CN114384376A - Fault classification positioning method for direct-current power distribution network - Google Patents
Fault classification positioning method for direct-current power distribution network Download PDFInfo
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- CN114384376A CN114384376A CN202210285408.2A CN202210285408A CN114384376A CN 114384376 A CN114384376 A CN 114384376A CN 202210285408 A CN202210285408 A CN 202210285408A CN 114384376 A CN114384376 A CN 114384376A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- 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 a fault classification positioning method for a direct current power distribution network, which comprises the following steps: step S1, firstly, dividing the direct current distribution network into a plurality of distribution intervals through direct current breakers; step S2, independently detecting a plurality of power distribution intervals of the direct current power distribution network through a fault detector; step S3, when the direct current distribution network has a fault, the fault detector is used for positioning the power distribution interval with the fault, the direct current breaker is used for separating the power distribution interval with the fault, and other power distribution intervals without the fault are started; step S4, determining the fault type according to the fault detector, and obtaining the fault generation factor through the fault database; and step S5, processing the fault position according to the fault generation factor and the fault impedance distance calculation method, and judging the fault position of the line by synthesizing factors in and outside the line so as to solve the problem that the fault positioning of the existing direct current power distribution network is not accurate enough.
Description
Technical Field
The invention relates to the technical field of fault detection, in particular to a fault classification and positioning method for a direct-current power distribution network.
Background
Compared with an alternating-current distribution network, the direct-current distribution network provides a direct-current bus for loads, the direct-current loads can be directly supplied with power by the direct-current bus, the alternating-current loads need to be supplied with power after passing through inverter equipment, and if the proportion of the direct-current loads in the loads is large, the direct-current distribution network has great advantages. The direct-current distribution network has small line loss, high reliability, no need of phase-frequency control and strong distributed power supply accepting capability.
In the prior art, in the process of monitoring faults of a power distribution network, the fault position is usually determined by adopting an impedance method to perform current feedback on the power distribution network, but the mode of determining the fault point through feedback is simpler, particularly, a buried direct-current power distribution network is influenced by a plurality of stratum factors or external force factors in the process of checking the specific fault point, if the direct-current power distribution network is the same as an alternating-current power distribution network, cables are mostly laid in a direct-buried manner, and most faults are municipal construction or absolute fault construction
Due to short-circuit faults caused by aging and the like, the existing fault positioning method is not accurate enough in positioning.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a direct current power distribution network fault classification positioning method which can judge the fault position of a line by integrating factors in the line and factors outside the line so as to solve the problem that the fault positioning of the existing direct current power distribution network is not accurate enough.
In order to achieve the purpose, the invention is realized by the following technical scheme: a fault classification positioning method for a direct current power distribution network comprises the following steps:
step S1, firstly, dividing the direct current distribution network into a plurality of distribution intervals through direct current breakers;
step S2, independently detecting a plurality of power distribution intervals of the direct current power distribution network through a fault detector;
step S3, when the direct current distribution network has a fault, the fault detector is used for positioning the power distribution interval with the fault, the direct current breaker is used for separating the power distribution interval with the fault, and other power distribution intervals without the fault are started;
step S4, determining the fault type according to the fault detector, and obtaining the fault generation factor through the fault database;
and step S5, processing according to the fault generation factor and the fault impedance distance calculation method to obtain the fault position.
Further, the step S4 further includes the following steps:
step A1, setting the fault types of the direct current distribution network as a single-pole grounding fault and an inter-pole short-circuit fault;
step A2, acquiring fault generating factors in a fault database, wherein the fault generating factors of the single-pole ground fault comprise ground insulation layer damage, and the fault generating factors of the inter-pole short circuit fault comprise line insulation aging fault and construction disconnection fault.
Further, the step S4 further includes the following steps:
a3, obtaining line quality information of the direct current power distribution network from a fault database, wherein the line quality information comprises the corrosion degree of a buried line region, the line diameter and the service life of an insulating layer;
acquiring the position of a daily line construction point from a municipal database;
and A4, sequencing the corrosion degrees of the buried wire regions from high to low, sequencing the wire diameters of the wires from low to high, and sequencing the service lives of the insulating layers of the wires from low to high.
Further, the step S5 further includes the following steps:
step B1, when the fault position of the single-pole earth fault is positioned, according to the corrosion degree of the buried wire area, the inspection is carried out by combining the wire diameter and the service life of the insulating layer;
and step B2, when the fault position of the inter-electrode short circuit fault is positioned, according to the distance detection point position of the daily line construction point, and by combining the service life of the insulating layer, the line diameter and the corrosion degree of the buried line region, checking.
