Distributed intelligent power distribution terminal, power distribution network intelligent distributed feeder automation system containing network construction elements and method

Abstract

The invention relates to a distributed intelligent power distribution terminal and a power distribution network intelligent distributed feeder automation system and method containing network construction elements. The distributed intelligent power distribution terminal comprises a control unit, a first 5G module, a second 5G module and a router. The control unit comprises a first station level network interface, a second station level network interface and a process level network interface, the first station level network interface is connected with the first 5G module, and the first 5G module establishes a communication link with a power distribution automation system; the first station level network interface is connected with the first 5G module, the second station level network interface is connected with the second 5G module, the second 5G module is connected with the router, the router is connected with the process level network interface, the second 5G module and the router form a 5G wireless private network, and communication link with other distributed intelligent power distribution terminals is realized through the 5G wireless private network. According to the invention, intelligent distributed feeder automation local control requirements and distribution automation master station monitoring requirements are met at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution network power distribution automation, in particular to a distributed intelligent power distribution terminal, a power distribution network intelligent distributed feeder automation system and method containing network elements. BACKGROUND

[0002] The current large-scale access of distributed power supply to the power distribution network has a profound impact on the operation of the power distribution line. Intelligent distributed feeder automation is a feeder automation mode that uses intelligent terminal devices (such as FTU / DTU) on the power distribution line to realize direct data interaction and collaborative decision-making between terminals through a high-speed local communication network (such as optical fiber / wireless), without the need for the intervention of a master station to independently complete fault location, isolation, and power supply restoration in the non-fault area within seconds. Intelligent distributed feeder automation is an advanced feeder automation method to address the difficulties in fault location and power supply restoration decision-making caused by changes in short-circuit current on the power distribution line after the access of distributed power supply. However, intelligent distributed feeder automation has high communication requirements, generally requiring the use of optical fiber communication and 5G communication. The laying of optical fiber communication on rural power distribution lines is costly and difficult to implement, and only 5G communication can be used. However, 5G communication for wireless remote control faces security protection requirements, and on-site control for intelligent distributed feeder automation also needs to meet the monitoring needs of the power distribution automation system. Existing intelligent terminal devices cannot meet the above diverse needs, affecting the application of intelligent distributed feeder automation on power distribution lines containing distributed power supply. With the development of network construction technology, more and more distributed photovoltaic, energy storage, and variable-frequency small hydropower distributed power supplies have network construction capabilities and low-voltage ride-through capabilities. Traditional feeder automation and conventional intelligent distributed feeder automation methods usually immediately disconnect distributed photovoltaic, energy storage, and variable-frequency small hydropower distributed power supplies from the network after a fault occurs, converting them into conventional single-power supply power distribution networks with only loads, and then performing conventional feeder automation according to the main network. This mode does not take advantage of the multi-power supply of distributed photovoltaic, energy storage, and variable-frequency small hydropower distributed power supplies to improve power supply reliability, and also leads to the loss of distributed power generation capacity. In addition, immediately disconnecting distributed photovoltaic, energy storage, and variable-frequency small hydropower distributed power supplies from the network after a fault occurs is not conducive to the safe operation of the main network, and large-scale distributed power supply will lead to instability in the frequency and voltage of the main network. At the same time, the insulation level of the power distribution network is becoming higher and higher, and the instantaneous fault of the power distribution network is showing a downward trend. Permanent faults are dominant in some areas. The traditional feeder automation and conventional intelligent distributed feeder automation methods are not conducive to shortening the fault outage time, and reclosing has a negative impact on insulation under permanent faults. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a distributed intelligent power distribution terminal, a power distribution network intelligent distributed feeder automation system and method containing network elements, which can provide terminal equipment basis for intelligent distributed feeder automation implementation and help the application of intelligent distributed feeder automation in power distribution lines containing distributed power sources.

[0004] The technical solution adopted by the present application to solve its technical problem is to provide a distributed intelligent power distribution terminal, which comprises a control unit, a first 5G module, a second 5G module and a router.

[0005] The first station control layer network interface and the first 5G module further comprise a quantum encryption module, which is used for quantum encryption of information reported to the power distribution automation system.

[0006] The technical solution adopted by the present application to solve its technical problem is to provide a power distribution network intelligent distributed feeder automation system containing network elements, which comprises the above-mentioned distributed intelligent power distribution terminal.

[0007] The primary and secondary fusion circuit breaker complete equipment comprises a circuit breaker and a power supply voltage transformer, the power supply voltage transformer is connected with the distributed intelligent power distribution terminal through a first aviation plug, and the circuit breaker is connected with the distributed intelligent power distribution terminal through a second aviation plug.

[0008] The technical solution adopted by the present application to solve its technical problem is to provide a power distribution network intelligent distributed feeder automation system containing network elements, which comprises the above-mentioned distributed intelligent power distribution terminal. (1) reading the topological connection relationship left vector TPZ and the topological connection relationship right vector TPY of each switch; Among them, for the first A switch, whose topological connection left vector , The definition is as follows: ; For the A switch, whose topological connection right vector , The definition is as follows: ; The number of switches; (2) Detect the three-phase current of each switch. Line voltage Zero-sequence current Zero-sequence voltage And determine the protection status flag bit of each switch; Among them, the The protection status flag bit of each switch The definition is as follows: , This is the fault current setting value; (3) Each switch sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches, and at the same time receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag of other switches in the neighborhood. (4) For each switch, based on the left vector TPZ and right vector TPY of the topological connection relationship between it and other switches in its neighborhood, and the protection status flag, construct the left vector DZY and right vector DZY of the switch action condition. Among them, the The left vector of the switch action condition , The definition is as follows: ; Among them, the The right vector of the switch action condition , The definition is as follows: ; (5) For each switch, if the sum of each element in the right vector DZY of the switch action condition is 1 and the sum of each element in the left vector DZZ of the switch action condition is greater than or equal to 1, or the sum of each element in the right vector DZY of the switch action condition is 0 and the sum of each element in the left vector DZZ of the switch action condition is 1, then the responding switch trips, disconnects the fault, and isolates the fault; if the conditions are not met, the switch remains unchanged. (6) Continue to check the undervoltage left flag, undervoltage right flag, and power flow direction flag of each switch; Among them, the Power flow direction flag of each switch The definition is as follows: ; No. The left-side flag of the switch is undervoltage. and the right depressurization flag They are defined as follows: ; ; (7) If the sum of each element in the left vector of the topological connection relationship of any switch is 1 and the undervoltage left flag bit is true. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has network construction capability, proceed to step (8); if the distributed power supply branch does not have network construction capability, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is 1 and the undervoltage left flag bit is 0. 0, right flag indicating loss of pressure If the value is 1, it is determined that the main line is faulty and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is equal to 1 and the undervoltage left flag bit is set. 0, right flag indicating loss of pressure The sum of each element in the right vector of the topological connection relationship of the switch is 1, and the undervoltage left flag is also 1. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (13); if the sum of each element in the right vector of the topology connection relationship of any switch is 1 and the undervoltage left flag bit is 0, then the branch line fault is determined to be a branch line fault, and ... 1. Right depressurization flag If the value is 0, it is determined to be a branch line fault, the corresponding switch trips, and proceeds to step (13); (8) For each switch, based on the left vector TPZ and right vector TPY of the topological connection relationship between it and other switches in its neighborhood, the power flow direction flag, the left flag of undervoltage and the right flag of undervoltage, construct the left vector DZDGZ and right vector DZDGY of the operation condition of the distributed power source off-grid operation switch. Among them, the The left vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: ; Among them, the The right vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: ; (9) For the first For each switch, if the sum of each element in the left vector DZDGZ of the distributed power source off-grid operation switch action condition is greater than or equal to 1, and the sum of each element in the left vector DZDGY of the distributed power source off-grid operation switch action condition is 0, and the switch undervoltage left flag bit... 0, right flag indicating loss of pressure If it is 0, then the first Individual switches trip in response, and regional distributed power sources and loads operate in an off-grid network configuration. (10) The tie switch detects its undervoltage left flag and undervoltage right flag. If the undervoltage left flag is 0, the undervoltage right flag is 1, and the protection status flag of its neighboring area is 0, then the tie switch is closed to restore power supply to the healthy area downstream of the fault section. (11) After a delay of X1 seconds, each switch will send its status information to the main station and set the relevant flags of each switch to their positions. (12) After a delay of 2 seconds, each switch sends its status information to the main station. The main station calculates that if the distributed power supply extension branch is not connected to the fault section, it remotely closes the distributed power supply connection branch switch to transfer the distributed power supply and its load to the main circuit for power supply, thus breaking away from the microgrid mode; if the distributed power supply extension branch is connected to the fault section, the distributed power supply connection branch keeps the switch open. (13) After a delay of 3 seconds, the switch meets the following condition: the left flag of the voltage loss is activated. 1. Right depressurization flag If the value is 0 and the conditions of step (5) are met, the first reclosing will be performed. If no fault current is detected, the fault is an instantaneous fault. The protection status flag will be set to 0 and the switch will be closed. If the fault current is still detected, the protection status flag will be set to 1 and the switch will be opened and locked. (14) Each switch sends its status information to the main station and sets the relevant flags of each switch.

[0009] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-mentioned intelligent distributed feeder automation method.

[0010] The technical solution adopted by the present invention to solve its technical problem is: to provide a computer-readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the above-mentioned intelligent distributed feeder automation method.

[0011] Beneficial effects By adopting the above-mentioned technical solution, this invention has the following advantages and positive effects compared with the prior art: This invention simultaneously meets the local control requirements of intelligent distributed feeder automation and the monitoring requirements of distribution automation master station, realizes an economical and efficient intelligent distributed feeder terminal design, provides a terminal equipment foundation for the realization of intelligent distributed feeder automation, and will help the application of intelligent distributed feeder automation in distribution lines containing distributed power sources. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the distributed intelligent power distribution terminal according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the intelligent distributed feeder automation system according to the second embodiment of the present invention; Figure 3 This is a schematic diagram of a primary and secondary integrated circuit breaker assembly according to the second embodiment of the present invention; Figure 4 This is a simplified topology diagram of a 10kV overhead power distribution line in an embodiment of the present invention; Figure 5 This is a schematic diagram of substation outgoing line fault handling in an embodiment of the present invention; Figure 6 This is a schematic diagram of trunk line short-circuit fault handling in an embodiment of the present invention; Figure 7 This is a schematic diagram of branch short-circuit fault handling in an embodiment of the present invention; Figure 8 This is a schematic diagram of short-circuit fault handling at the end of a branch line in an embodiment of the present invention. Detailed Implementation

[0013] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0014] The first embodiment of the present invention relates to a distributed intelligent power distribution terminal, such as... Figure 1 As shown, it includes a control unit, a first 5G module, a second 5G module, and a router.

