CN110687391A - Intelligent power distribution network fault judgment system - Google Patents
Intelligent power distribution network fault judgment system Download PDFInfo
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- CN110687391A CN110687391A CN201910791634.6A CN201910791634A CN110687391A CN 110687391 A CN110687391 A CN 110687391A CN 201910791634 A CN201910791634 A CN 201910791634A CN 110687391 A CN110687391 A CN 110687391A
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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 relates to a power distribution network fault intelligent judgment system, which comprises: the system comprises a power distribution network main control station, a fault positioning device and power distribution terminal equipment; the power distribution network main control station is suitable for sending power supply data of power distribution terminal equipment to the fault positioning device; the fault positioning device is suitable for acquiring electric energy data of each monitoring point, determining the position of a power distribution network fault line according to the electric energy quantity and power supply data of power distribution terminal equipment, and then sending the position of the power distribution network fault line to a power distribution network main control station; the power distribution network main control station is suitable for controlling a load switch in the power distribution network to isolate a fault section according to the position of a fault line of the power distribution network and controlling a tie switch in the power distribution network to transfer the load at the fault position; the method can quickly and accurately determine the position of the fault line of the power distribution network, greatly shortens the operation time of fault finding and switching equipment, and enhances the power supply quality and the power supply reliability of the power distribution network.
Description
Technical Field
The invention belongs to the technical field of fault diagnosis, and particularly relates to an intelligent power distribution network fault judgment system.
Background
With the rapid development of the power grid in China, the scale of the power distribution network of the power system is continuously enlarged, the requirement of power consumers on the power supply quality is improved, and the safety and the reliability become important indexes for measuring the performance of the power grid in China. On one hand, the performance of the power grid needs to meet the requirement of distribution network faults, and on the other hand, when a circuit fails, the type and the fault node of the fault need to be rapidly judged so as to process the fault as much as possible and reduce the loss caused by the distribution fault. Because the overhead transmission line for long-distance transmission not only has complex terrain along the way, but also has larger difference of environmental climate, the high-quality power supply pressure of power supply enterprises is larger and larger, and various types of faults are easy to occur. In addition, overhead line is because the branch line is more, and transmission line structure is complicated moreover to it is very big to make to use traditional manual work to investigate the trouble degree of difficulty.
Disclosure of Invention
The invention aims to provide an intelligent power distribution network fault judgment system.
In order to solve the technical problem, the invention provides an intelligent power distribution network fault judgment system, which comprises: the system comprises a power distribution network main control station, a fault positioning device and power distribution terminal equipment; the power distribution network main control station is suitable for sending power supply data of power distribution terminal equipment to the fault positioning device; the fault positioning device is suitable for acquiring electric energy data of each monitoring point, determining the position of a power distribution network fault line according to the electric energy quantity and power supply data of power distribution terminal equipment, and then sending the position of the power distribution network fault line to a power distribution network main control station; and the power distribution network main control station is suitable for controlling a load switch in the power distribution network to isolate a fault section according to the position of a fault line of the power distribution network and controlling a contact switch in the power distribution network to transfer the load at the fault position.
Further, the fault locating device includes: the electric energy metering module is electrically connected with the main control unit; the electric energy metering module is suitable for collecting electric energy data of each monitoring point and sending the electric energy data to the main control unit; and the main control unit is suitable for receiving power supply data of the power distribution terminal equipment from the power distribution network main control station through the communication module.
Further, the fault locating device further comprises: the data storage module is electrically connected with the main control unit; the data storage module is adapted to store electrical energy data.
Further, the fault locating device further comprises: the display module is electrically connected with the main control unit; the display module is suitable for displaying position information and fault alarm information of the power distribution network fault line.
Further, the fault locating device further comprises: the key module is electrically connected with the main control unit; the key module is suitable for calibrating the current direction in the power distribution network in the main control unit, and meanwhile sequencing all monitoring points and interconnection switches to generate a network matrix model of the power distribution network.
Further, the signal transmission circuit of the communication module includes: the device comprises a resonant power amplifying circuit and a signal coupling circuit; the signal receiving circuit of the communication module includes: the device comprises a passive band-pass filter circuit, a signal coupling circuit and an analog front-end chip.
The power distribution network fault intelligent judgment system has the advantages that the position of a power distribution network fault line can be quickly and accurately determined through the fault positioning device when the power distribution network has a fault, the position of the power distribution network fault line is sent to the power distribution network main control station, the fault section is isolated through quick switching of the load switch, and power is recovered to the non-fault section through the interconnection switch, so that the superiority of the power distribution network fault intelligent judgment system in fault handling is reflected, namely the power distribution network fault intelligent judgment system greatly shortens fault finding time, reduces operation time of equipment such as the load switch and the interconnection switch, and accordingly improves power supply quality and power supply reliability of the power distribution network.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a functional block diagram of an intelligent decision system for power distribution network faults of the present invention;
fig. 2 is a schematic diagram of one power distribution network power supply principle applied to the intelligent power distribution network fault determination system of the invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the present embodiment provides an intelligent power distribution network fault determination system, including: the system comprises a power distribution network main control station, a fault positioning device and power distribution terminal equipment; the power distribution network main control station is suitable for sending power supply data of power distribution terminal equipment to the fault positioning device; the fault positioning device is suitable for acquiring electric energy data of each monitoring point, determining the position of a power distribution network fault line according to the electric energy quantity and power supply data of power distribution terminal equipment, and then sending the position of the power distribution network fault line to a power distribution network main control station; and the power distribution network main control station is suitable for controlling a load switch in the power distribution network to isolate a fault section according to the position of a fault line of the power distribution network and controlling a contact switch in the power distribution network to transfer the load at the fault position.
