Urban power distribution network fault diagnosis system and method

Abstract

The invention relates to the technical field of power grid fault diagnosis, in particular to an urban power distribution network fault diagnosis system and method, and the system comprises a detection unit and a diagnosis center. The detection unit comprises an induction charging module, an induction detection module, a control module, a relay module and a communication module, the detection unit is installed on a power grid node, the detection unit induces electric field change of the power grid node through the induction charging module for charging, and the induction detection module monitors voltage and current information of the power grid node in real time by inducting the electric field change; power grid node information is transmitted between adjacent detection units on the same line of the power grid through the communication module, a monitoring network matched with power grid nodes and lines is formed, the relay module transmits the received power grid node information to the diagnosis center in a relay mode, and the diagnosis center conducts fault diagnosis on the power grid according to the power grid node information; when power is off, information required by further accurate diagnosis is provided for a diagnosis center, and the accuracy of diagnosis is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid fault diagnosis, and in particular to a system and method for diagnosing a fault in a town distribution network. Background Art

[0002] Grid fault diagnosis is one of the basic issues that need to be solved in the intelligentization of smart grid fault decision-making. Rapidly and effectively diagnosing grid faults to isolate faulty components and avoid the expansion of accidents, and then taking corresponding measures to quickly restore power supply, is of great significance for shortening power outage time and improving fault handling efficiency.

[0003] A variety of power grid fault diagnosis systems and methods have been proposed in the prior art, such as a power grid fault diagnosis method and device proposed in a Chinese invention patent with application number CN201910133422.9. The patent provides a hierarchical fault diagnosis model. After obtaining the fault alarm information of the power grid, the different levels of the hierarchical fault diagnosis model are used to diagnose the known faults and unknown faults of the power grid. After the unknown fault is diagnosed using the unknown fault diagnosis layer, the fault diagnosis results of the unknown fault diagnosis layer are fed back to the known fault diagnosis layer by utilizing the interaction between the levels, and the known fault diagnosis layer is updated so that the known fault diagnosis layer can diagnose more power grid faults.

[0004] However, the prior art has not proposed a power grid fault diagnosis system that can still accurately diagnose the fault location of the power grid when the power grid fails and the power is cut off. After the power grid fails and the power is cut off, the fault alarm unit of the power grid will mostly fail due to the power outage after issuing an alarm, and further accurate diagnosis can no longer be performed, resulting in the problem that the existing power grid fault diagnosis system has inaccurate diagnosis results due to insufficient diagnostic information. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a system and method for diagnosing faults in urban distribution networks, which can provide a diagnosis center with the information required for further accurate diagnosis when a power outage occurs, thereby improving the accuracy of diagnosis.

[0006] A town distribution network fault diagnosis system of the present invention comprises a detection unit and a diagnosis center; the detection unit comprises an inductive charging module, an inductive detection module, a control module, a relay module and a communication module; the detection unit is installed on a grid node and is provided with a corresponding number; the detection unit is charged by inductively sensing electric field changes of the grid node through the inductive charging module; the inductive detection module monitors the voltage and current information of the grid node in real time through inductive electric field changes; the grid node information is transmitted between adjacent detection units on the same line of the grid through the communication module to form a monitoring network matching the grid nodes and lines; the relay module relays the received grid node information to the diagnosis center, and the diagnosis center performs fault diagnosis on the grid according to the grid node information; the town distribution network is an AC grid, and when the grid is working normally When the power grid node generates a regularly changing electric field, the induction detection module detects the power information at the node in real time, the power information includes voltage and current, etc. The power information generated by the downstream detection unit is transmitted to the upstream detection unit through the communication module, and the information is superimposed and packaged through the relay module and gradually transmitted upstream. The power information is received by the diagnosis center, and the diagnosis center performs preliminary diagnosis of the power grid fault according to the information transmitted by multiple detection units; when a power grid fault causes power outages at several nodes of the power grid, the induction charging module supplies power to the detection unit on the power grid node at the power outage, so that the detection unit can still send monitoring information of the power grid node in the case of power outage, and provide the diagnosis center with the information required for further accurate diagnosis, so that the diagnosis information is more sufficient and the accuracy of diagnosis is improved.

[0007] Preferably, it also includes a temperature detection module, which is installed in the detection unit and detects the node temperature of the power grid; the temperature detection module detects the temperature of the node of the power grid, and the temperature of the node is directly related to the voltage and current at the node. In the case of short circuit and high voltage and high current, the temperature of the node will rise rapidly. By setting the temperature rise threshold, power control of the node is convenient.