[0015] The control unit is the core of the distributed intelligent power distribution terminal, including a first station control layer network interface, a second station control layer network interface, and a process layer network interface. The first station control layer network interface is connected to the first 5G module, which establishes a communication link with the power distribution automation system to transmit remote control, telemetry, and remote sensing data (using the 104 protocol). The second station control layer network interface is connected to the second 5G module, which in turn is connected to the router. The router is connected to the process layer network interface. The second 5G module and the router form a 5G wireless private network, enabling communication links with other distributed intelligent power distribution terminals. Peer-to-peer communication among the distributed intelligent power distribution terminals is achieved through this 5G wireless private network. Data exchange between the distributed intelligent power distribution terminals uses GOOSE transmission to realize distributed feeder automation functions. The 5G wireless private network also communicates with the equipment management and operation simulation server to realize functions such as topology configuration, parameter backup, intelligent replacement management, status detection, and simulation management. The protocol type is 104.

[0016] In this embodiment, a quantum encryption module is also included between the first station control layer network interface and the first 5G module. The quantum encryption module is used to perform quantum encryption on the information reported to the distribution automation system. In this embodiment, the first 5G module and the second 5G module are independent, simultaneously meeting the requirements of local control of intelligent distributed feeder automation and monitoring of the distribution automation master station.

[0017] The second embodiment of the present invention relates to a smart distributed feeder automation system for distribution networks containing network elements, such as... Figure 2As shown, the system includes several distributed intelligent distribution terminals according to a first embodiment. Each distributed intelligent distribution terminal constitutes a complete set of primary and secondary integrated circuit breakers and establishes a communication link with the distribution automation system through its respective first 5G module to achieve automatic coordinated operation. The distributed intelligent distribution terminals communicate with each other through the 5G wireless private network. Utilizing peer-to-peer communication technology, the terminals exchange data via Goose to achieve rapid fault location, isolation, and power restoration in non-faulty areas of the power supply network. The intelligent distributed feeder automation system of this embodiment constructs two independent communication networks to realize master station monitoring and scheduling and peer-to-peer communication between devices to support intelligent distributed feeder automation.

[0018] like Figure 3 As shown, the integrated primary and secondary circuit breaker assembly in this embodiment includes a circuit breaker and a power supply voltage transformer. The power supply voltage transformer is connected to the distributed intelligent power distribution terminal via a first aviation connector, and the circuit breaker is connected to the distributed intelligent power distribution terminal via a second aviation connector. The power supply for this integrated primary and secondary circuit breaker assembly is AC220V, drawn from the voltage transformer. UO uses an electronic sensor type, while the others use electromagnetic transformer types. The acquired quantities include Uab, Ubc, U0 (measurement, metering) voltage signals, and Ia, Ib, Ic, I0 (protection, measurement, metering) current signals. Control and remote signaling use DC24V, with a backup power supply configured.

[0019] The third embodiment of the present invention relates to an intelligent distributed feeder automation method, which adopts the intelligent distributed feeder automation system of the second embodiment. In use, the primary and secondary integrated circuit breaker assembly is installed on each switch on the distribution line, specifically including the following steps: (1) Read the left vector TPZ and right vector TPY of the topology connection relationship for each switch (i.e., the distributed intelligent power distribution terminal). In this embodiment, the direction from the power source to the load is taken as the positive direction. If there are N switches in a 10 kV power distribution line, then the left vector TPZ and right vector TPY of the topology connection relationship for each switch on the power distribution line are both N-dimensional row vectors.

[0020] For the A switch, whose topological connection left vector , The definition is as follows: ; For the A switch, whose topological connection right vector , The definition is as follows: .

[0021] (2) Detect the three-phase current of each switch. Line voltage Zero-sequence current Zero-sequence voltage And determine the protection status flag bit of each switch.

[0022] Among them, the The protection status flag bit of each switch The definition is as follows: , This is the fault current setting value.

[0023] (3) Each switch sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches, and at the same time receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag of other switches in the neighborhood.

[0024] (4) For each switch, based on the left vector TPZ and the right vector TPY of the topological connection relationship between it and other switches in its neighborhood, and the protection status flag, construct the left vector DZY of the switch action condition and the right vector DZY of the switch action condition.

[0025] Among them, the The left vector of the switch action condition , The definition is as follows: ; Among them, the The right vector of the switch action condition , The definition is as follows: .

[0026] (5) For each switch, if the sum of each element in the right vector DZY of the switch action condition is 1 (i.e. And the switching action condition is that the sum of each element in the left vector DZZ is greater than or equal to 1 (i.e., ), or the sum of each element in the right vector DZY is 0 (i.e., the switch action condition). And the sum of each element in the left vector DZZ, which is the switch action condition, is 1 (i.e. If the condition is met, the switch will trip, disconnect the fault, and isolate the fault; if the condition is not met, the switch will remain in its original state.

[0027] (6) The switches continue to monitor their respective undervoltage left flag, undervoltage right flag, and power flow direction flag.

[0028] Among them, the Power flow direction flag of each switch The definition is as follows: ; Among them, the The left-side flag of the switch is undervoltage. and the right depressurization flag They are defined as follows: ; .

[0029] (7) If the sum of each element in the left vector of the topological connection relationship of any switch is 1 and the undervoltage left flag bit is true. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has network construction capability, proceed to step (8); if the distributed power supply branch does not have network construction capability, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is 1 and the undervoltage left flag bit is 0. 0, right flag indicating loss of pressure If the value is 1, it is determined that the main line is faulty and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is equal to 1 and the undervoltage left flag bit is set. 0, right flag indicating loss of pressure The sum of each element in the right vector of the topological connection relationship of the switch is 1, and the undervoltage left flag is also 1. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (13); if the sum of each element in the right vector of the topology connection relationship of any switch is 1 and the undervoltage left flag bit is 0, then the branch line fault is determined to be a branch line fault, and ... 1. Right depressurization flag If the value is 0, it is determined to be a branch line fault, the corresponding switch trips, and proceeds to step (13).

[0030] (8) For each switch, based on the left vector TPZ and right vector TPY of the topological connection relationship between it and other switches in its neighborhood, the power flow direction flag, the left flag of undervoltage and the right flag of undervoltage, construct the left vector DZDGZ and right vector DZDGY of the off-grid operation conditions of the distributed power source.

[0031] Among them, the The left vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: ; Among them, the The right vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: .

[0032] (9) For the first If the sum of each element in the left vector DZDGZ of the distributed power source's off-grid operation switching condition is greater than or equal to 1 (i.e., ... The off-grid operation switching condition for distributed power sources requires the sum of each element in the left vector DZDGY to be 0 (i.e., ), and the switch undervoltage left flag. 0, right flag indicating loss of pressure If it is 0, then the first The individual switches tripped in response, and the regional distributed power supply and loads operated off-grid.

[0033] (10) The tie switch detects its undervoltage left flag and undervoltage right flag. If the undervoltage left flag is 0, the undervoltage right flag is 1, and the protection status flag of its neighboring area is 0, then the tie switch is closed to restore power supply to the healthy area downstream of the fault section. (11) Delay for X1 seconds (generally X1=2s), each switch will send the status information to the main station, and the relevant flags of each switch will be set. (12) Delay for 2 seconds (generally 2 = 5 seconds), each switch sends the status information to the master station. The master station calculates that if the distributed power supply extension branch is not connected to the fault section, the distributed power supply connection branch switch is closed remotely to transfer the distributed power supply and its load to the main circuit for power supply, thus leaving the microgrid mode; if the distributed power supply extension branch is connected to the fault section, the distributed power supply connection branch switch remains open. (13) Delay for 3 seconds (generally X3=5s), the switch meets the following condition: the left flag of the voltage loss is activated. 1. Right depressurization flag If the value is 0 and the conditions of step (5) are met, the first reclosing will be performed. If no fault current is detected, the fault is an instantaneous fault. The protection status flag will be set to 0 and the switch will be closed. If the fault current is still detected, the protection status flag will be set to 1 and the switch will be opened and locked. (14) Each switch sends its status information to the main station and sets the relevant flags of each switch.

[0034] (15) All processes are complete.

[0035] by Figure 4 Taking the simplified topology and power flow diagram of a typical overhead power distribution line as an example, each distributed power source in the diagram has the ability to form a network and the ability to ride through low voltage, the above-mentioned intelligent distributed feeder automation method is explained. Figure 4 In this circuit, main line switches S1, S2, S3, and S4, branch line switches S6, S7, S8, S9, and S10 are all equipped with distributed power assistance (FA) functions. Branch line switch S7 is equipped with conventional overcurrent protection to achieve tripping during end-point faults. Main line switch S1 is the first switch out of the substation and is equipped with undervoltage tripping function, with the undervoltage tripping delay avoiding the reclosing time of the substation outgoing line. Branch line switches S6, S7, and S10 are equipped with single-closing function to restore power supply after a momentary fault on the branch line. Interconnecting switch S5 is equipped with interconnecting self-healing function to restore power supply to non-faulty areas after a fault, with the self-healing action time avoiding the reclosing time of the substation outgoing line.

[0036] like Figure 5 As shown, if a fault occurs between the substation outlet and switch S1, the fault handling procedure is as follows: (1) Read the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal). Taking the direction from the power source to the load as the positive direction, there are 10 switches in this 10 kV distribution line. Therefore, the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal) on the distribution line are 10-dimensional row vectors.

[0037] Switch S1 contains itself on the left, and its topological connection left vector TPZ1=[1,0,0,0,0,0,0,0,0,0]; Switch S1 contains itself S1 and S2, S6 on the right, and its topological connection right vector TPY1=[1,1,0,0,0,1,0,0,0,0].

[0038] Switch S2 contains itself S2 and S1, S6 to the left, and its topological connection left vector TPZ2=[1,1,0,0,0,1,0,0,0,0]; switch S2 contains itself S2 and S3, S8 to the right, and its topological connection right vector TPY2=[0,1,1,0,0,0,0,1,0,0].

[0039] Switch S3 contains itself S3 and S2 and S8 to its left, and its topological connection left vector TPZ3=[0,1,1,0,0,0,0,1,0,0]; switch S3 contains itself S3 and S4 to its right, and its topological connection right vector TPY3=[0,0,1,1,0,0,0,0,0,0].

[0040] Switch S4 contains itself S4 and S3 to its left, and its topological connection left vector TPZ4=[0,0,1,1,0,0,0,0,0,0]; switch S4 contains itself S4 and S5, S9, S10 to its right, and its topological connection right vector TPY4=[0,0,0,1,1,0,0,0,1,1].

[0041] The left side of switch S5 contains itself S5 and S4, S9, and S10, and its topological connection left vector TPZ5=[0,0,0,1,1,0,0,0,1,1]; the right side of switch S5 contains itself S5, and its topological connection right vector TPY5=[0,0,0,0,1,0,0,0,0,0].

[0042] Switch S6 contains itself S6 and S1 and S2 to its left, and its topological connection left vector TPZ6=[1,1,0,0,0,1,0,0,0,0]; switch S6 contains itself S6 and S7 to its right, and its topological connection right vector TPY6=[0,0,0,0,0,1,1,0,0,0].

