Abnormal monitoring and evaluation method and system for optical CT analog quantity of converter station

Abstract

The invention discloses a converter station optical CT analog quantity abnormity monitoring evaluation method and system, and the method comprises the steps: reading a fault recording file of each DC control protection host built in a converter station, and obtaining optical CT analog quantity data collected by each DC control protection host; an optical CT analog quantity effective value, an optical CT analog quantity maximum value and an optical CT analog quantity minimum value corresponding to each optical CT in each piece of optical CT analog quantity data are calculated, and the optical CT analog quantity effective value is obtained based on operation processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range; and identifying abnormal data in the optical CT analog quantity data collected by each direct current control protection host based on a preset abnormal data detection rule. According to the invention, the optical CT analog quantity data of each DC control protection host can be automatically collected; abnormal data can be automatically identified, and the accuracy of the optical CT analog quantity is effectively evaluated.

Description

Technical Field

[0001] The present invention relates to the field of smart grid technology, and in particular to a method and system for monitoring and evaluating abnormality of optical CT analog quantities in a converter station. Background Art

[0002] The converter station is a key facility for realizing the mutual conversion between AC and DC power in the power system. The DC field and AC filter area configured inside it play a vital role in ensuring the efficient and stable transmission of electric energy. In these key areas, the application of fiber optic current transformers (abbreviated as optical CT) is becoming more and more extensive. With the advantages of high precision, high stability and strong anti-electromagnetic interference ability, they have become important measurement components in modern power systems.

[0003] The optical CT analog quantity needs to go through a series of transmission links before it can reach the control and protection host. These links include the optical CT body, electronic unit, merging unit and the final control and protection host. The entire transmission process uses optical signals, which effectively avoids the influence of electromagnetic interference on the measurement accuracy. However, this also puts extremely high demands on the measurement accuracy of the optical CT analog quantity, because any slight measurement deviation may directly affect the normal functioning of the DC control and protection function, which may lead to deviations in power transmission and malfunctions of the protection system, posing a threat to the safe and stable operation of the power system.

[0004] At present, the accuracy assessment of optical CT simulation mainly relies on manual transcription and manual comparison. This method is not only labor-intensive and inefficient, but also easily affected by human factors, making it difficult to ensure the accuracy of the analysis results. Especially in large-scale and complex power systems, the manual monitoring and evaluation of optical CT simulation methods can no longer meet actual needs.

[0005] Therefore, it is necessary to propose a more effective method to monitor and evaluate the accuracy of optical CT simulation. Summary of the invention

[0006] In order to solve the technical problem that it is difficult to effectively evaluate the accuracy of optical CT analog quantities in the prior art, the present invention provides an abnormal monitoring and evaluation method and system for optical CT analog quantities of a converter station.

[0007] In a first aspect, an embodiment of the present invention provides a method for monitoring and evaluating abnormality of optical CT analog quantities in a converter station, comprising: Read the fault recording file of each DC control and protection host built in the converter station to obtain the optical CT analog data collected by each DC control and protection host, wherein the optical CT analog data includes the optical CT analog data collected by each optical CT in the DC field area of ​​the converter station at different sampling times; Calculating an effective value of an optical CT analog quantity, a maximum value of an optical CT analog quantity, and a minimum value of an optical CT analog quantity corresponding to each optical CT in each of the optical CT analog quantity data, wherein the effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range; Identify abnormal data in the optical CT analog data collected by each of the DC control protection hosts based on a preset abnormal data detection rule; Among them, the preset abnormal data detection rules include identifying abnormal light CT analog quantity effective values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data, identifying abnormal light CT analog quantity maximum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the maximum value of the light CT analog quantity, identifying abnormal light CT analog quantity minimum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the minimum value of the light CT analog quantity, and identifying abnormal light CT analog quantity based on comparison of the light CT analog quantity collected by each of the light CT in each of the light CT analog quantity data at different sampling times with a first preset threshold value.

