CN113156265A - Fault detection method and system for batch transfer of feeder lines of power distribution network - Google Patents
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- 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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Abstract
The invention discloses a fault detection method and a system for batch transfer of feeder lines of a power distribution network, wherein the fault detection method comprises the following steps: acquiring FTU fault information according to the real-time monitored running state information of the power distribution network, and topologically calculating the fault information to obtain a fault area; based on the fault area, issuing a command to a related feeder terminal FTU to execute switch opening operation to isolate faults according to a real-time topological structure of the power distribution network; and according to a reconstruction scheme automatically provided by a computer or a scheme pre-written by maintenance personnel based on a corresponding loop and a fault position, recovering the power supply of a non-fault area and realizing the reconstruction of the power distribution network to finish fault detection. The invention has accurate fault detection, can not only judge the amplitude of the fault current, but also detect the duration of the fault, and can quickly judge whether the fault is a permanent fault or a transient fault, thereby quickly and accurately finding the area where the fault is positioned.
Description
Technical Field
The invention relates to the technical field of distribution network automation, in particular to a fault detection method and system for batch transfer of feeder lines of a distribution network.
Background
Distribution network automation is an important means for improving the operation level and the management level of a distribution network and reducing loss; the research on distribution automation in China starts late, but develops quickly, since the late 90 s, many cities in China try distribution automation work in different areas on different scales, and many urban power grids successively establish distribution automation systems and accumulate a lot of experience and training.
With the large scale of the equipment governed by the regional power grid, the number of substations under all levels of voltage and the number of lines for power distribution and transformation are increased, the real-time control system of the power grid is more and more complex, and more distribution lines are used for supplying power to customers as the number of the regional substations is increased.
In the construction of a daily power grid, a main network operation line and equipment need to be powered off, and a transformer substation and a line are continuously added while economic development is achieved, so that more loads are connected; moreover, a large amount of power grid operation equipment also needs to be subjected to power failure maintenance work regularly to ensure reliable power supply for customers; the maintenance work of these major network lines, part can cause the power failure to the relatively weak transformer substation of electric wire netting operation mode or generating line, even need not have the power failure also can appear accident power failure risk.
When the power grid line equipment is suddenly damaged due to a fault, or severe weather such as typhoon and strong thunderstorm occurs in an area, the main network operation line or the equipment can be failed and power failure can be caused, and one to a plurality of transformer substations and bus accident power failure events can also be caused. Generally, tens of power distribution network feeders of a transformer substation in normal operation of a power grid supply power to customers, if a regional large-range power failure accident happens, hundreds of power distribution network feeders can be caused to have power failure at the same time, and once the accident of power failure occurs, a failure occurrence area needs to be found in the first time, and then emergency repair of the accident is carried out to keep power supply of the power distribution network.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the technical problem solved by the invention is as follows: the power supply safety and reliability are low, a comprehensive power failure accident is easy to happen, and a fault area cannot be judged quickly.
In order to solve the technical problems, the invention provides the following technical scheme: acquiring FTU fault information according to the real-time monitored running state information of the power distribution network, and topologically calculating the fault information to obtain a fault area; based on the fault area, issuing a command to a related feeder terminal FTU to execute switch opening operation to isolate faults according to a real-time topological structure of the power distribution network; and according to a reconstruction scheme automatically provided by a computer or a scheme pre-written by maintenance personnel based on a corresponding loop and a fault position, recovering the power supply of a non-fault area and realizing the reconstruction of the power distribution network to finish fault detection.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the real-time state information of the power distribution network comprises analog quantity and state quantity.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the analog quantities include active power, reactive power, apparent power, voltage, current, and frequency.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the state quantity comprises position signals of the circuit breaker and the switch blade, accident total signals, early warning signals, protection signals and fault signals.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the fault information judgment comprises that if the switch is successfully reclosed, the fault information is defined as an instantaneous fault; and if the reclosing is unsuccessful, defining the permanent fault.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the fault point isolation process comprises the steps of searching load switches around the fault area according to a fault positioning result, carrying out remote control operation according to the actual running state and parameters of equipment, and pulling all the switches in the closed positions.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: and the fault area positioning comprises the step of quickly and accurately positioning the fault area through the topological structure of the power distribution network by combining telemetering data on the switch according to fault current marks on each load switch sent by the FTU based on the permanent fault on the feeder line.
As an optimal scheme of the fault detection method for batch transfer of the feeder line of the power distribution network, the method comprises the following steps: the telemetering data comprises current, voltage, power, switch on-off state and fault signs on the feeder line.
In order to solve the technical problem, the invention also provides a fault detection system for batch transfer of the feeder lines of the power distribution network, and the technical scheme is as follows: the master station module comprises a data acquisition and processing module, a remote control module, a warning module and a data storage module, and is used for overall fault processing and centralized management of fault parameters of the power distribution network; the substation module is connected with the main station module and is used for processing the local fault of the whole radiation center; the distribution terminal module is connected with the main station module and the substation module and comprises a feeder terminal unit FTU, a distribution transformer terminal unit TIU and a switching station terminal unit DTU for detecting basic faults; the master station module and the substation module respectively comprise a fault monitoring and identifying module and a fault positioning module.
