CN115597680A - Transformer substation site flooding risk early warning system based on digital twins - Google Patents

Abstract

The invention relates to a transformer substation site flooding risk early warning system based on digital twins, which comprises a risk evaluation system and a data acquisition module arranged in a site to be monitored, wherein the risk evaluation system comprises a parameter setting module, a communication module, a risk evaluation module and an early warning notification module which are sequentially connected, the data acquisition module comprises a water level monitoring module and a rainfall monitoring module, and the communication module is respectively connected with the water level monitoring module, the rainfall monitoring module and the parameter setting module; the specific steps of using the monitoring system to perform early warning and monitoring comprise: 1. parameter setting, 2, data acquisition, 3, data interaction, 4, risk assessment, 5 and early warning feedback. Compared with the prior art, the invention has the advantages of high efficiency, accurate early warning, safe use and the like.

Description

A digital twin-based flood risk early warning system for substation sites

technical field

The invention relates to the technical field of substation water level early warning, in particular to a digital twin-based substation flood risk early warning system.

Background technique

When the rainy season comes to the substation cable trench, once the drainage is not smooth, it will often cause a large amount of water, which will endanger the safety of electrical equipment and seriously affect the reliable power supply. The main method of present flood early warning is: artificial early warning method, and is opened easily waterlogging cable ditch cover plate by operation duty personnel in inspection, checks whether there is waterlogging. The main problem of this method is that it is time-consuming, laborious and unable to detect floods in time, and there are the following risks and problems:

1) The accumulation of water cannot be detected and removed in time, resulting in hidden dangers of insulation reduction in cables and other electrical equipment, which in turn causes equipment power outages and hidden dangers to personal safety.

2) The processing process is cumbersome and requires the cooperation of many people, which takes up a lot of manpower and time, and the work efficiency is low.

3) In order to prevent the water pump from running dry and causing the motor coil to burn out, special personnel are required to control the start and stop of the water pump. At the same time, if the pump is not stopped in time due to the negligence of the guards, the water pump still has the risk of burning out the coil due to dry pumping.

Contents of the invention

The purpose of the present invention is to provide a digital twin-based substation site flooding risk early warning system in order to overcome the defects of time-consuming, laborious and inability to detect substation cable trench flooding in the above-mentioned prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A digital twin-based substation site flooding risk early warning system, including a risk assessment system and a data acquisition module installed in the site to be monitored, the risk assessment system includes a parameter setting module, a communication module, and a risk assessment module connected in sequence Group and early warning notification module, 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, rainfall monitoring module and 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, water level monitoring module and 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 set the operating parameters in the module according to the water level information, rainfall information and parameters, and simulate and calculate the rising speed of the water level, the risk of overflow and the remaining time of the water level exceeding the limit;

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

Further, the water level monitoring module includes a hydrostatic liquid level sensor connected to each other and a first basic unit, and the rainfall monitoring module includes a rain sensor connected to each other and a second basic unit, and the first basic unit Both the base unit and the second basic unit 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.

Further, 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 The signal is then transmitted to the communication module through the Lora communication module;

The rainfall monitoring module converts the voltage of the lithium battery 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 rainfall data through the rainfall sensor, and converts it into a digital signal through the Lora communication module transmitted to the communication module.

Further, during the simulation calculation process of the risk assessment module, the predicted height of the water level is calculated, and the rising speed of the water level, the risk of overflow and the remaining time of the water level exceeding the limit are calculated according to the predicted height of the water level.

Further, the calculation expression of the predicted height of the water level is:

H _{predicted height} = (H*SQ _W +M*S)/S

Q _W ＝(102*N*p)/(p*h)

In the formula, H is the real-time water level height, S is the cross-sectional area of the tank, Q _W is the pumping volume of the pump, M is the real-time rainfall, N is the efficiency of the pump, P is the shaft power of the pump, p is the slurry weight, and h is the head of the pump , H*S represents the volume of the current water level of the tank, and H*S represents the capacity of rainfall to the tank;

Use the current liquid level volume in the tank to subtract the water pump pumping volume plus the rainfall, and finally divide by the cross-sectional area of the tank to obtain the predicted rise in the water level in the future.

Further, the system calculates the rate of change of the water level in real time with the preset time interval as the calculation cycle, and when the water level information is not higher _than the preset starting value H1, the water pump is started, and according to the real-time water level height, water pump pumping capacity and Weather information predicts water level changes, calculates early warning time T ₂ according to formula 1, and calculates water level full value time T ₀ according to formula 2, so as to control the water pump.

