CN114928020A - Intelligent protection operation fault auxiliary analysis method for power distribution network - Google Patents
Intelligent protection operation fault auxiliary analysis method for power distribution network Download PDFInfo
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- CN114928020A CN114928020A CN202210739422.5A CN202210739422A CN114928020A CN 114928020 A CN114928020 A CN 114928020A CN 202210739422 A CN202210739422 A CN 202210739422A CN 114928020 A CN114928020 A CN 114928020A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
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Abstract
The invention provides an auxiliary analysis method for an intelligent protection operation fault of a power distribution network, which is used for positioning the position of a fault point when the fault occurs; extracting relay protection equipment around the position of a fault point, acquiring constant value data of the relay protection equipment, and recording the constant value data as the current-level constant value data; acquiring fixed value data of relay protection equipment at positions corresponding to the upper and lower levels of a system where fault points are located, and recording the fixed value data as upper-level fixed value data and lower-level fixed value data; comparing the current-level fixed value data with stored standard fixed value data, obtaining a higher-level difference value according to the current-level fixed value data and the higher-level fixed value data, obtaining a lower-level difference value according to the current-level fixed value data and the lower-level fixed value data, and respectively comparing the higher-level difference value and the lower-level difference value with preset difference threshold values; performing fault auxiliary analysis according to the comparison result, and obtaining an auxiliary analysis result; and fault auxiliary analysis is carried out in cooperation according to the fixed value data between the upper-level system and the lower-level system, so that the accuracy of fault analysis can be ensured.
Description
Technical Field
The invention relates to the technical field of distribution network fault analysis, in particular to an intelligent protection operation fault auxiliary analysis method for a distribution network.
Background
The relay protection equipment is a very important secondary device in a power distribution network, and can ensure the safe operation of a power system, in the actual operation, the fixed value of the relay protection equipment can influence the normal operation of the relay protection equipment, and further influence the normal operation of the power system, so the fault analysis can be assisted through the detection of the fixed value, in the power system, all levels of relay protection equipment are operated in a mutual cooperation mode, the fixed value setting between the same relay protection equipment between an upper level and a lower level needs to be set in a mutual cooperation mode, when the fixed value of one relay protection equipment is changed, the fixed value change of the relay protection equipment of other levels can be possibly caused, and further the safe operation of the power system is influenced, however, the fixed value matching condition of the relay protection equipment of multiple levels is not analyzed in the current power system, and the fault analysis cannot be effectively assisted.
Disclosure of Invention
In view of this, the invention provides an intelligent protection operation fault auxiliary analysis method for a power distribution network, which can perform auxiliary analysis on faults through fixed value data of upper and lower relay protection devices.
The technical scheme of the invention is realized as follows:
an intelligent protection operation fault auxiliary analysis method for a power distribution network comprises the following steps:
step S1, positioning the fault point position when the fault occurs;
step S2, extracting relay protection equipment around the position of a fault point, and acquiring the fixed value data of the relay protection equipment and recording the fixed value data as the fixed value data of the current level;
step S3, acquiring the fixed value data of the relay protection equipment at the corresponding positions of the upper and lower stages of the system where the fault point position is located, and recording the fixed value data as the upper stage fixed value data and the lower stage fixed value data;
step S4, comparing the current-level fixed value data with the stored standard fixed value data, obtaining a higher-level difference value according to the current-level fixed value data and the higher-level fixed value data, obtaining a lower-level difference value according to the current-level fixed value data and the lower-level fixed value data, and comparing the higher-level difference value and the lower-level difference value with a preset difference threshold value respectively;
and step S5, performing fault auxiliary analysis according to the comparison result, and obtaining an auxiliary analysis result.
Preferably, the method further comprises a step S0 of constructing a relation topological graph of the power distribution network equipment.
Preferably, in step S1, a traveling wave fault location method is used to locate the position of the fault point.