[0008] Preferably, the communication module includes a wireless communication module and a wired communication module. The wireless communication module is connected to the diagnosis center through the telecommunications network, and the wired communication module uses the power grid's wires as signal transmission lines. When the wired communication module fails, the wireless communication module starts; the wired communication module applies power line Internet access technology and is provided with a power cat. When the power grid is normal, the wired communication module located downstream loads information into the current of the wire, and the wired communication module located upstream separates the information from the current to achieve wired transmission of information; when the power grid fails and the power is cut off, the wired communication module directly transmits the information through the wires; by transmitting information between two adjacent wired communication modules, the problem of signal strength loss can be avoided; when the power grid failure is caused by a hardware failure and the transmission line is disconnected, the wires between the nodes in the power grid fault area are broken, resulting in poor wired communication, the wireless communication module automatically starts and sends the information at the node to the diagnosis center.

[0009] Preferably, a response module is also included. The response module is set in the detection unit. When the upstream communication module receives the power grid node information, the response module replies with a receiving signal to the downstream communication module through the communication module. After the downstream communication module receives the reply receiving signal, it stops repeatedly sending the power grid node information; when the downstream communication module repeatedly sends more than a set number of times, the wireless communication module is started; by setting the response module, the communication reliability between the detection units is improved, and the repeated sending of power grid node information can be reduced; when the downstream detection unit repeatedly sends the node information for many times through the wired communication module and no reply is received, it is judged that the line or hardware between the detection unit and the upstream detection unit is disconnected, and the wired communication module fails, and the wireless communication module is turned on at this time.

[0010] Preferably, a positioning module is also included. The positioning module is set in the detection unit, and the positioning module loads the location information and time information into the power grid node information; when a power grid fails, the diagnosis center can determine the location of the failed power grid node through the location information in the power grid node information, and determine the equipment group in the faulty area according to the equipment number corresponding to the power grid node location; by determining the sequence of time information of each faulty node, the node that fails first is determined, thereby diagnosing the source equipment of the power grid failure, thereby improving the accuracy of diagnosis.

[0011] Preferably, it also includes a self-check module, which performs self-check on the detection unit. When the self-check fails, the detection unit goes offline, and the downstream detection unit communicates with the upstream detection unit by bypassing the detection unit, and the upstream detection unit loads the information of the detection unit going offline into the power grid node information; by setting up the self-check module, the whole monitoring network is prevented from being paralyzed due to damage of a few detection units themselves, thereby improving the reliability of the monitoring network; the upstream detection unit determines whether there is an offline detection unit downstream by checking the position information in the received power grid node information, and loads the position information of the offline detection unit into the power grid node information and sends it to the diagnosis center, and the diagnosis center displays the position of the offline detection unit and alarms.

[0012] Preferably, a fuse module is further included. The detection unit is provided with the fuse module, which limits the voltage and current generated by the inductive charging module. When the electric field of the grid node changes drastically, the inductive charging module generates a current with a higher voltage, and the fuse module consumes the voltage and current exceeding the limit, thereby reducing the damage to the detection unit caused by excessive voltage and current.

[0013] Preferably, the diagnostic center sets up a diagnostic model, and the diagnostic model is provided with a storage module, a comparison module, a parameter adjustment module and an output module. The storage module is provided with a firmware area and a temporary area. The firmware area is used to store the set values ​​of each item in each power grid node information and the simulated power grid diagram. The temporary area is used to temporarily store each power grid node information in a detection cycle. The comparison module is used to retrieve the information in the temporary area and compare it with the information in the firmware area. The output module highlights the power grid node information that exceeds the set value on the simulated power grid diagram. The parameter adjustment module is used to update the set value in the firmware area.

[0014] A method for diagnosing faults in a town distribution network of the present invention comprises: S1. The detection unit monitors the voltage and current of the grid node in real time to form grid node information. Multiple detection units relay the grid node information to the diagnosis center; S2. The diagnostic center analyzes the grid node information through the diagnostic model, and the diagnostic model compares the various values ​​in the grid node information with the set values; S3, extracting the grid node information of the items exceeding the set value in S2 as fault information, highlighting the fault area in the grid simulation diagram according to the position information in the fault information, and issuing an alarm; S4. Sort the fault nodes in the fault area by time according to the time information in the fault information, and determine the source node where the fault occurs.

