Current constant setting method and device and electronic equipment

Abstract

The application discloses a current fixed value setting method and device and electronic equipment. The method comprises the following steps: determining a set of operation scenarios of a power distribution network, and determining a set of system gears of a flexible interconnected device in the power distribution network; determining the fault current amplitude of a directional overcurrent protection device in the power distribution network under different fault categories according to the set of operation scenarios and the set of system gears; determining the fault current boundary of the directional overcurrent protection device under different fault categories according to the fault current amplitude; and determining the current fixed value corresponding to the directional overcurrent protection device according to the fault current boundary and a preset safety factor. The application solves the technical problem of low reliability of current fixed value setting due to the fact that the directional overcurrent protection setting method in the related art usually determines the fault current boundary based on a single working condition or an experience margin, and does not consider the operation uncertainty of the power distribution network and the flexible interconnected regulation capacity.

Description

Technical Field

[0001] This application relates to the field of power system relay protection technology, and more specifically, to a current setting method, device, and electronic equipment. Background Technology

[0002] Distribution networks are evolving from traditional single-source radial structures to active distribution networks with multiple source connections, ring networks, or mesh operations. The widespread application of distributed generation grid connection, loop-connected operation of tie switches, and flexible interconnection devices (such as phase-shifting transformers) has resulted in bidirectional or even multidirectional power flow on lines, with the amplitude and direction of fault currents dynamically changing with the operating mode. To address this change, engineering practices commonly equip feeders or lines with two-stage directional overcurrent protection with directional elements at both ends: the first stage is a directional instantaneous overcurrent element used to quickly clear faults in the vicinity of the line; the second stage is a directional overcurrent element, which, in conjunction with a fixed time delay, provides full-line protection and backup functions.

[0003] In flexible interconnected distribution networks, the setting methods in related technologies generally suffer from the following shortcomings: First, the setting stage often assumes a fixed power flow direction or uses only a few typical methods for setting, failing to incorporate the explicit impact of phase shift adjustment of flexible interconnected devices on power flow redistribution into the calculation boundary, leading to maloperation or failure to operate when the actual operating mode changes; Second, the output of loads and distributed power sources is uncertain. If the maximum operating current and minimum fault current boundaries are determined based on a single operating condition or experience margin, it is difficult to guarantee that both maloperation and failure to operate are met simultaneously across the entire scenario; Third, in ring or mesh structures, faults on adjacent lines may generate large through currents on the same line. If the instantaneous trip current setting lacks current constraints, instantaneous tripping may occur, causing unnecessary expansion of the fault clearing range and the risk of continuous multi-stage disconnection; Fourth, some adaptive protection methods rely on online or remote setting modification, but remote setting conditions are often not available under field safety strategies. Therefore, an offline, reproducible, and auditable setting method is needed.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a current setting method, apparatus, and electronic device to at least solve the technical problem that the reliability of current setting is low because the directional overcurrent protection setting method in the related art is often based on a single operating condition or empirical margin to determine the fault current boundary, without considering the uncertainty of distribution network operation and the flexible interconnection regulation capability.

[0006] According to one aspect of the embodiments of this application, a current setting method is provided, comprising: determining a set of operating scenarios for a distribution network, and determining a set of system taps for flexible interconnection devices in the distribution network, wherein the set of operating scenarios represents the distribution of loads and distributed power outputs at each node in the distribution network, and the set of system taps represents the settable phase shift tap combinations for the flexible interconnection devices; determining the fault current amplitude of a directional overcurrent protection device in the distribution network under different fault categories based on the set of operating scenarios and the set of system taps; determining the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude; and determining the current setting corresponding to the directional overcurrent protection device based on the fault current boundary and a preset safety factor.

[0007] Optionally, determining the set of operating scenarios for the distribution network includes: acquiring node load data and distributed generation output data of the distribution network; determining the active power injection and reactive power injection of the distribution network nodes based on the node load data and distributed generation output data; determining the probability distribution model corresponding to the active power injection and reactive power injection; and obtaining operating scenario samples from the probability distribution model for cluster analysis to obtain the set of operating scenarios for the distribution network.

[0008] Optionally, determining the system tap set of flexible interconnection devices in the distribution network includes: determining the set of flexible interconnection devices in the distribution network; determining the discrete tap set corresponding to the set of flexible interconnection devices based on the phase shift angle of each flexible interconnection device; and determining the system tap set based on the discrete tap set.

[0009] Optionally, the fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories is determined based on the set of operating scenarios and the set of system taps, including: determining the normal current amplitude of the directional overcurrent protection device under the target operating scenario and the target system tap, wherein the target operating scenario is any scenario in the set of operating scenarios and the target system tap is any tap in the set of system taps; determining the fault current amplitude of the directional overcurrent protection device under different fault categories based on the normal current amplitude, wherein the fault categories include at least: intra-zone fault, near-zone fault and target extra-zone fault, wherein the target extra-zone fault is used to represent a short-circuit fault located in a non-local section coupled to an adjacent feeder, busbar or flexible interconnection device, but capable of generating the maximum through current at the directional overcurrent protection device.

[0010] Optionally, the fault current boundary of the directional overcurrent protection device under different fault categories is determined based on the fault current amplitude, including: determining the minimum fault current of the directional overcurrent protection device under in-zone faults based on the fault current amplitude, based on the target operating scenario and target system speed; determining the minimum fault current of the directional overcurrent protection device under near-zone faults based on the fault current amplitude; and determining the maximum fault through-current of the directional overcurrent protection device under faults outside the target zone based on the fault current amplitude, wherein the maximum fault through-current is used to constrain the over-level operation of the directional overcurrent protection device under faults outside the target zone.

[0011] Optionally, the method further includes: determining binary variables corresponding to the target operating scenario and the target system gear; and determining target constraints based on the binary variables, wherein the target constraints are used to maximize the robustness margin of the current setpoint.