Further, the expression of the formula one is:

In the _formula , _H2 is the height of the tank water level corresponding to the early warning time T2, i is the moment, QW is the water pumping volume, and _{T prediction} is the prediction time based on the time interval;

If the early-warning time T ₂ can be calculated by the formula 1, the pumping capacity of the water pump is increased, and an early-warning of the remaining time of the water level exceeding the limit is issued according to the early-warning time T ₂ .

Further, the expression of the formula two is:

In the formula, T _prediction is the prediction time based on the time interval;

If the water level full value time T ₀ can be calculated by the formula 2, the pumping capacity of the water pump is increased, and an overflow risk warning is issued according to the water level full value time T ₀ .

Further, after the water pump is started, the change of the water level includes the following situations:

Situation 1: The remaining height of the water level increases, the pumping volume is greater than the rainfall, the water volume in the tank decreases, and the water pump works;

Situation 2: The remaining height of the water level remains unchanged, the rainfall and water pumping are equal, the water volume in the tank remains unchanged, and the water pump works;

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

According to the change of water level, judge whether the water pump is working.

Further, the process of judging whether the water pump is working is specifically as follows:

Calculate the water level change rate according to the obtained water level information. If the water level change rate is not lower than 0, the water pump is working; otherwise, judge 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 will not work.

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

(1) A digital twin-based substation site flooding risk early warning method and system according to the present invention adopts the mode of one set of devices in one site, and can number each background data acquisition module and specify water level, The time interval of rainfall sampling reduces the steps of modifying the program for each background data acquisition module separately, which reflects the efficiency and accuracy of the system.

(2) A digital twin-based substation site flooding risk early warning method and system according to the present invention can monitor data in real time through the acquisition module, use Lora communication technology to transmit data, and the background system can perform risk assessment in time, which can be more flexible. Staff alarm, its low power consumption, wide coverage, large capacity, low cost and other advantages, so that it can be widely used in a variety of vertical technologies, especially suitable for remote monitoring communication scenarios.

(3) In the digital twin-based substation flooding risk early warning method and system of the present invention, its data acquisition module uses a self-powered lithium battery module, which avoids the wiring at the bottom of the well, thereby effectively preventing electric leakage safety accidents .

Description of drawings

Fig. 1 is a schematic structural diagram of a data acquisition module provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a predicted water level change trend provided in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a monitoring system early warning process provided in an embodiment of the present invention;

Fig. 4 is a schematic diagram of the operation flow of a monitoring system provided in an embodiment of the present invention.

detailed description

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 It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

Example 1

This embodiment provides a digital twin-based substation site flood risk early warning system, which connects sites that require risk monitoring to the monitoring system for early warning monitoring. The system includes a risk assessment system and a data acquisition module installed in the site to be monitored. The evaluation 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 respectively connected to the water level monitoring module, Rainfall monitoring module and 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, water level monitoring module and rainfall monitoring module;

The communication module is used to transmit the 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 set the operating parameters in the module according to the water level information, rainfall information and parameters, and simulate and calculate the rising speed of the water level, the risk of overflow and the remaining time of the water level exceeding the limit;

The early warning notification module is used to send early warning information according to the output results of the risk assessment module.

The specific steps to use the monitoring system for early warning and monitoring include:

1. Parameter setting, set the monitoring frequency, water level warning value, water pump self-starting value, water pump specification information and other parameters in the background parameter setting module of the monitoring system, and the system will bring the relevant parameters into the risk assessment module for calculation;

2. Data collection. When the system receives the operation signal, it controls to start the water level monitoring module and the rainfall monitoring module, and periodically records the water level height and rainfall information.

3. Data interaction, according to the Lora communication technology to obtain the information monitored by the water level monitoring module and the rainfall monitoring module.

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

5. Early warning feedback, send relevant early warning information according to 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.

By analyzing the actual situation of the substation's indoor cable well flooding and on-duty inspection methods, a real-time monitoring and early warning device is designed and installed near the indoor cable well where flooding often occurs: the monitoring device will start to work and monitor the water level in real time Predict the change of water level, the risk of water level overflow and the time of overflow in a certain period of time in the future; when the rainstorm occurs, when the water level rises to the set position, the water pump will be automatically started, and the alarm will be given immediately when the water level reaches the warning value; when the water level reaches the safe value , the water pump is automatically turned off. The duty officer can combine the daily inspection of the power equipment to find the cable wells that have been flooded, so that other measures can be taken to cure them later.

