A fast AC ice melting system for collector lines

Abstract

The present application relates to the technical field of line de-icing, and specifically to a rapid AC de-icing system for collector lines. The system includes: an de-icing data acquisition module, which is used to collect the temperature, humidity and wind speed at each collection time on the collector line, and obtain the line temperature information sequence, line humidity information sequence and line wind speed information sequence; an de-icing pre-processing module, which is used to determine the ice characteristic value at each collection time; based on the temperature and wind speed distribution at the adjacent collection time of each collection time, determine the cold wind characteristic value at each collection time; determine the cold wind change intensity, ice gain coefficient and line ice significant value at each collection time; AC de-icing module, which is used to monitor the ice on the collector line according to the line ice significant value at all collection times, and perform de-icing on the collector line. The present application aims to improve the efficiency of de-icing on the collector line.

Description

Technical Field

[0001] The present application relates to the technical field of line de-icing, and in particular to a rapid AC de-icing system for a collector line. Background Art

[0002] Usually, wind farms are often distributed in high-altitude mountain tops, valley mouths and other areas with abundant wind resources. Due to the influence of meteorology, terrain, temperature, humidity, cold and warm air convection, circulation and wind factors, the collector lines in wind farms are very prone to ice coverage. The severity of ice coverage is far greater than that of the main grid lines, which can easily cause the collector lines to break due to ice coverage, resulting in the collector lines being unable to work normally.

[0003] In order to ensure the safe and stable operation of the collector line, it is necessary to effectively de-ice the collector line during operation to reduce the impact of icing on the collector line. At present, line ice melting is the most effective means to deal with line icing, which effectively ensures the safe and stable operation of the large power grid under icing in winter.

[0004] However, the traditional line de-icing technology still has certain defects. For example, when using AC de-icing technology to de-ice the line, due to the complexity of the de-icing operation and the difficulty in determining the time point when the collector line is covered with ice, the de-icing time node is delayed, resulting in problems such as unsatisfactory de-icing effect or too long de-icing time, resulting in low de-icing efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of this application is to provide a collector line rapid AC ice melting system, and the technical solutions adopted are as follows:

[0006] The present application proposes a collector line rapid AC ice melting system, the system comprising:

[0007] The ice melting data acquisition module is used to collect the temperature, humidity and wind speed on the collector line at each collection time, and obtain the line temperature information sequence, line humidity information sequence and line wind speed information sequence;

[0008] An ice melting preprocessing module is used to determine the ice covering characteristic value at each collection time based on the temperature change trend, humidity average level and wind speed average level of each collection time at adjacent collection times in the three sequences, for the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence;

[0009] Determine the cold wind characteristic value at each collection time based on the temperature and wind speed distribution at adjacent collection times at each collection time;

[0010] Determine the intensity of cold wind change at each collection moment based on the change of cold wind characteristic values ​​at adjacent collection moments at each collection moment;

[0011] Based on the intensity of cold wind changes at each collection time and the extreme difference of ice characteristic values ​​at adjacent collection times, the ice gain coefficient at each collection time is determined;

[0012] Based on the ice characteristic value and ice gain coefficient at each collection time, determine the line ice significance value at each collection time;

[0013] The AC ice-melting module is used to monitor the ice coverage of the collector line according to the line ice coverage significance value at all collection moments and to melt the ice on the collector line.

[0014] In one embodiment, the process of determining the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence is as follows:

[0015] The temperature, humidity and wind speed at all acquisition moments are normalized respectively, and the normalized temperature, humidity and wind speed at all acquisition moments are arranged in time series to form a line temperature sequence, a line humidity sequence and a line wind speed sequence respectively, and the line temperature sequence, the line humidity sequence and the line wind speed sequence are filtered respectively to obtain a line temperature information sequence, a line humidity information sequence and a line wind speed information sequence.

