Anti-interference relay protection method and device

Abstract

The invention relates to the technical field of relay protection, and particularly discloses an anti-interference relay protection method and device, and the method comprises the following steps: 1, monitoring the current of a relay protection device, and obtaining abnormal data in a monitoring period; 2, calculating an abnormal coefficient based on the abnormal data; 3, based on the abnormal coefficient, evaluating whether the relay protection device is interfered or not, and generating an evaluation signal; 4, regulating and controlling the duration of the monitoring period based on the interference early warning signal; according to the invention, through multi-dimensional monitoring analysis, the accuracy and timeliness of fault detection of the relay protection device are effectively improved; according to the method, the time length of the monitoring period is intelligently adjusted, accurate and efficient monitoring of the current state of the relay protection device is achieved, the risk of potential interference or faults is effectively reduced, and a powerful guarantee is provided for stable operation of a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection, and in particular to an anti-interference relay protection method and device. Background Art

[0002] When a power component (such as a generator, line, etc.) or the power system itself fails and endangers the safe operation of the power system, it can send a warning signal to the operating personnel on duty in time, or directly send a tripping command to the controlled circuit breaker to stop the development of these events. The complete set of equipment that realizes this automation measure is generally called a relay protection device.

[0003] Since microelectronic devices are widely used in relay protection devices, these devices are extremely sensitive to electromagnetic interference, which can easily cause the protection device to malfunction or refuse to operate, seriously affecting the safety and stability of the power grid. However, in the existing technology, the monitoring of interference by relay protection devices is often unable to be monitored and analyzed from multiple dimensions, resulting in low accuracy of monitoring data and inability to intelligently control the duration of the monitoring cycle, thereby more timely and accurately detecting potential interference or faults. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-interference relay protection method and device to solve the technical problems in the above background.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides an anti-interference relay protection method, comprising the following steps:

[0007] Step 1: Monitor the current of the relay protection device and obtain abnormal data within the monitoring period;

[0008] Among them, the abnormal data include: abnormal degree coefficient and abnormal duration coefficient;

[0009] Step 2: Calculate the abnormal coefficient based on the abnormal data;

[0010] Step 3: Based on the abnormal coefficient, evaluate whether the relay protection device is disturbed and generate an evaluation signal;

[0011] Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal;

[0012] Step 4: Based on the interference warning signal, adjust the duration of the monitoring period.

[0013] As a further solution of the present invention: the process of obtaining abnormal data is:

[0014] During the monitoring period, the current of the relay protection device is monitored in real time to obtain the real-time current;

[0015] Based on a two-dimensional coordinate system with time as the X-axis and real-time current as the Y-axis, a curve is drawn to obtain a current change curve; at the same time, the real-time preset current within the monitoring period is preset to obtain a preset current curve;

[0016] The current change curve and the preset current curve are analyzed to obtain the abnormal degree coefficient and the abnormal duration coefficient respectively.

[0017] As a further solution of the present invention: the process of obtaining the abnormal degree coefficient is:

[0018] Based on the current change curve and the preset current curve, extract the non-overlapping portion between the current change curve and the preset current curve, and mark the time period where the non-overlapping portion is located as an abnormal period;

[0019] Obtain the abnormal representation ratio and abnormal floating ratio of each abnormal period respectively;

[0020] At the same time, based on the number of abnormal time periods in the monitoring period, the ratio of the number of abnormal time periods is obtained;

[0021] By formula: Calculate the abnormality degree coefficient CD, where a1, a2, and a3 are preset proportional factors, and all are greater than 0. i represents the i-th abnormal period in the monitoring period, and the value of i is 1, 2, 3, ..., N, where N is the total number of abnormal periods, NB is the ratio of the number of abnormal periods, BB is the abnormal characterization ratio, and FB is the abnormal floating ratio.

