Electronic primary and secondary fusion device and method
By designing an electronic primary and secondary fusion device in the medium voltage distribution network, and using the medium voltage carrier communication system to achieve topological identification and distributed fault analysis, the problem of low fault diagnosis and processing efficiency of the medium voltage distribution network is solved, rapid fault diagnosis and processing is achieved, and line patrol costs are reduced.
Patent Information
- Application Number
- CN202411758907.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-02-28
AI Technical Summary
The fault diagnosis and treatment of existing medium voltage distribution network feeder lines have problems such as long failure removal time, large fault isolation interval, high line patrol costs, and complex installation procedures for separate installation of PT and circuit breakers.
An electronic primary and secondary fusion device is designed to integrate a medium ballast carrier communication system and a fusion FTU, and topological identification and distributed fault analysis are realized through medium ballast carrier waves, with traveling wave ranging function, shortening the fault self-healing time.
It realizes rapid fault diagnosis and processing of medium-voltage distribution networks, shortens fault self-healing time, reduces line patrol costs, and improves feeder fault diagnosis capabilities and automated fault handling levels.
Smart Images
Figure CN119543445A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of primary and secondary fusion in the electric power industry, and specifically relates to an electronic primary and secondary fusion device and method. Background Art
[0002] In recent years, distribution automation has developed rapidly, and more and more primary and secondary integrated intelligent switches have been adopted, which is the trend of intelligent distribution network construction. The primary and secondary integrated intelligent switches of distribution network optimize the coordination between primary and secondary equipment and reduce the on-site workload of installation and operation and maintenance personnel.
[0003] Automation is the main feature of smart grids, and the main content of medium-voltage system automation is distribution automation. The main contents of distribution automation include substation automation and feeder automation. Substation automation involves fewer devices, simple communication, relatively centralized, and high reliability. It is now possible to realize intelligent unmanned substations. However, feeder automation involves a large number of devices, the communication method varies according to the specific conditions of the line, and the radial dispersion and long distance. Due to insufficient understanding and insufficient attention to feeder fault diagnosis, regional isolation and power supply restoration, the problem of low reliability of medium-voltage distribution network feeders has always existed.
[0004] When a line fails, a large number of operation and maintenance personnel are required to patrol the line to find the fault point and deal with it. The distribution network lines cover many mountainous areas and the line radius is long, which leads to a significant increase in line patrol costs, and the types of faults vary greatly. Even with the assistance of drones in line patrol, there are still problems such as long fault removal time and large fault isolation interval. In addition, the separate installation process of PT (Potential Transformer) and circuit breaker is complicated and difficult to construct, which is also a major problem that needs to be solved. Traditional primary and secondary electronic fusion equipment cannot achieve real-time topology identification, and the distributed FA (i.e. distributed fault analysis) uses optical fiber, which is costly and has a large latency when using 5G. Summary of the invention
[0005] In view of the various shortcomings of the prior art, the inventors have researched and designed an electronic primary-secondary fusion device and method in long-term practice. The medium-voltage carrier communication system is integrated into the fused FTU (Field Termination Unit), and topology identification and distributed FA functions are realized through the medium-voltage carrier.
[0006] The present invention provides an electronic primary and secondary fusion device, including a fused pole-mounted circuit breaker and a fused FTU. The fused FTU includes an FTU basic function module, a 10kV power line carrier module and a topology identification module; the fused pole-mounted circuit breaker includes a carrier coupler, a capacitor energy source and an electronic PT. An electronic PT and a coupler are provided in each pole of the fused pole-mounted circuit breaker, and the couplers and electronic PTs between any two poles are internally connected.
[0007] Furthermore, the 10kV power line carrier module includes a carrier main control module and a carrier machine part.
[0008] Furthermore, the carrier machine part includes a carrier part sending module and a carrier part receiving module.
[0009] Furthermore, the FTU basic function module and the carrier main control module share a main control chip and the same network port; the carrier part sending module and the carrier part receiving module share a chip; and the electronic PT is provided with a carrier sending chip.
[0010] The method for performing image model verification using the device of the present invention comprises the following steps:
[0011] Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived.
[0012] Step 2: The carrier master control module of the fused FTU sequentially controls the switching modules in the carrier machine part of other fused FTUs to send out low-frequency signals as needed.
[0013] Step 3: The low-frequency signal will be transmitted along the 10kV line in the direction opposite to the power supply current. Other fusion FTUs detect the low-frequency signal and record it.
[0014] Step 4: The carrier master control module of the fusion FTU collects and counts the reception status of the low-frequency signal by other fusion FTUs through carrier communication.
[0015] Step 5: After sending and receiving low-frequency signals for many times, the carrier master control module draws the line topology information based on the statistical data and reports it to the master station.
[0016] The method for performing distributed FA using the device of the present invention comprises the following steps:
[0017] Step 1: After the FTU detects a fault, it will communicate with the carrier machine through the network port and transmit the fault information to the carrier machine.
[0018] Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic. The carrier machine autonomously asks its neighboring nodes whether a fault is detected, and combines its own fault information to form a distributed FA operation result.