[0016] In one embodiment, the process of determining the ice coverage characteristic value is as follows:

[0017] A window of preset size is constructed with the temperature at each acquisition time in the line temperature information sequence as the center, and the temperatures at all acquisition times in the window are arranged in time sequence to form an ice cover temperature feature sequence at each acquisition time;

[0018] For humidity and wind speed, the same construction method of ice-covered temperature characteristic sequence is adopted to obtain the ice-covered humidity characteristic sequence and ice-covered wind speed characteristic sequence at each collection time;

[0019] Detrending fluctuation analysis method is used to perform detrending processing on each ice-covering temperature characteristic sequence to obtain each ice-covering temperature characteristic detrended sequence, and the data difference between each ice-covering temperature characteristic sequence and the corresponding ice-covering temperature characteristic detrended sequence at the same collection time is calculated, and all the data differences of each ice-covering temperature characteristic sequence are arranged in time series to form an ice-covering temperature trend sequence at each collection time;

[0020] Based on the change of data in the ice cover temperature trend sequence at each collection time, determine the temperature change value at each collection time;

[0021] Calculate the mean of all data in the ice-covered humidity characteristic sequence and the ice-covered wind speed characteristic sequence at each collection time, and record them as the first humidity mean and the first wind speed mean;

[0022] Based on the temperature change value at each collection moment, the first humidity average value and the first wind speed average value, an ice cover characteristic value at each collection moment is determined.

[0023] In one embodiment, the process of determining the temperature change value is:

[0024] The normalized value of the difference between the first data and the last data in the ice cover temperature trend sequence at each collection moment is taken as the temperature change value at each collection moment.

[0025] In one embodiment, the products of the temperature change value at each collection moment and the first humidity average value and the first wind speed average value are calculated, and the sum of the products is used as the ice cover characteristic value at each collection moment.

[0026] In one embodiment, the process of determining the cold wind characteristic value is as follows:

[0027] The time period of the preset neighborhood radius centered at each collection moment is used as the local time period of each collection moment;

[0028] Calculate the data mean of all collection moments in the local time period of each collection moment in the line temperature information sequence and the line wind speed information sequence respectively, and record them as the second temperature mean and the second wind speed mean;

[0029] The cumulative sum of the second temperature mean and a preset error parameter greater than 0 is calculated, and the ratio of the second wind speed mean at each collection moment to the cumulative sum is used as the cold wind characteristic value at each collection moment.

[0030] In one embodiment, the process of determining the intensity of the cold wind change is as follows:

[0031] Calculate the absolute value of the difference between the cold wind characteristic value at each collection moment and the adjacent previous collection moment in the local time period of any collection moment, and take the average of all the absolute values ​​of the difference corresponding to any collection moment as the cold wind change intensity at any collection moment.

[0032] In one embodiment, the process of determining the ice gain coefficient is as follows:

[0033] The range of ice characteristic values ​​at all collection moments within the local time period of any collection moment is calculated, and the normalized value of the product of the cold wind change intensity at any collection moment and the range is used as the ice gain coefficient at any collection moment.

[0034] In one embodiment, the process of determining the line ice coverage significance value by the ice melting preprocessing module is as follows:

[0035] The accumulated value of the calculated value 1 and the ice gain coefficient at each collection time is used as the product of the accumulated value and the ice characteristic value at each collection time as the line ice significance value at each collection time.

[0036] In one embodiment, the ice melting process of the AC ice melting module is implemented as follows:

[0037] The threshold segmentation algorithm is used to obtain the judgment threshold of the line ice coverage significance value at all acquisition moments. When the line ice coverage significance value is greater than the judgment threshold, it indicates that the collector line is iced; otherwise, it indicates that the collector line is not iced.

[0038] An ice-melting incoming line isolating switch is set in the AC ice-melting module. If ice covering occurs, the ice-melting incoming line isolating switch is closed and the AC ice-melting technology is used to melt the ice on the collector line.

[0039] This application has the following beneficial effects:

[0040] Based on the analysis of the degree of ice on the collector line, the ice characteristic value is determined to reflect the degree of ice on the collector line at different collection times;

[0041] Based on the analysis of the gain effect of ice on the collector line, the ice gain coefficient is determined to reflect the influence of ice gain on the collector line at different acquisition times.

[0042] Based on the icing characteristic value and icing gain coefficient, the line icing significance value is determined to reflect the significance of icing on the collector line at different collection times.

