Multi-mode protection system of Internet of Things breaker oriented to wind-solar-storage cooperation
Through the multi-modal protection system of the Internet of Things circuit breaker for wind and light storage coordination, the combined change line chart and temperature change coefficient are used to detect temperature abnormalities in the transmission line, and the problem of transmission line detection accuracy and efficiency in the wind and light storage coordinated power grid is solved, and safety and operation efficiency are improved.
Patent Information
- Application Number
- CN202510669882.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-08-05
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the wind, light and storage collaborative power grid, the temperature detection accuracy of the transmission line is not high, and internal faults cannot be discovered in time, resulting in safety accidents and low operating efficiency, and the cause of temperature abnormalities cannot be accurately judged, affecting the safety and efficiency of the power grid.
A multi-modal protection system for Internet of Things circuit breakers for wind, light and storage coordination is adopted to obtain physical perception data and environmental parameter information of the transmission line through multi-modal perception components, establish a joint change line chart, and combine temperature variation coefficients and current and voltage volatility to achieve accurate detection and early warning of the temperature and state of the transmission line.
It improves the safety performance of the transmission line and the safety and efficiency of the wind, light and storage collaborative power grid, can detect temperature abnormalities in advance, reduce maintenance time, accurately judge abnormal states, and avoid safety accidents.
Smart Images
Figure CN120433145A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power grid security technology, and more specifically, to an Internet of Things circuit breaker multi-modal protection system for wind, solar and energy storage collaboration. Background Art
[0002] The patent application with publication number CN117559656A discloses an Internet-based transmission line safety monitoring system, which relates to the field of power safety technology and is used to solve the problems of existing transmission line safety monitoring methods, such as insufficient monitoring accuracy, suboptimal early warning effects, limited monitoring range, and difficulty in ensuring the stable operation of transmission lines. Specifically, the system is an Internet-based transmission line safety monitoring system, comprising a data acquisition unit, a cloud database, a safety prediction unit, a conventional monitoring unit, a key monitoring unit, a special monitoring unit, and a display terminal. Through multiple data monitoring methods, the operating status of each transmission line can be comprehensively and accurately monitored, and abnormal conditions of the transmission line can be discovered in a timely manner. A hierarchical management method is adopted to implement different monitoring and processing measures for transmission lines of different levels, thereby improving the accuracy and efficiency of monitoring and taking corresponding monitoring measures to effectively avoid safety accidents of the transmission line and improve the safety performance of the transmission line.
[0003] However, when traditional methods detect the temperature of transmission lines, they only detect the surface temperature of the transmission lines. However, when a fault occurs inside the transmission line, the temperature of the internal conductors first rises and then transfers the temperature to the external insulation. It takes time to transfer heat. When the surface temperature of the transmission line is detected to be abnormal, the temperature of the internal conductors of the transmission line has already been abnormal, and the temperature abnormality of the transmission line cannot be detected in the first time, thereby reducing the accuracy and efficiency of detection, causing safety accidents of the transmission line, reducing the safety performance of the transmission line, and further reducing the safety of the wind, solar and storage coordinated power grid. In addition, when traditional methods detect temperature abnormalities in the transmission line, they do not know the cause of the temperature abnormality, thereby increasing the maintenance time of the transmission line, and further reducing the operating efficiency of the wind, solar and storage coordinated power grid. The intermittent and fluctuating nature of wind power generation and photovoltaic power generation will cause voltage or current fluctuations. If normal fluctuations and abnormal fluctuations cannot be accurately detected, misjudgment will occur, thereby reducing the safety and operating efficiency of the wind, solar and storage coordinated power grid.
[0004] In view of this, the present invention proposes an IoT circuit breaker multi-modal protection system for wind, solar and storage collaboration to solve the above problems. Summary of the Invention
[0005] In order to overcome the above-mentioned defects of the prior art and achieve the above-mentioned objectives, the present invention provides the following technical solutions: an IoT circuit breaker multimodal protection system for wind, solar and storage collaboration, comprising a multimodal protection center, wherein the multimodal protection center is communicatively connected to a multimodal sensing component, a temperature anomaly detection component, a fluctuation anomaly detection component and an anomaly warning component;
[0006] Multimodal perception component, responsible for acquiring physical perception data and environmental parameter information data of transmission lines in the wind, solar and storage coordinated power grid;
[0007] The temperature anomaly detection component is responsible for detecting the temperature of the transmission line within the monitoring period based on the physical perception data and environmental parameter information data of the transmission line, establishing a joint change line graph, judging whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and obtaining the temperature variation coefficient. Based on the temperature variation coefficient, it is judged whether the temperature of the transmission line is in an abnormally high temperature state. When the temperature of the transmission line is in an abnormally high temperature state, the reason for the abnormally high temperature state of the transmission line is obtained based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph;
[0008] The fluctuation anomaly detection component is responsible for detecting the temperature of the transmission line and obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical sensing data of the transmission line. It also obtains the fluctuation status of the current and voltage of the transmission line based on the current fluctuation rate and voltage fluctuation rate.
[0009] The abnormal warning component is responsible for issuing warnings based on the fluctuation status of current and voltage and the temperature detection results of the transmission line.
[0010] Furthermore, the physical sensing data includes the temperature, current and voltage of the transmission lines in the wind-solar-storage coordinated power grid;
[0011] The temperature of the transmission line includes the temperature of the conductor inside the transmission line and the temperature of the insulation outside the transmission line, and the environmental parameter information data includes the ambient temperature of the transmission line in the wind, solar and energy storage coordinated power grid.
