Flood prevention liquid level monitoring and backflow prevention integrated system for extra-high voltage converter station and monitoring method

Abstract

The invention discloses a flood prevention liquid level monitoring and backflow prevention integrated system for an extra-high voltage converter station and a monitoring method. The system comprises a water level sensing module, an independent isolation area which is arranged in the cable trench and is formed by the separation of a firewall, and a key area outside the cable trench. The communication module is connected with the water level sensing module and transmits the liquid level data in a wireless or wired mode; the data processing module receives the liquid level data of the communication module and generates an alarm signal based on a preset threshold value and dynamic trend analysis; the alarm module responds to the alarm signal of the data processing module and triggers sound-light alarm, and the monitoring background synchronously generates the alarm signal; and the anti-backflow module is used for blocking the water outlet. The water level sensing module covers an independent isolation area in the cable trench and a key area outside the cable trench to form a three-dimensional monitoring network, the layout is accurately monitored, an alarm is triggered according to the liquid level and the change rate, the anti-backflow module is electrically driven to quickly close a water outlet and block a backflow path, and closed-loop control from monitoring to protection is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of flood prevention in converter stations, and in particular to an integrated system and method for flood prevention liquid level monitoring and backflow prevention in ultra-high voltage converter stations. Background Art

[0002] As core power hub facilities, the safe operation of UHV converter stations is directly related to the stability of cross-regional power transmission. Because UHV projects are often located near rivers, heavy rainfall and flooding during the flood season pose a particular threat to the cable trenches and underground facilities within the stations.

[0003] Existing flood control technologies have significant flaws: Traditional water-level monitoring systems employ only single-point sensors at the entrance to the cable trench, failing to cover the hundreds of isolated zones separated by firewalls, resulting in delayed detection of water-level anomalies; manual inspections are inefficient and difficult to respond to sudden water surges; and backflow prevention measures often rely on passive protection such as sandbag blocking, which can easily fail under strong water pressure. Therefore, an integrated system combining intelligent sensing and active protection is urgently needed to achieve coordinated prevention and control of water levels across the entire cable trench in real time, intelligently analyze anomaly trends, and precisely block discharge outlets. Summary of the Invention

[0004] In order to solve the above-mentioned problems, the present invention provides an integrated system and monitoring method for flood control liquid level monitoring and backflow prevention in a UHV converter station.

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

[0006] The integrated system for flood control, liquid level monitoring, and backflow prevention in UHV converter stations includes: water level sensor modules, located in the independent isolation zone formed by firewalls within the cable trench and in key areas outside the cable trench, for real-time liquid level data collection;

[0007] The communication module is connected to the water level sensor module and transmits the liquid level data to the operation and maintenance personnel's monitoring background through wireless or wired means;

[0008] The data processing module receives the liquid level data from the communication module and generates an alarm signal based on the preset threshold and dynamic trend analysis;

[0009] The alarm module responds to the alarm signal of the data processing module, triggers the sound and light alarm, and the monitoring background generates an alarm signal synchronously;

[0010] The anti-backflow module is used to block the drainage outlet to prevent external water from flowing back into the converter station.

[0011] Furthermore, the layout of the water level sensor module in the cable trench meets the following conditions:

[0012] At least one water level sensor shall be installed in each independent isolation area separated by a firewall;

[0013] The distance between adjacent water level sensors shall not exceed 50% of the distance between firewalls.

[0014] Furthermore, the water level sensor is an ultrasonic liquid level meter, and a magnetic bracket is provided on the outside of the water level sensor. The water level sensor is arranged outside the cable trench and attached to the surface of the metal structure through a magnetic fixing seat. An electric control box is fixedly installed on the top of the water level sensor, and an alarm is fixedly installed on the top of the long pole outside the electric control box.

[0015] Furthermore, the key areas outside the cable trench include the low-lying areas of the UHV station area, the drainage outlet outside the UHV station, the valve cooling equipment room and the base of the control cabinet.

[0016] Furthermore, the data processing module performs the following operations:

[0017] Perform sliding average filtering and outlier removal on liquid level data;

[0018] Predict the trend of water accumulation in the next 10 minutes based on the neural network model;

[0019] An alarm is triggered when the real-time liquid level exceeds the threshold or the predicted trend slope is greater than the critical value.

[0020] Furthermore, the alarm module includes a three-level alarm mechanism:

[0021] Level 1 alarm: When the liquid level reaches the warning line and the rate of change is less than 5cm / min, the yellow indicator light is triggered;

[0022] Level 2 alarm: When the liquid level exceeds the warning line and the rate of change is ≥5cm / min, the red indicator light is triggered.