[0043] Based on the line icing significance value, real-time monitoring is performed on whether icing occurs at the current moment, and then the AC ice melting technology is used to melt the ice on the collector line to avoid the impact on the collector line caused by the delay in ice melting. The present application improves the efficiency of ice melting on the collector line by detecting the time point when icing occurs on the collector line. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A block diagram of a collector line rapid AC ice melting system provided in one embodiment of the present application;

[0046] Figure 2 It is a schematic diagram of the process of determining the characteristic value of ice cover;

[0047] Figure 3 It is a schematic diagram of the process of determining the characteristic value of cold wind;

[0048] Figure 4 A schematic diagram of the process of obtaining the significant value of ice coverage on the line;

[0049] Figure 5 This is a schematic diagram of the ice melting process for the collector line. DETAILED DESCRIPTION

[0050] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific implementation method, structure, features and effects of a collector line rapid AC ice melting system proposed in the present application are described in detail below in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0051] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0052] The specific scheme of a collector line rapid AC ice melting system provided by the present application is described in detail below with reference to the accompanying drawings.

[0053] See also Figure 1 , which shows a block diagram of a collector line rapid AC ice melting system provided by an embodiment of the present application, the system includes: an ice melting data acquisition module 101, an ice melting preprocessing module 102, and an AC ice melting module 103.

[0054] The ice melting data collection module 101 is used to collect the temperature, humidity and wind speed on the collector line at each collection time, and obtain the line temperature information sequence, line humidity information sequence and line wind speed information sequence.

[0055] The purpose of this embodiment is to accurately determine the time point when ice coating occurs on the collector circuit, so as to timely perform AC ice melting treatment on the collector circuit, thereby improving the efficiency of ice melting treatment on the collector circuit.

[0056] This embodiment uses a multifunctional sensor to collect the temperature, humidity and wind speed on the collector circuit. The multifunctional sensor is a multifunctional sensor that integrates a temperature sensor, a humidity sensor and a wind speed sensor.

[0057] In one embodiment of the present application, when collecting temperature, humidity and wind speed, the collection time interval in this embodiment is 0.2s and the collection time length is 10min. As other implementation methods, the implementer can decide the collection time interval and the collection time length according to the actual situation.

[0058] In order to facilitate the subsequent analysis of icing on the collector line and improve the accuracy of the analysis of icing on the collector line, all the collected temperatures, humidity and wind speeds are subjected to Z-score normalization processing respectively, and the normalized temperatures, humidity and wind speeds are arranged in time series to form a line temperature sequence, a line humidity sequence and a line wind speed sequence respectively. The line temperature sequence, the line humidity sequence and the line wind speed sequence are used as inputs of the Kalman filter algorithm respectively, and the outputs are respectively a line temperature information sequence, a line humidity information sequence and a line wind speed information sequence, wherein the Z-score normalization processing and the Kalman filter algorithm are both well-known technologies, and the specific process will not be repeated here.

[0059] At this point, a line parameter information sequence is obtained, and the line parameter information sequence includes a line temperature information sequence, a line humidity information sequence, and a line wind speed information sequence.

[0060] The ice melting preprocessing module 102 determines the ice characteristic value, cold wind characteristic value, cold wind change intensity, ice gain coefficient and line ice significance value at each collection time according to the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence.

[0061] Generally, the severity of ice on the collector line is greatly affected by environmental factors. The greater the severity of ice, the clearer the ice characteristics. At the same time, when the temperature is lower, the humidity is higher, and the wind speed is higher, the collector line is more likely to be iced. In order to improve the efficiency of ice melting on the collector line, it is necessary to analyze the clarity of the ice characteristics on the collector line.

[0062] Sub-step 1 is used to determine the ice characteristic value at each collection time based on the temperature change trend, humidity average level and wind speed average level of adjacent collection times at each collection time in the three sequences, for the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence.

[0063] Specifically, in one embodiment of the present application, for each line parameter information sequence, a window of size 1×51 is set as a sliding window of each collection moment with the data at each collection moment in the line parameter information sequence as the center, and the data of all collection moments in the sliding window of each collection moment are arranged in time series to form an icing parameter feature sequence of each collection moment, and the icing parameter feature sequence includes an icing temperature feature sequence, an icing humidity feature sequence and an icing wind speed feature sequence.