[0012] Optionally, determining the current setting value corresponding to the directional overcurrent protection device based on the fault current boundary and a preset safety factor includes: obtaining a preset margin variable, wherein the preset margin variable is used to improve the robustness margin of the current setting value; determining the setting value boundary corresponding to the current setting value, wherein the setting value boundary includes a first setting value boundary corresponding to the current setting value during the delay period and a second setting value boundary corresponding to the current setting value during the instantaneous trip; and determining the current setting value during the delay period and the current setting value during the instantaneous trip corresponding to the directional overcurrent protection device based on the target constraint conditions, the preset margin variable, the preset safety factor, and the setting value boundary.

[0013] Optionally, the method further includes: verifying the current setting value of the delay period and the current setting value of the instantaneous trip section to obtain a first verification result; if the first verification result indicates that the current setting value of the delay period and the current setting value of the instantaneous trip section have passed the verification, determining the current setting value of the delay period and the current setting value of the instantaneous trip section as the current setting value corresponding to the directional overcurrent protection device; if the first verification result indicates that the current setting value of the delay period or the current setting value of the instantaneous trip section has failed the verification, optimizing the current setting value of the delay period or the current setting value of the instantaneous trip section.

[0014] Optionally, the method further includes: verifying the preset margin variable to obtain a second verification result; when the second verification result indicates that the preset margin variable is greater than 0, determining the current setting value of the delay period and the current setting value of the instantaneous trip section as the current setting value corresponding to the directional overcurrent protection device; when the second verification result indicates that the preset margin variable is equal to 0, optimizing the current setting value of the delay period and the current setting value of the instantaneous trip section according to the preset conflict rules.

[0015] According to another aspect of the embodiments of this application, a current setting device is also provided, comprising: a first determining module, configured to determine a set of operating scenarios of a distribution network and a set of system taps for flexible interconnection devices in the distribution network, wherein the set of operating scenarios represents the distribution of loads and distributed power outputs at each node in the distribution network, and the set of system taps represents the settable phase shift tap combinations for the flexible interconnection devices; a second determining module, configured to determine the fault current amplitude of a directional overcurrent protection device in the distribution network under different fault categories based on the set of operating scenarios and the set of system taps; a third determining module, configured to determine the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude; and a fourth determining module, configured to determine the current setting corresponding to the directional overcurrent protection device based on the fault current boundary and a preset safety factor.

[0016] According to another aspect of the embodiments of this application, an electronic device is also provided, including: a memory and a processor, wherein the memory is used to store program instructions; and the processor is connected to the memory and used to execute the above-described current setting method.

[0017] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored computer program, wherein the device where the non-volatile storage medium is located executes the above-described current setting method by running the computer program.

[0018] According to another aspect of the embodiments of this application, a computer program product is also provided, including computer instructions, which, when executed by a processor, implement the above-described current setting method.

[0019] In this embodiment, by determining the set of operating scenarios for the distribution network and the set of system taps for the flexible interconnection devices in the distribution network, where the set of operating scenarios represents the distribution of loads and distributed power outputs at each node in the distribution network, and the set of system taps represents the settable phase shift tap combinations for the flexible interconnection devices; the fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories is determined based on the set of operating scenarios and the set of system taps; the fault current boundary of the directional overcurrent protection device under different fault categories is determined based on the fault current amplitude; and the current setting corresponding to the directional overcurrent protection device is determined based on the fault current boundary and a preset safety factor. This achieves the goal of coordinating operational uncertainties and the adjustment capabilities of the flexible interconnection devices under offline conditions, thereby realizing the technical effect of safe and reliable directional overcurrent protection setting under all scenarios, without false tripping, failure to trip, or exceeding the limit. This solves the technical problem that the directional overcurrent protection setting method in related technologies often determines the fault current boundary based on a single operating condition or experience margin, without considering the operational uncertainties of the distribution network and the adjustment capabilities of the flexible interconnection, resulting in low reliability of the current setting. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a hardware structure diagram of a computer terminal for implementing a current setting method according to an embodiment of this application;

[0022] Figure 2 This is a flowchart of a current setting method according to an embodiment of this application;

[0023] Figure 3 This is a flowchart of another current setting method according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of a current setpoint calculation process according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of a composite verification process according to an embodiment of this application;

[0026] Figure 6 This is a structural diagram of a current setting device according to an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] First, some nouns or terms that appear in the explanation of the embodiments of this application shall be interpreted as follows:

[0030] Flexible interconnection: refers to the technology of achieving flexible power exchange and voltage phase adjustment between different feeders or areas in the distribution network through power electronic devices, which can enhance the flexibility and reliability of system operation. Its core device is usually a power electronic transformer or a phase-shifting transformer.

[0031] PST (Phase Shifting Transformer): A power electronic device that can control power flow distribution by adjusting the phase of the output voltage. In flexible interconnected distribution networks, it is used to actively regulate the direction and magnitude of power flow between lines.

[0032] Directional overcurrent protection: a protection method that determines whether to operate based on the direction of the fault current. It is often used in multi-power supply or ring network systems to avoid false tripping during reverse faults.

[0033] Monte Carlo sampling: a numerical method based on random sampling and statistical simulation, used to evaluate the response distribution of a system under various uncertain inputs, and often used for stochastic modeling of load and distributed power output.

[0034] Quantile discretization refers to dividing a continuous probability distribution into a finite number of discrete scenarios based on specific quantiles (such as 5%, 25%, 50%, 75%, 95%) to simplify calculations and retain the main operational characteristics.

[0035] In-zone faults: These refer to faults that occur within the protected line itself and are the primary targets of overcurrent protection.