[0022] As a further solution of the present invention: the process of obtaining the abnormal characterization ratio is:

[0023] Based on any abnormal time period, respectively extract the length of the current change curve and the preset current curve in the abnormal time period to obtain the current change characterization value and the preset current characterization value;

[0024] Calculate the difference between the current change characterization value and the preset current characterization value to obtain an abnormal characterization value, and calculate the ratio between the abnormal characterization value and the preset current characterization value to obtain an abnormal characterization ratio;

[0025] The process of obtaining the abnormal floating ratio is as follows:

[0026] Based on any abnormal period, extract the area of ​​the region enclosed by the current change curve in the abnormal period and the preset current curve to obtain the abnormal floating value, calculate the ratio of the abnormal floating value to the abnormal floating threshold, and obtain the abnormal floating ratio;

[0027] The process of obtaining the abnormal period quantity ratio is as follows:

[0028] The number of abnormal time periods in the monitoring period is extracted to obtain the total number of abnormal time periods, and the total number of abnormal time periods is calculated to be proportional to the threshold value of the number of abnormal time periods to obtain the ratio of the number of abnormal time periods.

[0029] As a further solution of the present invention: the process of obtaining the abnormal duration coefficient is:

[0030] The total duration of all abnormal periods is extracted to obtain the total abnormal duration, and the ratio of the total abnormal duration to the monitoring period duration is calculated to obtain the abnormal duration coefficient.

[0031] As a further solution of the present invention: the process of obtaining the abnormal coefficient is:

[0032] By formula: Calculate the abnormality coefficient YC, where b1 and b2 are preset proportion parameters and are both greater than 0, CD is the abnormality degree coefficient, and SC is the abnormality duration coefficient.

[0033] As a further solution of the present invention: the process of generating the evaluation signal is:

[0034] Preset a first threshold value of an abnormal coefficient and a second threshold value of an abnormal coefficient, and compare and analyze the abnormal coefficient with the first threshold value of the abnormal coefficient and the second threshold value of the abnormal coefficient respectively;

[0035] If the abnormal coefficient is ≤ the first abnormal coefficient threshold, a non-interference signal is generated;

[0036] If the first threshold value of the abnormal coefficient is less than the abnormal coefficient and less than the second threshold value of the abnormal coefficient, an interference warning signal is generated;

[0037] If the abnormal coefficient second threshold value is less than the abnormal coefficient, an interference signal is generated.

[0038] As a further solution of the present invention: the process of regulating the duration of the monitoring cycle is:

[0039] Based on the interference warning signal, the abnormal coefficient of the relay protection device within the monitoring period is extracted and marked as the current abnormal coefficient;

[0040] At the same time, the monitoring cycle duration of the monitoring cycle is extracted and marked as the current cycle duration;

[0041] Calculate the control cycle duration based on the current abnormal coefficient, the current cycle duration, the first threshold of the abnormal coefficient, and the second threshold of the abnormal coefficient;

[0042] Based on the length of the regulation cycle, the length of the next monitoring cycle is regulated.

[0043] As a further solution of the present invention: the process of obtaining the duration of the control cycle is:

[0044] By formula: Calculate the control cycle length KT, where DYC is the current abnormality coefficient, DT is the current cycle length, YCY is the first threshold of the abnormality coefficient, and YCR is the second threshold of the abnormality coefficient.

[0045] In a second aspect, the present invention provides an anti-interference relay protection device, comprising:

[0046] Data acquisition module: monitors the current of the relay protection device and obtains abnormal data within the monitoring period;

[0047] Among them, the abnormal data include: abnormal degree coefficient and abnormal duration coefficient;

[0048] Data processing module: calculate the abnormal coefficient based on abnormal data;

[0049] Interference assessment module: Based on the abnormal coefficient, it assesses whether the relay protection device is interfered with and generates an assessment signal;

[0050] Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal;

[0051] Control module: Based on the interference warning signal, the duration of the monitoring cycle is controlled.

