Flexible shutdown anti-flooding plant control system suitable for giant hydraulic power plant

Abstract

The utility model discloses a flexible shutdown flood-proof plant control system suitable for a giant hydraulic power plant, and belongs to the technical field of hydraulic power plants. Comprising an anti-flooding plant control cabinet and equipment and accessories in the plant control cabinet, a central control room emergency shutdown cabinet and equipment and accessories in the plant control cabinet, a unit water machine protection cabinet and equipment and accessories in the unit water machine protection cabinet, a unit LCU cabinet and equipment and accessories in the unit LCU cabinet, an underground auxiliary plant public LCU cabinet and equipment and accessories in the underground auxiliary plant public LCU cabinet, a water level signal device and an acousto-optic and alarm bell alarm device. An emergency stop button box, a fire-fighting broadcasting system, a control cable and an optical cable. According to the utility model, a set of independent flexible shutdown flood-proof plant control system is arranged, flood-proof protection of the whole plant is realized in a manner that one group of water level signal devices is adopted to protect two units, and abnormal signals collected by the water level signal devices are sent to the flood-proof plant control cabinet; and fault unit shutdown and gate falling signals are directly given out to the unit with the abnormal signal, and meanwhile, a sound-light alarm device and a whole-plant fire-fighting broadcast signal are given out.

Description

Technical Field

[0001] The utility model relates to the technical field of hydropower plants, in particular to a plant building control system suitable for flexible shutdown and flood prevention of giant hydropower plants. Background Art

[0002] Unmanned operation of hydropower plants is a new operation and management mode of modern hydropower plants. It is one of the important signs of world-class hydropower enterprises. Hydropower stations generally operate in an "unmanned" control mode. 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, and there is an urgent need to design an independent anti-flooding plant control system suitable for giant hydropower plants, which can effectively prevent accidental shutdowns while having functions such as flexible shutdown, closing of emergency gates, sound and light, and alarms, and meet the latest standards, regulations, specifications and various requirements of the power grid for anti-flooding plant control systems. Utility Model Content

[0004] In order to improve the above-mentioned problem of giant hydroelectric power plants effectively avoiding false alarms caused by accidental shutdowns and flooding prevention of plant buildings, which may lead to shutdown of the entire plant, while complying with the latest standards, regulations, specifications and various requirements of the power grid, the utility model provides a flexible shutdown and flooding prevention plant building control system suitable for giant hydroelectric power plants.

[0005] The utility model provides a control system for flexible shutdown and flood prevention of giant hydropower plants, which adopts the following technical solutions:

[0006] A control system for flexible shutdown and flood prevention of giant hydropower plants, including a flood prevention plant control cabinet and equipment and accessories in the cabinet, a central control room emergency shutdown cabinet and equipment and accessories in the cabinet, a unit water machine protection cabinet and equipment and accessories in the cabinet, a unit LCU cabinet and equipment and accessories in the cabinet, a public LCU cabinet for underground auxiliary plants and equipment and accessories in the cabinet, a water level signal device, an audible and visual alarm device, an emergency stop button box, a fire broadcast system, a control cable and an optical cable, wherein the flood prevention 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, and the flood prevention plant control cabinet is connected to the public LCU cabinet for the underground auxiliary plant through an optical cable;

[0007] The emergency stop button box is connected to the public LCU cabinet of the underground auxiliary plant and the central control emergency stop cabinet through control cables.

[0008] Optionally, the flood-proof plant control cabinet communicates with the public LCU cabinet of the underground auxiliary plant using serial communication.

[0009] Optionally, the floodproof plant control cabinet is arranged next to the unit in the middle of the main plant.

[0010] Optionally, the flood-proof plant control cabinet adopts a programmable controller.

[0011] Optionally, an AC220V or DC 220V power surge protector is installed at the power input and output lines of the floodproof plant control cabinet.

[0012] Optionally, a switch power supply is provided on the floodproof plant control cabinet.

[0013] Optionally, 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.

[0014] Optionally, the water level signal device adopts a float liquid level switch.

