A panoramic sensing self-healing system and method for distribution network

Abstract

The present invention discloses a panoramic perception self-healing system and method for a distribution network, the system includes a sampling module, a communication module, a fault isolation module, a self-healing gate module and a backup protection module. The method includes: the self-healing terminal collects the analog quantity, switch status and operation information of each interval connected in real time; connects several self-healing terminals to form a ring network, and shares data on the analog quantity, switch status and operation information in the ring network; when a fault occurs in the protection range of the self-healing terminal, the fault area is isolated; the self-healing charging function is performed, the voltage condition on the fault side is checked, and power is supplied when the voltage is abnormal; when an abnormal phenomenon occurs in the distribution network after fault isolation or power supply restoration, the protection function is turned on. The present invention enables fault isolation and self-healing gate to be performed at the local terminal, so as to achieve the purpose of real-time decision-making and rapid control.

Description

Technical Field

[0001] The present invention relates to the field of power distribution network monitoring, and in particular to a panoramic sensing self-healing system and method for a power distribution network. Background Art

[0002] Power distribution is an important part of the power system. It is directly facing power users and undertakes power supply services for power users. With the rapid and healthy development of the national economy and the continuous improvement of people's material and cultural living standards, people have higher requirements for the reliability and power supply quality of the distribution network. Effectively reducing power outage time is an important indicator for improving users' power experience. At the same time, achieving panoramic perception, flexibility, safety and controllability of the distribution network will definitely be the future development trend.

[0003] There are a certain number of intervals in the distribution network to monitor the safe operation of the distribution network. At present, the intervals are scattered in each distribution interval. When the distribution network suffers a fault, the distribution master station realizes fault location according to the fault characteristics of the distribution network, and then sends control commands to each interval to isolate the fault area and restore power supply to the non-fault area. This method has poor real-time performance. The distribution master station needs to collect fault current data of all intervals before making a decision. Therefore, it takes a long time from the occurrence of the fault to the restoration of power supply to the non-fault area, and the reliability is also poor. Once a problem occurs in the distribution master station, the entire distribution network will lose control. For this reason, some scholars have proposed to deploy multiple self-healing control units in the distribution network, each self-healing control unit corresponds to multiple intervals. When the distribution network suffers a fault, the self-healing control unit realizes fault location according to the fault characteristics of the distribution network; the self-healing control unit related to the fault point sends a control command to each corresponding interval, so that all switches around the fault point are opened to achieve isolation of the fault area, and then sends a power restoration signal to the contact switch or outlet circuit breaker that is not in the fault area, so that the contact switch or outlet circuit breaker that is not in the fault area is closed again, and the power supply to the non-fault area is restored. This method is not very selective when isolating faults through a self-healing control unit. Blindly disconnecting all switches around the fault point and then restoring power to non-fault areas also takes a long time. In addition, the communication reliability between the self-healing control unit and the interval is also required to be high. Summary of the invention

[0004] In view of this, the purpose of the embodiments of the present invention is to provide a panoramic perception self-healing system and method for a distribution network, which can enable fault isolation and self-healing to be performed at the local terminal, thereby achieving the purpose of real-time decision-making and rapid control.

[0005] In a first aspect, an embodiment of the present invention provides a panoramic perception self-healing system for a distribution network, comprising:

[0006] The sampling module is used for the self-healing terminal to collect the analog quantity, switch status and operation information of each connected interval in real time.

[0007] The communication module is used to connect several self-healing terminals to form a ring network and share data on analog quantities, switch status and operating information within the ring network.

[0008] The fault isolation module is used to isolate the fault area when a fault occurs in the protection range of the self-healing terminal.

[0009] The self-healing gate module is used to perform self-healing charging function, check the voltage condition on the fault side, and provide power when the voltage is abnormal.

[0010] The backup protection module is used to enable protection functions when abnormal phenomena occur in the distribution network after fault isolation or power supply restoration.

[0011] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the sampling module includes:

[0012] The analog quantity acquisition unit is used for each self-healing terminal to collect the current and voltage data of each interval.

