A new energy distribution network fault prediction and health management system and method

Abstract

The application relates to the technical field of power distribution network fault detection management, in particular to a new energy power distribution network fault prediction and health management system and method; the system comprises the following steps: acquiring power distribution network structure data and operation data, determining a target power supply area and a candidate branch set, constructing a closed conversion task, and generating a branch conversion participation sequence of each candidate branch; executing each closed conversion task, keeping the new energy grid-connected unit control setting unchanged, adjusting the energy storage unit output to meet the endpoint power supply constraint, completing forward conversion and reverse conversion, and generating return compensation deviation data; determining a backhaul closing result according to the return compensation deviation data, generating a task backhaul result sequence and checking with each branch conversion participation sequence bit by bit, and determining a target fault branch; gradually reducing the transfer current amplitude and repeatedly executing the backhaul unclosed task, determining a health boundary current, and generating a health management result. The application realizes online positioning and health boundary quantification of an implicit fault branch.

Description

Technical Field

[0001] This invention relates to the field of power distribution network fault detection and management technology, specifically to a fault prediction and health management system and method for new energy power distribution networks. Background Technology

[0002] New energy distribution networks typically integrate distributed photovoltaic and wind power generation units, and are equipped with energy storage units, distribution switches, and multiple switchable power supply branches to achieve new energy consumption, continuous load power supply, and power supply path adjustment. As new energy output fluctuates, load changes, and distribution network operation modes frequently switch, the branch connection status, current carrying capacity, and power supply recovery capability will change over time. Existing distribution network fault detection is usually based on operating data such as voltage, current, power, and switch status to identify obvious faults such as short circuits, grounding, overcurrent, and undervoltage, and to carry out branch maintenance and operation status management based on the detection results. In operational scenarios where new energy grid-connected units, energy storage units, and multiple power supply branches jointly participate in the supply of target loads, there are still problems such as the difficulty in accurately locating hidden branch anomalies in the new energy distribution network under continuous power supply conditions, and the difficulty in quantifying the remaining power supply capacity of abnormal branches. Specifically, on the one hand, anomalies such as branch contact degradation, loose connections, increased impedance, and decreased local current carrying capacity are not likely to form obvious overcurrent or undervoltage characteristics when the load level is low. Changes in new energy output and energy storage output regulation will also compensate for some electrical deviations, and the abnormal response may be transmitted along multiple power supply paths, making it difficult to determine the actual abnormal branch based on changes in single operating parameters. On the other hand, some abnormal branches have not completely lost their power supply capacity, but only when the scale of power supply current transfer is large, the power supply status is difficult to restore. The existing normal and fault status judgments are difficult to reflect the maximum scale of power supply current transfer that the branch can currently withstand, thus making it difficult to determine the actual health boundary of the abnormal branch. Summary of the Invention

[0003] The purpose of this invention is to provide a fault prediction and health management system and method for new energy distribution networks, so as to solve the problems mentioned in the background art, which are difficult to accurately locate hidden branch anomalies in new energy distribution networks under continuous power supply conditions and difficult to quantify the remaining power supply capacity of abnormal branches.

[0004] To achieve the above objectives, the invention aims to provide a new energy distribution network fault prediction and health management system, comprising: The closed-loop transfer task generation unit is used to acquire distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed-loop transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. Among them, the closed-loop current transfer task is used to detect whether the candidate branch can restore the initial power supply state after the power supply current is transferred and returned; the power supply participation status indicates whether the candidate branch participates in the power supply of the target load; the branch current transfer participation sequence is a power supply participation status identifier sequence formed according to the order of the closed-loop current transfer task; the transfer current amplitude is the current value of the scale of power supply current transfer in the closed-loop current transfer task; The closed-loop current transfer execution unit is used to execute each closed-loop current transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward current transfer and reverse current transfer according to the same transfer current amplitude. In the return power supply state, it generates return compensation deviation data. Among them, forward current transfer is the process of transferring the power supply current corresponding to the target load from the initial power supply path to the alternative power supply path; reverse current transfer is the process of transferring the power supply current from the alternative power supply path back to the initial power supply path; return compensation deviation data is the data on the deviation of the compensation amount required to maintain the initial power supply state after the reverse current transfer is completed from the initial compensation state. The return verification fault location unit is used to determine the return closure result of each closed-loop transfer task based on the return compensation deviation data and the allowable range of compensation deviation, and generate a task return result sequence according to the task order. The task return result sequence is checked against the transfer participation sequence of each branch line by line, and the candidate branches with the same sequence are identified as the target fault branches. Among them, the return closure result is the result of whether the target power supply area has returned to the initial power supply state after the completion of the closed current transfer task; the task return result sequence is the ordered result of whether each closed current transfer task has completed the return closure. The health boundary management unit is used to progressively reduce the transfer current amplitude of the unclosed return path task corresponding to the target fault branch and repeat the process. The transfer current amplitude that first makes all closed transfer tasks return path closed is determined as the health boundary current, and a health management result is generated. Among them, the health boundary current is the maximum verified transfer current of the target fault branch during the process of gradually reducing the transfer current to complete the return loop closure.

[0005] Preferably, in the closed-loop transfer task generation unit, the closed-loop transfer task is a task executed sequentially according to the initial power supply state, the alternative power supply state, and the return power supply state. Each closed-loop transfer task is configured with a closed-loop transfer task identifier and a task sequence number, and the task sequence is formed according to the task sequence number. The initial power supply state is the state in which the target load is powered by the initial power supply path and the distribution switch is in the initial distribution switch configuration. The alternative power supply state is the state in which the target load is powered by an alternative power supply path different from the initial power supply path and the distribution switch is in the alternative distribution switch configuration. The return power supply state is the state in which the distribution switch returns to the initial distribution switch configuration after the target load completes the alternative power supply. The determination of the transfer current amplitude includes: determining the available current carrying capacity of the alternative power supply path based on the branch rated current carrying capacity in the distribution network structure data and the current branch current in the distribution network operation data, and determining the transfer current amplitude corresponding to each closed-loop transfer task within the range not exceeding the target load operating current and the available current carrying capacity.

