CN114609479A - Fault positioning method and device, electronic equipment and storage medium - Google Patents
Fault positioning method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a fault positioning method, a fault positioning device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring historical topology information and real-time topology information of an installation node of a fault detection device, matching whether the historical topology information is the same as the real-time topology information or not, if not, recalculating and updating traveling wave voltage time in the real-time topology information, detecting traveling wave voltage data on an overhead line, and positioning a line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information. By providing the fault positioning method, the invention realizes non-contact detection and positioning of the faults of the overhead line and improves the reliability and stability of the power grid.
Description
Technical Field
The present invention relates to the field of fault location technologies, and in particular, to a fault location method and apparatus, an electronic device, and a storage medium.
Background
With the rapid development of economy in China, the requirements of users on power supply reliability and stability are continuously improved. The overhead line is used as a key junction for connecting a power grid and power consumers, and the reliability and stability of the overhead line are directly related to the power consumption experience of power consumers and the social evaluation of the power grid. However, since the overhead line is exposed outdoors throughout the year, it is greatly affected by external factors such as weather and temperature, and a failure frequently occurs, resulting in interruption of power supply.
At present, the electric power company mainly uses the manual inspection mode to patrol and examine the location of overhead line trouble and is leading, and after the trouble takes place promptly, the power maintenance personnel go to the trouble region that is influenced, follow circuit inspection, isolation and location and break down. The traditional fault positioning method has low efficiency, often cannot position the accurate position of a fault, cannot meet the requirements of a power company on the average system power failure time index and the average user power failure time index, and brings economic and reputation loss. With the development of high-speed microprocessors and global positioning system technologies and the reduction of the cost thereof, synchronous detection devices are used for detecting overhead line faults in a power grid, the detection devices need to be in contact with a detected lead or equipment, the topology and the stability of the original system are changed, even negative effects are caused, and the detection devices are difficult to implement in practical application and high in cost.
Therefore, in order to improve the reliability and stability of a power grid and solve the technical problem that the topology and stability of the original system are changed when the synchronous detection device is adopted to detect the faults of the overhead line at present, a fault positioning method is urgently needed to be constructed.
Disclosure of Invention
The invention provides a fault positioning method, a fault positioning device, electronic equipment and a storage medium, and solves the technical problem that the existing method can change the topology and stability of the original system when detecting the faults of an overhead line through a synchronous detection device.
In a first aspect, the present invention provides a fault location method, including:
acquiring historical topology information and real-time topology information of a fault detection device installation node;
matching whether the historical topology information and the real-time topology information are the same; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
detecting traveling wave voltage data on the overhead line;
and positioning the line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information.
Optionally, before detecting the traveling wave voltage data on the overhead line, the method further includes:
and carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
Optionally, based on the traveling wave voltage time and the traveling wave voltage data, in combination with an euclidean standard vector norm and a first-order optimality condition, positioning a line fault location to obtain line fault location information, including:
establishing a fault location equation based on the traveling wave voltage time and the traveling wave voltage data;
and calculating to obtain the line fault position information by combining the fault positioning equation according to the Euclidean standard vector norm and the first-order optimality condition.
Optionally, the traveling wave voltage data includes arrival time of a fault traveling wave voltage signal collected by the detection device; establishing a fault location equation based on the traveling wave voltage time and the traveling wave voltage data, comprising:
setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and establishing the fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data and by combining the parameters.
In a second aspect, the present invention provides a fault location device, comprising:
the acquisition module is used for acquiring historical topology information and real-time topology information of the installation node of the fault detection device;
the updating module is used for matching whether the historical topology information is the same as the real-time topology information; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
the detection module is used for detecting traveling wave voltage data on the overhead line;
and the positioning module is used for positioning the line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information.
Optionally, the apparatus further comprises:
and the synchronization module is used for carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
Optionally, the positioning module comprises:
the establishing submodule is used for establishing a fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data;
and the positioning submodule is used for calculating to obtain the line fault position information by combining the fault positioning equation according to the Euclidean standard vector norm and the first-order optimality condition.