Further, the step S5 further includes the following steps:
step S50, a capacitor with the same voltage as that of the power distribution section before the fault occurs is sent from the detection point to the power distribution section with the fault, then Fourier transform is carried out on the discharge current to obtain the characteristic frequency of the fault loop, then numerical fitting is carried out to obtain an attenuation coefficient, and finally the fault distance is determined;
and the fault distance is the distance from the fault point to the detection point.
Further, the step B1 further includes a step B10, and the step B10 includes: substituting the corrosion degree and the wire diameter of a buried wire region corresponding to the line and the service life of an insulating layer into a line grounding risk formula to obtain a line grounding fault risk value;
substituting the earth fault risk value, the distance between the middle section of the line and the detection point and the fault distance into a unipolar fault troubleshooting formula to obtain a unipolar fault troubleshooting value;
and (4) checking the line from high to low according to the unipolar fault checking value.
Further, the line grounding risk formula is configured to:
(ii) a Wherein Pjd is a ground fault risk value, Dfs is buried wire region corrosion degree, Rx is a wire diameter, Yjs is an insulation service life, d1 is a corrosion degree unipolar fault conversion coefficient, r1 is a wire diameter unipolar fault conversion coefficient, and the unipolar fault troubleshooting formula is configured as follows:
(ii) a The Pdgp is a single-pole troubleshooting value, Sgz is a fault distance, and Szd is a distance from the middle section of the line to a detection point.
Further, the step B2 further includes a step B20, and the step B20 includes: substituting the daily line construction point distance detection point position, the service life of the insulating layer, the line diameter, the corrosion degree of the buried line region and the fault distance corresponding to the line into an interelectrode troubleshooting formula to obtain an interelectrode troubleshooting value;
and (4) checking the line from high to low according to the inter-electrode fault checking value.
Further, the inter-electrode troubleshooting formula is configured to:
(ii) a Wherein Pjjp is the inter-electrode troubleshooting value, and Ssj is corresponding to the lineThe distance between the construction point and the detection point of the daily line, the d2 corrosion degree inter-electrode fault conversion coefficient and r2 are line diameter inter-electrode fault conversion coefficients.
The invention has the beneficial effects that: according to the invention, the direct-current power distribution network is divided into a plurality of power distribution intervals through the direct-current circuit breakers, the plurality of power distribution intervals of the direct-current power distribution network are independently detected through the fault detector, and the complexity of a fault detection process can be reduced and the fault screening efficiency can be improved by setting the plurality of power distribution intervals.
When the direct-current power distribution network fails, the fault detection instrument is used for positioning the power distribution section with the fault, the power distribution section with the fault is separated through the direct-current circuit breaker, and other power distribution sections without the fault are opened, so that the power distribution safety of other normal power distribution sections can be guaranteed when the power distribution network fails.
According to the method, the fault type is determined according to the fault detector, the fault generation factor is obtained through the fault database, the fault position is obtained through processing according to the fault generation factor and the fault impedance distance calculation method, and the screening accuracy of the fault point of the line can be improved through the combination of the feedback point inside the line and the environmental factor outside the line.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a flow chart of sub-steps of step S4 of the present invention;
fig. 3 is a flowchart illustrating the sub-steps of step S5 according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1, a method for classifying and positioning faults of a dc power distribution network includes the following steps:
step S1, firstly, dividing the direct current distribution network into a plurality of distribution intervals through direct current breakers; through dividing whole distribution network into a plurality of distribution intervals, can realize the power supply independence between every distribution interval to when one of them distribution interval breaks down, guarantee the distribution security between other distribution intervals.
Step S2, independently detecting a plurality of power distribution intervals of the direct current power distribution network through a fault detector; meanwhile, after the whole power distribution network is divided, the efficiency of fault point screening can be improved, and therefore the speed of fault location is increased.
Step S3, when the direct current distribution network has a fault, the fault detector is used for positioning the power distribution interval with the fault, the direct current breaker is used for separating the power distribution interval with the fault, and other power distribution intervals without the fault are started; the fault intervals can be separated independently through the direct-current circuit breaker, and therefore the normal power distribution state of other normally-operated intervals of the whole direct-current power distribution network is guaranteed.
Step S4, determining the fault type according to the fault detector, and obtaining the fault generation factor through the fault database;
referring to fig. 2, the step S4 further includes the following steps:
step A1, setting the fault types of the direct current distribution network as a single-pole grounding fault and an inter-pole short-circuit fault; under normal conditions, the fault types of the direct current distribution network are single-pole grounding fault and interelectrode short-circuit fault.