[0006] Preferably, in the closed-loop transfer task generation unit, the candidate branch is a distribution branch within the target power supply area whose power supply participation state changes between the initial power supply state and the alternative power supply state of at least one closed-loop transfer task; the power supply participation state includes a participating state and a non-participating state. A candidate branch is determined to be in a participating state when it is located in the target load power supply path under the corresponding power supply state, and is determined to be in a non-participating state when it is not located in the power supply path; generating a branch transfer participation sequence corresponding to each candidate branch specifically includes: for each candidate branch, comparing the power supply participation state of the candidate branch under the initial power supply state and the alternative power supply state of each closed-loop transfer task, generating a change identifier when the power supply participation state changes, generating a hold identifier when the power supply participation state remains the same, arranging the change identifiers and hold identifiers according to the task order, generating a branch transfer participation sequence corresponding to the candidate branch, and ensuring that the position of each sequence corresponds one-to-one with the task number of each closed-loop transfer task; the branch transfer participation sequences corresponding to each candidate branch are different from each other.

[0007] Preferably, in the closed-loop transfer execution unit, the new energy grid-connected unit is a new energy power supply device that connects to the target power supply area and outputs electrical energy to the distribution network according to the control settings; the energy storage unit is an energy storage device that connects to the target power supply area and participates in the power supply regulation of the target load by adjusting the charging and discharging output; the endpoint power supply constraint is a power supply constraint preset according to the rated voltage and continuous power supply requirements of the target load, including the target load end voltage constraint and the target load continuous power supply constraint; each closed-loop transfer task is executed sequentially according to the task sequence, and the output of the energy storage unit is adjusted while keeping the control settings of the new energy grid-connected unit unchanged, so that the target power supply area sequentially enters the alternative power supply state and the return power supply state.

[0008] Preferably, in the closed-loop current transfer execution unit, forward current transfer and reverse current transfer are performed according to the same transfer current amplitude. Specifically, this includes: for the same closed-loop current transfer task, configuring a replacement distribution switch and adjusting the output of the energy storage unit so that the power supply current corresponding to the target load is transferred from the initial power supply path to the replacement power supply path, and the amplitude of the transferred power supply current reaches the transfer current amplitude corresponding to the closed-loop current transfer task; after the target power supply area enters the replacement power supply state, configuring a return distribution switch and adjusting the output of the energy storage unit so that the power supply current of the same amplitude returns from the replacement power supply path to the initial power supply path; and when performing the closed-loop current transfer... Before the flow task, the initial energy storage output of the energy storage unit is obtained when it meets the endpoint power supply constraints in the initial power supply state, and the initial energy storage output is determined as the initial compensation state. After entering the return power supply state, the energy storage return output formed by the energy storage unit to meet the endpoint power supply constraints is obtained during the return verification period. A compensation deviation value is generated based on the difference between the energy storage return output and the energy storage initial output. The closed flow task identifier, the energy storage initial output, the energy storage return output, and the compensation deviation value are associated to generate return compensation deviation data. The return verification period is a preset data acquisition period after the target power supply area enters the return power supply state.

[0009] Preferably, in the return verification fault location unit, the allowable range of compensation deviation is the allowable variation range of compensation deviation corresponding to the target power supply area, including a lower limit and an upper limit, used to verify whether the compensation deviation in the return power supply state meets the return closure condition; the allowable range of compensation deviation is determined based on the return compensation deviation data obtained by performing a closed-loop transfer task in the target power supply area under normal operating conditions, and each closed-loop transfer task corresponding to the same target power supply area adopts the same allowable range of compensation deviation; the return closure result includes return closure and return non-closure, used to characterize the state after the closed-loop transfer task enters the return power supply state. Whether to restore the initial power supply state; determine the return closure result of each closed-loop transfer task based on the returned compensation deviation data and the allowable compensation deviation range, specifically including: reading the compensation deviation value from each returned compensation deviation data, comparing the compensation deviation value with the allowable compensation deviation range of the corresponding target power supply area, and determining the return closure result of the corresponding closed-loop transfer task as a return closure when the compensation deviation value is within the allowable compensation deviation range, and determining the return closure result of the corresponding closed-loop transfer task as a return non-closure when the compensation deviation value is not within the allowable compensation deviation range, and associating the return closure result with the corresponding closed-loop transfer task identifier.

[0010] Preferably, in the backhaul verification fault location unit, the task backhaul result sequence is a sequence formed by arranging the change identifiers and hold identifiers corresponding to each closed-loop switching task according to the task order, used for position-by-position verification with the branch switching participation sequence corresponding to each candidate branch; generating the task backhaul result sequence specifically includes: generating a change identifier when the backhaul closure result of the closed-loop switching task is a backhaul not closed, generating a hold identifier when the backhaul closure result of the closed-loop switching task is a backhaul closed, arranging the generated change identifiers and hold identifiers according to the task sequence number of each closed-loop switching task to obtain the task backhaul result sequence; each sequence position of the task backhaul result sequence corresponds to a closed-loop switching task, the task backhaul result sequence has the same sequence length as each branch switching participation sequence, and the same sequence position of the task backhaul result sequence and the branch switching participation sequence corresponds to the same closed-loop switching task.

[0011] Preferably, in the backhaul verification fault location unit, the target fault branch is a candidate branch whose branch transfer participation sequence matches the task backhaul result sequence position by position. Specifically, the task backhaul result sequence is checked position by position against each branch transfer participation sequence, and candidate branches with identical sequences are identified as the target fault branch. This includes: sequentially selecting identical sequence positions in the task backhaul result sequence and each branch transfer participation sequence according to the task order; comparing the change and hold indicators in the identical sequence positions; and determining the candidate branch as a matching candidate branch when all sequence positions of the branch transfer participation sequence corresponding to a candidate branch have the same indicator as all sequence positions of the task backhaul result sequence. Based on the fact that the branch transfer participation sequences corresponding to each candidate branch are different, the unique matching candidate branch is identified as the target fault branch.

[0012] Preferably, in the health boundary management unit, the unclosed return path task is a closed transfer task in the branch transfer sequence corresponding to the target fault branch, where the position of the identifier in the sequence is changed and the return path closure result is an unclosed return path task. Determining the health boundary current specifically includes: reading the currently configured transfer current amplitude of each unclosed return path task, determining the minimum value as the starting test current, generating a current level sequence with progressively decreasing current values ​​based on the starting test current, setting the transfer current amplitude of each unclosed return path task to the current test current according to the current level sequence, and repeatedly executing each unclosed return path task; when each unclosed return path task first forms a return path closure result, determining the corresponding current test current as the health boundary current; reading the current operating current of the target fault branch from the distribution network operation data, generating a branch health margin based on the difference between the health boundary current and the current operating current, and associating the target fault branch identifier, health boundary current, and branch health margin to generate a health management result.