Optionally, the traveling wave voltage data includes arrival time of a fault traveling wave voltage signal collected by the detection device; the establishing submodule comprises:
the parameter unit is used for setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and the establishing unit is used for establishing the fault positioning equation by combining the parameters based on the traveling wave voltage time and the traveling wave voltage data.
In a third aspect, the present application provides an electronic device comprising a processor and a memory, wherein the memory stores computer readable instructions, and the computer readable instructions, when executed by the processor, perform the steps of the method as provided in the first aspect.
In a fourth aspect, the present application provides a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method as provided in the first aspect above.
According to the technical scheme, the invention has the following advantages: the invention provides a fault positioning method, which comprises the steps of obtaining historical topology information and real-time topology information of a fault detection device installation node, matching whether the historical topology information is the same as the real-time topology information, if not, recalculating and updating traveling wave voltage time in the real-time topology information, detecting traveling wave voltage data on an overhead line, positioning a line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition, obtaining line fault position information, solving the technical problem that the existing method can change the topology and stability of the original system when detecting the overhead line fault through a synchronous detection device, realizing non-contact detection and positioning of the overhead line fault, the reliability and the stability of the power grid are improved.
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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating a first embodiment of a fault location method according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a fault location method according to the present invention;
FIG. 3 is a block diagram of an overhead line non-contact fault locating device of the present invention;
FIG. 4 is a schematic structural diagram of a non-contact voltage sensor in the non-contact fault location device for an overhead line according to the present invention;
FIG. 5 is a schematic diagram illustrating a principle of establishing a fault location equation in a fault location method according to the present invention;
fig. 6 is a schematic diagram of an application of the fault location method of the present invention in a power grid system;
fig. 7 is a block diagram of a fault location device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a fault positioning method and device, electronic equipment and a storage medium, which are used for solving the technical problem that the existing method can change the topology and stability of the original system when the synchronous detection device is used for detecting the faults of an overhead line.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In a first embodiment, referring to fig. 1, fig. 1 is a flowchart illustrating a first flow step of a first embodiment of a fault location method according to the present invention, including:
step S101, acquiring historical topology information and real-time topology information of a fault detection device installation node;
in the embodiment of the invention, the historical topological information and the real-time topological information of the installation node of the fault detection device are obtained through the overhead line non-contact type fault positioning device.
Step S102, whether the historical topology information is the same as the real-time topology information is matched; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
the traveling wave voltage time is a time during which the fault traveling wave voltage propagates from the starting point of the line to the detection device.
In the embodiment of the invention, whether the historical topology information and the real-time topology information are matched is the same; if not, the real-time topology information is updated, and traveling wave voltage time in the topology information needs to be recalculated and updated; if yes, the topology information is not updated, and the next step is directly executed.
Step S103, detecting traveling wave voltage data on the overhead line;
in the embodiment of the invention, the detection device of the fault detection device installation node is subjected to time synchronization processing and communication testing, so that the time synchronization and communication among all the detection devices are ensured to be normal, and then the detection device is used for detecting the traveling wave voltage data on the overhead line.
And step S104, based on the traveling wave voltage time and the traveling wave voltage data, positioning the line fault position by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information.
It should be noted that the norm of the euclidean standard vector (also called euclidean distance) is a commonly used distance definition, and refers to the true distance between two points in an m-dimensional space, or the natural length of the vector (i.e., the distance from the point to the origin). The euclidean distance in two and three dimensions is the actual distance between two points.
The first-order optimal condition is the first-order derivation, the optimal value of the first-order function.
In the embodiment of the invention, a fault positioning equation is established based on the traveling wave voltage time and the traveling wave voltage data, and the fault positioning equation is solved by utilizing the Euclidean standard vector norm and a first-order optimality condition to obtain the line fault position information.