[0015] Preferably, S1, the diagnostic model extracts the fault information sent by the wireless communication module from the fault information to form secondary fault information; S2, forming a fault area 2 where the wire or hardware is disconnected in the grid node according to the location information in the secondary fault information; S3. Remotely troubleshoot fault area 2 according to the corresponding equipment troubleshooting procedure; if troubleshooting fails, dispatch troubleshooters.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the urban distribution network is an AC power grid. When the power grid is operating normally, the power grid nodes generate regularly changing electric fields. The induction detection module detects the power information at the nodes in real time. The power information includes voltage and current, etc. The power information generated by the downstream detection unit is transmitted to the upstream detection unit through the communication module, and the information is superimposed and packaged through the relay module and gradually transmitted upstream. The power information is received by the diagnosis center, and the diagnosis center performs preliminary diagnosis of the power grid fault according to the information transmitted by multiple detection units; when a fault occurs in the power grid and causes power outages at several nodes of the power grid, the induction charging module supplies power to the detection unit on the power grid node at the power outage, so that the detection unit can still send monitoring information of the power grid node in the case of power outage, and provide the diagnosis center with the information required for further accurate diagnosis. The diagnosis information is more sufficient, thereby improving the accuracy of diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of a detection unit of the present invention; Figure 3 It is a schematic diagram of the connection structure of each module in the detection unit of the present invention; Figure 4 is a schematic diagram of a diagnostic model of the present invention; Figure 5 is a schematic flow chart of the diagnostic method of the present invention; Figure 6 It is a flowchart of hardware fault diagnosis of the present invention. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] Example 1 like Figure 1 , Figure 2 and Figure 3As shown, a system and method for fault diagnosis of urban distribution network includes a detection unit and a diagnosis center; the detection unit includes an inductive charging module, an inductive detection module, a control module, a relay module and a communication module, the detection unit is installed on the grid node and set with a corresponding number, the detection unit charges by inductively sensing the electric field change of the grid node through the inductive charging module, the inductive detection module monitors the voltage and current information of the grid node in real time by sensing the electric field change, the grid node information is transmitted between adjacent detection units on the same line of the grid through the communication module, forming a monitoring network matching the grid nodes and lines, the relay module relays the received grid node information to the diagnosis center, and the diagnosis center performs fault diagnosis on the grid according to the grid node information; it also includes a temperature detection module, the temperature detection module is installed in the detection unit, and the temperature detection module detects the node temperature of the grid; it also includes a positioning module, the positioning module is set in the detection unit, and the positioning module loads the position information and time information into the grid node information; it also includes a safety module, the safety module is set in the detection unit, and the safety module limits the voltage and current generated by the inductive charging module.

[0020] The urban distribution network is an AC power grid. When the power grid is working normally, the power grid nodes generate regularly changing electric fields. When the electric fields of the power grid nodes change dramatically, the inductive charging module generates a current with a higher voltage. The insurance module consumes the voltage and current exceeding the limit, thereby reducing the damage to the detection unit caused by excessive voltage and current. The inductive detection module detects the power information at the node in real time. The power information includes voltage and current, etc. The temperature detection module detects the temperature of the nodes of the power grid. The power information generated by the downstream detection unit is transmitted to the upstream detection unit through the communication module, and the information is superimposed and packaged through the relay module and gradually transmitted upstream. The power information is received by the diagnosis center, and the diagnosis center detects the power information according to the information transmitted by multiple detection units. The information is used to pre-diagnose the fault of the power grid; when a fault occurs in the power grid and causes power outages at several nodes of the power grid, the inductive charging module supplies power to the detection unit on the power grid node at the power outage, so that the detection unit can still send monitoring information of the power grid node in the case of power outage, and provide the diagnosis center with the information required for further accurate diagnosis. The diagnostic information is more complete and the accuracy of diagnosis is improved. When a fault occurs in the power grid, the diagnosis center can determine the location of the faulty power grid node through the location information in the power grid node information, and determine the equipment group in the fault area according to the equipment number corresponding to the power grid node location; by determining the sequence of time information of each faulty node, the node that fails first is determined, thereby diagnosing the source device of the power grid fault.

[0021] Example 2 like Figure 2 and Figure 3As shown, the communication module includes a wireless communication module and a wired communication module. The wireless communication module is connected to the diagnosis center through the telecommunication network, and the wired communication module uses the wires of the power grid as signal transmission lines. When the wired communication module fails, the wireless communication module is started; it also includes a response module. The response module is set in the detection unit. When the upstream communication module receives the power grid node information, the response module replies a receiving signal to the downstream communication module through the communication module. After receiving the reply receiving signal, the downstream communication module stops repeatedly sending the power grid node information; when the downstream communication module repeats sending more than a set number of times, the wireless communication module is started; it also includes a self-test module. The self-test module performs self-test on the detection unit. When the self-test fails, the detection unit goes offline, and the downstream detection unit bypasses the detection unit and communicates with the upstream detection unit, and the upstream detection unit loads the information that the detection unit goes offline into the power grid node information.