[0013] On the other hand, the present invention provides a method for fault prediction and health management of a new energy distribution network, used in the aforementioned new energy distribution network fault prediction and health management system, comprising the following steps: S1. Obtain distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed current transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch current transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. S2. Execute each closed-loop transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward and reverse transfer according to the same transfer current amplitude. Generate return compensation deviation data in the return power supply state. S3. Determine the return closure result of each closed-loop transfer task based on the returned compensation deviation data and the allowable range of compensation deviation, and generate the task return result sequence according to the task order. Verify the task return result sequence with the transfer participation sequence of each branch one by one, and determine the candidate branches with the same sequence as the target fault branches. S4. For the back-loop unclosed task corresponding to the target fault branch, gradually reduce the transfer current amplitude and repeat the process. The transfer current amplitude that makes all closed transfer tasks close back-loop for the first time is determined as the health boundary current, and health management results are generated.

[0014] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: 1. In this invention, the power supply current of the target load is transferred and returned in equal amplitude based on the closed-loop current transfer task, and the task return result sequence is checked with the current transfer participation sequence of each branch. This can trigger and locate the hidden anomaly of the candidate branch while maintaining continuous power supply to the target load. 2. In this invention, by progressively reducing the transfer current amplitude of the task corresponding to the target fault branch and repeatedly performing back-loop closure verification, the maximum verified transfer current of the target fault branch is determined, thereby quantifying the health boundary of the target fault branch. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of the present invention; Reference numerals in the attached diagram: 1. Closed-loop task generation unit; 2. Closed-loop execution unit; 3. Return verification fault location unit; 4. Health boundary management unit. Detailed Implementation

[0016] Example 1, as Figure 1 As shown, a fault prediction and health management system for a new energy distribution network is provided, including: Closed-loop transfer task generation unit 1 is used to acquire distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed-loop transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. Among them, the closed-loop current transfer task is used to detect whether the candidate branch can restore the initial power supply state after the power supply current is transferred and returned; the power supply participation status indicates whether the candidate branch participates in the power supply of the target load; the branch current transfer participation sequence is a power supply participation status identifier sequence formed according to the order of the closed-loop current transfer task; the transfer current amplitude is the current value of the scale of power supply current transfer in the closed-loop current transfer task; Closed-loop current transfer execution unit 2 is used to execute each closed-loop current transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward current transfer and reverse current transfer according to the same transfer current amplitude, and generate return compensation deviation data in the return power supply state; Among them, forward current transfer is the process of transferring the power supply current corresponding to the target load from the initial power supply path to the alternative power supply path; reverse current transfer is the process of transferring the power supply current from the alternative power supply path back to the initial power supply path; return compensation deviation data is the data on the deviation of the compensation amount required to maintain the initial power supply state after the reverse current transfer is completed from the initial compensation state. The return verification fault location unit 3 is used to determine the return closure result of each closed transfer task based on the return compensation deviation data and the allowable range of compensation deviation, and generate a task return result sequence according to the task order. The task return result sequence is checked against the transfer participation sequence of each branch line, and the candidate branches with the same sequence are identified as the target fault branches. Among them, the return closure result is the result of whether the target power supply area has returned to the initial power supply state after the completion of the closed current transfer task; the task return result sequence is the ordered result of whether each closed current transfer task has completed the return closure. Health boundary management unit 4 is used to gradually reduce the transfer current amplitude of the back-loop unclosed task corresponding to the target fault branch and repeat the process. The transfer current amplitude that makes all closed transfer tasks close back-loop for the first time is determined as the health boundary current, and a health management result is generated. Among them, the health boundary current is the maximum verified transfer current of the target fault branch during the process of gradually reducing the transfer current to complete the return loop closure.

[0017] In this embodiment, the closed-loop transfer task generation unit 1 consists of tasks executed sequentially according to the initial power supply state, the alternative power supply state, and the return power supply state. Each closed-loop transfer task is configured with a closed-loop transfer task identifier and a task sequence number, and the task order is formed according to the task sequence number. The initial power supply state is the state in which the target load is powered by the initial power supply path and the distribution switch is in the initial distribution switch configuration. The alternative power supply state is the state in which the target load is powered by an alternative power supply path different from the initial power supply path and the distribution switch is in the alternative distribution switch configuration. The return power supply state is the state in which the distribution switch returns to the initial distribution switch configuration after the target load completes the alternative power supply. The determination of the transfer current amplitude includes: determining the available current carrying capacity of the alternative power supply path based on the branch rated current carrying capacity in the distribution network structure data and the current branch current in the distribution network operation data, and determining the transfer current amplitude corresponding to each closed-loop transfer task within the range not exceeding the target load operating current and the available current carrying capacity.

[0018] In this embodiment, the closed-loop transfer task generation unit acquires distribution network structure data and distribution network operation data. The distribution network structure data includes distribution node identifiers, distribution branch identifiers, connection relationships between distribution nodes and distribution branches, distribution switch identifiers, the branch where the distribution switch is located, the switch's on / off status, new energy grid-connected unit access nodes, energy storage unit access nodes, load access nodes, and the rated current carrying capacity of each distribution branch. The distribution network operation data includes the current branch current of each distribution branch, the node voltage of each distribution node, the operating current of each load, the output data of the new energy grid-connected unit, the output data of the energy storage unit, and the corresponding data acquisition time. The closed-loop transfer task generation unit associates the distribution network structure data and distribution network operation data according to the distribution node identifier, distribution branch identifier, and equipment identifier. It selects distribution network operation data within the same data acquisition period according to the data acquisition time, and writes the switch's on / off status into the corresponding distribution branch's on / off status field, forming distribution network topology data reflecting the current distribution network connection relationships and operation status; this is for testing. The load is used as the target load. Based on the access node of the target load, the power supply source is traced upstream along the current energized branch to determine the initial power supply path for transmitting power to the target load. Distribution branches connected to the initial power supply path and capable of forming a power supply path for the target load through the adjustment of the distribution switch status are included in the regional branch scope. The distribution nodes, distribution branches, distribution switches, new energy grid-connected units, energy storage units, and target loads within the regional branch scope are jointly determined as the target power supply area. The target power supply area corresponds to a target power supply area identifier. The target power supply area identifier is associated with the target load identifier, the distribution node identifier within the area, the distribution branch identifier within the area, the new energy grid-connected unit identifier, and the energy storage unit identifier, and the corresponding relationship is maintained within the same test cycle. The closed-loop transfer task generation unit performs consistency verification between the real-time opening and closing status of each distribution switch within the target power supply area and the switch status field in the distribution network topology data. Based on the verified distribution network topology data, the initial power supply path and the alternative power supply path that can maintain continuous power supply to the target load are determined.