[0012] Furthermore, the method for establishing the joint change line graph includes:
[0013] The monitoring period is divided into k monitoring time points, and the internal conductor temperature of the transmission line, the external insulation temperature of the transmission line, and the ambient temperature of the transmission line at each monitoring time point are obtained;
[0014] Establish a blank two-dimensional rectangular coordinate system, set the abscissa of the blank two-dimensional rectangular coordinate system to time, set the ordinate of the blank two-dimensional rectangular coordinate system to temperature, fill the internal conductor temperature of the transmission line, the external insulation temperature of the transmission line, and the ambient temperature of the transmission line at each monitoring time point into the blank two-dimensional rectangular coordinate system, and obtain the internal conductor temperature projection point, the external insulation temperature projection point, and the ambient temperature projection point at each monitoring time point;
[0015] Draw a straight line in chronological order to connect the internal conductor temperature projection points in sequence, and highlight the internal conductor temperature projection points and the straight line connecting the internal conductor temperature projection points in red. Draw a straight line in chronological order to connect the external insulation temperature projection points in sequence, and highlight the external insulation temperature projection points and the straight line connecting the external insulation temperature projection points in orange. Draw a straight line in chronological order to connect the ambient temperature projection points in sequence, and highlight the ambient temperature projection points and the straight line connecting the ambient temperature projection points in green to obtain a joint change line graph.
[0016] Furthermore, the method for determining whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph includes:
[0017] A high temperature threshold is set, and the internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the high temperature threshold. The internal conductor temperature projection point corresponding to the internal conductor temperature greater than or equal to the high temperature threshold is obtained and recorded as the internal conductor high temperature projection point. The monitoring time point corresponding to the internal conductor high temperature projection point is recorded as the high temperature time point. At the high temperature time point, the temperature of the transmission line is in an abnormally high temperature state, and at a time point other than the high temperature time point, the temperature of the transmission line is not in an abnormally high temperature state.
[0018] Furthermore, the method for obtaining the temperature variation coefficient includes:
[0019] Starting from the second internal conductor temperature projection point, the internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point. If the internal conductor temperature corresponding to the internal conductor temperature projection point is greater than the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point, the internal conductor temperature projection point is highlighted in purple until the last internal conductor temperature projection point is reached.
[0020] Draw a line parallel to the horizontal axis through the internal conductor temperature projection point highlighted in purple, and record it as the first parallel line to be analyzed. Draw a line parallel to the horizontal axis through the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point highlighted in purple, and record it as the second parallel line to be analyzed. Obtain the shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed. Use the shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed as the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple.
[0021] Furthermore, the method for determining whether the temperature of the transmission line is in an abnormal temperature change state based on the temperature change coefficient includes:
[0022] Set the temperature variation coefficient threshold. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is greater than or equal to the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is in a temperature variation abnormal state. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is less than the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is not in a temperature variation abnormal state.
[0023] Furthermore, the method for obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph includes:
[0024] Extract the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point at the high temperature time point. If the internal conductor high temperature projection point at the high temperature time point is above the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: an internal fault in the transmission line. If the internal conductor high temperature projection point at the high temperature time point is below the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: the ambient temperature of the transmission line is too high.
[0025] If the high temperature projection point of the internal conductor at the high temperature time point coincides with the external insulation temperature projection point, the reason why the temperature of the transmission line is in an abnormally high temperature state at the high temperature time point is obtained based on the positional relationship between the high temperature projection point of the internal conductor at the high temperature time point and the ambient temperature projection point.
[0026] Furthermore, the method for obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state at the high temperature time point based on the positional relationship between the high temperature projection point of the internal conductor and the ambient temperature projection point at the high temperature time point includes:
[0027] If the high-temperature projection point of the internal conductor at the high-temperature time point is above the ambient temperature projection point, then the reason why the temperature of the transmission line is in an abnormally high temperature state at the high-temperature time point is: an internal fault of the transmission line; if the high-temperature projection point of the internal conductor at the high-temperature time point is below the ambient temperature projection point, then the reason why the temperature of the transmission line is in an abnormally high temperature state at the high-temperature time point is: the ambient temperature of the transmission line is too high;
[0028] If the high temperature projection point of the internal conductor at the high temperature time point coincides with the ambient temperature projection point, the reason why the temperature of the transmission line at the high temperature time point is in an abnormally high temperature state is: an internal fault in the transmission line or the ambient temperature of the transmission line is too high.
[0029] Furthermore, the method of obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical sensing data of the transmission line while detecting the temperature of the transmission line, and obtaining the fluctuation state of the current and voltage of the transmission line based on the current fluctuation rate and the voltage fluctuation rate includes:
[0030] The current and voltage of the transmission line during the monitoring period are sampled separately, with a sampling frequency of P Hz, to obtain the current sequence I and voltage sequence U respectively;
[0031] Where, I={I0,I1,I2,……,I n―1}, U={U0,U1,U2,……,U n―1}; I0, I1, I2, ..., I n―1 are the current samples obtained by sampling the current of the transmission line, U0, U1, U2, ..., U n―1 is the voltage sample obtained by sampling the voltage of the transmission line, and n is the number of current samples and voltage samples;
[0032] Obtain the current fluctuation rate LB of the transmission line according to the current sequence i ;
[0033] in, i is the index of current fluctuation rate, i=1,2,3……,n―1,LB i is the current fluctuation rate of the i-th transmission line, I i is the i-th current sample, I i―1 is the previous current sample of the i-th current sample, Δt is the sampling interval,
[0034] A current fluctuation rate threshold is set. When the current fluctuation rate of the transmission line is greater than the current fluctuation rate threshold, the current fluctuation state of the transmission line is an abnormal fluctuation state. When the current fluctuation rate of the transmission line is less than or equal to the current fluctuation rate threshold, the current fluctuation state of the transmission line is a normal fluctuation state.