[0023] Furthermore, the backflow prevention module includes an installation frame fixedly arranged at the discharge port, a drain pipe is arranged on the inner side of the installation frame, a mounting hole is opened on the inner side of the drain pipe, a sealing ring is embedded on the inner side of the drain pipe, an blocking petal is arranged on the inner side of the sealing ring, a driving member is arranged on the outer side of the blocking petal, and one end of the driving member is movably arranged on the inner side of the mounting hole.

[0024] The flood control liquid level monitoring method of the integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station comprises the following steps:

[0025] S1. Deploy water level sensors in the independent isolation areas formed by firewalls within the cable trench and in key areas outside the cable trench to form a distributed monitoring network;

[0026] S2. Transmit the liquid level data collected by each sensor to the operation and maintenance personnel's monitoring background in real time through wireless or wired communication;

[0027] S3. Preprocess and analyze the received liquid level data and generate alarm instructions based on preset thresholds and dynamic trend predictions;

[0028] S4. According to the alarm command trigger multi-level alarm response, synchronous execution of sound and light alarm, monitoring background synchronous receiving warning signal;

[0029] S5. Determine whether it is necessary to operate the anti-backflow module according to the alarm instruction to prevent backflow due to excessively high liquid level.

[0030] Positive and beneficial effects of the present invention

[0031] 1. In the present invention, water level sensors are arranged in the cable trench at a distance not exceeding 50% of the distance between the firewalls to cover the independent isolation area; water level sensors are arranged in key areas outside the trench, including the low-lying area of ​​the UHV station area, the drainage outlet outside the UHV station, the valve cooling equipment room and the base of the control cabinet, to form a three-dimensional monitoring network and accurately monitor the layout.

[0032] The magnetic ultrasonic sensor is quickly mounted on metal surfaces and integrates power and communication modules to simplify deployment.

[0033] An adaptive sliding filter algorithm, combined with a window adjustment based on historical data fluctuations, suppresses noise while preserving trends. An LSTM neural network is used to predict water level trends, integrating a dual judgment mechanism that combines a static threshold with dynamic correction of rainfall intensity.

[0034] Alarms are triggered based on the liquid level and rate of change: the first-level early warning alerts risks, the second-level alarm is linked to the anti-backflow module, and the electrically driven blocking flaps quickly close the drain outlet, blocking the backflow path, achieving closed-loop control from monitoring to protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of the water level sensor of the present invention;

[0036] Figure 2 This is a structural diagram of the anti-backflow module of the present invention;

[0037] Figure 3 This is a partial structural diagram of the anti-backflow module of the present invention Figure 1 ;

[0038] Figure 4 This is a partial structural diagram of the anti-backflow module of the present invention Figure 2 ;

[0039] Figure 5 This is a partial structural diagram of the anti-backflow module of the present invention Figure 3 ;

[0040] Figure 6Schematic diagram of the integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to the present invention.

[0041] In the figure, 1. Magnetic bracket; 2. Water level sensor; 3. Electric control box; 4. Alarm; 5. Mounting frame; 6. Drain pipe; 7. Mounting hole; 8. Blocking petal; 9. Driving member; 10. Electric telescopic rod; 11. Sealing ring; 12-Folding rod, 121-First folding rod, 122-Second folding rod. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] See also Figure 1-6 An integrated system for flood control and backflow prevention at a UHV converter station includes: a water level sensor module, which is deployed in the independent isolation area formed by the firewall within the cable trench and in key areas outside the cable trench, such as the valve cooling equipment room and the UHV station outlet, for real-time liquid level data collection;

[0045] The communication module is connected to the water level sensor module and transmits the liquid level data to the operation and maintenance personnel monitoring background via wireless or wired means;

[0046] The data processing module receives the liquid level data from the communication module and generates an alarm signal based on the preset threshold and dynamic trend analysis;

[0047] The alarm module responds to the alarm signal of the data processing module, triggers the sound and light alarm, and the monitoring background generates an alarm signal synchronously;

[0048] The anti-backflow module is used to block the discharge outlet to prevent external water from flowing back into the converter station.

[0049] Specifically, the layout of the water level sensor module in the cable trench meets the following conditions:

[0050] At least one water level sensor shall be installed in each independent isolation area separated by a firewall;

[0051] The distance between adjacent water level sensors shall not exceed 50% of the distance between firewalls.

[0052] Specifically, the water level sensor is an ultrasonic liquid level meter. A magnetic bracket 1 is provided on the outside of the water level sensor 2. The water level sensor 2 is arranged outside the cable trench and attached to the surface of the metal structure through a magnetic fixing seat. An electric control box 3 is fixedly installed on the top of the water level sensor 2, and an alarm 4 is fixedly installed on the top of the long pole outside the electric control box 3.

