High-environment-adaptability phase-change-adjustable intelligent power grid icing early warning method and device

Abstract

The invention relates to the technical field of icing monitoring, in particular to a phase change adjustable smart power grid icing early warning method and device with high environmental adaptability, the device performs icing detection through a liquid-solid phase change generator and a refrigeration device, and the method comprises the following steps: taking a current external environment temperature as an icing detection initial temperature; the current time is used as the icing detection starting time, refrigeration is accelerated through the refrigeration device, the temperature change of the liquid-solid phase change generator during liquid-solid conversion is monitored in real time, and the time when the icing detection initial temperature is reduced to the actual icing critical temperature is determined; obtaining an external environment temperature corresponding to the time, obtaining an environment temperature change prediction curve through linear prediction, and determining the predicted icing time of the power transmission line; and generating an icing early warning signal according to the predicted icing time, wherein the icing early warning signal is used for prompting an icing risk. By accurately monitoring and predicting the icing condition of the power transmission line, an early warning signal is generated in time, and the power system fault risk caused by icing is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of icing monitoring, and more specifically, to a phase-change adjustable intelligent power grid icing warning method and device with high environmental adaptability. Background Art

[0002] Transmission lines are an important part of the power system, and their safe operation is an important factor in ensuring the power transmission capacity in the power system. In recent years, with the continuous construction of extra-high voltage and ultra-high voltage lines, more lines need to pass through severely icing areas with complex climates. When the icing and snow load on the line exceeds the design standard, it will cause conductor galloping or even breakage, and in severe cases, it may lead to serious damage to the tower and its connecting components, resulting in serious accidents such as tower inclination and collapse, thus threatening the safe and stable operation of the entire power system.

[0003] As an effective method for measuring the natural icing of transmission lines, icing monitoring technology helps the power department to timely understand the icing conditions on the site of transmission lines and formulate targeted anti-icing and de-icing schemes for transmission lines. In terms of transmission line icing monitoring technology, currently there are mainly meteorological methods, image monitoring methods, weighing methods, capacitance methods, etc. However, the above methods mainly measure the icing growth or icing thickness of transmission lines, are easily affected by the complexity of the climate, reduce the accuracy of monitoring, are difficult to accurately measure the early icing conditions of transmission lines, and cannot give early warnings of icing conditions. Therefore, designing a high-environment self-adaptive phase-change adjustable intelligent power grid icing warning device that can comprehensively consider external complex environmental factors, accurately identify the icing state, and adjust its own structural operation mode according to changes in external environmental conditions to more accurately monitor the early icing conditions of transmission lines has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of this, the present application provides a phase-change adjustable intelligent power grid icing warning method and device with high environmental adaptability, which is used to monitor the early icing conditions of the line and predict the future icing time, and improve the accuracy of transmission line icing forecasting.

[0005] The technical solutions provided by the present application are as follows: In the first aspect, the present application provides a phase-change adjustable intelligent power grid icing warning method with high environmental adaptability, which is applied to a phase-change adjustable intelligent power grid icing warning device with high environmental adaptability. When it is detected that the external environmental temperature is lower than the preset critical warning temperature, the device performs icing detection through a liquid-solid phase change generator and a refrigeration device. The method includes: Taking the current ambient temperature as the initial temperature for icing detection and the current time as the start time for icing detection, accelerating refrigeration through the refrigeration device, and monitoring in real time the temperature change when the liquid-solid phase change generator undergoes liquid-solid conversion, to determine the time when the temperature drops from the initial temperature for icing detection to the critical temperature of actual icing; Obtaining the ambient temperature corresponding to the time, obtaining the predicted curve of ambient temperature change through linear prediction, and determining the predicted icing time of the transmission line; Generating an icing warning signal according to the predicted icing time for prompting the icing risk.