Preferably, the specific step of step S2 is:
step S21, mapping the positioned fault point position to a relation topological graph of the power distribution network equipment;
step S22, starting from the position of the fault point to two sides, and searching at least two relay protection devices with the closest distance;
and step S23, obtaining the fixed value data of the relay protection equipment and recording the fixed value data as the current-level fixed value data.
Preferably, the specific step of step S3 is:
s31, searching a local system to which the position of a fault point on the relation topological graph of the power distribution network equipment belongs;
step S32, traversing the system to which all routes in the relation topological graph of the power distribution network equipment belong;
step S33, acquiring an upper system and a lower system matched with the current system;
and step S34, acquiring the fixed value data of the relay protection equipment in the superior system and the subordinate system corresponding to the relay protection equipment around the fault point position of the current system, and recording the fixed value data as the superior fixed value data and the subordinate fixed value data.
Preferably, in the step S0, when the power distribution network device relationship topological graph is constructed, the fixed value data of each relay protection device included in the power distribution network device relationship topological graph is recorded to form standard fixed value data, and the difference threshold value is calculated according to the fixed value data of the relay protection devices of the same type between the upper-level system and the lower-level system that are matched with each other.
Preferably, the auxiliary analysis result of step S5 includes a fixed value exception, a fixed value mismatch and a mismatch override.
Preferably, when the comparison result between the current-stage fixed value data and the stored standard fixed value data in step S4 is significantly different, the auxiliary analysis result is that the fixed value is abnormal.
Preferably, when the difference between the upper difference value and the lower difference value of step S4 and the comparison result of the preset difference threshold is relatively large, the auxiliary analysis result is that the constant value is not matched properly or the matching is not matched beyond the limit.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an intelligent protection operation fault auxiliary analysis method for a power distribution network, which comprises the steps of extracting relay protection equipment around a fault point position after the fault point position is obtained, obtaining the current-level fixed value data of the relay protection equipment, extracting the fixed value data of the corresponding relay protection equipment in a system with the fault point position, comparing the current-level fixed value data with standard fixed value data, comparing the fixed value difference value and the difference threshold value of the current-level system with the fixed value difference value of the current-level system, and performing fault auxiliary analysis according to the comparison result, so that a worker can be assisted in judging the type of a fault.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a flowchart of an auxiliary analysis method for an intelligent protection operation fault of a power distribution network according to the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described with reference to the accompanying drawings.
Referring to fig. 1, the intelligent protection operation fault auxiliary analysis method for the power distribution network provided by the invention comprises the following steps:
step S1, positioning the fault point position when the fault occurs;
step S2, extracting relay protection equipment around the position of a fault point, acquiring fixed value data of the relay protection equipment, and recording the fixed value data as the current-level fixed value data;
step S3, obtaining the fixed value data of the relay protection equipment at the corresponding positions of the upper and lower levels of the system where the fault point position is located, and recording the fixed value data as the upper fixed value data and the lower fixed value data;
step S4, comparing the current-level fixed value data with the stored standard fixed value data, obtaining a higher-level difference value according to the current-level fixed value data and the higher-level fixed value data, obtaining a lower-level difference value according to the current-level fixed value data and the lower-level fixed value data, and comparing the higher-level difference value and the lower-level difference value with a preset difference threshold value respectively;
and step S5, performing fault auxiliary analysis according to the comparison result, and obtaining an auxiliary analysis result.
The invention discloses an intelligent protection operation fault auxiliary analysis method for a power distribution network, which is used for carrying out fault auxiliary analysis according to a plurality of groups of fixed value data, when a line of the power distribution network has a fault, firstly positioning a fault point position, then searching relay protection equipment around a system where the fault point position is positioned, recording the fixed value data of the current relay protection equipment as local fixed value data after obtaining the fixed value data of the current relay protection equipment, and correspondingly acquiring the standard fixed value data of the corresponding relay protection equipment, wherein the local fixed value data is compared with the standard fixed value data, and when the comparison result is larger in difference, an auxiliary analysis result can be correspondingly obtained according to the comparison result.