[0008] Preferably, the preset abnormal data detection rule further includes identifying abnormal differential current based on comparison between each differential current in the DC field area within the converter station and a second preset threshold.

[0009] Preferably, the preset abnormal data detection rule further includes identifying an abnormal zero drift value based on a comparison between the zero drift value of each optical CT analog quantity in each optical CT analog quantity data and a third preset threshold.

[0010] Preferably, after identifying abnormal data in the optical CT analog data collected by each DC control protection host based on a preset abnormal data detection rule, the method further includes: The optical CT analog data collected by each DC control protection host is visualized, and the identified abnormal data is highlighted.

[0011] Preferably, the effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the optical CT within a preset time range, including: Calculate the root mean square value of a plurality of optical CT analog quantities collected by the optical CT within a preset time range, and characterize the root mean square value as the effective value of the optical CT analog quantity corresponding to the optical CT, wherein the preset time range starts from the second power frequency cycle and ends at the Nth power frequency cycle, and N is an integer greater than 2.

[0012] Preferably, the comparing and identifying the abnormal light CT analog quantity effective value based on the light CT analog quantity effective value corresponding to the same light CT in each light CT analog quantity data comprises: Arrange the effective value of the optical CT analog quantity corresponding to the same optical CT in each of the optical CT analog quantity data according to the arrangement order of the DC control and protection host in the converter station, and characterize the effective value of the optical CT analog quantity in the middle position as a reference value; Based on the comparison between the effective value of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data and the reference value, when the comparison result is that the difference between the effective value of the light CT analog quantity and the reference value is not within a first preset range, the effective value of the light CT analog quantity is an abnormal light CT analog quantity effective value.

[0013] Preferably, the step of identifying the abnormal maximum value of the optical CT analog quantity based on the comparison between the effective value of the optical CT analog quantity corresponding to each optical CT in each optical CT analog quantity data and the maximum value of the optical CT analog quantity comprises: When the comparison result is that the difference between the maximum light CT simulation value corresponding to each light CT in each light CT simulation value data and the effective value of the light CT simulation value is not within the second preset range, the maximum light CT simulation value is the abnormal maximum light CT simulation value.

[0014] Preferably, the step of identifying the abnormal minimum value of the light CT analog quantity based on the comparison between the effective value of the light CT analog quantity corresponding to each light CT in each light CT analog quantity data and the minimum value of the light CT analog quantity comprises: When the comparison result is that the difference between the effective value of the light CT simulation quantity corresponding to each light CT in each of the light CT simulation quantity data and the minimum value of the light CT simulation quantity is not within the third preset range, the minimum value of the light CT simulation quantity is an abnormal minimum value of the light CT simulation quantity.

[0015] In a second aspect, an embodiment of the present invention provides an abnormal monitoring and evaluation system for analog quantities of optical CTs in converter stations, including: A data acquisition module is used to read the fault recording file of each DC control and protection host built in the converter station, and obtain the optical CT analog data collected by each DC control and protection host, wherein the optical CT analog data includes the optical CT analog data collected by each optical CT in the DC field area of ​​the converter station at different sampling times; a data calculation module, used to calculate an effective value of an optical CT analog quantity, a maximum value of an optical CT analog quantity, and a minimum value of an optical CT analog quantity corresponding to each optical CT in each of the optical CT analog quantity data, wherein the effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range; An abnormality detection module, used for identifying abnormal data in the optical CT analog data collected by each of the DC control protection hosts based on preset abnormal data detection rules; Among them, the preset abnormal data detection rules include identifying abnormal light CT analog quantity effective values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data, identifying abnormal light CT analog quantity maximum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the maximum value of the light CT analog quantity, identifying abnormal light CT analog quantity minimum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the minimum value of the light CT analog quantity, and identifying abnormal light CT analog quantity based on comparison of the light CT analog quantity collected by each of the light CT in each of the light CT analog quantity data at different sampling times with a first preset threshold value.

[0016] Preferably, it also includes: The data display module is used to visualize the optical CT analog data collected by each DC control protection host and highlight the identified abnormal data.