[0022] The wired communication module applies power line Internet access technology and is equipped with a power cat. When the power grid is normal, the wired communication module located downstream loads information into the current of the wire, and the wired communication module located upstream separates the information from the current to realize wired transmission of information; when the power grid fails and the power is cut off, the wired communication module directly transmits the information through the wire; by transmitting information between two adjacent wired communication modules, the problem of signal strength loss can be avoided; when the downstream detection unit repeatedly sends node information through the wired communication module for many times and does not receive a reply, it is judged that the line or hardware between the detection unit and the upstream detection unit is disconnected, and the wired communication module fails. At this time, the wireless communication module is turned on to send the information at the node to the diagnosis center. By setting up a response module, the communication reliability between the detection units is improved, and the repeated sending of grid node information can be reduced; the upstream detection unit determines whether there is an offline detection unit downstream by checking the location information in the received grid node information, and loads the location information of the offline detection unit into the grid node information and sends it to the diagnosis center. The diagnosis center displays the location of the offline detection unit and alarms, avoiding the paralysis of the entire monitoring network due to damage to a few detection units themselves.

[0023] Example 3 like Figure 4 , Figure 5 and Figure 6 As shown, the diagnostic model is provided with a storage module, a comparison module, a parameter adjustment module and an output module. The storage module is provided with a firmware area and a temporary area. The firmware area is used to store the set values ​​of each item in each power grid node information and the simulated power grid diagram. The temporary area is used to temporarily store each power grid node information in a detection cycle. The comparison module is used to retrieve the information in the temporary area and compare it with the information in the firmware area. The output module highlights the power grid node information that exceeds the set value on the simulated power grid diagram. The parameter adjustment module is used to update the set value in the firmware area.

[0024] During diagnosis, the detection unit monitors the voltage and current of the grid node in real time to form grid node information, and multiple detection units relay to send the grid node information to the temporary area of ​​the storage module; the diagnosis center analyzes the grid node information through the diagnosis model, and the comparison module compares the various values ​​in the grid node information with the set values; the grid node information of the items that exceed the set values ​​is extracted as fault information, and the fault area is highlighted in the grid simulation diagram according to the position information in the fault information to form an alarm; the fault nodes in the fault area are sorted in time according to the time information in the fault information, and the source node of the fault is determined; the diagnosis model extracts the fault information sent from the fault information through the wireless communication module to form secondary fault information; according to the position information in the secondary fault information, a fault area two where the wires or hardware are disconnected in the grid node is formed; remote troubleshooting is performed on the fault area two according to the corresponding equipment troubleshooting program; and troubleshooting personnel are dispatched if troubleshooting fails.

[0025] like Figures 1 to 6 As shown, a system and method for fault diagnosis of a town distribution network of the present invention, when working, firstly, a plurality of detection units are installed on key nodes of the power grid respectively to form a monitoring network, and then when the power grid is working normally, the power grid nodes generate a regularly changing electric field, and the detection unit is charged by sensing the electric field change of the power grid node through the inductive charging module, and the inductive detection module detects the power information at the node in real time, and the power information generated by the downstream detection unit is transmitted to the upstream detection unit through the wired communication module, and the information is superimposed and packaged through the relay module and gradually transmitted upstream, and the power information is received by the diagnosis center, and the diagnosis center pre-diagnoses the fault of the power grid according to the information transmitted by the plurality of detection units; then, when a fault occurs in the power grid, the inductive charging ... at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through the wired communication module, and the power information at the node is transmitted to the upstream detection unit through The charging module supplies power to the detection unit on the grid node at the power-off location, so that the detection unit can still send monitoring information of the grid node in the case of power outage. The diagnosis center analyzes the grid node information through the diagnosis model, and the diagnosis model compares the various values ​​in the grid node information with the set values; the grid node information of the items that exceed the set values ​​in S2 is extracted as fault information, and the fault area is highlighted in the grid simulation diagram according to the location information in the fault information, and an alarm is issued; finally, the fault nodes in the fault area are sorted by time according to the time information in the fault information, and the source node of the fault is determined; the fault area is remotely troubleshooted according to the corresponding equipment troubleshooting procedure; if the troubleshooting fails, troubleshooting personnel can be dispatched.

[0026] The main functions achieved by the present invention are: 1. Provide the diagnostic center with the information required for further accurate diagnosis when the power is off, thus improving the accuracy of diagnosis; 2. Use power line communication technology to transmit power node information through the power grid; 3. Ability to identify equipment groups in fault areas; 4. Ability to identify the node where the fault first occurs and diagnose the source device of the power grid fault; 5. Be able to diagnose whether the fault area is a software fault or a hardware fault.

