A substation flood risk early warning system based on digital twin

Abstract

The present invention relates to a substation flood risk early warning system based on digital twin, including a risk assessment system and a data acquisition module installed in the monitored place, the risk assessment system includes a parameter setting module, a communication module, a risk assessment module and an early warning notification module connected in sequence, the data acquisition module includes a water level monitoring module and a rainfall monitoring module, and the communication module is respectively connected to the water level monitoring module, the rainfall monitoring module and the parameter setting module; the specific steps of using the monitoring system for early warning and monitoring include: 1. parameter setting, 2. data acquisition, 3. data interaction, 4. risk assessment, 5. early warning feedback. Compared with the prior art, the present invention has the advantages of high efficiency, accurate early warning, and safe use.

Description

Technical Field

[0001] The present invention relates to the technical field of water level warning for substations, and in particular to a substation flooding risk warning system based on digital twins. Background Art

[0002] When the rainy season comes, if the drainage of the cable trench of the substation is not smooth, it will often cause a lot of water accumulation, endangering the safety of electrical equipment and seriously affecting the reliable power supply. The main methods of flood warning at present are: manual warning method, and the operation staff on duty open the cover of the cable trench that is prone to water accumulation during the inspection to check whether there is water accumulation. The main problem of this method is that it is time-consuming, labor-intensive and cannot detect floods in time. There are the following risks and problems:

[0003] 1) Failure to promptly detect and remove accumulated water may result in reduced insulation of cables and other electrical equipment, leading to power outages and personal safety risks.

[0004] 2) The processing process is cumbersome, requires the cooperation of multiple people, takes up a lot of manpower and time, and has low work efficiency.

[0005] 3) To prevent the water pump from running dry and causing the motor coil to burn out, a dedicated person is required to monitor and control the start and stop of the water pump. At the same time, if the monitor fails to stop the pump in time due to negligence, the water pump still has the risk of running dry and burning out the coil. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art that it is time-consuming, labor-intensive and unable to timely detect substation cable trench flooding, and to provide a substation site flooding risk early warning system based on digital twins.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A substation flood risk early warning system based on digital twins, comprising a risk assessment system and a data acquisition module installed at a site to be monitored, wherein the risk assessment system comprises a parameter setting module, a communication module, a risk assessment module and an early warning notification module connected in sequence, the data acquisition module comprises a water level monitoring module and a rainfall monitoring module, and the communication module is respectively connected to the water level monitoring module, the rainfall monitoring module and the parameter setting module;

[0009] The water level monitoring module is used to obtain water level information;

[0010] The rainfall monitoring module is used to obtain rainfall information;

[0011] The parameter setting module is used to set the operating parameters of the water pump, the water level monitoring module and the rainfall monitoring module;

[0012] The communication module is used to transmit water level information, rainfall information and operating parameters in the parameter setting module to the risk assessment module;

[0013] The risk assessment module is used to simulate and calculate the water level rise speed, overflow risk and remaining time of water level exceeding the limit according to the water level information, rainfall information and the operating parameters in the parameter setting module;

[0014] The warning notification module is used to send warning information according to the output result of the risk assessment module.

[0015] Furthermore, the water level monitoring module includes a static pressure liquid level sensor and a first basic unit connected to each other, the rainfall monitoring module includes a rainfall sensor and a second basic unit connected to each other, the first basic unit and the second basic unit both include a lithium battery power supply module, an LED indicator light, a CPU and a Lora communication module, and the CPU is respectively connected to the lithium battery power supply module, the LED indicator light, the CPU and the Lora communication module.

[0016] Furthermore, the water level monitoring module converts the lithium battery voltage into a voltage that can be used by the CPU through the lithium battery power supply module, displays the communication status through the LED indicator light, collects the water level height data through the static pressure liquid level sensor, and converts it into a digital signal and transmits it to the communication module through the Lora communication module;

[0017] The rainfall monitoring module converts the lithium battery voltage into a voltage that can be used by the CPU through a lithium battery power supply module, displays the communication status through an LED indicator light, collects rainfall data through a rain sensor, converts it into a digital signal, and transmits it to the communication module through a Lora communication module.

[0018] Furthermore, during the simulation calculation process of the risk assessment module, a predicted water level height is calculated, and the water level rising speed, overflow risk and remaining time of water level exceeding the limit are calculated based on the predicted water level height.