[0043] Switch S7 contains itself S7 and S6 to its left, and its topological connection left vector TPZ7=[0,0,0,0,0,1,1,0,0,0]; switch S7 contains itself S7 to its right, and its topological connection right vector TPY7=[0,0,0,0,0,0,1,0,0,0].

[0044] Switch S8 contains itself S8 and S2 and S3 to its left, and its topological connection left vector TPZ8=[0,1,1,0,0,0,0,1,0,0]; switch S8 contains itself S8 to its right, and its topological connection right vector TPY8=[0,0,0,0,0,0,0,1,0,0].

[0045] Switch S9 contains itself S9 and S4, S5, and S10 to its left, and its topological connection left vector TPZ9=[0,0,0,1,1,0,0,0,1,1]; switch S9 contains itself S9 to its right, and its topological connection right vector TPY9=[0,0,0,0,0,0,0,0,1,0].

[0046] The left side of switch S10 contains itself S10 and S4, S5, and S9, and their topological connection relationship is represented by the left vector TPZ.10 =[0,0,0,1,1,0,0,0,1,1]; Switch S10 contains itself on the right, and its topological connection right vector TPY 10 =[0,0,0,0,0,0,0,0,0,1].

[0047] (2) Detect the three-phase current I of each switch (distributed intelligent distribution terminal). a I b I c Line voltage U ac U bc Zero-sequence current I0, zero-sequence voltage U0, and the protection status flag bit for each switch.

[0048] The protection status flag c1 of switch S1 is 0; The protection status flag c2 of switch S2 is 0; The protection status flag c3 of switch S3 is 0; The protection status flag c4 of switch S4 is 0; The protection status flag c5 of switch S5 is 0; The protection status flag c6 of switch S6 is 0; The protection status flag c7 of switch S7 is 0; The protection status flag c8 of switch S8 is 0; The protection status flag c9 of switch S9 is 0; Protection status flag c of switch S10 10 It is 0.

[0049] (3) Each switch (distributed intelligent distribution terminal) sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches (distributed intelligent distribution terminals), and receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag from other terminals in the neighborhood.

[0050] (4) For each switch (distributed intelligent distribution terminal), construct the left vector TPZ and right vector TPY of the topological connection relationship between it and other terminals in its neighborhood, and the protection status flag bit.

[0051] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the value of protection status flag c is 0; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the value of protection status flag c is 0, 0, 0. Therefore, DZZ1=[0,0,0,0,0,0,0,0,0,0], DZY1=[0,0,0,0,0,0,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0. Therefore, DZZ2=[0,0,0,0,0,0,0,0,0,0], DZY2=[0,0,0,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0. Therefore, DZZ3=[0,0,0,0,0,0,0,0,0,0], DZY3=[0,0,0,0,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0. Therefore, DZZ4=[0,0,0,0,0,0,0,0,0,0], DZY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of protection status flag c is 0. Therefore, DZZ5=[0,0,0,0,0,0,0,0,0,0], DZY5=[0,0,0,0,0,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of protection status flag c is 0, 0. Therefore, DZZ6=[0,0,0,0,0,0,0,0,0,0], DZY6=[0,0,0,0,0,0,0,0,0,0].

[0052] For switch S7, according to the left vector TPZ of the topological connection, which includes switches S6 and S7, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection, which includes switch S7, the value of protection status flag c is 0. Therefore, DZZ7=[0,0,0,0,0,0,0,0,0,0], DZY7=[0,0,0,0,0,0,0,0,0,0].

[0053] For switch S8, according to the left vector TPZ of the topological connection, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection, which includes switch S8, the value of protection status flag c is 0. Therefore, DZZ8=[0,0,0,0,0,0,0,0,0,0], DZY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of protection status flag c is 0. Therefore, DZZ9=[0,0,0,0,0,0,0,0,0,0], DZY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the protection status flag c has a value of 0, 0, 0, 0; according to the right vector TPY of the topology connection, which includes switch S10, the protection status flag c has a value of 0. Therefore, DZZ 10 =[0,0,0,0,0,0,0,0,0,0],DZY 10 =[0,0,0,0,0,0,0,0,0,0,0].

[0054] (5) For a switch, if the switch action condition right vector DZY And the left vector DZZ of the switch action condition Or the right vector DZY of the switch action condition. And the left vector DZZ of the switch action condition If the condition is not met, the switch will trip, clear the fault, and isolate the fault; if the condition is not met, the switch will remain in its original state.

[0055] For switch S1, the right vector DZY1 of the switch action condition... And the left vector DZZ1 of the switch action condition The tripping conditions are not met.

[0056] For switch S2, the right vector of the switch action condition is DZY2. And the left vector DZZ2 of the switch action condition The tripping conditions are not met.

[0057] For switch S3, the right vector of the switch action condition is DZY3. And the left vector DZZ3 of the switch action condition The tripping conditions are not met.

[0058] For switch S4, the right vector of the switch action condition is DZY4. And the left vector DZZ4 is the condition for the switch action. The tripping conditions are not met.

[0059] For switch S5, the right vector of the switch action condition is DZY5. And the left vector DZZ5 is the switch action condition. The tripping conditions are not met.

[0060] For switch S6, the right vector of the switch action condition is DZY6. And the left vector of the switch action condition, DZZ6 The tripping conditions are not met.

[0061] For switch S7, the right vector of the switch action condition is DZY7. And the left vector of the switch action condition is DZZ7 The tripping conditions are not met.

[0062] For switch S8, the right vector of the switch action condition is DZY8. And the left vector of the switch action condition, DZZ8 The tripping conditions are not met.

[0063] For switch S9, the right vector of the switch action condition is DZY9. And the left vector of the switch action condition DZZ9 The tripping conditions are not met.

[0064] For switch S10, the right vector of the switch action condition is DZY. 10 of And the left vector of the switch action condition is DZZ 10 of The tripping conditions are not met.

[0065] Since none of the switches meet the tripping conditions, the switches remain in their original state.

[0066] (6) The switches continue to monitor their respective undervoltage flag and power flow direction flag. The substation tripped due to an outlet fault, resulting in a complete loss of power to the entire line.

[0067] The power flow direction flag d1 of switch S1 is 1, the left undervoltage flag ez1 is 0, and the right undervoltage flag ey1 is 0.

[0068] The power flow direction flag d2 of switch S2 is 1, the left undervoltage flag ez2 is 0, and the right undervoltage flag ey2 is 0.

[0069] The power flow direction flag d3 of switch S3 is 1, the left undervoltage flag ez3 is 0, and the right undervoltage flag ey3 is 0.

[0070] The power flow direction flag d4 of switch S4 is 1, the left undervoltage flag ez4 is 0, and the right undervoltage flag ey4 is 0.

[0071] The power flow direction flag d5 of switch S5 is 1, the left undervoltage flag ez5 is 0, and the right undervoltage flag ey5 is 1.

[0072] The power flow direction flag d6 of switch S6 is 1, the left undervoltage flag ez6 is 0, and the right undervoltage flag ey6 is 0.

[0073] The power flow direction flag d7 of switch S7 is 1, the left undervoltage flag ez7 is 0, and the right undervoltage flag ey7 is 0.

[0074] The power flow direction flag d8 of switch S8 is 0, the undervoltage left flag ez8 is 0, and the undervoltage right flag ey8 is 0.

[0075] The power flow direction flag d9 of switch S9 is 0, the undervoltage left flag ez9 is 0, and the undervoltage right flag ey9 is 0.

[0076] Power flow direction flag bit d of switch S10 10 The value is 1, the left flag ez10 for the pressure loss is 0, and the right flag ey10 for the pressure loss is 0.

[0077] (7) If the sum of the left vector elements of the topology connection relationship of any switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, then it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection relationship of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a main line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if it does not have the ability to form a network, proceed to step (13). If the sum of the right vector elements of the topology connection of any switch is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, then it is determined to be a branch line fault, the corresponding switch has tripped, and proceed to step (13).

[0078] If the sum of the left vector elements of the topological connection relationship of switch S1 is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, it is determined to be a substation outgoing line fault. The distributed power supply branch has the network construction capability and proceeds to step (8).

[0079] (8) For each switch (distributed intelligent distribution terminal), based on its topological connection relationship with other terminals in its neighborhood, the left vector TPZ and the right vector TPY, the power flow direction flag d, the undervoltage left flag ez, and the undervoltage right flag ey, construct the distributed power source off-grid operation switch action condition left vector DZDGZ and right vector DZDGY.

[0080] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the power flow direction flag d is 1; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the values ​​of the power flow direction flag d are 1, 1, and 1, respectively. Therefore, DZDGZ1=[1,0,0,0,0,0,0,0,0,0], DZDGY1=[1,1,0,0,0,1,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of the power flow direction flag d is 1, 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, 0. Therefore, DZDGZ2=[1,1,0,0,0,1,0,0,0,0], DZDGY2=[0,1,1,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, and 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of the power flow direction flag d is 1 and 1. Therefore, DZDGZ3=[0,1,1,0,0,0,0,0,0,0], DZDGY3=[0,0,1,1,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of the power flow direction flag d is 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1. Therefore, DZDGZ4=[0,0,0,0,0,0,0,0,0,0], DZDGY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of the power flow direction flag d is 1. Therefore, DZDGZ5=[0,0,0,1,1,0,0,0,1,1], DZDGY5=[0,0,0,0,1,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of the power flow direction flag d is 1, 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of the power flow direction flag d is 1, 1. Therefore, DZDGZ6=[1,1,0,0,0,1,0,0,0,0], DZDGY6=[0,0,0,0,0,1,1,0,0,0].

[0081] For switch S7, according to the left vector TPZ of the topology connection, which includes switches S6 and S7, the value of the power flow direction flag d is 1, 1; according to the right vector TPY of the topology connection, which includes switch S7, the value of the power flow direction flag d is 1. Therefore, DZDGZ4=[0,0,0,0,0,1,1,0,0,0], DZDGY4=[0,0,0,0,0,0,1,0,0,0].

[0082] For switch S8, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, and 0, respectively; according to the right vector TPY of the topological connection relationship, which includes switch S8, the value of the power flow direction flag d is 0. Therefore, DZDGZ8=[0,1,1,0,0,0,0,0,0,0], DZDGY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of the power flow direction flag d is 0. Therefore, DZDGZ9=[0,0,0,1,1,0,0,0,0,0], DZDGY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the power flow direction flag d has values ​​of 1, 1, 0, and 1 respectively; according to the right vector TPY of the topology connection, which includes switch S10, the power flow direction flag d has a value of 1. Therefore, DZDGZ 10 =[0,0,0,1,1,0,0,0,1,1],DZDGY 10 =[0,0,0,0,0,0,0,0,0,1].

[0083] (9) For switch i, if the left vector DZDGZ of the off-grid operation switch action condition of the distributed power source is... The right vector DZDGY is the switching action condition for off-grid operation of distributed power sources. If the left flag bit ez is 0 and the right flag bit ey is 0 when the switch is under pressure, then switch i will trip in response, and the regional distributed power supply and load will operate in an off-grid network.