[0036] Near-zone faults: These refer to faults located in a region (such as the first 10% to 20% of the line length) near the protection installation point at the front end of the protected line. They are critical areas that need to be quickly disconnected by the quick-break section.

[0037] Maximum out-of-zone current: refers to the maximum fault current flowing at the protection measurement point of this line due to power flow redistribution when a fault occurs on an adjacent line or bus. It is an important constraint to prevent instantaneous overcurrent protection from tripping out of its proper range.

[0038] Binary variables: Integer variables with values ​​of 0 or 1, used to represent logical selections. In this application, they represent whether a certain flexible interconnect device level is selected in a certain operating scenario.

[0039] Robust margin: refers to the minimum safety margin between the protection setting and the boundary current under the most unfavorable operating scenario. In this application, the goal is to maximize the robust margin to ensure the reliability and safety of protection actions across all scenarios.

[0040] This application provides a current setting method, which can be operated in... Figure 1 The computer terminal shown is described below.

[0041] The current setting method provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal for implementing a current setting method is shown. Figure 1 As shown, the computer terminal 10 may include one or more processors (shown as 102a, 102b, ..., 102n in the figure) (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 104 for storing data, and a transmission module 106 for communication functions connected via wired and / or wireless networks. In addition, it may also include: a display, a keyboard, a cursor control device, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the I / O interface), a network interface, and a BUS bus. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0042] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10. As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0043] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the current setting method in the embodiments of this application. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the aforementioned current setting method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0044] The transmission module 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer terminal 10. In one example, the transmission module 106 includes a network interface controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission module 106 may be a radio frequency (RF) module, used for wireless communication with the Internet.

[0045] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10.

[0046] It should be noted here that, in some optional embodiments, the above... Figure 1 The computer terminal shown may include hardware elements (including circuitry), software elements (including computer code stored on a computer-readable medium), or a combination of both hardware and software elements. It should be noted that... Figure 1 This is only one instance of a specific particular instance, and is intended to illustrate the types of components that may exist in the aforementioned computer terminal.

[0047] In the above operating environment, this application provides an embodiment of a current setting method. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0048] Figure 2 This is a flowchart of a current setting method according to an embodiment of this application, such as... Figure 2As shown, the method includes the following steps:

[0049] Step S202: Determine the set of operating scenarios for the distribution network and the set of system taps for the flexible interconnection devices in the distribution network. The set of operating scenarios represents the distribution of loads and distributed power outputs at each node in the distribution network, and the set of system taps represents the combination of phase shift taps that can be set for the flexible interconnection devices.

[0050] Step S204: Determine the fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories based on the set of operating scenarios and the set of system speed limits.

[0051] Step S206: Determine the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude.

[0052] Step S208: Determine the current setting value corresponding to the directional overcurrent protection device based on the fault current boundary and the preset safety factor.

[0053] Through the above steps S202 to S208, the goal of coordinating operational uncertainties and the adjustment capabilities of flexible interconnection devices under offline conditions is achieved. This enables the directional overcurrent protection setting to be safe, reliable, non-maloperating, non-refusal to operate, and non-overstepping in all scenarios. Furthermore, it solves the technical problem that the directional overcurrent protection setting method in related technologies often determines the fault current boundary based on a single operating condition or experience margin, without considering the operational uncertainties and flexible interconnection adjustment capabilities of the distribution network, resulting in low reliability of the current setting.

[0054] Figure 3 This is a flowchart of another current setting method according to an embodiment of this application, such as... Figure 3 As shown, the two-stage directional overcurrent setting logic based on flexible interconnected distribution networks is illustrated in more detail. Without optimizing the time setting, the adjustability of the flexible interconnection device and considering load uncertainty are used to determine the current setting values ​​for the delay stage and the instantaneous trip stage. This ensures that, under all scenarios, the delay stage avoids normal operating current and reliably initiates faults within the zone; the instantaneous trip stage does not bypass critical faults outside the zone and maintains instantaneous trip capability for faults near the line, thereby reducing the risk of continuous multi-stage disconnections. The following, combined with... Figure 3 The implementation logic described above provides a detailed explanation of steps S202 to S208.

[0055] 1. Construct a set of operational scenarios and a set of faults.

[0056] The determination of the set of operating scenarios for the distribution network in step S202 above includes: acquiring node load data and distributed generation output data of the distribution network; determining the active power injection and reactive power injection of the distribution network nodes based on the node load data and distributed generation output data; determining the probability distribution model corresponding to the active power injection and reactive power injection; and obtaining operating scenario samples from the probability distribution model for cluster analysis to obtain the set of operating scenarios for the distribution network.

[0057] In this embodiment, based on historical measurement or planning forecast data, a probability distribution model can be established for the load and distributed generation output of each node in the distribution network, and a finite set of operating scenarios can be formed using Monte Carlo sampling or quantile discretization methods. For example, in the scene Below, distribution network nodes The injection power is denoted as ,in, For merit injection, For reactive power injection.

[0058] The acquisition of load data from distribution network nodes and output data from distributed generation sources is crucial for accurately reflecting the dynamic characteristics of electricity demand and renewable energy fluctuations within the power grid. Calculating the active and reactive power injections at each node based on this data transforms raw measurements into standardized electrical quantities required for power system analysis, thereby accurately characterizing power flow direction and reactive power support capacity. Determining the probability distribution models corresponding to active and reactive power injections addresses the randomness of distributed generation output and load, employing methods such as the Beta distribution to describe photovoltaic output and the normal distribution to characterize load fluctuations, enabling the models to capture typical probabilistic characteristics in actual operation rather than single operating conditions. Furthermore, using Monte Carlo sampling or quantile discretization methods to extract a large number of operating scenario samples from the probability distribution models and performing cluster analysis avoids redundancy in full-scale simulation calculations while ensuring coverage of extreme but high-probability boundary conditions. Through these operations, the set of operating scenarios no longer relies on human assumptions or static operating conditions but is instead a dynamic expression driven by measured or predicted data, possessing statistical completeness and physical consistency, thus providing accurate and robust input for subsequent fault current amplitude calculations.