[0017] Compared with the prior art, the abnormal monitoring and evaluation method and system for the optical CT analog quantity of a converter station in the embodiment of the present invention has the following beneficial effects: based on the fault recording file built into the DC control and protection host, the optical CT analog quantity data of each DC control and protection host can be automatically collected; based on the preset abnormal data detection rules, automatic analysis such as horizontal comparison of the effective values ​​of the optical CT analog quantity corresponding to the same optical CT between the DC control and protection hosts and vertical comparison of the optical CT analog quantities collected by the same optical CT at different times can be realized, abnormal data can be automatically identified, and the accuracy of the optical CT analog quantity can be effectively evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of an abnormal monitoring and evaluation method of an optical CT analog quantity of a converter station according to an embodiment of the present invention; Figure 2 Schematic diagram of the data format of each sampling point in the wave recording data file according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a flow chart of identifying the effective value of abnormal light CT analog quantity according to an embodiment of the present invention; Figure 4 It is another flow chart of a method for monitoring and evaluating abnormality of optical CT analog quantities in a converter station according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of an abnormal monitoring and evaluation system for optical CT analog quantities of a converter station according to an embodiment of the present invention; Figure 6It is another structural schematic diagram of an abnormal monitoring and evaluation system for optical CT analog quantities of a converter station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "first" and "second" etc. are used in the present invention to distinguish different objects rather than to describe a specific order.

[0021] In the description of the present invention, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a method for monitoring and evaluating abnormality of optical CT analog quantities in a converter station, comprising the steps of: S1. Read the fault recording file of each DC control and protection host built in the converter station to obtain the optical CT analog data collected by each DC control and protection host; In the converter station, the optical CT data of the DC field area is stored in the DC control and protection host, while the optical CT data of the AC filter area is stored in the filter control and protection host. There are two main ways to view the optical CT analog quantity: one is online, that is, the program monitors the data points online; the other is offline, that is, by viewing the built-in fault recording file, the data content is obtained. This step reads the fault recording file of each DC control and protection host built into the converter station based on the keyword retrieval method to obtain the optical CT analog data collected by each DC control and protection host. The optical CT analog data includes the optical CT analog quantities collected by each optical CT in the DC field area of ​​the converter station at different sampling times.

[0023] It should be noted that the built-in fault recording file of the DC control protection host in the converter station is in the standard COMTRADE format (a recording data format), which consists of three formats of files. Among them, the file with the suffix CFG is the channel configuration file, which configures the name of the optical CT; the file with the suffix DAT is the recording data file. A recording data file includes multiple data channels, and each data channel represents an optical CT. A recording data file includes multiple sampling points, each sampling point includes the sampling point sequence number, sampling time and sampling data. The sampling data includes the optical CT analog quantity collected by multiple optical CTs, which can be seen in Figure 2 In this embodiment, the size of an optical CT analog quantity is two bytes. It can be understood that a sampling point is a basic unit in a wave recording data file, which represents the sampling data at a specific moment.

[0024] S2, calculating the effective value of the light CT simulation quantity, the maximum value of the light CT simulation quantity, and the minimum value of the light CT simulation quantity corresponding to each light CT in each light CT simulation quantity data; The effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range. Specifically, the root mean square value of the plurality of optical CT analog quantities collected by the optical CT within the preset time range is calculated, and the root mean square value is characterized as the effective value of the optical CT analog quantity corresponding to the optical CT.

[0025] The preset time range starts from the second power frequency cycle and ends at the Nth power frequency cycle, where N is an integer greater than 2. In this embodiment, the preset time range starts from the second power frequency cycle and ends at the sixth power frequency cycle, that is, the preset time range is 5 power frequency cycles, and the sampling frequency is 50 Hz, each power frequency cycle is 20 ms, and one optical CT analog quantity is collected in each power frequency cycle, then 5 optical CT analog quantities are collected within the preset time range, and the root mean square values ​​of the 5 optical CT analog quantities are calculated to obtain the corresponding effective value of the optical CT analog quantity.

