CN111123027A - Multi-end transmission line fault location method based on WAMS system - Google Patents
Multi-end transmission line fault location method based on WAMS system Download PDFInfo
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- CN111123027A CN111123027A CN201911102153.6A CN201911102153A CN111123027A CN 111123027 A CN111123027 A CN 111123027A CN 201911102153 A CN201911102153 A CN 201911102153A CN 111123027 A CN111123027 A CN 111123027A
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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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 belongs to the field of power systems, and relates to a multi-end transmission line fault location method based on a WAMS system. The invention comprises the following steps: a fault distance calculation method based on single-ended PMU measurement data; a method for determining a main network fault node of a double-end power transmission network; a method for calculating the fault distance of the branch line of the double-end power transmission network; and judging the position of the fault point. The invention utilizes the data measured by the WAMS system to calculate the fault position on the main network, and further completes accurate fault positioning by synthesizing multi-terminal data on the basis. According to the invention, not only can the fault accurate ranging of the double-end trunk line be realized, but also the fault accurate ranging of the multi-end branch line can be realized according to the data of the WAMS system, the global analysis of the multi-end line is realized through pairwise pairing of the multi-end line, the line connection topology is assisted, and the system monitoring range is expanded through the cyclic iteration. The fault location of the multi-end transmission line based on the WAMS system has higher accuracy and reliability.
Description
Technical Field
The invention relates to the field of power systems, in particular to a multi-end transmission line fault location method based on a WAMS system.
Background
After the power transmission line of the power system has a fault, the position of the fault point is timely and accurately determined, the fault point is rapidly found out for maintenance or accident first-aid repair, and the utilization rate and the safety reliability of a power grid can be improved.
The research on the fault location method of the power transmission line at home and abroad has been carried out for decades, and a large number of fault location principles and methods are provided. These methods can be generally classified into: single-ended and double-ended ranging algorithms. The single-ended distance measurement algorithm has insufficient information quantity, the distance measurement precision is always influenced by the system operation mode and the transition resistance, and the result is not ideal; and the double-end ranging algorithm makes full use of fault information, so that high ranging accuracy can be obtained.
The rapid and accurate fault location of the power transmission line has important significance for rapidly clearing faults and recovering the operation of the line. With the large number of Phasor Measurement Units (PMUs) configured in an electric power System, a Wide Area Measurement System (WAMS) based on the PMUs is gradually formed, and accurate fault location is possible by using synchronized phasors at two ends of a line or the WAMS System. The fault location algorithm based on the line multi-end PMU measurement result has the advantages of strong self-adaptive capacity, high precision and small algorithm calculation amount.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a fault location method for a multi-end transmission line based on a WAMS system. The method aims to solve the problem that when a transmission line breaks down, the transmission grid can be quickly and accurately positioned so as to improve the safety and reliability of the power grid.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method for measuring the fault distance of the multi-end transmission line based on the WAMS system comprises the following steps:
step 1: a fault distance calculation method based on single-ended PMU measurement data; when the system has single-phase earth fault, the vector is used
And
by solving equilibrium equations
Obtaining the fault distance, wherein D is the fault distance and is in kilometers; the fault occurs in the main network and is marked as N ═ D, wherein
For fault current, RfTo transition resistance, ZaaImpedance per kilometer unit of three-phase line; fault current estimation
By
Is obtained in which
Phase current before a fault;
step 2: a method for determining a main network fault node of a double-end power transmission network; the double-end network is powered by equivalent power supplies G and H, the distance H is (1-m) unit if the distance G between fault points is m unit, and the balance equation is solved
Obtaining the fault distance M, multiplying the total distance of the main wiring by the M to obtain the actual fault distance M,
in order to be the voltage of the fault point,
for the terminal voltage of the power supply G,
for the terminal voltage of the power supply H,
is the current of the power supply G,
is the current of the power supply H, and Z is the impedance of the power transmission line;
and step 3: a method for calculating the fault distance of the branch line of the double-end power transmission network; when in the line L1When the fault occurs, the main network is equivalent to a measuring point; the multi-end transmission line is equivalent to an equivalent circuit in the step 1, a balance equation is written by the method in the step 1, and the fault distance D is solved;
and 4, step 4: judging the position of a fault point; judging the threshold relation between the fault distance N, M and D obtained in the previous three steps to obtain the position of a fault point; the judging method comprises the following steps: if M is equal to N, the fault is in the main line, and the fault distance is given as M and is in kilometers; if M is not equal to N, the fault is in the branch lines of the power transmission lines at the two ends, the fault distance is M + D, and the unit is kilometer; and correcting the fault distance according to the PMU measurement data of the branch lines of the power transmission lines at the two ends.