[0059] Furthermore, the set of directional overcurrent protection devices that need to be adjusted is clearly defined. For each directional overcurrent protection device Based on the protection device and direction criteria, the following three types of fault sets are constructed: intra-zone fault set. Near-field fault set Set of faults outside the target area (critical faults outside the target area) .in, This includes fault points located inside the protected line and whose direction is determined to be positive; The fault point within the area (e.g., before the line) Within the specified range, this is used to constrain the coverage of the quick-break section; Includes adjacent lines, busbars, or other structures that may be present in the protection device. This is used to suppress instantaneous overcurrent at critical fault points outside the zone where large through-currents are generated.

[0060] 2. Discretize the phase shift settings of the flexible interconnect device (equivalent PST).

[0061] The process of determining the system tap set of flexible interconnection devices in the distribution network in step S202 above includes: determining the set of flexible interconnection devices in the distribution network; determining the discrete tap set corresponding to the set of flexible interconnection devices based on the phase shift angle of each flexible interconnection device; and determining the system tap set based on the discrete tap set.

[0062] Specifically, the set of flexible interconnected devices is denoted as For each flexible interconnect device Given a discrete set of possible phase shift angles. ,in For flexible interconnect devices Number of gears, For the first Phase shift angle.

[0063] Subsequently, the discrete positions of all flexible interconnect devices are combined to form a system position set. Each system gear Corresponding phase shift angle vector ,in Indicates system gear. Flexible interconnect device The phase shift setting and the number of system gears are .

[0064] Through the above operations, a range combination library that is fully matched with the actual control capabilities of the distribution network is systematically constructed, enabling subsequent current setting to cover all potential operating scenarios and device collaborative conditions. This effectively improves the adaptability and reliability of protection settings under bidirectional power flow fluctuations, random changes in distributed power output, and joint regulation of multiple devices, fundamentally avoiding protection maloperation or failure to operate due to incomplete range representation.

[0065] 3. Perform offline power flow and short circuit calculations for each "scenario-gear" combination to generate current lookup table data.

[0066] The step S204 above, which determines the fault current amplitude of the directional overcurrent protection device under different fault categories based on the set of operating scenarios and the set of system taps, includes: determining the normal current amplitude of the directional overcurrent protection device under the target operating scenario and the target system tap, wherein the target operating scenario is any scenario in the set of operating scenarios and the target system tap is any tap in the set of system taps; and determining the fault current amplitude of the directional overcurrent protection device under different fault categories based on the normal current amplitude, wherein the fault categories include at least: intra-zone fault, near-zone fault, and target-zone fault, wherein the target-zone fault is used to indicate a short-circuit fault located in a non-local section coupled to an adjacent feeder, busbar, or flexible interconnection device, but capable of generating the maximum through current at the directional overcurrent protection device.

[0067] Specifically, for each operational scenario and system gear Injecting in the scene and gear The power flow is solved under a given phase shift setting to obtain the normal operating current amplitude of each directional overcurrent protection device, denoted as . .in, Defined as a protective device In the running scenario System gear The current amplitude measured during normal operation.

[0068] Subsequently, in the same operating scenario and system gear Below, based on the pre-fault operating point corresponding to the power flow result (normal current amplitude), for each fault in the fault set... Perform short-circuit calculations to obtain protection devices. In the fault The fault current amplitude is denoted as . ,in .

[0069] By clearly extracting the normal current amplitude under the target operating scenario and target system level, that is, the steady-state current flowing through the protection device under fault-free conditions, caused by the coordinated action of load and distributed power sources and phase shift adjustment by the flexible interconnection device, for example, when the output of a distributed photovoltaic system suddenly increases and the flexible interconnection device switches to the +15° phase shift level, the current amplitude may increase due to the reverse power flow in the line. This value serves as the benchmark starting point for all fault current calculations. Furthermore, the fault categories are clearly distinguished into intra-zone faults, near-zone faults, and target-zone-outside faults. Among them, target-zone-outside faults specifically refer to short circuits that occur in areas outside the line area coupled by adjacent feeders, buses, or flexible interconnection devices, but which will form the maximum possible through-current at the protection device due to the active power through-capacity of the flexible interconnection device. In situations where a three-phase short circuit occurs on an adjacent line, and the flexible interconnection device is operating at its maximum power transmission level, the protection device on this side detects a through current several times higher than the normal current. This design abandons the conservative mode of traditional settings that only considers the single maximum short-circuit current, and instead uses the normal current and the worst through current as dual constraint boundaries. This ensures that the instantaneous overcurrent setting can avoid the most severe out-of-zone through current that may occur under flexible interconnection regulation, thus preventing false tripping and over-leveling. At the same time, it retains the ability to respond quickly to faults in the near zone, ensuring triple protection without relying on remote setting changes: no over-leveling outside the zone, no failure to trip within the zone, and no stalling in the near zone. This fundamentally solves the technical problem in flexible interconnected distribution networks where traditional protection settings cannot balance reliability and selectivity due to the bidirectional power flow and dynamic adjustment of the device.

[0070] 4. Calculate the three types of fault current boundary indices for setting values ​​based on the short-circuit results.

[0071] The step S206 above, which determines the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude, includes: determining the minimum fault current of the directional overcurrent protection device under in-zone faults based on the fault current amplitude, based on the target operating scenario and target system speed; determining the minimum fault current of the directional overcurrent protection device under near-zone faults based on the fault current amplitude; and determining the maximum fault through-current of the directional overcurrent protection device under faults outside the target zone based on the fault current amplitude. The maximum fault through-current is used to constrain the over-level operation of the directional overcurrent protection device under faults outside the target zone.