[0015] In summary, the present invention has at least one of the following beneficial effects:

[0016] By setting up an independent set of flexible shutdown and flood prevention plant control systems, a set of water level signal devices is used to protect two units to achieve plant-wide flood protection. The abnormal signals collected by the water level signal device are 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 shutdown and gate closing signals to the unit LCU, unit water machine protection cabinet and unit surge tank gate corresponding to the unit with abnormal signals, and at the same time, it issues sound and light alarm devices and plant-wide fire broadcast signals. While ensuring compliance with the latest standards, regulations, specifications and various requirements of the power grid, it effectively avoids the problem of false alarms and over-protection in the flood prevention plant that lead to plant-wide shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The utility model provides a control system principle for flood-proofing plants in giant hydroelectric power plants. Figure 1;

[0019] Figure 2 The utility model provides a control system principle for flood-proofing plants in giant hydroelectric power plants. Figure 2 . DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-2 The utility model is described in further detail.

[0021] Embodiment 1, refer to Figure 1 and Figure 2 The utility model discloses a control system for a flexible shutdown and flood-proof plant for a giant hydropower plant, including a flood-proof plant control cabinet and its cabinet equipment and accessories, a central control room emergency shutdown cabinet and its cabinet equipment and accessories, a unit water machine protection cabinet and its cabinet equipment and accessories, a unit LCU cabinet and its cabinet equipment and accessories, an underground auxiliary plant public LCU cabinet and its cabinet equipment and accessories, a water level signal device, an audible and visual alarm device, an emergency stop button box, a fire broadcast system, a control cable and an optical cable. 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, and the flood-proof plant control cabinet is connected to the underground auxiliary plant public LCU cabinet through an optical cable. 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.

[0022] Reference Figure 1 The flood-proof plant control cabinet communicates with the public LCU cabinet of the underground auxiliary plant using serial communication.

[0023] Reference Figure 1 The waterproof and 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 waterproof and floodproof plant control cabinet and terminal box shall be strictly implemented in accordance with the relevant national regulations and specifications. The layout and wiring of the components and assemblies shall be beautiful and coordinated. Wiring must use wiring troughs. Effective shielding and isolation measures shall be set between the strong and weak current circuits (including the introduction / exit terminal block part). Shielded wires shall be used for wiring of weak current circuits, and the shielding layer shall be reliably grounded.

[0024] Reference Figure 1 The control cabinet of the floodproof plant shall use a programmable controller. PLC shall be made by Schneider, Siemens or other internationally renowned brands of equivalent quality. The equipment provided shall meet the relevant national information security requirements.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The software should be stored in a flash memory with sufficient capacity.

[0029] 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.

[0030] 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.

[0031] Each input of the digital input module shall be optically isolated and filtered to ensure 500V insulation and reduce the influence of contact vibration. The digital input shall accept dry contact DC signals. The voltage of the dry contact connected to the loop is provided by the local control unit.

[0032] The digital output module shall have electrically isolated relay output contacts. The short-time working relay shall be automatically released after being excited for an adjustable time under program control.

[0033] Reference Figure 1The power inlet and outlet of the floodproof plant control cabinet are equipped with an AC220V or DC220V power surge protector. The surge protector must have CE certification. The surge protector must have a test report for Safety Integrity Level 2 (SIL2—Safety Integrity Levels 2) certification provided by relevant agencies.

[0034] Reference Figure 1 The floodproof plant control cabinet is equipped with a switch power supply. The switch 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. If any power supply fails and stops running, it should not affect the normal operation of the local control unit. The capacity of the switch power supply should meet the load requirements and leave a certain margin.

[0035] Reference Figure 1 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.

[0036] Reference Figure 1 and Figure 2 , 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, and the connecting cable should be oil-resistant and corrosion-resistant cable; 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 a double float, no external power supply is required, and each pair of contacts can. 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 a flange is used to connect the liquid level switch and the casing.

[0037] Example 2, refer to Figure 1 and Figure 2 In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown of flood-proof plant buildings in giant hydropower plants also includes a flood-proof plant building PLC design. To further improve the independent hard-wired circuit of the flood-proof plant building, a flood-proof plant building PLC cabinet is set up next to the machine in the middle section of the underground plant power generation layer, and the CPU and power supply module are configured in a redundant manner. The flood-proof plant building PLC cabinet adopts AC and DC dual-circuit power supply, and the PLC is not connected to the computer monitoring system network.

[0038] Example 3, refer to Figure 1In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown of giant hydropower plants to prevent flooding also includes the design of a water level signal for flooded plants. 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 (200mm from the ground) and the "too high water level" signal (300mm from the ground).

[0039] Embodiment 4, referring to Figure 1 In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown and flood prevention of giant hydropower plants also includes a design of flood prevention buttons. According to the design of the evacuation passage of the underground powerhouse of the hydropower station, a set of flood prevention button boxes are set on the wall on the downstream side of the two sides of the underground powerhouse 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 flood prevention buttons, which can stop all the units in the plant, and each button has 4 pairs of contacts.