The invention utilizes the data measured by the WAMS system to calculate the fault position on the main network, and further completes accurate fault positioning by synthesizing multi-terminal data on the basis. Compared with the existing power transmission line fault positioning algorithm, the method can realize accurate fault location of the double-end trunk line and the multi-end branch line according to the data of the WAMS, pairwise pairing of the multi-end lines is realized, line connection topology is assisted, global analysis of the multi-end lines is realized through cyclic iteration, and the system monitoring range is expanded. The fault location of the multi-end transmission line based on the WAMS system has higher accuracy and reliability.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
FIG. 1 is a flow chart of the fault location of the present invention;
FIG. 2 shows the phase A of the present invention having a single-phase earth fault;
FIG. 3 is a diagram of the present invention where the fault occurs m units from the G node;
fig. 4 is a multi-terminal transmission line of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
The invention provides a fault location method for a multi-end transmission line based on a WAMS system, which carries out fault location on a main network and a branch line of a transmission line based on normal operation data and fault data measured by the WAMS system, and comprises the following steps:
(1) fault distance calculation method based on single-ended PMU measurement data
FIG. 2 shows that the system has single-phase earth fault, known phasor
According to ohm's law, there is a relation
Wherein D is the fault distance (in kilometers),
for fault current, RfTo transition resistance, ZaaImpedance per kilometer unit for a three-phase line. For a line with length L, the fault distance D can be calculated using the following method: first, the fault current estimation value
Can be expressed as
Wherein the content of the first and second substances,
phase current before a fault; then, solving the solution containing D and RfEquation of equilibrium for unknowns
Formula (II)
The method comprises the following steps of (1) containing two real equations of a real part and an imaginary part, wherein the equations can be solved; finally, according to the fault distance, calculating the voltage phasor of the fault point
In the algorithm, the fault distance in the main network is represented by N, where N is D and unit kilometer.
(2) Method for determining main network fault node of double-end power transmission network
The main network of the looped network and the double-end transmission network can be equivalent to a double-end network shown in figure 3. The two-terminal network shown in fig. 3 can be supplied by equivalent power sources G and H, and when a fault occurs at point F, the fault point F is at a distance G of m units, and the distance H is at (1-m) units, and the balance equation is satisfied:
in the formula (I), the compound is shown in the specification,
in order to be the voltage of the fault point,
for the terminal voltage of the power supply G,
for the terminal voltage of the power supply H,
is the current of the power supply G,
is the current of the power supply H and Z is the impedance of the transmission line. Two areSubtracting the formula to obtain
Solution formula
The fault distance m can be obtained; then, the actual distance M is obtained by multiplying M by the total distance of the main wirings.
(3) Method for calculating fault distance of branch line of double-end power transmission network
As shown in fig. 4, the step of calculating the fault distance of the branch line is the same as the method in the first step, but the difference is that the distance is the actual distance of the branch from the main network bus to the fault point.
As shown in fig. 4, i.e. when on line L1When a fault occurs, the main network can be equivalent to a measuring point, namely, the multi-end transmission line is equivalent to an equivalent circuit in the first step, a balance equation is written by the method in the first step, and P is solved1Point to L1And recording the distance of the upper fault point as D, wherein the unit of the distance is kilometer.
(4) Location determination of a fault point
The position of the fault point can be judged by judging the threshold value relation between the fault distance N, M and D obtained in the previous three steps, and the method comprises the following steps: if M ═ N, then the fault is in the main line, and the fault distance may be given as M (km); if M ≠ N, the fault is in the branch line, and the fault distance is (M + D) km. Judging whether the branch line is provided with a PMU or not, and if so, performing correction by using the step (2); otherwise, calculating the next line fault.
The results of the above four steps are combined, and the flow chart of the method is shown in figure 1.
Figure 1 pictorially shows a method for measuring the fault of the multi-end transmission line based on the WAMS system.
