Distributed rapid fault self-healing method and device for active power distribution network, and medium

Abstract

The invention discloses a distributed rapid fault self-healing method and device for an active power distribution network and a medium. The method comprises the following steps: configuring static network topology information of each intelligent terminal unit in the active power distribution network; when a fault occurs, each intelligent terminal unit asks for fault current data from the adjacent intelligent terminal unit based on static network topology information; the static network topology information of each intelligent terminal unit is updated based on the fault current data, and the dynamic network topology information of each intelligent terminal unit is acquired; determining a fault occurrence section based on the dynamic network topology information of each intelligent terminal unit by using the Frechet distance; and performing fault isolation on the fault occurrence section, and performing reclosing operation on each intelligent terminal unit after the fault is removed to restore power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network fault self-healing, and more specifically, to a distributed rapid fault self-healing method, device and medium for an active distribution network. Background Art

[0002] The basic purpose of distribution network fault self-healing is to locate and isolate the faulty section and restore power supply to the non-faulty section. Traditional distribution networks are generally single-power, radial structures with constant power flow direction, simple protection and reclosing configurations, and easy fault self-healing. When a high-penetration distributed power source is connected to the distribution network, the structure and power flow direction of the distribution network will change, thereby affecting the original protection and reclosing functions, resulting in protection misoperation, refusal to operate, or reclosing failure. In the early days, the penetration rate of new energy was low, and measures were usually taken to remove faults in the active distribution network. However, this measure is not conducive to the safe and stable operation of the distribution network;

[0003] Longitudinal protection, as the most common main protection in the main grid, has been introduced into closed-loop distribution networks at home and abroad in recent years due to its absolute selectivity. With the construction of communication networks between distributed distribution networks and the popularization of 5G communications, a variety of data synchronization technologies suitable for distribution networks have been proposed, and longitudinal differential protection has been gradually introduced into distribution network protection. However, the existing protection principles usually regard new energy as a "negative" load and do not consider the impact of new energy fault ride-through characteristics during the power supply restoration process of the active distribution network. How to coordinate the fault self-healing solution with the control strategy of new energy is still an urgent problem to be solved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method, device and medium for distributed rapid fault self-healing of an active power distribution network.

[0005] According to one aspect of the present invention, there is provided a distributed fast fault self-healing method for an active power distribution network, comprising:

[0006] Configure static network topology information of each intelligent terminal unit in the active distribution network;

[0007] When a fault occurs, each intelligent terminal unit requests fault current data from adjacent intelligent terminal units based on static network topology information;

[0008] Based on the fault current data, the static network topology information of each intelligent terminal unit is updated respectively to obtain the dynamic network topology information of each intelligent terminal unit;

[0009] The Fréchet distance is used to determine the fault occurrence section based on the dynamic network topology information of each intelligent terminal unit;

[0010] The fault section is isolated and after the fault is cleared, each intelligent terminal unit performs a reclosing operation to restore power supply.

[0011] Optionally, when a fault occurs, each intelligent terminal unit requests fault current data from an adjacent intelligent terminal unit based on static network topology information, including:

[0012] The intelligent terminal unit on the power supply side of the system first sends a switch status query instruction to its adjacent intelligent terminal unit. After receiving the instruction, the adjacent intelligent terminal unit marks the intelligent terminal unit that sends the instruction to itself as the upstream intelligent terminal unit, and the other adjacent intelligent terminal units as the downstream intelligent terminal units;

[0013] If all switches controlled by the intelligent terminal unit itself are in a closed state, the switch status query instruction will continue to be forwarded to the downstream intelligent terminal units. If there is an intelligent terminal unit that monitors that its own switch is in a disconnected state or there are no more adjacent intelligent terminal units, the message forwarding will be stopped. After the intelligent terminal unit at the connecting switch confirms its own attributes, it will forward its own communication address to all its adjacent intelligent terminal units. After receiving the communication address of the intelligent terminal unit at the connecting switch, each intelligent terminal unit will relay and forward it until it reaches the intelligent terminal unit on the power supply side.

[0014] Optionally, if a switch controlled by an intelligent terminal unit has an adjacent intelligent terminal unit in the section where the switch is located which is an upstream intelligent terminal unit, then the switch is an upstream switch, and the remaining switches are downstream switches.