[0019] In this embodiment, multiple closed-loop current transfer tasks are constructed for the same target power supply area. Each closed-loop current transfer task is set according to the execution order of the initial power supply state, the alternative power supply state, and the return power supply state, and is associated with and stored as a closed-loop current transfer task identifier, task number, target power supply area identifier, initial power supply path identifier, alternative power supply path identifier, initial distribution switch configuration, alternative distribution switch configuration, return distribution switch configuration, and transfer current amplitude. The closed-loop current transfer task identifier is used to uniquely identify the corresponding closed-loop current transfer task within the same test cycle. The closed-loop current transfer task identifier is generated by combining the target power supply area identifier, test cycle identifier, and task number according to a preset coding rule. The task number is used to indicate the arrangement position of the corresponding closed-loop current transfer task within the same test cycle. The closed-loop current transfer tasks are arranged in order from front to back according to the task number. The state execution order is used to limit the sequential relationship of the three power supply states within the same closed-loop current transfer task. The task order is used to limit the arrangement relationship between multiple closed-loop current transfer tasks, the position of each sequence in the branch current transfer participation sequence, and All subsequent generated task result data are associated with the corresponding task sequence number; the closed-loop transfer task generation unit determines the initial distribution switch configuration based on the initial power supply path, determines the alternative distribution switch configuration based on the alternative power supply path, and determines the initial distribution switch configuration as the return distribution switch configuration, so that the distribution switch configurations in the same closed-loop transfer task are arranged in the order of initial distribution switch configuration, alternative distribution switch configuration, and return distribution switch configuration; there is at least one distribution switch state difference between the alternative distribution switch configuration and the initial distribution switch configuration, so that the power supply path corresponding to the target load has different branch compositions under the two distribution switch configurations, and the return distribution switch configuration has the same combination of distribution switch open and closed states as the initial distribution switch configuration; the closed relationship in the closed-loop transfer task is reflected in the distribution switch configuration returning to the initial configuration after the initial configuration passes through the alternative configuration. The initial power supply state and the return power supply state correspond to the reference acquisition time point before the transfer starts and the verification acquisition time point after the power supply path return is completed, respectively, and are associated with the distribution network operation data at the corresponding acquisition time points.

[0020] In this embodiment, the initial power supply state is the power supply state formed when the target load receives power from the initial power supply path and all distribution switches in the target power supply area are in the initial distribution switch configuration at the start of the closed-loop transfer task. The initial power supply path is a set of energized branches continuously connected to the target load access node from the power supply access node in the target power supply area, determined according to the initial distribution switch configuration. The power supply includes the upstream power access node of the target power supply area and the new energy grid-connected unit and energy storage unit connected to the target power supply area. When forming the initial power supply state, the closed-loop transfer task generation unit associates the initial distribution switch configuration, the initial power supply path, the target load operating current, the current branch current of each branch of the initial power supply path, the control settings of the new energy grid-connected unit, and the output data of the energy storage unit with the corresponding closed-loop transfer task identifier to form the initial state record of the closed-loop transfer task. The alternative power supply state is the power supply state formed when the target load is powered by the alternative power supply path and all distribution switches in the target power supply area are in the alternative distribution switch configuration. The alternative power supply path is formed by adjusting the opening and closing states of the distribution switches and is consistent with the initial power supply path. The power path has at least one different distribution branch and is a set of energized branches that can be continuously connected from the power supply access node to the target load access node. The initial power supply path and the alternative power supply path can have a common distribution branch, and the corresponding current transfer relationship is formed by the change of the power supply participation relationship of at least one distribution branch. The return power supply state is when the target load completes the alternative power supply and each distribution switch in the target power supply area is restored to the power supply state formed when the return distribution switch configuration is set. The return distribution switch configuration corresponding to the return power supply state is the same as the initial distribution switch configuration. In the return power supply state, the distribution branch current, the target load terminal voltage, the output data of the new energy grid-connected unit, and the output data of the energy storage unit are collected again. When determining the alternative power supply path, the closed current transfer task generation unit sequentially verifies the branch connectivity relationship of the alternative power supply path, the executable state of the distribution switch, the continuous power supply condition of the target load, the operating state of the new energy grid-connected unit, the operating state of the energy storage unit, and the available current carrying capacity of the alternative power supply path, and writes the relationship between the initial power supply path, the alternative power supply path, and the return power supply path that meets the execution conditions of each task into the corresponding closed current transfer task.

[0021] In this embodiment, the closed-loop current transfer task generation unit determines the available current carrying capacity of the alternative power supply path based on the rated current carrying capacity and current current of each distribution branch in the alternative power supply path. Specifically, it reads the rated current carrying capacity corresponding to each distribution branch in the alternative power supply path from the distribution network structure data, and reads the current current of the same distribution branch at the time of closed-loop current transfer task generation from the distribution network operation data. The difference between the rated current carrying capacity and the current current of each distribution branch is determined as the remaining current carrying capacity of that distribution branch, and the unit then determines the available current carrying capacity according to the preset operation plan. The full margin is used to correct the remaining current-carrying capacity, resulting in the available additional current-carrying capacity for each distribution branch. For an alternative power supply path consisting of multiple consecutive distribution branches, the minimum available additional current-carrying capacity among all distribution branches is determined as the available current-carrying capacity of the alternative power supply path, ensuring that each distribution branch in the alternative power supply path has the capacity to accept the transfer of power supply current. The closed-loop transfer task generation unit reads the target load operating current at the time of closed-loop transfer task generation from the distribution network operation data, and compares the target load operating current with the available additional current-carrying capacity of the alternative power supply path. The smaller value among the current-carrying capacities is used to determine the upper limit of the transfer current, and the transfer current amplitude of the corresponding closed-loop transfer task is determined within the current range formed by the preset minimum test current and the upper limit of the transfer current. The preset minimum test current is preset according to the current acquisition accuracy of the target power supply area, the output adjustment accuracy of the energy storage unit, and the target load operating current level. The transfer current amplitude is associated with the corresponding closed-loop transfer task identifier and is used as the task-level current parameter when the target load power supply current is transferred from the initial power supply path to the alternative power supply path and from the alternative power supply path back to the initial power supply path in the closed-loop transfer task. Different closed-loop transfer tasks determine the transfer current amplitude according to the available current-carrying capacity of their respective alternative power supply paths and the target load operating current. After the closed-loop transfer task is generated and before the corresponding task is executed, the target load operating current, the current of the current branch of the alternative power supply path, and the status of the distribution switch are continuously verified. When the operating data changes beyond the preset update range, the three power supply states and transfer current amplitude of the corresponding closed-loop transfer task are re-determined based on the updated distribution network structure data and distribution network operating data.