Firstly, obtaining fault data and normal data required by fault location through a WAMS system; then, calculating the distance N between the fault point and the end point on the equivalent network according to the data; then calculating the distance M between the equivalent fault point and the end point on the main network and the fault voltage and current data at the equivalent main network fault point; and equating the branch line to be a circuit in the first step through the WAMS system data and the equivalent main network fault point data obtained before, and solving the distance D from the branch fault point to the equivalent main network fault point. Finally, the fault point position is judged through the threshold value relation between N, M and D, and the method comprises the following steps: if M is equal to N, the fault is in the main line, and the fault distance can be given as M; if M ≠ N, the fault is in the branch line, and the fault distance is M + D. Judging whether the branch line is provided with a PMU or not, and if so, performing ranging correction by using the step (2); otherwise, calculating the next line fault.
Exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various changes and modifications may be made to the specific embodiments described above and various combinations of the various features and structures proposed by the present invention may be made without departing from the concept of the present invention, the scope of which is defined by the appended claims.
Claims (1)
1. The method for measuring the fault distance of the multi-end transmission line based on the WAMS system is characterized by comprising the following steps of:
step 1: a fault distance calculation method based on single-ended PMU measurement data; when the system has single-phase earth fault, the vector is used
And
by solving equilibrium equations
Obtaining the fault distance, wherein D is the fault distance and is in kilometers; the fault occurs in the main network and is marked as N ═ D, wherein
For fault current, RfTo transition resistance, ZaaImpedance per kilometer unit of three-phase line; fault current estimation
By
Is obtained in which
Phase current before a fault;
step 2: a method for determining a main network fault node of a double-end power transmission network; the double-end network is powered by equivalent power supplies G and H, the distance H is (1-m) unit if the distance G between fault points is m unit, and the balance equation is solved
And
obtaining the fault distance M, multiplying the total distance of the main wiring by the M to obtain the actual fault distance M,
in order to be the voltage of the fault point,
for the terminal voltage of the power supply G,
for the terminal voltage of the power supply H,
is the current of the power supply G,
is the current of the power supply H, and Z is the impedance of the power transmission line;
and step 3: a method for calculating the fault distance of the branch line of the double-end power transmission network; when in the line L1When the fault occurs, the main network is equivalent to a measuring point; the multi-end transmission line is equivalent to an equivalent circuit in the step 1, a balance equation is written by the method in the step 1, and the fault distance D is solved;
and 4, step 4: judging the position of a fault point; judging the threshold relation between the fault distance N, M and D obtained in the previous three steps to obtain the position of a fault point; the judging method comprises the following steps: if M is equal to N, the fault is in the main line, and the fault distance is given as M and is in kilometers; if M is not equal to N, the fault is in the branch lines of the power transmission lines at the two ends, the fault distance is M + D, and the unit is kilometer; and correcting the fault distance according to the PMU measurement data of the branch lines of the power transmission lines at the two ends.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650469A (en) * | 2020-05-14 | 2020-09-11 | 南方电网科学研究院有限责任公司 | D-PMU device-based power distribution network fault accurate positioning method |
| CN112162176A (en) * | 2020-09-30 | 2021-01-01 | 国网河南省电力公司洛阳供电公司 | Power distribution network interphase short circuit fault positioning method based on mu PMU measurement data |
| CN112198395A (en) * | 2020-09-29 | 2021-01-08 | 国网河南省电力公司洛阳供电公司 | Synchronous data fault positioning system for power distribution network |
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2019
- 2019-11-12 CN CN201911102153.6A patent/CN111123027A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650469A (en) * | 2020-05-14 | 2020-09-11 | 南方电网科学研究院有限责任公司 | D-PMU device-based power distribution network fault accurate positioning method |
| CN111650469B (en) * | 2020-05-14 | 2021-11-16 | 南方电网科学研究院有限责任公司 | D-PMU device-based power distribution network fault accurate positioning method |
| CN112198395A (en) * | 2020-09-29 | 2021-01-08 | 国网河南省电力公司洛阳供电公司 | Synchronous data fault positioning system for power distribution network |
| CN112162176A (en) * | 2020-09-30 | 2021-01-01 | 国网河南省电力公司洛阳供电公司 | Power distribution network interphase short circuit fault positioning method based on mu PMU measurement data |
| CN112162176B (en) * | 2020-09-30 | 2022-04-22 | 国网河南省电力公司洛阳供电公司 | Power distribution network interphase short circuit fault positioning method based on mu PMU measurement data |
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