[0019] Furthermore, the calculation expression of the water level prediction height is:

[0020] H 预测高度 =(H*SQ W +M*S) / S

[0021] Q W =(102*N*p) / (p*h)

[0022] In the formula, H is the real-time water level, S is the cross-sectional area of ​​the water tank, and Q Wis the water pumping volume, M is the real-time rainfall, N is the pump efficiency, P is the pump shaft power, p is the slurry weight, h is the pump head, H*S represents the volume of the current water level in the water tank, and H*S represents the volume of the water tank after rainfall;

[0023] The current liquid level in the tank is subtracted from the pumped volume plus the rainfall, and finally divided by the cross-sectional area of ​​the tank to obtain the predicted water level rise in the future.

[0024] Furthermore, the system calculates the water level change rate in real time at preset time intervals as the measurement period. When the water level information is not higher than the preset start value H1, the water pump starts and predicts the water level change based on the real-time water level height, water pumping volume and weather information. The warning time T2 is calculated according to Formula 1, and the water level full value time T0 is calculated according to Formula 2, thereby controlling the water pump.

[0025] Furthermore, the expression of Formula 1 is:

[0026]

[0027] Where H2 is the water level of the water tank corresponding to the warning time T2, i is the time, Q W is the water pumping capacity, T 预测 is the prediction time based on the time interval;

[0028] If the warning time T2 can be calculated by the formula 1, the water pumping capacity is increased, and a water level exceeding the limit remaining time warning is issued according to the warning time T2.

[0029] Furthermore, the expression of Formula 2 is:

[0030]

[0031] Where, T 预测 is the prediction time based on the time interval;

[0032] If the water level full value time T0 can be calculated by the formula 2, the water pumping capacity is increased, and an overflow risk warning is issued according to the water level full value time T0.

[0033] Furthermore, after the water pump is started, the change of the water level includes the following situations:

[0034] Case 1: The residual height of the water level increases, the amount of water pumped is greater than the rainfall, the amount of water in the tank decreases, and the water pump works;

[0035] Case 2: The remaining height of the water level remains unchanged, the rainfall and the amount of water pumped remain the same, the amount of water in the tank remains unchanged, and the pump works;

[0036] Case 3: The remaining height of the water level continues to decrease, and the amount of water in the tank increases; specifically, 1) the water pump is working, but the rainfall is greater than the amount of water pumped; 2) the water pump is not working, and the rainfall and water level change rates are consistent;

[0037] Determine whether the water pump is working based on the changes in water level.

[0038] Furthermore, the process of determining whether the water pump is working is as follows:

[0039] The water level change rate is calculated based on the acquired water level information. If the water level change rate is not less than 0, the water pump is working; otherwise, it is determined whether the difference between the absolute value of the water level change rate and the rainfall rate is equal to zero. If so, the water pump is working, otherwise the water pump is not working.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] (1) The method and system for early warning of substation flooding risk based on digital twin described in the present invention adopts a one-site-one-set-of-devices approach. Through the host computer server, each background data acquisition module can be numbered and the time interval for water level and rainfall sampling can be specified, thereby reducing the steps of modifying the program of each background data acquisition module separately, reflecting the efficiency and accuracy of the system.

[0042] (2) The present invention describes a method and system for early warning of substation flooding risks based on digital twins. The system monitors data in real time through an acquisition module and transmits data using Lora communication technology. The background system conducts risk assessment in a timely manner and can alert staff more flexibly. The advantages of low power consumption, wide coverage, large capacity, and low cost enable it to be widely used in a variety of vertical technologies, and is particularly suitable for communication scenarios for remote monitoring.