[0052] Beneficial effects of the present invention:

[0053] (1) The present invention first sets a monitoring cycle, collects the current of the relay protection device in real time, and draws a current change curve and a preset current curve in a two-dimensional coordinate system. By comparing and analyzing the two curves, abnormal data are extracted from multiple dimensions: one is the degree of abnormality, including the difference in current shape and amplitude (abnormal characterization ratio), the quantification of current fluctuation (abnormal floating ratio) and the frequency of abnormal time periods (abnormal time period number ratio), and the abnormal degree coefficient is calculated by combining these proportional values; the second is the abnormal duration, that is, the proportion of the total duration of all abnormal time periods in the monitoring cycle, and the abnormal duration coefficient is obtained; then, the abnormal degree coefficient is combined with the abnormal duration coefficient to calculate the abnormal coefficient, which comprehensively reflects the difference between the current state and the preset state, including the degree of difference, fluctuation, frequency of occurrence and duration; finally, according to the comparison result of the abnormal coefficient and the preset threshold, a corresponding evaluation signal is generated: no interference signal indicates that the current state is close to the preset, the interference warning signal indicates that there is a certain degree of deviation and needs to be vigilant, and the interference signal warns that the current state is seriously deviated and there may be a major fault risk; the present invention effectively improves the accuracy and timeliness of fault detection of relay protection devices through multi-dimensional monitoring and analysis;

[0054] (2) When the present invention detects that the current state has a moderate deviation from the preset standard, it generates an interference warning signal, indicating that there may be a potential risk; at this time, the abnormal coefficient and cycle duration of the current monitoring cycle are extracted as the basis for adjustment; the adjustment strategy is based on the comparison of the current abnormal coefficient with the preset threshold, and the new monitoring cycle duration is determined by calculation; this adjustment aims to improve the real-time and accuracy of monitoring by shortening the cycle and capturing current data more frequently, so as to detect potential problems earlier; when implemented, the present invention will continue to apply new monitoring cycles and repeat the above process to form a dynamic cyclic monitoring mechanism. In this process, the strategy is continuously optimized and adjusted to adapt to changes in actual operating conditions and improve the overall efficiency of the monitoring system; the present invention realizes accurate and efficient monitoring of the current state of the relay protection device by intelligently adjusting the duration of the monitoring cycle, effectively reducing the risk of potential interference or failure, and providing a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described below in conjunction with the accompanying drawings.

[0056] Figure 1 It is a flowchart of the present invention;

[0057] Figure 2 It is a system block diagram of the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0059] Embodiment 1:

[0060] See also Figure 1 As shown, an anti-interference relay protection method according to an embodiment of the present invention comprises the following steps:

[0061] Step 1: Monitor the current of the relay protection device and obtain abnormal data within the monitoring period;

[0062] Among them, the monitoring period includes but is not limited to: 1 second, 5 seconds, 10 seconds;

[0063] Abnormal data include: abnormal degree coefficient and abnormal duration coefficient;

[0064] In some implementation schemes, during the monitoring period, the current of the relay protection device is monitored in real time to obtain the real-time current;

[0065] Based on a two-dimensional coordinate system with time as the X-axis and real-time current as the Y-axis, a curve is drawn to obtain a current change curve; at the same time, the real-time preset current within the monitoring period is preset to obtain a preset current curve;

[0066] Analyze the current change curve and the preset current curve to obtain the abnormal degree coefficient and the abnormal duration coefficient respectively;

[0067] First, specifically, the process of obtaining the abnormality degree coefficient is:

[0068] Based on the current change curve and the preset current curve, extract the non-overlapping portion between the current change curve and the preset current curve, and mark the time period where the non-overlapping portion is located as an abnormal period;

[0069] Obtain the abnormal representation ratio and abnormal floating ratio of each abnormal period respectively;

[0070] At the same time, based on the number of abnormal time periods in the monitoring period, the ratio of the number of abnormal time periods is obtained;

[0071] By formula: Calculate the abnormal degree coefficient CD, where a1, a2, and a3 are preset proportional factors, and all are greater than 0, i represents the i-th abnormal period in the monitoring period, i takes values ​​of 1, 2, 3, ..., N, N is the total number of abnormal periods, NB is the ratio of the number of abnormal periods, BB is the abnormal characterization ratio, and FB is the abnormal floating ratio;

[0072] First, the process of obtaining the abnormal characterization ratio is as follows:

[0073] Based on any abnormal time period, respectively extract the length of the current change curve and the preset current curve in the abnormal time period to obtain the current change characterization value and the preset current characterization value;

[0074] Calculate the difference between the current change characterization value and the preset current characterization value to obtain an abnormal characterization value, and calculate the ratio between the abnormal characterization value and the preset current characterization value to obtain an abnormal characterization ratio;

[0075] It should be explained that the abnormal characterization ratio reflects the difference in shape and amplitude between the current change curve and the preset current curve during the abnormal period. If the current change is far away from the preset value, the abnormal characterization ratio will be higher, indicating that the current state deviates greatly from the expected value.