As a preferred embodiment, the water level monitoring module of the data acquisition module is installed in the place to be monitored, including a lithium battery power supply module 1, an LED indicator light 2, a CPU 3, a Lora communication module 4, and a static pressure liquid level sensor 5. The lithium battery voltage is converted into a voltage that can be used by the CPU through the lithium battery module. The communication status is displayed by LED indicators. Collect water level data through sensors, convert water level data into digital signals, and send them to the background through Lora communication technology. The structure is shown in Figure 1.

Data acquisition module The rainfall monitoring module is installed in relevant places, including a lithium battery power supply module 1, an LED indicator light 2, a CPU 3, a Lora communication module 4, and a rain sensor 5. The lithium battery voltage is converted into a voltage that can be used by the CPU through the lithium battery module. The communication status is displayed by LED indicators. Collect rainfall data through sensors, convert rainfall data into digital signals, and send them to the background through Lora communication technology.

As a preferred implementation, the risk assessment module calculates the predicted height of the water level during the simulation calculation process, and calculates the rising speed of the water level, the risk of overflow and the remaining time of the water level exceeding the limit according to the predicted height of the water level.

The calculation expression of the predicted height of water level is:

H _{predicted height} = (H*SQ _W +M*S)/S

Q _W ＝(102*N*p)/(p*h)

In the formula, H: real-time water level height (unit: m), S: cross-sectional area of water tank (unit: m ² ), Qw: water pumping volume (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);

Among them, H*S represents the volume of the current water level of the tank, Q _W represents the pumping volume of the water pump, and M*S represents the capacity of the rainfall to the tank, and the current liquid level volume in the tank is subtracted from the water volume of the pump plus the rainfall. Finally, divide by the surface area of the tank to get the predicted rise in water level for some time in the future.

The monitoring principle of the system is as follows: the monitoring system calculates the rate of water level change in real time with 1 minute as the calculation cycle. When the water level monitoring signal value is less _than or equal to the starting value H1, the water pump starts, and the monitoring system starts to predict the water level change through real-time water level height, water pumping volume and weather information. _The calculation of T2 and _T0 requires the use of the monitoring system 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 tank, as shown in Figure 2.

Among them, the _formula for calculating the warning time T2 is as follows:

If T ₂ can be calculated from the above formula, it means that the water level will reach the warning value before the rain stops, and the pumping volume of the water pump needs to be increased, and an early warning of the remaining time of the water level exceeding the limit will be issued according to the warning time T ₂ ; if it cannot be calculated from the above formula T ₂ means that the water level will not reach the warning value before the rain stops.

The formula for calculating the full water level time T ₀ is as follows:

If T ₀ 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 pumping capacity of the water pump needs to be increased, and an overflow risk warning will be issued according to the time T ₀ when the water level is full; if it cannot be calculated from the above formula T ₀ means that the water level will not reach the overall height before the rain stops.

This solution collects water level information and rainfall information respectively through the water level monitoring module and the rainfall monitoring module to realize the data calculation and simulation of the liquid level change state in the tank, and achieve the effect of digital twins, thereby realizing more accurate and reliable Risk Warning.

When the water level changes immediately after the pump is started, three situations will occur:

Situation 1: The remaining height of the water level increases, the pumping volume is greater than the rainfall, the water volume in the tank decreases, and the water pump works;

Situation 2: The remaining height of the water level remains unchanged, the rainfall and water pumping are equal, the water volume in the tank remains unchanged, and the water pump works;

Situation 3: The remaining height of the water level continues to decrease, and the water volume in the tank increases, which can be divided into the following two situations:

1) The water pump works, but the rainfall is greater than the water pumped;

2) The water pump is not working, and the rate of change of rainfall and water level is consistent.

After the water pump is started, the monitoring signals and characteristic value changes of the above three types of situations are summarized in Table 1 below.

