CN116184108B - Fault detection method, device and storage medium - Google Patents
Fault detection method, device and storage medium Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to the technical field of power system detection and discloses a fault detection method, a fault detection system, a fault detection device and a fault detection storage medium. The invention comprises the following steps: collecting real-time current I Real world The method comprises the steps of carrying out a first treatment on the surface of the Determining all real-time currents I acquired within a present time interval T Real world Is N, and will correspond to N real-time currents I Real world As a first sequence; calculating the absolute value of the difference between the first sequence and the first set value to obtain a second sequence, and calculating the average value to obtain the average value delta I of the current variation av The method comprises the steps of carrying out a first treatment on the surface of the According to the current variation mean value delta I av Determining a fault detection starting criterion, and calculating an average value by using the absolute value of the first sequence when the fault detection starting criterion is met to obtain a protection judgment current I op The method comprises the steps of carrying out a first treatment on the surface of the Determining current I based on protection op And determining the fault type according to the magnitude of the second set value. The invention calculates the average value delta I of the current variation av The invention has the advantages of short fault judging time, high detection sensitivity and high reliability.
Description
Technical Field
The invention relates to the technical field of power system detection, in particular to a fault detection method, a fault detection system, a fault detection device and a fault detection storage medium.
Background
High-voltage direct current (high voltage direct current, HVDC) power transmission has the advantages of large power transmission capacity, small loss and the like, and is widely applied to long-distance power transmission, asynchronous interconnection and the like of a modern power system. The HVDC transmission line often passes through complex terrains and runs in extreme climatic environments, and the probability of faults such as single pole faults and double pole faults is high.
At present, the high-voltage direct-current transmission line mostly uses traveling wave protection as main protection and current differential protection as backup protection. The traveling wave protection depends on reliable identification of a traveling wave head, so that the wave head is difficult to detect when the high-resistance ground fault exists, and the problem of insufficient sensitivity exists; the current differential protection is to avoid the influence of the transient charge and discharge current of the distributed capacitance of the transmission line after the fault, the action delay is long, and the fault can not be rapidly removed. Aiming at the defects of the traditional high-voltage transmission line protection, a new scheme for single-ended protection of the high-voltage direct-current transmission line is provided based on transient voltage quantity, but the scheme has the problems of extremely high requirements on sampling frequency and processing capacity of the device, low signal energy used for fault discrimination and the like.
The first literature, namely full-line quick-acting protection of a high-voltage direct-current transmission line by single-end current, proposes a principle of full-line quick-acting protection of the single-end quantity of the direct-current transmission line according to impedance characteristic differences of direct-current filtering links when faults occur in and out of a direct-current transmission line region; and the second document (Protection scheme for high-voltage direct current transmission lines based on transient AC current) provides a principle of protecting single-ended transient current of a high-voltage direct-current transmission line according to the difference of current amplitude fluctuation of specific frequency during internal and external faults; however, since the current of the direct current line side current divider is easy to saturate, the two protection schemes still have the problems of insufficient reliability and sensitivity.
Disclosure of Invention
The invention provides a fault detection method, a fault detection system, a fault detection device and a storage medium, and aims to at least solve one of the technical problems in the prior art. Therefore, the invention provides a fault detection method, a system, a device and a storage medium with high reliability and sensitivity, which can not only rapidly identify faults and start protection, but also rapidly identify the fault type of a line.
In a first aspect, the present invention provides a fault detection method applied to a high voltage dc transmission line with a dc filter branch, including the steps of:
collecting the real time of the branch where the capacitor to be tested in the direct current filter branch is locatedCurrent I Real world ；
Determining all of said real-time currents I acquired during a present time interval T Real world Is N, and will correspond to N of said real-time currents I Real world As a first sequence;
calculating the absolute value of the difference between the first sequence and a first set value to obtain a second sequence, and calculating the average value of the second sequence to obtain the average value delta I of the current variation av ；
According to the current variation mean value delta I av Determining a fault detection starting criterion, and calculating an average value according to the absolute value of the first sequence when the fault detection starting criterion is met to obtain a protection judging current I op ；
Determining a current I based on the protection op And determining the fault type according to the magnitude of the second set value.