In order to fully consider various fault types, the invention also extracts and analyzes the relay protection equipment of the superior and inferior systems of the system where the fault point position is located, extracts the fixed value data of the relay protection equipment corresponding to the superior and inferior systems matched with the system where the fault point position is located, and respectively records the extracted fixed value data as superior fixed value data and inferior fixed value data, the difference value between the superior fixed value data and the current fixed value data of the same relay protection equipment is a superior difference value, the difference value between the inferior fixed value data and the current fixed value data of the same relay protection equipment is a inferior difference value, and the relay protection equipment fixed value data of the whole power distribution network has a standard value, so that a standard difference threshold value exists between the relay protection equipment of the superior and inferior systems matched with each other, and the superior difference value and the inferior difference value are respectively compared with the standard difference threshold value, and obtaining an auxiliary analysis result correspondingly according to the comparison result.
Preferably, the method further comprises a step S0 of constructing a power distribution network device relationship topological graph, recording the fixed value data of each relay protection device contained in the power distribution network device relationship topological graph to form standard fixed value data, and calculating to obtain a difference threshold according to the fixed value data of the relay protection devices of the same type between the upper-level system and the lower-level system which are matched with each other.
Before the fault point position is located, a power distribution network equipment relation topological graph needs to be constructed firstly, wherein the specific position between the main stations, the line connection trend, the length and the like between the main stations and the substation are collected, relay protection equipment is arranged on a line, collected data are converted into the power distribution network equipment relation topological graph, the power distribution network equipment relation topological graph contains the matching relation between an upper system and a lower system, and set fixed value data are correspondingly collected when the relay protection equipment is collected, so that standard fixed value data are formed, and a standard difference threshold value can be obtained through calculation according to the standard fixed value data.
Preferably, in step S1, the fault point position is located by using a traveling wave fault locating method.
The fault point position can be rapidly and accurately obtained by adopting a traveling wave fault positioning method.
Preferably, the specific step of step S2 is:
step S21, mapping the positioned fault point position to a relation topological graph of the power distribution network equipment;
step S22, starting from the position of the fault point to two sides, and searching at least two relay protection devices with the closest distance;
and step S23, obtaining the fixed value data of the relay protection equipment and recording the fixed value data as the current-level fixed value data.
After a power distribution network equipment relation topological graph is constructed, the positioned fault point positions are mapped to the topological graph, then relay protection equipment is searched from the fault point positions to two sides, in order to guarantee the accuracy of fault analysis, at least two relay protection equipment closest to the fault point positions are selected as fault auxiliary analysis equipment, and then the current fixed value of the relay protection equipment is obtained and used as the fixed value data of the current level.
Preferably, the specific step of step S3 is:
s31, searching a local system to which the fault point position on the relation topological graph of the power distribution network equipment belongs;
step S32, traversing the system to which all routes in the relation topological graph of the power distribution network equipment belong;
step S33, acquiring an upper system and a lower system matched with the current system;
and step S34, obtaining the fixed value data of the relay protection equipment corresponding to the relay protection equipment around the fault point position of the system in the superior system and the subordinate system, and recording the fixed value data as the superior fixed value data and the subordinate fixed value data.
After acquiring the position of a fault point and the current-stage constant value data of the relay protection equipment near the position of the fault point, traversing the system to which the adjacent line belongs from the power distribution network relation topological graph, searching the superior and subordinate systems matched with the system at the position of the fault point, simultaneously finding the corresponding relay protection equipment in the superior and subordinate systems according to the relay protection equipment searched by the current stage, acquiring the constant value data of the relay protection equipment, and recording the constant value data as the superior constant value data and the subordinate constant value data respectively.
Preferably, the auxiliary analysis result of step S5 includes abnormal fixed value, improper fixed value matching, and out-of-limit matching, and when the comparison result between the current-level fixed value data and the stored standard fixed value data is relatively large, the auxiliary analysis result is abnormal fixed value; and when the difference between the upper-level difference value and the lower-level difference value is larger than the comparison result of the preset difference threshold value, the auxiliary analysis result is that the fixed value is not matched properly or the matching is out of range.