[0035] Obtain the voltage fluctuation rate YB of the transmission line according to the voltage sequence j ;
[0036] in, j is the index of voltage fluctuation rate, j=1,2,3……,n―1,YB j is the jth voltage fluctuation rate of the transmission line, U j is the jth voltage sample, U j―1 is the previous voltage sample of the j-th voltage sample;
[0037] A voltage fluctuation rate threshold is set. When the voltage fluctuation rate of the transmission line is greater than the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is an abnormal fluctuation state. When the voltage fluctuation rate of the transmission line is less than or equal to the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is a normal fluctuation state.
[0038] Furthermore, the method for providing early warning based on the fluctuation state of current and voltage and the temperature detection result of the transmission line includes:
[0039] When the temperature of the transmission line is abnormally high, the IoT circuit breaker in the transmission line is turned on, the transmission line is cut off, a red alert is issued, and relevant personnel are dispatched to deal with the cause of the abnormal high temperature of the transmission line;
[0040] When the temperature of the transmission line is in an abnormal temperature change state, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, a yellow warning is issued, and relevant personnel are dispatched to deal with it;
[0041] When the current fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, an orange warning is issued, and relevant personnel are dispatched to deal with it;
[0042] When the voltage fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is turned on, the transmission line is cut off, a blue warning is issued, and relevant personnel are dispatched to deal with it.
[0043] The technical effects and advantages of the multi-modal protection system for wind, solar and energy storage-coordinated IoT circuit breakers of the present invention are as follows:
[0044] 1. Determine whether the temperature of the transmission line is abnormally high based on the joint change line graph, obtain the temperature variation coefficient, determine whether the temperature of the transmission line is abnormally high based on the temperature variation coefficient, and determine whether the temperature of the transmission line is abnormal based on the temperature of the internal conductors of the transmission line. Detect temperature anomalies in the transmission line in advance, that is, be able to detect temperature anomalies in the transmission line immediately, thereby improving detection accuracy and efficiency, avoiding safety accidents in the transmission line, improving the safety performance of the transmission line, and thus improving the security of the wind, solar and energy storage coordinated power grid;
[0045] 2. When the temperature of a transmission line is abnormally high, the cause of the abnormal high temperature of the transmission line is determined based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph. Relevant personnel can then perform repairs based on the cause of the abnormal high temperature. This eliminates the need to determine the cause, thereby reducing the maintenance time of the transmission line and improving the operational efficiency of the wind, solar, and energy storage coordinated power grid.
[0046] 3. While detecting the temperature of the transmission line, the current fluctuation rate and voltage fluctuation rate of the transmission line are obtained based on the physical perception data of the transmission line, and the fluctuation state of the current and voltage of the transmission line is obtained based on the current fluctuation rate and voltage fluctuation rate. The fluctuation state of the current and voltage of the transmission line is accurately obtained, and it is judged whether the current and voltage of the transmission line fluctuate normally or abnormally, thereby improving the safety and operation efficiency of the wind, solar and storage coordinated power grid. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] Figure 1 Schematic diagram of the multi-modal protection system for IoT circuit breakers oriented to wind, solar and energy storage collaboration of the present invention;
[0048] Figure 2 Schematic diagram of the multi-modal protection method for IoT circuit breakers oriented to wind, solar and energy storage collaboration of the present invention;
[0049] Figure 3 This is a flow chart for obtaining the temperature variation coefficient of the present invention. DETAILED DESCRIPTION
[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0051] Example 1
[0052] See also Figure 1and Figure 3 As shown, this embodiment of the multimodal protection system for IoT circuit breakers for wind, solar and storage collaboration includes a multimodal protection center, which is communicatively connected to a multimodal sensing component, a temperature anomaly detection component, a fluctuation anomaly detection component and an anomaly warning component;
[0053] Multimodal perception component, responsible for acquiring physical perception data and environmental parameter information data of transmission lines in the wind, solar and storage coordinated power grid;
[0054] The temperature anomaly detection component is responsible for detecting the temperature of the transmission line within the monitoring period based on the physical perception data and environmental parameter information data of the transmission line, establishing a joint change line graph, judging whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and obtaining the temperature variation coefficient. Based on the temperature variation coefficient, it is judged whether the temperature of the transmission line is in an abnormally high temperature state. When the temperature of the transmission line is in an abnormally high temperature state, the reason for the abnormally high temperature state of the transmission line is obtained based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph;
[0055] The fluctuation anomaly detection component is responsible for detecting the temperature of the transmission line and obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical sensing data of the transmission line. It also obtains the fluctuation status of the current and voltage of the transmission line based on the current fluctuation rate and voltage fluctuation rate.
[0056] The abnormal warning component is responsible for issuing warnings based on the fluctuation status of current and voltage and the temperature detection results of the transmission line.
[0057] The process of obtaining physical perception data and environmental parameter information data of the transmission lines in the wind-solar-storage coordinated power grid includes:
[0058] Physical sensing data includes the temperature, current, and voltage of the transmission lines in the wind-solar-storage coordinated power grid. The temperature of the transmission lines includes the temperature of the internal conductors and the temperature of the external insulation of the transmission lines. Environmental parameter information data includes the ambient temperature of the transmission lines in the wind-solar-storage coordinated power grid.