[0022] In this embodiment, in the closed-loop transfer task generation unit 1, the candidate branch is a distribution branch within the target power supply area whose power participation state changes between the initial power supply state and the alternative power supply state of at least one closed-loop transfer task. The power participation state includes a participating state and a non-participating state. A candidate branch is determined to be in a participating state when it is located in the target load power supply path under the corresponding power supply state, and is determined to be in a non-participating state when it is not located in the power supply path. The generation of the branch transfer participation sequence corresponding to each candidate branch specifically includes: for each candidate branch, comparing the power participation state of the candidate branch under the initial power supply state and the alternative power supply state of each closed-loop transfer task, generating a change identifier when the power participation state changes, generating a hold identifier when the power participation state remains the same, arranging the change identifiers and hold identifiers according to the task order, generating the branch transfer participation sequence corresponding to the candidate branch, and making each sequence position correspond one-to-one with the task number of each closed-loop transfer task; the branch transfer participation sequences corresponding to each candidate branch are different from each other.

[0023] In this embodiment, the closed-loop transfer task generation unit determines a set of candidate branches based on the connection relationships between distribution nodes, distribution branches, distribution switches, and target loads within the target power supply area. For each closed-loop transfer task, the initial distribution switch configuration and the alternative distribution switch configuration are mapped to the distribution network topology data of the target power supply area, respectively. This yields the initial power supply path, where the power supply access node continuously connects to the target load access node under the initial power supply state, and the alternative power supply path, where the power supply access node continuously connects to the target load access node under the alternative power supply state. The power supply access nodes include upstream power supply access nodes, new energy grid-connected unit access nodes, and energy storage unit access nodes within the target power supply area. The distribution branches in the initial power supply path and the alternative power supply path are matched according to the distribution branch identifier. Distribution branches where the power supply participation relationship changes between the initial power supply path and the alternative power supply path of at least one closed-loop transfer task are identified as candidate branches. The candidate branches corresponding to closed-loop transfer tasks within the same target power supply area are then merged. A candidate branch set is formed. The power supply participation status includes participation status and non-participation status. For any candidate branch, the nodes at both ends of the candidate branch, the branch conduction status, and the distribution switch configuration under the corresponding power supply status are read. Path tracing is performed from the target load access node along the energized branch to the power supply access node. When the candidate branch is located in at least one energized power supply path that transmits power to the target load, the candidate branch is determined to be in the participation status under the corresponding power supply status. When the candidate branch is located outside the range of the energized power supply path, the candidate branch is determined to be in the non-participation status under the corresponding power supply status. The closed-loop transfer task identifier, task sequence number, power supply status identifier, candidate branch identifier, and power supply participation status are associated to form a power supply participation status record. For a power supply status with multiple parallel energized power supply paths, the candidate branch is determined to be in the participation status if it is located in any energized power supply path that transmits power to the target load. The closed-loop transfer task generation unit generates power supply participation status records for the candidate branch under the initial power supply status and the alternative power supply status, and matches the two records according to the closed-loop transfer task identifier.

[0024] In this embodiment, the closed-loop switching task generation unit compares the power participation status of the same candidate branch under the initial power supply state and the alternative power supply state in the same closed-loop switching task. A change flag is generated when the candidate branch changes from a participating state to a non-participating state or from a non-participating state to a participating state. A hold flag is generated when the candidate branch is in a participating state or in a non-participating state in both power supply states. The change flag or hold flag is then associated with the closed-loop switching task identifier, the task sequence number, and the candidate branch identifier. For each candidate branch, the change flag and hold flag corresponding to each task are read according to the task order of the closed-loop switching task, and written to the corresponding sequence positions from front to back according to the task sequence number, forming the branch switching participation sequence corresponding to that candidate branch. Each sequence position in the branch switching participation sequence corresponds to a closed-loop switching task. The number of sequence positions is the same as the number of closed-loop switching tasks in the same test period. The same sequence position corresponds to the same closed-loop switching task in the branch switching participation sequences of different candidate branches. The task generation unit performs a mutuality check on the branch current transfer participation sequences corresponding to each candidate branch. It compares the change flag and the hold flag in any two branch current transfer participation sequences bit by bit according to the task sequence number. When at least one of the same sequence positions has a different flag, it determines that the corresponding two branch current transfer participation sequences are different. When all sequence positions have the same flag, it selects an alternative power supply path from the executable alternative power supply paths in the target power supply area that can make the corresponding candidate branch form different power supply participation state changes, generates a supplementary closed current transfer task, and appends the change flag or hold flag corresponding to the supplementary closed current transfer task to each branch current transfer participation sequence until the branch current transfer participation sequences corresponding to each candidate branch are mutually different. Each branch current transfer participation sequence corresponding to each candidate branch includes at least one change flag. After the mutuality check is completed, the candidate branch flag, branch current transfer participation sequence, closed current transfer task flag corresponding to each sequence position, and power supply participation state record are associated and stored in the task dataset of the current test cycle.

[0025] In this embodiment, in the closed-loop power transfer execution unit 2, the new energy grid-connected unit is a new energy power supply device that connects to the target power supply area and outputs power to the distribution network according to the control settings; the energy storage unit is an energy storage device that connects to the target power supply area and participates in the power supply regulation of the target load by adjusting the charging and discharging output; the endpoint power supply constraint is a power supply constraint preset according to the rated voltage and continuous power supply requirements of the target load, including the target load end voltage constraint and the target load continuous power supply constraint; each closed-loop power transfer task is executed sequentially according to the task sequence, and the output of the energy storage unit is adjusted while keeping the control settings of the new energy grid-connected unit unchanged, so that the target power supply area sequentially enters the alternative power supply state and the return power supply state.

