A method for controlling optical fiber path switching for AC differential protection

Abstract

The present invention provides a method for switching control of optical fiber paths for AC differential protection, which belongs to the technical field of line protection, and specifically comprises: determining the abnormal operation values ​​and abnormal operation load current intervals of an AC differential protection device in different load current intervals based on delayed processing data and historical operation data, obtaining weather data of the current date, and using the weather data to determine the predicted operation probability of the transmission line in different abnormal operation load current intervals, and determining whether the AC differential protection device needs to perform switching control of the optical fiber path according to the predicted operation probability and abnormal operation value in different abnormal operation load current intervals, thereby ensuring the working reliability of the AC differential protection.

Description

Technical Field

[0001] The invention belongs to the technical field of line protection, and in particular relates to an optical fiber path switching control method for AC differential protection. Background Art

[0002] AC differential protection uses the current vector difference between the two ends of the input CT (current transformer) to start the action element when the set action value is reached. The protection range is between the two ends of the input CT. Generally, in long-distance transmission lines, the signal transmission on both sides of the protection line is often achieved through optical fiber or wireless network. Therefore, how to achieve the switching control of the optical fiber channel and ensure the real-time and reliability of signal transmission has become a technical problem that needs to be solved urgently.

[0003] In order to solve the above technical problems, the existing technical solutions often control the switching of the optical fiber channel by analyzing the transmission data of the optical fiber channel and the delay analysis results, so as to ensure the working stability of the AC differential protection. However, the existing technical solutions have the following technical problems:

[0004] Since the optical fiber channel transmits the line current at both ends of the line, the difference in operating load may cause the difference in the amplitude of the line current at both ends of the line. This may result in a large differential current and false operation due to the delay of the optical fiber path when the amplitude is large. Therefore, if the switching control of the optical fiber path cannot be carried out in time considering the operating load of the transmission line, the working reliability of the AC differential protection device cannot be guaranteed.

[0005] In view of the above technical problems, the present invention provides a fiber optic path switching control method for AC differential protection. Summary of the invention

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] In order to solve the above technical problems, the present invention provides a method for controlling optical fiber path switching for AC differential protection, which specifically includes:

[0008] S1 determines the differential current history data of the AC differential protection device in different amplitude intervals, and uses the differential current history data in different amplitude intervals and the operating load current of the transmission circuit corresponding to the differential current history data to determine that there is a suspected abnormality in the optical fiber path of the AC differential protection device, and then proceeds to the next step;

[0009] S2 determines the delayed processing data of the optical fiber channel of the AC differential protection device in different delayed processing intervals through the differential current historical data and the operating load current of the transmission line corresponding to the differential current historical data, and determines the abnormal operation value of the AC differential protection device in different load current intervals and the abnormal operation load current interval based on the delayed processing data and the historical operation data;

[0010] S3: obtaining weather data of the current date, and using the weather data to determine the predicted operation probability of the transmission line in different operation abnormal load current intervals;

[0011] S4 determines whether the AC differential protection device needs to perform switching control of the optical fiber path according to the predicted operation probability and the operation abnormality value in different operation abnormal load current intervals.

[0012] The beneficial effects of the present invention are:

[0013] 1. In the present invention, the differential current historical data in different amplitude ranges and the operating load current of the transmission circuit corresponding to the differential current historical data are used to determine whether there is a suspected abnormality in the optical fiber path of the AC differential protection device. Not only the abnormality degree of the delay of the optical fiber path is considered from the distribution of the amplitude range of the differential current historical data of the AC differential protection device, but also the difference in the abnormality degree of different differential current amplitudes caused by the operating load current of the transmission circuit corresponding to the AC differential protection device is considered, thereby achieving accurate screening of optical fiber paths with suspected abnormalities.

[0014] 2. In the present invention, whether the AC differential protection device needs to perform switching control of the optical fiber path is determined based on the predicted operation probability in different operation abnormal load current intervals and the operation abnormality value. This not only takes into account the operation possibility in different operation abnormal load current intervals, but also further combines the operation abnormality value to realize the consideration of the operation data of the corresponding transmission circuit of the optical path, thereby ensuring the operation reliability of the AC differential protection device from the perspective of load current.

[0015] A further technical solution is that the differential current historical data is determined based on the analysis result of the stored data of the differential current of the AC differential protection device.

[0016] A further technical solution is that, when there is no suspected abnormality in the optical fiber path of the AC differential protection device, it is determined that the AC differential protection device does not need to perform switching control of the optical fiber path temporarily.

[0017] A further technical solution is that the delayed processing data includes the delayed processing duration and the number of occurrences of different delayed processing durations.