[0084] For switch S1, the left vector DZDGZ1 is the switching action condition for the distributed power source operating off-grid. Furthermore, the right vector DZDGY1 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez1 is 0, and the right depressurization flag ey1 is 0; the action condition is not met.

[0085] For switch S2, the left vector DZDGZ2 is the switching action condition for the distributed power source operating off-grid. Furthermore, the right vector DZDGY2 is the switching action condition for the off-grid operation of distributed power sources. The left depressurization flag ez2 is 0, and the right depressurization flag ey2 is 0; the action condition is not met.

[0086] For switch S3, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ3. Furthermore, the right vector DZDGY3 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez3 is 0, and the right depressurization flag ey3 is 0, so the action condition is not met.

[0087] For switch S4, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ4. Furthermore, the right vector DZDGY4 is the operating condition for the off-grid operation of distributed power sources. The left flag ez4 for undervoltage is 0, and the right flag ey4 for undervoltage is 0; the tripping condition is not met.

[0088] For switch S5, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ5. Furthermore, the right vector DZDGY5 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez5 is 0, and the right depressurization flag ey5 is 1 ≠ 0; the action condition is not met.

[0089] For switch S6, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ6. Furthermore, the right vector DZDGY6 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez6 is 0, and the right depressurization flag ey6 is 0; the action condition is not met.

[0090] For switch S7, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ7. Furthermore, the right vector of the off-grid operation switch action condition for distributed power sources is DZDGY7. The left depressurization flag ez7 is 0, and the right depressurization flag ey7 is 0; the action condition is not met.

[0091] For switch S8, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ8. Furthermore, the right vector DZDGY8 is the operating condition for the off-grid operation of distributed power sources. The left flag ez8 for undervoltage is 0, and the right flag ey8 for undervoltage is 0; the tripping condition is met.

[0092] For switch S9, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ9. Furthermore, the right vector DZDGY9 is the operating condition for the off-grid operation of distributed power sources. The left flag ez9 for undervoltage is 0, and the right flag ey9 for undervoltage is 0; the tripping condition is met.

[0093] For switch S10, the left vector of the off-grid operation switch action condition for distributed power generation is DZDGZ. 10 of Furthermore, the right vector of the off-grid operation switch action condition for distributed power sources is DZDGY. 10 of The left depressurization flag ez10 is 0, and the right depressurization flag ey10 is 0; the action condition is not met.

[0094] Switches S8 and S9 trip when the operating conditions are met, while the other switches remain in their original state when the conditions are not met.

[0095] (10) At the same time, the tie switch detects its undervoltage flag. If its flag is 0 and 1, and its field is in protection status with flag c being 0, then the tie switch closes to restore power supply to the downstream healthy area of ​​the fault section.

[0096] S5 is satisfied, and the interconnecting switch is closed.

[0097] (11) After a delay of X1 seconds (generally X1=2s), each switch (distributed intelligent power distribution terminal) will send its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) will be set.

[0098] (12) After a delay of X2 seconds (generally X2=5s), each switch (distributed intelligent power distribution terminal) sends its status information to the master station. The master station calculates whether the distributed power supply extension branch is not connected to the fault section. If so, it remotely closes the distributed power supply connection branch switch to transfer the distributed power supply and its load to the main circuit, thus exiting the microgrid mode. If the distributed power supply extension branch is connected to the fault section, the distributed power supply connection branch switch remains open. For example, if the distributed power supply extension branches of switches S8 and S9 are not connected to the fault section, S8 and S9 are closed.

[0099] (13) Delay for X3 seconds (generally X3=5s), the switch meets the following conditions: the left undervoltage flag ez is 1, the right undervoltage flag ey is 0, and step (5) is met. For the first reclosing, if no fault current is detected, the fault is an instantaneous fault, the protection status flag c is 0, and the switch is closed; if the fault current is still detected, the protection status flag c is 1, the switch is opened and locked.

[0100] All switches are not satisfied, and there is no reclosing.

[0101] (14) Each switch (distributed intelligent power distribution terminal) sends its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) are set.

[0102] (15) All processes are complete.

[0103] Taking the above typical overhead power distribution line as an example again, such asFigure 6 As shown, a short circuit occurred in the main line, and a fault occurred in the upper half of the main line S2 and S3. The fault handling procedure is as follows: (1) Read the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal). Taking the direction from the power source to the load as the positive direction, there are 10 switches in this 10 kV distribution line. Therefore, the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal) on the distribution line are 10-dimensional row vectors.

[0104] Switch S1 contains itself on the left, and its topological connection left vector TPZ1=[1,0,0,0,0,0,0,0,0,0]; Switch S1 contains itself S1 and S2, S6 on the right, and its topological connection right vector TPY1=[1,1,0,0,0,1,0,0,0,0].

[0105] Switch S2 contains itself S2 and S1, S6 to the left, and its topological connection left vector TPZ2=[1,1,0,0,0,1,0,0,0,0]; switch S2 contains itself S2 and S3, S8 to the right, and its topological connection right vector TPY2=[0,1,1,0,0,0,0,1,0,0].

[0106] Switch S3 contains itself S3 and S2 and S8 to its left, and its topological connection left vector TPZ3=[0,1,1,0,0,0,0,1,0,0]; switch S3 contains itself S3 and S4 to its right, and its topological connection right vector TPY3=[0,0,1,1,0,0,0,0,0,0].

[0107] Switch S4 contains itself S4 and S3 to its left, and its topological connection left vector TPZ4=[0,0,1,1,0,0,0,0,0,0]; switch S4 contains itself S4 and S5, S9, S10 to its right, and its topological connection right vector TPY4=[0,0,0,1,1,0,0,0,1,1].

[0108] The left side of switch S5 contains itself S5 and S4, S9, and S10, and its topological connection left vector TPZ5=[0,0,0,1,1,0,0,0,1,1]; the right side of switch S5 contains itself S5, and its topological connection right vector TPY5=[0,0,0,0,1,0,0,0,0,0].

[0109] Switch S6 contains itself S6 and S1 and S2 to its left, and its topological connection left vector TPZ6=[1,1,0,0,0,1,0,0,0,0]; switch S6 contains itself S6 and S7 to its right, and its topological connection right vector TPY6=[0,0,0,0,0,1,1,0,0,0].

[0110] Switch S7 contains itself S7 and S6 to its left, and its topological connection left vector TPZ7=[0,0,0,0,0,1,1,0,0,0]; switch S7 contains itself S7 to its right, and its topological connection right vector TPY7=[0,0,0,0,0,0,1,0,0,0].

[0111] Switch S8 contains itself S8 and S2 and S3 to its left, and its topological connection left vector TPZ8=[0,1,1,0,0,0,0,1,0,0]; switch S8 contains itself S8 to its right, and its topological connection right vector TPY8=[0,0,0,0,0,0,0,1,0,0].

[0112] Switch S9 contains itself S9 and S4, S5, and S10 to its left, and its topological connection left vector TPZ9=[0,0,0,1,1,0,0,0,1,1]; switch S9 contains itself S9 to its right, and its topological connection right vector TPY9=[0,0,0,0,0,0,0,0,1,0].

[0113] The left side of switch S10 contains itself S10 and S4, S5, and S9, and their topological connection relationship is represented by the left vector TPZ. 10 =[0,0,0,1,1,0,0,0,1,1]; Switch S10 contains itself on the right, and its topological connection right vector TPY 10 =[0,0,0,0,0,0,0,0,0,1].

[0114] (2) Detect the three-phase current I of each switch (distributed intelligent distribution terminal). a I b I c Line voltage U ac U bc Zero-sequence current I0, zero-sequence voltage U0, and the protection status flag bit for each switch.

[0115] A fault occurred in the upper half of the main lines S2 and S3. The protection status flag c1 of switch S1 is 1; The protection status flag c2 of switch S2 is 1; The protection status flag c3 of switch S3 is 0; The protection status flag c4 of switch S4 is 0; The protection status flag c5 of switch S5 is 0; The protection status flag c6 of switch S6 is 0; The protection status flag c7 of switch S7 is 0; The protection status flag c8 of switch S8 is 0; The protection status flag c9 of switch S9 is 0; Protection status flag c of switch S10 10 It is 0.

[0116] (3) Each switch (distributed intelligent distribution terminal) sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches (distributed intelligent distribution terminals), and receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag from other terminals in the neighborhood.

[0117] (4) For each switch (distributed intelligent distribution terminal), construct the left vector TPZ and right vector TPY of the topological connection relationship between it and other terminals in its neighborhood, and the protection status flag bit.

[0118] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the protection status flag c has a value of 1; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the protection status flag c has values ​​of 1, 1, and 0, respectively. Therefore, DZZ1=[1,0,0,0,0,0,0,0,0,0], DZY1=[1,1,0,0,0,0,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 1, and 0; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 1, 0, and 0. Therefore, DZZ2=[1,1,0,0,0,0,0,0,0,0], DZY2=[0,1,0,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 1, 0, and 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0 and 0. Therefore, DZZ3=[0,1,0,0,0,0,0,0,0,0], DZY3=[0,0,0,0,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0. Therefore, DZZ4=[0,0,0,0,0,0,0,0,0,0], DZY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of protection status flag c is 0. Therefore, DZZ5=[0,0,0,0,0,0,0,0,0,0], DZY5=[0,0,0,0,0,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 1, and 0; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of protection status flag c is 0 and 0. Therefore, DZZ6=[1,1,0,0,0,0,0,0,0,0], DZY6=[0,0,0,0,0,0,0,0,0,0].

[0119] For switch S7, according to the left vector TPZ of the topological connection, which includes switches S6 and S7, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection, which includes switch S7, the value of protection status flag c is 0. Therefore, DZZ7=[0,0,0,0,0,0,0,0,0,0], DZY7=[0,0,0,0,0,0,0,0,0,0].

[0120] For switch S8, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 1, 0, and 0; according to the right vector TPY of the topological connection relationship, which includes switch S8, the value of protection status flag c is 0. Therefore, DZZ8=[0,1,0,0,0,0,0,0,0,0], DZY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of protection status flag c is 0. Therefore, DZZ9=[0,0,0,0,0,0,0,0,0,0], DZY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the protection status flag c has a value of 0, 0, 0, 0; according to the right vector TPY of the topology connection, which includes switch S10, the protection status flag c has a value of 0. Therefore, DZZ 10 =[0,0,0,0,0,0,0,0,0,0],DZY 10 =[0,0,0,0,0,0,0,0,0,0,0].

[0121] (5) For a switch, if the switch action condition right vector DZY And the left vector DZZ of the switch action condition Or the right vector DZY of the switch action condition. And the left vector DZZ of the switch action condition If the condition is not met, the switch will trip, clear the fault, and isolate the fault; if the condition is not met, the switch will remain in its original state.

[0122] For switch S1, the right vector DZY1 of the switch action condition... And the left vector DZZ1 of the switch action condition The tripping conditions are not met.