[0076] Secondly, the process of obtaining the abnormal floating ratio is as follows:

[0077] Based on any abnormal period, extract the area of ​​the region enclosed by the current change curve in the abnormal period and the preset current curve to obtain the abnormal floating value, calculate the ratio of the abnormal floating value to the abnormal floating threshold, and obtain the abnormal floating ratio;

[0078] It should be explained that the abnormal floating value is calculated by ratio with the abnormal floating threshold. The abnormal floating threshold here is to remove the dimension of the abnormal floating value, so as to obtain a dimensionless value, namely, the abnormal floating ratio.

[0079] It needs to be further explained that the abnormal floating ratio is calculated by calculating the area enclosed by the current change curve during the abnormal period and the preset current curve, thereby quantifying the difference. The abnormal floating ratio reflects the overall fluctuation of the current during the abnormal period. The larger the value of the abnormal floating ratio, the more severe the current fluctuation is and the greater the risk is.

[0080] Third, the process of obtaining the abnormal period quantity ratio is as follows:

[0081] Extract the number of abnormal time periods in the monitoring period to obtain the total number of abnormal time periods, calculate the ratio of the total number of abnormal time periods to the threshold value of the number of abnormal time periods, and obtain the ratio of the number of abnormal time periods;

[0082] It should be explained that the ratio of the total number of abnormal time periods to the threshold number of abnormal time periods is calculated. The threshold number of abnormal time periods here is to remove the dimension of the total number of abnormal time periods, thereby obtaining a dimensionless value, namely, the ratio of the number of abnormal time periods;

[0083] It needs to be further explained that the ratio of the number of abnormal time periods reflects the frequency of the unstable current state, that is, the number of abnormalities. The larger the value of the number of abnormal time periods, the more likely it is that the current state frequently deviates from the preset value, and the greater the probability of continuous interference or failure.

[0084] Second, specifically, the process of obtaining the abnormal duration coefficient is as follows:

[0085] Extract the total duration of all abnormal periods to obtain the total abnormal duration, calculate the ratio of the total abnormal duration to the monitoring period duration, and obtain the abnormal duration coefficient;

[0086] It should be explained that the abnormal duration coefficient reflects the total length of time that the current state deviates from the preset state during the monitoring period. If the value of the abnormal duration coefficient is high, it means that the current state deviates from the preset value for a long time, which has a great impact on the stable operation of the system.

[0087] Step 2: Calculate the abnormal coefficient based on the abnormal data;

[0088] In some embodiments, by the formula: Calculate the abnormality coefficient YC, where b1 and b2 are preset ratio parameters and are both greater than 0, CD is the abnormality degree coefficient, and SC is the abnormality duration coefficient;

[0089] It should be explained that the abnormality coefficient reflects the degree of difference between the current state of the relay protection device and the preset state during the monitoring period, including the severity of the difference, fluctuation, frequency of occurrence and duration. The higher the value of the abnormality coefficient, the greater the difference between the current state and the preset state, and the higher the possible risk.

[0090] Step 3: Based on the abnormal coefficient, evaluate whether the relay protection device is disturbed and generate an evaluation signal;

[0091] Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal;

[0092] In some implementation schemes, a first threshold value of an abnormal coefficient and a second threshold value of an abnormal coefficient are preset, and the abnormal coefficient is compared and analyzed with the first threshold value of an abnormal coefficient and the second threshold value of an abnormal coefficient respectively;

[0093] If the abnormal coefficient is less than or equal to the first threshold value of the abnormal coefficient, it means that the difference between the current of the relay protection device and the preset current during the monitoring period is small, and it is determined that the relay protection device is less disturbed during the monitoring period, that is, a non-interference signal is generated;

