred technical solution of the present invention: the control logic of the programmable controller (PLC) of the flood-proof plant control cabinet is:

[0021] The first group of water level signal devices (1SLX) outputs the signals of emergency shutdown of Units 1 and 2 and the emergency gates of the upstream surge wells 1 and 2 after “taking two out of three” and connecting in series with “high water level”;

[0022] The second group of water level signal devices (2SLX) outputs the signals of emergency shutdown of units 3 and 4 and the accident gates of upstream surge wells 3 and 4 after "taking two out of three" and connecting in series with "high water level"; the subsequent units are similar;

[0023] The "water level is too high" signal in the water level signal device of group 1 to group N / 2 directly enters the PLC switch input module in the control cabinet of the flood-proof plant, and the "water level high" signal enters the PLC switch input module in the control cabinet of the flood-proof plant after being expanded by the intermediate relay;

[0024] In order to prevent the power failure of the control circuit of the flooded plant, which would cause the PLC DO signal of the flooded plant to fail to be issued, the emergency door-dropping circuit of each unit, the water machine protection PLC lock, and the unit LCU lock are set respectively, so that the emergency stop signal of the flooded plant control cabinet can be issued normally when the control circuit power fails;

[0025] The anti-flooding plant signal reaches the anti-flooding plant control cabinet PLC, opens eight DO channels, connects in series the "high water level" relay contacts and locks them, and then connects them in parallel with the door-dropping button on the emergency stop screen in the central control room. Through the photoelectric converter, the switch signal is sent to the upstream pressure regulating well gate control cabinet to start the door-dropping; opens N DO channels, connects in series the "high water level" relay contacts and locks them, and then serves as the DI signal of the N water machine protection PLCs and starts the emergency accident shutdown process; opens N DO signals, connects in series the "high water level" relay contacts and locks them, and then serves as the SOE input signal of the N unit LCU and starts the emergency accident shutdown process.

[0026] As a preferred technical solution of the present invention: Design of output contact circuit for flood-proof plant signal:

[0027] DO opens N contacts, which are connected to the switch input modules of the LCUs of units 1 to N respectively, and the emergency shutdown process of the LCUs of the units is started;

[0028] DO opens N contacts, which are connected to the switch input modules of the water machine protection screens of units 1 to N respectively, and the emergency shutdown process of the water machine protection screens is started;

[0029] 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-dropping button circuits of units 1 to N to drop the accident gate of the upstream surge tank of the unit;

[0030] DO opens 4 contacts, which are connected to 2 sound and light alarm devices and alarm bell devices on the generator floor, the sound and light alarm devices and alarm bell devices in the central control room and the underground plant fire broadcast system (communication room).

[0031] The present invention provides a flexible shutdown and flood prevention plant control system suitable for giant pumped-storage power stations, which has the following beneficial effects: the present invention realizes flood prevention protection for the entire plant by setting up an independent set of flexible shutdown and flood prevention plant control systems, and adopts a set of water level signal devices to protect two units. The abnormal signal collected by the water level signal device is sent to the flood prevention plant control cabinet. After the signal is analyzed and processed by the flood prevention plant control cabinet, the flood prevention plant control PLC directly issues a shutdown and gate-drop signal for the faulty unit to the unit LCU, unit water machine protection cabinet and unit surge tank gate corresponding to the unit with abnormal signal, and simultaneously issues an audible and visual alarm device and a fire broadcast signal for the entire plant, thereby effectively avoiding the problem of false alarms and over-protection of the flood prevention plant leading to shutdown of the entire plant while ensuring compliance with the latest standards, regulations, specifications and various requirements of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a flexible shutdown and flood prevention plant control system applicable to a giant pumped storage power station provided by the present invention.

[0033] Figure 2 This is a schematic diagram of a flexible shutdown and flood prevention plant control system applicable to a giant pumped storage power station provided by the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-2As shown, a flexible shutdown and flood-proof plant control system suitable for a giant pumped-storage power station includes a flood-proof plant control cabinet, a central control room emergency shutdown cabinet, a unit water machine protection cabinet, a unit LCU cabinet, a public LCU cabinet for an underground auxiliary plant, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system. The flood-proof 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, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system through control cables. The flood-proof plant control cabinet communicates with the public LCU cabinet of the underground auxiliary plant through an optical cable through RS485, and the emergency stop button box is connected to the public LCU cabinet of the underground auxiliary plant and the central control room emergency shutdown cabinet through control cables.