As an optimal scheme of the fault detection system for batch supply of the feeder lines of the power distribution network, the invention comprises the following steps: the remote control module is used for the master station module or the substation module to remotely control the power distribution terminal module; the data acquisition and processing module uploads the data on the automation device to the master station module and stores the data in the data storage module; and the fault monitoring module is used for remotely monitoring the current, the voltage, the power, the switch opening and closing state and the fault mark on the feeder line in real time under the normal condition.
The invention has the beneficial effects that: the fault detection is accurate, the amplitude of the fault current can be judged, meanwhile, the duration time of the fault can be detected, and the permanent fault or the transient fault can be rapidly judged, so that the region where the fault is located can be rapidly and accurately found.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a basic flow diagram of a fault detection method for batch delivery of feeder lines of a distribution network according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or 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.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a fault detection method for batch transfer of feeder lines of a power distribution network, including:
s1: acquiring FTU fault information according to the real-time monitored running state information of the power distribution network, and performing topological calculation on the fault information to obtain a fault area;
it should be noted that the real-time status information of the power distribution network includes an analog quantity and a state quantity.
Wherein the analog quantity comprises active power, reactive power, apparent power, voltage, current and frequency;
the state quantity comprises position signals of the circuit breaker and the switch blade, accident total signals, early warning signals, protection signals and fault signals.
Further, the fault information judgment includes that if the switch reclosing is successful, the fault is defined as an instantaneous fault; and if the reclosing is unsuccessful, defining the permanent fault.
Specifically, the master station layer or the substation layer can detect fault current based on the FTU in the upstream area of the power supply of the fault point through the collected FTU fault information, the FTU in the downstream area of the power supply of the fault point cannot detect the fault current, and the fault area is determined according to the topology calculation information.
The method comprises the steps that a main station system monitors telemetering information such as current, voltage and power on a feeder line and telemetering information such as switch opening and closing states and fault marks in a non-fault situation in a remote real-time mode, when a switch of a certain loop is in an accident, a main station layer waits for reclosing of the switch, if the reclosing is successful, a transient fault is considered, a corresponding feeder line fault processing function is not started, if the reclosing is unsuccessful, a permanent fault is considered, the feeder line fault processing function is started, and after the main station layer determines that the permanent fault occurs on the feeder line, the main station layer combines the telemetering data on the switch according to the fault current marks on each load switch sent on an FTU and finally locates a fault area rapidly and accurately through a topological structure of a power distribution network.
S2: based on the fault area, issuing a command to a related feeder terminal FTU to execute switch opening operation to isolate faults according to a real-time topological structure of the power distribution network;
it should be noted that, the fault point isolation process includes,
and searching load switches around the fault area according to the fault positioning result, and performing remote control operation according to the actual running state and parameters of the equipment to pull all the switches at the closed positions.
Further, the location of the fault area includes,
based on the permanent fault on the feeder line, the fault area is quickly and accurately positioned through the topological structure of the power distribution network by combining the telemetering data on the switch according to the fault current mark on each load switch sent by the FTU.
Specifically, after the fault area is determined, the feeder terminal unit FTU uploads information to the master station layer or the slave station layer through the data acquisition and processing module, and the master station layer or the slave station layer issues a command to the relevant feeder terminal unit FTU to execute switching-off operation to isolate the fault according to the real-time topology structure of the distribution network.
The telemetering data comprises current, voltage, power, switch on-off state and fault marks on the feeder line.
When the fault area exceeds the area governed by the power distribution substation layer or the isolation is unsuccessful, the substation layer reports accident information to the main station layer, the main station layer coordinates each substation layer, and automatic or manual isolation is implemented according to the principle of minimum line loss or the principle of minimum switching action times according to the operation condition of the power distribution network, the condition of a standby power supply and the load condition of a relevant transformer and a line.
S3: according to a reconstruction scheme automatically provided by a computer or a scheme pre-written by maintenance personnel based on a corresponding loop and a fault position, recovering power supply of a non-fault area and realizing reconstruction of a power distribution network to finish fault detection;
the power distribution network fault reconstruction scheme comprises the following steps: and based on the obtained power distribution network fault information, positioning and isolating the obtained fault, and recovering power supply to the non-fault area.
In order to verify the technical effects adopted in the method, the embodiment adopts the traditional technical scheme and the method of the invention to carry out comparison test, and compares the test results by means of scientific demonstration to verify the real effect of the method.
The traditional technical scheme is as follows: in order to verify that the method has higher real-time performance and accuracy compared with the traditional method, the method adopts the traditional expert system and the method to respectively carry out real-time measurement comparison on the time and the accuracy of the fault diagnosis of the power distribution network, different power distribution network fault data are simulated on a simulation platform, simulation tests of the method are realized based on MATLB software programming, the simulation data are obtained according to experimental results, 10 groups of data are tested in each method, the average value of each group of data is obtained by calculation, and the results are shown in the following table:
table 1: experimental data are shown in a comparison table.
| Comparison sample | Conventional methods | The method of the invention |
| Rate of accuracy | 82％ | 96％ |
| Time | 35s | 5s |
From the above table, the fault detection accuracy of the method is much higher than that of the conventional method, the time for acquiring the fault position is much shorter than that of the conventional technical scheme, and the real-time performance of the method is reflected.