[0018] A further technical solution is that the method for determining the predicted operation probability is:

[0019] Determine weather data of different dimensions using the weather data, and determine similar dates to the current date using the weather data of different dimensions;

[0020] Determine the operation duration in the abnormal operation load current interval on the similar date according to the operation data in the abnormal operation load current interval on the similar date, and determine the screened similar date in the similar date by using the operation duration;

[0021] The predicted operation probability of the transmission line in different operation abnormal load current intervals is determined based on the proportion of the screened similar dates in the similar dates.

[0022] A further technical solution is to determine whether the AC differential protection device needs to perform switching control of the optical fiber path, specifically including:

[0023] Dividing the abnormal operation load current interval into different predicted operation probability intervals by predicting the operation probabilities in different abnormal operation load current intervals;

[0024] Obtaining operation abnormality values ​​of different operation abnormality load current intervals in different predicted operation probability intervals, and determining comprehensive abnormality values ​​of different predicted operation probability intervals in combination with the predicted operation probabilities of different operation abnormality load current intervals;

[0025] Determine the weight values ​​of different predicted operation probability intervals by using the predicted operation probability ranges of different predicted operation probability intervals, and determine the device abnormality value of the AC differential protection device in combination with the comprehensive abnormality values ​​of the different predicted operation probability intervals;

[0026] The device abnormal value is used to determine whether the AC differential protection device needs to perform switching control of the optical fiber path.

[0027] A further technical solution is to use the abnormal value of the device to determine whether the AC differential protection device needs to perform switching control of the optical fiber path, specifically including:

[0028] When the device abnormal value of the AC differential protection device does not meet the requirement, it is determined that the AC differential protection device needs to perform switching control of the optical fiber path.

[0029] Other features and advantages will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0032] Figure 1 It is a flow chart of a method for controlling switching of optical fiber paths for AC differential protection;

[0033] Figure 2 is a flow chart of a method for determining an abnormal load current interval;

[0034] Figure 3 is a flow chart of a method for determining a predicted operating probability. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0036] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0037] To solve the above problems, according to one aspect of the present invention, Figure 1 As shown, according to one aspect of the present invention, a method for controlling optical fiber path switching for AC differential protection is provided, which specifically includes:

[0038] S1 determines the differential current history data of the AC differential protection device in different amplitude intervals, and uses the differential current history data in different amplitude intervals and the operating load current of the transmission circuit corresponding to the differential current history data to determine that there is a suspected abnormality in the optical fiber path of the AC differential protection device, and then proceeds to the next step;

[0039] Furthermore, the differential current historical data is determined based on an analysis result of stored data of the differential current of the AC differential protection device.

[0040] It should be noted that the determination of suspected abnormality in the optical fiber path of the AC differential protection device specifically includes:

[0041] Determine the number of occurrences of a differential current amplitude greater than a preset amplitude through differential current historical data in different amplitude intervals, and use it as the number of differential current abnormalities, and determine the current amplitude abnormality value of the AC differential protection device through the differential current amplitudes of different differential current abnormalities;

[0042] Determine the current ratio of the differential current amplitude to the operating load current based on the operating load current of the transmission line corresponding to the differential current historical data, and determine the number of differential current ratio abnormalities using the current ratio, and determine the current ratio abnormality value of the AC differential protection device by using the current ratios of different differential current ratio abnormalities;

[0043] The abnormal value of differential current of the AC differential protection device is determined according to the abnormal value of current proportion and the abnormal value of current amplitude of the AC differential protection device, and the abnormal value of differential current is used to determine whether there is a suspected abnormality in the optical fiber path of the AC differential protection device.

[0044] Further, using the abnormal value of the differential current to determine whether there is a suspected abnormality in the optical fiber path of the AC differential protection device specifically includes:

[0045] When the abnormal value of the differential current is less than a preset abnormal threshold, it is determined that there is no suspected abnormality in the optical fiber path of the AC differential protection device.

[0046] It can be understood that when there is no suspected abnormality in the optical fiber path of the AC differential protection device, it is determined that the AC differential protection device does not need to perform switching control of the optical fiber path temporarily.