[0006] In one possible implementation, monitoring in real time the temperature change when the liquid-solid phase change generator undergoes liquid-solid conversion includes: Monitoring the current change of the liquid-solid phase change generator and determining the temperature change according to the current change; When it is monitored that the current of the liquid-solid phase change generator undergoes a sudden change, measuring the change mutation value and mutation time of the current, and taking the mutation time as the time when the liquid-solid conversion occurs and the temperature drops from the initial temperature for icing detection to the critical temperature of actual icing.

[0007] In one possible implementation, the predicted curve of ambient temperature change obtained through linear prediction is expressed as: (1) In the formula, t a is the start time for icing detection, t b is the end time for icing detection, T a is the initial temperature for icing detection, T b is the preset critical warning temperature, T c is the current ambient temperature at the end of icing detection, T d is the critical temperature of actual icing; t c is the predicted icing time, expressed as: (2) In a second aspect, the present application provides a phase change adjustable intelligent power grid icing warning device with high environmental adaptability, including a liquid-solid phase change generator, a refrigeration device, and a control circuit module; the control circuit module is used to execute the high environmental adaptability phase change adjustable intelligent power grid icing warning method according to any item in the first aspect; The refrigeration device is used to adjust the working power for accelerating refrigeration according to the ambient temperature; The liquid-solid phase change generator is used to monitor the temperature change during the liquid-solid conversion under accelerated refrigeration, and determine the time when the temperature drops from the initial ice-covering detection temperature to the critical temperature of actual ice-covering.

[0008] In one possible implementation, the device further includes a heat dissipation device for discharging the heat generated during the refrigeration process, and maintaining the operating temperature of the ice-covering warning device for the phase change adjustable smart power grid with high environmental adaptability within a preset safe temperature range.

[0009] Compared with the prior art, the technical solution provided by this application has the following beneficial effects: By continuously monitoring the environmental temperature and combining the use of the liquid-solid phase change generator and the refrigeration device, this application can provide accurate early warnings before ice-covering occurs. This method not only enhances the monitoring ability of ice-covering conditions, but also improves the accuracy of ice-formation time prediction through a linear prediction model. By generating ice-covering early warning signals in advance, relevant personnel can be notified in time to take necessary preventive measures, thus significantly reducing the risk of transmission line failures caused by ice-covering and ensuring the stable operation of the power system. In addition, this method reduces the dependence on manual monitoring, improves the automation level, reduces the maintenance cost, and at the same time improves the response speed and processing efficiency of the power system. Brief Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of an ice-covering warning device for a phase change adjustable smart power grid with high environmental adaptability provided in Embodiment 1 of this application.

[0011] Figure 2 It is a sectional view of an ice-covering warning device for a phase change adjustable smart power grid with high environmental adaptability provided in Embodiment 1 of this application.

[0012] Figure 3 It is a schematic diagram of the internal connection relationship of an ice-covering warning device for a phase change adjustable smart power grid with high environmental adaptability provided in Embodiment 1 of this application.

[0013] Figure 4 It is a schematic diagram of the test results of ice-covering detection based on the ice-covering warning device for a phase change adjustable smart power grid with high environmental adaptability provided in Embodiment 1 of this application.

[0014] Figure 5 It is a flowchart of an ice-covering warning method for a phase change adjustable smart power grid with high environmental adaptability provided in Embodiment 2 of this application.

[0015] Figure 6 It is a schematic diagram of determining the predicted ice-covering time according to the linear prediction algorithm provided in Embodiment 2 of this application.

[0016] Description of reference numerals: 1-1, liquid-solid phase change generator; 1-2, encapsulation housing; 1-3, refrigeration device; 1-4, control circuit module; 1-5, heat dissipation device. Detailed implementation manners

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0018] In order to solve the deficiencies existing in the prior art in the ice coating warning of transmission lines, the present application proposes a transmission line ice coating warning device and method with high environmental self-adaptability and phase change adjustability. The device and method can effectively cope with complex and changeable natural environments, accurately monitor the ice coating situation of transmission lines, and thus provide reliable guarantees for the safe operation of power systems. The following will elaborate in detail on the high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning device and method of the present application in conjunction with specific embodiments.