[0064] It should be understood that the selected 1×51 window size is only an embodiment of the present application. On the basis of constructing a sliding window of a preset size centered on the data at each acquisition moment, the implementer can select a window of a preset size according to actual conditions.

[0065] In order to more accurately analyze the trend change of the ice-covered temperature feature sequence, the ice-covered temperature feature sequence at each acquisition time in the line temperature information sequence is used as the input of the detrended fluctuation analysis method (Detrended Fluctuation Analysis, DFA), and each ice-covered temperature feature detrended sequence is output, and the data difference between each ice-covered temperature feature sequence and the same acquisition time in the corresponding ice-covered temperature feature detrended sequence is calculated, and all the data differences of each ice-covered temperature feature sequence are arranged in time sequence to form an ice-covered temperature trend sequence at each acquisition time in the line temperature information sequence. Among them, the DFA method is a well-known technology, and the specific process is not repeated here.

[0066] The process of determining the ice cover characteristic value at each collection time is as follows:

[0067] The normalized value of the difference between the first data and the last data in the ice cover temperature trend sequence at each collection time in the line temperature information sequence is used as the temperature change value at each collection time;

[0068] Calculate the mean of all data in the ice-covered humidity feature sequence at each collection time in the line humidity information sequence, and record it as the first humidity mean; calculate the mean of all data in the ice-covered wind speed feature sequence at each collection time in the line wind speed information sequence, and record it as the first wind speed mean;

[0069] The products of the temperature change value at each collection moment and the first humidity average value and the first wind speed average value are calculated, and the sum of the products is used as the ice cover characteristic value at each collection moment.

[0070] It should be noted that the greater the difference between the first data and the last data in the ice temperature trend sequence, the greater the trend of temperature drop on the collector line, which indicates that the collector line is in a low temperature environment for a long time. That is, the greater the change characteristic of temperature drop, the more likely the line is iced, and the greater the temperature change value;

[0071] At the same time, the greater the temperature change value and the greater the mean of all data in the icing humidity characteristic sequence, the more likely it is that the temperature on the collector line drops sharply and the humidity is high, and the line is more likely to be covered with ice; at the same time, the greater the temperature change value and the greater the mean of all data in the icing wind speed characteristic sequence, the more likely it is that the temperature on the collector line drops sharply and the wind speed is high, which is more conducive to the generation of icing on the collector line, and the greater the icing characteristic value. The schematic diagram of the determination process of the icing characteristic value is as follows: Figure 2 shown.

[0072] Based on the above analysis, the ice characteristic value at each collection time is obtained, which reflects the degree of ice characteristics on the collector line at different collection times. The larger the ice characteristic value, the deeper the ice characteristics on the collector line at this time, that is, the more obvious the ice characteristics on the collector line are.

[0073] Sub-step 2: determining the ice gain coefficient at each collection time based on the temperature and wind speed distribution at adjacent collection times and the range of ice characteristic values ​​at adjacent collection times.

[0074] Furthermore, the greater the change in the ice characteristic value in the adjacent time period of a certain collection moment, the stronger the gain effect of environmental changes on the ice phenomenon of the collector line. Even if the temperature on the collector line does not reach the condensation temperature of ice, there is a greater possibility of ice on the collector line. In addition, when the temperature on the collector line is low, the faster the wind speed changes, the faster the change of cold wind, which is more conducive to the rapid condensation of water vapor in the air, thereby causing ice on the collector line, that is, the stronger the gain on ice on the collector line.

[0075] 2.1 Based on the temperature and wind speed distribution at adjacent collection times at each collection time, determine the cold wind characteristic value at each collection time.

[0076] In order to analyze the influence of ice gain on the collector line at different collection times, a time period with a neighborhood radius of 20s is set as the local time period of each collection time, with each collection time as the center.

[0077] It should be understood that the selected time period with a neighborhood radius of 20s is only an embodiment of the present application. On the basis of constructing a local time period of a preset size centered on each acquisition moment, the implementer can select the neighborhood radius of the time period according to actual conditions.

[0078] The data of all collection moments in the local time period of each collection moment in the line temperature information sequence are arranged in time sequence to form a line temperature local sequence of each collection moment; the data of all collection moments in the local time period of each collection moment in the line wind speed information sequence are arranged in time sequence to form a line wind speed local sequence of each collection moment.