[0047] In another embodiment, determining that there is a suspected abnormality in the optical fiber path of the AC differential protection device specifically includes:

[0048] Determine whether the AC differential protection device has a differential current amplitude greater than a preset amplitude through differential current history data in different amplitude intervals, if so, proceed to step 1, if not, proceed to the next step;

[0049] Determine the ratio of the differential current amplitude to the current of the operating load current based on the operating load current of the transmission line corresponding to the differential current historical data, and judge whether there is an abnormal situation in the AC differential protection device that the current ratio is greater than a preset ratio, if yes, proceed to the next step, if no, determine that there is no suspected abnormality in the optical fiber path of the AC differential protection device;

[0050] Determine the number of occurrences of the differential current amplitude being greater than the preset amplitude through the differential current historical data of different amplitude intervals, and use it as the number of differential current abnormalities, and judge whether the number of differential current abnormalities meets the requirements. If so, proceed to the next step; if not, determine that there is a suspected abnormality in the optical fiber path of the AC differential protection device;

[0051] Determine the current ratio of the differential current amplitude to the operating load current of the transmission line corresponding to the differential current historical data, and determine the number of abnormal differential current ratios using the current ratio, and judge whether the number of abnormal differential current ratios meets the requirements. If so, proceed to the next step; if not, determine that there is a suspected abnormality in the optical fiber path of the AC differential protection device;

[0052] Determine the current amplitude abnormal value of the AC differential protection device by the differential current amplitudes of different differential current abnormal times, and determine the current ratio abnormal value of the AC differential protection device by the current ratios of different differential current ratio abnormal times;

[0053] The abnormal value of differential current of the AC differential protection device is determined according to the abnormal value of current proportion and the abnormal value of current amplitude of the AC differential protection device, and the abnormal value of differential current is used to determine whether there is a suspected abnormality in the optical fiber path of the AC differential protection device.

[0054] S2 determines the delayed processing data of the optical fiber channel of the AC differential protection device in different delayed processing intervals through the differential current historical data and the operating load current of the transmission line corresponding to the differential current historical data, and determines the abnormal operation value of the AC differential protection device in different load current intervals and the abnormal operation load current interval based on the delayed processing data and the historical operation data;

[0055] Furthermore, the delayed processing data includes the delayed processing duration and the number of occurrences of different delayed processing durations.

[0056] Specifically, Figure 2 As shown, the method for determining the abnormal load current interval is:

[0057] Determine the historical operation times of the AC differential protection device in different load current intervals through the historical operation data, determine the operation frequency of different load current intervals in combination with the operation duration of different historical operation times, and determine the commonly used current interval in the load current interval based on the operation frequency;

[0058] Determine the delay processing duration based on the delay processing data, and screen the delay processing duration according to the number of occurrences of different delay processing durations;

[0059] Determine the current abnormality value of the common current interval under different screening delay processing time lengths by using the amplitude range of the differential current corresponding to the common current interval under different screening delay processing time lengths, and determine the current abnormality evaluation amount of the common current interval in combination with the number of occurrences of different screening delay processing time lengths;

[0060] The operation abnormality value of the common current interval is determined according to the current abnormality evaluation amount and the operation frequency of the common current interval, and the operation abnormality value is used to determine whether the common current interval is an operation abnormal load current interval.

[0061] Further, the determination of the delay processing duration is performed based on the number of occurrences of different delay processing durations, specifically including:

[0062] When the number of occurrences is greater than the preset number, the delay processing time is used as the screening delay processing time.

[0063] In another embodiment, the method for determining the abnormal load current interval is:

[0064] Determine the accumulated operation time of the AC differential protection device in different load current intervals through the historical operation data, judge whether the accumulated operation time of the AC differential protection device in different load current intervals is less than the preset time, if so, determine that the load current interval does not belong to the abnormal operation load current interval, if not, proceed to the next step;

[0065] Determine the delay processing time length based on the delay processing data, and screen the delay processing time length according to the number of occurrences of different delay processing time lengths, and determine whether the differential current of the load current interval is abnormal through the amplitude range of the differential current corresponding to the load current interval under different screening delay processing time lengths. If not, determine that the load current interval does not belong to the abnormal operation load current interval. If so, proceed to the next step;

[0066] Determine the historical operation times of the AC differential protection device in different load current intervals through the historical operation data, and determine the operation frequency of different load current intervals in combination with the operation duration of different historical operation times, and determine whether the load current interval is a common current interval based on the operation frequency, if so, proceed to the next step, if not, determine that the load current interval does not belong to an abnormal operation load current interval;

[0067] Determine the current abnormal value of the common current interval under different screening delay processing time lengths through the amplitude range of the differential current corresponding to the common current interval under different screening delay processing time lengths, and use the screening delay processing time length when the current abnormal value does not meet the requirements as the abnormal delay processing time length, and judge whether the number of occurrences of the abnormal delay processing time length is less than the preset number of occurrences. If so, determine that the load current interval does not belong to the operation abnormal load current interval, if not, proceed to the next step;

[0068] The current anomaly evaluation amount of the commonly used current interval is determined by using the current anomaly values ​​of the commonly used current interval under different screening delay processing time lengths and the number of occurrences of different screening delay processing time lengths. The operation anomaly value of the commonly used current interval is determined according to the current anomaly evaluation amount of the commonly used current interval and the operation frequency. The operation anomaly value is used to determine whether the commonly used current interval is an operation abnormal load current interval.