Specifically, this distribution network trouble intelligence decision system can be when the distribution network breaks down through fault positioning device, the position of distribution network trouble circuit is confirmed fast accurately, and send the position of distribution network trouble circuit to distribution network main control station, keep apart the trouble section through load switch's quick switching, resume the power supply to the non-trouble section through the contact switch, the superiority of distribution network trouble intelligence decision system to handling the trouble has been embodied, this distribution network trouble intelligence decision system very big has shortened trouble search time promptly, the operating time of equipment such as load switch, contact switch has been reduced, thereby the power supply quality of distribution network and the reliability of power supply have been strengthened.
Further, the fault locating device includes: the electric energy metering module is electrically connected with the main control unit; the electric energy metering module is suitable for collecting electric energy data of each monitoring point and sending the electric energy data to the main control unit; and the main control unit is suitable for receiving power supply data of the power distribution terminal equipment from the power distribution network main control station through the communication module.
Specifically, the communication module is a serial communication module.
Further, the fault locating device further comprises: the data storage module is electrically connected with the main control unit; the data storage module is adapted to store electrical energy data.
Further, the fault locating device further comprises: the display module is electrically connected with the main control unit; the display module is suitable for displaying position information and fault alarm information of the power distribution network fault line.
Further, the fault locating device further comprises: the key module is electrically connected with the main control unit; the key module is suitable for calibrating the current direction in the power distribution network in the main control unit, and meanwhile sequencing all monitoring points and interconnection switches to generate a network matrix model of the power distribution network.
Specifically, the method for calibrating the current direction in the power distribution network includes: aiming at the condition that the closed loop network and the single-power-supply network work in an open loop mode, the direction of current refers to the positive direction of a power distribution network; for the distribution line of the multi-power closed-loop network, only a single power supply is supposed to be arranged when the positive direction of the distribution line is defined, the power supply is arranged as the load of the micro-end of the feeder line, and the current direction is the current direction according to the positive direction flow.
Further, the signal transmission circuit of the communication module includes: the device comprises a resonant power amplifying circuit and a signal coupling circuit; the signal receiving circuit of the communication module includes: the device comprises a passive band-pass filter circuit, a signal coupling circuit and an analog front-end chip.
Specifically, when the power distribution network fails, the main control unit obtains an information collection matrix according to the real-time electric energy data of each monitoring point and the power supply data of the power distribution network terminal equipment, and obtains an information identification matrix through calculation of the information collection matrix; then the main control unit determines the position of a power distribution network fault line through the numerical values of nodes, elements and factors in the information collection matrix; and finally, displaying the position information and the fault alarm information of the power distribution network fault line through a display module.
Specifically, after the position of the power distribution network fault line is determined, the main control unit transmits the position of the power distribution network fault line to a power distribution network main control station through a communication module, the power distribution network main control station isolates a fault area, contact switches are inquired according to the running mode of each line in the isolated system, loads are automatically transferred, and automatic processing of faults is achieved.
Specifically, the network matrix model is obtained in the following manner:
the order of the network matrix model is the number of nodes of the power distribution network, all elements of diagonal lines of the network matrix model are set to be 1, in other elements, if one feeder path is arranged between a node i and a node j of the power distribution network and the trend is from i to j, parameters of an ith row and a jth column in the matrix are defined to be 1, and elements in other cases are defined to be 0.
As shown in fig. 2, in this embodiment, five fault points are set, and one interconnection switch point is taken as an example, that is, the order of the network matrix model is six orders, the power supply a and the power supply B are actually existing power supplies in the power distribution network, and an arrow above each monitoring point is a reference positive direction of the power distribution network, then the network matrix model is:
specifically, the information collection matrix is obtained in the following manner:
setting the number of nodes in the distribution network to be N, the information collection matrix with problems is an Nx 1 dimensional matrix, and the parameter F in the matrixi(i ═ 1,2, …, N) is defined as:
if F i1, indicating that fault current exists in the ith node, and the current direction is the same as the assumed direction of the network;
if Fi0, indicating no fault current at the ith node;
if FiAnd-1, the fault current exists in the ith node, and the current direction is opposite to the assumed direction of the network.
Taking the example of setting five fault points and one tie switch point in this embodiment, assume that when a problem occurs in the path between the second node and the third node and the path between the fourth node and the fifth node at a certain time, according to FiThe information collection matrix is:
F＝[1 1 0 0 -1 -1]；
specifically, the information discrimination matrix is obtained in the following manner:
the information discrimination matrix is calculated from the information collection matrix after modification, i.e.