[0036] After the signal is analyzed and processed by the anti-flooding plant control cabinet, the anti-flooding plant control PLC directly issues a flooding plant signal to the unit LCU and unit water machine protection cabinet corresponding to the unit with abnormal water level signal, starts the emergency shutdown process, and issues an emergency door-dropping signal to the emergency shutdown cabinet in the central control room, drops the gate of the upstream pressure regulating shaft of the corresponding unit, and simultaneously issues an audible and visual alarm and a fire broadcast signal for the entire plant.

[0037] Specifically, the flexible shutdown and flood prevention plant control system applicable to giant pumped storage power stations is implemented in the following manner:

[0038] Example 1

[0039] A flexible shutdown and flood-proof plant control system suitable for giant pumped-storage power stations comprises a flood-proof plant control cabinet, an emergency shutdown cabinet in a central control room, a unit water machine protection cabinet, a unit LCU cabinet, a public LCU cabinet for an underground auxiliary plant, a water level signal device, an audible and visual alarm device, an emergency stop button box, and a fire broadcast system. The invention is characterized in that the flood-proof plant control cabinet is connected to the emergency shutdown cabinet in the central control room, the water machine protection cabinets of each unit, the LCU cabinets of each unit, the water level signal devices, the audible and visual alarm device, the emergency stop button box, and the fire broadcast system through control cables, the flood-proof plant control cabinet is connected to the public LCU cabinet for the underground auxiliary plant through optical cables, and the emergency stop button box is connected to the public LCU cabinet for the underground auxiliary plant and the emergency shutdown cabinet in the central control room through control cables.

[0040] The flood-proof plant control cabinet uses serial communication to communicate with the public LCU cabinet in the underground auxiliary plant.

[0041] The floodproof plant control cabinet is arranged next to the unit in the middle of the main plant. The layout and wiring of the internal components and assemblies of the floodproof plant control cabinet and terminal box should be strictly carried out in accordance with the relevant national regulations and specifications. The layout and wiring of the components and assemblies should be beautiful and coordinated. Wiring must use wiring troughs. Effective shielding and isolation measures should be set between the strong and weak current circuits (including the introduction / exit terminal block part). Shielded wires should be used for wiring of weak current circuits, and the shielding layer should be reliably grounded.

[0042] The control cabinet of the floodproof factory building uses a programmable controller (PLC). Products from Schneider, Siemens or internationally renowned brands of equivalent quality should be selected, and the equipment must meet relevant national information security requirements.

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

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

[0045] The control unit should be intelligent and programmable. The control system should adopt a dual-machine hot standby hardware redundancy configuration scheme, that is, the two main processors (CPUs) should be installed on two independent frames respectively. Each main processor (CPU) rack should include a main processor module, a power module, and a communication module to ensure that it can automatically switch to the backup system under abnormal circumstances. The control system should support a multi-processor structure, adopt a fanless structure design, and support live plugging and unplugging. Each rack should have at least 1 to 2 spare slots, and the spare slots should have covers.

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

[0047] The control unit shall provide RS-485 serial communication interface and communication software for communicating with the public equipment LCU, using Modbus RTU communication protocol and optical cable connection.

[0048] The I / O modules used in the control unit should be able to withstand the environmental conditions of the hydropower plant, and each input / output point should be equipped with 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 influence of contact vibration. The digital input should receive dry contact DC signal. The voltage of the dry contact connected 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 working relay will automatically release after being energized for an adjustable time period under program control.

[0051] An AC 220V or DC 220V power surge protector is installed at the power input and output lines of the floodproof plant control cabinet. The surge protector must have CE certification and a test report for Safety Integrity Level 2 (SIL2—Safety Integrity Levels 2) certification provided by relevant agencies.

[0052] The control cabinet of the floodproof plant is equipped with a switching power supply. The switching power supply adopts Phoenix TRIO series, Weidmuller PROmax series, POWERONE or equivalent internationally renowned brand products. The local control cabinet is powered by AC / DC power supply. Any power failure and shutdown should not affect the normal operation of the local control unit. The capacity of the switching power supply should meet the load requirements and leave a certain margin.

[0053] A protective cover is installed on the emergency stop button box, and each button should have no less than 4 pairs of normally open contacts.

[0054] The water level signal device adopts a float level switch. The float level switch should be waterproof and oil-resistant. The protection level of the junction box should not be lower than IP65. The connecting cable should be oil-resistant and corrosion-resistant. The float level switch should be able to withstand a water pressure of not less than 1.0MPa. The float level switch is equipped with double floats, and no external power supply is required. Each pair of contacts can be provided. Two groups of normally open / normally closed are provided for selection. After the "high water level" signal or "too high water level" signal contact is actuated, the liquid level continues to rise or fall, and its 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 casing, and the level switch and the casing are connected by a flange.