[0015] Optionally, the Fréchet distance is used to determine the fault occurrence section based on the dynamic network topology information of each intelligent terminal unit, including:

[0016] Determine the comparison switch of the fault current data sent by the intelligent terminal unit of the sending party according to the serial number of the intelligent terminal unit of the sending party;

[0017] The Fréchet distance is used to compare the switch and fault current, and the fault occurrence section is determined according to the dynamic network topology information and the preset action criteria.

[0018] Optionally, the action criterion is:

[0019]

[0020] In the formula, Represents the current time domain waveform The Fréchet distance, is the current sampling per unit signal, F set is the set value.

[0021] Optionally, the fault section is isolated, including:

[0022] If the fault occurs in the intelligent terminal unit section, the corresponding circuit breaker in the intelligent terminal unit section is controlled to trip;

[0023] If there is an intelligent terminal unit that has not been started, but has received a data request from the upstream STU, and the intelligent terminal unit will send all-zero data to the opposite intelligent terminal unit, then the opposite intelligent terminal unit will send a remote control tripping command to the intelligent terminal unit to isolate the fault after determining that the fault is located in the section within the zone.

[0024] Optionally, after the fault is cleared, each intelligent terminal unit performs a reclosing operation to restore power supply, including:

[0025] After the fault is cleared, the intelligent terminal unit upstream of the fault section performs a voltage-free check. If there is no voltage on the line, a reclosing command is issued;

[0026] If the circuit breaker recloses to a permanent fault after the reclosing command, the upstream intelligent terminal unit detects secondary overcurrent and trips the circuit breaker on this side;

[0027] If it is a transient fault, the upstream intelligent terminal unit sends a message of successful reclosing to the downstream intelligent terminal unit. After receiving the message, the downstream intelligent terminal unit performs a voltage-free check. If the downstream power supply has stopped running, the STU can directly issue a closing command to complete the entire reclosing process.

[0028] If there is still voltage in the downstream feeder, the downstream power supply will perform synchronization check and close the circuit breaker after meeting the grid-connected conditions. After the upstream intelligent terminal unit recloses to a permanent fault, in addition to issuing a trip command, it will also send a closing command to the intelligent terminal unit at the interconnecting switch. The intelligent terminal unit at the interconnecting switch will close the circuit breaker after meeting the closing conditions, thereby restoring power supply to the non-faulty section.

[0029] According to another aspect of the present invention, there is provided an active power distribution network distributed rapid fault self-healing device, comprising:

[0030] A configuration module, used to configure static network topology information of each intelligent terminal unit in the active distribution network;

[0031] A request module, used when a fault occurs, each intelligent terminal unit requests fault current data from an adjacent intelligent terminal unit based on static network topology information;

[0032] An updating module, used to update the static network topology information of each intelligent terminal unit based on the fault current data, and obtain the dynamic network topology information of each intelligent terminal unit;

[0033] A determination module, used to determine the fault occurrence section based on the dynamic network topology information of each intelligent terminal unit using the Fréchet distance;

[0034] The self-healing module is used to isolate the fault section where the fault occurs, and after the fault is removed, each intelligent terminal unit performs a reclosing operation to restore power supply.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present invention.

[0036] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of the above aspects of the present invention.

[0037] Therefore, the present invention can realize distributed fault self-healing of the active distribution network that is not affected by the power supply characteristics, and can quickly and accurately locate and isolate the faulty section of the distribution network and restore power supply to the non-faulty section, greatly improving the power supply reliability of the distribution network and effectively improving the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0039] Figure 1 It is a flow chart of a distributed rapid fault self-healing method for an active power distribution network provided by an exemplary embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of an active power distribution network including STU provided by an exemplary embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of an active distribution network provided by an exemplary embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of an active distribution network with a short circuit fault provided by an exemplary embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of dynamic topology information stored in STU1 provided by an exemplary embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of dynamic topology information stored in STU2 provided by an exemplary embodiment of the present invention;

[0045] Figure 7 is a schematic diagram of sending a closing command provided by an exemplary embodiment of the present invention;

[0046] Figure 8It is a structural schematic diagram of a distributed rapid fault self-healing device for an active power distribution network provided by an exemplary embodiment of the present invention;

[0047] Fig. 9 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0048] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0049] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0050] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0051] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0052] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0053] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0054] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0055] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0056] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0057] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0058] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0059] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0060] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0061] Exemplary Methods