If the node passed by the circuit with the problem is the tail part of the feeder line with the problem, the node parameter which is not 0 in the information collection matrix is properly changed to generate an information identification matrix;
the construction factor of the information discrimination matrix is divided into the following two conditions:
when F is presentiWhen 1, assume that there is every D in the network matrix model ij1, and F i1, the ith factor P in the information discrimination matrixiNot equal to 0, otherwise Pi＝1；
When F is presentiWhen the value is-1, only one D exists in the ith row factor in the network matrix model ij1 and FjWhen is equal to-1, then PjIf not, otherwise Pj＝-1。
Specifically, the main control unit determines the position of the fault line by numerically determining the nodes, elements and factors of the information collection matrix in the following manner:
assuming that there is a node P in the information discrimination matrixiIf the number of the feeder lines is 1, the feeder line with the node i as an initiating end in the reference flow direction of the fake certificate is in a problem, namely the tail feeder line of the node i has a problem line;
suppose PiIf the current is equal to-1, it indicates that a feeder circuit with the node i as an output end has a fault in the assumed reference flow direction, and also indicates that the front-end feeder line of the node i belongs to a fault line;
element F in the information collection matrixiWhen the number of the nodes i is equal to 1, the situation that a defined flow direction exists, a problem circuit exists in the feeder line which is used as the starting end according to the node i, the feeder line is attributed to the fault range, and the network matrix model has the function of D if D existsijIf the node is 1(i ≠ j), it indicates that one directly connected feeder line exists between the nodes i and j, and the current direction is from i to j; if element F j1 indicates that there is also a fault current passing through node j and there is no problem circuit between i and j, i.e. it is proved that the problem circuit enters from one end of the line but does not exit from the other end, so the feeder lines in i and j fall within the fault range, P i1 is ═ 1; assuming that D does not exist in the network matrix modelijPoint 1(i ≠ j), meaning that node i is attributed to the originating end of the tail feeder wire, and since F i1, the tail feeder line is attributed to the line with the fault;
if element F in the information collection matrix is presentjIf the node i is a faulty line in the line serving as the originating end, the probability of the faulty line being included in this line is verified to be-1; assuming that only one parallel line factor in the i column factors in the network matrix model is a factor D of 1ij(i ≠ j), which indicates that between nodes i and jThere is an interconnecting path between them; if element FjIf-1, it turns out that the fault current passes through nodes j and i, and the directions of the fault currents passing through the two nodes are consistent; thus, the line connecting nodes j and i is not the faulty part, Pi0; if network node exists D jm1, and FmAnd (m) is equal to j, the fault is shown to be in the area among i, j and m, the current of no less than 2 power supplies flows through the node m and is reflected in the opposite direction of the power distribution network, and the node i belongs to the line and is an input node, so that the fault section is judged to be the fault section, and the fault section is Pi0, in contrast to PiIn this case, in the positive direction of the distribution network, the output is indicated as a fault area as a function of the supply current flow direction of the node.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The utility model provides a distribution network fault intelligence decision system which characterized in that includes:
the system comprises a power distribution network main control station, a fault positioning device and power distribution terminal equipment; wherein
The power distribution network main control station is suitable for sending power supply data of power distribution terminal equipment to the fault positioning device;
the fault positioning device is suitable for acquiring electric energy data of each monitoring point, determining the position of a power distribution network fault line according to the electric energy quantity and power supply data of power distribution terminal equipment, and then sending the position of the power distribution network fault line to a power distribution network main control station; and
the power distribution network main control station is suitable for controlling a load switch in the power distribution network to isolate a fault section according to the position of a fault line of the power distribution network and controlling a contact switch in the power distribution network to transfer the load at the fault position.
2. The system according to claim 1, wherein the fault of the distribution network is intelligently determined,
the fault locating device comprises: the electric energy metering module is electrically connected with the main control unit; wherein
The electric energy metering module is suitable for collecting electric energy data of each monitoring point and sending the electric energy data to the main control unit; and
the main control unit is suitable for receiving power supply data from power distribution terminal equipment of the power distribution network main control station through the communication module.
3. The system according to claim 2, wherein the fault of the distribution network is intelligently determined,
the fault locating device further comprises: the data storage module is electrically connected with the main control unit;
the data storage module is adapted to store electrical energy data.
4. The system according to claim 3, wherein the fault of the distribution network is intelligently determined,
the fault locating device further comprises: the display module is electrically connected with the main control unit;
the display module is suitable for displaying position information and fault alarm information of the power distribution network fault line.
5. The system according to claim 4, wherein the fault of the distribution network is intelligently determined,
the fault locating device further comprises: the key module is electrically connected with the main control unit;
the key module is suitable for calibrating the current direction in the power distribution network in the main control unit, and meanwhile sequencing all monitoring points and interconnection switches to generate a network matrix model of the power distribution network.
6. The system according to claim 5, wherein the fault is determined intelligently by the power distribution network,
the signal transmission circuit of the communication module includes: the device comprises a resonant power amplifying circuit and a signal coupling circuit;
the signal receiving circuit of the communication module includes: the device comprises a passive band-pass filter circuit, a signal coupling circuit and an analog front-end chip.
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