According to some embodiments of the present invention, the step of collecting, in real time, the real-time current I of the branch where the capacitor to be measured in the dc filter branch is located includes the following steps:
determining the sampling frequency f s ；
According to the sampling frequency f s Collecting the real-time current I in real time Real world 。
According to some embodiments of the invention, the sampling frequency f s 4000-10000 Hz, and the time interval T is 3-5 ms.
According to some embodiments of the invention, the current variation average value ΔI av The step of determining the fault detection starting criterion comprises the following steps:
determining a third set value;
when the current change amount is equal to delta I av And if the fault detection starting criterion is larger than the third set value, the fault detection starting criterion is met.
According to some embodiments of the invention, the step of determining the third setting value comprises the steps of:
the third set value is the setting value I of the fault detection starting criterion set1 ；
Acquiring a current value I of the capacitor to be tested in normal operation nor The current value I nor Is determined to be the first set value, and，f s for the real-time current I Real world F is the sampling frequency of (f) 0 And the power frequency of the alternating current power grid at the two ends of the high-voltage direct current power transmission line.
According to some embodiments of the invention, the fault types include intra-zone faults and out-of-zone faults.
According to some embodiments of the invention, the determining the current I according to the protection op The step of determining the fault type according to the magnitude of the second set value comprises the following steps:
obtaining the maximum current I allowed to pass through the direct current filter branch in normal operation max Is a numerical value of (2);
the second set value is the setting value I of the fault type identification criterion in the area set2 Determining the setting value I set2 For maximum current I max Is 5 times as large as that of (a);
judging the protection judging current I op The magnitude of the second set value is equal to the protection judgment current I op When the fault detection value is larger than the second set value, judging that the fault exists in the area; when the protection judges the current I op And when the fault detection value is smaller than or equal to the second set value, judging that the fault is out of the area.
In a second aspect, the invention provides a fault detection system, which is applied to a high-voltage direct-current transmission line provided with a direct-current filter branch, and comprises a parameter acquisition module, a first calculation module, a second calculation module, a third calculation module and a fourth calculation module; the parameter acquisition module is used for acquiring real-time current I of a branch where a capacitor to be detected in the direct current filter branch is located in real time Real world The method comprises the steps of carrying out a first treatment on the surface of the The first calculation module is used for determining all the real-time currents I acquired in the current time interval T Real world Is N, and will correspond to N of said real-time currents I Real world As a first sequence; the second calculation module is used for calculating the absolute value of the difference between the first sequence and a first set value to obtain a second sequence, and calculating the average value of the second sequence to obtain the average value delta I of the current variation av The method comprises the steps of carrying out a first treatment on the surface of the The third calculation module is used for calculating the current variation average value delta I according to the current variation average value delta I av Determining a fault detection starting criterion, and calculating an average value according to the absolute value of the first sequence when the fault detection starting criterion is met to obtain a protection judging current I op The method comprises the steps of carrying out a first treatment on the surface of the The fourth calculation module is used for judging the current I according to the protection op And determining the fault type according to the magnitude of the second set value.
In a third aspect, the present invention provides a computer apparatus comprising a memory and a processor implementing the above-described fault detection method when executing a computer program stored in the memory.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described fault detection method.
The beneficial effects of the invention are as follows: by calculating the current variation mean value delta I of the capacitor to be measured in the DC filter branch av Can rapidly judge whether the high-voltage direct-current transmission line has faults or not, and can judge the current I according to the protection of the capacitor to be tested op The fault type can be rapidly determined by the size of the second set value, and the invention has the advantages of short fault judging time, high detection sensitivity and high reliability.