[0062] Figure 1 FIG. 1 is a flow chart of a method for distributed rapid fault self-healing of an active power distribution network provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the active power distribution network distributed rapid fault self-healing method 100 includes the following steps:

[0063] Step 101, configuring static network topology information of each intelligent terminal unit in the active distribution network;

[0064] Step 102, when a fault occurs, each intelligent terminal unit requests fault current data from an adjacent intelligent terminal unit based on static network topology information;

[0065] Step 103, updating the static network topology information of each intelligent terminal unit based on the fault current data, and obtaining the dynamic network topology information of each intelligent terminal unit;

[0066] Step 104, using the Fréchet distance based on the dynamic network topology information of each intelligent terminal unit to determine the fault occurrence section;

[0067] Step 105, isolating the fault section, and after clearing the fault, each intelligent terminal unit performs a reclosing operation to restore power supply.

[0068] Specifically, in order to realize the rapid fault self-healing of active distribution network, meet the long-term development needs of future distribution network, identify the local or global network topology without being affected by power supply characteristics, and change the operation mode and fault self-healing strategy in real time according to different network states, a distributed rapid fault self-healing method for active distribution network is proposed. It includes the following steps:

[0069] S1: Configure the static network topology information of the smart terminal unit (STU);

[0070] S2: When a fault occurs, the STU requests fault current data and obtains dynamic network topology information;

[0071] S3: STU compares the current data and uses the Fréchet distance to determine whether the fault occurs within the section;

[0072] S4: STU issues a trip command to isolate the fault;

[0073] S5: STU issues a command to operate the reclosing switch to restore power supply to the non-fault section.

[0074] Specifically, step S1 is as follows:

[0075] STU is a protection unit with independent data processing capabilities and the ability to autonomously control switch actions. It can communicate with each other peer-to-peer based on a variety of communication networks.

[0076] like Figure 2 As shown, STU is installed in each ring main unit of the distribution network and can control the opening and closing of local switches. All switches in the figure are circuit breakers, and the color of the circuit breaker represents its opening and closing state, black represents closed, and white represents open.

[0077] Mastering complete topology information is the basis for STU to realize self-healing function. Different operation modes of distribution network also correspond to different network topology structures. Therefore, STU needs to have the ability to obtain network topology information. Static network topology information includes relevant information of this STU and adjacent STUs. During the initial configuration, the static network topology information stored in each STU is set as shown in Table 1.

[0078] Table 1 Static network topology information table of STU

[0079]

[0080]

[0081] Specifically, step S2 is as follows:

[0082] After a certain STU detects a sudden change in current and starts, it requests fault current data from all adjacent STUs. The STU that receives the fault current data request command sends the fault current data of the corresponding switch in Table 1 according to the requesting STU number.

[0083] When the grid structure is fixed, different network operation modes also correspond to different topological structures, and the corresponding topological information should be updated as the topological structure changes. This information can be obtained when the STU runs for the first time. In subsequent operations, it should be updated regularly or after a switch changes position to automatically adapt to changes in network operation status. Different types of dynamic network topological information should be stored in STUs of different natures.

[0084] Table 2 Upstream and downstream relationship information of STU

[0085]

[0086] The dynamic network topology information identification and storage scheme is as follows: the STU on the power supply side of the system first sends a switch status query instruction to its adjacent STU. After receiving the instruction, the adjacent STU marks the STU that sends the instruction to itself as the upstream STU, and the other adjacent STUs as the downstream STUs; accordingly, for the switches controlled by the STU, if the adjacent STU in the section where a switch is located is the upstream STU, then the switch is the upstream switch, and the other switches are downstream switches. If all the switches controlled by the STU itself are in the closed state, the switch status query instruction will continue to be forwarded to the downstream STU. During the forwarding process, if a STU monitors that it has a switch in the disconnected state or no longer has an adjacent STU, it will stop forwarding the message. If the STU receives query instructions from different adjacent STUs or is itself a power supply STU with a disconnected switch, it confirms that it is a contact switch STU. After the contact switch STU confirms its own attributes, it forwards its own communication address to all its adjacent STUs. After receiving the communication address of the contact switch STU, each STU relays the message until the power supply side STU.

[0087] Specifically, step S3 is as follows:

[0088] After receiving the fault current data sent by the adjacent STU, the receiving STU determines which switch's current data to compare with according to the data sender's STU number. In order to cope with the bidirectional flow of fault current in the active distribution network, the waveform similarity principle is used to locate the fault section with Fréchet distance as the quantitative index to determine whether the fault occurs in the section.