[0013] The switch status collection unit is used for each self-healing terminal to collect the circuit breaker status of each interval.

[0014] The operation information collection unit is used for each self-healing terminal to collect the distribution network operation information of each interval.

[0015] In combination with the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the fault isolation module includes:

[0016] The judging unit is used to judge the fault characteristics.

[0017] The line differential protection unit is used to trip the corresponding circuit breaker when a line fault occurs in the distribution network.

[0018] The busbar differential protection unit is used to trip the corresponding circuit breaker when a busbar fault occurs in the distribution network.

[0019] The small power supply unit is used to connect and cut off the small power supply when there is a small power supply line connected to the distribution network and it is determined that the bus voltage supported by the small power supply affects the self-healing no-voltage judgment function.

[0020] The failure protection unit is used to delay the "switch refusal to trip judgment time" after the interval trips. If the switch is still not in the tripping position or there is flow, the self-healing terminal will report a "switch refusal to trip" message, trip the interval to which the self-healing terminal is connected, and remotely trip the opposite side incoming line interval.

[0021] In combination with the first aspect, the embodiment of the present invention provides a third possible implementation of the first aspect, wherein the self-healing gate module includes:

[0022] The charging unit is used for initialization of distribution network operation. There is voltage on both sides of the open-loop point, and the open-loop point switch is in the no-current position. Charging is completed after a 10s delay.

[0023] The closing start unit is used to start the self-healing function of the self-healing terminal on the no-pressure side if it is detected that the self-healing terminal on the fault side has no pressure and the self-healing terminal on the opposite side has pressure at the open-loop point after the fault isolation is completed.

[0024] The power supply restoration unit is used to close the open-loop circuit breaker when the closing start unit is actuated, so that the power supply to the non-fault area can be quickly restored. The self-healing delay is determined according to the power supply situation.

[0025] In combination with the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the backup protection module includes:

[0026] The fault disconnection unit is used to start the fault disconnection function and disconnect the small power interval circuit breaker when the distribution network system is connected to a small power source after the fault is cleared, and low frequency, low voltage or over frequency, over voltage occurs. The disconnection delay is determined according to the voltage condition.

[0027] The overcurrent acceleration protection unit is used to start the overcurrent acceleration protection function of the self-healing terminals on both sides of the open loop point when the self-healing terminal is closed on a fault, and accelerate the instantaneous tripping of the circuit breaker of the self-healing switch.

[0028] The self-healing overload unit is used when the switch on the power supply side of the electrical island where the self-healing terminal is located is overloaded due to a sudden increase in load after the self-healing terminal is self-healed. The self-healing terminal where the switch on the power supply side is located sends an overload signal to the self-healing system ring network. The self-healing terminal that previously self-healed will instantly open the open-loop circuit breaker after receiving the overload signal.

[0029] In a second aspect, an embodiment of the present invention further provides a panoramic perception self-healing method for a distribution network, which includes:

[0030] The self-healing terminal collects the analog quantity, switch status and operation information of each connected interval in real time.

[0031] Connect several self-healing terminals to form a ring network, and share data on analog quantities, switch status, and operating information within the ring network.

[0032] When a fault occurs in the protection range of the self-healing terminal, the faulty area is isolated.

[0033] Perform self-healing charging function, check the voltage condition on the fault side, and provide power when the voltage is abnormal.

[0034] When an abnormality occurs in the distribution network after fault isolation or power restoration, the protection function is turned on.

[0035] In combination with the second aspect, an embodiment of the present invention provides a first possible implementation of the second aspect, wherein the self-healing terminal collects analog quantities, switch states, and operation information of each connected interval in real time, including:

[0036] Each self-healing terminal collects current and voltage data at each interval.

[0037] Each self-healing terminal collects the circuit breaker status of each bay.

[0038] Each self-healing terminal collects the distribution network operation information of each interval.

[0039] In combination with the second aspect, an embodiment of the present invention provides a second possible implementation manner of the second aspect, wherein when a fault occurs in a protection range of the self-healing terminal, isolating the faulty line includes:

[0040] Determine the fault characteristics.