[0123] For switch S2, the right vector of the switch action condition is DZY2. And the left vector DZZ2 of the switch action condition The tripping conditions are met.

[0124] For switch S3, the right vector of the switch action condition is DZY3. And the left vector DZZ3 of the switch action condition The tripping conditions are met.

[0125] For switch S4, the right vector of the switch action condition is DZY4. And the left vector DZZ4 is the condition for the switch action. The tripping conditions are not met.

[0126] For switch S5, the right vector of the switch action condition is DZY5. And the left vector DZZ5 is the switch action condition. The tripping conditions are not met.

[0127] For switch S6, the right vector of the switch action condition is DZY6. And the left vector of the switch action condition, DZZ6 The tripping conditions are not met.

[0128] For switch S7, the right vector of the switch action condition is DZY7. And the left vector of the switch action condition is DZZ7 The tripping conditions are not met.

[0129] For switch S8, the right vector of the switch action condition is DZY8. And the left vector of the switch action condition, DZZ8 The tripping conditions are met.

[0130] For switch S9, the right vector of the switch action condition is DZY9. And the left vector of the switch action condition DZZ9 The tripping conditions are not met.

[0131] For switch S10, the right vector of the switch action condition is DZY. 10 of And the left vector of the switch action condition is DZZ 10 of The tripping conditions are not met.

[0132] Switches S2, S3, and S8 trip when the tripping conditions are met, while the remaining switches maintain their original state to isolate the fault.

[0133] (6) The switches detect their respective undervoltage flag and power flow direction flag. The power flow direction flag d1 of switch S1 is 1, the undervoltage left flag ez1 is 1, and the undervoltage right flag ey1 is 1.

[0134] The power flow direction flag d2 of switch S2 is 1, the left undervoltage flag ez2 is 1, and the right undervoltage flag ey2 is 0.

[0135] The power flow direction flag d3 of switch S3 is 1, the left undervoltage flag ez3 is 0, and the right undervoltage flag ey3 is 0.

[0136] The power flow direction flag d4 of switch S4 is 1, the left undervoltage flag ez4 is 0, and the right undervoltage flag ey4 is 0.

[0137] The power flow direction flag d5 of switch S5 is 1, the left undervoltage flag ez5 is 0, and the right undervoltage flag ey5 is 1.

[0138] The power flow direction flag d6 of switch S6 is 1, the undervoltage left flag ez6 is 1, and the undervoltage right flag ey6 is 1.

[0139] The power flow direction flag d7 of switch S7 is 1, the undervoltage left flag ez7 is 1, and the undervoltage right flag ey7 is 1.

[0140] The power flow direction flag d8 of switch S8 is 0, the undervoltage left flag ez8 is 0, and the undervoltage right flag ey8 is 0.

[0141] The power flow direction flag d9 of switch S9 is 0, the undervoltage left flag ez9 is 0, and the undervoltage right flag ey9 is 0.

[0142] Power flow direction flag bit d of switch S10 10 The value is 1, the left flag ez10 for the pressure loss is 0, and the right flag ey10 for the pressure loss is 0.

[0143] (7) If the sum of the left vector elements of the topology connection relationship of any switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, then it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection relationship of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a main line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if it does not have the ability to form a network, proceed to step (13). If the sum of the right vector elements of the topology connection of any switch is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, then it is determined to be a branch line fault, the corresponding switch has tripped, and proceed to step (13).

[0144] If the conditions of step (5) are met, and the sum of the right vector elements of the topological connection relationship of switch S5 is equal to 1, and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, it is determined that the main line is faulty. The distributed power supply branch has the ability to form a network and proceeds to step (8).

[0145] (8) For each switch (distributed intelligent distribution terminal), based on its topological connection relationship with other terminals in its neighborhood, the left vector TPZ and the right vector TPY, the power flow direction flag d, the undervoltage left flag ez, and the undervoltage right flag ey, construct the distributed power source off-grid operation switch action condition left vector DZDGZ and right vector DZDGY.

[0146] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the power flow direction flag d is 1; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the values ​​of the power flow direction flag d are 1, 1, and 1, respectively. Therefore, DZDGZ1=[1,0,0,0,0,0,0,0,0,0], DZDGY1=[1,1,0,0,0,1,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of the power flow direction flag d is 1, 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, 0. Therefore, DZDGZ2=[1,1,0,0,0,1,0,0,0,0], DZDGY2=[0,1,1,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, and 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of the power flow direction flag d is 1 and 1. Therefore, DZDGZ3=[0,1,1,0,0,0,0,0,0,0], DZDGY3=[0,0,1,1,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of the power flow direction flag d is 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1. Therefore, DZDGZ4=[0,0,0,0,0,0,0,0,0,0], DZDGY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of the power flow direction flag d is 1. Therefore, DZDGZ5=[0,0,0,1,1,0,0,0,1,1], DZDGY5=[0,0,0,0,1,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of the power flow direction flag d is 1, 1, 1; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of the power flow direction flag d is 1, 1. Therefore, DZDGZ6=[1,1,0,0,0,1,0,0,0,0], DZDGY6=[0,0,0,0,0,1,1,0,0,0].

[0147] For switch S7, according to the left vector TPZ of the topology connection, which includes switches S6 and S7, the value of the power flow direction flag d is 1, 1; according to the right vector TPY of the topology connection, which includes switch S7, the value of the power flow direction flag d is 1. Therefore, DZDGZ4=[0,0,0,0,0,1,1,0,0,0], DZDGY4=[0,0,0,0,0,0,1,0,0,0].

[0148] For switch S8, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of the power flow direction flag d is 1, 1, and 0, respectively; according to the right vector TPY of the topological connection relationship, which includes switch S8, the value of the power flow direction flag d is 0. Therefore, DZDGZ8=[0,1,1,0,0,0,0,0,0,0], DZDGY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of the power flow direction flag d is 1, 1, 0, 1; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of the power flow direction flag d is 0. Therefore, DZDGZ9=[0,0,0,1,1,0,0,0,0,0], DZDGY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the power flow direction flag d has values ​​of 1, 1, 0, and 1 respectively; according to the right vector TPY of the topology connection, which includes switch S10, the power flow direction flag d has a value of 1. Therefore, DZDGZ 10 =[0,0,0,1,1,0,0,0,1,1],DZDGY 10 =[0,0,0,0,0,0,0,0,0,1].

[0149] (9) For switch i, if the left vector DZDGZ of the off-grid operation switch action condition of the distributed power source is... The left vector DZDGY is the switching action condition for off-grid operation of distributed power sources. If the left flag bit ez is 0 and the right flag bit ey is 0 when the switch is under pressure, then switch i will trip in response, and the regional distributed power supply and load will operate in an off-grid network.

[0150] For switch S1, the left vector DZDGZ1 is the switching action condition for the distributed power source operating off-grid. Furthermore, the right vector DZDGY1 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez1 is 1≠0, and the right depressurization flag ey1 is 1≠0; the action condition is not met.

[0151] For switch S2, the left vector DZDGZ2 is the switching action condition for the distributed power source operating off-grid. Furthermore, the right vector DZDGY2 is the switching action condition for the off-grid operation of distributed power sources. The left depressurization flag ez2 is 1 ≠ 0, and the right depressurization flag ey2 is 0; the action condition is not met.

[0152] For switch S3, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ3. Furthermore, the right vector DZDGY3 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez3 is 0, and the right depressurization flag ey3 is 0, so the action condition is not met.

[0153] For switch S4, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ4. Furthermore, the right vector DZDGY4 is the operating condition for the off-grid operation of distributed power sources. The left flag ez4 for undervoltage is 0, and the right flag ey4 for undervoltage is 0; the tripping condition is not met.

[0154] For switch S5, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ5. Furthermore, the right vector DZDGY5 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez5 is 0, and the right depressurization flag ey5 is 1 ≠ 0; the action condition is not met.

[0155] For switch S6, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ6. Furthermore, the right vector DZDGY6 is the operating condition for the off-grid operation of distributed power sources. The left depressurization flag ez6 is 1≠0, and the right depressurization flag ey6 is 1≠0; the action condition is not met.

[0156] For switch S7, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ7. Furthermore, the right vector of the off-grid operation switch action condition for distributed power sources is DZDGY7. The left depressurization flag ez7 is 1≠0, and the right depressurization flag ey7 is 1≠0; the action condition is not met.

[0157] For switch S8, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ8. Furthermore, the right vector DZDGY8 is the operating condition for the off-grid operation of distributed power sources. The left flag ez8 for undervoltage is 0, and the right flag ey8 for undervoltage is 0; the tripping condition is met.

[0158] For switch S9, the left vector of the off-grid operation switch action condition for distributed power sources is DZDGZ9. Furthermore, the right vector DZDGY9 is the operating condition for the off-grid operation of distributed power sources. The left flag ez9 for undervoltage is 0, and the right flag ey9 for undervoltage is 0; the tripping condition is met.

[0159] For switch S10, the left vector of the off-grid operation switch action condition for distributed power generation is DZDGZ. 10 of Furthermore, the right vector of the off-grid operation switch action condition for distributed power sources is DZDGY. 10 of The left depressurization flag ez10 is 0, and the right depressurization flag ey10 is 0; the action condition is not met.

[0160] Switches S8 and S9 trip when the operating conditions are met. Since S8 has already tripped, it will not trip again. The other switches do not meet the conditions and remain in their original state.

[0161] (10) At the same time, the tie switch detects its undervoltage flag. If its flag is 0 and 1, and its field is in protection status with flag c being 0, then the tie switch closes to restore power supply to the downstream healthy area of ​​the fault section.

[0162] S5 is satisfied, and the interconnecting switch is closed.

[0163] (11) After a delay of X1 seconds (generally X1=2s), each switch (distributed intelligent power distribution terminal) will send its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) will be set.

[0164] (12) After a delay of X2 seconds (generally X2=5s), each switch (distributed intelligent power distribution terminal) sends the status information to the master station. The master station calculates that if the distributed power supply extension branch is not connected to the fault section, it remotely closes the distributed power supply connection branch switch. For example, if switch S9 is closed, the distributed power supply and its load are transferred to the main circuit for power supply, thus leaving the microgrid mode. If the distributed power supply extension branch is connected to the fault section, the distributed power supply connection branch keeps the switch open. For example, if switch S8 is kept open.

[0165] (13) Delay for X3 seconds (generally X3=5s), the switch meets the following conditions: the left undervoltage flag ez is 1, the right undervoltage flag ey is 0, and step (5) is met. For the first reclosing, if no fault current is detected, the fault is an instantaneous fault, the protection status flag c is 0, and the switch is closed; if the fault current is still detected, the protection status flag c is 1, the switch is opened and locked.

[0166] The undervoltage left flag ez2 of switch S2 is 1 and the undervoltage right flag ey2 is 0, and step (5) is satisfied, thus satisfying the condition; the reclosing detects the fault current, the protection status flag c is 1, and switch S2 is opened and locked.