The auxiliary analysis results of the faults comprise various types, when the current-level fixed value data is not matched with the stored standard fixed value data, the fixed value of the relay protection equipment is proved to be abnormal, when the upper-level difference value or the lower-level difference value is not matched with the difference threshold value, the matching between the current level and the upper level or the lower level is proved to be in problem, the corresponding auxiliary analysis result is that the fixed value is not matched properly or the matching exceeds the limit, and a worker can adopt a corresponding strategy according to the corresponding auxiliary analysis result.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (9)
1. An intelligent protection operation fault auxiliary analysis method for a power distribution network is characterized by comprising the following steps:
step S1, positioning the fault point position when the fault occurs;
step S2, extracting relay protection equipment around the position of a fault point, acquiring fixed value data of the relay protection equipment, and recording the fixed value data as the current-level fixed value data;
step S3, acquiring the fixed value data of the relay protection equipment at the corresponding positions of the upper and lower stages of the system where the fault point position is located, and recording the fixed value data as the upper stage fixed value data and the lower stage fixed value data;
step S4, comparing the current-level fixed value data with the stored standard fixed value data, obtaining a previous-level difference value according to the current-level fixed value data and the previous-level fixed value data, obtaining a next-level difference value according to the current-level fixed value data and the next-level fixed value data, and comparing the previous-level difference value and the next-level difference value with preset difference threshold values respectively;
and step S5, performing fault auxiliary analysis according to the comparison result, and obtaining an auxiliary analysis result.
2. The intelligent protection operation fault auxiliary analysis method for the power distribution network according to claim 1, characterized by further comprising the step of S0, constructing a power distribution network equipment relation topological graph.
3. The intelligent protection operation fault auxiliary analysis method for the power distribution network according to claim 1, wherein in the step S1, a traveling wave fault location method is used to locate the position of the fault point.
4. The intelligent protection operation fault auxiliary analysis method for the power distribution network according to claim 2, wherein the specific steps of the step S2 are as follows:
step S21, mapping the positioned fault point position to a power distribution network equipment relation topological graph;
step S22, starting from the position of the fault point to two sides, and searching at least two relay protection devices with the closest distance;
and step S23, obtaining the fixed value data of the relay protection equipment and recording the fixed value data as the current-level fixed value data.
5. The method for auxiliary analysis of the intelligent protection operation fault of the power distribution network according to claim 4, wherein the specific steps of the step S3 are as follows:
s31, searching a local system to which the fault point position on the relation topological graph of the power distribution network equipment belongs;
step S32, traversing the system to which all routes in the relation topological graph of the power distribution network equipment belong;
step S33, acquiring an upper system and a lower system matched with the current system;
and step S34, obtaining the fixed value data of the relay protection equipment corresponding to the relay protection equipment around the fault point position of the system in the superior system and the subordinate system, and recording the fixed value data as the superior fixed value data and the subordinate fixed value data.
6. The intelligent protection operation fault auxiliary analysis method for the power distribution network according to claim 2, wherein in the step S0, when the power distribution network equipment relation topological graph is constructed, the fixed value data of each relay protection equipment included in the power distribution network equipment relation topological graph is recorded to form standard fixed value data, and the difference threshold value is calculated according to the fixed value data of the relay protection equipment of the same type between the upper-level system and the lower-level system which are matched with each other.
7. The intelligent protection operation fault auxiliary analysis method for the power distribution network according to claim 1, wherein the auxiliary analysis result of the step S5 includes abnormal fixed value, improper fixed value matching and out-of-limit matching.
8. The method according to claim 7, wherein when a comparison result between the current-stage fixed value data of step S4 and the stored standard fixed value data is relatively different, the auxiliary analysis result is that the fixed value is abnormal.
9. The method according to claim 7, wherein when the difference between the upper difference value and the lower difference value of step S4 and the comparison result of the preset difference threshold is relatively large, the auxiliary analysis result is that the constant value is not matched properly or the matching is out of limit.
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