[0094] If the first threshold value of the abnormal coefficient is less than the abnormal coefficient and less than the second threshold value of the abnormal coefficient, it means that the difference between the current of the relay protection device and the preset current in the monitoring period is moderate, and it is determined that the relay protection device is moderately disturbed in the monitoring period, that is, an interference warning signal is generated;

[0095] If the second threshold value of the abnormal coefficient is less than the abnormal coefficient, it means that the current of the relay protection device in the monitoring period is significantly different from the preset current, and it is determined that the relay protection device is significantly disturbed in the monitoring period, that is, an interference signal is generated;

[0096] The technical solution of the embodiment of the present invention is mainly as follows: first, a monitoring cycle is set, the current of the relay protection device is collected in real time, and a current change curve and a preset current curve are drawn in a two-dimensional coordinate system. By comparing and analyzing the two curves, abnormal data are extracted from multiple dimensions: one is the degree of abnormality, including the difference in current shape and amplitude (abnormal characterization ratio), the quantification of current fluctuations (abnormal floating ratio) and the frequency of occurrence of abnormal time periods (abnormal time period number ratio), and the abnormal degree coefficient is calculated by combining these proportion values; the second is the abnormal duration, that is, the proportion of the total duration of all abnormal time periods in the monitoring cycle, and the abnormal duration coefficient is obtained; then, the abnormal degree coefficient is combined with the abnormal duration coefficient to calculate the abnormal coefficient, which comprehensively reflects the difference between the current state and the preset state, including the degree of difference, fluctuation, frequency of occurrence and duration; finally, according to the comparison result of the abnormal coefficient and the preset threshold, a corresponding evaluation signal is generated: no interference signal indicates that the current state is close to the preset, the interference warning signal indicates that there is a certain degree of deviation and needs to be vigilant, and the interference signal warns that the current state is seriously deviated, and there may be a major fault risk; the embodiment of the present invention effectively improves the accuracy and timeliness of fault detection of the relay protection device through multi-dimensional monitoring and analysis.

[0097] Embodiment 2:

[0098] Based on Example 1, please refer to Figure 1 As shown, an anti-interference relay protection method described in an embodiment of the present invention further includes the following steps:

[0099] Step 4: Based on the interference warning signal, the duration of the monitoring cycle is adjusted, so that the current state of the relay protection device can be more effectively monitored and evaluated, and potential interference or failure can be responded to in a timely manner;

[0100] It should be explained that when an interference warning signal is generated, it indicates that there is a moderate difference between the current state of the relay protection device and the preset state, which means that there is a potential interference or a risk of impending failure. In order to more accurately capture the change in the current state, it is necessary to shorten the current monitoring cycle, so as to obtain current data more frequently, improve the real-time and accuracy of monitoring, and help to detect abnormal changes in the current state earlier;

[0101] In some implementation schemes, based on the interference warning signal, an abnormal coefficient of the relay protection device within the monitoring period is extracted and marked as a current abnormal coefficient;

[0102] At the same time, the monitoring cycle duration of the monitoring cycle is extracted and marked as the current cycle duration;

[0103] Calculate the control cycle duration based on the current abnormal coefficient, the current cycle duration, the first threshold of the abnormal coefficient, and the second threshold of the abnormal coefficient;

[0104] Based on the length of the regulation cycle, the length of the next monitoring cycle is regulated;

[0105] Specifically, the process of obtaining the duration of the regulation cycle is as follows:

[0106] By formula: Calculate the control cycle duration KT, where DYC is the current abnormal coefficient, DT is the current cycle duration, YCY is the first threshold of the abnormal coefficient, and YCR is the second threshold of the abnormal coefficient;

[0107] The technical solution of the embodiment of the present invention is mainly as follows: when a moderate deviation between the monitored current state and the preset standard is present, an interference warning signal is generated, indicating that there may be a potential risk; at this time, the abnormal coefficient and cycle duration of the current monitoring cycle are extracted as a basis for adjustment; the adjustment strategy is based on the comparison of the current abnormal coefficient with the preset threshold, and the new monitoring cycle duration is determined by calculation; this adjustment aims to improve the real-time and accuracy of monitoring by shortening the cycle and capturing current data more frequently, so as to detect potential problems earlier; during implementation, the present invention will continue to apply new monitoring cycles and repeat the above process to form a dynamic cyclic monitoring mechanism, during which the strategy is continuously optimized and adjusted to adapt to changes in actual operating conditions and improve the overall efficiency of the monitoring system; the embodiment of the present invention achieves accurate and efficient monitoring of the current state of the relay protection device by intelligently adjusting the duration of the monitoring cycle, effectively reducing the risk of potential interference or failure, and providing a strong guarantee for the stable operation of the power system.

