CN114137360A - Power distribution network fault positioning method and device and storage medium - Google Patents
Power distribution network fault positioning method and device and storage medium Download PDFInfo
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- 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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- 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
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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 discloses a power distribution network fault positioning method, a device and a storage medium, wherein the method comprises the following steps: acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements; calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element; and carrying out fault location on the fault element, and determining the actual position of the fault. According to the technical scheme, the fault location of the power distribution network can be rapidly and accurately carried out.
Description
Technical Field
The embodiment of the invention relates to the technical field of power distribution networks, in particular to a power distribution network fault positioning method, a power distribution network fault positioning device and a storage medium.
Background
With the development of intelligent power distribution network technology, more and more distributed energy sources are accessed to a power distribution network, and the topology of the power distribution network becomes more and more complex, so that the fault location of the power distribution network is the current hot problem as an important link for connecting power consumers and a transmission network.
The existing power distribution network fault positioning method adopts a matrix method, based on graph theory knowledge, topology description is carried out on a power distribution network by combining topological structure characteristics of the power distribution network to obtain a description matrix of the power distribution network, and then a fault information matrix is generated according to fault information uploaded by a feeder line terminal device, and fault positioning is carried out. However, under the condition that uncertainty exists in distributed energy capacity and control, the fault characteristics and the operating characteristics of the power distribution network become no longer typical, so that a fault indicating unit cannot give a correct fault signal, and fault location is invalid, and the matrix method is difficult to adopt the most original fault characteristic data by adopting a variable of 0-1, and is low in applicability under the condition of new energy access.
Disclosure of Invention
The invention provides a power distribution network fault positioning method, a power distribution network fault positioning device and a storage medium, which are used for quickly and accurately positioning a power distribution network fault.
In a first aspect, an embodiment of the present invention provides a power distribution network fault location method, where the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element;
and carrying out fault location on the fault element, and determining the actual position of the fault.
Optionally, after acquiring the network with the power distribution network fault, the method further includes: carrying out normalization processing on the power distribution network fault network; wherein the fault current at any element of the power distribution network fault network after normalization processing is
Representing the component current injected from one direction,
representing the component current injected from the other direction,
representing the current injected from the element, 0 < alpha < 1.
Optionally, calculating a fault matching value of each element includes: constructing a state estimation equation according to real-time measurement data of a power distribution network fault network and power distribution network wiring topology; calculating an estimation result of the system state characteristic quantity according to a state estimation equation; and calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Optionally, the state estimation equation is z ═ H · x + r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state; estimation result of system state feature quantity
Wherein, R is a variance diagonal matrix of the measurement error; failure match value J ═ x (z-H)TR-1(z-H·x)。
Optionally, performing fault location on the faulty component, and determining an actual location of the fault includes: the actual position of the fault is determined according to (1-alpha) by the magnitude of the component currents injected from two directions measured by the estimation of the system state characteristic quantity.
Optionally, before performing fault location to the faulty component and determining the actual location of the fault, the method further includes: and carrying out fault phase selection according to the fault element.
Optionally, performing fault phase selection according to a fault element, including: constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network; and respectively calculating the sum of the component currents injected from two directions by the A-phase fault network, the B-phase fault network and the C-phase fault network, and performing fault phase selection according to whether the phase has fault current or not.
Optionally, the element is a busbar and/or a segmented line.
In a second aspect, an embodiment of the present invention further provides a power distribution network fault location device, where the device includes:
the information acquisition module is used for acquiring a power distribution network fault network, and the power distribution network fault network comprises a plurality of elements;
the fault element matching module is used for calculating a fault matching value of each element and selecting the element with the minimum fault matching value as a fault element;
and the fault position determining module is used for carrying out fault distance measurement on the fault element and determining the actual position of the fault.
In a third aspect, an embodiment of the present invention further provides a power distribution network fault location apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor is configured to implement the power distribution network fault location method according to any one of the embodiments of the present invention when the computer program is executed.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the power distribution network fault location method according to any of the embodiments of the present invention.