In the fault location method provided by the embodiment of the invention, the historical topology information and the real-time topology information of the installation node of the fault detection device are obtained, whether the historical topology information and the real-time topology information are the same or not is matched, if not, the traveling wave voltage time in the real-time topology information is recalculated and updated, the traveling wave voltage data on the overhead line is detected, the line fault location is located by combining Euclidean standard vector norm and a first-order optimality condition based on the traveling wave voltage time and the traveling wave voltage data, and the line fault location information is obtained, through the fault location method, the technical problem that the existing method can change the topology and stability of the original system when the overhead line fault is detected through a synchronous detection device at present is solved, and the non-contact detection and location of the overhead line fault are realized, the reliability and the stability of the power grid are improved.
In a second embodiment, referring to fig. 2, fig. 2 is a flowchart illustrating a method for locating a fault according to the present invention, including:
step S201, acquiring historical topology information and real-time topology information of a fault detection device installation node;
in the embodiment of the invention, the historical topological information and the real-time topological information of the installation node of the fault detection device are obtained through the overhead line non-contact type fault positioning device.
In specific implementation, please refer to fig. 3, fig. 3 is a block diagram of a non-contact fault location device for an overhead line according to the present invention, where 1 is a non-contact voltage sensor, and 2 is a signal conditioning unit; 3, a data acquisition unit, 4, a wireless communication unit, 5, a global positioning system unit, 6, a microprocessor unit, 7, a fault positioning equation establishing unit, 8, a fault positioning equation solving unit and 9, a cloud computing processing unit;
the non-contact voltage sensor 1 is used for detecting fault traveling wave voltage signals of the overhead line in a non-contact manner;
the signal conditioning unit 2 is used for filtering and amplifying the collected fault traveling wave voltage signals;
the data acquisition unit 3 is used for sampling the fault traveling wave voltage signal processed by the signal conditioning circuit in real time;
the wireless communication unit 4 is used for communication between the cloud computing processing unit and the detection device;
the global positioning system unit 5 is used for accurately synchronizing time among different detection devices;
the microprocessor unit 6 is used for acquiring the arrival time of the fault traveling wave voltage and coordinating the work of the control signal conditioning unit, the data acquisition unit, the wireless communication unit and the global positioning system unit;
the cloud computing processing unit 9 is configured to control the detection devices at the nodes and perform computation for accurately positioning a fault;
the cloud computing processing unit 9 comprises the fault location equation establishing unit 7 and the fault location equation solving unit 8;
the fault positioning equation establishing unit 7 is used for establishing a fault positioning equation;
and the fault location equation solving unit 8 is used for calculating to obtain accurate fault location information by combining the fault information obtained by the detection device at each node with the fault location equation.
When the device is used, the detection device is arranged at the existing reclosing device or switch of the overhead line, and the non-contact voltage sensor 1 collects an original fault traveling wave voltage signal. The signal conditioning unit 2 performs filtering and amplification processing on the signal acquired by the non-contact voltage sensor 1. The data acquisition unit 3 is used for carrying out high-speed acquisition and cache processing on the fault voltage signal. The wireless communication unit 4 is used to detect the exchange of data and information between the apparatus and the cloud computing processing unit 9. The gps unit 5 provides accurate time synchronization for each detection device. And the microprocessor unit 6 acquires the arrival time of the traveling wave voltage and coordinates and controls the orderly and stable operation of each unit. The cloud computing processing unit 9 is used for communicating with each detection device, acquiring fault information measured by the detection devices, and calculating to obtain accurate fault positioning information by applying the fault positioning equation establishing unit 7 and the fault positioning equation solving unit 8.
The non-contact fault positioning device for the overhead line can be integrated in the existing parts of a reclosing device, a switching device and the like of a power grid.