[0089] The following is the algorithm principle:

[0090] Assume that points v and m start along their respective trajectories V and M at speeds α(t) and β(t) respectively, and the infimum of the maximum distance between them is the Fréchet distance, t∈[0,1]. Its mathematical definition is as follows:

[0091]

[0092] Where: V is the trajectory of point v; M is the trajectory of point m; V(α(t)) represents the position of point v at time t; M(β(t)) represents the position of point m at time t; d represents the distance between two points under a certain measurement method; inf is the infimum.

[0093] The central idea of ​​Fréchet is that for two trajectories of arbitrary shapes in space, an optimal distance value can be obtained by a certain measurement method, which characterizes the degree of morphological difference between the two trajectories.

[0094] This paper uses it to measure the waveform difference of time domain signals. Taking a starting time t0 as an example, two groups of steady-state sinusoidal AC signals with different amplitudes and phase angles, assuming that the time window length is T w , the waveform trajectories A and B observed in the time window satisfy the following expressions:

[0095]

[0096] Where: M represents the amplitude; w is the signal frequency; is the initial phase angle.

[0097] Consider A and B as two trajectories in the time window. If the sampling is synchronous and the signal is continuous, it can be regarded as two points on the trajectory moving from the initial position at the same speed w along their respective trajectories for a time window length. Combining equations (1) and (2), the Fréchet distance between A and B is as follows:

[0098]

[0099] In the formula: α(τ)=β(τ)=wτ.

[0100] If the metric d is taken as Euclidean distance, then:

[0101]

[0102] Combining equations (1), (2), and (3), we can deduce:

[0103]

[0104] In the formula, Difference ΔM from waveform amplitude 12 , phase angle difference It is related to the amplitude and phase difference characteristics of the waveform.

[0105] Considering the selection of the time window, the following final expression can be obtained:

[0106]

[0107] From formula (6), we know that when T w When it is greater than or equal to half a cycle, This means that when the time window is greater than or equal to half a cycle of the observed waveform, the Fréchet distance is only related to the amplitude and phase difference characteristics between the waveforms. When the time window is less than half a cycle of the observed signal waveform, the Fréchet distance will have inherent fluctuations. Since the fault current waveform will eventually converge stably near the power frequency, the Fréchet distance is used to measure the morphological differences of the power frequency signal. In theory, only a 10ms time window is required to ensure the absolute convergence of the algorithm.

[0108] When the waveforms A and B are exactly the same, ΔM 12 =0, The Fréchet distance is 0. When the amplitude difference between A and B is fixed, for example, ΔM 12 = 0, the Fréchet distance is Similarly, when the phase angle difference between A and B is fixed, for example The Fréchet distance is positively correlated with the amplitude difference. When the amplitude difference and phase angle difference of the A and B waveforms increase, ΔM 12 and Will increase simultaneously As it increases, the Fréchet distance increases.

[0109] by Figure 3 Taking the active distribution network schematic diagram in as an example, its action criterion is:

[0110]

[0111] In the formula, Represents the current time domain waveform The Fréchet distance, F set is the set value.

[0112] Specifically, step S4 is as follows:

[0113] After judgment, if the fault occurs in the section, the corresponding circuit breaker will be controlled to trip. If there is a weak feed, a STU is not started, but receives a data request from the upstream STU, then the STU will send all zero data to the opposite end. After the opposite end STU determines that the fault is located in the zone, it will send a remote control trip command to the STU to isolate the fault.

[0114] Specifically, step S5 is as follows:

[0115] After the fault section is removed, the upstream STU of the section starts the reclosing operation after a delay. First, it checks for no voltage to ensure that the downstream circuit breaker is open. If there is no voltage on the line, it issues a reclosing command. If the reclosing reaches a permanent fault, the upstream STU detects secondary overcurrent and trips the circuit breaker on this side; if it is a transient fault, the upstream STU sends a message of successful reclosing to the downstream STU. After receiving the message, the downstream STU first checks for no voltage. If the downstream DG has exited operation, the STU can directly issue a closing command to complete the entire reclosing process; if there is still voltage in the downstream feeder, it means that the downstream DG is in a networked state. In order to prevent a large impact current from being generated when connected to the grid, the downstream STU must also perform a synchronization check operation and close the circuit after meeting the grid connection conditions. After the upstream STU recloses to a permanent fault, in addition to issuing a tripping command, it will also send a closing command to the STU at the interconnection switch. The STU at the interconnection switch will close the circuit after meeting the closing conditions to restore power supply to the non-faulty section.