According to the method, a power distribution network fault network is obtained, wherein the power distribution network fault network comprises a plurality of elements; calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element; the fault location is carried out on the fault element, the actual position of the fault is determined, the problems that in the prior art, fault location is invalid due to uncertainty of distributed energy capacity and control and the applicability of power distribution network fault location is low when new energy is accessed are solved, and the fault location of the power distribution network can be carried out quickly and accurately.
Drawings
Fig. 1 is a schematic flowchart of a power distribution network fault location method according to a first embodiment of the present invention;
fig. 2 is a schematic overall architecture diagram of a power distribution network fault location method according to a first embodiment of the present invention;
fig. 3 is a schematic flow chart of another power distribution network fault location method according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power distribution network fault location device in the second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power distribution network fault location device in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flow diagram of a power distribution network fault location method according to an embodiment of the present invention, and fig. 2 is a schematic overall architecture diagram of the power distribution network fault location method according to the first embodiment of the present invention, where this embodiment is applicable to monitoring fault conditions of various elements of a power distribution network in real time and locating a fault element, and the method may be executed by a power distribution network fault location device according to the embodiment of the present invention, and the power distribution network fault location method according to the embodiment of the present invention will be further described with reference to fig. 1 and fig. 2, as shown in fig. 1, the method specifically includes the following steps:
step 101, obtaining a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements.
The power distribution network is a network which is composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive compensation capacitors, auxiliary facilities and the like and can distribute electric energy in a power network, elements are buses and/or segmented lines, specifically, the buses are conducting wires for collecting, distributing and transmitting electric energy and comprise hard buses, soft buses, closed buses and the like, and the power distribution network is not limited in the embodiment of the invention.
Specifically, when a fault point occurs in the power distribution network, the network topology of the power distribution network changes, so that a power distribution network fault network is formed, and the fault position and the power distribution network fault network are different.
Optionally, after the power distribution network fault network is obtained, normalization processing can be performed on the power distribution network fault network; whereinNormalizing the fault current at any element of the power distribution network fault network after the fault current is
Representing the component current injected from one direction,
representing the component current injected from the other direction,
representing the current injected from the element, 0 < alpha < 1.
Specifically, the fault current is injected from any fault point on the line, and the fault current can be equivalent to the fault current with different component sizes respectively injected from two ends of the line, and based on the principle, the power distribution network fault network is subjected to normalization processing, so that the equivalence of external fault lines is realized.
Illustratively, when a line fails, it can be regarded as that a (reverse) current injection point is added at the fault point, and according to the circuit star-delta change, it can be regarded as that a group of currents are respectively injected at two sides of the fault line, wherein the sum of the magnitudes of two groups of newly injected currents is equal to the magnitude of the current injected at one position of the fault point, and the ratio of the magnitudes of the two groups of newly injected currents is inversely proportional to the impedance value from the fault point to two ends of the line. For example, the fault current at fault point A is
Then, the current injected from the failed element can be considered as
It can be equivalent to injecting fault currents with different component sizes from two ends of the line respectively
And
the power distribution network fault network can be normalizedAnd (4) carrying out chemical processing to realize the equivalence of the external fault line.
Specifically, the normalized fault network has the same expression for different fault types (fault point, transition resistance) of the same element, and the difference is only the difference of the current distribution sizes of two sides. Therefore, the position of the normalized fault point can be reflected by the magnitude of component fault current injected at two ends of the line, so that a fault network is determined, and the fault conditions of different elements are represented.
And 102, calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element.
The fault matching value of the element is a numerical value used for reflecting the matching degree between the state estimation value of the current element and the state estimation value when the current element has a fault, and the closer the matching value between the two values is, the better the matching effect is and the higher the possibility that the current element has a fault is. Specifically, the power distribution network fault network topology is matched according to the state estimation result of the minimum fault network, and the position of a fault original can be determined.