[0055] Example 2

[0056] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and flood-proof plant control system suitable for giant pumped-storage power stations also includes a flood-proof plant PLC design. In order to further improve the independent hard-wired circuit of the flood-proof plant, a flood-proof plant PLC cabinet is arranged next to the machine in the middle section of the underground plant power generation layer. The CPU and power supply module are configured in a redundant manner. The flood-proof plant PLC cabinet adopts AC and DC dual-circuit power supply, and the PLC is not connected to the computer monitoring system network.

[0057] Example 3

[0058] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and flood prevention plant control system for giant pumped storage power stations also includes the design of a water level signal for the flooded plant. According to the structure and specification requirements of the underground plant of the hydropower station, a group of water level signal devices are installed at the bottom of the stairwell between the two units of the tailwater pipe layer. Each group of water level signal devices is equipped with 3 float liquid level switches, and the spacing between the float liquid level switches in the group is not less than 1m. Each float liquid level switch is set to two limit values, corresponding to the "high water level" signal (600mm from the ground) and the "too high water level" signal (800mm from the ground).

[0059] Example 4

[0060] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and anti-flooding plant control system for giant pumped storage power stations also includes a design of anti-flooding plant buttons. According to the design of the evacuation passage of the underground plant of the hydropower station, a set of anti-flooding plant button boxes are set on the wall on the downstream side on both sides of the underground plant power generation layer (the first unit and the last unit). Each button box is equipped with a button with a safety protection cover and a test handle ("working" and "testing" status). Only when the switch handle is in the "working" state, the button can be pressed to start the shutdown and door closing. The buttons configured in the button box are all anti-flooding plant buttons, which can stop all the units in the plant, and each button has 4 pairs of contacts.

[0061] Example 5

[0062] In this embodiment, based on the same concept as the above-mentioned embodiment 1, this flexible shutdown and flood-proof plant control system suitable for giant pumped-storage power stations also includes an independent sound and light, alarm bell alarm system design, and a set of sound and light alarm and alarm bell alarm devices dedicated to flooded plants are respectively set in the middle unit section of the generator layer of the power station and the central control room. The sound and light alarm device on the generator layer is placed on the top of the flood-proof plant control cabinet, and a light-emitting device is designed with a flashing function; two sound-emitting devices are set, facing the direction of the first unit and the last unit respectively. The sound and light alarm and the alarm bell alarm device are started and powered by the flood-proof plant control cabinet. The sound and light alarm device in the central control room is installed on the wall hanging on the side wall of the entrance, and the cable routing trough enters the cable channel under the floor.

[0063] Example 6

[0064] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and flood-proof plant control system for giant pumped storage power stations also includes a flood-proof plant control protection circuit. According to the flood-proof plant control requirements, the four pairs of contacts of each flood-proof plant button are used as follows: 2 pairs of contacts are connected to the emergency shutdown screen in the central control room for relay expansion, and then connected to the input circuit of the remote control signal optical fiber transmission device of each unit, which is used to directly start the remote emergency closure of the upstream surge tank accident gate, connect to the LCU SOE input module of each unit to start the emergency accident shutdown process of each unit, and connect to the water machine protection screen of each unit to start the water machine protection emergency accident shutdown process of each unit; 1 pair of contacts is connected to the flood-proof plant control cabinet to start the sound and light, alarm alarm and the emergency shutdown process of the unit LCU and the water machine protection screen; 1 pair of contacts is connected to the public LCU of the underground auxiliary plant, which is used for the monitoring system to record the signal source of the button action signal for starting the flooded plant.

[0065] Example 7

[0066] In this embodiment, based on the same concept as the above-mentioned embodiment 1, this flexible shutdown and flood prevention plant control system suitable for giant pumped storage power stations also includes flood prevention plant PLC action logic and control logic: the first group of water level signal devices (1SLX) outputs signals for emergency shutdown of units 1 and 2 and accident gates of upstream surge tanks 1 and 2 after "taking two out of three" and connecting in series with "high water level"; the second group of water level signal devices (2SLX) outputs signals for emergency shutdown of units 3 and 4 and accident gates of upstream surge tanks 3 and 4 after "taking two out of three" and connecting in series with "high water level"; the subsequent units are similar.

[0067] The "water level is too high" signal in the 1st to N / 2 groups of water level signal devices directly enters the PLC switch input module in the flood control cabinet of the waterproof plant, and the "water level is high" signal enters the PLC switch input module in the flood control cabinet of the waterproof plant after expansion through the intermediate relay.