[0019] Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU.
[0020] Step 4: The fusion FTU decides whether the conditions for opening and closing operations are met. If the conditions for opening and closing operations are met, the circuit breaker is controlled by the aviation plug line to perform operations; if the conditions for opening and closing operations are not met, no processing is performed.
[0021] Step 5: All FA information of the fused FTU is transmitted to the carrier machine in real time.
[0022] Step 6: After FA is completed, the carrier master control module collects all FA-related fusion FTU information on the line and reports all FA information to the master station. The master station performs fault display and fault inversion based on the FA information.
[0023] The method for accurate positioning using the device of the present invention comprises the following steps:
[0024] Step 1: The fusion FTU detects a fault and transmits the fault information to the carrier machine part, while performing power frequency recording.
[0025] Step 2: After receiving the fault information, the carrier machine starts the distributed FA logic and turns on the traveling wave recording function to record the fault waveform and calculate the wave head data.
[0026] Step 3: The wave head data, traveling wave waveform and power frequency recording file are reported to the main station through the 4G module of the fusion FTU.
[0027] Step 4: The master station conducts fault analysis based on the reported data and waveform files to obtain the exact location of the fault.
[0028] Furthermore, for a short-circuit fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information; for a grounding fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected grounding fault.
[0029] The beneficial effects of the present invention are:
[0030] The medium-voltage carrier communication system is integrated into the fused FTU, and topology identification and distributed FA functions are realized through the medium-voltage carrier, which shortens the fault self-healing time and provides support for the construction of distribution automation. At the same time, it has the function of traveling wave ranging, which shortens the line patrol cost, improves the feeder fault diagnosis capability, and enhances the level of feeder automation fault handling. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a design principle block diagram of the electronic primary and secondary fusion device of the present invention;
[0032] Figure 2 It is a schematic diagram of the FTU, carrier master control, carrier machine chip and interaction of the present invention;
[0033] Figure 3 It is the logical block diagram of the image model verification of the present invention;
[0034] Figure 4 is a distributed FA logic block diagram of the present invention;
[0035] Figure 5 It is the precise positioning logic block diagram of the present invention. DETAILED DESCRIPTION
[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. These implementation examples are described in sufficient detail so that those skilled in the art can understand and practice the present invention. Without departing from the spirit and scope of the present invention, logical, achievable and other changes may be made to the implementation. Therefore, the following detailed description should not be construed as limiting, and the scope of the present invention is limited only by the claims.
[0037] See also Figure 1 The electronic primary and secondary fusion device of the present invention includes a fused pole-mounted circuit breaker and a fused FTU. The fused FTU includes a complete FTU basic function module, a 10kV power line carrier module and a topology identification module. The 10kV power line carrier module includes a carrier main control module and a carrier machine part, and the carrier machine part includes a carrier part sending module and a carrier part receiving module.
[0038] The fusion type pole mounted circuit breaker includes a carrier coupler, capacitor energy extraction and an electronic PT. The fusion type pole mounted circuit breaker has the carrier feeding network sending function and carrier receiving drive.
[0039] An electronic PT and a coupler are installed in each column of the fusion type pole-mounted circuit breaker, and the couplers and electronic PTs between any two columns are connected internally. Even if the circuit breaker is in the open state, the connectivity of the carrier transmission at both ends of the fusion type pole-mounted circuit breaker can be guaranteed.
[0040] See also Figure 2In the fusion FTU, the complete FTU basic function module and the carrier main control module share a main control chip (i.e., chip 1) and the same network port. The carrier part sending module and the carrier part receiving module use a separate chip (i.e., chip 2). The electronic PT has a carrier transmission chip (i.e., chip 3), which transmits the carrier signal to the fusion pole-mounted circuit breaker through the signal line. The fusion pole-mounted circuit breaker combines the electronic PT with the carrier coupler and feeds the received carrier signal to the 10kV line.
[0041] See also Figure 3 , use the electronic primary and secondary fusion device of the present invention to perform image model verification, the specific method is as follows:
[0042] Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived.
[0043] Step 2: The carrier master control of the fused FTU can control the switching modules in the carrier machine part of other fused FTUs in turn to send out low-frequency signals as needed.
[0044] Step 3: The low frequency signal will be transmitted along the 10kV line in the opposite direction of the supply current. Other fusion FTUs will detect the low frequency signal and record it.
[0045] Step 4: The carrier master control of the fusion FTU will collect and count the reception status of the low-frequency signal by other fusion FTUs through carrier communication.
[0046] Step 5: After sending and receiving low-frequency signals for many times, the carrier master controller draws the line topology information based on the statistical data and reports it to the master station to realize the topology identification function.
[0047] See also Figure 4 , using the electronic primary and secondary fusion device of the present invention to perform distributed FA, the fusion FTU has the ability to detect short circuit and ground faults, the specific method is as follows:
[0048] Step 1: After the FTU detects a fault, it will communicate with the carrier machine through the network port and transmit the fault information to the carrier machine.