[0026] It can be understood that the maximum value of the optical CT simulation is the maximum value of the optical CT simulation collected by the same optical CT at different sampling times, and the minimum value of the optical CT simulation is the minimum value of the optical CT simulation collected by the same optical CT at different sampling times.

[0027] S3, identifying abnormal data in the optical CT analog data collected by each DC control protection host based on a preset abnormal data detection rule; The preset abnormal data detection rules include identifying abnormal light CT analog quantity effective values ​​based on comparison of the effective values ​​of light CT analog quantities corresponding to the same light CT in each light CT analog quantity data, identifying abnormal light CT analog quantity maximum values ​​based on comparison of the effective values ​​of light CT analog quantities corresponding to each light CT in each light CT analog quantity data with the maximum value of light CT analog quantities, identifying abnormal light CT analog quantity minimum values ​​based on comparison of the effective values ​​of light CT analog quantities corresponding to each light CT in each light CT analog quantity data with the minimum value of light CT analog quantities, and identifying abnormal light CT analog quantities based on comparison of the light CT analog quantities collected by each light CT in each light CT analog quantity data at different sampling times with a first preset threshold value.

[0028] like Figure 3 As shown, the method for identifying abnormal light CT analog quantity effective value based on comparison of light CT analog quantity effective value corresponding to the same light CT in each light CT analog quantity data includes the following steps: S301, arranging the effective values ​​of the optical CT analog quantity corresponding to the same optical CT in each optical CT analog quantity data according to the arrangement order of the DC control and protection host in the converter station, and representing the effective value of the optical CT analog quantity in the middle position as a reference value; S302, based on the comparison between the effective value of the light CT analog quantity corresponding to the same light CT in each light CT analog quantity data and the reference value, when the comparison result is that the difference between the effective value of the light CT analog quantity and the reference value is not within the first preset range, the effective value of the light CT analog quantity is an abnormal light CT analog quantity effective value.

[0029] In this embodiment, the first preset range is 0 to 0.5% of the reference value. That is, when the difference between the effective value of the light CT analog value and the reference value exceeds 0.5% of the reference value, the effective value of the light CT analog value is identified as an abnormal effective value of the light CT analog value.

[0030] The abnormal light CT analog value maximum value is identified based on the comparison between the light CT analog value effective value corresponding to each light CT in each light CT analog value data and the light CT analog value maximum value. Specifically, when the comparison result is that the difference between the light CT analog value maximum value corresponding to each light CT in each light CT analog value data and the light CT analog value effective value is not within the second preset range, the light CT analog value maximum value is the abnormal light CT analog value maximum value.

[0031] The second preset range of this embodiment is 0 to 5% of the effective value of the light CT simulation value. That is, when the maximum value of the light CT simulation value exceeds 105% of the effective value of the light CT simulation value, the maximum value of the light CT simulation value is identified as the abnormal maximum value of the light CT simulation value.

[0032] The abnormal light CT simulation minimum value is identified based on the comparison between the light CT simulation effective value corresponding to each light CT in each light CT simulation data and the light CT simulation minimum value. Specifically, when the comparison result is that the difference between the light CT simulation effective value corresponding to each light CT in each light CT simulation data and the light CT simulation minimum value is not within the third preset range, the light CT simulation minimum value is the abnormal light CT simulation minimum value.

[0033] The third preset range of this embodiment is 0 to 5% of the effective value of the light CT simulation. That is, when the minimum value of the light CT simulation is lower than 95% of the effective value of the light CT simulation, the minimum value of the light CT simulation is identified as an abnormal minimum value of the light CT simulation.

[0034] The abnormal light CT analog quantity is identified based on the comparison between the light CT analog quantity collected by each light CT at different sampling times in each light CT analog quantity data and the first preset threshold value. Specifically, when the comparison result is that the deviation between the light CT analog quantity collected by each light CT at different sampling times in each light CT analog quantity data and the first preset threshold value exceeds 5%, the light CT analog quantity is an abnormal light CT analog quantity.