[0026] In this embodiment, the closed-loop current transfer execution unit reads each closed-loop current transfer task from the task dataset corresponding to the current test cycle, and forms a task order from front to back according to the task sequence number of each closed-loop current transfer task. The task order is used to limit the execution order of multiple closed-loop current transfer tasks within the same target power supply area. Within a single closed-loop current transfer task, processing is performed according to the state execution order of initial power supply state, alternative power supply state, and return power supply state. The closed-loop current transfer execution unit reads the target power supply area identifier, initial distribution switch configuration, alternative distribution switch configuration, return distribution switch configuration, initial power supply path, alternative power supply path, and transfer current amplitude according to the closed-loop current transfer task identifier corresponding to the current task, and collects the current open / closed state of each distribution switch within the target power supply area, the target load terminal voltage, the target load operating current, the output data of the new energy grid-connected unit, and the output data of the energy storage unit. When the current open / closed state of each distribution switch is consistent with the initial power supply state, the unit performs the corresponding tasks. With consistent initial distribution switch configurations, and the target load voltage and target load operating current meeting endpoint power supply constraints, when the new energy grid-connected unit and energy storage unit are in task execution mode, the target power supply area is determined as the initial power supply state of the current closed-loop transfer task. After the closed-loop transfer execution unit completes the processing of the alternative power supply state and return power supply state corresponding to the current task and returns the data acquisition, it reads the next closed-loop transfer task according to the next task sequence number and reconfirms the corresponding initial distribution switch configuration and initial power supply state, so that each closed-loop transfer task has an independent task execution record and initial operating benchmark. The task execution record includes the closed-loop transfer task identifier, task sequence number, formation time of each power supply state, distribution switch status feedback, target load voltage, target load operating current, output data of the new energy grid-connected unit, and output data of the energy storage unit. Each record establishes a correspondence between the closed-loop transfer task identifier and the current task.

[0027] In this embodiment, the new energy grid-connected unit is a new energy power supply device that connects to the target power supply area through a new energy access node and outputs electrical energy to the distribution network. It includes new energy power generation equipment, a grid-connected converter, and a grid-connected control device. The new energy power generation equipment includes photovoltaic power generation equipment and wind power generation equipment. The grid-connected control device controls the grid-connected converter according to a pre-configured grid-connected control mode, active power control command, and reactive power control command. The closed-loop current transfer execution unit reads the grid-connected control mode, active power control command, and reactive power control command of the new energy grid-connected unit at the start of each closed-loop current transfer task, and determines the reading result as the control setting corresponding to the current task. The control setting remains consistent with the task start state between the initial power supply state, the alternative power supply state, and the return power supply state. Simultaneously, it records the actual active power, actual reactive power, and grid-connected current of the new energy grid-connected unit according to the data acquisition cycle. To maintain consistency, the same new energy grid connection control conditions are used for each power supply state of the same closed-loop current transfer task. The actual output changes caused by changes in new energy resources are recorded through the output data of the new energy grid connection unit. The energy storage unit is an energy storage device that is connected to the target power supply area through the energy storage access node and participates in the power supply regulation of the target load. It includes energy storage equipment, energy storage converter and energy storage control device. The energy storage control device controls the charging output and discharging output of the energy storage converter according to the output regulation command issued by the closed-loop current transfer execution unit. Before the task starts, the closed-loop current transfer execution unit reads the state of charge, current active power, current reactive power, allowable charging power and allowable discharging power of the energy storage unit, and forms the energy storage output regulation command according to the target load voltage and the target load operating current. The active power of the energy storage unit is used to compensate for the change in the power supply of the target load, and the reactive power of the energy storage unit is used to cooperate in regulating the voltage of the target load.

[0028] In this embodiment, the endpoint power supply constraint refers to the power supply operation conditions pre-set for the target load access node, including the target load end voltage constraint and the target load continuous power supply constraint. The target load end voltage constraint includes a lower limit and an upper limit of the end voltage determined based on the rated voltage of the target load. The target load continuous power supply constraint includes a lower limit of the power supply current and a continuous power supply holding period determined based on the target load operation requirements. The closed-loop current transfer execution unit reads the target load end voltage from the voltage measuring device corresponding to the target load access node and reads the target load power supply current from the current measuring device corresponding to the target load power supply circuit. When the target load end voltage is between the lower limit and the upper limit of the end voltage, and the target load power supply current reaches the lower limit of the power supply current during the continuous power supply holding period, it is determined that the target load meets the endpoint power supply constraint. When executing the current closed-loop current transfer task, the closed-loop current transfer execution unit performs the operation according to the initial distribution switch configuration and replacement... The difference in switch states between the alternative distribution switch configurations generates a replacement switch action command, which is then sent to the corresponding distribution switch. Simultaneously, the energy storage unit output is adjusted based on the target load voltage and target load supply current. When the distribution switch status feedback matches the alternative distribution switch configuration, the target load obtains power from the alternative power supply path, and the endpoint power supply constraints are continuously met, the target power supply area is determined to enter the alternative power supply state. After completing the alternative power supply state processing, the closed-loop current transfer execution unit generates a return switch action command based on the difference in switch states between the alternative and return distribution switch configurations, and sends the return switch action command to the corresponding distribution switch. Simultaneously, the energy storage unit output continues to be adjusted. When the distribution switch status feedback matches the return distribution switch configuration, the target load obtains power from the initial power supply path, and the endpoint power supply constraints are continuously met, the target power supply area is determined to enter the return power supply state.

[0029] In this embodiment, the closed-loop transfer execution unit 2 performs forward and reverse transfers with the same transfer current amplitude. Specifically, this includes: for the same closed-loop transfer task, configuring a replacement power distribution switch and adjusting the energy storage unit output to transfer the power supply current corresponding to the target load from the initial power supply path to the replacement power supply path, and ensuring that the amplitude of the transferred power supply current reaches the transfer current amplitude corresponding to the closed-loop transfer task; after the target power supply area enters the replacement power supply state, configuring a return power distribution switch and adjusting the energy storage unit output to return the power supply current of the same amplitude from the replacement power supply path to the initial power supply path; and in the execution of the closed-loop transfer task... Before the power transfer task, the initial energy storage output of the energy storage unit is obtained when it meets the endpoint power supply constraints in the initial power supply state, and the initial energy storage output is determined as the initial compensation state. After entering the return power supply state, the energy storage return output formed by the energy storage unit to meet the endpoint power supply constraints is obtained during the return verification period. A compensation deviation value is generated based on the difference between the energy storage return output and the energy storage initial output. The closed power transfer task identifier, the energy storage initial output, the energy storage return output, and the compensation deviation value are associated to generate return compensation deviation data. The return verification period is a preset data acquisition period after the target power supply area enters the return power supply state.