[0116] by Figure 4 The above process is explained by taking a fault at f1 in the active distribution network as an example.

[0117] S1: Configure STU static network topology information;

[0118] Furthermore, before the failure occurs, according to the contents of Table 1, Figure 4 The STU static network topology information in the active distribution network is configured.

[0119] S2: When a fault occurs, the STU requests fault current data and obtains dynamic network topology information;

[0120] Furthermore, a fault occurs at f1. Since there are power sources both upstream and downstream of the fault point, STU1 and STU2 start up and request fault current data from the adjacent STUs, that is, STU1 requests fault current data from STU2 and STU4, and STU2 requests fault current data from STU1. After receiving the current request command, STU1, STU2, and STU4 send fault current data to the requesting party respectively. The fault current data flowing through switch K13 is sent to STU2; the fault current data flowing through switches K21 and K41 are sent to STU1. The dynamic topology information obtained by STU1 and STU2 is as follows: Figure 5 , Figure 6 shown. Figure 5 Dynamic topology information stored for STU1; Figure 6 Dynamic topology information stored for STU2.

[0121] S3: STU compares the current data and uses the Fréchet distance to determine whether the fault occurs within the section;

[0122] After STU1 and STU2 receive the corresponding circuit breaker fault current information sent by the adjacent STU, they respectively perform section positioning according to the dynamic network topology stored in themselves. The section positioning technology can adopt the idea of ​​differential protection, that is, STU1 and STU2, STU4, STU2 and STU1 respectively perform internal and external fault positioning according to the aforementioned waveform comparison algorithm based on Fréchet distance, and select the fault section STU1-STU2.

[0123] S4: STU issues a trip command to isolate the fault;

[0124] Trip circuit breakers K13 and K21 to isolate the fault (reclose for permanent short circuit fault).

[0125] S5: STU issues a command to operate the reclosing switch to restore power supply to the non-fault section.

[0126] After the fault is isolated, the downstream STU of the isolated section sends a pre-closing command to all the tie switches. For example, if the upstream power supply of STU2 cannot supply power to it, STU2 sends a closing command to STU3 at the tie switch. Figure 7 shown.

[0127] Therefore, the present invention can realize distributed fault self-healing of the active distribution network that is not affected by the power supply characteristics, and can quickly and accurately locate and isolate the faulty section of the distribution network and restore power supply to the non-faulty section, greatly improving the power supply reliability of the distribution network and effectively improving the stability of the power system.

[0128] Exemplary Devices

[0129] Figure 8 FIG. 1 is a schematic diagram of the structure of a distributed rapid fault self-healing device for an active power distribution network provided by an exemplary embodiment of the present invention. Figure 8 As shown, the device 800 includes:

[0130] Configuration module 810, used to configure static network topology information of each intelligent terminal unit in the active distribution network;

[0131] The request module 820 is used for each intelligent terminal unit to request fault current data from an adjacent intelligent terminal unit based on static network topology information when a fault occurs;

[0132] An updating module 830 is used to update the static network topology information of each intelligent terminal unit based on the fault current data, and obtain the dynamic network topology information of each intelligent terminal unit;

[0133] A determination module 840, for determining a fault occurrence section based on dynamic network topology information of each intelligent terminal unit using Fréchet distance;

[0134] The self-healing module 850 is used to isolate the fault section where the fault occurs, and after the fault is removed, each intelligent terminal unit performs a reclosing operation to restore power supply.

[0135] Optionally, the request module 820 includes:

[0136] The intelligent terminal unit on the power supply side of the system first sends a switch status query instruction to its adjacent intelligent terminal unit. After receiving the instruction, the adjacent intelligent terminal unit marks the intelligent terminal unit that sends the instruction to itself as the upstream intelligent terminal unit, and the other adjacent intelligent terminal units as the downstream intelligent terminal units;

[0137] If all switches controlled by the intelligent terminal unit itself are in a closed state, the switch status query instruction will continue to be forwarded to the downstream intelligent terminal units. If there is an intelligent terminal unit that monitors that its own switch is in a disconnected state or there are no more adjacent intelligent terminal units, the message forwarding will be stopped. After the intelligent terminal unit at the connecting switch confirms its own attributes, it will forward its own communication address to all its adjacent intelligent terminal units. After receiving the communication address of the intelligent terminal unit at the connecting switch, each intelligent terminal unit will relay and forward it until it reaches the intelligent terminal unit on the power supply side.