[0068] In order to prevent the power supply of the control circuit of the flooded plant from being lost, which would cause the PLC DO signal of the flooded plant to be unable to be issued, the emergency door-dropping circuit lock of each unit, the water machine protection PLC lock, and the unit LCU lock are set respectively, so that the emergency stop signal of the flooded plant control cabinet can be issued normally when the control circuit power supply fails.

[0069] The anti-flooding plant signal reaches the anti-flooding plant control cabinet PLC, opens eight DO channels, connects in series the "high water level" relay contacts and locks them, and then connects them in parallel with the door-dropping button on the emergency stop screen in the central control room. Through the photoelectric converter, the switch signal is sent to the upstream pressure regulating well gate control cabinet to start the door-dropping; opens N DO channels, connects in series the "high water level" relay contacts and locks them, and then serves as the DI signal of the N water machine protection PLCs and starts the emergency accident shutdown process; opens N DO signals, connects in series the "high water level" relay contacts and locks them, and then serves as the SOE input signal of the N unit LCUs and starts the emergency accident shutdown process.

[0070] Example 8

[0071] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and flood prevention control system for giant pumped storage power stations also includes an output contact circuit design for flood prevention signal, where DO opens N contacts, which are respectively connected to the switch input modules of the LCUs of units 1 to N, and the emergency shutdown process of the LCUs of the units is started;

[0072] DO opens N contacts, which are respectively connected to the switch input modules of the water machine protection screens of units 1 to N, starting the emergency shutdown process of the water machine protection screens.

[0073] DO opens N contacts, which are connected to the emergency shutdown panel in the central control room and are connected in parallel with the emergency door-dropping button circuits of units 1 to N to drop the accident gate of the upstream regulating well of the unit.

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

[0075] Example 9

[0076] In this embodiment, based on the same concept as the above-mentioned embodiment 1, the flexible shutdown and flood prevention plant control system applicable to giant pumped storage power stations also includes cable selection and connection design, and the cable adopts flame-retardant Class A copper core cable. The design includes the following cables:

[0077] The DO of the waterproof plant control cabinet is opened to the water machine protection screen of each unit, with a total of N control cables; the DO of the waterproof plant control cabinet is opened to the LCU of each unit, with a total of N control cables; the DO of the waterproof plant control cabinet is opened to the emergency stop screen (spare as required by the specification) 1 and 2 in the central control room; the DO of the waterproof plant control cabinet is opened to the fire broadcast system and the sound and light in the central control room, a total of 2 control cables, to the sound and light and alarm devices 1 and 2 on the generator floor, which are the internal cables of the waterproof plant control cabinet.

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

[0079] The button boxes in the waterproof and flood-proof plant are respectively input to the waterproof and flood-proof plant control cabinet DI, with a total of 2 control cables; the button boxes in the waterproof and flood-proof plant are respectively input to the public LCU of the underground auxiliary plant, with a total of 2 control cables; the button boxes in the waterproof and flood-proof plant are respectively input to the emergency stop screens 1 and 2 in the central control room, with a total of 4 control cables.

[0080] One RS485 communication cable from the floodproof plant control cabinet to the public LCU cabinet in the underground auxiliary plant.

[0081] The flexible shutdown and flood prevention plant control system is used to protect the safe and stable operation of the power plant and prevent the whole plant from being shut down due to misjudgment of flood prevention plant signals. All equipment is regularly maintained by the power plant operation and maintenance personnel.

[0082] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A flexible shutdown and flood-proof plant control system suitable for giant pumped storage power stations, including a flood-proof plant control cabinet, an emergency shutdown cabinet in a central control room, a unit water machine protection cabinet, a unit LCU cabinet, a public LCU cabinet in an underground auxiliary plant, a water level signal device, an audible and visual alarm device, an emergency shutdown button box, and a fire broadcast system, characterized in that: The control cabinet of the floodproof plant is connected to the emergency stop cabinet in the central control room, the water machine protection cabinets of each unit, the LCU cabinets of each unit, the water level signal devices, the sound and light and alarm devices, the emergency stop button box and the fire broadcast system through control cables. The control cabinet of the floodproof plant communicates with the public LCU cabinet of the underground auxiliary plant through an optical cable. The emergency stop button box is connected to the public LCU cabinet of the underground auxiliary plant and the emergency stop cabinet in the central control room through control cables. After the signal is analyzed and processed by the anti-flooding plant control cabinet, the anti-flooding plant control PLC directly issues a flooding plant signal to the unit LCU and unit water machine protection cabinet corresponding to the unit with abnormal water level signal, starts the emergency shutdown process, and issues an emergency door-dropping signal to the emergency shutdown cabinet in the central control room, drops the gate of the upstream pressure regulating shaft of the corresponding unit, and simultaneously issues an audible and visual alarm and a fire broadcast signal for the entire plant.

2. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: The floodproof plant control cabinet adopts a programmable logic controller (PLC).

3. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: An AC 220V or DC 220V power surge protector is installed at the power inlet and outlet lines of the floodproof plant control cabinet.

4. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: The floodproof plant control cabinet is provided with a switch power supply.

5. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: The water level signal device adopts a float liquid level switch.

6. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: The sound and light and alarm bell alarm devices are respectively arranged in the middle unit section of the power station's generator layer and in the central control room; The sound and light alarm device for the generator layer is designed with a light-emitting device on the top of the control cabinet of the flood-proof plant, and two sound-emitting devices are set towards the first and last 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 prevention plant control system for giant pumped storage power stations according to claim 1 is characterized by: A protective cover is installed on the emergency stop button box, and each button has at least 4 pairs of normally open contacts.

8. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1 is characterized in that: It also includes a flood-proof plant control protection circuit. According to the flood-proof plant control requirements, the four pairs of contacts of each flood-proof plant button are used as follows: two pairs of contacts are connected to the emergency shutdown screen in the central control room for relay expansion, and then connected to the input circuit of the remote control signal optical fiber transmission device of each unit to directly start the remote emergency closure of the upstream surge tank accident gate, connect to the LCU SOE input module of each unit to start the emergency accident shutdown process of each unit, and connect to the water machine protection screen of each unit to start the water machine protection emergency shutdown process of each unit; 1 pair of contacts are connected to the flood-proof plant control cabinet to start the sound and light, alarm bell alarm and the emergency shutdown process of the unit LCU and water machine protection screen; One pair of contacts is connected to the public LCU of the underground auxiliary plant, which is used for the monitoring system to record the signal source of the button action signal that starts the flooding of the plant.

9. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 2 is characterized in that: The control logic of the programmable controller (PLC) of the flood-proof plant control cabinet is as follows: The first group of water level signal devices (1SLX) outputs the signals of emergency shutdown of Units 1 and 2 and the emergency gates of the upstream surge wells 1 and 2 after "taking two out of three" and connecting in series with "high water level"; The second group of water level signal devices (2SLX) outputs the signals of emergency shutdown of units 3 and 4 and the accident gates of upstream surge wells 3 and 4 after "two out of three" and series connection of "high water level"; the subsequent units are similar; The "water level is too high" signal in the 1st to N / 2nd group of water level signal devices directly enters the PLC switch input module in the flood control cabinet of the flood-proof plant, and the "water level is high" signal is expanded by the intermediate relay and enters the PLC switch input module in the flood control cabinet of the flood-proof plant; In order to prevent the power failure of the control circuit of the flooded plant, which would cause the PLC DO signal of the flooded plant to fail to be issued, the emergency door-dropping circuit of each unit, the water machine protection PLC lock, and the unit LCU lock are set respectively, so that the emergency stop signal of the flooded plant control cabinet can be issued normally when the control circuit power fails; The anti-flooding plant signal reaches the anti-flooding plant control cabinet PLC, opens eight DO channels, connects in series the "high water level" relay contacts and locks them in parallel with the door-dropping button on the emergency stop screen in the central control room, and sends the switch signal to the upstream regulating shaft gate control cabinet through the photoelectric converter to start the door-dropping; opens N DO channels, connects in series the "high water level" relay contacts and locks them, and uses them as the DI signal of the N water machine protection PLCs and starts the emergency accident shutdown process; opens N DO signals, connects in series the "high water level" relay contacts and locks them, and uses them as the SOE input signal of the N unit LCUs and starts the emergency accident shutdown process.

10. The flexible shutdown and flood prevention plant control system for giant pumped storage power stations according to claim 1, characterized in that: Design of output contact circuit for flood-proof plant signal: DO opens N contacts, which are connected to the switch input modules of the LCUs of units 1 to N respectively, and the emergency shutdown process of the LCUs of the units is started; DO opens N contacts, which are connected to the switch input modules of the water machine protection screens of units 1 to N respectively, and the emergency shutdown process of the water machine protection screens is started; 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-dropping button circuits of units 1 to N to drop the accident gate of the upstream surge tank of the unit; DO opens 4 contacts, which are connected to 2 sound and light alarm devices and alarm bell devices on the generator floor, the sound and light alarm devices and alarm bell devices in the central control room and the underground plant fire broadcast system (communication room).

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