[0059] The current of the transmission line in the wind-solar-storage coordinated power grid is obtained through the current sensor, the voltage of the transmission line in the wind-solar-storage coordinated power grid is obtained through the voltage sensor, and the temperature of the transmission line in the wind-solar-storage coordinated power grid and the ambient temperature of the transmission line in the wind-solar-storage coordinated power grid are obtained through the temperature sensor.
[0060] The temperature of the transmission line is detected within a monitoring period based on the physical perception data and environmental parameter information data of the transmission line, specifically including: establishing a joint change line graph, judging whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and obtaining a temperature variation coefficient, judging whether the temperature of the transmission line is in an abnormally high temperature state based on the temperature variation coefficient, and when the temperature of the transmission line is in an abnormally high temperature state, obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph;
[0061] The process of creating a joint change line chart includes:
[0062] The monitoring period is divided into k monitoring time points, and the internal conductor temperature of the transmission line, the external insulation temperature of the transmission line, and the ambient temperature of the transmission line at each monitoring time point are obtained;
[0063] Establish a blank two-dimensional rectangular coordinate system, set the horizontal coordinate of the blank two-dimensional rectangular coordinate system to time, set the vertical coordinate of the blank two-dimensional rectangular coordinate system to temperature, fill the internal conductor temperature of the transmission line at each monitoring time point into the blank two-dimensional rectangular coordinate system, obtain the internal conductor temperature projection point at each monitoring time point, fill the external insulation temperature of the transmission line at each monitoring time point into the blank two-dimensional rectangular coordinate system, obtain the external insulation temperature projection point at each monitoring time point, fill the ambient temperature of the transmission line at each monitoring time point into the blank two-dimensional rectangular coordinate system, obtain the ambient temperature of the transmission line at each monitoring time point For the ambient temperature projection points at the points, draw a straight line to connect the internal conductor temperature projection points in sequence in chronological order, and highlight the internal conductor temperature projection points and the straight line connecting the internal conductor temperature projection points in red. Draw a straight line to connect the external insulation temperature projection points in sequence in chronological order, and highlight the external insulation temperature projection points and the straight line connecting the external insulation temperature projection points in orange. Draw a straight line to connect the ambient temperature projection points in sequence in chronological order, and highlight the ambient temperature projection points and the straight line connecting the ambient temperature projection points in green to obtain a joint change line graph.
[0064] It should be explained that the internal conductor temperature projection point and the straight line connecting the internal conductor temperature projection points are highlighted in red, the external insulation temperature projection point and the straight line connecting the external insulation temperature projection points are highlighted in orange, and the ambient temperature projection point and the straight line connecting the ambient temperature projection points are highlighted in green. This is to distinguish the internal conductor temperature change line, the external insulation temperature change line, and the ambient temperature change line in the subsequent analysis of the joint change line graph to avoid confusion and to more clearly and accurately identify the internal conductor temperature change trend, the external insulation temperature change trend, and the ambient temperature change trend.
[0065] The process of judging whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph includes:
[0066] A high temperature threshold is set. The high temperature threshold can be set through experimental data analysis or experience. The internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the high temperature threshold. The internal conductor temperature projection point corresponding to the internal conductor temperature greater than or equal to the high temperature threshold is obtained and recorded as the internal conductor high temperature projection point. The monitoring time point corresponding to the internal conductor high temperature projection point is recorded as the high temperature time point. At the high temperature time point, the temperature of the transmission line is in an abnormally high temperature state. At a time point other than the high temperature time point, the temperature of the transmission line is not in an abnormally high temperature state.
[0067] The process of obtaining the temperature variation coefficient and determining whether the temperature of the transmission line is in an abnormal temperature variation state based on the temperature variation coefficient includes:
[0068] Starting from the second internal conductor temperature projection point, the internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point. If the internal conductor temperature corresponding to the internal conductor temperature projection point is greater than the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point, the internal conductor temperature projection point is highlighted in purple until the last internal conductor temperature projection point is reached.
[0069] It should be explained that when the point adjacent to the left of the internal conductor temperature projection point is the internal conductor high temperature projection point, the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point does not exist and is not compared;
[0070] Obtain the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple, and determine whether the temperature of the transmission line at the monitoring time point corresponding to the internal conductor temperature projection point highlighted in purple is in an abnormal temperature variation state based on the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple. Specifically, the following steps are performed:
[0071] Draw a line parallel to the horizontal axis through the internal conductor temperature projection point highlighted in purple, and record it as the first parallel line to be analyzed. Draw a line parallel to the horizontal axis through the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point highlighted in purple, and record it as the second parallel line to be analyzed. Obtain the shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed. Use this shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed as the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple.
[0072] Set a temperature variation coefficient threshold. The temperature variation coefficient threshold can be set through experimental data analysis or experience. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is greater than or equal to the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is in a temperature variation abnormal state. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is less than the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is not in a temperature variation abnormal state.