Example 2
This embodiment differs from the first embodiment in that a fault detection system for bulk re-provisioning of distribution network feeders is provided, comprising:
the master station module comprises a data acquisition processing module, a remote control module, a warning module and a data storage module, and is used for overall fault processing and centralized management of fault parameters of the power distribution network;
the substation module is connected with the main station module and is used for processing the local fault of the whole radiation center;
the distribution terminal module is connected with the main station module and the substation module and comprises a feeder terminal unit FTU, a distribution transformer terminal unit TIU and a switching station terminal unit DTU for detecting basic faults;
the master station module and the substation module respectively comprise a fault monitoring and identifying module and a fault positioning module, and the master station module collects signals of the power distribution terminal and the substation module in real time.
Specifically, the remote control module is used for the master station module or the substation module to remotely control the power distribution terminal module;
the data acquisition and processing module uploads the data on the automation device to the master station module and stores the data in the data storage module;
and the fault monitoring module is used for remotely monitoring the current, the voltage, the power, the switch opening and closing state and the fault mark on the feeder line in real time under the normal condition.
The distribution terminal module collects data of various devices on the distribution network, including state quantities and fault signals, transmits the data to the substation module, the substation module collects the data and transmits the data to the main station module, receives a command of the main station module, sends various control operations to the distribution network device, mainly completes monitoring of feeder faults, reports a fault detection structure and processing information to the substation module or the main station module, receives a control command of the main station module, and is responsible for fault detection and fault processing execution in fault processing.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A fault detection method for batch transfer of feeder lines of a power distribution network is characterized by comprising the following steps:
acquiring FTU fault information according to the real-time monitored running state information of the power distribution network, and topologically calculating the fault information to obtain a fault area;
based on the fault area, issuing a command to a related feeder terminal FTU to execute switch opening operation to isolate faults according to a real-time topological structure of the power distribution network;
and according to a reconstruction scheme automatically provided by a computer or a scheme pre-written by maintenance personnel based on a corresponding loop and a fault position, recovering the power supply of a non-fault area and realizing the reconstruction of the power distribution network to finish fault detection.
2. The method of fault detection of bulk transfers of feeder lines over a distribution network of claim 1, wherein: the real-time state information of the power distribution network comprises analog quantity and state quantity.
3. A method of fault detection of a bulk transfer of feeder lines to a distribution network as claimed in claim 1 or 2, wherein: the analog quantities include active power, reactive power, apparent power, voltage, current, and frequency.
4. A method of fault detection of a batch switch of feeder lines over a distribution network as claimed in claim 3, wherein: the state quantity comprises position signals of the circuit breaker and the switch blade, accident total signals, early warning signals, protection signals and fault signals.
5. The method of fault detection of bulk transfers of feeder lines over a distribution network of claim 1, wherein: the failure information judgment includes that the failure information judgment includes,
if the switch is successfully reclosed, defining the switch as a transient fault;
and if the reclosing is unsuccessful, defining the permanent fault.
6. The method of fault detection of bulk transfers of feeder lines over a distribution network of claim 5, wherein: the fault point isolation procedure includes the steps of,
and searching load switches around the fault area according to the fault positioning result, and performing remote control operation according to the actual running state and parameters of the equipment to pull all the switches at the closed positions.
7. A fault detection method for batch re-supply of feeder lines of a distribution network as claimed in claim 1 or 6, wherein: the location of the fault region includes,
based on the permanent fault on the feeder line, according to the fault current mark on each load switch sent on the FTU, and in combination with the telemetering data on the switch, the fault area is quickly and accurately positioned through the topological structure of the power distribution network.
8. The method of fault detection of bulk transfers of feeder lines over a distribution network of claim 7, wherein: the telemetering data comprises current, voltage, power, switch on-off state and fault signs on the feeder line.
9. A fault detection system for batch transfer of feeder lines of a power distribution network is characterized by comprising:
the master station module comprises a data acquisition and processing module, a remote control module, a warning module and a data storage module, and is used for overall fault processing and centralized management of fault parameters of the power distribution network;
the substation module is connected with the main station module and is used for processing the local fault of the whole radiation center;
the distribution terminal module is connected with the main station module and the substation module and comprises a feeder terminal unit FTU, a distribution transformer terminal unit TIU and a switching station terminal unit DTU for detecting basic faults;
the master station module and the substation module respectively comprise a fault monitoring and identifying module and a fault positioning module.
10. A fault detection system for bulk transfers of feeder lines over a distribution network as claimed in claim 9, wherein:
the remote control module is used for the master station module or the substation module to remotely control the power distribution terminal module;
the data acquisition and processing module uploads the data on the automation device to the master station module and stores the data in the data storage module;
and the fault monitoring module is used for remotely monitoring the current, the voltage, the power, the switch opening and closing state and the fault mark on the feeder line in real time under the normal condition.
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