[0053] In this embodiment, the magnetic bracket 1 is attached to the surface of the metal structure by the magnetic fixing base, and the water level sensor 2 is powered by the electrical control box 3, wherein the water level sensor module, communication module, data processing module, and alarm module are all arranged in the electrical control box 3, wherein the alarm module is electrically connected to the alarm 4, and the signal emitted by the alarm module is transmitted to the alarm 4, which serves as a warning.

[0054] Specifically, key areas outside the cable trench include the low-lying areas of the UHV station, the drainage outlet outside the UHV station, the valve cooling equipment room and the base of the control cabinet.

[0055] In this embodiment, the water level sensor 2 is installed in the low-lying area of ​​the UHV station, the drainage outlet outside the UHV station, the valve cooling equipment room and the base of the control cabinet in order to more accurately measure the water level in the local area, thereby realizing data collection and warning in the precise area.

[0056] Specifically, the data processing module performs the following operations:

[0057] Perform sliding average filtering and outlier removal on liquid level data;

[0058] Predict the trend of water accumulation in the next 10 minutes based on the neural network model;

[0059] An alarm is triggered when the real-time liquid level exceeds the threshold or the predicted trend slope is greater than the critical value.

[0060] In this implementation, the liquid level data of multiple consecutive sampling points are smoothed to eliminate short-term fluctuation interference (such as raindrop splashing and equipment vibration). The specific method of performing sliding average filtering on the liquid level data is as follows:

[0061] Dynamic window formula:

[0062] N=5+[0.2·δ pr ]

[0063] N: sliding window length (unit: number of data points);

[0064] δ pr : Standard deviation of the liquid level data in the previous period (usually 24 hours);

[0065] [·]: floor rounding function;

[0066] The window length is dynamically adjusted based on historical data fluctuations. When the water level fluctuates violently (large delta), the window is shortened (minimum N = 5) to improve response speed; when the water level is stable, the window is lengthened (maximum N = 15) to enhance the smoothing effect.

[0067] Weighted average formula:

[0068] ωk=1.5 -k ;

[0069] The current liquid level value after filtering, in cm;

[0070] x t-k : The original liquid level value at time tk;

[0071] ωk: Weight coefficient, which decays exponentially with the time distance of historical data.

[0072] The current moment data has the highest weight (ω0=1.5°=1), and the weight of historical data decays according to the negative exponential power of 1.5, which preserves the recent trend while suppressing noise;

[0073] Outlier removal formula:

[0074] Physical constraint formula:

[0075] Significance: Directly filters physically impossible values ​​that exceed the sensor range (0-18 cm), such as negative values ​​or over-range values ​​caused by sensor failure.

[0076] The neural network model uses a long short-term memory network (LSTM) to process time series data, which can capture the long-term dependencies of liquid level changes (such as the slow rise of water level before heavy rain and the drainage lag effect).

[0077] Liquid level exceeds threshold calculation:

[0078] Static threshold:

[0079] H baser =H maxr *60%

[0080] Dynamic trimming formula:

[0081] H d =H baser ×[1+0.05×max(R-30,0)]

[0082] Where R is the rainfall intensity. When R ≥ 30 mm / h, the threshold increases by 5% for every 10 mm increase.

[0083] Specifically, the alarm module includes a three-level alarm mechanism:

[0084] Level 1 alarm: When the liquid level reaches the warning line and the rate of change is less than 5cm / min, the yellow indicator light is triggered;

[0085] Level 2 alarm: When the liquid level exceeds the warning line and the rate of change is ≥5cm / min, the red indicator light is triggered.

[0086] In this implementation scheme, the alarm conditions are:

[0087]

[0088] H real : Liquid level after real-time filtering;

[0089] k: predicted slope.

[0090] Specifically, the backflow prevention module includes an installation frame 5 fixedly arranged at the discharge port, a drain pipe 6 is arranged on the inner side of the installation frame 5, a mounting hole 7 is opened on the inner side of the drain pipe 6, a sealing ring 11 is embedded on the inner side of the drain pipe 6, an intercepting flap 8 is movably arranged on the inner side of the sealing ring 11, a driving member 9 is arranged on the outer side of the intercepting flap 8, and one end of the driving member 9 is movably arranged on the inner side of the mounting hole 7.

[0091] In this embodiment, a backflow prevention module is provided to block the water flow outside the drain outlet. The backflow prevention treatment of the drain outlet is manually determined according to the alarm level. When the second alarm is reached, the driving member 9 is energized to control its telescopic state to drive the blocking flap 8 to expand or contract to achieve the opening and closing of the drain pipe 6. The driving member 9 includes an electric telescopic rod 10 and a folding rod 12. The folding rod 12 includes a first folding rod 121 and a second folding rod 122. The adjacent ends of the first folding rod 121 and the second folding rod 122 are rotatably connected. The other end of the first folding rod 121 is rotatably connected to the blocking flap 8, and the other end of the second folding rod 122 is rotatably connected to the mounting hole 7. One end of the electric telescopic rod 10 is rotatably connected to the first folding rod 121, and the other end is fixedly connected to the inner side of the drain pipe 6. The folding rod 12 is moved by driving the electric telescopic rod 10, thereby realizing the driving of the blocking flap 8 and controlling the opening and closing of the drain pipe 6. When the blocking flap 8 is completely closed, the backflow of the drain pipe 6 can be achieved.