[0072] Specifically, for each Calculate the minimum fault current under intra-zone fault conditions. Defined as ,in, Indicates directional overcurrent protection device The lower limit of the most unfavorable current for faults within its zone is used to ensure that the protection device can still start reliably under the most unfavorable fault conditions within the zone. For example, when the output of the distributed power source is low and the load is heavy, the fault current is suppressed to a critical level, and this minimum value is used as the reference for the lower limit of the instantaneous trip section.

[0073] For each Calculate the minimum fault current under near-field fault conditions. Defined as ,in, This is used to ensure that the fast-acting section has a margin of operation for faults in the near zone of the line. That is, when a fault occurs at a certain distance downstream of the installation point of the protection device (such as 10%-20% before the end of the line), the minimum fault current that can be measured after considering the line impedance attenuation, the phase shift regulation of the flexible interconnection device, and the reverse support of the distributed power source.

[0074] For each Calculate the maximum fault ride-through current under an external fault (external critical fault). Defined as ,in, This is used to constrain the fast-break section from overshooting during critical faults outside the zone, thereby reducing the risk of multiple consecutive disconnections. Specifically, it is the maximum external fault through-current that the protection device can withstand when a short-circuit fault occurs outside the boundary of an adjacent protection zone and the flexible interconnection device injects current into the line on this side in reverse due to phase shift adjustment.

[0075] It should be noted that the maximum fault through-current is used to constrain the directional overcurrent protection device from over-level operation under faults outside the target area. This means that when setting the current setting value, it must be ensured that the operating threshold of the instantaneous trip section is lower than the maximum through-current. Thus, even if there is backflow during external faults, it will not trip falsely. At the same time, it is combined with the minimum fault current in the zone and the near zone to construct a dual-limit setting logic with upper limit control and lower limit sensitivity protection. This enables the protection device to reliably and quickly switch near zone and in-zone faults in complex bidirectional power flow and multi-source uncertain environment, while strictly avoiding over-level tripping caused by external fault through-current. This achieves the coordinated achievement of the three objectives of no false tripping, no failure to trip, and no over-level tripping.

[0076] 5. Establish a robust tuning optimization model and solve for the two-stage current setting.

[0077] The step S208 above, which determines the current setting corresponding to the directional overcurrent protection device based on the fault current boundary and the preset safety factor, includes: obtaining a preset margin variable, wherein the preset margin variable is used to improve the robustness margin of the current setting; determining the setting boundary corresponding to the current setting, wherein the setting boundary includes a first setting boundary corresponding to the current setting during the delay period and a second setting boundary corresponding to the current setting during the instantaneous trip; and determining the current setting during the delay period and the current setting during the instantaneous trip corresponding to the directional overcurrent protection device based on the target constraint conditions, the preset margin variable, the preset safety factor, and the setting boundary. The target constraint conditions are determined in the following way: determining binary variables corresponding to the target operating scenario and the target system gear; and determining the target constraint conditions based on the binary variables, wherein the target constraint conditions are used to maximize the robustness margin of the current setting.

[0078] In this embodiment, by constructing a mixed-integer linear programming (MILP) model with the objective of maximizing minimum robustness margin, it is possible to uniformly coordinate the four protection constraints of "load avoidance, in-zone sensitivity, out-of-zone blocking, and near-zone fast operation" under offline conditions. This achieves global optimization and reproducible intelligent setting of the two-stage directional overcurrent protection settings in flexible interconnected distribution networks. The overall process is as follows: Figure 4 As shown, it includes the following steps:

[0079] S1: The current setpoint during the delay period is denoted as... The instantaneous overcurrent setting is denoted as ( Introducing robust margin variables (i.e., pre-defined margin variables). .

[0080] Meanwhile, during the setting process, in order to allow for the selection of the optimal phase shift level of the flexible interconnect device for different permissible scenarios, thereby maximizing the safety margin of the protection current setting across all scenarios without relying on online adjustments, for each and Define the corresponding binary variable ,in Indicates the running scenario Select system gear Otherwise, the value is 0, and a unique objective constraint is applied. This ensures that each operating scenario corresponds to only one selected system gear combination, avoiding logical conflicts caused by multiple combinations taking effect simultaneously, and making the tuning results have the strongest anti-disturbance capability and adaptability across the entire scenario coverage.

[0081] S2: Set the load-side safety factor to... This is used to cover measurement errors and operational fluctuations to avoid malfunctions during normal operation in the delayed period, and requires that in all... and All of the following conditions must be met:

[0082]

[0083] in, This refers to the normal current amplitude of the directional overcurrent protection device.

[0084] S3: Set the sensitivity factor for the delay period to... To ensure that no faults within the area are ignored during the extended period, it is required that all... All of the following conditions must be met:

[0085]

[0086] in, This is the minimum fault current for the directional overcurrent protection device under fault conditions within the zone.

[0087] S4: Set the safety factor for not skipping levels outside the quick-break section to [value]. To prevent the instantaneous tripping section from tripping beyond its cascade during a critical fault outside the zone, it is required that all... All of the following conditions must be met:

[0088]

[0089] in, This represents the maximum fault ride-through current of the directional overcurrent protection device under fault conditions outside the target area.

[0090] S5: Set the safety factor of the sensitive side of the quick-break section to [value]. To ensure that the fast-acting section maintains its fast-acting capability in the face of faults near the line, it is required that in all... All of the following conditions must be met:

[0091]

[0092] in, This is the minimum fault current for a directional overcurrent protection device under near-zone fault conditions.

[0093] S6: To satisfy the two-stage fixed-value logic, for each Apply constraints The upper and lower limits (setting boundaries) of the setpoints are given according to the device specifications: (First constant boundary) and (Second constant boundary), where, These are predefined, known parameters.