[0041] When a line fault occurs in the distribution network, the corresponding circuit breaker is tripped.

[0042] When a busbar fault occurs in the distribution network, the corresponding circuit breaker is tripped.

[0043] When a small power source is connected to the distribution network, if it is determined that the bus voltage supported by the small power source affects the self-healing no-voltage judgment function, the small power source is connected and cut off.

[0044] When the interval trips and the "switch refusal to trip judgment time" is delayed, if the switch is still not in the tripping position or there is flow, the self-healing terminal will report a "switch refusal to trip" message, trip the interval to which the self-healing terminal is connected, and remotely trip the incoming line interval on the opposite side.

[0045] In combination with the second aspect, an embodiment of the present invention provides a third possible implementation of the second aspect, wherein the performing of the self-healing charging function, checking the voltage condition on the fault side, and supplying power when the voltage is abnormal includes:

[0046] The distribution network operation is initialized, there is voltage on both sides of the open-loop point, and the open-loop point switch jumps to no current, and charging is completed after a 10s delay.

[0047] If after the fault isolation is completed, it is monitored that the self-healing terminal on the fault side has no pressure and the self-healing terminal on the opposite side has pressure at the open-loop point, the self-healing gate function of the self-healing terminal on the no-pressure side will be started.

[0048] When the closing start unit is activated, the open-loop circuit breaker is closed to quickly restore power supply to the non-fault area. The self-healing delay is determined according to the power supply situation.

[0049] In combination with the second aspect, an embodiment of the present invention provides a fourth possible implementation of the second aspect, wherein when an abnormal phenomenon occurs in the distribution network after fault isolation or power restoration, starting the protection function includes:

[0050] After the fault is cleared, if the distribution network system is connected to a small power source and low frequency, low voltage, over frequency, or over voltage occurs, the fault disconnection function is activated to disconnect the small power interval circuit breaker, and the disconnection delay is determined according to the voltage condition.

[0051] When the self-healing terminal is closed to a fault, the overcurrent acceleration protection function of the self-healing terminals on both sides of the open loop point is started to accelerate the instantaneous tripping of the circuit breaker of the self-healing switch.

[0052] When the self-healing terminal heals itself, and the switch on the power supply side of the electrical island where the self-healing terminal is located is overloaded due to a sudden increase in load, the self-healing terminal where the switch on the power supply side is located sends an overload signal to the self-healing system ring network. The self-healing terminal that previously healed itself instantly opens the open-loop circuit breaker after receiving the overload signal.

[0053] The beneficial effects of the embodiments of the present invention are:

[0054] The present invention provides a panoramic perception self-healing system and method for distribution network. The system includes N distribution network panoramic perception self-healing terminals with the same hardware and software programs. The self-healing terminals are connected by optical fiber to form a ring network, realizing panoramic data sharing of electrical quantities and fault information in the distribution network; each self-healing terminal can collect electrical quantities and switch quantities of 4 intervals and 2 distribution transformers, and transmit the operation information to other self-healing terminals in the ring network in real time; each healing terminal jointly makes real-time decisions based on the fault current and operation information in the distribution network of the protected area, accurately locates the fault point, realizes fault isolation, and quickly controls the opening point switch closing. In this way, fault isolation and self-healing are both performed at the local terminal, achieving the purpose of real-time decision-making and rapid control. Through the panoramic perception, precise positioning, real-time isolation, and rapid closing of the distribution network in the protected area by each terminal, the power supply restoration time in the non-fault area is further shortened, the power supply reliability is greatly improved, and the user's better power experience is satisfied. At the same time, the self-healing system can be expanded to a maximum of 10 self-healing terminals, and the self-healing terminals can be connected to a maximum of 16 intervals. The open-loop point can be adaptively adjusted according to the position of the circuit breaker of the main line of the on-site distribution network, thereby improving the versatility of the system and having great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 A schematic diagram of the topological structure of the panoramic sensing self-healing system for the power distribution network of the present invention;

[0057] Figure 2 It is a schematic diagram of the RTDS simulation model of the panoramic sensing self-healing system for the distribution network of the present invention;

[0058] Figure 3 The figure is a flow chart of the panoramic perception self-healing method for distribution network of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Please refer to Figure 1 to Figure 2 The first embodiment of the present invention provides a panoramic perception self-healing system for a distribution network, which includes:

[0061] The sampling module is used for the self-healing terminal to collect the analog quantity, switch status and operation information of each connected interval in real time.