[0108] Embodiment 3:

[0109] Based on Example 1 and Example 2, please refer to Figure 2 As shown, an anti-interference relay protection device according to an embodiment of the present invention includes:

[0110] Data acquisition module: monitors the current of the relay protection device and obtains abnormal data within the monitoring period;

[0111] Among them, the abnormal data include: abnormal degree coefficient and abnormal duration coefficient;

[0112] Data processing module: calculate the abnormal coefficient based on abnormal data;

[0113] Interference assessment module: Based on the abnormal coefficient, it assesses whether the relay protection device is interfered with and generates an assessment signal;

[0114] Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal;

[0115] Control module: Based on the interference warning signal, the duration of the monitoring cycle is controlled.

[0116] The above thresholds are set for the convenience of comparison. The thresholds depend on the amount of sample data and the number of bases set by technicians in this field for each set of sample data.

[0117] The above formulas are obtained by collecting a large amount of data and performing software simulation to select a formula close to the actual value. The parameters in the formula are set by technicians in this field according to actual conditions; for example: Formula: A technician in this field collects multiple groups of abnormal data and sets a corresponding abnormal coefficient for each group of abnormal data; substitutes the set abnormal coefficient and the collected abnormal data into the formula, any two formulas constitute a binary linear equation system, and the calculated factors are screened and averaged to obtain the values ​​of b1 and b2, which are 2.47 and 1.23 respectively;

[0118] The size of the parameter is to quantify each parameter to obtain a specific value, which is convenient for subsequent comparison. The size of the parameter depends on the amount of abnormal data and the initial setting of the corresponding abnormal coefficient for each set of abnormal data by technical personnel in this field; as long as it does not affect the proportional relationship between the parameter and the quantized value, such as the abnormal coefficient is proportional to the value of the abnormal degree coefficient.

[0119] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An anti-interference relay protection method, characterized in that: The following steps are involved: Step 1: Monitor the current of the relay protection device and obtain abnormal data within the monitoring period; Among them, the abnormal data include: abnormal degree coefficient and abnormal duration coefficient; Step 2: Calculate the abnormal coefficient based on the abnormal data; Step 3: Based on the abnormal coefficient, evaluate whether the relay protection device is disturbed and generate an evaluation signal; Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal; Step 4: Based on the interference warning signal, adjust the duration of the monitoring period.

2. The anti-interference relay protection method according to claim 1, characterized in that: The process of obtaining abnormal data is as follows: During the monitoring period, the current of the relay protection device is monitored in real time to obtain the real-time current; Based on a two-dimensional coordinate system with time as the X-axis and real-time current as the Y-axis, a curve is drawn to obtain a current change curve; at the same time, the real-time preset current within the monitoring period is preset to obtain a preset current curve; The current change curve and the preset current curve are analyzed to obtain the abnormal degree coefficient and the abnormal duration coefficient respectively.

3. The anti-interference relay protection method according to claim 2, characterized in that: The process of obtaining the abnormality degree coefficient is as follows: Based on the current change curve and the preset current curve, extract the non-overlapping portion between the current change curve and the preset current curve, and mark the time period where the non-overlapping portion is located as an abnormal period; Obtain the abnormal representation ratio and abnormal floating ratio of each abnormal period respectively; At the same time, based on the number of abnormal time periods in the monitoring period, the ratio of the number of abnormal time periods is obtained; By formula: Calculate the abnormality degree coefficient CD, where a1, a2, and a3 are preset proportional factors, and all are greater than 0. i represents the i-th abnormal period in the monitoring period, and the value of i is 1, 2, 3, ..., N, where N is the total number of abnormal periods, NB is the ratio of the number of abnormal periods, BB is the abnormal characterization ratio, and FB is the abnormal floating ratio.