[0094] S7: Solve the above optimization problem with the objective of maximizing robustness margin. Let the objective function be... Calculate based on the preset safety factor and constraints given in steps S2 to S6. and .

[0095] It should be noted that the above constraints are all linear inequalities and only contain binary choice variables. Therefore, this problem belongs to mixed integer linear programming, and the globally optimal current constant value solution can be obtained under the assumption of discrete gear positions.

[0096] 6. Set the output current value and perform full-scenario verification and necessary tuning iterations, such as... Figure 5 As shown.

[0097] first, The verification process includes: verifying the current setting value of the time delay period and the current setting value of the instantaneous trip section to obtain the first verification result; if the first verification result indicates that the current setting value of the time delay period and the current setting value of the instantaneous trip section have passed the verification, determining the current setting value of the time delay period and the current setting value of the instantaneous trip section as the current setting value corresponding to the directional overcurrent protection device; if the first verification result indicates that the current setting value of the time delay period or the current setting value of the instantaneous trip section has failed the verification, optimizing the current setting value of the time delay period or the current setting value of the instantaneous trip section.

[0098] Specifically, the calculated Substitute the values ​​from steps S2 to S6 above for verification and confirm the current setting during the delay period. To meet the requirements of load avoidance and in-zone sensitivity, the delay period must reliably avoid the maximum load current and the reverse current from the distributed power source to prevent malfunctions due to load fluctuations, while ensuring sensitive startup even in the event of minor faults such as high-resistance grounding within the zone; and the instantaneous trip current setting... The requirements are to ensure that the protection does not exceed the required level outside the protection zone and can trip instantly in the nearby zone. This means the instantaneous trip section must guarantee that it will not trip under the most unfavorable fault outside the protection zone (such as a short circuit at the end of an adjacent line), and that it can trip instantaneously in the event of a metallic short circuit at the beginning of the current line. If any condition is not met during the verification process, the protection is deemed unsuccessful. For example, if the flexible interconnection device switches to the maximum phase shift setting, causing a surge in reverse power flow, resulting in the originally set delay current setting being lower than the maximum reverse current, or the instantaneous trip current setting being lower than the fault current at the end of an adjacent feeder, the optimization process will be triggered. This involves dynamically adjusting the setting parameters or introducing scenario weighting to recalculate until all protection logic boundaries are met.

[0099] Secondly, for The verification process includes: verifying the preset margin variable to obtain a second verification result; if the second verification result indicates that the preset margin variable is greater than 0, determining the current setting value of the delay period and the current setting value of the instantaneous trip section as the current setting value corresponding to the directional overcurrent protection device; if the second verification result indicates that the preset margin variable is equal to 0, optimizing the current setting value of the delay period and the current setting value of the instantaneous trip section according to the preset conflict rules.

[0100] Specifically, the calculated Substitute the above steps S2 to S6 for verification. When this occurs, it indicates that there is a clear setting margin within the coverage area of ​​the operating scenario, meaning the current setting has sufficient anti-interference capability and requires no adjustment; when When this occurs, it indicates that the current setpoint is in a critically feasible state and requires optimization. Specific optimizations are as follows:

[0101] The system identifies the source of conflicts based on preset conflict rules: if the main conflict originates from the instantaneous tripping section, it typically manifests as the difficulty in simultaneously satisfying "no overshooting outside the zone" and "instantaneous tripping within the zone." This can be addressed by adjusting the near-zone range, supplementing key fault points outside the zone, or refining the discrete accuracy of the tripping levels before re-performing offline calculations for power flow and short circuits. If the main conflict originates from the delayed tripping section, it typically manifests as the overlap between the boundaries of "load avoidance" and "sensitivity within the zone." This can be addressed by adjusting the scenario coverage method or refining the discrete accuracy of the tripping levels before re-performing offline calculations for power flow and short circuits. Through this differentiated response mechanism based on margin status, the system can intelligently distinguish between two types of setting states: "sufficient safety redundancy" and "critically feasible." In the latter, it proactively corrects potential overshooting risks, thereby significantly improving the adaptability and overall reliability of directional overcurrent protection in flexible interconnected distribution networks to bidirectional power flow, power supply uncertainty, and device regulation disturbances without increasing communication dependence or real-time computing burden.

[0102] Overall, this application is the first to deeply integrate the multi-level adjustable characteristics of flexible interconnected devices, the uncertain operating scenarios of loads and distributed power sources, and the hard constraints of cross-current for critical faults outside the protection zone. By constructing an offline lookup table mechanism of "scenario + level" and a mixed integer linear programming optimization model, it achieves adaptive collaborative optimization of current setting under the entire operating boundary without relying on remote online setting. It improves the robustness to load fluctuations and power output changes by maximizing the minimum robustness margin, effectively suppresses instantaneous overcurrent and avoids continuous multi-stage disconnection by using cross-current constraints outside the protection zone, and flexibly matches the optimal device level under different scenarios using binary selection variables. This significantly breaks through the limitations of traditional methods that are only based on a single operating condition or experience margin and cannot take into account both sensitivity and selectivity. It realizes a paradigm shift in protection setting from static experience to dynamic scenario-driven, offline auditable, and globally optimal.

[0103] According to embodiments of this application, a current setting device is provided. It should be noted that the current setting device of this application can be used to execute the current setting method provided in the embodiments of this application. The current setting device provided in the embodiments of this application will be described below.

[0104] Figure 6 This is a structural diagram of a current setting device according to an embodiment of this application. Figure 6 As shown, the device includes:

[0105] The first determining module 60 is used to determine the set of operating scenarios of the distribution network and the set of system taps of the flexible interconnection device in the distribution network. The set of operating scenarios is used to represent the distribution of load and distributed power output of each node in the distribution network, and the set of system taps is used to represent the combination of phase shift taps that can be set by the flexible interconnection device.