[0138] Optionally, if a switch controlled by an intelligent terminal unit has an adjacent intelligent terminal unit in the section where the switch is located which is an upstream intelligent terminal unit, then the switch is an upstream switch, and the remaining switches are downstream switches.

[0139] Optionally, the determination module 840 includes:

[0140] Determine the comparison switch of the fault current data sent by the intelligent terminal unit of the sending party according to the serial number of the intelligent terminal unit of the sending party;

[0141] The Fréchet distance is used to compare the switch and fault current, and the fault occurrence section is determined according to the dynamic network topology information and the preset action criteria.

[0142] Optionally, the action criterion is:

[0143]

[0144] In the formula, Represents the current time domain waveform The Fréchet distance, is the current sampling per unit signal, F set is the set value.

[0145] Optionally, the self-healing module 850 performs fault isolation on the fault-occurring section, including:

[0146] If the fault occurs in the intelligent terminal unit section, the corresponding circuit breaker in the intelligent terminal unit section is controlled to trip;

[0147] If there is an intelligent terminal unit that has not been started, but has received a data request from the upstream STU, and the intelligent terminal unit will send all-zero data to the opposite intelligent terminal unit, then the opposite intelligent terminal unit will send a remote control tripping command to the intelligent terminal unit to isolate the fault after determining that the fault is located in the section within the zone.

[0148] Optionally, in the self-healing module 850, after the fault is cleared, each intelligent terminal unit performs a reclosing operation to restore power supply, including:

[0149] After the fault is cleared, the intelligent terminal unit upstream of the fault section performs a voltage-free check. If there is no voltage on the line, a reclosing command is issued;

[0150] If the circuit breaker recloses to a permanent fault after the reclosing command, the upstream intelligent terminal unit detects secondary overcurrent and trips the circuit breaker on this side;

[0151] If it is a transient fault, the upstream intelligent terminal unit sends a message of successful reclosing to the downstream intelligent terminal unit. After receiving the message, the downstream intelligent terminal unit performs a voltage-free check. If the downstream power supply has stopped running, the STU can directly issue a closing command to complete the entire reclosing process.

[0152] If there is still voltage in the downstream feeder, the downstream power supply will perform synchronization check and close the circuit breaker after meeting the grid-connected conditions. After the upstream intelligent terminal unit recloses to a permanent fault, in addition to issuing a trip command, it will also send a closing command to the intelligent terminal unit at the interconnecting switch. The intelligent terminal unit at the interconnecting switch will close the circuit breaker after meeting the closing conditions, thereby restoring power supply to the non-faulty section.

[0153] Exemplary Electronic Devices

[0154] Fig. 9 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. Fig. 9 As shown, the electronic device 90 includes one or more processors 91 and a memory 92 .

[0155] The processor 91 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0156] The memory 92 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 91 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may also include: an input device 93 and an output device 94, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0157] In addition, the input device 93 may also include, for example, a keyboard, a mouse, and the like.

[0158] The output device 94 can output various information to the outside. The output device 94 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0159] Of course, to simplify, Fig. 9 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0160] Exemplary computer program products and computer-readable storage media

[0161] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above-mentioned "Exemplary Method" section of this specification.

[0162] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0163] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0164] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0165] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0166] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0167] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0168] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware or any combination of software, hardware, firmware. The above order of steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

[0169] It should also be noted that in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but in accordance with the widest range consistent with the principles and novel features disclosed here.

[0170] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A distributed rapid fault self-healing method for an active distribution network, characterized in that: include: Configure static network topology information of each intelligent terminal unit in the active distribution network; When a fault occurs, each intelligent terminal unit requests fault current data from an adjacent intelligent terminal unit based on the static network topology information; Based on the fault current data, the static network topology information of each intelligent terminal unit is updated respectively to obtain the dynamic network topology information of each intelligent terminal unit; Determine the fault occurrence section based on the dynamic network topology information of each intelligent terminal unit using the Fréchet distance; The fault section is isolated, and after the fault is cleared, each intelligent terminal unit performs a reclosing operation to restore power supply.