[0019] Embodiment 1

[0020] Refer to Figures 1 to 3 , which is a schematic structural diagram of a high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning device provided in Embodiment 1 of the present application. As shown in the figure, the high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning device includes a liquid-solid phase change generator 1-1, an encapsulation housing 1-2, a refrigeration device 1-3, a control circuit module 1-4, and a heat dissipation device 1-5.

[0021] The encapsulation housing 1-2 of the high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning device is made of insulating materials, such as special plastics or composite materials, to protect the internal electronic components from extreme temperatures and humidity and ensure long-term stability and durability. The liquid-solid phase change generator is fixed inside the encapsulation housing by threaded connection. The refrigeration device is embedded in the central hollow position of the heat dissipation device and is integrally sealed in the encapsulation housing. Its refrigeration end face is closely attached to the bottom of the liquid-solid phase change generator, thereby ensuring the efficient transfer of the refrigeration effect and enabling the liquid-solid phase change generator to detect the phase change process of liquid water to solid ice in advance. The heat conduction end face of the heat dissipation device is closely attached to the bottom of the refrigeration device to facilitate the rapid conduction of the heat generated during the refrigeration process to the external environment and maintain the stable operation of the device. The control circuit module 1-4 is designed to be circular and is embedded in the inner wall of the encapsulation housing. The central hollow part can accommodate the refrigeration device.

[0022] In a specific application scenario, the ambient temperature is continuously monitored by a temperature sensor configured inside a phase-change adjustable intelligent power grid icing warning device with high environmental adaptability. When the ambient temperature approaches 0°C, and it is detected that the current weather is rainy or snowy, and the temperature collected by the phase-change adjustable intelligent power grid icing warning device with high environmental adaptability is lower than the pre-set warning temperature, the phase-change adjustable intelligent power grid icing warning device with high environmental adaptability starts monitoring. Specifically, the control circuit module 1-4 sends out a control signal to start the liquid-solid phase-change generator 1-1 and the refrigeration device 1-3 to monitor the icing condition.

[0023] In the embodiment of the present application, the above device comprehensively converts various environmental factors affecting icing, including but not limited to temperature, humidity, and wind speed, into the influence of the environment on the liquid-solid phase change, and records the mutation moment of the phase change from liquid water to solid ice. The mutation moment of the above phase change from liquid water to solid ice is converted into a current mutation change of the liquid-solid phase-change generator, so that the state of the liquid-solid conversion can be more intuitively displayed, facilitating the identification of the icing state.

[0024] The above refrigeration device 1-3 is specifically used to advance or delay the time of liquid-solid phase change according to the change of external environmental conditions, so as to more accurately monitor the early icing condition of the transmission line and predict the icing time, showing good environmental adaptability.

[0025] In a specific application scenario, by adjusting the working power of the above refrigeration device in real time, the formation of ice layer is accelerated. The liquid-solid phase-change generator is used to detect the icing condition and determine the mutation moment, i.e., the time inflection point, of the phase change process from liquid water to solid ice, as shown in Figure 4 When the liquid water begins to transform into solid ice, the sensed temperature of the liquid-solid phase-change generator 1-1 drops rapidly, and its internal physical state changes, which causes a mutation in the current passing through the liquid-solid phase-change generator 1-1. By monitoring the mutation value of the above current and recording the mutation time, the early icing condition can be judged, thereby realizing the real-time monitoring of the ice layer formation.

[0026] Furthermore, considering that the refrigeration device 1-3 generates heat during the monitoring process. If this heat cannot be discharged in time, it will cause the internal temperature of the device to rise, which will in turn affect the performance of the sensors inside the device and the monitoring accuracy. To ensure the stable performance of the device during the monitoring process, the above heat dissipation device 1-5 is provided in the embodiment of the present application to discharge the heat generated during the refrigeration process. At the same time, after the temperature on the surface of the phase-change adjustable intelligent power grid icing warning device with high environmental adaptability reaches the required stable working state, the heat dissipation device 1-5 can continuously maintain this appropriate safe temperature range to ensure the long-term reliable operation of the phase-change adjustable intelligent power grid icing warning device with high environmental adaptability, and avoid the performance degradation or misjudgment of the device due to temperature fluctuations.