[0043] (3) The present invention discloses a method and system for early warning of flooding risks in a substation based on digital twins. The data acquisition module uses a self-powered lithium battery module, which avoids wiring at the bottom of the shaft, thereby effectively preventing safety accidents caused by leakage of electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a data acquisition module provided in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of a predicted water level change trend provided in an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of an early warning process of a monitoring system provided in an embodiment of the present invention;

[0047] Figure 4The present invention provides a monitoring system operation flow diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0052] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] Example 1

[0055] This embodiment provides a substation flood risk early warning system based on digital twins, where the places that need to be monitored for risk are connected to the monitoring system for early warning monitoring. The system includes a risk assessment system and a data acquisition module installed at the place to be monitored. The risk assessment system includes a parameter setting module, a communication module, a risk assessment module, and an early warning notification module connected in sequence. The data acquisition module includes a water level monitoring module and a rainfall monitoring module. The communication module is connected to the water level monitoring module, the rainfall monitoring module, and the parameter setting module respectively;

[0056] The water level monitoring module is used to obtain water level information;

[0057] The rainfall monitoring module is used to obtain rainfall information;

[0058] The parameter setting module is used to set the operating parameters of the water pump, water level monitoring module and rainfall monitoring module;

[0059] The communication module is used to transmit water level information, rainfall information and operating parameters in the parameter setting module to the risk assessment module;

[0060] The risk assessment module is used to simulate and calculate the water level rise speed, overflow risk and remaining time of water level exceeding the limit according to the water level information, rainfall information and operating parameters in the parameter setting module;

[0061] The early warning notification module is used to send early warning information based on the output results of the risk assessment module.

[0062] The specific steps of using the monitoring system for early warning and monitoring include:

[0063] 1. Parameter setting: Set the monitoring frequency, water level warning value, water pump self-start value, water pump specification information and other parameters in the parameter setting module of the monitoring system background. The system will bring the relevant parameters into the risk assessment module for calculation;

[0064] 2. Data collection: When the system receives the operation signal, it controls the start-up of the water level monitoring module and the rainfall monitoring module, and periodically records the water level and rainfall information.

[0065] 3. Data interaction: obtain the information monitored by the water level monitoring module and rainfall monitoring module based on Lora communication technology.

[0066] 4. Risk assessment: The relevant parameters obtained in steps 1 and 3, as well as the water level information and rainfall information, are brought into the risk assessment model to simulate and calculate the water level rise rate, overflow risk, and the remaining time of water level exceeding the limit.

[0067] 5. Early warning feedback: send relevant early warning information based on the evaluation results of step 4, including the speed of water level rise, overflow risk, remaining time of water level exceeding the limit, and whether the water pump is working normally.

[0068] By analyzing the actual situation of flooding in the indoor cable wells of this substation and the on-duty patrol mode, a real-time monitoring and early warning device is designed and installed on-site near the indoor cable wells where flooding often occurs: the monitoring device will start working, monitor the water level height and rainfall information in real time to predict the water level changes and water level overflow risks and overflow time in the future; when heavy rain occurs, when the water level rises to the set position, the water pump will be automatically started, and when the water level reaches the warning value, the alarm will be immediately sounded, and when the water level reaches the safe value, the water pump will be automatically shut down. The on-duty personnel can combine the daily patrol of power equipment to find the cable wells that have been flooded, so that other measures can be taken later to cure the problem.

[0069] As a preferred embodiment, the data acquisition module water level monitoring module is installed in the place to be monitored, including a lithium battery power supply module 1, an LED indicator 2, a CPU 3, a Lora communication module 4, and a static pressure liquid level sensor 5. The lithium battery module converts the lithium battery voltage into a voltage that can be used by the CPU. The LED indicator shows the communication status. The water level height data is collected by the sensor, converted into a digital signal, and sent to the background through the Lora communication technology. The structure is as follows: Figure 1 shown.

[0070] The data acquisition module rainfall monitoring module is installed in relevant places, including lithium battery power supply module 1, LED indicator light 2, CPU 3, Lora communication module 4, and rainfall sensor 5. The lithium battery module converts the lithium battery voltage into a voltage that can be used by the CPU. The LED indicator light displays the communication status. The rainfall data is collected through the sensor, converted into a digital signal, and sent to the background through the Lora communication technology.

[0071] As a preferred implementation, during the simulation calculation of the risk assessment module, a predicted water level height is calculated, and the water level rising speed, overflow risk and remaining time of water level exceeding the limit are calculated based on the predicted water level height.