Wherein, the non-contact voltage sensor 1 is a ball plate type electrode structure; the bandwidth of the signal conditioning unit 2 is 8-12MHz, and the gain is 60 dB; the sampling rate of the data acquisition unit 3 is 30 MHz; the accurate synchronization error of the reference time of the detection device is ns level; parameters used for establishing a fault location equation are the propagation time of traveling wave voltage in the topology and the arrival time of fault traveling wave voltage signals acquired by a detection device; when the fault location equation is solved, the Euclidean standard vector norm and a first-order optimality condition are used for quickly solving and locating; and the establishment and the solution of the fault location equation are carried out in the cloud processing computing unit.
The non-contact voltage sensor 1 adopts a ball plate electrode structure, the diameter of a ball is 10cm, the diameter of a plate is 12cm, the vertical distance between the ball and the plate is 3cm, and the fault traveling wave voltage on a line can be detected by utilizing the capacitance induction between the ball plate electrodes. When in use, the non-contact voltage sensor 1 can detect an original fault voltage signal and transmit the original voltage signal to the signal conditioning unit 2.
The signal conditioning unit 2 mainly comprises a passive band-pass filter circuit and a gain module. The passive band-pass filter circuit has a-3 dB bandwidth of 8-12MHz, the gain module adopts two ADL5531 chips with a single module gain of 30dB and a working frequency of DC to 500MHz, the total gain is 60dB, and the filtering and amplification processing of fault voltage signals can be realized.
The data acquisition unit 3 adopts a high-speed data acquisition card, the sampling rate is up to 30MHz, the resolution ratio is 16 bits, the storage depth is 32MB, and the high-speed sampling and caching of the fault voltage signal can be realized.
The wireless communication unit 4 adopts an SX1278 type Lora wireless module, the working frequency is 525MHz, the maximum transmitting power is 20dBm, and the capacity of a buffer area is up to 256 bytes. When the wireless communication unit 4 is used, data communication and transmission are completed between the wireless communication unit 4 and the cloud computing processing unit 9.
The global positioning system unit 5 adopts a WT-NEO6M type GPS module, and the time service precision reaches ns level, so that the accurate synchronization of the time reference of each detection device is realized.
The microprocessor unit 6 adopts an STM32L496 type low-power processor chip. When the wireless communication device is used, the microprocessor unit 6 coordinates and controls the non-contact voltage sensor 1, the signal conditioning unit 2 and the data acquisition unit 3 to acquire and preprocess fault voltage signals, calculates the arrival time of the fault traveling wave voltage signals, and controls the wireless communication unit 4 and the cloud computing processing unit 9 to communicate and transmit data.
The non-contact fault positioning method is characterized in that a cloud computing processing unit 9 communicates with detection devices at nodes through a wireless communication unit 4, traveling wave voltage time is updated according to topology information of the detection devices, a global positioning system unit 5 realizes accurate synchronization of time references of the detection devices at different nodes, a non-contact voltage sensor 1 collects fault voltage signals, a signal conditioning unit 2 and a data collecting unit 3 perform filtering amplification, collection and caching on the fault voltage signals, a microprocessor unit 6 extracts the arrival time of the fault voltage signals and uploads the arrival time of the fault voltage signals and related fault information to the cloud computing processing unit 9 through the wireless communication unit 4, the cloud computing processing unit 9 performs positioning calculation on the fault information uploaded by the detection nodes by using a fault positioning equation establishing unit and a fault positioning equation solving unit, and obtaining accurate positioning information of the fault.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a non-contact voltage sensor in the non-contact fault location device for an overhead line according to the present invention. The non-contact voltage sensor mainly comprises a ball electrode, a plate electrode, a connecting piece and two electrode joints. The diameter of the ball electrode is 10cm, a hollow structure is adopted, the diameter of the plate electrode is 10cm, and the length of the connecting piece is 3 cm. The ball electrode and the plate electrode are both made of brass, the connecting piece is made of high-hardness epoxy resin, and the electrode joint is made of an SMA joint. Capacitance exists between the ball electrode and the plate electrode, and the capacitance can couple fault voltage signals on the overhead line. When the overhead line has a fault, a corresponding fault traveling wave voltage signal is generated and transmitted on the line. In practical use, the non-contact voltage sensor is arranged at the existing equipment such as a switch of a line, and a fault traveling wave voltage signal on the line can be detected through capacitive inductive coupling, so that the non-contact detection of the fault voltage of the overhead line is realized.