[0079] The calculation formula of the cold wind characteristic value at each collection time is:

[0080]

[0081] In the formula, Q i is the cold wind characteristic value at the i-th collection moment, and are respectively the means of the elements in the local sequence of line wind speed and the local sequence of line temperature at the ith collection moment, ∈ is an error parameter preset to be greater than 0, the purpose of which is to avoid the denominator being 0. The value of the error parameter is preset manually and can be set by the implementer. In one embodiment of the present application, the error parameter is 1.

[0082] It should be noted that the element mean The bigger and The smaller it is, the higher the wind speed and lower the temperature on the collector circuit. The larger the cold wind characteristic value is. Figure 3 shown.

[0083] 2.2 Based on the change of the cold wind characteristic value at each collection time adjacent to the collection time, the cold wind change intensity at each collection time is determined.

[0084] Calculate the absolute value of the difference between the cold wind characteristic value at each collection moment and the adjacent previous collection moment in the local time period of any collection moment, and take the average of all the absolute values ​​of the difference corresponding to any collection moment as the cold wind change intensity at any collection moment.

[0085] Among them, when the collection time is the first collection time in the local time period, the absolute value of the difference between it and the cold wind characteristic value at the adjacent previous collection time is not calculated.

[0086] It should be noted that: when the absolute value of the difference between the cold wind characteristic values ​​at adjacent collection moments is larger, it means that the intensity of cold wind change in the local time period is higher, which is more conducive to the rapid condensation of water vapor in the air, thereby causing icing on the collector line, that is, the greater the gain effect on icing on the collector line at this time.

[0087] 2.3 Based on the intensity of cold wind changes at each collection time and combined with the extreme difference of ice characteristic values ​​at adjacent collection times, the ice gain coefficient at each collection time is determined.

[0088] The range of ice characteristic values ​​at all collection moments within the local time period of any collection moment is calculated, and the normalized value of the product of the cold wind change intensity at any collection moment and the range is used as the ice gain coefficient at any collection moment.

[0089] It should be noted that the larger the range of the icing characteristic value, the greater the change in the icing characteristics on the collector line caused by the environment. At this time, the stronger the gain effect of the environment on the icing of the collector line, the larger the icing gain coefficient at this time.

[0090] Sub-step 3: determining the line ice significance value at each collection time based on the ice characteristic value and ice gain coefficient at each collection time.

[0091] Furthermore, based on the icing characteristic value and the icing gain coefficient, the line icing significance value at each collection time is calculated to reflect the significance of icing on the collector line at different collection times. The specific process is as follows:

[0092] The accumulated value of the calculated value 1 and the ice gain coefficient at each collection time is used as the product of the accumulated value and the ice characteristic value at each collection time as the line ice significance value at each collection time.

[0093] It should be noted that: the larger the ice characteristic value and the larger the ice gain coefficient, the clearer the ice characteristic on the collector line, and the greater the gain effect of the environment on the collector line ice at this time. The more significant the ice phenomenon on the collector line is, the greater the line ice significance value is. The schematic diagram of the process of obtaining the line ice significance value is as follows: Figure 4 shown.

[0094] The AC ice-melting module 103 is used to monitor ice coverage on the collector line according to the line ice coverage significance value at all collection moments, and to perform ice-melting processing on the collector line.

[0095] Furthermore, since there is a large difference between when the line is iced and when the line is normal, in order to accurately determine the time point when ice appears on the collector line, the line ice significance values ​​at all acquisition moments are used as the input of the threshold segmentation algorithm, and the output of the threshold segmentation algorithm is used as the judgment threshold of the line ice significance value.

[0096] In one embodiment of the present application, the maximum inter-class variance algorithm is used to obtain the judgment threshold of the line icing significance value. As other implementation methods, the implementer may also use other existing technologies to obtain the judgment threshold of the line icing significance value, and the present application does not impose any special restrictions.