[0062] The communication module is used to connect several self-healing terminals to form a ring network and share data on analog quantities, switch status and operating information within the ring network.

[0063] The fault isolation module is used to isolate the fault area when a fault occurs in the protection range of the self-healing terminal.

[0064] The self-healing gate module is used to perform self-healing charging function, check the voltage condition on the fault side, and provide power when the voltage is abnormal.

[0065] The backup protection module is used to enable protection functions when abnormal phenomena occur in the distribution network after fault isolation or power supply restoration.

[0066] Wherein, the sampling module comprises:

[0067] The analog quantity acquisition unit is used for each self-healing terminal to collect the current and voltage data of each interval.

[0068] The switch status collection unit is used for each self-healing terminal to collect the circuit breaker status of each interval.

[0069] The operation information collection unit is used for each self-healing terminal to collect the distribution network operation information of each interval.

[0070] Wherein, the fault isolation module includes:

[0071] The judging unit is used to judge the fault characteristics.

[0072] The line differential protection unit is used to trip the corresponding circuit breaker when a line fault occurs in the distribution network.

[0073] The busbar differential protection unit is used to trip the corresponding circuit breaker when a busbar fault occurs in the distribution network.

[0074] The small power supply unit is used to connect and cut off the small power supply when there is a small power supply line connected to the distribution network and it is determined that the bus voltage supported by the small power supply affects the self-healing no-voltage judgment function.

[0075] The failure protection unit is used to delay the "switch refusal to trip judgment time" after the interval trips. If the switch is still not in the tripping position or there is flow, the self-healing terminal will report a "switch refusal to trip" message, trip the interval to which the self-healing terminal is connected, and remotely trip the opposite side incoming line interval.

[0076] Wherein, the self-healing gate module comprises:

[0077] The charging unit is used for initialization of distribution network operation. There is voltage on both sides of the open-loop point, and the open-loop point switch is in the no-current position. Charging is completed after a 10s delay.

[0078] The closing start unit is used to start the self-healing function of the self-healing terminal on the no-pressure side if it is detected that the self-healing terminal on the fault side has no pressure and the self-healing terminal on the opposite side has pressure at the open-loop point after the fault isolation is completed.

[0079] The power supply restoration unit is used to close the open-loop circuit breaker when the closing start unit is actuated, so that the power supply to the non-fault area can be quickly restored. The self-healing delay is determined according to the power supply situation.

[0080] Wherein, the backup protection module includes:

[0081] The fault disconnection unit is used to start the fault disconnection function and disconnect the small power interval circuit breaker when the distribution network system is connected to a small power source after the fault is cleared, and low frequency, low voltage or over frequency, over voltage occurs. The disconnection delay is determined according to the voltage condition.

[0082] The overcurrent acceleration protection unit is used to start the overcurrent acceleration protection function of the self-healing terminals on both sides of the open loop point when the self-healing terminal is closed on a fault, and accelerate the instantaneous tripping of the circuit breaker of the self-healing switch.

[0083] The self-healing overload unit is used when the switch on the power supply side of the electrical island where the self-healing terminal is located is overloaded due to a sudden increase in load after the self-healing terminal is self-healed. The self-healing terminal where the switch on the power supply side is located sends an overload signal to the self-healing system ring network. The self-healing terminal that previously self-healed will instantly open the open-loop circuit breaker after receiving the overload signal.