[0073] It should be explained that the temperature of the transmission line at the monitoring time points corresponding to the remaining internal conductor temperature projection points is not in an abnormal temperature change state;
[0074] It should be explained that when the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is too high, that is, the internal conductor temperature corresponding to the internal conductor temperature projection point highlighted in purple suddenly increases sharply, there is a possibility that the internal conductor has a fault. Therefore, it is judged that the temperature of the transmission line at the monitoring time point corresponding to the internal conductor temperature projection point highlighted in purple is in an abnormal temperature variation state;
[0075] It should be explained that, when detecting the temperature of a transmission line, the traditional method only detects the surface temperature of the transmission line. However, when a fault occurs inside the transmission line, the temperature of the internal conductor first rises, and then the temperature is transferred to the external insulation. It takes time to transfer heat. When the surface temperature of the transmission line is detected to be abnormal, the temperature of the internal conductor of the transmission line has already been abnormal, and the temperature abnormality of the transmission line cannot be detected in the first time, thereby reducing the accuracy and efficiency of detection, causing safety accidents of the transmission line, reducing the safety performance of the transmission line, and further reducing the safety of the wind-solar-storage coordinated power grid. Therefore, the present invention determines whether the temperature of the transmission line is abnormal based on the temperature of the internal conductor of the transmission line, and detects the temperature abnormality of the transmission line in advance, that is, it can detect the temperature abnormality of the transmission line in the first time, thereby improving the accuracy and efficiency of detection, avoiding safety accidents of the transmission line, improving the safety performance of the transmission line, and further improving the safety of the wind-solar-storage coordinated power grid;
[0076] When the temperature of the transmission line is in an abnormally high temperature state, the process of obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph includes:
[0077] Extract the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point at the high temperature time point. If the internal conductor high temperature projection point at the high temperature time point is above the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: an internal fault in the transmission line. If the internal conductor high temperature projection point at the high temperature time point is below the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: the ambient temperature of the transmission line is too high.
[0078] If the internal conductor high temperature projection point coincides with the external insulation temperature projection point at the high temperature time point, the reason why the temperature of the transmission line is in an abnormally high temperature state at the high temperature time point is obtained based on the positional relationship between the internal conductor high temperature projection point and the ambient temperature projection point at the high temperature time point, specifically including:
[0079] If the high-temperature projection point of the internal conductor at the high-temperature time point is above the projection point of the ambient temperature, then the reason why the temperature of the transmission line is in an abnormally high-temperature state at the high-temperature time point is: an internal fault of the transmission line; if the high-temperature projection point of the internal conductor at the high-temperature time point is below the projection point of the ambient temperature, then the reason why the temperature of the transmission line is in an abnormally high-temperature state at the high-temperature time point is: the ambient temperature of the transmission line is too high; if the high-temperature projection point of the internal conductor at the high-temperature time point coincides with the projection point of the ambient temperature, then the reason why the temperature of the transmission line is in an abnormally high-temperature state at the high-temperature time point is: an internal fault of the transmission line or the ambient temperature of the transmission line is too high;
[0080] It needs to be explained that if the high temperature projection point of the internal conductor is above the projection point of the external insulation temperature, the internal conductor temperature is higher than the external insulation temperature, and the internal conductor temperature rises first, causing the external insulation temperature to rise. Therefore, the cause of the high temperature abnormality is: an internal fault in the transmission line. If the high temperature projection point of the internal conductor is below the projection point of the external insulation temperature, the external insulation temperature is higher than the internal conductor temperature, and the external insulation temperature rises first, causing the internal conductor temperature to rise. The reason why the external insulation temperature rises first is that the ambient temperature is too high. Therefore, the cause of the high temperature abnormality is: the ambient temperature of the transmission line is too high. If the high temperature projection point of the internal conductor is above the ambient temperature projection point, the internal conductor temperature is too high. The line temperature is higher than the ambient temperature. The internal conductor temperature rises first, causing the external insulation temperature to rise. The external insulation temperature rises, causing the ambient temperature to rise. Heat transfer takes time, and the ambient temperature has not yet risen to the same level as the internal conductor temperature. The source is still the internal conductor temperature. Therefore, the cause of the abnormal high temperature state is: an internal fault in the transmission line. If the internal conductor high temperature projection point is below the ambient temperature projection point, the ambient temperature is higher than the internal conductor temperature. The ambient temperature rises first, causing the external insulation temperature to rise. The external insulation temperature rises, causing the internal conductor temperature to rise. The ambient temperature is higher than the internal conductor temperature, and the source is the ambient temperature. Therefore, the cause of the abnormal high temperature state is: the ambient temperature of the transmission line is too high.
[0081] It needs to be explained that when the traditional method detects the temperature anomaly of the transmission line, it stops detection and issues an early warning, resulting in the cause of the temperature anomaly being unknown. When relevant personnel perform maintenance, they need to find out the cause of the temperature anomaly, which increases the maintenance time of the transmission line and further reduces the operating efficiency of the wind-solar-storage collaborative power grid. Therefore, when the temperature of the transmission line is in an abnormally high temperature state, the present invention obtains the cause of the abnormally high temperature state of the transmission line based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point and the internal conductor high temperature projection point in the joint change line graph. Relevant personnel perform maintenance based on the cause of the abnormally high temperature state, which saves the time of obtaining the cause of the abnormally high temperature state, thereby reducing the maintenance time of the transmission line and further improving the operating efficiency of the wind-solar-storage collaborative power grid.