Alternatively, the method for calculating the fault matching value of each element may include the following three steps:
step 1, constructing a state estimation equation according to real-time measurement data of a power distribution network fault network and power distribution network wiring topology;
step 2, calculating an estimation result of the system state characteristic quantity according to a state estimation equation;
wherein the state estimation equation is z ═ H · x + r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state.
And 3, calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Estimation result of system state feature quantity
Wherein the content of the first and second substances,r is a variance diagonal matrix of the measurement error. Failure match value J ═ x (z-H)TR-1(z-H·x)。
Specifically, the state characteristics of the system are reflected by real-time measurement data and the wiring topology of the power distribution network, wherein the wiring topology of the power distribution network comprises the actual wiring of the system; the measurement equation information matrix is composed of a node (branch) incidence relation matrix and impedance parameters and can change along with the change of a network structure, and different normalized fault networks have different network structures, so that different fault networks have different node incidence relation matrices and impedance parameters; converting the real-time measured data into sampling values of voltage and current to form a state estimation equation; the estimation result of the system state characteristic quantity can be solved through state estimation, the matching effect of the state estimation result and the actual system state characteristic is represented through a fault matching value, and the fault matching value and the matching effect are in negative correlation, namely the larger the fault matching value is, the worse the matching effect is, and the more deviated the uniformly processed fault network and the actually generated fault network is.
Specifically, the normalized fault network can truly restore the state characteristics of the system when the fault occurs, and since the fault network has a new branch, compared with the measurement equation of the normal network, the state characteristic vector of the fault network and the information matrix of the measurement equation thereof may change, for example, the measurement equation of the normal network is shown in the following formula (1), and when the fault network exists, the measurement equation is shown in the following formula (2):
based on the formula (1) and the formula (2), the state estimation of the fault network can be solved by combining the state estimation equation, the estimation result of the system state characteristic quantity and the fault matching value, so that the fault matching value of the fault network is obtained, and the element corresponding to the fault network with the minimum fault matching value is the fault element.
And 103, carrying out fault location on the fault element, and determining the actual position of the fault.
The method for performing fault location on the fault element and determining the actual position of the fault may include: the actual position of the fault is determined according to (1-alpha) by the magnitude of the component currents injected from two directions measured by the estimation of the system state characteristic quantity.
Optionally, before performing fault location to the faulty component and determining the actual location of the fault, the method further includes: and carrying out fault phase selection according to the fault element.
The fault phase selection is to sum the fault component currents at two ends of the three-phase fault network after the fault element is determined, and judge whether the fault current occurs in the phase, so as to determine the phase category.
Specifically, the fault phase selection is performed according to a fault element, and the fault phase selection method comprises the following steps: constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network; and respectively calculating the sum of the component currents injected from two directions by the A-phase fault network, the B-phase fault network and the C-phase fault network, and carrying out fault phase selection according to whether the phase has fault current or not, wherein if one phase has fault current, the fault option result is the phase.
Optionally, as shown in fig. 2, the power distribution network fault location method integrally includes three parts: (1) a distribution substation layer: the method comprises the following algorithm models of fault original troubleshooting, fault phase selection, fault distance measurement and the like; (2) a communication layer: 100/1000Mbps Ethernet; (3) a measuring device: at a power distribution network data acquisition terminal, terminal equipment is responsible for acquiring the voltage and current magnitude of primary equipment in real time, storing and processing the voltage and current magnitude into a fusion sampling value, and finally sending the fusion sampling value to a power distribution substation layer through a communication module. The fault location of the power distribution network can be completed through the cooperative work of the power distribution substation layer, the communication layer and the measuring device.
Fig. 3 is a schematic flow chart of another power distribution network fault location method according to a first embodiment of the present invention, and as can be seen from fig. 3, the method specifically includes the following steps:
s301, normalizing the power distribution network fault network.
Specifically, fault currents with different components are respectively injected into two ends of a fault line to be equivalent to the fault current of any fault point on the line, the fault line is equivalent from the outside, and the uniqueness of a fault network is reflected by the imbalance of the sizes of the injected current components at the two ends.