[0084] Please refer to Figure 3 , the second embodiment of the present invention provides a specific embodiment of a panoramic perception self-healing system for a distribution network, wherein the panoramic perception self-healing system includes 4 self-healing terminals, and the self-healing terminals 1 to 4 are connected using dedicated optical fibers to form a ring network. Self-healing terminal 1 and self-healing terminal 4 are placed in distribution station A, and the intervals of bus 1 of distribution station A are connected to self-healing terminal 1, and the intervals of bus 2 of distribution station A are connected to self-healing terminal 4. Self-healing terminal 2 and self-healing terminal 3 are placed in distribution station B, and the intervals of bus 1 of distribution station B are connected to self-healing terminal 2, and the intervals of bus 2 of distribution station B are connected to self-healing terminal 3. Under this typical system topology, the implementation steps of the panoramic perception self-healing system are as follows:

[0085] Self-healing terminal 1 collects analog quantities, switch quantities and operation information of all intervals of bus 1 of distribution station A, self-healing terminal 2 collects analog quantities, switch quantities and operation information of all intervals of bus 1 of distribution station B, self-healing terminal 3 collects analog quantities, switch quantities and operation information of all intervals of bus 2 of distribution station B, and self-healing terminal 4 collects analog quantities, switch quantities and operation information of all intervals of bus 2 of distribution station A.

[0086] Each self-healing terminal packages the analog quantity, switch quantity and operation information it collects into IEC61850 9-2 messages and transmits them to the ring network through dedicated optical fiber, realizing panoramic data sharing within the ring network.

[0087] The self-healing system defines the distribution network topology information according to the information collected by the self-healing terminals 1 to 4, and then determines the charging condition of the self-healing system according to the topology information. If the charging condition is met, the self-healing system starts charging and the charging is completed after 10 seconds.

[0088] In RTDS, build Figure 2In the simulation model shown, F1~F16 are the set fault points. When the F1 point fault occurs in the distribution network, the upper busbar trips the S1 switch, busbar 1 and busbar 3 lose pressure, and the self-healing terminal 2 trips the "ZY2JG6" circuit breaker after the fault decoupling delay. The self-healing terminal 1 trips the "ZY1JG1" circuit breaker after the no-pressure tripping delay. The delay can be adjusted according to the actual situation. When the "ZY1JG1" circuit breaker trips, the small power supply S3 is cut off at the same time. The self-healing terminal 2 closes the "ZY2JG3" circuit breaker after the self-healing delay. The delay can be adjusted according to the actual situation, and the power supply of busbar 1 and busbar 3 is restored. If the "ZY1JG1" circuit breaker does not trip, after a delay, the self-healing terminal 1 reports the interval 1 switch refusal to trip message, and at the same time the self-healing terminal 1 failure protection is activated, tripping the "ZY1JG1", "ZY1JG2", "ZY1JG3", and "ZY1JG6" circuit breakers, and the self-healing terminal 2 remotely trips the "ZY2JG1" circuit breaker to complete the fault isolation. The self-healing terminal 2 closes the "ZY2JG3" circuit breaker, and the bus 3 resumes power supply.

[0089] When the F3 point fault occurs in the distribution network, the busbar protection of self-healing terminal 1 instantly trips the "ZY1JG1", "ZY1JG2", "ZY1JG3", and "ZY1JG6" circuit breakers, and self-healing terminal 2 remotely trips the "ZY2JG1" circuit breaker, and simultaneously cuts off the small power supply S3. Self-healing terminal 2 closes the "ZY2JG3" circuit breaker after the self-healing gate delays. The delay can be set according to the actual situation, and the power supply of bus 3 is restored. If the "ZY1JG2" circuit breaker is not tripped, because the self-healing terminal 2 has already tripped the "ZY2JG1" circuit breaker, the fault isolation has been completed, and the self-healing terminal 2 closes the "ZY2JG3" circuit breaker, and the power supply of bus 3 is restored.