[0049] Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic. The carrier machine will autonomously ask its neighboring nodes whether a fault is detected, and combine its own fault information to form a distributed FA operation result.
[0050] Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU.
[0051] Step 4: The fusion FTU decides whether the conditions for opening and closing are met. If the conditions are met, the circuit breaker will be controlled by the aviation plug line to perform the action. If the conditions are not met, no action will be taken.
[0052] Step 5: All FA information of the fused FTU is transmitted to the carrier machine in real time.
[0053] Step 6: After FA is completed, the carrier master will collect all FA-related fusion FTU information on the line and report all FA information to the master station, which can display and reverse the fault according to the FA information. This will achieve rapid isolation of the fault and restoration of power supply to the non-fault area, thus realizing the distributed FA function.
[0054] See also Figure 5 , use the electronic primary and secondary fusion device of the present invention to perform precise positioning, the specific method is as follows:
[0055] Step 1: The fusion FTU detects a fault, transmits the fault information to the carrier part, and performs power frequency recording at the same time. The fusion FTU reports the fault SOE to the main station through the 4G module.
[0056] Step 2: After the carrier machine receives the fault information, it starts the distributed FA logic and turns on the traveling wave recording function to record the fault waveform and calculate the wave head data.
[0057] Step 3: The wave head data, traveling wave waveform and power frequency recording file will be reported to the main station through the 4G module of the fusion FTU.
[0058] Step 4: The master station conducts fault analysis based on the reported data and waveform files to obtain the exact location of the fault, thereby achieving precise fault location.
[0059] For short-circuit faults, the condition for the downstream nodes of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information. For ground faults, the condition for the downstream nodes of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected ground fault.
[0060] The present invention develops a new type of power distribution terminal device based on a primary fusion device. The device of the present invention has a medium-voltage carrier communication function to provide communication support for the business; it has a topology identification function to provide a topology basis for the protection business; it has a traveling wave ranging function to reduce the line patrol cost; it has a distributed FA function based on medium-voltage carrier communication to shorten the fault self-healing time and provide support for the construction of distribution automation.
[0061] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".
Claims
1. An electronic primary and secondary fusion device, characterized in that: It includes a fused pole-mounted circuit breaker and a fused FTU; the fused FTU includes an FTU basic function module, a 10kV power line carrier module and a topology identification module; the fused pole-mounted circuit breaker includes a carrier coupler, capacitor energy extraction and an electronic PT; an electronic PT and a coupler are provided in each pole of the fused pole-mounted circuit breaker, and the couplers and electronic PTs between any two poles are internally connected.
2. The electronic primary and secondary fusion device according to claim 1, characterized in that: The 10kV power line carrier module includes a carrier main control module and a carrier machine part.
3. An electronic primary and secondary fusion device and method according to claim 2, characterized in that: The carrier machine part includes a carrier part sending module and a carrier part receiving module.
4. The electronic primary and secondary fusion device and method according to claim 3, characterized in that: The FTU basic function module and the carrier main control module share a main control chip and the same network port; the carrier part sending module and the carrier part receiving module share a chip; and the electronic PT is provided with a carrier sending chip.
5. A method for image model verification using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived; Step 2: The carrier master control module of the fusion FTU controls the switching modules in the carrier machine part of other fusion FTUs in turn to send low-frequency signals as needed; Step 3: The low-frequency signal will be transmitted along the 10kV line in the direction opposite to the power supply current. Other fusion FTUs detect the low-frequency signal and record it. Step 4: The carrier master control module of the fusion FTU collects and counts the reception status of the low-frequency signal by other fusion FTUs through carrier communication; Step 5: After sending and receiving low-frequency signals for many times, the carrier master control module draws the line topology information based on the statistical data and reports it to the master station.
6. A method for performing distributed FA using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: After the FTU detects a fault, it will communicate with the carrier machine through the network port and transmit the fault information to the carrier machine; Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic. The carrier machine autonomously asks its neighboring nodes whether a fault is detected, and combines its own fault information to form a distributed FA operation result. Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU; Step 4: The fusion FTU decides whether the conditions for opening and closing operations are met; if the conditions for opening and closing operations are met, the circuit breaker is controlled by the aviation plug line to perform operations; if the conditions for opening and closing operations are not met, no processing is performed; Step 5: All FA information of the fused FTU is transmitted to the carrier in real time; Step 6: After FA is completed, the carrier master control module collects all FA-related fusion FTU information on the line and reports all FA information to the master station. The master station performs fault display and fault inversion based on the FA information.
7. A method for accurate positioning using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: The fusion FTU detects the fault and transmits the fault information to the carrier machine part, while performing power frequency recording; Step 2: After receiving the fault information, the carrier machine starts the distributed FA logic and starts the traveling wave recording function to record the fault waveform and calculate the wave head data; Step 3: The wave head data, traveling wave waveform and power frequency recording file are reported to the main station through the 4G module of the fusion FTU; Step 4: The master station conducts fault analysis based on the reported data and waveform files to obtain the exact location of the fault.
8. The method according to claim 7, characterized in that For a short-circuit fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information; for a grounding fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected grounding fault.