Step A2, acquiring fault generating factors in a fault database, wherein the fault generating factors of the single-pole ground fault comprise ground insulation layer damage, and the fault generating factors of the inter-pole short circuit fault comprise line insulation aging fault and construction disconnection fault; the normal causes of failure are line aging and construction break line failure or insulation layer aging.
A3, obtaining line quality information of the direct current power distribution network from a fault database, wherein the line quality information comprises the corrosion degree of a buried line region, the line diameter and the service life of an insulating layer; acquiring the position of a daily line construction point from a municipal database; the corrosion degree of the buried line area is set according to the geological pH value of the area, and the service life of the insulating layer is set according to the service quality of the line.
Step A4, sequencing the corrosion degree of the buried line region from high to low, wherein the higher the corrosion degree of the buried line region is, the stronger the corrosion of the geology of the region to the line is, thereby indicating that the higher the possibility of the line of the region breaking down is, sequencing the line diameters of the line from low to high, the thicker the line diameter of the line is, the better the quality of the line is, the lower the possibility of the breaking down is, sequencing the service life of the insulating layer of the line from low to high, the higher the service life of the insulating layer of the line is, the better the protection effect of the line is, and the lower the possibility of the line breaking down is.
And step S5, processing according to the fault generation factor and the fault impedance distance calculation method to obtain the fault position. Referring to fig. 3, the step S5 further includes the following steps: step B1, when the fault position of the single-pole earth fault is positioned, according to the corrosion degree of the buried wire area, the inspection is carried out by combining the wire diameter and the service life of the insulating layer; the step B1 further includes a step B10, the step B10 includes: substituting the corrosion degree and the wire diameter of a buried wire region corresponding to the line and the service life of an insulating layer into a line grounding risk formula to obtain a line grounding fault risk value; substituting the earth fault risk value, the distance between the middle section of the line and the detection point and the fault distance into a unipolar fault troubleshooting formula to obtain a unipolar fault troubleshooting value; and (4) checking the line from high to low according to the unipolar fault checking value.
The line grounding risk formula is configured to:
(ii) a Pjd is a ground fault risk value, Dfs is buried line regional corrosion degree, Rx is a line diameter, Yjs is insulating layer service life, d1 is a corrosion degree unipolar fault conversion coefficient, d1 is used for setting the proportion occupied between the corrosion degree and the unipolar fault, r1 is a line diameter unipolar fault conversion coefficient, r1 is used for setting the proportion occupied between the line diameter and the unipolar fault, the unipolar fault troubleshooting formula is configured as follows:
(ii) a The Pdgp is a single-pole troubleshooting value, Sgz is a fault distance, and Szd is a distance from the middle section of the line to a detection point.
And step B2, when the fault position of the inter-electrode short circuit fault is positioned, according to the distance detection point position of the daily line construction point, and by combining the service life of the insulating layer, the line diameter and the corrosion degree of the buried line region, checking. The step B2 further includes a step B20, the step B20 includes: substituting the daily line construction point distance detection point position, the service life of the insulating layer, the line diameter, the corrosion degree of the buried line region and the fault distance corresponding to the line into an interelectrode troubleshooting formula to obtain an interelectrode troubleshooting value; and (4) checking the line from high to low according to the inter-electrode fault checking value.
The interpolar troubleshooting formula is configured as:
(ii) a Wherein Pjjp is an inter-electrode fault troubleshooting value, Ssj is a daily line construction point distance detection point position corresponding to a line, d2 corrosion degree inter-electrode fault conversion coefficient, d2 is used for setting the proportion of the corrosion degree to the inter-electrode fault, r2 is a wire diameter inter-electrode fault conversion coefficient, and r2 is used for setting the proportion of the wire diameter to the inter-electrode fault.
The step S5 further includes the steps of: step S50, a capacitor with the same voltage as that of the power distribution section before the fault occurs is sent from the detection point to the power distribution section with the fault, then Fourier transform is carried out on the discharge current to obtain the characteristic frequency of the fault loop, then numerical fitting is carried out to obtain an attenuation coefficient, and finally the fault distance is determined; and the fault distance is the distance from the fault point to the detection point. In step S50, the adopted fault point detection method belongs to the existing current detection method, and the position of the fault point is obtained by the deviation between the signal of the fault after the discharging current reaches the fault point and the original normal distribution network signal and then processing the feedback information, and the fault distance calculated in step S50 and the reference data of other fault factors in the line are comprehensively processed, so that the position of the fault point can be further determined, and the efficiency of fault location is improved.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A fault classification positioning method for a direct current power distribution network is characterized by comprising the following steps:
step S1, firstly, dividing the direct current distribution network into a plurality of distribution intervals through direct current breakers;
step S2, independently detecting a plurality of power distribution intervals of the direct current power distribution network through a fault detector;
step S3, when the direct current distribution network has a fault, the fault detector is used for positioning the power distribution interval with the fault, the direct current breaker is used for separating the power distribution interval with the fault, and other power distribution intervals without the fault are started;
step S4, determining the fault type according to the fault detector, and obtaining the fault generation factor through the fault database;
and step S5, processing according to the fault generation factor and the fault impedance distance calculation method to obtain the fault position.