[0072] The calculation expression of water level prediction height is:

[0073] H 预测高度 =(H*SQ W +M*S) / S

[0074] Q W =(102*N*p) / (p*h)

[0075] Where, H: real-time water level height (unit: m), S: cross-sectional area of ​​the water tank (unit: m 2 ), Qw: water pumping capacity (unit: m 3 / h), M: real-time rainfall (unit: mm), N: pump efficiency, P: pump shaft power, p: slurry weight (unit: kg / m 3 ), h: pump head (unit: m);

[0076] Where H*S represents the volume of the current water level in the tank, Q W It represents the amount of water pumped by the pump, M*S represents the volume of rainfall in the water tank, the current liquid level volume in the water tank minus the volume of water pumped by the pump plus the rainfall, and finally divided by the surface area of ​​the water tank to get the predicted water level rise in the future.

[0077] The monitoring principle is as follows: the monitoring system uses 1 minute as the measurement cycle to calculate the water level change rate in real time. When the water level monitoring signal value is less than or equal to the start value H1, the water pump starts, and the monitoring system begins to predict the water level change through the real-time water level height, water pumping volume and weather information. To calculate T2 and T0, the monitoring system needs to obtain continuous minute-level rainfall, and then accurately predict whether the water level will reach the warning value and the overall height of the water tank, such as Figure 2 shown.

[0078] The formula for calculating the warning time T2 is as follows:

[0079]

[0080] If T2 can be calculated from the above formula, it means that the water level will reach the warning value before the rain stops, and the water pump output needs to be increased, and a water level over-limit remaining time warning is issued based on the warning time T2; if T2 cannot be calculated from the above formula, it means that the water level will not reach the warning value before the rain stops.

[0081] The formula for calculating the water level full value time T0 is as follows:

[0082]

[0083] If T0 can be calculated from the above formula, it means that the water level will reach the overall height of the tank before the rain stops, and the water pump needs to be increased, and an overflow risk warning is issued based on the water level full value time T0; if T0 cannot be calculated from the above formula, it means that the water level will not reach the overall height before the rain stops.

[0084] This solution collects water level information and rainfall information through the water level monitoring module and rainfall monitoring module respectively to realize data calculation and simulation of the liquid level change state in the water tank, achieving the effect of digital twin, thereby realizing more accurate and reliable risk warning.

[0085] After the pump is started, the water level changes immediately and three situations occur:

[0086] Case 1: The residual height of the water level increases, the amount of water pumped is greater than the rainfall, the amount of water in the tank decreases, and the water pump works;

[0087] Case 2: The remaining height of the water level remains unchanged, the rainfall and the amount of water pumped remain the same, the amount of water in the tank remains unchanged, and the pump works;

[0088] Case 3: The remaining height of the water level continues to decrease, and the amount of water in the tank increases. It can be divided into the following two cases:

[0089] 1) The water pump works, but the rainfall is greater than the pumping capacity;

[0090] 2) The water pump is not working, and the rainfall and water level change rates are consistent.

[0091] After the water pump is started, the changes in monitoring signals and characterization values ​​of the above three situations are summarized in Table 1.

[0092] Table 1

[0093]

[0094] Among them, the current minute-level rainfall is obtained through the water level monitoring system to determine whether the water pump is working in the third case: if the value is 0, it means that the water level change in the tank is entirely due to the change in rainfall, and the water pump is not pumping water; if the value is not 0, it means that the water level change in the tank is affected by both rainfall and the water pump, and the water pump is pumping water.

[0095] The specific process of judging whether the water pump is working is as follows:

[0096] The water level change rate is calculated based on the acquired water level information. If the water level change rate is not less than 0, the water pump is working; otherwise, it is determined whether the difference between the absolute value of the water level change rate and the rainfall rate is equal to zero. If so, the water pump is working, otherwise the water pump is not working.