[0090] When the F5 point fault occurs in the distribution network, the optical fiber differential protection of the self-healing terminal 1 line instantly trips the "ZY1JG2" circuit breaker, and the optical fiber differential protection of the self-healing terminal 2 line instantly trips the "ZY2JG1" circuit breaker, and simultaneously cuts off the small power supply S3. The self-healing terminal 2 closes the "ZY2JG3" circuit breaker after the self-healing gate delay. The delay can be set according to the actual situation, and the power supply of bus 3 is restored. If the "ZY2JG1" circuit breaker does not trip, after the delay, the self-healing terminal 2 reports the interval 1 switch refusal to trip message, and at the same time, the self-healing terminal 2 failure protection is activated, and the "ZY2JG1", "ZY2JG3", and "ZY2JG6" circuit breakers are tripped. Because the "ZY2JG1" circuit breaker has not tripped, the fault isolation is not completed, the self-healing system is discharged, and the power supply of bus 3 is no longer restored.

[0091] The embodiment of the present invention aims to protect a panoramic perception self-healing system and method for a distribution network, and has the following effects:

[0092] 1. The self-healing system realizes panoramic perception of all electrical quantities, switch quantities, and operating information of the distribution network, and shares data within the system ring network.

[0093] 2. The self-healing system realizes fault isolation and self-healing gate at the local self-healing terminal, so as to achieve real-time decision-making on fault isolation point and quickly execute the self-healing gate function.

[0094] 3. Each self-healing terminal in the self-healing system has the same hardware and software programs, and only needs to be configured and expanded according to the on-site conditions. The open-loop point can be flexibly adjusted according to the on-site distribution network topology to meet more applicable places.

[0095] The computer program product of the panoramic perception self-healing method and device for the distribution network provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method in the previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0096] Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, etc. When the computer program on the storage medium is run, it can execute the above-mentioned panoramic perception self-healing method for the distribution network, so that fault isolation and self-healing gates can be carried out at the local terminal, achieving the purpose of real-time decision-making and rapid control.

[0097] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0098] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A panoramic sensing self-healing system for distribution network, characterized in that: include: The sampling module is used for the self-healing terminal to collect the analog quantity, switch status and operation information of each connected interval in real time; The communication module is used to connect several self-healing terminals to form a ring network and share data on analog quantities, switch status and operation information within the ring network; A fault isolation module is used to isolate the fault area when a fault occurs in the protection range of the self-healing terminal; Self-healing gate module, used to perform self-healing charging function, check the voltage condition on the fault side, and supply power when the voltage is abnormal; The backup protection module is used to activate the protection function when an abnormality occurs in the distribution network after fault isolation or power restoration; The self-healing gate module comprises: The charging unit is used for initializing the operation of the distribution network. There is voltage on both sides of the open-loop point, and the open-loop point switch jumps to the position without current. Charging is completed after a 10s delay. The closing start unit is used to start the self-healing function of the self-healing terminal on the no-pressure side if it is detected that the self-healing terminal on the fault side has no pressure and the self-healing terminal on the opposite side has pressure at the open-loop point after the fault isolation is completed; The power supply restoration unit is used to close the open-loop circuit breaker when the closing start unit is activated, so that the power supply in the non-fault area can be quickly restored. The self-healing delay is determined according to the power supply situation; The fault isolation module comprises: A judgment unit, used for judging fault characteristics; Line differential protection unit, used to trip the corresponding circuit breaker when a line fault occurs in the distribution network; The bus differential protection unit is used to trip the corresponding circuit breaker when a bus fault occurs in the distribution network; The small power supply unit is used to connect and disconnect the small power supply when a small power supply line is connected to the distribution network and it is judged that the bus voltage supported by the small power supply affects the self-healing no-voltage judgment function; The failure protection unit is used to delay the "switch refusal to trip judgment time" after the interval tripping exit. If the switch is still not in the tripping position or there is flow, the self-healing terminal will report a "switch refusal to trip" message, trip the interval connected to the self-healing terminal, and remotely trip the opposite side incoming line interval; The backup protection module comprises: The fault disconnection unit is used to start the fault disconnection function and disconnect the small power supply interval circuit breaker when the distribution network system is connected to a small power supply after the fault is removed and low frequency, low voltage, over frequency or over voltage occurs. The disconnection delay is determined according to the voltage condition; The overcurrent acceleration protection unit is used to start the overcurrent acceleration protection function of the self-healing terminals on both sides of the open loop point when the self-healing terminal is closed on a fault, and accelerate the instantaneous tripping of the circuit breaker of the self-healing switch; The self-healing overload unit is used when the switch on the power supply side of the electrical island where the self-healing terminal is located is overloaded due to a sudden increase in load after the self-healing terminal is self-healed. The self-healing terminal where the switch on the power supply side is located sends an overload signal to the self-healing system ring network. The self-healing terminal that previously self-healed will instantly open the open-loop circuit breaker after receiving the overload signal.