[0082] The process of detecting the temperature of the transmission line and obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical sensing data of the transmission line, and obtaining the current and voltage fluctuation state of the transmission line based on the current fluctuation rate and the voltage fluctuation rate includes:
[0083] The current and voltage of the transmission line during the monitoring period are sampled separately, with a sampling frequency of P Hz, to obtain the current sequence I and voltage sequence U respectively;
[0084] Where, I={I0,I1,I2,……,I n―1}, U={U0,U1,U2,……,U n―1}; I0, I1, I2, ..., I n―1 are the current samples obtained by sampling the current of the transmission line, U0, U1, U2, ..., U n―1 is the voltage sample obtained by sampling the voltage of the transmission line, and n is the number of current samples and voltage samples;
[0085] Obtain the current fluctuation rate LB of the transmission line according to the current sequence i ;
[0086] in, i is the index of current fluctuation rate, i=1,2,3……,n―1,LB i is the current fluctuation rate of the i-th transmission line, I i is the i-th current sample, I i―1 is the previous current sample of the i-th current sample, Δt is the sampling interval,
[0087] Set a current fluctuation rate threshold. The current fluctuation rate threshold can be set through experimental data analysis or experience. When the current fluctuation rate of the transmission line is greater than the current fluctuation rate threshold, the current fluctuation state of the transmission line is abnormal. When the current fluctuation rate of the transmission line is less than or equal to the current fluctuation rate threshold, the current fluctuation state of the transmission line is normal.
[0088] Obtain the voltage fluctuation rate YB of the transmission line according to the voltage sequence j ;
[0089] in, j is the index of voltage fluctuation rate, j=1,2,3……,n―1,YB j is the jth voltage fluctuation rate of the transmission line, U j is the jth voltage sample, U j―1 is the previous voltage sample of the j-th voltage sample;
[0090] Set a voltage fluctuation rate threshold. The voltage fluctuation rate threshold can be set through experimental data analysis or experience. When the voltage fluctuation rate of the transmission line is greater than the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is abnormal. When the voltage fluctuation rate of the transmission line is less than or equal to the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is normal.
[0091] It needs to be explained that the intermittent and fluctuating nature of wind power generation and photovoltaic power generation will cause voltage or current fluctuations. If normal fluctuations and abnormal fluctuations cannot be accurately detected, normal fluctuations will be judged as abnormal fluctuations, thereby reducing the safety and operation efficiency of the wind-solar-storage collaborative power grid. Therefore, the present invention detects the temperature of the transmission line while obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical perception data of the transmission line, and obtains the fluctuation state of the current and voltage of the transmission line based on the current fluctuation rate and voltage fluctuation rate, accurately obtaining the fluctuation state of the current and voltage of the transmission line, and judging whether the current and voltage of the transmission line are normal fluctuations or abnormal fluctuations, thereby improving the safety and operation efficiency of the wind-solar-storage collaborative power grid.
[0092] The process of issuing early warnings based on the fluctuation status of current and voltage and the temperature detection results of the transmission line includes:
[0093] When the temperature of the transmission line is abnormally high, the IoT circuit breaker in the transmission line is turned on, the transmission line is cut off, a red alert is issued, and relevant personnel are dispatched to deal with the cause of the abnormal high temperature of the transmission line;
[0094] When the temperature of the transmission line is in an abnormal temperature change state, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, a yellow warning is issued, and relevant personnel are dispatched to deal with it;
[0095] When the current fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, an orange warning is issued, and relevant personnel are dispatched to deal with it;
[0096] When the voltage fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is turned on, the transmission line is cut off, a blue warning is issued, and relevant personnel are dispatched to deal with it.
[0097] In this embodiment, it is determined whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and the temperature variation coefficient is obtained. It is determined whether the temperature of the transmission line is in an abnormally high temperature state based on the temperature variation coefficient. It is determined whether the temperature of the transmission line is abnormal based on the temperature of the internal conductor of the transmission line. The temperature abnormality of the transmission line is detected in advance, that is, the temperature abnormality of the transmission line can be detected in the first time, thereby improving the accuracy and efficiency of detection, avoiding the occurrence of safety accidents of the transmission line, improving the safety performance of the transmission line, and further improving the safety of the wind-solar-storage coordinated power grid; when the temperature of the transmission line is in an abnormally high temperature state, based on the external insulation temperature projection point, the ambient temperature projection point and the internal conductor high temperature projection point in the joint change line graph The reason why the temperature of the transmission line is in an abnormally high temperature state is obtained based on the positional relationship of the points. Relevant personnel carry out maintenance according to the reason for the abnormal high temperature state, which saves the time of obtaining the reason for the abnormal high temperature state, thereby reducing the maintenance time of the transmission line and improving the operation efficiency of the wind-solar-storage coordinated power grid; while detecting the temperature of the transmission line, the current fluctuation rate and voltage fluctuation rate of the transmission line are obtained based on the physical perception data of the transmission line, and the fluctuation state of the current and voltage of the transmission line is obtained based on the current fluctuation rate and voltage fluctuation rate, and the fluctuation state of the current and voltage of the transmission line is accurately obtained, and it is judged whether the current and voltage of the transmission line fluctuate normally or abnormally, thereby improving the safety and operation efficiency of the wind-solar-storage coordinated power grid.