4. The anti-interference relay protection method according to claim 3, characterized in that: The process of obtaining the abnormal characterization ratio is as follows: Based on any abnormal time period, respectively extract the length of the current change curve and the preset current curve in the abnormal time period to obtain the current change characterization value and the preset current characterization value; Calculate the difference between the current change characterization value and the preset current characterization value to obtain an abnormal characterization value, and calculate the ratio between the abnormal characterization value and the preset current characterization value to obtain an abnormal characterization ratio; The process of obtaining the abnormal floating ratio is as follows: Based on any abnormal period, extract the area of ​​the region enclosed by the current change curve in the abnormal period and the preset current curve to obtain the abnormal floating value, calculate the ratio of the abnormal floating value to the abnormal floating threshold, and obtain the abnormal floating ratio; The process of obtaining the abnormal period quantity ratio is as follows: The number of abnormal time periods in the monitoring period is extracted to obtain the total number of abnormal time periods, and the total number of abnormal time periods is calculated to be proportional to the threshold value of the number of abnormal time periods to obtain the ratio of the number of abnormal time periods.

5. The anti-interference relay protection method according to claim 2, characterized in that: The process of obtaining the abnormal duration coefficient is as follows: The total duration of all abnormal periods is extracted to obtain the total abnormal duration, and the ratio of the total abnormal duration to the monitoring period duration is calculated to obtain the abnormal duration coefficient.

6. The anti-interference relay protection method according to claim 1, characterized in that: The process of obtaining the anomaly coefficient is: By formula: Calculate the abnormality coefficient YC, where b1 and b2 are preset proportion parameters and are both greater than 0, CD is the abnormality degree coefficient, and SC is the abnormality duration coefficient.

7. The anti-interference relay protection method according to claim 1, characterized in that: The process of generating the evaluation signal is: Preset a first threshold value of an abnormal coefficient and a second threshold value of an abnormal coefficient, and compare and analyze the abnormal coefficient with the first threshold value of the abnormal coefficient and the second threshold value of the abnormal coefficient respectively; If the abnormal coefficient is ≤ the first abnormal coefficient threshold, a non-interference signal is generated; If the first threshold value of the abnormal coefficient is less than the abnormal coefficient and less than the second threshold value of the abnormal coefficient, an interference warning signal is generated; If the abnormal coefficient second threshold value is less than the abnormal coefficient, an interference signal is generated.

8. The anti-interference relay protection method according to claim 1, characterized in that: The process of regulating the duration of the monitoring cycle is as follows: Based on the interference warning signal, the abnormal coefficient of the relay protection device within the monitoring period is extracted and marked as the current abnormal coefficient; At the same time, the monitoring cycle duration of the monitoring cycle is extracted and marked as the current cycle duration; Calculate the control cycle duration based on the current abnormal coefficient, the current cycle duration, the first threshold of the abnormal coefficient, and the second threshold of the abnormal coefficient; Based on the length of the regulation cycle, the length of the next monitoring cycle is regulated.

9. The anti-interference relay protection method according to claim 8, characterized in that: The process of obtaining the duration of the regulation cycle is as follows: By formula: Calculate the control cycle length KT, where DYC is the current abnormality coefficient, DT is the current cycle length, YCY is the first threshold of the abnormality coefficient, and YCR is the second threshold of the abnormality coefficient. 10.An anti-interference relay protection device, characterized in that: The system is used to execute the method according to any one of claims 1 to 9, including: Data acquisition module: monitors the current of the relay protection device and obtains abnormal data within the monitoring period; Among them, the abnormal data include: abnormal degree coefficient and abnormal duration coefficient; Data processing module: calculate the abnormal coefficient based on abnormal data; Interference assessment module: Based on the abnormal coefficient, it assesses whether the relay protection device is interfered with and generates an assessment signal; Among them, the evaluation signals include: no interference signal, interference warning signal, and interference signal; Control module: Based on the interference warning signal, the duration of the monitoring cycle is controlled.

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