[0027] The above control circuit modules 1-4 are specifically used for coordinating and controlling each part of the ice coating warning for transmission lines, including sensor signal processing, start-up and shutdown control of the liquid-solid phase change generator and the refrigeration device, control of different working powers of the refrigeration device, and adjustment of the heat dissipation device, so as to ensure that the phase change adjustable intelligent power grid ice coating warning device with high environmental self-adaptability operates accurately and reliably under different environmental conditions. Among them, the above sensor signals include but are not limited to environmental parameters such as temperature, humidity, wind speed, etc. and the current change signal of the liquid-solid phase change generator.

[0028] The control circuit modules 1-4 receive the data collected by the liquid-solid phase change generator and the temperature sensor. Make decisions according to the preset algorithm and different warning critical temperatures set in advance. Once the formation of ice layer is detected, the control circuit modules 1-4 will trigger the warning system and send an alarm to the user. Next, the above warning process will be further elaborated in combination with the method embodiments.

[0029] Compared with the prior art, the technical solution provided by the first embodiment of the present application has the following beneficial effects: The present application detects the early ice coating condition of the transmission line, is less affected by environmental interference factors, comprehensively converts the complex external environmental factors affecting icing into the influence of the environment on the liquid-solid phase change, determines the mutation moment of the phase change from liquid water to solid ice, converts the state at the moment of phase change into the mutation change of current, can more intuitively display the state of liquid-solid conversion, is conducive to identifying the icing state, and can adjust the working power of the accelerated refrigeration device in real time according to the change of external environmental conditions, change the forward or backward time of the liquid-solid phase change, and can more accurately predict the icing time, with excellent environmental self-adaptability.

[0030] Embodiment Two

[0031] The second embodiment of the present application provides a high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning method based on a linear prediction model. Dynamically control and adjust the working power of the refrigeration device according to the change of external environmental conditions, so as to change the time of the liquid-solid phase change point, and further realize the accurate prediction of the icing time.

[0032] Specifically, refer to Figure 5 , which is a flowchart of a high environmental self-adaptability phase change adjustable intelligent power grid ice coating warning method provided by the second embodiment of the present application. As Figure 5 shown in, the specific implementation method of the above method includes: Step 101, Monitor the external environmental temperature in real time, and judge whether the above external environmental temperature is less than the preset critical warning temperature T b .

[0033] Step 102: If the above-mentioned external environmental temperature is less than the above-mentioned preset critical warning temperature, then use the current moment as the icing detection start time t a , and use the current external environmental temperature T a as the initial icing detection temperature.

[0034] Step 103: Operate the liquid-solid phase change generator and the refrigeration device, monitor and record the temperature change when the liquid-solid phase change generator undergoes liquid-solid conversion, and obtain an accelerated refrigeration temperature change curve.

[0035] Specifically, as shown in Figure 6 , under accelerated refrigeration conditions, after t b -t a of time, the temperature drops from the initial icing detection temperature T a to the critical temperature at which actual icing is detected by the phase change adjustable intelligent power grid icing warning device with high environmental adaptability T d . Subsequently, record the time t b , and use the time t b as the icing detection end time.

[0036] Step 104: Monitor and record the change of the external environmental temperature, and obtain an environmental temperature change curve.

[0037] As shown in Figure 4 , within the time period from t a to t b , the external environmental temperature drops from the initial icing detection temperature T a to T c . At this time, the icing detection ends, and then determine the current temperature T c as the current external environmental temperature at the end of the icing detection.

[0038] Step 105: According to the above environmental temperature change curve and the accelerated refrigeration temperature change curve, predict the environmental temperature change prediction curve based on the linear prediction model.

[0039] Step 106: According to the above environmental temperature change prediction curve, determine the expected icing time of the transmission line t c .