[0069] S3: obtaining weather data of the current date, and using the weather data to determine the predicted operation probability of the transmission line in different operation abnormal load current intervals;

[0070] Specifically, Figure 3 As shown, the method for determining the predicted running probability is:

[0071] Determine weather data of different dimensions using the weather data, and determine similar dates to the current date using the weather data of different dimensions;

[0072] Determine the operation duration in the abnormal operation load current interval on the similar date according to the operation data in the abnormal operation load current interval on the similar date, and determine the screened similar date in the similar date by using the operation duration;

[0073] The predicted operation probability of the transmission line in different operation abnormal load current intervals is determined based on the proportion of the screened similar dates in the similar dates.

[0074] S4 determines whether the AC differential protection device needs to perform switching control of the optical fiber path according to the predicted operation probability and the operation abnormality value in different operation abnormal load current intervals.

[0075] Further, determining whether the AC differential protection device needs to perform switching control of the optical fiber path specifically includes:

[0076] Dividing the abnormal operation load current interval into different predicted operation probability intervals by predicting the operation probabilities in different abnormal operation load current intervals;

[0077] Obtaining operation abnormality values ​​of different operation abnormality load current intervals in different predicted operation probability intervals, and determining comprehensive abnormality values ​​of different predicted operation probability intervals in combination with the predicted operation probabilities of different operation abnormality load current intervals;

[0078] Determine the weight values ​​of different predicted operation probability intervals by using the predicted operation probability ranges of different predicted operation probability intervals, and determine the device abnormality value of the AC differential protection device in combination with the comprehensive abnormality values ​​of the different predicted operation probability intervals;

[0079] The device abnormal value is used to determine whether the AC differential protection device needs to perform switching control of the optical fiber path.

[0080] It should be noted that the use of the abnormal value of the device to determine whether the AC differential protection device needs to perform switching control of the optical fiber path specifically includes:

[0081] When the device abnormal value of the AC differential protection device does not meet the requirement, it is determined that the AC differential protection device needs to perform switching control of the optical fiber path.

[0082] In another embodiment, determining whether the AC differential protection device needs to perform switching control of the optical fiber path specifically includes:

[0083] Determine the abnormal operation load current interval whose predicted operation probability is greater than the preset probability by using the predicted operation probability in different abnormal operation load current intervals, and use it as the determination of the high probability load current interval, and judge whether the number of the high probability load current intervals is greater than the preset number of intervals, if so, determine that the AC differential protection device needs to perform switching control of the optical fiber path, if not, proceed to the next step;

[0084] Determine the abnormal value of the high probability interval according to the predicted operation probability of the high probability load current interval and the operation abnormal value, and judge whether the abnormal value of the high probability interval meets the requirements, if so, proceed to the next step, if not, determine that the AC differential protection device needs to perform switching control of the optical fiber path;

[0085] By dividing the operation abnormal load current interval into different predicted operation probability intervals according to the predicted operation probabilities in different operation abnormal load current intervals, obtaining operation abnormality values ​​of different operation abnormal load current intervals in different predicted operation probability intervals, and determining the comprehensive abnormality values ​​of different predicted operation probability intervals in combination with the predicted operation probabilities of different operation abnormal load current intervals, judging whether there is a predicted operation probability interval whose comprehensive abnormality value does not meet the requirements, if so, proceeding to the next step, if not, determining that the AC differential protection device does not need to perform switching control of the optical fiber path;

[0086] The weight values ​​of different predicted operation probability intervals are determined based on the predicted operation probability ranges of different predicted operation probability intervals, and the device abnormality value of the AC differential protection device is determined in combination with the comprehensive abnormality values ​​of the different predicted operation probability intervals. The device abnormality value is used to determine whether the AC differential protection device needs to perform switching control of the optical fiber path.

[0087] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0088] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the 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.