2. The panoramic sensing self-healing system for distribution network according to claim 1, characterized in that: The sampling module comprises: The analog quantity acquisition unit is used for each self-healing terminal to collect the current and voltage data of each interval; A switch status collection unit is used for each self-healing terminal to collect the circuit breaker status of each interval; The operation information collection unit is used for each self-healing terminal to collect the distribution network operation information of each interval.

3. A panoramic perception self-healing method for distribution network, characterized in that: include: The self-healing terminal collects the analog quantity, switch status and operation information of each bay in real time; Connect several self-healing terminals to form a ring network, and share data on analog quantities, switch status, and operating information within the ring network; When a fault occurs in the protection range of the self-healing terminal, the faulty area is isolated; Perform self-healing charging function, check the voltage condition on the fault side, and supply power when the voltage is abnormal; When an abnormality occurs in the distribution network after fault isolation or power restoration, the protection function is turned on; The self-healing charging function is performed to check the voltage condition on the fault side and to supply power when the voltage is abnormal, including: The distribution network is initialized, there is voltage on both sides of the open-loop point, and the open-loop point switch is in the no-current state, and charging is completed after a 10s delay; If after the fault isolation is completed, it is monitored that the self-healing terminal on the fault side has no pressure and the self-healing terminal on the opposite side has pressure at the open loop point, the self-healing gate function of the self-healing terminal on the no-pressure side is started; When the closing start unit is activated, the open-loop circuit breaker is closed to quickly restore power supply to the non-fault area. The self-healing delay is determined according to the power supply situation. When a fault occurs in the protection range of the self-healing terminal, isolating the faulty line includes: Determine the fault characteristics; When a line fault occurs in the distribution network, the corresponding circuit breaker is tripped; When a busbar fault occurs in the distribution network, the corresponding circuit breaker is tripped; When a small power source line is connected to the distribution network, if it is judged that the bus voltage supported by the small power source affects the self-healing no-voltage judgment function, the small power source is connected and cut off; When the interval trips and the "switch refusal to trip judgment time" is delayed, if the switch is still not in the tripping position or there is flow, the self-healing terminal reports a "switch refusal to trip" message, trips the interval to which the self-healing terminal is connected, and remotely trips the opposite side incoming line interval; When an abnormal phenomenon occurs in the distribution network after fault isolation or power supply restoration, the protection function is activated including: After the fault is cleared, if the distribution network system is connected to a small power source and low frequency, low voltage, over frequency, or over voltage occurs, the fault disconnection function is activated to disconnect the small power interval circuit breaker. The disconnection delay is determined according to the voltage condition. When the self-healing terminal is closed to a fault, the overcurrent acceleration protection function of the self-healing terminals on both sides of the open loop point is activated to accelerate the instantaneous tripping of the circuit breaker of the self-healing switch; When the self-healing terminal heals itself, and the switch on the power supply side of the electrical island where the self-healing terminal is located is overloaded due to a sudden increase in load, the self-healing terminal where the switch on the power supply side is located sends an overload signal to the self-healing system ring network. The self-healing terminal that previously healed itself instantly opens the open-loop circuit breaker after receiving the overload signal.

4. The panoramic perception self-healing method for distribution network according to claim 3 is characterized in that: The self-healing terminal collects analog quantities, switch states and operation information of each connected interval in real time, including: Each self-healing terminal collects current and voltage data of each interval; Each self-healing terminal collects the circuit breaker status of each interval; Each self-healing terminal collects the distribution network operation information of each interval.

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