2. The method for classifying and positioning the faults of the direct current distribution network according to claim 1, wherein the step S4 further comprises the steps of:
step A1, setting the fault types of the direct current distribution network as a single-pole grounding fault and an inter-pole short-circuit fault;
step A2, acquiring fault generating factors in a fault database, wherein the fault generating factors of the single-pole ground fault comprise ground insulation layer damage, and the fault generating factors of the inter-pole short circuit fault comprise line insulation aging fault and construction disconnection fault.
3. The method for classifying and positioning the faults of the direct current distribution network according to claim 2, wherein the step S4 further comprises the steps of:
a3, obtaining line quality information of the direct current power distribution network from a fault database, wherein the line quality information comprises the corrosion degree of a buried line region, the line diameter and the service life of an insulating layer;
acquiring the position of a daily line construction point from a municipal database;
and A4, sequencing the corrosion degrees of the buried wire regions from high to low, sequencing the wire diameters of the wires from low to high, and sequencing the service lives of the insulating layers of the wires from low to high.
4. The method for classifying and positioning the faults of the direct current distribution network according to claim 3, wherein the step S5 further comprises the following steps:
step B1, when the fault position of the single-pole earth fault is positioned, according to the corrosion degree of the buried wire area, the inspection is carried out by combining the wire diameter and the service life of the insulating layer;
and step B2, when the fault position of the inter-electrode short circuit fault is positioned, according to the distance detection point position of the daily line construction point, and by combining the service life of the insulating layer, the line diameter and the corrosion degree of the buried line region, checking.
5. The method for classifying and positioning the faults of the direct current distribution network according to claim 4, wherein the step S5 further comprises the following steps:
step S50, a capacitor with the same voltage as that of the power distribution section before the fault occurs is sent from the detection point to the power distribution section with the fault, then Fourier transform is carried out on the discharge current to obtain the characteristic frequency of the fault loop, then numerical fitting is carried out to obtain an attenuation coefficient, and finally the fault distance is determined;
and the fault distance is the distance from the fault point to the detection point.
6. The method for fault classification and location of the direct current distribution network according to claim 5, wherein the step B1 further comprises a step B10, and the step B10 comprises: substituting the corrosion degree and the wire diameter of a buried wire region corresponding to the line and the service life of an insulating layer into a line grounding risk formula to obtain a line grounding fault risk value;
substituting the earth fault risk value, the distance between the middle section of the line and the detection point and the fault distance into a unipolar fault troubleshooting formula to obtain a unipolar fault troubleshooting value;
and (4) checking the line from high to low according to the unipolar fault checking value.
7. The method for fault classification and location of the direct current distribution network according to claim 6, wherein the line grounding risk formula is configured to:
(ii) a Wherein Pjd is a ground fault risk value, Dfs is buried wire region corrosion degree, Rx is a wire diameter, Yjs is an insulation service life, d1 is a corrosion degree unipolar fault conversion coefficient, r1 is a wire diameter unipolar fault conversion coefficient, and the unipolar fault troubleshooting formula is configured as follows:
(ii) a The Pdgp is a single-pole troubleshooting value, Sgz is a fault distance, and Szd is a distance from the middle section of the line to a detection point.
8. The method for fault classification and location of the direct current distribution network according to claim 7, wherein the step B2 further comprises a step B20, and the step B20 comprises: substituting the daily line construction point distance detection point position, the service life of the insulating layer, the line diameter, the corrosion degree of the buried line region and the fault distance corresponding to the line into an interelectrode troubleshooting formula to obtain an interelectrode troubleshooting value;
and (4) checking the line from high to low according to the inter-electrode fault checking value.
9. The method for fault classification and location of the direct current distribution network according to claim 8, wherein the inter-electrode troubleshooting formula is configured as follows:
(ii) a Wherein, Pjjp is an interelectrode fault troubleshooting value, Ssj is a daily line construction point distance detection point position corresponding to a line, d2 corrosion degree interelectrode fault conversion coefficient, and r2 is a line diameter interelectrode fault conversion coefficient.
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