[0030] In this embodiment, the closed-loop current transfer execution unit uses the transfer current amplitude configured for the same closed-loop current transfer task as the common target value for both forward and reverse current transfer. Forward and reverse current transfer have opposite current transfer directions and use the same target transfer current value and current tracking allowable range. When performing forward current transfer, the closed-loop current transfer execution unit records the reference branch current at the corresponding measurement positions of the initial power supply path and the alternative power supply path under the initial power supply state. Based on the difference in switch states between the initial and alternative power distribution switch configurations, it controls the corresponding power distribution switch operation and adjusts the energy storage unit output to transfer the current corresponding to the target load from the initial power supply path to the alternative power supply path. The closed-loop current transfer execution unit collects the branch current at the preset path measurement position of the alternative power supply path and calculates the increase in the branch current of the alternative power supply path relative to the corresponding reference branch current. The quantity is determined as the actual forward transfer current. When the actual forward transfer current enters the current tracking allowable range based on the transfer current amplitude configured for the task, and the status feedback of the distribution switch is consistent with the configuration of the alternative distribution switch and the endpoint power supply constraint is continuously met, the forward transfer is determined to be completed. When performing reverse transfer, the closed transfer execution unit controls the distribution switch to switch from the configuration of the alternative distribution switch to the configuration of the return distribution switch, and adjusts the output of the energy storage unit so that the power supply current corresponding to the target load returns from the alternative power supply path to the initial power supply path. The branch current is collected at the preset path measurement position of the initial power supply path, and the increase in the power supply current re-borne by the initial power supply path is determined as the actual reverse transfer current. When the actual reverse transfer current enters the same current tracking allowable range, and the status feedback of the distribution switch is consistent with the configuration of the return distribution switch and the endpoint power supply constraint is continuously met, the reverse transfer is determined to be completed.

[0031] In this embodiment, before executing each closed-loop current transfer task, the closed-loop current transfer execution unit confirms that the target power supply area is in the initial distribution switch configuration, maintains the control settings of the new energy grid-connected unit consistent with those at the start of the current task, and sets an initial stable acquisition period under the condition that the target load meets the endpoint power supply constraints. During the initial stable acquisition period, the active power and reactive power of the energy storage unit are continuously collected according to a preset sampling frequency. The active power of the energy storage unit during the initial stable acquisition period is averaged, and the resulting average value is determined as the initial output of the energy storage. The initial output of the energy storage is associated with the closed-loop current transfer task identifier, task sequence number, target power supply area identifier, initial stable acquisition period, and new energy grid-connected unit control setting identifier to form an initial compensation status record. The reverse current transfer is completed and the target power supply area is confirmed to be in the process of entering the target power supply area. After returning to power supply status, the closed-loop current transfer execution unit sets a stable waiting period. After the stable waiting period ends, it enters the return verification period. The return verification period uses the same data sampling frequency and sampling duration as the initial stable acquisition period. The active power and reactive power formed by the energy storage unit to meet the endpoint power supply constraints are continuously collected according to the sampling frequency. The active power of the energy storage unit during the return verification period is averaged, and the average value is determined as the energy storage return output. The stable waiting period is preset according to the action response time of the distribution switch, the output adjustment response time of the energy storage unit, and the data acquisition cycle of the distribution network operation. The initial stable acquisition period and the return verification period use the same physical quantities, measurement units, sampling methods, and statistical methods to ensure that the initial energy storage output and the energy storage return output have corresponding data acquisition calibers.

[0032] In this embodiment, the closed-loop current transfer execution unit records the active power of the energy storage unit supplying power to the target load as the positive output and the active power of the energy storage unit absorbing power from the target power supply area as the reverse output. The compensation deviation value is obtained by subtracting the initial energy storage output from the energy storage return output. The compensation deviation value retains the corresponding output direction, where a positive value corresponds to the increase in active power of the energy storage unit in the return power supply state compared to the initial power supply state, and a negative value corresponds to the decrease in active power of the energy storage unit in the return power supply state compared to the initial power supply state. The closed-loop current transfer execution unit records the closed-loop current transfer task identifier, task sequence number, target power supply area identifier, initial energy storage output, energy storage return output, compensation deviation value, initial stable acquisition period, return verification period, data acquisition time, and... The control setting identifier of the new energy grid-connected unit is associated with the generation of return compensation deviation data, and the actual transfer current of forward current conversion, the actual transfer current of reverse current conversion, the transfer current amplitude, and the corresponding current tracking allowable range are written into the return compensation deviation data. The return compensation deviation data corresponds one-to-one with the current closed current conversion task. The closed current conversion task identifier is used to maintain the association between the task and the data record, the task sequence number is used to maintain the correspondence between each return compensation deviation data and the task sequence, the initial energy storage output and the return energy storage output are used to record the energy storage output status of two acquisition periods under the same control setting and the same endpoint power supply constraint, and the compensation deviation value is used to record the energy storage compensation change formed to maintain the initial power supply state after the target power supply area completes the equal amplitude forward current conversion and reverse current conversion.

[0033] In this embodiment, the allowable range of compensation deviation in the return verification fault location unit 3 is the allowable variation range of compensation deviation corresponding to the target power supply area, including a lower limit and an upper limit, used to verify whether the compensation deviation in the return power supply state meets the return closure condition; the allowable range of compensation deviation is determined based on the return compensation deviation data obtained by performing a closed current transfer task in the target power supply area under normal operating conditions, and each closed current transfer task corresponding to the same target power supply area adopts the same allowable range of compensation deviation; the return closure result includes return closure and return non-closure, used to characterize the closed current transfer task entering the return power supply state. Whether the initial power supply state is restored after the state is changed; the return closure result of each closed current transfer task is determined based on the returned compensation deviation data and the allowable range of compensation deviation. Specifically, this includes: reading the compensation deviation value from each returned compensation deviation data, comparing the compensation deviation value with the allowable range of compensation deviation for the corresponding target power supply area, and determining the return closure result of the corresponding closed current transfer task as a return closure when the compensation deviation value is within the allowable range of compensation deviation, and determining the return closure result of the corresponding closed current transfer task as a return non-closure when the compensation deviation value is not within the allowable range of compensation deviation, and associating the return closure result with the corresponding closed current transfer task identifier.