[0040] Specifically, as shown in Figure 4As shown, based on the above environmental temperature change prediction curve, the intersection of the environmental temperature change prediction curve and the straight line y = T d is the predicted icing time t c .

[0041] It can be seen from the figure that (1) Therefore, the predicted icing time t c can be expressed as: (2) Step 107, generate an icing warning signal according to the above predicted icing time t c to prompt the upcoming icing risk.

[0042] Compared with the prior art, the technical solution provided in the second embodiment of the present application has the following beneficial effects: By monitoring the external environmental temperature in real time and comparing it with the preset critical warning temperature, the present application can start the warning monitoring in time before the icing occurs. By using the liquid-solid phase change generator and the refrigeration device, combined with the linear prediction model, the icing time can be accurately predicted, providing sufficient time for the maintenance personnel of the power system to take preventive measures and reducing the risk of power outages and equipment damage caused by icing.

[0043] In addition, through the automated monitoring and warning mechanism, the response speed and accuracy are improved, the need for manual monitoring is reduced, and thus the work efficiency is improved. The icing warning signal generated by the system can be communicated to the relevant personnel in a timely manner through various channels to ensure the rapid circulation and effective execution of information.

[0044] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A highly environmentally adaptive phase-change adjustable smart grid icing early warning method, characterized in that: A phase-change adjustable smart grid icing warning device applied to high environmental adaptability, when the external environment temperature is monitored to be lower than a preset critical warning temperature, the device detects icing through a liquid-solid phase change generator and a refrigeration device, and the method includes: The current external environment temperature is used as the initial temperature for ice detection, and the current time is used as the start time for ice detection. The refrigeration device is used to accelerate refrigeration, and the temperature change of the liquid-solid phase change generator when liquid-solid conversion occurs is monitored in real time to determine the time when the initial temperature for ice detection is reduced to the critical temperature for actual ice. Obtaining the external environment temperature corresponding to the time, obtaining an environment temperature change prediction curve through linear prediction, and determining the expected icing time of the transmission line; An icing warning signal is generated according to the estimated icing time to indicate the risk of icing.

2. The highly environmentally adaptive phase-change adjustable smart grid icing early warning method according to claim 1 is characterized in that: Real-time monitoring of the temperature change of the liquid-solid phase change generator when liquid-solid conversion occurs includes: Monitoring the current change of the liquid-solid phase change generator, and determining the temperature change according to the current change; When a sudden change in the current of the liquid-solid phase change generator is detected, the sudden change value and the sudden change time of the current are measured, and the sudden change time is used as the time when the liquid-solid conversion occurs and the initial temperature of the ice detection is reduced to the critical temperature of the actual ice.

3. The highly environmentally adaptive phase-change adjustable smart grid icing early warning method according to claim 1 is characterized in that: The predicted curve of ambient temperature change obtained by linear prediction is expressed as: （1） In the formula, t a is the start time of ice detection, t b is the end time of ice detection, T a To detect the initial temperature of ice cover, T b To preset the critical warning temperature, T c is the current external environment temperature when ice detection ends, T d is the critical temperature of actual ice cover; t c is the estimated ice-covering time, expressed as: （2）。 4. A highly environmentally adaptive phase-change adjustable smart grid icing warning device, characterized in that: It includes a liquid-solid phase change generator, a refrigeration device and a control circuit module; the control circuit module is used to execute the highly environmentally adaptive phase change adjustable smart grid icing warning method as described in any one of claims 1 to 3; The refrigeration device is used to adjust the working power according to the external environment temperature to accelerate refrigeration; The liquid-solid phase change generator is used to monitor the temperature change when liquid-solid conversion occurs under accelerated refrigeration, and determine the time when the initial temperature of ice coating detection decreases to the critical temperature of actual ice coating.

5. The highly environmentally adaptive phase-change adjustable smart grid icing warning device according to claim 4 is characterized in that: The device also includes a heat dissipation device for dissipating heat generated during the refrigeration process to maintain the operating temperature of the highly environmentally adaptive phase-change adjustable smart grid icing warning device within a preset safe temperature range.

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