[0106] The second determining module 62 is used to determine the fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories based on the set of operating scenarios and the set of system speeds.

[0107] The second determining module 64 is used to determine the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude.

[0108] The fourth determining module 66 is used to determine the current setting value corresponding to the directional overcurrent protection device based on the fault current boundary and the preset safety factor.

[0109] Through the first determining module, the second determining module, the second determining module 62, and the fourth determining module in the aforementioned current setting device, the goal of coordinating operational uncertainties and the adjustment capabilities of flexible interconnection devices under offline conditions is achieved. This enables the directional overcurrent protection setting to be safe, reliable, non-maloperating, non-refusal to operate, and non-overstepping in all scenarios. Furthermore, it solves the technical problem that the directional overcurrent protection setting method in related technologies often determines the fault current boundary based on a single operating condition or empirical margin, without considering the operational uncertainties and flexible interconnection adjustment capabilities of the distribution network, resulting in low reliability of current setting.

[0110] In the current setting device provided in this application embodiment, the first determining module is further used to acquire node load data and distributed power output data of the distribution network; determine the active power injection power and reactive power injection power of the distribution network nodes based on the node load data and distributed power output data; determine the probability distribution model corresponding to the active power injection power and reactive power injection power; and obtain operation scenario samples from the probability distribution model for cluster analysis to obtain a set of operation scenarios of the distribution network.

[0111] In the current setting device provided in the embodiments of this application, the first determining module is further used to determine the set of flexible interconnection devices in the distribution network; determine the discrete tap set corresponding to the set of flexible interconnection devices based on the phase shift angle of each flexible interconnection device; and determine the system tap set based on the discrete tap set.

[0112] In the current setting device provided in this application embodiment, the second determining module is further used to determine the normal current amplitude of the directional overcurrent protection device under the target operating scenario and the target system level, wherein the target operating scenario is any scenario in the set of operating scenarios, and the target system level is any level in the set of system levels; the fault current amplitude of the directional overcurrent protection device under different fault categories is determined based on the normal current amplitude, wherein the fault categories include at least: in-zone fault, near-zone fault and target-zone fault, wherein the target-zone fault is used to indicate a short-circuit fault located in a non-local section coupled to an adjacent feeder, busbar or flexible interconnection device, but capable of generating the maximum through current at the directional overcurrent protection device.

[0113] In the current setting device provided in this application embodiment, the third determining module is further used to determine the minimum fault current of the directional overcurrent protection device under fault within the zone based on the target operating scenario and the target system level, according to the fault current amplitude; and to determine the minimum fault current of the directional overcurrent protection device under near-zone fault based on the fault current amplitude; and to determine the maximum fault through-current of the directional overcurrent protection device under fault outside the target zone based on the fault current amplitude, wherein the maximum fault through-current is used to constrain the over-level operation of the directional overcurrent protection device under fault outside the target zone.

[0114] In the current setting device provided in this application embodiment, the fourth determining module is further used to determine the binary variable corresponding to the target operating scenario and the target system gear; and to determine the target constraint condition based on the binary variable, wherein the target constraint condition is used to maximize the robustness margin of the current setting.

[0115] In the current setting device provided in this application embodiment, the fourth determining module is further used to obtain a preset margin variable, wherein the preset margin variable is used to improve the robustness margin of the current setting; determine the setting boundary corresponding to the current setting, wherein the setting boundary includes a first setting boundary corresponding to the current setting during the delay period and a second setting boundary corresponding to the current setting during the instantaneous trip; and determine the current setting during the delay period and the current setting during the instantaneous trip corresponding to the directional overcurrent protection device based on the target constraint conditions, the preset margin variable, the preset safety factor and the setting boundary.

[0116] The current setting device provided in this application embodiment also includes a verification module 68, which is used to verify the current setting value of the delay period and the current setting value of the instantaneous trip section to obtain a first verification result; if the first verification result indicates that the current setting value of the delay period and the current setting value of the instantaneous trip section have passed the verification, the current setting value of the delay period and the current setting value of the instantaneous trip section are determined as the current setting value corresponding to the directional overcurrent protection device; if the first verification result indicates that the current setting value of the delay period or the current setting value of the instantaneous trip section has failed the verification, the current setting value of the delay period or the current setting value of the instantaneous trip section is optimized.

[0117] In the current setting device provided in this application embodiment, the verification module is further used to verify the preset margin variable and obtain a second verification result; when the second verification result indicates that the preset margin variable is greater than 0, the current setting value of the delay period and the current setting value of the instantaneous trip section are determined as the current setting value corresponding to the directional overcurrent protection device; when the second verification result indicates that the preset margin variable is equal to 0, the current setting value of the delay period and the current setting value of the instantaneous trip section are optimized according to the preset conflict rules.

[0118] This application also provides an electronic device, including: a memory and a processor, wherein the memory is used to store program instructions; and the processor is connected to the memory and used to execute the above-described current setting method.

[0119] It should be noted that the aforementioned electronic equipment is used to perform Figure 2 The current setting method shown above is also applicable to this electronic device, and will not be repeated here.

[0120] This application also provides a non-volatile storage medium, which includes a stored computer program, wherein the device containing the non-volatile storage medium executes the above-described current setting method by running the computer program.

[0121] It should be noted that the aforementioned non-volatile storage media is used for execution. Figure 2 The current setting method shown above is also applicable to this non-volatile storage medium, and will not be repeated here.

[0122] This application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the above-described current setting method.

[0123] It should be noted that the above-mentioned computer program product is used to execute Figure 2 The current setting method shown above is also applicable to this computer program product, and will not be repeated here.