[0040] Example 5, refer to Figure 1 In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown of flood-proof plant buildings in giant hydropower plants also includes an independent sound and light and alarm bell alarm system design, and a set of sound and light alarm and alarm bell alarm devices dedicated to flood-proof plant buildings 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 control cabinet for flood-proof plant buildings, 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 building control cabinet. The sound and light alarm device in the central control room is set on the wall hanging on the side wall of the entrance, and the cable routing trough enters the cable channel under the floor.

[0041] Example 6, refer to Figure 1In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown of flood-proof plant buildings for giant hydropower plants also includes a flood-proof plant building control protection circuit. According to the flood-proof plant building control requirements, the four pairs of contacts of each flood-proof plant building 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 well 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 building 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 building, which is used for the monitoring system to record the signal source of the button action signal for starting the flooded plant building.

[0042] Embodiment 7, refer to Figure 1 and Figure 2 In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants also includes PLC action logic for flood prevention of plant buildings, 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.

[0043] 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.

[0044] The signal for preventing flooding in the plant reaches the PLC of the flooding control cabinet, eight DO channels are opened and connected in series with the "high water level" relay contacts, which are locked and connected in parallel with the door-dropping button on the emergency stop screen in the central control room. The switch signal is sent to the upstream regulating shaft gate control cabinet through the photoelectric converter to start the door-dropping; N DO channels are opened and connected in series with the "high water level" relay contacts, which are locked and used as the DI signal of the N water machine protection PLCs to start the emergency accident shutdown process; N DO signals are opened and connected in series with the "high water level" relay contacts, which are locked and used as the SOE input signal of the N unit LCUs to start the emergency accident shutdown process.

[0045] Embodiment 8, refer to Figure 1In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown of flood-proof powerhouses in giant hydropower plants 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 LCUs of units 1 to N, and the emergency shutdown process of the LCUs of the units is started;

[0046] 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.

[0047] 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.

[0048] 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).

[0049] Embodiment 9, refer to Figure 1 In this embodiment, based on the same concept as the above-mentioned embodiment 1, the control system for flexible shutdown and flood prevention of giant hydropower plants also includes cable selection and connection design, and the cable adopts flame-retardant Class A copper core cable. The design includes the following cables:

[0050] 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.

[0051] 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.

[0052] 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.

[0053] One RS485 communication cable from the floodproof plant control cabinet to the public LCU cabinet in the underground auxiliary plant.

[0054] 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. Each device is regularly maintained by the power plant operation and maintenance personnel.

[0055] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A control system for flexible shutdown and flood prevention of giant hydropower plants, including a flood prevention plant control cabinet and its equipment and accessories, a central control room emergency shutdown cabinet and its equipment and accessories, a unit water machine protection cabinet and its equipment and accessories, a unit LCU cabinet and its equipment and accessories, a public LCU cabinet for underground auxiliary plants and its equipment and accessories, a water level signal device, an audible and visual alarm device, an emergency stop button box, a fire broadcast system, a control cable and an optical cable, 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 cabinet of each unit, the LCU cabinet of each unit, each water level signal device, the sound and light and alarm device, the emergency stop button box and the fire broadcast system through control cables, and the control cabinet of the floodproof plant is connected to the public LCU cabinet of the underground auxiliary plant through optical cables; The emergency stop button box is connected to the public LCU cabinet in the underground auxiliary plant and the emergency stop cabinet in the central control room through control cables.

2. A control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants according to claim 1, characterized in that: The floodproof plant control cabinet communicates with the public LCU cabinet of the underground auxiliary plant by serial communication.

3. According to claim 1, a control system for flexible shutdown and flood prevention of giant hydropower plants, characterized in that: The floodproof plant control cabinet is arranged next to the unit in the middle of the main plant.

4. According to claim 1, a control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants, characterized in that: The flood-proof plant control cabinet adopts a programmable controller.

5. According to claim 1, a control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants, 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.

6. The control system for flexible shutdown and flood prevention of powerhouses in giant hydropower plants according to claim 1, characterized in that: The floodproof plant control cabinet is provided with a switch power supply.

7. The control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants according to claim 1, characterized in that: 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.

8. The control system for flexible shutdown and flood prevention of plant buildings in giant hydropower plants according to claim 1, characterized in that: The water level signal device adopts a float liquid level switch.

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