[0167] (14) Each switch (distributed intelligent power distribution terminal) sends its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) are set.

[0168] (15) All processes are complete.

[0169] Taking the above typical overhead power distribution line as an example again, such as Figure 7 As shown, if a short circuit occurs in the branch line, such as a fault between branch line switch S6 and branch line switch S7, the fault handling procedure is as follows: (1) Read the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal). Taking the direction from the power source to the load as the positive direction, there are 10 switches in this 10 kV distribution line. Therefore, the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal) on the distribution line are 10-dimensional row vectors.

[0170] Switch S1 contains itself on the left, and its topological connection left vector TPZ1=[1,0,0,0,0,0,0,0,0,0]; Switch S1 contains itself S1 and S2, S6 on the right, and its topological connection right vector TPY1=[1,1,0,0,0,1,0,0,0,0].

[0171] Switch S2 contains itself S2 and S1, S6 to the left, and its topological connection left vector TPZ2=[1,1,0,0,0,1,0,0,0,0]; switch S2 contains itself S2 and S3, S8 to the right, and its topological connection right vector TPY2=[0,1,1,0,0,0,0,1,0,0].

[0172] Switch S3 contains itself S3 and S2 and S8 to its left, and its topological connection left vector TPZ3=[0,1,1,0,0,0,0,1,0,0]; switch S3 contains itself S3 and S4 to its right, and its topological connection right vector TPY3=[0,0,1,1,0,0,0,0,0,0].

[0173] Switch S4 contains itself S4 and S3 to its left, and its topological connection left vector TPZ4=[0,0,1,1,0,0,0,0,0,0]; switch S4 contains itself S4 and S5, S9, S10 to its right, and its topological connection right vector TPY4=[0,0,0,1,1,0,0,0,1,1].

[0174] The left side of switch S5 contains itself S5 and S4, S9, and S10, and its topological connection left vector TPZ5=[0,0,0,1,1,0,0,0,1,1]; the right side of switch S5 contains itself S5, and its topological connection right vector TPY5=[0,0,0,0,1,0,0,0,0,0].

[0175] Switch S6 contains itself S6 and S1 and S2 to its left, and its topological connection left vector TPZ6=[1,1,0,0,0,1,0,0,0,0]; switch S6 contains itself S6 and S7 to its right, and its topological connection right vector TPY6=[0,0,0,0,0,1,1,0,0,0].

[0176] Switch S7 contains itself S7 and S6 to its left, and its topological connection left vector TPZ7=[0,0,0,0,0,1,1,0,0,0]; switch S7 contains itself S7 to its right, and its topological connection right vector TPY7=[0,0,0,0,0,0,1,0,0,0].

[0177] Switch S8 contains itself S8 and S2 and S3 to its left, and its topological connection left vector TPZ8=[0,1,1,0,0,0,0,1,0,0]; switch S8 contains itself S8 to its right, and its topological connection right vector TPY8=[0,0,0,0,0,0,0,1,0,0].

[0178] Switch S9 contains itself S9 and S4, S5, and S10 to its left, and its topological connection left vector TPZ9=[0,0,0,1,1,0,0,0,1,1]; switch S9 contains itself S9 to its right, and its topological connection right vector TPY9=[0,0,0,0,0,0,0,0,1,0].

[0179] The left side of switch S10 contains itself S10 and S4, S5, and S9, and their topological connection relationship is represented by the left vector TPZ.10 =[0,0,0,1,1,0,0,0,1,1]; Switch S10 contains itself on the right, and its topological connection right vector TPY 10 =[0,0,0,0,0,0,0,0,0,1].

[0180] (2) Detect the three-phase current I of each switch (distributed intelligent distribution terminal). a I b I c Line voltage U ac U bc Zero-sequence current I0, zero-sequence voltage U0, and the protection status flag bit for each switch.

[0181] A fault has occurred between branch switch S6 and branch switch S7.

[0182] The protection status flag c1 of switch S1 is 1; The protection status flag c2 of switch S2 is 0; The protection status flag c3 of switch S3 is 0; The protection status flag c4 of switch S4 is 0; The protection status flag c5 of switch S5 is 0; The protection status flag c6 of switch S6 is 1; The protection status flag c7 of switch S7 is 0; The protection status flag c8 of switch S8 is 0; The protection status flag c9 of switch S9 is 0; Protection status flag c of switch S10 10 It is 0.

[0183] (3) Each switch (distributed intelligent distribution terminal) sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches (distributed intelligent distribution terminals), and receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag from other terminals in the neighborhood.

[0184] (4) For each switch (distributed intelligent distribution terminal), construct the left vector TPZ and right vector TPY of the topological connection relationship between it and other terminals in its neighborhood, and the protection status flag bit.

[0185] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the protection status flag c has a value of 1; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the protection status flag c has values ​​of 1, 0, and 1, respectively. Therefore, DZZ1=[1,0,0,0,0,0,0,0,0,0], DZY1=[1,0,0,0,0,1,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 0, and 1; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, and 0. Therefore, DZZ2=[1,0,0,0,0,1,0,0,0,0], DZY2=[0,0,0,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0. Therefore, DZZ3=[0,0,0,0,0,0,0,0,0,0], DZY3=[0,0,0,0,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0. Therefore, DZZ4=[0,0,0,0,0,0,0,0,0,0], DZY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of protection status flag c is 0. Therefore, DZZ5=[0,0,0,0,0,0,0,0,0,0], DZY5=[0,0,0,0,0,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 0, and 1; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of protection status flag c is 1 and 0. Therefore, DZZ6=[1,0,0,0,0,1,0,0,0,0], DZY6=[0,0,0,0,0,1,0,0,0,0].

[0186] For switch S7, according to the left vector TPZ of the topological connection, which includes switches S6 and S7, the value of protection status flag c is 1 or 0; according to the right vector TPY of the topological connection, which includes switch S7, the value of protection status flag c is 0. Therefore, DZZ7=[0,0,0,0,0,1,0,0,0,0], DZY7=[0,0,0,0,0,0,0,0,0,0].

[0187] For switch S8, according to the left vector TPZ of the topological connection, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection, which includes switch S8, the value of protection status flag c is 0. Therefore, DZZ8=[0,0,0,0,0,0,0,0,0,0], DZY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of protection status flag c is 0. Therefore, DZZ9=[0,0,0,0,0,0,0,0,0,0], DZY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the protection status flag c has a value of 0, 0, 0, 0; according to the right vector TPY of the topology connection, which includes switch S10, the protection status flag c has a value of 0. Therefore, DZZ 10 =[0,0,0,0,0,0,0,0,0,0],DZY 10 =[0,0,0,0,0,0,0,0,0,0,0].

[0188] (5) For a switch, if the switch action condition right vector DZY And the left vector DZZ of the switch action condition Or the right vector DZY of the switch action condition. And the left vector DZZ of the switch action condition If the condition is not met, the switch will trip, clear the fault, and isolate the fault; if the condition is not met, the switch will remain in its original state.

[0189] For switch S1, the right vector DZY1 of the switch action condition... And the left vector DZZ1 of the switch action condition The tripping conditions are not met.

[0190] For switch S2, the right vector of the switch action condition is DZY2. And the left vector DZZ2 of the switch action condition The tripping conditions are not met.

[0191] For switch S3, the right vector of the switch action condition is DZY3. And the left vector DZZ3 of the switch action condition The tripping conditions are not met.

[0192] For switch S4, the right vector of the switch action condition is DZY4. And the left vector DZZ4 is the condition for the switch action. The tripping conditions are not met.

[0193] For switch S5, the right vector of the switch action condition is DZY5. And the left vector DZZ5 is the switch action condition. The tripping conditions are not met.

[0194] For switch S6, the right vector of the switch action condition is DZY6. And the left vector of the switch action condition, DZZ6 The tripping conditions are not met.

[0195] For switch S7, the right vector of the switch action condition is DZY7. And the left vector of the switch action condition is DZZ7 The tripping conditions are not met.

[0196] For switch S8, the right vector of the switch action condition is DZY8. And the left vector of the switch action condition, DZZ8 The tripping conditions are not met.

[0197] For switch S9, the right vector of the switch action condition is DZY9. And the left vector of the switch action condition DZZ9 The tripping conditions are not met.

[0198] For switch S10, the right vector of the switch action condition is DZY. 10 of And the left vector of the switch action condition is DZZ 10 of The tripping conditions are not met.

[0199] Switches S6 and S7 trip when they meet the operating conditions, while all other switches do not meet the operating conditions and remain in their original state.

[0200] (6) The switches continue to monitor their respective undervoltage flag and power flow direction flag. The power flow direction flag d1 of switch S1 is 1, the undervoltage left flag ez1 is 1, and the undervoltage right flag ey1 is 1.

[0201] The power flow direction flag d2 of switch S2 is 1, the left undervoltage flag ez2 is 1, and the right undervoltage flag ey2 is 1.

[0202] The power flow direction flag d3 of switch S3 is 1, the undervoltage left flag ez3 is 1, and the undervoltage right flag ey3 is 1.

[0203] The power flow direction flag d4 of switch S4 is 1, the left undervoltage flag ez4 is 1, and the right undervoltage flag ey4 is 1.

[0204] The power flow direction flag d5 of switch S5 is 1, the left undervoltage flag ez5 is 0, and the right undervoltage flag ey5 is 1.

[0205] The power flow direction flag d6 of switch S6 is 1, the undervoltage left flag ez6 is 1, and the undervoltage right flag ey6 is 0.

[0206] The power flow direction flag d7 of switch S7 is 1, the left undervoltage flag ez7 is 0, and the right undervoltage flag ey7 is 0.

[0207] The power flow direction flag d8 of switch S8 is 0, the left undervoltage flag ez8 is 1, and the right undervoltage flag ey8 is 1.

[0208] The power flow direction flag d9 of switch S9 is 0, the left undervoltage flag ez9 is 1, and the right undervoltage flag ey9 is 1.

[0209] Power flow direction flag bit d of switch S10 10 The left depressurization flag ez10 is 1, and the right depressurization flag ey10 is 1.

[0210] (7) If the sum of the left vector elements of the topology connection relationship of any switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, then it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection relationship of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a main line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if it does not have the ability to form a network, proceed to step (13). If the sum of the right vector elements of the topology connection of any switch is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, then it is determined to be a branch line fault, the corresponding switch has tripped, and proceed to step (13).

[0211] If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection relationship of switch S5 is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 1, and the sum of the right vector elements of the topology connection relationship of switch S7 is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, it is determined to be a branch line fault. The distributed power supply branch does not have the network construction capability, so proceed to step (13).

[0212] (13) Delay for X3 seconds (generally X3=5s). If the switch meets the following conditions: the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, and step (5) is met, the switch will reclose for the first time. If no fault current is detected, the fault is an instantaneous fault, the protection status flag c is 0, and the switch will close. If the fault current is still detected, the protection status flag c is 1, and the switch will open and be locked.