[0089] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims

1. A method for controlling optical fiber path switching for AC differential protection, comprising: Determine the differential current history data of the AC differential protection device in different amplitude intervals, and when it is determined that there is a suspected abnormality in the optical fiber path of the AC differential protection device by using the differential current history data in different amplitude intervals and the operating load current of the transmission circuit corresponding to the differential current history data, proceed to the next step; Determine the delayed processing data of the optical fiber channel of the AC differential protection device in different delayed processing intervals through the differential current historical data and the operating load current of the transmission line corresponding to the differential current historical data, and determine the operating abnormality values ​​and operating abnormal load current intervals of the AC differential protection device in different load current intervals based on the delayed processing data and the historical operating data; Acquiring weather data of the current date, and using the weather data to determine the predicted operation probability of the transmission line in different operation abnormal load current intervals; Whether the AC differential protection device needs to perform switching control of the optical fiber path is determined according to the predicted operation probability and the operation abnormality value in different operation abnormal load current intervals.

2. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: The differential current historical data is determined according to the analysis result of the stored data of the differential current of the AC differential protection device.

3. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: It is determined that there are suspected abnormalities in the optical fiber path of the AC differential protection device, including: Determine the number of occurrences of a differential current amplitude greater than a preset amplitude through differential current historical data in different amplitude intervals, and use it as the number of differential current abnormalities, and determine the current amplitude abnormality value of the AC differential protection device through the differential current amplitudes of different differential current abnormalities; Determine the current ratio of the differential current amplitude to the operating load current based on the operating load current of the transmission line corresponding to the differential current historical data, and determine the number of differential current ratio abnormalities using the current ratio, and determine the current ratio abnormality value of the AC differential protection device by using the current ratios of different differential current ratio abnormalities; The abnormal value of differential current of the AC differential protection device is determined according to the abnormal value of current proportion and the abnormal value of current amplitude of the AC differential protection device, and the abnormal value of differential current is used to determine whether there is a suspected abnormality in the optical fiber path of the AC differential protection device.

4. The optical fiber path switching control method for AC differential protection according to claim 3, characterized in that: Determining whether there is a suspected abnormality in the optical fiber path of the AC differential protection device by using the abnormal value of the differential current specifically includes: When the abnormal value of the differential current is less than a preset abnormal threshold, it is determined that there is no suspected abnormality in the optical fiber path of the AC differential protection device.

5. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: The delayed processing data includes the delayed processing duration and the number of occurrences of different delayed processing durations.

6. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: The method for determining the abnormal operation load current interval is: Determine the historical operation times of the AC differential protection device in different load current intervals through the historical operation data, determine the operation frequency of different load current intervals in combination with the operation duration of different historical operation times, and determine the commonly used current interval in the load current interval based on the operation frequency; Determine the delay processing duration based on the delay processing data, and screen the delay processing duration according to the number of occurrences of different delay processing durations; Determine the current abnormality value of the common current interval under different screening delay processing time lengths by using the amplitude range of the differential current corresponding to the common current interval under different screening delay processing time lengths, and determine the current abnormality evaluation amount of the common current interval in combination with the number of occurrences of different screening delay processing time lengths; The operation abnormality value of the common current interval is determined according to the current abnormality evaluation amount and the operation frequency of the common current interval, and the operation abnormality value is used to determine whether the common current interval is an operation abnormal load current interval.

7. The optical fiber path switching control method for AC differential protection according to claim 6, characterized in that: The delay processing time is determined based on the number of occurrences of different delay processing time lengths, including: When the number of occurrences is greater than the preset number, the delay processing time is used as the screening delay processing time.

8. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: The method for determining the predicted operation probability is: Determine weather data of different dimensions using the weather data, and determine similar dates to the current date using the weather data of different dimensions; Determine the operation duration in the abnormal operation load current interval on the similar date according to the operation data in the abnormal operation load current interval on the similar date, and determine the screened similar date in the similar date by using the operation duration; The predicted operation probability of the transmission line in different operation abnormal load current intervals is determined based on the proportion of the screened similar dates in the similar dates.

9. The optical fiber path switching control method for AC differential protection according to claim 1, characterized in that: Determining whether the AC differential protection device needs to perform switching control of the optical fiber path specifically includes: Dividing the abnormal operation load current interval into different predicted operation probability intervals by predicting the operation probabilities in different abnormal operation load current intervals; Obtaining operation abnormality values ​​of different operation abnormality load current intervals in different predicted operation probability intervals, and determining comprehensive abnormality values ​​of different predicted operation probability intervals in combination with the predicted operation probabilities of different operation abnormality load current intervals; Determine the weight values ​​of different predicted operation probability intervals by using the predicted operation probability ranges of different predicted operation probability intervals, and determine the device abnormality value of the AC differential protection device in combination with the comprehensive abnormality values ​​of the different predicted operation probability intervals; The device abnormal value is used to determine whether the AC differential protection device needs to perform switching control of the optical fiber path.

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