S302, converting the data measured in real time into voltage and current sampling values, and establishing a fault network state estimation equation of the element by combining the power distribution network wiring topology.
And S303, estimating and solving the system state.
Specifically, an estimation result of the system state characteristic quantity is obtained, the matching degree between the state estimation result and the system state characteristic is calculated, whether the matching degree is smaller than the current minimum value or not is judged, and the fault element corresponding to the minimum fault network is confirmed.
And S304, carrying out fault phase selection and fault distance measurement.
Specifically, after a fault original is determined, a fault network is respectively constructed for A, B, C three phases, fault component currents at two ends of a A, B, C three-phase fault network can be calculated, the sum of the fault component currents at the two ends of the three-phase fault network is solved, whether a fault current occurs in the phase is judged, and fault phase selection is performed according to the criterion. Then, the magnitude of the two-terminal fault component current measured by the state estimation result is used for calculating and carrying out fault distance measurement by a mode of (1-alpha): alpha.
According to the technical scheme of the embodiment, a power distribution network fault network is obtained and comprises a plurality of elements; calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element; the method comprises the steps of carrying out fault location on a fault element, determining the actual position of a fault, solving the problems of failure of fault location caused by uncertainty of distributed energy capacity and control and low applicability of fault location of a power distribution network when new energy is accessed in the prior art, taking the current and voltage values of the power distribution network measured in real time as data support, considering different expression forms of the fault network, carrying out fault network judgment through a state characteristic calculation mode of a state estimation system, carrying out troubleshooting on a fault original element, carrying out fault distance measurement of fault phase judgment, and carrying out power distribution network fault location quickly and accurately.
Example two
The distribution network fault positioning device provided by the second embodiment of the invention can execute the distribution network fault positioning method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 4 is a schematic structural diagram of a power distribution network fault location device provided in the second embodiment, as shown in fig. 4, including: an information acquisition module 401, a faulty component matching module 402 and a faulty location determination module 403.
The information obtaining module 401 is configured to obtain a power distribution network fault network, where the power distribution network fault network includes multiple elements.
And a faulty component matching module 402, configured to calculate a fault matching value for each component, and select a component with a smallest fault matching value as a faulty component.
And a fault location determining module 403, configured to perform fault location measurement on the faulty component, and determine an actual location of the fault.
The distribution network fault location device provided by this embodiment is a distribution network fault location method implemented in the above embodiments, and the implementation principle and technical effect of the distribution network fault location device provided by this embodiment are similar to those of the above embodiments, and are not repeated here.
Optionally, the device further includes an information processing module, configured to perform normalization processing on the power distribution network fault network after the power distribution network fault network is obtained; wherein the fault current at any element of the power distribution network fault network after normalization processing is
Representing the component current injected from one direction,
representing component currents injected from another direction，
Representing the current injected from the element, 0 < alpha < 1.
Optionally, the fault element matching module 402 is specifically configured to construct a state estimation equation according to the real-time measurement data of the power distribution network fault network and the power distribution network connection topology; calculating an estimation result of the system state characteristic quantity according to a state estimation equation; and calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Optionally, the state estimation equation is z ═ H · x + r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state; estimation result of system state feature quantity
Wherein, R is a variance diagonal matrix of the measurement error; failure match value J ═ x (z-H)TR-1(z-H·x)。
Optionally, the fault location determining module 403 is specifically configured to determine the actual location of the fault according to (1- α): α, based on the magnitudes of the component currents injected from two directions measured by the estimation result of the system state characteristic quantity.
Optionally, the apparatus further comprises: and the fault phase selection module is used for carrying out fault phase selection according to the fault element before fault distance measurement is carried out on the fault element and the actual position of the fault is determined.
Optionally, the fault phase selection module is specifically configured to construct a three-phase fault network, where the three-phase fault network includes an a-phase fault network, a B-phase fault network, and a C-phase fault network; and respectively calculating the sum of the component currents injected from two directions by the A-phase fault network, the B-phase fault network and the C-phase fault network, and performing fault phase selection according to whether the phase has fault current or not.