Step S202, whether the historical topology information is the same as the real-time topology information is matched; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
in the embodiment of the invention, whether the historical topology information and the real-time topology information are matched is the same; if not, the real-time topology information is updated, and traveling wave voltage time in the topology information needs to be recalculated and updated; if yes, the topology information is not updated, and the next step is directly executed.
In the specific implementation, fault detection devices are installed in part of nodes, and no fault detection device is installed in the other part of nodes, during the detection process, if the fault detection device is removed from the node where the fault detection device is installed or the fault detection device is installed in the node where the fault detection device is not installed, the topology information is updated, when the topology information is detected to be updated, traveling wave voltage time in the topology information is recalculated and updated, the traveling wave voltage time is the time for the fault traveling wave voltage to propagate from the starting point of the line to the detection device, and when the topology information is not updated, the next step is directly executed.
Step S203, detecting traveling wave voltage data on the overhead line;
in an optional embodiment, before detecting traveling wave voltage data on the overhead line, the method further includes:
and carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
In the embodiment of the invention, the detection device of the fault detection device installation node is firstly subjected to time synchronization processing and communication testing to ensure that the time synchronization and the communication among all the detection devices are normal, and then the detection device is used for detecting the traveling wave voltage data on the overhead line.
Step S204, establishing a fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data;
in an optional embodiment, the traveling wave voltage data includes arrival time of a fault traveling wave voltage signal collected by the detection device; establishing a fault location equation based on the traveling wave voltage time and the traveling wave voltage data, comprising:
setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and establishing the fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data and by combining the parameters.
In the embodiment of the invention, the traveling wave voltage time and the fault traveling wave voltage signal arrival time are set as parameters of the fault location equation, and the fault location equation is established by combining the traveling wave voltage data.
In specific implementation, please refer to fig. 5, fig. 5 is a schematic diagram illustrating a principle of establishing a fault location equation in a fault location method according to the present invention. Firstly, dividing an overhead line into L sections, marking corresponding starting point and end point positions on each section of line, and calculating the time required for the traveling wave voltage to propagate from the starting point to the end point on each section of line, wherein the traveling wave propagation time corresponding to a line L is T for examplel. When the installation node position of the detection device is fixed, the time for the fault traveling wave voltage to propagate from the starting point of a section of line to the installation position of the detection device can be obtained. For example, the traveling fault wave voltage is propagated from the starting point of the line l to the detection device 1 and the detection device 2 at times Tl，1And Tl，2. Assuming that a fault occurs on line l, the time required for the traveling wave voltage of the fault to propagate to the beginning of line l is αlTl。αlThe coefficient, which is the distance between the location where the fault occurred and the line starting point, has a value ranging from 0 to 1. From this, it can be concluded that the slave failureThe traveling wave voltage propagation time of the fault from the point to the detection device 1 and the detection device 2 is respectively as follows: t isl，1+S1，lαlTlAnd Tl，2+S2，lαlTl. Wherein S is1，lAnd S2，lIs +1 or-1 depending on whether the shorter distance of the path from the start point of the line l to the detection means passes the end point of the line l, if not +1, otherwise-1. When the line l has a fault, the detection device 1 and the detection device 2 can detect and calculate that the arrival time of the fault traveling wave voltage is T respectively1And T2Thus, the following formula can be obtained.
T1-T2 = (Tl，1- Tl，2)+ αlTl (S1，l-S2，l)
Assuming that the number of installed detection devices is N, L sets of fault localization equations can be established, where the fault localization equations established for line L are as follows.