[0092] The flood control liquid level monitoring method of the integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station comprises the following steps:

[0093] S1. Deploy water level sensors in the independent isolation areas formed by firewalls within the cable trench and in key areas outside the cable trench to form a distributed monitoring network;

[0094] S2. Transmit the liquid level data collected by each sensor to the operation and maintenance personnel's monitoring background in real time through wireless or wired communication;

[0095] S3. Preprocess and analyze the received liquid level data and generate alarm instructions based on preset thresholds and dynamic trend predictions;

[0096] S4. According to the alarm command trigger multi-level alarm response, synchronous execution of sound and light alarm, monitoring background synchronous receiving warning signal;

[0097] S5. Determine whether it is necessary to operate the anti-backflow module according to the alarm instruction to prevent backflow due to excessively high liquid level.

[0098] It should be noted that, in the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0099] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The integrated system for flood control liquid level monitoring and backflow prevention in UHV converter stations is characterized by: include: The water level sensor module is placed in the independent isolation area formed by the firewall in the cable trench and the key area outside the cable trench to collect liquid level data in real time; The communication module is connected to the water level sensor module and transmits the liquid level data to the operation and maintenance personnel's monitoring background through wireless or wired means; The data processing module receives the liquid level data from the communication module and generates an alarm signal based on the preset threshold and dynamic trend analysis; The alarm module responds to the alarm signal of the data processing module, triggers the sound and light alarm, and the monitoring background generates an alarm signal synchronously; The anti-backflow module is used to block the drainage outlet to prevent external water from flowing back into the converter station.

2. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 1 is characterized in that: The layout of the water level sensor module in the cable trench meets the following conditions: At least one water level sensor shall be installed in each independent isolation area separated by a firewall; The distance between adjacent water level sensors shall not exceed 50% of the distance between firewalls.

3. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 2 is characterized by: The water level sensor is an ultrasonic liquid level meter. A magnetic bracket is provided on the outside of the water level sensor. The water level sensor is arranged outside the cable trench and attached to the surface of the metal structure through a magnetic fixing seat. An electric control box is fixedly installed on the top of the water level sensor, and an alarm is fixedly installed on the top of the long pole outside the electric control box.

4. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 1 is characterized in that: The key areas outside the cable trench include the low-lying areas of the UHV station, the drainage outlet outside the UHV station, the valve cooling equipment room and the base of the control cabinet.

5. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 1 is characterized in that: The data processing module performs the following operations: Perform sliding average filtering and outlier removal on liquid level data; Predict the trend of water accumulation in the next 10 minutes based on the neural network model; An alarm is triggered when the real-time liquid level exceeds the threshold or the predicted trend slope is greater than the critical value.

6. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 5 is characterized by: The alarm module includes a three-level alarm mechanism: Level 1 alarm: When the liquid level reaches the warning line and the rate of change is less than 5cm / min, the yellow indicator light is triggered; Level 2 alarm: When the liquid level exceeds the warning line and the rate of change is ≥5cm / min, the red indicator light is triggered.

7. The integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to claim 1 is characterized in that: The backflow prevention module includes an installation frame fixedly arranged at the discharge port, a drain pipe is arranged on the inner side of the installation frame, a mounting hole is opened on the inner side of the drain pipe, a sealing ring is embedded in the inner side of the drain pipe, an blocking petal is arranged on the inner side of the sealing ring, a driving member is arranged on the outer side of the blocking petal, and one end of the driving member is movably arranged on the inner side of the mounting hole.

8. The flood control liquid level monitoring method applied to the integrated system for flood control liquid level monitoring and backflow prevention in a UHV converter station according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Deploy water level sensors in the independent isolation areas formed by firewalls within the cable trench and in key areas outside the cable trench to form a distributed monitoring network; S2. Transmit the liquid level data collected by each sensor to the operation and maintenance personnel's monitoring background in real time through wireless or wired communication; S3. Preprocess and analyze the received liquid level data and generate alarm instructions based on preset thresholds and dynamic trend predictions; S4. According to the alarm command trigger multi-level alarm response, synchronous execution of sound and light alarm, monitoring background synchronous receiving warning signal; S5. Determine whether it is necessary to operate the anti-backflow module according to the alarm instruction to prevent backflow due to excessively high liquid level.

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