[0213] The undervoltage left flag ez6 of switch S6 is 1 and the undervoltage right flag ey6 is 0, and step (5) is satisfied, thus satisfying the condition; the reclosing detects the fault current, the protection status flag c is 1, and switch S6 is opened and locked.

[0214] (14) Each switch (distributed intelligent power distribution terminal) sends its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) are set.

[0215] (15) All processes are complete.

[0216] Taking the above typical overhead power distribution line as an example again, such as Figure 8 As shown, if a short circuit occurs at the end of the branch line, and a permanent fault occurs at the end of the branch line switch S7, the fault handling procedure is as follows: (1) Read the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal). Taking the direction from the power source to the load as the positive direction, there are 10 switches in this 10 kV distribution line. Therefore, the left vector TPZ and right vector TPY of the topology relationship of each switch (distributed intelligent distribution terminal) on the distribution line are 10-dimensional row vectors.

[0217] Switch S1 contains itself on the left, and its topological connection left vector TPZ1=[1,0,0,0,0,0,0,0,0,0]; Switch S1 contains itself S1 and S2, S6 on the right, and its topological connection right vector TPY1=[1,1,0,0,0,1,0,0,0,0].

[0218] Switch S2 contains itself S2 and S1, S6 to the left, and its topological connection left vector TPZ2=[1,1,0,0,0,1,0,0,0,0]; switch S2 contains itself S2 and S3, S8 to the right, and its topological connection right vector TPY2=[0,1,1,0,0,0,0,1,0,0].

[0219] Switch S3 contains itself S3 and S2 and S8 to its left, and its topological connection left vector TPZ3=[0,1,1,0,0,0,0,1,0,0]; switch S3 contains itself S3 and S4 to its right, and its topological connection right vector TPY3=[0,0,1,1,0,0,0,0,0,0].

[0220] Switch S4 contains itself S4 and S3 to its left, and its topological connection left vector TPZ4=[0,0,1,1,0,0,0,0,0,0]; switch S4 contains itself S4 and S5, S9, S10 to its right, and its topological connection right vector TPY4=[0,0,0,1,1,0,0,0,1,1].

[0221] The left side of switch S5 contains itself S5 and S4, S9, and S10, and its topological connection left vector TPZ5=[0,0,0,1,1,0,0,0,1,1]; the right side of switch S5 contains itself S5, and its topological connection right vector TPY5=[0,0,0,0,1,0,0,0,0,0].

[0222] Switch S6 contains itself S6 and S1 and S2 to its left, and its topological connection left vector TPZ6=[1,1,0,0,0,1,0,0,0,0]; switch S6 contains itself S6 and S7 to its right, and its topological connection right vector TPY6=[0,0,0,0,0,1,1,0,0,0].

[0223] Switch S7 contains itself S7 and S6 to its left, and its topological connection left vector TPZ7=[0,0,0,0,0,1,1,0,0,0]; switch S7 contains itself S7 to its right, and its topological connection right vector TPY7=[0,0,0,0,0,0,1,0,0,0].

[0224] Switch S8 contains itself S8 and S2 and S3 to its left, and its topological connection left vector TPZ8=[0,1,1,0,0,0,0,1,0,0]; switch S8 contains itself S8 to its right, and its topological connection right vector TPY8=[0,0,0,0,0,0,0,1,0,0].

[0225] Switch S9 contains itself S9 and S4, S5, and S10 to its left, and its topological connection left vector TPZ9=[0,0,0,1,1,0,0,0,1,1]; switch S9 contains itself S9 to its right, and its topological connection right vector TPY9=[0,0,0,0,0,0,0,0,1,0].

[0226] The left side of switch S10 contains itself S10 and S4, S5, and S9, and their topological connection relationship is represented by the left vector TPZ. 10 =[0,0,0,1,1,0,0,0,1,1]; Switch S10 contains itself on the right, and its topological connection right vector TPY 10 =[0,0,0,0,0,0,0,0,0,1].

[0227] (2) Detect the three-phase current I of each switch (distributed intelligent distribution terminal). a I b I c Line voltage U ac U bc Zero-sequence current I0, zero-sequence voltage U0, and the protection status flag bit for each switch.

[0228] A permanent fault has occurred at the end of branch switch S7.

[0229] The protection status flag c1 of switch S1 is 1; The protection status flag c2 of switch S2 is 0; The protection status flag c3 of switch S3 is 0; The protection status flag c4 of switch S4 is 0; The protection status flag c5 of switch S5 is 0; The protection status flag c6 of switch S6 is 1; The protection status flag c7 of switch S7 is 1; The protection status flag c8 of switch S8 is 0; The protection status flag c9 of switch S9 is 0; Protection status flag c of switch S10 10 It is 0.

[0230] (3) Each switch (distributed intelligent distribution terminal) sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches (distributed intelligent distribution terminals), and receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag from other terminals in the neighborhood.

[0231] (4) For each switch (distributed intelligent distribution terminal), construct the left vector TPZ and right vector TPY of the topological connection relationship between it and other terminals in its neighborhood, and the protection status flag bit.

[0232] For switch S1, according to the left vector TPZ of the topology connection, which includes switch S1, the protection status flag c has a value of 1; according to the right vector TPY of the topology connection, which includes switches S1, S2, and S6, the protection status flag c has values ​​of 1, 0, and 1, respectively. Therefore, DZZ1=[1,0,0,0,0,0,0,0,0,0], DZY1=[1,0,0,0,0,1,0,0,0,0]; For switch S2, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 0, and 1; according to the right vector TPY of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, and 0. Therefore, DZZ2=[1,0,0,0,0,1,0,0,0,0], DZY2=[0,0,0,0,0,0,0,0,0,0]; For switch S3, according to the left vector TPZ of the topological connection relationship, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0. Therefore, DZZ3=[0,0,0,0,0,0,0,0,0,0], DZY3=[0,0,0,0,0,0,0,0,0,0]; For switch S4, according to the left vector TPZ of the topological connection relationship, which includes switches S3 and S4, the value of protection status flag c is 0, 0; according to the right vector TPY of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0. Therefore, DZZ4=[0,0,0,0,0,0,0,0,0,0], DZY4=[0,0,0,0,0,0,0,0,0,0]; For switch S5, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S5, the value of protection status flag c is 0. Therefore, DZZ5=[0,0,0,0,0,0,0,0,0,0], DZY5=[0,0,0,0,0,0,0,0,0,0]; For switch S6, according to the left vector TPZ of the topological connection relationship, which includes switches S1, S2, and S6, the value of protection status flag c is 1, 0, and 1; according to the right vector TPY of the topological connection relationship, which includes switches S6 and S7, the value of protection status flag c is 1 and 1. Therefore, DZZ6=[1,0,0,0,0,1,0,0,0,0], DZY6=[0,0,0,0,0,1,1,0,0,0].

[0233] For switch S7, according to the left vector TPZ of the topological connection, which includes switches S6 and S7, the value of protection status flag c is 1, 1; according to the right vector TPY of the topological connection, which includes switch S7, the value of protection status flag c is 1. Therefore, DZZ7=[0,0,0,0,0,1,1,0,0,0], DZY7=[0,0,0,0,0,0,1,0,0,0].

[0234] For switch S8, according to the left vector TPZ of the topological connection, which includes switches S2, S3, and S8, the value of protection status flag c is 0, 0, 0; according to the right vector TPY of the topological connection, which includes switch S8, the value of protection status flag c is 0. Therefore, DZZ8=[0,0,0,0,0,0,0,0,0,0], DZY8=[0,0,0,0,0,0,0,0,0,0]; For switch S9, according to the left vector TPZ of the topological connection relationship, which includes switches S4, S5, S9, and S10, the value of protection status flag c is 0, 0, 0, 0; according to the right vector TPY of the topological connection relationship, which includes switch S9, the value of protection status flag c is 0. Therefore, DZZ9=[0,0,0,0,0,0,0,0,0,0], DZY9=[0,0,0,0,0,0,0,0,0,0]; For switch S10, according to the left vector TPZ of the topology connection, which includes switches S4, S5, S9, and S10, the protection status flag c has a value of 0, 0, 0, 0; according to the right vector TPY of the topology connection, which includes switch S10, the protection status flag c has a value of 0. Therefore, DZZ 10 =[0,0,0,0,0,0,0,0,0,0],DZY 10 =[0,0,0,0,0,0,0,0,0,0,0].

[0235] (5) For a switch, if the switch action condition right vector DZY And the left vector DZZ of the switch action condition Or the right vector DZY of the switch action condition. And the left vector DZZ of the switch action condition If the condition is not met, the switch will trip, clear the fault, and isolate the fault; if the condition is not met, the switch will remain in its original state.

[0236] For switch S1, the right vector DZY1 of the switch action condition... And the left vector DZZ1 of the switch action condition The tripping conditions are not met.

[0237] For switch S2, the right vector of the switch action condition is DZY2. And the left vector DZZ2 of the switch action condition The tripping conditions are not met.

[0238] For switch S3, the right vector of the switch action condition is DZY3. And the left vector DZZ3 of the switch action condition The tripping conditions are not met.

[0239] For switch S4, the right vector of the switch action condition is DZY4. And the left vector DZZ4 is the condition for the switch action. The tripping conditions are not met.

[0240] For switch S5, the right vector of the switch action condition is DZY5. And the left vector DZZ5 is the switch action condition. The tripping conditions are not met.

[0241] For switch S6, the right vector of the switch action condition is DZY6. And the left vector of the switch action condition, DZZ6 The tripping conditions are not met.

[0242] For switch S7, the right vector of the switch action condition is DZY7. And the left vector of the switch action condition is DZZ7 The tripping conditions are met.

[0243] For switch S8, the right vector of the switch action condition is DZY8. And the left vector of the switch action condition, DZZ8 The tripping conditions are not met.

[0244] For switch S9, the right vector of the switch action condition is DZY9. And the left vector of the switch action condition DZZ9 The tripping conditions are not met.

[0245] For switch S10, the right vector of the switch action condition is DZY. 10 of And the left vector of the switch action condition is DZZ 10 of The tripping conditions are not met.

[0246] S7 switch trips if it meets the operating conditions; other switches do not meet the operating conditions and remain in their original state.

[0247] (6) The switches continue to monitor their respective undervoltage flag and power flow direction flag. The power flow direction flag d1 of switch S1 is 1, the undervoltage left flag ez1 is 1, and the undervoltage right flag ey1 is 1.

[0248] The power flow direction flag d2 of switch S2 is 1, the left undervoltage flag ez2 is 1, and the right undervoltage flag ey2 is 1.

[0249] The power flow direction flag d3 of switch S3 is 1, the undervoltage left flag ez3 is 1, and the undervoltage right flag ey3 is 1.

[0250] The power flow direction flag d4 of switch S4 is 1, the left undervoltage flag ez4 is 1, and the right undervoltage flag ey4 is 1.

[0251] The power flow direction flag d5 of switch S5 is 1, the left undervoltage flag ez5 is 0, and the right undervoltage flag ey5 is 1.