ΔT-ΔTl–αlTlΔS = 0；
Wherein Δ T =
，Ti = min (T1，T2，……，TN )；
ΔTl =
，Tj = min (Tl，1，Tl，2，……，Tl，N )；
ΔS =
，Si= min (Sl，1，Sl，2，……，Sl，N )；
Wherein j is a code number corresponding to the detection device, and the value range is 1-N.
In the established fault location equation, Δ Tl、TlAnd Δ S are eachBefore a fault occurs, the fault is calculated according to the topology of the installation node of the detection device, and the delta T can be calculated according to the arrival time of fault traveling wave voltage after the fault occurs. When the fault location equation is solved, in order to reduce the calculation time and realize quick and accurate location, the solving step is divided into two steps. First, using the euclidean vector norm, the optimal constraint is given by:
min ||{l，-α}ΔT- ΔTl -αlTlΔS||
wherein alpha isl ϵ [0-1]- l ϵ {1，2，……，L}。
Applying a first order optimality condition to each of the L lines, wherein the calculated optimal alpha of line LlThe values are given below:
subsequently, the optimal constraint resulting for the Euclidean vector norm is substituted into α as found by the above equationlThe value is obtained, the corresponding optimal line l when the value is the minimum value is solved, and the optimal line l and the optimal alpha are calculatedlThe combination of the values can obtain that the fault occurs on the section of the line l and the distance from the starting point is alpha of the length of the line llAnd (4) doubling.
And writing by using a fault positioning algorithm in a C language. When the algorithm is executed, whether the topology of the installation node of the detection device is updated or not is checked, and if the topology is updated, the traveling wave voltage time in the topology needs to be updated. Before the traveling wave voltage detection is carried out, firstly, the time reference of each detection node detection device needs to be accurately synchronized, whether the communication is normal or not is checked, and then the cloud computing processing unit informs each detection device to detect the fault traveling wave voltage and establishes a fault positioning equation. And the cloud computing processing unit is used for rapidly solving the fault positioning equation and obtaining an accurate positioning result.
Step S205, calculating to obtain line fault position information according to the Euclidean standard vector norm and a first-order optimality condition by combining the fault positioning equation;
in the embodiment of the invention, a fault positioning equation is solved by utilizing the norm of the Euclidean standard vector and a first-order optimality condition, so as to obtain the line fault position information.
In specific implementation, please refer to fig. 6, and fig. 6 is a schematic diagram illustrating an application of the fault location method in a power grid system according to the present invention. When the device is used, the detection device is installed at the existing equipment such as a switch of a circuit, and the topological structure formed by the installation node positions of all the detection devices is recorded. The cloud computing processing unit issues a fault detection command, and the detection devices at the nodes respectively detect fault traveling wave voltage signals at the nodes in a non-contact mode and upload traveling wave voltage arrival time and corresponding fault information to the cloud computing processing unit. The cloud computing processing unit synthesizes fault information uploaded by each detection node and traveling wave voltage time of the detection device installation node topology to establish a fault positioning equation, and accurately positions faults of the overhead line.
In the fault location method provided by the embodiment of the invention, the historical topology information and the real-time topology information of the installation node of the fault detection device are obtained, whether the historical topology information and the real-time topology information are the same or not is matched, if not, the traveling wave voltage time in the real-time topology information is recalculated and updated, the traveling wave voltage data on the overhead line is detected, the line fault location is located by combining Euclidean standard vector norm and a first-order optimality condition based on the traveling wave voltage time and the traveling wave voltage data, and the line fault location information is obtained, through the fault location method, the technical problem that the existing method can change the topology and stability of the original system when the overhead line fault is detected through a synchronous detection device at present is solved, and the non-contact detection and location of the overhead line fault are realized, the reliability and the stability of the power grid are improved.
Referring to fig. 7, fig. 7 is a block diagram of a fault location device according to an embodiment of the present invention, including:
an obtaining module 701, configured to obtain historical topology information and real-time topology information of a fault detection apparatus installation node;
an updating module 702, configured to match whether the historical topology information and the real-time topology information are the same; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
the detection module 703 is configured to detect traveling wave voltage data on the overhead line;
and the positioning module 704 is configured to position the line fault location based on the traveling wave voltage time and the traveling wave voltage data, in combination with an euclidean standard vector norm and a first-order optimality condition, to obtain line fault location information.