[0097] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A substation flood risk warning system based on digital twin, characterized in that: It includes a risk assessment system and a data acquisition module installed at a place to be monitored, wherein the risk assessment system includes a parameter setting module, a communication module, a risk assessment module and an early warning notification module connected in sequence, the data acquisition module includes a water level monitoring module and a rainfall monitoring module, and the communication module is respectively connected to the water level monitoring module, the rainfall monitoring module and the parameter setting module; The water level monitoring module is used to obtain water level information; The rainfall monitoring module is used to obtain rainfall information; The parameter setting module is used to set the operating parameters of the water pump, the water level monitoring module and the rainfall monitoring module; The communication module is used to transmit water level information, rainfall information and operating parameters in the parameter setting module to the risk assessment module; The risk assessment module is used to simulate and calculate the water level rise speed, overflow risk and remaining time of water level exceeding the limit according to the water level information, rainfall information and the operating parameters in the parameter setting module; The warning notification module is used to send warning information according to the output result of the risk assessment module; During the simulation calculation of the risk assessment module, a predicted water level height is calculated, and the water level rising speed, overflow risk and remaining time of water level exceeding the limit are calculated according to the predicted water level height; The calculation expression of the water level prediction height is: H 预测高度 =(H*S-Q W +M*S) / S Q W =(102*N*P) / (p*h) In the formula, H is the real-time water level, S is the cross-sectional area of ​​the water tank, and Q W is the water pumping volume, M is the real-time rainfall, N is the pump efficiency, P is the pump shaft power, p is the slurry weight, h is the pump head, H*S represents the volume of the current water level in the water tank, and M*S represents the volume of the water tank after rainfall; Subtract the volume of water pumped by the pump from the current liquid level in the tank plus the rainfall, and finally divide it by the cross-sectional area of ​​the tank to get the predicted water level rise in the future. The system uses a preset time interval as a measurement cycle to calculate the water level change rate in real time. When the water level information is not higher than the preset start value H1, the water pump starts, and predicts the water level change according to the real-time water level height, the water pumping volume and weather information. The warning time T2 is calculated according to Formula 1, and the water level full value time T0 is calculated according to Formula 2, so as to control the water pump. The expression of Formula 1 is: Where H2 is the water level of the water tank corresponding to the warning time T2, i is the time, Q W is the water pumping capacity, T 预测 is the prediction time based on the time interval; If the warning time T2 can be calculated by the formula 1, the water pumping capacity is increased, and a water level over-limit remaining time warning is issued according to the warning time T2; The expression of Formula 2 is: Where, T 预测 is the prediction time based on the time interval; If the water level full value time T0 can be calculated by the formula 2, the water pumping capacity is increased, and an overflow risk warning is issued according to the water level full value time T0.

2. According to claim 1, a substation flood risk warning system based on digital twins is characterized in that: The water level monitoring module includes a static pressure liquid level sensor and a first basic unit connected to each other, the rainfall monitoring module includes a rainfall sensor and a second basic unit connected to each other, the first basic unit and the second basic unit both include a lithium battery power supply module, an LED indicator light, a CPU and a Lora communication module, and the CPU is respectively connected to the lithium battery power supply module, the LED indicator light, the CPU and the Lora communication module.

3. According to claim 2, a substation flood risk warning system based on digital twins is characterized in that: The water level monitoring module converts the lithium battery voltage into a voltage that can be used by the CPU through the lithium battery power supply module, displays the communication status through the LED indicator light, collects water level height data through the static pressure liquid level sensor, and converts it into a digital signal and transmits it to the communication module through the Lora communication module; The rainfall monitoring module converts the lithium battery voltage into a voltage that can be used by the CPU through a lithium battery power supply module, displays the communication status through an LED indicator light, collects rainfall data through a rain sensor, converts it into a digital signal, and transmits it to the communication module through a Lora communication module.

4. According to claim 1, a substation flood risk warning system based on digital twins is characterized in that: After the water pump is started, the changes in the water level include the following: Case 1: The residual height of the water level increases, the amount of water pumped is greater than the rainfall, the amount of water in the tank decreases, and the water pump works; Case 2: The remaining height of the water level remains unchanged, the rainfall and the amount of water pumped remain the same, the amount of water in the tank remains unchanged, and the pump works; Case 3: The remaining height of the water level continues to decrease, and the amount of water in the tank increases; specifically, 1) the water pump is working, but the rainfall is greater than the amount of water pumped; 2) the water pump is not working, and the rainfall and water level change rates are consistent; Determine whether the water pump is working based on the changes in water level.

5. A substation flood risk warning system based on digital twin according to claim 4, characterized in that: The specific process of judging whether the water pump is working is as follows: The water level change rate is calculated based on the acquired water level information. If the water level change rate is not less than 0, the water pump is working; otherwise, it is determined whether the difference between the absolute value of the water level change rate and the rainfall rate is equal to zero. If so, the water pump is working, otherwise the water pump is not working.

Images