[0098] Example 2
[0099] See also Figure 2 As shown, for the parts not described in detail in this embodiment, please refer to the description of Example 1, which provides an IoT circuit breaker multi-modal protection method for wind, solar and storage collaboration, including:
[0100] Step S1: Acquire physical sensing data and environmental parameter information data of the transmission lines in the wind-solar-storage coordinated power grid;
[0101] Step S2: Detecting the temperature of the transmission line during a monitoring period based on the physical sensing data and environmental parameter information data of the transmission line, establishing a joint change line graph, determining whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and obtaining a temperature variation coefficient, determining whether the temperature of the transmission line is in an abnormally high temperature state based on the temperature variation coefficient, and when the temperature of the transmission line is in an abnormally high temperature state, determining the reason why the temperature of the transmission line is in an abnormally high temperature state based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph;
[0102] Step S3: while detecting the temperature of the transmission line, obtaining the current fluctuation rate and the voltage fluctuation rate of the transmission line according to the physical sensing data of the transmission line, and obtaining the fluctuation state of the current and voltage of the transmission line according to the current fluctuation rate and the voltage fluctuation rate;
[0103] Step S4: issuing an early warning based on the fluctuation state of current and voltage and the temperature detection result of the transmission line.
[0104] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.
[0105] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only one type. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
[0106] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.
[0107] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. The IoT circuit breaker multimodal protection system for wind, solar and energy storage collaboration includes a multimodal protection center, which is characterized by: The multimodal protection center is communicatively connected to a multimodal sensing component, a temperature anomaly detection component, a fluctuation anomaly detection component, and an anomaly warning component; Multimodal perception component, responsible for acquiring physical perception data and environmental parameter information data of transmission lines in the wind, solar and storage coordinated power grid; The temperature anomaly detection component is responsible for detecting the temperature of the transmission line within the monitoring period based on the physical perception data and environmental parameter information data of the transmission line, establishing a joint change line graph, judging whether the temperature of the transmission line is in an abnormally high temperature state based on the joint change line graph, and obtaining the temperature variation coefficient. Based on the temperature variation coefficient, it is judged whether the temperature of the transmission line is in an abnormally high temperature state. When the temperature of the transmission line is in an abnormally high temperature state, the reason for the abnormally high temperature state of the transmission line is obtained based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph; The fluctuation anomaly detection component is responsible for detecting the temperature of the transmission line and obtaining the current fluctuation rate and voltage fluctuation rate of the transmission line based on the physical sensing data of the transmission line. It also obtains the fluctuation status of the current and voltage of the transmission line based on the current fluctuation rate and voltage fluctuation rate. The abnormal warning component is responsible for issuing warnings based on the fluctuation status of current and voltage and the temperature detection results of the transmission line.
2. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 1 is characterized in that: The physical sensing data includes the temperature, current and voltage of the transmission lines in the wind-solar-storage coordinated power grid; The temperature of the transmission line includes the temperature of the conductor inside the transmission line and the temperature of the insulation outside the transmission line, and the environmental parameter information data includes the ambient temperature of the transmission line in the wind, solar and energy storage coordinated power grid.
3. The multi-modal protection system for wind, solar and energy storage IoT circuit breakers according to claim 2 is characterized in that: The method for establishing a joint change line graph includes: The monitoring period is divided into k monitoring time points, and the internal conductor temperature of the transmission line, the external insulation temperature of the transmission line, and the ambient temperature of the transmission line at each monitoring time point are obtained; Establish a blank two-dimensional rectangular coordinate system, set the abscissa of the blank two-dimensional rectangular coordinate system to time, set the ordinate of the blank two-dimensional rectangular coordinate system to temperature, fill the internal conductor temperature of the transmission line, the external insulation temperature of the transmission line, and the ambient temperature of the transmission line at each monitoring time point into the blank two-dimensional rectangular coordinate system, and obtain the internal conductor temperature projection point, the external insulation temperature projection point, and the ambient temperature projection point at each monitoring time point; Draw a straight line in chronological order to connect the internal conductor temperature projection points in sequence, and highlight the internal conductor temperature projection points and the straight line connecting the internal conductor temperature projection points in red. Draw a straight line in chronological order to connect the external insulation temperature projection points in sequence, and highlight the external insulation temperature projection points and the straight line connecting the external insulation temperature projection points in orange. Draw a straight line in chronological order to connect the ambient temperature projection points in sequence, and highlight the ambient temperature projection points and the straight line connecting the ambient temperature projection points in green to obtain a joint change line graph.
4. The multi-modal protection system for wind, solar and energy storage IoT circuit breakers according to claim 3 is characterized in that: The method for determining whether the temperature of the transmission line is in an abnormally high temperature state based on the combined change line graph includes: A high temperature threshold is set, and the internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the high temperature threshold. The internal conductor temperature projection point corresponding to the internal conductor temperature greater than or equal to the high temperature threshold is obtained and recorded as the internal conductor high temperature projection point. The monitoring time point corresponding to the internal conductor high temperature projection point is recorded as the high temperature time point. At the high temperature time point, the temperature of the transmission line is in an abnormally high temperature state, and at a time point other than the high temperature time point, the temperature of the transmission line is not in an abnormally high temperature state.
5. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 4 is characterized in that: The method for obtaining the temperature variation coefficient includes: Starting from the second internal conductor temperature projection point, the internal conductor temperature corresponding to the internal conductor temperature projection point is compared with the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point. If the internal conductor temperature corresponding to the internal conductor temperature projection point is greater than the internal conductor temperature corresponding to the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point, the internal conductor temperature projection point is highlighted in purple until the last internal conductor temperature projection point is reached. Draw a line parallel to the horizontal axis through the internal conductor temperature projection point highlighted in purple, and record it as the first parallel line to be analyzed. Draw a line parallel to the horizontal axis through the previous internal conductor temperature projection point adjacent to the internal conductor temperature projection point highlighted in purple, and record it as the second parallel line to be analyzed. Obtain the shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed. Use the shortest perpendicular distance between the first parallel line to be analyzed and the second parallel line to be analyzed as the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple.
6. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 5 is characterized in that: The method for determining whether the temperature of the transmission line is in an abnormal temperature change state based on the temperature change coefficient includes: Set the temperature variation coefficient threshold. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is greater than or equal to the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is in a temperature variation abnormal state. When the temperature variation coefficient of the internal conductor temperature projection point highlighted in purple is less than the temperature variation coefficient threshold, the temperature of the transmission line at the monitoring time point corresponding to the purple highlighted internal conductor temperature projection point is not in a temperature variation abnormal state.
7. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 6 is characterized in that: The method for obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state based on the positional relationship between the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point in the joint change line graph includes: Extract the external insulation temperature projection point, the ambient temperature projection point, and the internal conductor high temperature projection point at the high temperature time point. If the internal conductor high temperature projection point at the high temperature time point is above the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: an internal fault in the transmission line. If the internal conductor high temperature projection point at the high temperature time point is below the external insulation temperature projection point, then the reason why the transmission line temperature is abnormally high at the high temperature time point is: the ambient temperature of the transmission line is too high. If the high temperature projection point of the internal conductor at the high temperature time point coincides with the external insulation temperature projection point, the reason why the temperature of the transmission line is in an abnormally high temperature state at the high temperature time point is obtained based on the positional relationship between the high temperature projection point of the internal conductor at the high temperature time point and the ambient temperature projection point.
8. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 7 is characterized in that: The method for obtaining the reason why the temperature of the transmission line is in an abnormally high temperature state at the high temperature time point based on the positional relationship between the high temperature projection point of the internal conductor and the ambient temperature projection point at the high temperature time point includes: If the high-temperature projection point of the internal conductor at the high-temperature time point is above the ambient temperature projection point, then the reason why the temperature of the transmission line is in an abnormally high temperature state at the high-temperature time point is: an internal fault of the transmission line; if the high-temperature projection point of the internal conductor at the high-temperature time point is below the ambient temperature projection point, then the reason why the temperature of the transmission line is in an abnormally high temperature state at the high-temperature time point is: the ambient temperature of the transmission line is too high; If the high temperature projection point of the internal conductor at the high temperature time point coincides with the ambient temperature projection point, the reason why the temperature of the transmission line at the high temperature time point is in an abnormally high temperature state is: an internal fault in the transmission line or the ambient temperature of the transmission line is too high.
9. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 8 is characterized in that: The method of detecting the temperature of the transmission line while obtaining the current fluctuation rate and the voltage fluctuation rate of the transmission line according to the physical sensing data of the transmission line, and obtaining the fluctuation state of the current and voltage of the transmission line according to the current fluctuation rate and the voltage fluctuation rate includes: The current and voltage of the transmission line during the monitoring period are sampled separately, with a sampling frequency of P Hz, to obtain the current sequence I and voltage sequence U respectively; Where, I={I0,I1,I2,……,I n―1 }, U={U0,U1,U2,……,U n―1 }; I0, I1, I2, ..., I n―1 are the current samples obtained by sampling the current of the transmission line, U0, U1, U2, ..., U n―1 is the voltage sample obtained by sampling the voltage of the transmission line, and n is the number of current samples and voltage samples; Obtain the current fluctuation rate LB of the transmission line according to the current sequence i ; in, i is the index of current fluctuation rate, i=1,2,3……,n―1,LB i is the current fluctuation rate of the i-th transmission line, I i is the i-th current sample, I i―1 is the previous current sample of the i-th current sample, Δt is the sampling interval, A current fluctuation rate threshold is set. When the current fluctuation rate of the transmission line is greater than the current fluctuation rate threshold, the current fluctuation state of the transmission line is an abnormal fluctuation state. When the current fluctuation rate of the transmission line is less than or equal to the current fluctuation rate threshold, the current fluctuation state of the transmission line is a normal fluctuation state. Obtain the voltage fluctuation rate YB of the transmission line according to the voltage sequence j ; in, j is the index of voltage fluctuation rate, j=1,2,3……,n―1,YB j is the jth voltage fluctuation rate of the transmission line, U j is the jth voltage sample, U j―1 is the previous voltage sample of the j-th voltage sample; A voltage fluctuation rate threshold is set. When the voltage fluctuation rate of the transmission line is greater than the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is an abnormal fluctuation state. When the voltage fluctuation rate of the transmission line is less than or equal to the voltage fluctuation rate threshold, the voltage fluctuation state of the transmission line is a normal fluctuation state.
10. The multi-modal protection system for wind, solar and energy storage synergy based on the Internet of Things circuit breaker according to claim 9 is characterized in that: The method for providing early warning based on the fluctuation state of current and voltage and the temperature detection result of the transmission line includes: When the temperature of the transmission line is abnormally high, the IoT circuit breaker in the transmission line is turned on, the transmission line is cut off, a red alert is issued, and relevant personnel are dispatched to deal with the cause of the abnormal high temperature of the transmission line; When the temperature of the transmission line is in an abnormal temperature change state, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, a yellow warning is issued, and relevant personnel are dispatched to deal with it; When the current fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is opened, the transmission line is cut off, an orange warning is issued, and relevant personnel are dispatched to deal with it; When the voltage fluctuation state of the transmission line is abnormal, the IoT circuit breaker in the transmission line is turned on to cut off the transmission line, issue a blue warning, and dispatch relevant personnel to deal with it.
Citation Information
Patent Citations
Power transmission line safety monitoring system based on Internet
CN117559656A