Table 1

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

The process of judging whether the water pump is working is as follows:

Calculate the water level change rate according to the obtained water level information. If the water level change rate is not lower than 0, the water pump is working; otherwise, judge 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 will not work.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (10)

1. A substation site flood risk early warning system based on digital twins, characterized in that it includes a risk assessment system and a data acquisition module installed at the site to be monitored, and the risk assessment system includes sequentially connected parameter setting modules, communication module, a risk assessment module and an early warning notification module, 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, water level monitoring module and 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 set the operating parameters in the module according to the water level information, rainfall information and parameters, and simulate and calculate the rising speed of the water level, the risk of overflow and the remaining time of the water level exceeding the limit; The early warning notification module is used to send early warning information according to the output result of the risk assessment module. 2. A digital twin-based substation site flooding risk early warning system according to claim 1, wherein the water level monitoring module includes a hydrostatic liquid level sensor and a first basic unit connected to each other, the The rainfall monitoring module includes an interconnected rain sensor and a second basic unit, 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 CPUs are respectively Connect the lithium battery power supply module, LED indicator, CPU and Lora communication module. 3. A digital twin-based substation site flooding risk early warning system according to claim 2, wherein the water level monitoring module converts the lithium battery voltage into a voltage that can be used by the CPU through a lithium battery power supply module, The communication status is displayed through the LED indicator light, and the water level height data is collected through the static pressure liquid level sensor, and converted into a digital signal, and then transmitted to the communication module through the Lora communication module; The rainfall monitoring module converts the voltage of the lithium battery 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 rainfall data through the rainfall sensor, and converts it into a digital signal through the Lora communication module transmitted to the communication module. 4. A digital twin-based substation site flooding risk early warning system according to claim 1, wherein the risk assessment module calculates a water level prediction height during the simulation calculation process, and according to the water level prediction The altitude calculates the rate of rise of the water level, the risk of overflow, and the time remaining for the water level to exceed the limit. 5. A kind of substation site flood risk early warning system based on digital twin according to claim 4, is characterized in that, the calculation expression of described water level prediction height is: H _{predicted height} = (H*SQ _W +M*S)/S Q _W ＝(102*N*P)/(p*h) In the formula, H is the real-time water level height, S is the cross-sectional area of the tank, Q _W is the pumping volume of the pump, M is the real-time rainfall, N is the efficiency of the pump, P is the shaft power of the pump, p is the slurry weight, and h is the head of the pump , H*S represents the volume of the current water level of the tank, M*S represents the capacity of rainfall to the tank; Use the current liquid level volume in the tank to subtract the water pump pumping volume plus the rainfall, and finally divide by the cross-sectional area of the tank to obtain the predicted rise in the water level in the future. 6. A digital twin-based substation site flooding risk early warning system according to claim 4, characterized in that, the system calculates the rate of change of water level in real time with the preset time interval as the calculation cycle, and when the water level information does not When it is higher than the preset starting value H ₁ , the water pump starts, and the water level change is predicted according to the real-time water level height, water pumping volume and weather information, the early warning time T ₂ is calculated according to formula 1, and the full water level time T ₀ is calculated according to formula 2 , so as to control the water pump. 7. A kind of substation site flood risk early warning system based on digital twin according to claim 6, is characterized in that, the expression of described formula one is:

In the _formula , _H2 is the height of the tank water level corresponding to the early warning time T2, i is the moment, QW is the water pumping volume, and _{T prediction} is the prediction time based on the time interval; If the early-warning time T ₂ can be calculated by the formula 1, the pumping capacity of the water pump is increased, and an early-warning of the remaining time of the water level exceeding the limit is issued according to the early-warning time T ₂ . 8. A kind of digital twin-based substation site flood risk early warning system according to claim 6, characterized in that, the expression of said formula two is:

In the formula, T _prediction is the prediction time based on the time interval; If the water level full value time T ₀ can be calculated by the formula 2, the pumping capacity of the water pump is increased, and an overflow risk warning is issued according to the water level full value time T ₀ . 9. A digital twin-based substation site flooding risk early warning system according to claim 1, characterized in that, after the water pump is started, changes in the water level include the following situations: Situation 1: The remaining height of the water level increases, the pumping volume is greater than the rainfall, the water volume in the tank decreases, and the water pump works; Situation 2: The remaining height of the water level remains unchanged, the rainfall and water pumping are equal, the water volume in the tank remains unchanged, and the water pump works; Situation 3: The remaining height of the water level continues to decrease, and the water volume in the tank increases; specifically, 1) the water pump is working, but the rainfall is greater than the water pumped; 2) the water pump is not working, and the rainfall and water level change rates are consistent; According to the change of water level, judge whether the water pump is working. 10. A digital twin-based substation site flooding risk early warning system according to claim 9, characterized in that the judging process of whether the pump is working is specifically: Calculate the water level change rate according to the obtained water level information. If the water level change rate is not lower than 0, the water pump is working; otherwise, judge 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 does not work.

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