[0124] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0125] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0127] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0128] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0129] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0130] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for setting a current setpoint, characterized in that, include: The set of operating scenarios for the distribution network and the set of system taps for the flexible interconnection devices in the distribution network are determined. The set of operating scenarios represents the distribution of load and distributed power output at each node in the distribution network, and the set of system taps represents the settable phase shift tap combinations for the flexible interconnection devices. The fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories is determined based on the set of operating scenarios and the set of system speed limits. The fault current boundaries of the directional overcurrent protection device under different fault categories are determined based on the fault current amplitude. The current setting value corresponding to the directional overcurrent protection device is determined based on the fault current boundary and the preset safety factor.

2. The method according to claim 1, characterized in that, Determine the set of operating scenarios for the distribution network, including: Obtain the node load data and distributed generation output data of the power distribution network; The active power injection and reactive power injection of the distribution network nodes are determined based on the node load data and the distributed power output data. Determine the probability distribution model corresponding to the active power injection and the reactive power injection; The operation scenario samples obtained from the probability distribution model are subjected to cluster analysis to obtain the set of operation scenarios for the power distribution network.

3. The method according to claim 1, characterized in that, Determining the system tap set of flexible interconnection devices in the distribution network includes: Determine the set of flexible interconnection devices in the power distribution network; A discrete gear set corresponding to the set of flexible interconnect devices is determined based on the phase shift angle of each flexible interconnect device. The system gear set is determined based on the discrete gear set.

4. The method according to claim 1, characterized in that, Based on the set of operating scenarios and the set of system speed limits, the fault current amplitude of the directional overcurrent protection device in the distribution network under different fault categories is determined, including: Determine the normal current amplitude of the directional overcurrent protection device under the target operating scenario and the target system speed, wherein the target operating scenario is any scenario in the set of operating scenarios, and the target system speed is any speed in the set of system speeds; The fault current amplitude of the directional overcurrent protection device under different fault categories is determined based on the normal current amplitude. The fault categories include at least: in-zone fault, near-zone fault, and target-zone fault. The target-zone fault is used to indicate a short-circuit fault located in a non-local section coupled to an adjacent feeder, busbar, or flexible interconnection device, but capable of generating the maximum through current at the directional overcurrent protection device.

5. The method according to claim 4, characterized in that, Determining the fault current boundaries of the directional overcurrent protection device under different fault categories based on the fault current amplitude includes: Based on the target operating scenario and the target system gear, the minimum fault current of the directional overcurrent protection device under the fault in the zone is determined according to the fault current amplitude. And determine the minimum fault current of the directional overcurrent protection device under the near-zone fault based on the fault current amplitude; And based on the fault current amplitude, determine the maximum fault ride-through current of the directional overcurrent protection device under the fault outside the target area, wherein the maximum fault ride-through current is used to constrain the over-level operation of the directional overcurrent protection device under the fault outside the target area.

6. The method according to claim 5, characterized in that, The method further includes: Determine the binary variables corresponding to the target operating scenario and the target system gear; The target constraint is determined based on the binary variable, wherein the target constraint is used to maximize the robustness margin of the current setpoint.

7. The method according to claim 6, characterized in that, The current setting value corresponding to the directional overcurrent protection device is determined based on the fault current boundary and the preset safety factor, including: Obtain a preset margin variable, wherein the preset margin variable is used to improve the robustness margin of the current setting; Determine the setpoint boundaries corresponding to the current setpoint, wherein the setpoint boundaries include a first setpoint boundary corresponding to the current setpoint during the delay period and a second setpoint boundary corresponding to the current setpoint during the instantaneous trip. Based on the target constraints, the preset margin variables, the preset safety factor, and the setpoint boundary, determine the time delay current setpoint and the instantaneous trip current setpoint corresponding to the directional overcurrent protection device.

8. The method according to claim 7, characterized in that, The method further includes: The current setting value of the delay period and the current setting value of the instantaneous trip section are checked and verified to obtain the first verification result; If the first verification result indicates that the current setting value of the delay period and the current setting value of the instantaneous trip section have passed the verification, the current setting value of the delay period and the current setting value of the instantaneous trip section shall be determined as the current setting value corresponding to the directional overcurrent protection device. If the first verification result indicates that the current setting value of the delay period or the current setting value of the instantaneous trip section has failed the verification, the current setting value of the delay period or the current setting value of the instantaneous trip section shall be optimized.

9. The method according to claim 7, characterized in that, The method further includes: The preset margin variable is reviewed and verified to obtain a second verification result; If the second verification result indicates that the preset margin variable is greater than 0, the current setting value of the delay period and the current setting value of the instantaneous trip section are determined as the current setting value corresponding to the directional overcurrent protection device. If the second verification result indicates that the preset margin variable is equal to 0, the current setting value of the delay period and the current setting value of the fast-break period are optimized according to the preset conflict rules.

10. A current setting device, characterized in that, include: The first determining module is used to determine the set of operating scenarios of the distribution network and the set of system taps of the flexible interconnection device in the distribution network. The set of operating scenarios is used to represent the distribution of load and distributed power output of each node in the distribution network, and the set of system taps is used to represent the phase shift tap combinations that can be set by the flexible interconnection device. The second determining module is used to determine the fault current amplitude of the directional overcurrent protection device in the power distribution network under different fault categories based on the set of operating scenarios and the set of system speeds. The third determining module is used to determine the fault current boundary of the directional overcurrent protection device under different fault categories based on the fault current amplitude. The fourth determining module is used to determine the current setting value corresponding to the directional overcurrent protection device based on the fault current boundary and the preset safety factor.

11. An electronic device, characterized in that, include: A memory and a processor, wherein the memory is used to store program instructions; The processor, connected to the memory, is used to execute the current setting method according to any one of claims 1 to 9.

12. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored computer program, wherein the device containing the non-volatile storage medium executes the current setting method according to any one of claims 1 to 9 by running the computer program.

13. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the current setting method according to any one of claims 1 to 9.

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