Drawings
FIG. 1 is a flow chart of steps of a fault detection method of the present invention;
fig. 2 is a schematic diagram of a bipolar high-voltage dc transmission line system according to the present invention;
FIG. 3 is a schematic diagram of the topology of the DC filtering link of FIG. 2;
FIG. 4 is a schematic diagram of a fault detection system according to the present invention;
fig. 5 is a schematic structural diagram of a computer device according to the present invention.
Reference numerals: the system comprises a direct current filter 100, a parameter acquisition module 210, a first calculation module 220, a second calculation module 230, a third calculation module 240, a fourth calculation module 250, a memory 320 and a processor 310.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present invention.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. It should be noted that, unless otherwise specified, when a feature is referred to as being "electrically connected" or "electrically connected" with another feature, the two features may be directly connected through pins, or connected through cables, or may be connected through a wireless transmission manner. The specific electrical connection mode belongs to a general mode of a person skilled in the art, and the person skilled in the art can realize connection according to the need. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could also be termed a second element, and, similarly, a second element could also be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
Referring to fig. 1, in a first aspect, the present invention provides a fault detection method applied to a hvdc transmission line having a branch of a dc filter 100 installed thereon, comprising the steps of:
step S100, collecting real-time current I of a branch where a capacitor to be tested in a branch of the DC filter 100 is located in real time Real world ；
Collecting real-time current I Real world The real-time current I can be acquired by continuously and uninterruptedly acquiring the current I in real time, or at set interval time points or at set sampling frequency, and the current I can be acquired synchronously after the system acquisition Real world The numerical value of the corresponding time node and the related data information of the corresponding time node are stored so that the system can be conveniently called when needed;
step S200, determining all real-time currents I collected in the current time interval T Real world Is N, and will correspond to N real-time currents I Real world As a first sequence;
this step can be based on the data collected in step S100 and determine the time interval T, confirm the data and quantity of the real-time current I collected in the corresponding time interval T, and then form a first sequence of I S1 ＝{I Real world (1),I Real world (2),…,I Real world (j),…,I Real world (N); j is an integer, 1,2,3, … … and N; n is I S1 Total number of points in the sequence;
step S300, calculating the absolute value of the difference between the first sequence and the first set value to obtain a second sequence, and calculating the average value of the second sequence to obtain the average value delta I of the current variation av ；
Specifically, according to the first sequence I S1 ＝{I Real world (1),I Real world (2),…,I Real world (j),…,I Real world (N); the difference is calculated from a first set value, which in this embodiment is the current value I of the capacitor under test during normal operation nor ThenThe second sequence is I S2 ＝{|I Real world (1)-I nor |,|I Real world (2)-I nor |,…,|I Real world (j)-I nor |,…,|I Real world (N)-I nor I and then averaged, the validation can be calculated as follows:
namely, equation (1) is used to find |I Real world (1)-I nor |、|I Real world (2)-I nor |、…、|I Real world (j)-I nor |、…、|I Real world (N)-I nor Average value of I to find current variation average value DeltaI av Wherein N is the total sampling point number in the time interval T, and the value range of the time interval T is 3-5 ms;
step S400, according to the current variation average value delta I av Determining a fault detection starting criterion, and calculating an average value by using the absolute value of the first sequence when the fault detection starting criterion is met to obtain a protection judgment current I op ；
Specifically, according to the first sequence I S1 ＝{I Real world (1),I Real world (2),…,I Real world (j),…,I Real world (N) } to obtain an absolute value, and then averaging to obtain a protection determination current I op The method comprises the steps of carrying out a first treatment on the surface of the The calculation confirmation may be performed as follows:
namely, equation (2) is used to find |I Real world (1)|、|I Real world (2)|、…、|I Real world (j)|、…、|I Real world Average value of (N) | to find protection determination current I op Determining the current I according to the protection op To determine whether or not the failure detection start criterion is satisfied, specifically, when the current variation amount average value Δi av When the fault detection starting criterion is larger than the third set value, the fault detection starting criterion is established;
step S500 rootAccording to the protection judgment current I op Determining the fault type with the magnitude of the second set value;
specifically, the determination current I obtained in step S400 is used op And a second set value, wherein in the present embodiment, the second set value may be the set value I of the intra-area fault type identification criterion set2 The method comprises the steps of carrying out a first treatment on the surface of the When the protection judges the current I op When the set value is larger than the second set value, judging that the fault exists in the area; when the protection judges the current I op And if the set value is smaller than or equal to the second set value, judging that the fault is out of the area.