[0097] If the current line ice coverage value is greater than the judgment threshold, it means that ice is present on the collector line at this moment. At this time, AC ice melting technology is needed to perform AC ice melting on the collector line to improve the efficiency of ice melting. If the current line ice coverage value is less than or equal to the judgment threshold, it means that there is no ice on the collector line at this moment, and ice melting is not required. The schematic diagram of the collector line ice melting process is as follows: Figure 5 shown.

[0098] The AC ice-melting treatment equipment includes an incoming power supply cabinet, a complete set of AC ice-melting devices, ice-melting input and output cables, an ice-melting incoming line isolating switch, an ice-melting upper line isolating switch, a measurement and protection system, and an ice-melting short-circuit switch; the incoming power supply cabinet, the complete set of AC ice-melting systems, and the lines to be ice-melted are arranged in sequence according to the electrical connection sequence, the incoming power supply cabinet is located in the low-voltage distribution room of the booster station, the incoming power supply cabinet and the complete set of AC ice-melting devices are connected through the ice-melting input cable to achieve current flow, and the complete set of AC ice-melting devices and the lines to be ice-melted are connected through the ice-melting output cable to achieve current flow.

[0099] An ice-melting inlet disconnector is installed at the inlet of the complete set of AC ice-melting devices as an obvious disconnection point for the inspection and maintenance of the complete set of AC ice-melting devices. The outlet of the complete set of AC ice-melting devices is connected to the ice-melting upper line disconnector through a cable, one group per collector line, and then connected to the overhead line through the cable tower. When melting ice, only the ice-melting disconnector of the collector line to be melted is closed to achieve the connection between the ice-melting device and the line, reducing the workload during ice melting and improving ice melting efficiency.

[0100] In order to prevent the de-icing voltage from entering the wind turbine and causing the wind turbine to operate at low voltage, the wind turbine converter needs to be remotely disconnected during the de-icing process. If the existing wind turbine converter in the wind farm does not have a low-voltage disconnection function, an additional low-voltage trip switch needs to be added or manually opened. At the same time, a new set of de-icing short-circuit switches needs to be built at the end of each collector line to form an de-icing circuit.

[0101] During ice melting, the power supply of the entire line to be melted will be cut off, and the relevant line equipment will be shut down, and preparations will be made to put the rapid AC ice melting system into use. First, the ice melting incoming line isolation switch and ice melting short-circuit switch will be placed in the closed position, and the ice melting upper line switch corresponding to the line to be melted will be closed to form a complete ice melting circuit. Next, the complete ice melting system will be set to the corresponding output state, and finally the incoming power cabinet will be closed, and the collector line rapid AC ice melting system will be powered on to melt the ice.

[0102] At this point, rapid AC ice-thawing of the collector line is achieved.

[0103] It should be noted that the sequence of the above embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0105] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. A collector line rapid AC ice melting system, characterized in that: The system comprises: The ice melting data acquisition module is used to collect the temperature, humidity and wind speed at each collection time on the collector line, and obtain the line temperature information sequence, line humidity information sequence and line wind speed information sequence; An ice melting preprocessing module is used to determine the ice covering characteristic value at each collection time based on the temperature change trend, humidity average level and wind speed average level of each collection time at adjacent collection times in the three sequences, for the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence; Determine the cold wind characteristic value at each collection time based on the temperature and wind speed distribution at adjacent collection times at each collection time; Determine the cold wind change intensity at each collection moment based on the change of the cold wind characteristic value at adjacent collection moments at each collection moment; Based on the intensity of cold wind changes at each collection time and the extreme difference of ice characteristic values ​​at adjacent collection times, the ice gain coefficient at each collection time is determined; Based on the ice characteristic value and ice gain coefficient at each collection time, determine the line ice significance value at each collection time; The AC ice-melting module is used to monitor the ice coverage of the collector line according to the line ice coverage significance value at all collection moments and to melt the ice on the collector line.

2. A collector line rapid AC ice melting system according to claim 1, characterized in that: The determination process of the line temperature information sequence, the line humidity information sequence and the line wind speed information sequence is as follows: The temperature, humidity and wind speed at all acquisition moments are normalized respectively, and the normalized temperature, humidity and wind speed at all acquisition moments are arranged in time series to form a line temperature sequence, a line humidity sequence and a line wind speed sequence respectively, and the line temperature sequence, the line humidity sequence and the line wind speed sequence are filtered respectively to obtain a line temperature information sequence, a line humidity information sequence and a line wind speed information sequence.