Optionally, the element is a busbar and/or a segmented line.
EXAMPLE III
Fig. 5 is a schematic structural diagram of a power distribution network fault location device in a third embodiment of the present invention. Fig. 5 illustrates a block diagram of an exemplary power distribution network fault location device 12 suitable for use in implementing embodiments of the present invention. The power distribution network fault locating device 12 shown in fig. 5 is only an example and should not impose any limitations on the functionality and scope of use of embodiments of the present invention.
As shown in fig. 5, the distribution network fault locating device 12 is in the form of a general purpose computing device. The components of the power distribution network fault locating device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The power distribution network fault location device 12 typically includes a variety of computer system readable media. These media may be any available media that can be accessed by the distribution network fault locating device 12 and include both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. The power distribution network fault location device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, and commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Power distribution network fault locating device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with power distribution network fault locating device 12, and/or with any device (e.g., network card, modem, etc.) that enables power distribution network fault locating device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. In the distribution network fault location device 12 of the present embodiment, the display 24 is not provided as a separate body but is embedded in a mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. Moreover, the distribution network fault locating device 12 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 20. As shown in fig. 5, the network adapter 20 communicates with other modules of the power distribution network fault locating device 12 via the bus 18. It should be appreciated that although not shown in fig. 5, other hardware and/or software modules may be used in conjunction with the power distribution network fault locating device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing by running a program stored in the system memory 28, for example, to implement the power distribution network fault location method provided by the embodiment of the present invention, the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element;
and carrying out fault location on the fault element, and determining the actual position of the fault.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a power distribution network fault location method according to all embodiments of the present invention, where the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element;
and carrying out fault location on the fault element, and determining the actual position of the fault.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power distribution network fault positioning method is characterized by comprising the following steps:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting the element with the minimum fault matching value as a fault element;
and carrying out fault location on the fault element, and determining the actual position of the fault.
2. The power distribution network fault location method according to claim 1, further comprising, after acquiring the power distribution network fault network:
carrying out normalization processing on the power distribution network fault network;
the normalized fault current of any element of the power distribution network fault network is
Representing the component current injected from one direction,
representing the component current injected from the other direction,
to representThe current injected from the element is 0 < alpha < 1.
3. The power distribution network fault location method of claim 2, wherein the calculating the fault match value for each of the elements comprises:
constructing a state estimation equation according to the real-time measurement data of the power distribution network fault network and the power distribution network wiring topology;
calculating an estimation result of the system state characteristic quantity according to the state estimation equation;
and calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
4. The power distribution network fault location method of claim 3,
the state estimation equation is z ═ H · x + r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state;
estimation result of the system state feature quantity
Wherein, R is a variance diagonal matrix of the measurement error;
the fault matching value J ═ (z-H. x)TR-1(z-H·x)。
5. The power distribution network fault location method according to claim 3 or 4, wherein the fault location of the fault element and the actual location of the fault are determined by performing fault location, including:
the actual position of the fault is determined according to (1-alpha) by the magnitude of the component current injected from two directions measured by the estimation result of the system state characteristic quantity.
6. The power distribution network fault location method according to any one of claims 1 to 4, wherein before performing fault location for the faulty element and determining an actual location of a fault, the method further comprises:
and carrying out fault phase selection according to the fault element.
7. The power distribution network fault location method of claim 6, wherein the performing fault phase selection according to the fault element comprises:
constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network;
and respectively calculating the sum of the component currents injected from two directions by the A-phase fault network, the B-phase fault network and the C-phase fault network, and performing fault phase selection according to whether the phase has fault current or not.
8. Method for fault location in an electric distribution network according to claim 1, characterized in that the elements are busbars and/or sectionalised lines.
9. A distribution network fault locating device, characterized by includes: memory, a processor and a computer program stored on the memory and executable on the processor, the processor being adapted to implement the power distribution network fault localization method according to any of claims 1 to 8 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out a method for fault location of a power distribution network according to any one of claims 1 to 8.
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