Thus, by determining the current variation mean value Δi of the capacitor under test in the branch of the dc filter 100 av Can determine whether the fault detection starting is satisfied, and the average value delta I of the current variation of the capacitor to be detected av The judgment is carried out, whether the fault occurs can be rapidly and accurately judged, if so, the protection is started, and meanwhile, the protection judgment current I is further judged op The invention can quickly and accurately judge and confirm the fault in the area or the fault outside the area compared with the existing protection principle of the high-voltage direct-current transmission line, and has higher reliability and sensitivity.
In particular, it should be noted that reference may be made to FIG. 2, L sr The inductance of the smoothing reactor of the direct-current transmission line; l (L) 1 、L 2 、L 3 Is an inductive element; c (C) 1 、C 2 、C 3 The high-voltage, medium-voltage and low-voltage capacitive elements of the branch of the direct current filter 100 are respectively; i is the medium-voltage capacitor element C of the filter branch 2 A current; AC is an alternating current system power supply, and DC is a direct current circuit; the capacitor to be measured is capacitor C 2 Or capacitor C 3 In determining the first, second and third set-points, reference can be made to circuit hardware parameters involved in the application environment and to the corresponding capacitances C 2 Or capacitor C 3 Is determined by the parameters of (a); high voltage capacitor C compared to DC filter 100 1 Medium voltage capacitor C 2 Or a low-voltage capacitor C 3 The invention has no problem of current mutual inductance saturation during judgment because of smaller currentThe judgment can be more accurate, the error can be smaller, and the reliability is higher.
It should be noted that, when the step S400 detects that the high-voltage direct-current transmission line is continuously normal in the step S100 to the step S400, the step S500 is continuously executed; under normal conditions, step S100 is continuously performed, step S200 is performed after a time interval T passes each time, and steps 300 and S400 are rapidly performed to rapidly determine whether the fault detection starting criterion is met, if yes, protection is started, step S500 is rapidly performed, the fault type is rapidly determined, if the fault detection starting criterion in step S400 is not met, step S200 is returned to continuously perform the determination to continuously monitor whether the high-voltage direct-current transmission line is normally operated.
In some embodiments of the present invention, step S100 includes the steps of:
step S110, determining the sampling frequency f s ；
Step S120, according to the sampling frequency f s Collecting real-time current I in real time Real world The method comprises the steps of carrying out a first treatment on the surface of the Therefore, when the HVDC transmission line starts to work, the system will operate at the sampling frequency f s As a reference, continuously and in real time collecting the real-time current I of the capacitor to be tested Real world The method comprises the steps of carrying out a first treatment on the surface of the While the corresponding time node and the specific current level are recorded.
In some embodiments of the invention, the sampling frequency f s 4000-10000 Hz, and the time interval T is 3-5 ms.
In some embodiments of the invention, the current variation average ΔI is based on av The step of determining the fault detection starting criterion comprises the following steps:
step S410, determining a third set value;
step S420, when the current variation average value DeltaI av When the fault detection starting criterion is larger than the third set value, the fault detection starting criterion is established; wherein when the current change amount is equal to delta I av If the detected value is less than or equal to the third set value, the fault detection starting criterion is not satisfied, and the process returns to step S200.
That is, when the fault detection starting criterion of the step S400 is not satisfied, the step S200 is continuously executed to determine whether the data collected in the next time interval T satisfies the corresponding condition, whether the protection needs to be started, and when the protection does not need to be started, the steps S200 to S400 are continuously and repeatedly repeated.