[0035] In this embodiment, the first preset threshold is the optical CT rated value. That is, when the deviation between the optical CT analog value and the corresponding optical CT rated value exceeds 5%, the optical CT analog value is identified as an abnormal optical CT analog value.

[0036] The preset abnormal data detection rule also includes identifying abnormal differential current based on the comparison between each differential current in the DC field area in the converter station and the second preset threshold value. Specifically, when the comparison result is that each differential current in the DC field area in the converter station exceeds the second preset threshold value, the differential current is an abnormal differential current.

[0037] The second preset threshold in this embodiment is 50 A. That is, when the differential current in the DC field area in the converter station exceeds 50 A, the differential current is identified as an abnormal differential current.

[0038] The preset abnormal data detection rule also includes identifying an abnormal zero drift value based on a comparison between the zero drift value of each light CT analog quantity in each light CT analog quantity data and a third preset threshold value. Specifically, when the comparison result is that the zero drift value of each light CT analog quantity in each light CT analog quantity data exceeds the third preset threshold value, the zero drift value is an abnormal zero drift value.

[0039] The third preset threshold value of this embodiment is 1% of the optical CT analog quantity rated value. That is, when the zero drift value of the optical CT analog quantity exceeds 1% of the optical CT analog quantity rated value, the zero drift value is identified as an abnormal zero drift value. It should be noted that the optical CT analog quantity rated values ​​in different areas of the converter station are different, and the optical CT analog quantity rated value in the DC field area is 5000A, so the third preset threshold value is actually 50A.

[0040] like Figure 4 As shown, after step S3, the abnormal monitoring and evaluation method of the converter station optical CT analog quantity in the embodiment of the present invention further includes the steps of: S4. Visualize the optical CT analog data collected by each DC control and protection host, and highlight the identified abnormal data.

[0041] Specifically, the optical CT analog data collected by each DC control and protection host is visualized based on the Excel tool, and the identified abnormal data is displayed in bold, as shown in Table 1.

[0042] Table 1 Analysis of effective value data of some optical CT analog quantities in a converter station Among them, PPR1A, PPR1B, PPR1C, PCP1A and PCP1B are the names of DC control and protection hosts, IDCIP, IDC2P, IDC1N, IDC2N, IDL, INBS, IDNC and IDNE are the names of optical CTs, and each data is the effective value of optical CT analog quantity under different optical CTs of different DC control and protection hosts, in ampere (A). When the difference between the effective value of optical CT analog quantity and the reference value exceeds 0.5% of the reference value, the effective value of optical CT analog quantity is identified as the abnormal effective value of optical CT analog quantity, and the identified abnormal effective value of optical CT analog quantity is displayed in bold.

[0043] The embodiment of the present invention provides an abnormal monitoring and evaluation method for optical CT analog quantities of a converter station. Based on a fault recording file built into a DC control and protection host, the method realizes automatic collection of optical CT analog quantity data of each DC control and protection host. Based on a preset abnormal data detection rule, the method realizes automatic analysis such as horizontal comparison of effective values ​​of optical CT analog quantities corresponding to the same optical CT between DC control and protection hosts and vertical comparison of optical CT analog quantities collected by the same optical CT at different times. The method can automatically identify abnormal data and effectively evaluate the accuracy of optical CT analog quantities.