In an optional embodiment, the apparatus further comprises:
and the synchronization module is used for carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
In an alternative embodiment, the positioning module 704 includes:
the establishing submodule is used for establishing a fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data;
and the positioning submodule is used for calculating to obtain the line fault position information by combining the fault positioning equation according to the Euclidean standard vector norm and the first-order optimality condition.
In an optional embodiment, the traveling wave voltage data includes arrival time of a fault traveling wave voltage signal collected by the detection device; the establishing submodule comprises:
the parameter unit is used for setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and the establishing unit is used for establishing the fault positioning equation by combining the parameters based on the traveling wave voltage time and the traveling wave voltage data.
An embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the fault location method according to any of the above embodiments.
The embodiment of the present invention further provides a computer storage medium, on which a computer program is stored, where the computer program, when executed by the processor, implements the steps of the fault location method according to any of the above embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the method, apparatus, electronic device and storage medium disclosed in the present application may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned readable storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of fault location, comprising:
acquiring historical topology information and real-time topology information of a fault detection device installation node;
matching whether the historical topology information and the real-time topology information are the same; if not, recalculating and updating the traveling wave voltage time in the real-time topological information;
detecting traveling wave voltage data on the overhead line;
and positioning the line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information.
2. The method of claim 1, wherein prior to detecting traveling wave voltage data on the overhead line, further comprising:
and carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
3. The method of claim 1, wherein the step of locating the line fault location based on the traveling wave voltage time and the traveling wave voltage data in combination with a euclidean norm and a first-order optimality condition to obtain the line fault location information comprises:
establishing a fault location equation based on the traveling wave voltage time and the traveling wave voltage data;
and calculating to obtain the line fault position information by combining the fault positioning equation according to the Euclidean standard vector norm and the first-order optimality condition.
4. The fault location method of claim 3, wherein the traveling wave voltage data comprises a fault traveling wave voltage signal arrival time collected by the detection device; establishing a fault location equation based on the traveling wave voltage time and the traveling wave voltage data, comprising:
setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and establishing the fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data and by combining the parameters.
5. A fault locating device, comprising:
the acquisition module is used for acquiring historical topology information and real-time topology information of the installation node of the fault detection device;
the updating module is used for matching whether the historical topology information is the same as the real-time topology information; if not, recalculating and updating the traveling wave voltage time in the real-time topology information;
the detection module is used for detecting traveling wave voltage data on the overhead line;
and the positioning module is used for positioning the line fault position based on the traveling wave voltage time and the traveling wave voltage data by combining Euclidean standard vector norm and a first-order optimality condition to obtain line fault position information.
6. The fault locating device of claim 5, wherein the device further comprises:
and the synchronization module is used for carrying out time synchronization processing and communication testing on the detection device of the fault detection device installation node.
7. The fault locating device of claim 5, wherein the locating module comprises:
the establishing submodule is used for establishing a fault positioning equation based on the traveling wave voltage time and the traveling wave voltage data;
and the positioning submodule is used for calculating to obtain the line fault position information by combining the fault positioning equation according to the Euclidean standard vector norm and the first-order optimality condition.
8. The fault locating device of claim 7, wherein the traveling wave voltage data includes a fault traveling wave voltage signal arrival time collected by the detection device; the establishing submodule comprises:
the parameter unit is used for setting the traveling wave voltage time and the fault traveling wave voltage signal arrival time as parameters of the fault positioning equation;
and the establishing unit is used for establishing the fault positioning equation by combining the parameters based on the traveling wave voltage time and the traveling wave voltage data.
9. An electronic device comprising a processor and a memory storing computer readable instructions that, when executed by the processor, perform the method of any one of claims 1-4.
10. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the method according to any of claims 1-4.
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