In some embodiments of the present invention, the step of determining the third set point comprises the steps of:
step S411, setting value I of the fault detection starting criterion is the third setting value set1 ；
Step S412, obtaining the current value I of the capacitor under test during normal operation nor Current value I nor Is determined as a first set value, andwherein f s For real-time current I Real world F is the sampling frequency of (f) 0 Is the power frequency of the alternating current power grid at the two ends of the high-voltage direct current power transmission line.
Specifically, in the present embodiment, the fault detection initiation criterion is
ΔI av ＞I set1 (3)；
I.e. when the current variation is equal to delta I av And if the fault detection starting criterion is larger than the third set value, the fault detection starting criterion is established.
In the present embodiment of the present invention, in the present embodiment,the application of the formula can protect the reduction degree of the signals along with the sampling frequency f s The higher the rise, the better the change of the protection signal can be reflected by the data collected at high frequency. Therefore, the protection selects a smaller setting value I set1 The requirements of the reliability and the sensitivity of the protection can be met. Power frequency f 0 And sampling frequency f s Setting value I combined with determination of protection starting criterion set1 The starting protection of the HVDC transmission line can be performed according to the sampling frequency f s The self-adaptive adjustment is realized to improve the reliability and the sensitivity of the protection of the high-voltage direct-current transmission line and shorten the protection judging time.
In some embodiments of the present invention, step S500 includes the steps of:
step S510, obtaining the maximum current I allowed to pass through the branch of the DC filter 100 during normal operation max Is a numerical value of (2);
step S520, setting value I of the fault type identification criterion in the zone as the second setting value set2 Determining a setting value I set2 For maximum current I max Is 5 times as large as that of (a);
step S530, judging the protection judgment current I op With the second set value, when the protection judging current I op When the set value is larger than the second set value, judging that the fault exists in the area; when the protection judges the current I op And if the set value is smaller than or equal to the second set value, judging that the fault is out of the area.
Specifically, in the present embodiment, the intra-zone fault identification criterion is
I op ＞I set2 (4)；
I.e. when protection determines current I op When the protection judgment current I is greater than the second set value, the fault is an intra-zone fault, and when the protection judgment current I is op And if the fault is smaller than or equal to the second set value, the fault is an out-of-zone fault.
Referring to fig. 2 and fig. 3, the distribution is a schematic system diagram of the embodiment specifically applied to a ±500kV bipolar high-voltage direct-current transmission line and a schematic topology structure diagram of a corresponding direct-current filtering link. The rated capacity of the direct current transmission system is 2000MW; rated current is 2kA; f (f) x Representing faults f at X from M end on direct current line R1 、f R2 For rectifying side failure point, f I1 —f I2 Is an inversion side fault point; m, N the dc link ends; AC is an AC system power supply; the high-voltage direct-current transmission line adopts a frequency-dependent parameter model, and the total length is 1000km; power frequency f of ac power network at two ends of system 0 Is 50Hz; the data sampling frequency is 10kHz;12/24/36 three-tuning dc filter 100 parameters: c (C) 1 ＝1.64μF，C 2 ＝4.48μF，C 3 ＝5.81μF，L 1 ＝10.869mH，L 2 ＝10.384mH，L 3 =2.06 mH. Referring to fig. 3, the direct current filtering is acquired by the current acquisition deviceThe corresponding capacitance C of the branch element of the device 100 2 Real-time current I of (2) Real world Sampling frequency f s At 8000Hz, the positive direction of the current is defined as the direction indicated by the arrow in FIG. 3; the time interval T is 3ms, the first set value is the capacitor C 2 Operating current value I during normal operation nor Current value I nor 20A, the second set value is the set value I of the fault type identification criterion in the area set2 In the present embodiment, the branch of the dc filter 100 allows the maximum current I to pass max For 20A, consider the most severe case of out-of-zone failure, I set2 ＝5I max =100deg.A; and the third set value is the setting value I of the fault detection starting criterion set1 ，
In order to analyze the influence of different transition resistances and fault distances on the protection method of the invention, reference can be made to table 1, the fault detection method is combined for detection and calculation, and the simulation results of the protection actions in the case of faults of different types of positive electrodes are given in table 1. In Table 1, max (ΔI av ) Representing the mean value delta I of the current variation in 5ms after fault av Is the maximum value of (2); max (I) op ) Indicating the current I within 5ms after the fault op Is a maximum value of (a).