[0252] The power flow direction flag d6 of switch S6 is 1, the undervoltage left flag ez6 is 1, and the undervoltage right flag ey6 is 1.

[0253] The power flow direction flag d7 of switch S7 is 1, the undervoltage left flag ez7 is 1, and the undervoltage right flag ey7 is 0.

[0254] The power flow direction flag d8 of switch S8 is 0, the undervoltage left flag ez8 is 0, and the undervoltage right flag ey8 is 0.

[0255] The power flow direction flag d9 of switch S9 is 0, the undervoltage left flag ez9 is 0, and the undervoltage right flag ey9 is 0.

[0256] Power flow direction flag bit d of switch S10 10 The value is 1, the left flag ez10 for the pressure loss is 0, and the right flag ey10 for the pressure loss is 0.

[0257] (7) If the sum of the left vector elements of the topology connection relationship of any switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 0, then it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection relationship of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a main line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to the next step (8); if it does not have the ability to form a network, proceed to step (10). If the conditions of step (5) are met, and the sum of the right vector elements of the topology connection of another switch is equal to 1 and the left undervoltage flag ez is 0 and the right undervoltage flag ey is 1, then it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if it does not have the ability to form a network, proceed to step (13). If the sum of the right vector elements of the topology connection of any switch is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, then it is determined to be a branch line fault, the corresponding switch has tripped, and proceed to step (13).

[0258] If the sum of the right vector elements of the topological connection relationship of switch S7 is equal to 1 and the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, it is determined that the branch line is faulty, that is, the end of S7 is faulty, and proceed to step (13).

[0259] (13) Delay for X3 seconds (generally X3=5s). If the switch meets the following conditions: the left undervoltage flag ez is 1 and the right undervoltage flag ey is 0, and step (5) is met, the switch will reclose for the first time. If no fault current is detected, the fault is an instantaneous fault, the protection status flag c is 0, and the switch will close. If the fault current is still detected, the protection status flag c is 1, and the switch will open and be locked.

[0260] The undervoltage left flag ez7 of switch S7 is 1 and the undervoltage right flag ey7 is 0, and step (5) is satisfied, thus satisfying the condition; the reclosing detects the fault current, the protection status flag c is 1, and switch S7 is opened and locked.

[0261] (14) Each switch (distributed intelligent power distribution terminal) sends its status information to the main station, and the relevant flags of each switch (distributed intelligent power distribution terminal) are set.

[0262] (15) All processes are complete.

[0263] In this embodiment, during each type of fault isolation and power restoration of non-faulty sections, the distributed intelligent power distribution terminal in the primary and secondary integrated circuit breaker complete set of equipment communicates with the power distribution automation system through the first 5G module using a 5G wireless network, thereby transmitting the action process and results of intelligent distributed feeder automation to the power distribution automation system.

[0264] It is easy to see that this invention fully leverages the role of distributed power sources as power sources, enabling distributed power sources to quickly connect to the grid without disconnecting from the grid and operate in a load network. The intelligent distributed feeder automation method first isolates faults, then transfers power to the load, and finally recloses the circuit breaker. This adapts to the changing trends of the current distribution network, improves the reliability level of the distribution network, and helps the high-quality development of distributed power sources.

[0265] Therefore, this invention simultaneously meets the local control requirements of intelligent distributed feeder automation and the monitoring requirements of distribution automation master station, realizing an economical and efficient intelligent distributed feeder terminal design, providing a terminal equipment foundation for the realization of intelligent distributed feeder automation, and will help the application of intelligent distributed feeder automation in power distribution lines containing distributed power sources.

[0266] The fourth embodiment of the present invention relates to an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the intelligent distributed feeder automation method of the third embodiment.

[0267] The fifth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the intelligent distributed feeder automation method of the third embodiment.

[0268] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0269] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0270] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction methods implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0271] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0272] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A distributed intelligent power distribution terminal, characterized in that, The system includes a control unit, a first 5G module, a second 5G module, and a router. The control unit includes a first station control layer network interface, a second station control layer network interface, and a process layer network interface. The first station control layer network interface is connected to the first 5G module, and the first 5G module establishes a communication link with the power distribution automation system. The second station control layer network interface is connected to the second 5G module, the second 5G module is connected to the router, and the router is connected to the process layer network interface. The second 5G module and the router form a 5G wireless private network, which enables communication links with other distributed intelligent power distribution terminals.

2. The distributed intelligent power distribution terminal according to claim 1, characterized in that, The first station control layer network interface and the first 5G module also include a quantum encryption module, which is used to perform quantum encryption on the information reported to the power distribution automation system.

3. A smart distributed feeder automation system for a distribution network incorporating network elements, characterized in that, It includes several distributed intelligent power distribution terminals as described in any one of claims 1-2. Each distributed intelligent power distribution terminal constitutes a complete set of primary and secondary integrated circuit breakers and establishes a communication link with the power distribution automation system through its respective first 5G module to achieve automatic coordinated operation. The distributed intelligent power distribution terminals establish a communication link with each other through the 5G wireless private network. Using peer-to-peer communication technology, the terminals interact with each other to achieve rapid location, isolation, and power restoration of non-faulty areas in the power supply network.

4. The intelligent distributed feeder automation system for distribution networks containing network elements according to claim 3, characterized in that, The integrated primary and secondary circuit breaker assembly includes a circuit breaker and a power supply voltage transformer. The power supply voltage transformer is connected to the distributed intelligent power distribution terminal via a first aviation connector, and the circuit breaker is connected to the distributed intelligent power distribution terminal via a second aviation connector.

5. A method for automating intelligent distributed feeders, characterized in that, The intelligent distributed feeder automation system for distribution networks with network elements as described in any of claims 3-4, wherein the primary and secondary integrated circuit breaker assembly is installed on each switch on the distribution line, specifically includes the following steps: (1) Read the left vector TPZ and right vector TPY of the topology connection relationship for each switch; Among them, for the first A switch, whose topological connection left vector , The definition is as follows: ； For the A switch, whose topological connection right vector , The definition is as follows: ； The number of switches; (2) Detect the three-phase current of each switch. Line voltage Zero-sequence current Zero-sequence voltage And determine the protection status flag bit of each switch; Among them, the The protection status flag bit of each switch The definition is as follows: , This is the fault current setting value; (3) Each switch sends its own topology connection left vector TPZ and topology connection right vector TPY, protection status flag and power flow direction flag to the connected switches, and at the same time receives the topology connection left vector TPZ and topology connection right vector TPY and protection status flag of other switches in the neighborhood. (4) For each switch, based on the left vector TPZ and right vector TPY of the topological connection relationship between it and other switches in its neighborhood, and the protection status flag, construct the left vector DZY and right vector DZY of the switch action condition. Among them, the The left vector of the switch action condition , The definition is as follows: ； Among them, the The right vector of the switch action condition , The definition is as follows: ； (5) For each switch, if the sum of each element in the right vector DZY of the switch action condition is 1 and the sum of each element in the left vector DZZ of the switch action condition is greater than or equal to 1, or the sum of each element in the right vector DZY of the switch action condition is 0 and the sum of each element in the left vector DZZ of the switch action condition is 1, then the responding switch trips, disconnects the fault, and isolates the fault; if the conditions are not met, the switch remains unchanged. (6) Continue to check the undervoltage left flag, undervoltage right flag, and power flow direction flag of each switch; Among them, the Power flow direction flag of each switch The definition is as follows: ； No. The left-side flag of the switch is undervoltage. and the right depressurization flag They are defined as follows: ； ； (7) If the sum of each element in the left vector of the topological connection relationship of any switch is 1 and the undervoltage left flag bit is true. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a substation outgoing line fault, not a line fault, and the corresponding switch trips; if the distributed power supply branch has network construction capability, proceed to step (8); if the distributed power supply branch does not have network construction capability, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is 1 and the undervoltage left flag bit is 0. 0, right flag indicating loss of pressure If the value is 1, it is determined that the main line is faulty and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (10); if the conditions of step (5) are met, where the sum of each element in the right vector of the topological connection relationship of another switch is equal to 1 and the undervoltage left flag bit is set. 0, right flag indicating loss of pressure The sum of each element in the right vector of the topological connection relationship of the switch is 1, and the undervoltage left flag is also 1. 0, right flag indicating loss of pressure If the value is 0, it is determined to be a branch line fault, and the corresponding switch has tripped; if the distributed power supply branch has the ability to form a network, proceed to step (8); if the distributed power supply branch does not have the ability to form a network, proceed to step (13); if the sum of each element in the right vector of the topology connection relationship of any switch is 1 and the undervoltage left flag bit is 0, then the branch line fault is determined to be a branch line fault, and ...

1. Right depressurization flag If the value is 0, it is determined to be a branch line fault, the corresponding switch trips, and proceeds to step (13); (8) For each switch, based on the left vector TPZ and right vector TPY of the topological connection relationship between it and other switches in its neighborhood, the power flow direction flag, the left flag of undervoltage and the right flag of undervoltage, construct the left vector DZDGZ and right vector DZDGY of the operation condition of the distributed power source off-grid operation switch. Among them, the The left vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: ； Among them, the The right vector represents the switching action condition of a distributed power supply operating off-grid. , The definition is as follows: ； (9) For the first For each switch, if the sum of each element in the left vector DZDGZ of the distributed power source off-grid operation switch action condition is greater than or equal to 1, and the sum of each element in the left vector DZDGY of the distributed power source off-grid operation switch action condition is 0, and the switch undervoltage left flag bit... 0, right flag indicating loss of pressure If it is 0, then the first Individual switches trip in response, and regional distributed power sources and loads operate in an off-grid network configuration. (10) The tie switch detects its undervoltage left flag and undervoltage right flag. If the undervoltage left flag is 0, the undervoltage right flag is 1, and the protection status flag of its neighboring area is 0, then the tie switch is closed to restore power supply to the healthy area downstream of the fault section. (11) After a delay of X1 seconds, each switch will send its status information to the main station and set the relevant flags of each switch to their positions. (12) After a delay of 2 seconds, each switch sends its status information to the main station. The main station calculates that if the distributed power supply extension branch is not connected to the fault section, it remotely closes the distributed power supply connection branch switch to transfer the distributed power supply and its load to the main circuit for power supply, thus breaking away from the microgrid mode; if the distributed power supply extension branch is connected to the fault section, the distributed power supply connection branch keeps the switch open. (13) After a delay of 3 seconds, the switch meets the following condition: the left flag of the voltage loss is activated.

1. Right depressurization flag If the value is 0 and the conditions of step (5) are met, the first reclosing will be performed. If no fault current is detected, the fault is an instantaneous fault. The protection status flag will be set to 0 and the switch will be closed. If the fault current is still detected, the protection status flag will be set to 1 and the switch will be opened and locked. (14) Each switch sends its status information to the main station and sets the relevant flags of each switch.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the intelligent distributed feeder automation method as described in claim 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the intelligent distributed feeder automation method as described in claim 5.

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