2. The method according to claim 1, characterized in that When a fault occurs, each intelligent terminal unit requests fault current data from an adjacent intelligent terminal unit based on the static network topology information, including: The intelligent terminal unit on the power supply side of the system first sends a switch status query instruction to its adjacent intelligent terminal unit. After receiving the instruction, the adjacent intelligent terminal unit marks the intelligent terminal unit that sends the instruction to itself as the upstream intelligent terminal unit, and the other adjacent intelligent terminal units as the downstream intelligent terminal units; If all switches controlled by the intelligent terminal unit itself are in a closed state, the switch status query instruction will continue to be forwarded to the downstream intelligent terminal units. If there is an intelligent terminal unit that monitors that its own switch is in a disconnected state or there are no more adjacent intelligent terminal units, the message forwarding will be stopped. After the intelligent terminal unit at the connecting switch confirms its own attributes, it will forward its own communication address to all its adjacent intelligent terminal units. After receiving the communication address of the intelligent terminal unit at the connecting switch, each intelligent terminal unit will relay and forward it until it reaches the intelligent terminal unit on the power supply side.

3. The method according to claim 2, characterized in that If the switch controlled by the intelligent terminal unit has an adjacent intelligent terminal unit in the section where the switch is located, which is an upstream intelligent terminal unit, then the switch is the upstream switch, and the remaining switches are downstream switches.

4. The method according to claim 1, characterized in that Determining the fault occurrence section based on the dynamic network topology information of each intelligent terminal unit by using the Fréchet distance includes: Determine the comparison switch of the fault current data sent by the intelligent terminal unit of the sending party according to the serial number of the intelligent terminal unit of the sending party; The fault occurrence section is determined by utilizing the Fréchet distance based on the comparison switch and the fault current, according to the dynamic network topology information and a preset action criterion.

5. The method according to claim 4, characterized in that The action criteria are: In the formula, Represents the current time domain waveform The Fréchet distance, is the current sampling per unit signal, F set is the set value.

6. The method according to claim 1, characterized in that Performing fault isolation on the fault-occurring section includes: If the fault occurs in the intelligent terminal unit section, the corresponding circuit breaker in the intelligent terminal unit section is controlled to trip; If there is an intelligent terminal unit that has not been started, but has received a data request from the upstream STU, and the intelligent terminal unit will send all-zero data to the opposite intelligent terminal unit, then the opposite intelligent terminal unit will send a remote control tripping command to the intelligent terminal unit to isolate the fault after determining that the fault is located in the zone.

7. The method according to claim 1, characterized in that After the fault is cleared, each intelligent terminal unit performs a reclosing operation to restore power supply, including: After the fault is cleared, the intelligent terminal unit upstream of the fault section performs a voltage-free check, and if there is no voltage on the line, a reclosing command is issued; If the circuit breaker recloses to a permanent fault after the reclosing command, the upstream intelligent terminal unit detects secondary overcurrent and trips the circuit breaker on this side; If it is a transient fault, the upstream intelligent terminal unit sends a message of successful reclosing to the downstream intelligent terminal unit. After receiving the message, the downstream intelligent terminal unit performs a voltage-free check. If the downstream power supply has stopped running, the STU can directly issue a closing command to complete the entire reclosing process. If there is still voltage in the downstream feeder, the downstream power supply will perform synchronization check and close the circuit breaker after meeting the grid-connected conditions. After the upstream intelligent terminal unit recloses to a permanent fault, in addition to issuing a trip command, it will also send a closing command to the intelligent terminal unit at the interconnecting switch. The intelligent terminal unit at the interconnecting switch will close the circuit breaker after meeting the closing conditions, thereby restoring power supply to the non-faulty section.

8. A distributed rapid fault self-healing device for an active power distribution network, characterized in that: include: A configuration module, used to configure static network topology information of each intelligent terminal unit in the active distribution network; A request module, used for each intelligent terminal unit to request fault current data from an adjacent intelligent terminal unit based on the static network topology information when a fault occurs; An updating module, configured to update the static network topology information of each intelligent terminal unit based on the fault current data, and obtain dynamic network topology information of each intelligent terminal unit; A determination module, used to determine a fault occurrence section based on the dynamic network topology information of each intelligent terminal unit using the Fréchet distance; The self-healing module is used to isolate the fault section where the fault occurs, and after the fault is removed, each intelligent terminal unit performs a reclosing operation to restore power supply.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 7.

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