TABLE 1 simulation results of protection actions at different types of in-zone faults
As can be seen from Table 1, the current variation means DeltaI at different fault locations and transition resistances av Maximum value max (Δi in the correspondence table av ) Are all larger than the protection starting threshold value (i.e. the third set value I set1 =10a), protection can reliably be started; current I op Maximum value max (I in the correspondence table op ) Is greater than the protection threshold (i.e. the second set value I set2 =100A), the protection achieves reliable action; when the fault position is unchanged, the starting current and the current I are protected op Decreasing with increasing transition resistance, butStill greater than the guard action threshold. Therefore, the method can realize the rapid identification of faults in the area and protect reliable actions.
In order to analyze the influence of different types of out-of-zone faults on the protection method of the present invention, reference may be made to table 2, and the detection and calculation are performed in combination with the fault detection method, and table 2 gives the simulation results of the protection actions in the case of different types of out-of-zone faults. In the table, max (ΔI av ) Representing the mean value delta I of the current variation in 5ms after fault av Is the maximum value of (2); max (I) op ) Indicating the current I within 5ms after the fault op Is a maximum value of (a).
TABLE 2 simulation results of protection actions at different types of out-of-zone faults
As can be seen from Table 2, in combination with FIG. 3, the rectifying side region is outside f R1 Outside of inversion side region f I1 Mean value delta I of current variation in different types of faults av I.e. maximum max (Δi in table 2 av ) Is greater than the protection start threshold (i.e. the third set value I set1 =10a), secure start-up is protected; and corresponding current I op I.e. maximum max (I in table 2 op ) Is far smaller than the protection action setting value (i.e. the second setting value I) set2 =100A), the protection is reliable.
It can be seen from the combination of table 1 and table 2 that the fault detection method adopted by the invention can not only rapidly identify fault detection, but also rapidly determine fault type, and has higher sensitivity and reliability.
Referring to fig. 4, in a second aspect, the present invention provides a fault detection system applied to a hvdc transmission line having a dc filter branch installed thereon, including a parameter obtaining module 210, a first calculating module 220, a second calculating module 230, a third calculating module 240, and a fourth calculating module 250; the parameter acquisition module 210 is configured to acquire, in real time, a real-time current I of a branch where a capacitor to be detected in the branch of the dc filter 100 is located; the first calculation module 220 is used for determining the current time interval TIs set to be the full real-time current I of Real world Is N, and will correspond to N real-time currents I Real world As a first sequence; the second calculation module 230 is configured to calculate a difference absolute value according to the first sequence and the first set value to obtain a second sequence, and calculate an average value of the second sequence to obtain a current variation average value Δi av The method comprises the steps of carrying out a first treatment on the surface of the The third calculation module 240 is configured to calculate a current variation average value Δi av Determining a fault detection starting criterion, and calculating an average value by using the absolute value of the first sequence when the fault detection starting criterion is met to obtain a protection judgment current I op The method comprises the steps of carrying out a first treatment on the surface of the The fourth calculation module 250 is used for determining the current I according to the protection op And determining the fault type according to the magnitude of the second set value.
It can be known that the content of the above-mentioned fault detection method embodiment is applicable to the system embodiment, and the functions specifically implemented by the system embodiment are the same as those of the above-mentioned fault detection method embodiment, and the beneficial effects achieved by the system embodiment are the same as those achieved by the above-mentioned fault detection method embodiment.
Referring to fig. 5, in a third aspect, the present invention provides a computer apparatus including a memory 320 and a processor 310, the processor 310 implementing the above-described fault detection method when executing a computer program stored in the memory 320.