3. A collector line rapid AC ice melting system according to claim 1, characterized in that: The process of determining the ice cover characteristic value is as follows: A window of preset size is constructed with the temperature at each acquisition time in the line temperature information sequence as the center, and the temperatures at all acquisition times in the window are arranged in time sequence to form an ice cover temperature feature sequence at each acquisition time; For humidity and wind speed, the same construction method of ice-covered temperature characteristic sequence is adopted to obtain the ice-covered humidity characteristic sequence and ice-covered wind speed characteristic sequence at each collection time; Detrending fluctuation analysis method is used to perform detrending processing on each ice-covering temperature characteristic sequence to obtain each ice-covering temperature characteristic detrended sequence, and the data difference between each ice-covering temperature characteristic sequence and the corresponding ice-covering temperature characteristic detrended sequence at the same collection time is calculated, and all the data differences of each ice-covering temperature characteristic sequence are arranged in time series to form an ice-covering temperature trend sequence at each collection time; Based on the change of data in the ice cover temperature trend sequence at each collection time, determine the temperature change value at each collection time; Calculate the mean of all data in the ice-covered humidity characteristic sequence and the ice-covered wind speed characteristic sequence at each collection time, and record them as the first humidity mean and the first wind speed mean; Based on the temperature change value at each collection moment, the first humidity average value and the first wind speed average value, an ice cover characteristic value at each collection moment is determined.

4. A collector line rapid AC ice melting system according to claim 3, characterized in that: The process of determining the temperature change value is as follows: The normalized value of the difference between the first data and the last data in the ice cover temperature trend sequence at each collection moment is taken as the temperature change value at each collection moment.

5. The collector line rapid AC ice melting system according to claim 3, characterized in that: The products of the temperature change value at each collection moment and the first humidity average value and the first wind speed average value are calculated, and the sum of the products is used as the ice cover characteristic value at each collection moment.

6. The collector line rapid AC ice melting system according to claim 1, characterized in that: The process of determining the cold wind characteristic value is as follows: The time period of the preset neighborhood radius centered at each collection moment is used as the local time period of each collection moment; Calculate the data mean of all collection moments in the local time period of each collection moment in the line temperature information sequence and the line wind speed information sequence respectively, and record them as the second temperature mean and the second wind speed mean; The cumulative sum of the second temperature mean and a preset error parameter greater than 0 is calculated, and the ratio of the second wind speed mean at each collection moment to the cumulative sum is used as the cold wind characteristic value at each collection moment.

7. A collector line rapid AC ice melting system according to claim 6, characterized in that: The process of determining the intensity of the cold wind change is as follows: Calculate the absolute value of the difference between the cold wind characteristic value at each collection moment and the adjacent previous collection moment in the local time period of any collection moment, and take the average of all the absolute values ​​of the difference corresponding to any collection moment as the cold wind change intensity at any collection moment.

8. The collector line rapid AC ice melting system according to claim 6, characterized in that: The determination process of the ice gain coefficient is: The range of ice characteristic values ​​at all collection moments within the local time period of any collection moment is calculated, and the normalized value of the product of the cold wind change intensity at any collection moment and the range is used as the ice gain coefficient at any collection moment.

9. The collector line rapid AC ice melting system according to claim 1, characterized in that: The process of determining the line icing significance value by the ice melting preprocessing module is as follows: The accumulated value of the calculated value 1 and the ice gain coefficient at each collection time is used as the product of the accumulated value and the ice characteristic value at each collection time as the line ice significance value at each collection time.

10. The collector line rapid AC ice melting system according to claim 1, characterized in that: The ice melting process of the AC ice melting module is as follows: The threshold segmentation algorithm is used to obtain the judgment threshold of the line ice coverage significance value at all acquisition moments. When the line ice coverage significance value is greater than the judgment threshold, it indicates that the collector line is iced; otherwise, it indicates that the collector line is not iced. An ice-melting incoming line isolating switch is set in the AC ice-melting module. If ice covering occurs, the ice-melting incoming line isolating switch is closed and the AC ice-melting technology is used to melt the ice on the collector line.

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