[0044] Based on the above abnormal monitoring and evaluation methods, such as Figure 5 As shown, an embodiment of the present invention provides an abnormal monitoring and evaluation system for analog quantities of optical CTs in converter stations, including: The data acquisition module 1 is used to read the fault recording file of each DC control and protection host built in the converter station, and obtain the optical CT analog data collected by each DC control and protection host, wherein the optical CT analog data includes the optical CT analog data collected by each optical CT in the DC field area of ​​the converter station at different sampling times; A data calculation module 2 is used to calculate the effective value of the light CT analog quantity corresponding to each light CT in each light CT analog quantity data, the maximum value of the light CT analog quantity and the minimum value of the light CT analog quantity, wherein the effective value of the light CT analog quantity is obtained based on the calculation and processing of a plurality of light CT analog quantities collected by the corresponding light CT within a preset time range; An abnormality detection module 3, used to identify abnormal data in the optical CT analog data collected by each DC control protection host based on a preset abnormal data detection rule; Among them, the preset abnormal data detection rules include identifying abnormal light CT analog effective values ​​based on comparing the effective values ​​of light CT analog quantities corresponding to the same light CT in each light CT analog quantity data, identifying abnormal light CT analog maximum values ​​based on comparing the effective values ​​of light CT analog quantities corresponding to each light CT in each light CT analog quantity data with the maximum value of light CT analog quantities, identifying abnormal light CT analog minimum values ​​based on comparing the effective values ​​of light CT analog quantities corresponding to each light CT in each light CT analog quantity data with the minimum value of light CT analog quantities, and identifying abnormal light CT analog quantities based on comparing the light CT analog quantities collected by each light CT in each light CT analog quantity data at different sampling times with a first preset threshold value.

[0045] Furthermore, if Figure 6 As shown, an abnormal monitoring and evaluation system for analog quantity of optical CT in a converter station according to an embodiment of the present invention further includes: The data display module 4 is used to visualize the optical CT analog data collected by each DC control and protection host, and highlight the identified abnormal data.

[0046] It should be noted that each module in the above-mentioned abnormal monitoring and evaluation system for the optical CT analog quantity of a converter station can be fully or partially implemented by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. For the specific definition of an abnormal monitoring and evaluation system for the optical CT analog quantity of a converter station, please refer to the definition of an abnormal monitoring and evaluation method for the optical CT analog quantity of a converter station mentioned above. The two have the same functions and effects, which will not be repeated here.

[0047] In summary, an abnormal monitoring and evaluation method and system for optical CT analog quantities of a converter station according to an embodiment of the present invention realizes automatic collection of optical CT analog quantity data of each DC control and protection host based on a fault recording file built into a DC control and protection host; based on preset abnormal data detection rules, automatic analysis such as horizontal comparison of effective values ​​of optical CT analog quantities corresponding to the same optical CT between DC control and protection hosts and vertical comparison of optical CT analog quantities collected by the same optical CT at different times are realized, and abnormal data can be automatically identified, and the accuracy of optical CT analog quantities can be effectively evaluated.

[0048] Each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment can be directly referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. It should be noted that the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for monitoring and evaluating abnormality of optical CT analog quantity in a converter station, characterized in that: include: Read the fault recording file of each DC control and protection host built in the converter station to obtain the optical CT analog data collected by each DC control and protection host, wherein the optical CT analog data includes the optical CT analog data collected by each optical CT in the DC field area of ​​the converter station at different sampling times; Calculating an effective value of an optical CT analog quantity, a maximum value of an optical CT analog quantity, and a minimum value of an optical CT analog quantity corresponding to each optical CT in each of the optical CT analog quantity data, wherein the effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range; Identify abnormal data in the optical CT analog data collected by each of the DC control protection hosts based on a preset abnormal data detection rule; Among them, the preset abnormal data detection rules include identifying abnormal light CT analog quantity effective values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data, identifying abnormal light CT analog quantity maximum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the maximum value of the light CT analog quantity, identifying abnormal light CT analog quantity minimum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the minimum value of the light CT analog quantity, and identifying abnormal light CT analog quantity based on comparison of the light CT analog quantity collected by each of the light CT in each of the light CT analog quantity data at different sampling times with a first preset threshold value.

2. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The preset abnormal data detection rule also includes identifying abnormal differential currents based on a comparison between each differential current in the DC field area within the converter station and a second preset threshold.

3. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The preset abnormal data detection rule also includes identifying an abnormal zero drift value based on a comparison between the zero drift value of each of the optical CT analog quantity in each of the optical CT analog quantity data and a third preset threshold.