Similarly, the content in the above-mentioned fault detection method embodiment is applicable to the embodiment of the present device, and the specific functions implemented by the embodiment of the present device are the same as those of the above-mentioned method embodiment, and the beneficial effects achieved by the embodiment of the above-mentioned fault detection method are the same as those achieved by the embodiment of the above-mentioned fault detection method.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon computer program instructions which, when executed by the processor 310, implement the fault detection method described above.
Similarly, the content of the fault detection method embodiment is applicable to the present embodiment, and the specific functions of the present embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the fault detection method embodiment.
It should be appreciated that the method steps in embodiments of the present invention may be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in non-transitory computer-readable memory. The fault detection method may use standard programming techniques. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes (or variations and/or combinations thereof) described herein may be performed under control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications), by hardware, or combinations thereof, collectively executing on one or more processors 310. The computer program includes a plurality of instructions executable by one or more processors.
Further, the fault detection method may be implemented in any type of computing platform operatively connected to a suitable, including, but not limited to, a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and so forth. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and/or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, which when read by a computer, is operable to configure and operate the computer to perform the processes described herein. Further, the machine readable code, or portions thereof, may be transmitted over a wired or wireless network. When such media includes instructions or programs that, in conjunction with a microprocessor or other data processor, implement the steps described above, the invention described herein includes these and other different types of non-transitory computer-readable storage media. The invention may also include the computer itself when programmed according to the methods and techniques of the present invention.
The computer program can be applied to the input data to perform the functions described herein, thereby converting the input data to generate output data that is stored to the non-volatile memory. The output information may also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on a display.
The present invention is not limited to the above embodiments, but can be modified, equivalent, improved, etc. by the same means to achieve the technical effects of the present invention, which are included in the spirit and principle of the present invention. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.
Claims (7)
1. The fault detection method is characterized by being applied to a high-voltage direct-current transmission line provided with a direct-current filter branch, and comprising the following steps of:
collecting real-time current I of a branch circuit where a capacitor to be detected in the direct current filter branch circuit is located in real time Real world ；
Determining all of said real-time currents I acquired during a present time interval T Real world Is N, and will correspond to N of said real-time currents I Real world As a first sequence;
calculating the absolute value of the difference between the first sequence and a first set value to obtain a second sequence, and calculating the average value of the second sequence to obtain the average value delta I of the current variation av ；
According to the current variation mean value delta I av Determining fault detection starting criteria, whenThe fault detection starting criterion is met, and the absolute value of the first sequence is used for calculating the average value to obtain the protection judgment current I op ；
Determining a current I based on the protection op Determining the fault type with the magnitude of the second set value;
said current change amount average value DeltaI av The step of determining the fault detection starting criterion comprises the following steps:
determining a third set value;
when the current change amount is equal to delta I av And if the fault detection starting criterion is larger than the third set value, the fault detection starting criterion is met.
2. The fault detection method as claimed in claim 1, wherein the real-time acquisition of the real-time current I of the branch in which the capacitor to be detected in the dc filter branch is located Real world This step comprises the steps of:
determining the sampling frequency f s ；
According to the sampling frequency f s Collecting the real-time current I in real time Real world 。
3. The fault detection method according to claim 2, wherein the sampling frequency f s 4000-10000 Hz, and the time interval T is 3-5 ms.
4. The fault detection method according to claim 1, wherein the step of determining the third set value includes the steps of:
the third set value is the setting value I of the fault detection starting criterion set1 ；
Acquiring a current value I of the capacitor to be tested in normal operation nor The current value I nor Is determined to be the first set value, andf s for the real-time current I Real world F is the sampling frequency of (f) 0 And the power frequency of the alternating current power grid at the two ends of the high-voltage direct current power transmission line.
5. The fault detection method according to any one of claims 1 to 4, wherein the fault types include intra-zone faults and out-of-zone faults.
6. A computer device comprising a memory and a processor, wherein the processor implements the fault detection method of any of claims 1 to 5 when executing a computer program stored in the memory.
7. A computer readable storage medium having stored thereon program instructions which, when executed by a processor, implement the fault detection method of any of claims 1 to 5.
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