[0027] The installation method, connection method or setting method of the urban distribution network fault diagnosis system and method of the present invention are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects; the diagnostic model, storage module, parameter adjustment module, self-test module, positioning module, response module, communication module, wireless communication module, wired communication module, temperature detection module, induction charging module and induction detection module of the urban distribution network fault diagnosis system and method of the present invention are purchased on the market, and technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fault diagnosis system for urban distribution network, comprising a detection unit and a diagnosis center; characterized in that: The detection unit includes an inductive charging module, an inductive detection module, a control module, a relay module and a communication module. The detection unit is installed on the grid node and is set with a corresponding number. The detection unit is charged by sensing the electric field changes of the grid node through the inductive charging module. The inductive detection module monitors the voltage and current information of the grid node in real time by sensing the electric field changes. The grid node information is transmitted between adjacent detection units on the same line of the grid through the communication module to form a monitoring network matching the grid nodes and lines. The relay module relays the received grid node information to the diagnosis center, and the diagnosis center performs fault diagnosis on the grid according to the grid node information.

2. A system for diagnosing faults in urban distribution networks as claimed in claim 1, characterized in that: It also includes a temperature detection module, which is installed in the detection unit and detects the node temperature of the power grid.

3. A system for diagnosing faults in urban distribution networks as claimed in claim 1, characterized in that: The communication module includes a wireless communication module and a wired communication module. The wireless communication module is connected to the diagnosis center through the telecommunications network, and the wired communication module uses the power grid's wires as signal transmission lines. When the wired communication module fails, the wireless communication module starts.

4. A system for diagnosing faults in urban distribution networks as claimed in claim 3, characterized in that: It also includes a response module. The response module is set in the detection unit. When the upstream communication module receives the power grid node information, the response module replies with a receiving signal to the downstream communication module through the communication module. After the downstream communication module receives the reply receiving signal, it stops repeatedly sending the power grid node information; when the downstream communication module repeats the transmission for more than a set number of times, the wireless communication module is started.

5. A system for diagnosing faults in urban distribution networks as claimed in claim 3, characterized in that: It also includes a positioning module. The positioning module is set in the detection unit, and the positioning module loads the position information and time information into the power grid node information.

6. A system for diagnosing faults in urban distribution networks as claimed in claim 3, characterized in that: It also includes a self-check module, which performs self-check on the detection unit. When the self-check fails, the detection unit goes offline, the downstream detection unit communicates with the upstream detection unit by bypassing the detection unit, and the upstream detection unit loads the information that the detection unit goes offline into the grid node information.

7. A system for diagnosing faults in urban distribution networks as claimed in claim 1, characterized in that: It also includes a safety module, which is arranged in the detection unit and limits the magnitude of the voltage and current generated by the induction charging module.

8. A system for diagnosing faults in urban distribution networks as claimed in claim 1, characterized in that: The diagnosis center sets up a diagnosis model, and the diagnosis model is provided with a storage module, a comparison module, a parameter adjustment module and an output module. The storage module is provided with a firmware area and a temporary area. The firmware area is used to store the set values ​​of each item in each power grid node information and the simulated power grid diagram. The temporary area is used to temporarily store each power grid node information in a detection cycle. The comparison module is used to retrieve the information in the temporary area and compare it with the information in the firmware area. The output module will highlight the power grid node information that exceeds the set value on the simulated power grid diagram. The parameter adjustment module is used to update the set value in the firmware area.

9. A method for diagnosing faults in a town distribution network, characterized in that: include: S1. The detection unit monitors the voltage and current of the grid node in real time to form grid node information. Multiple detection units relay the grid node information to the diagnosis center; S2. The diagnostic center analyzes the grid node information through the diagnostic model, and the diagnostic model compares the various values ​​in the grid node information with the set values; S3, extracting the grid node information of the items exceeding the set value in S2 as fault information, highlighting the fault area in the grid simulation diagram according to the position information in the fault information, and issuing an alarm; S4. Sort the fault nodes in the fault area by time according to the time information in the fault information, and determine the source node where the fault occurs.

10. A method for diagnosing faults in a town distribution network as claimed in claim 9, characterized in that: include: S1. The diagnostic model extracts the fault information sent by the wireless communication module from the fault information to form secondary fault information; S2, forming a fault area 2 where the wire or hardware is disconnected in the grid node according to the location information in the secondary fault information; S3. Remotely troubleshoot fault area 2 according to the corresponding equipment troubleshooting procedure; if troubleshooting fails, dispatch troubleshooters.

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