4. The abnormality monitoring and evaluation method according to any one of claims 1 to 3, characterized in that: After identifying abnormal data in the optical CT analog data collected by each DC control protection host based on the preset abnormal data detection rule, the method further includes: The optical CT analog data collected by each DC control protection host is visualized, and the identified abnormal data is highlighted.

5. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the optical CT within a preset time range, including: Calculate the root mean square value of a plurality of optical CT analog quantities collected by the optical CT within a preset time range, and characterize the root mean square value as the effective value of the optical CT analog quantity corresponding to the optical CT, wherein the preset time range starts from the second power frequency cycle and ends at the Nth power frequency cycle, and N is an integer greater than 2.

6. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The comparing and identifying the abnormal light CT analog quantity effective value based on the light CT analog quantity effective value corresponding to the same light CT in each light CT analog quantity data includes: Arrange the effective value of the optical CT analog quantity corresponding to the same optical CT in each of the optical CT analog quantity data according to the arrangement order of the DC control and protection host in the converter station, and characterize the effective value of the optical CT analog quantity in the middle position as a reference value; Based on the comparison between the effective value of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data and the reference value, when the comparison result is that the difference between the effective value of the light CT analog quantity and the reference value is not within a first preset range, the effective value of the light CT analog quantity is an abnormal light CT analog quantity effective value.

7. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The method of identifying the abnormal maximum value of the optical CT simulation value based on the comparison between the effective value of the optical CT simulation value corresponding to each optical CT in each optical CT simulation value data and the maximum value of the optical CT simulation value includes: When the comparison result is that the difference between the maximum light CT simulation value corresponding to each light CT in each light CT simulation value data and the effective value of the light CT simulation value is not within the second preset range, the maximum light CT simulation value is the abnormal maximum light CT simulation value.

8. The abnormal monitoring and evaluation method according to claim 1, characterized in that: The step of identifying the abnormal light CT analog quantity minimum value based on the comparison between the light CT analog quantity effective value corresponding to each light CT in each light CT analog quantity data and the light CT analog quantity minimum value comprises: When the comparison result is that the difference between the effective value of the light CT simulation quantity corresponding to each light CT in each of the light CT simulation quantity data and the minimum value of the light CT simulation quantity is not within the third preset range, the minimum value of the light CT simulation quantity is an abnormal minimum value of the light CT simulation quantity.

9. A converter station optical CT analog quantity abnormal monitoring and evaluation system, characterized in that: include: A data acquisition module is used to read the fault recording file of each DC control and protection host built in the converter station, and obtain the optical CT analog data collected by each DC control and protection host, wherein the optical CT analog data includes the optical CT analog data collected by each optical CT in the DC field area of ​​the converter station at different sampling times; a data calculation module, used to calculate an effective value of an optical CT analog quantity, a maximum value of an optical CT analog quantity, and a minimum value of an optical CT analog quantity corresponding to each optical CT in each of the optical CT analog quantity data, wherein the effective value of the optical CT analog quantity is obtained based on the calculation and processing of a plurality of optical CT analog quantities collected by the corresponding optical CT within a preset time range; An abnormality detection module, used for identifying abnormal data in the optical CT analog data collected by each of the DC control protection hosts based on preset abnormal data detection rules; Among them, the preset abnormal data detection rules include identifying abnormal light CT analog quantity effective values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to the same light CT in each of the light CT analog quantity data, identifying abnormal light CT analog quantity maximum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the maximum value of the light CT analog quantity, identifying abnormal light CT analog quantity minimum values ​​based on comparison of the effective values ​​of the light CT analog quantity corresponding to each of the light CT in each of the light CT analog quantity data with the minimum value of the light CT analog quantity, and identifying abnormal light CT analog quantity based on comparison of the light CT analog quantity collected by each of the light CT in each of the light CT analog quantity data at different sampling times with a first preset threshold value.

10. The abnormal monitoring and evaluation system according to claim 9, characterized in that: Also includes: The data display module is used to visualize the optical CT analog data collected by each DC control protection host and highlight the identified abnormal data.

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