[0034] In this embodiment, the back-trip verification fault location unit establishes a compensation deviation benchmark dataset for each target power supply area. This dataset originates from the return compensation deviation data generated by executing multiple test cycles of closed-loop transfer tasks when the target power supply area is in normal operating condition. Normal operating condition corresponds to a power supply state where each distribution branch within the target power supply area is in its approved operating condition, the actual opening and closing status of each distribution switch is consistent with the distribution network topology data, the target load voltage and target load operating current meet the endpoint power supply constraints, and the new energy grid-connected unit and energy storage unit are in an allowable operating state. Under normal operating condition, the closed-loop transfer execution unit completes forward and reverse transfer according to the transfer current amplitude configured for each closed-loop transfer task, forming a return distribution switch configuration. It also obtains the initial energy storage output and energy storage return output during the initial stable acquisition period and the return verification period, respectively. The back-trip verification fault location unit then obtains the corresponding return compensation data. The compensation deviation value is read from the deviation data, and the compensation deviation values ​​obtained in multiple test cycles are aggregated into the same compensation deviation benchmark dataset according to the target power supply area identifier. Each benchmark data is associated with the closed-loop transfer task identifier, task sequence number, test cycle identifier, initial energy storage output, energy storage return output, compensation deviation value, new energy grid-connected unit control setting identifier, and data acquisition time, and adopts the same physical type, positive and negative direction, unit of measurement, and statistical method of compensation quantity as the current test cycle. The return verification fault location unit selects the valid benchmark data corresponding to the target power supply area according to the preset benchmark update cycle, and aggregates the compensation deviation values ​​of normal power supply conditions belonging to the same target power supply area based on the target load operating range, new energy grid-connected unit output range, and energy storage unit operating range recorded by each benchmark data, forming regional-level compensation deviation benchmark data to characterize the degree of normal change in energy storage compensation after the power supply path has completed transfer and return.

[0035] In this embodiment, the allowable range of compensation deviation is the allowable variation range of compensation deviation corresponding to the target power supply area, including a lower limit and an upper limit. The lower limit is used to define the negative variation boundary of the energy storage return output relative to the initial energy storage output, and the upper limit is used to define the positive variation boundary of the energy storage return output relative to the initial energy storage output. The backhaul verification fault location unit reads each compensation deviation value from the compensation deviation benchmark dataset, takes the minimum compensation deviation value as the negative benchmark boundary, takes the maximum compensation deviation value as the positive benchmark boundary, and sets negative and positive allowable margins according to the current measurement accuracy, energy storage unit output adjustment accuracy, actual output variation range of the new energy grid-connected unit, and target load operating current fluctuation range, respectively. The negative benchmark boundary is expanded according to the negative allowable margin to determine the lower limit of the allowable range, and the positive benchmark boundary is expanded according to the positive allowable margin. After the quantity is expanded, it is determined as the upper limit of the allowable range; the allowable range of compensation deviation is associated with the target power supply area identifier, the reference data version identifier, the effective test cycle identifier, the lower limit of the allowable range, the upper limit of the allowable range, and the unit of measurement of the compensation amount. Each closed-loop transfer task corresponding to the same target power supply area calls the allowable range of compensation deviation corresponding to the target power supply area, and each returned compensation deviation data continues to maintain task-level association according to the closed-loop transfer task identifier; at the beginning of a test cycle, the return verification fault location unit reads the currently effective allowable range of compensation deviation according to the target power supply area identifier, and keeps the lower limit and upper limit of the allowable range fixed during the test cycle. It re-collects the compensation deviation value under normal operating conditions according to the preset reference update cycle and forms an updated compensation deviation reference dataset. The allowable range of compensation deviation determined according to the updated compensation deviation reference dataset is associated with subsequent test cycles.

[0036] In this embodiment, the return loop closure result includes return loop closure and return loop non-closure. Return loop closure is used to characterize the task state where the closed current transfer task completes forward and reverse current transfer, forms a return distribution switch configuration, and the compensation deviation value is within the allowable compensation deviation range corresponding to the target power supply area. Return loop non-closure is used to characterize the task state where the compensation deviation value is lower than the lower limit of the allowable range or higher than the upper limit of the allowable range after the closed current transfer task forms the return distribution switch configuration. The return loop verification fault location unit reads each return compensation deviation data according to the closed current transfer task identifier, reads the target power supply area identifier, task number, initial energy storage output, energy storage return output, and compensation deviation value from the return compensation deviation data, calls the corresponding allowable compensation deviation range according to the target power supply area identifier, and respectively compensates... The compensation deviation value is compared with the lower limit and upper limit of the allowable range. When the compensation deviation value is greater than or equal to the lower limit of the allowable range and less than or equal to the upper limit of the allowable range, the return closure result of the corresponding closed-loop transfer task is determined as a return closure. When the compensation deviation value is lower than the lower limit of the allowable range or higher than the upper limit of the allowable range, the return closure result of the corresponding closed-loop transfer task is determined as a return failure. The return verification fault location unit associates the closed-loop transfer task identifier, task sequence number, target power supply area identifier, compensation deviation value, lower limit of the allowable range, upper limit of the allowable range, return closure result, and result generation time to form a return verification record. According to the test cycle identifier, the return verification records corresponding to each closed-loop transfer task in the same test cycle are collected into the current task return result dataset.

[0037] In this embodiment, in the backhaul verification fault location unit 3, the task backhaul result sequence is a sequence formed by arranging the change identifiers and hold identifiers corresponding to each closed-loop switching task according to the task order, used to perform position-by-position verification with the branch switching participation sequence corresponding to each candidate branch; generating the task backhaul result sequence specifically includes: generating a change identifier when the backhaul closure result of the closed-loop switching task is a backhaul not closed, generating a hold identifier when the backhaul closure result of the closed-loop switching task is a backhaul closed, arranging the generated change identifiers and hold identifiers according to the task sequence number of each closed-loop switching task to obtain the task backhaul result sequence; each sequence position of the task backhaul result sequence corresponds to a closed-loop switching task, the task backhaul result sequence and each branch switching participation sequence have the same sequence length, and the same sequence position of the task backhaul result sequence and the branch switching participation sequence correspond to the same closed-loop switching task.

[0038] In this embodiment, the return-trip verification fault location unit uses the same change identifier and hold identifier as the branch current transfer participation sequence to encode the return-trip closure result of each closed current transfer task. Specifically, the return-trip closure result of a closed current transfer task generates a change identifier when the return trip is not closed. This change identifier records an out-of-range change in the energy storage compensation state relative to the normal allowable state after the corresponding closed current transfer task completes the power supply path transfer and return. The return-trip closure result of a closed current transfer task generates a hold identifier when the return trip is closed. This hold identifier records that the energy storage compensation state remains within the normal allowable range after the corresponding closed current transfer task completes the power supply path transfer and return. The change identifier and hold identifier adopt the identifier encoding rules set during the closed current transfer task generation stage. The change identifier uses the same encoding value, data type, and storage format in both the task return-trip result sequence and the branch current transfer participation sequence. The hold identifier... The task return result sequence and the branch current transfer participation sequence use the same encoding value, data type and storage format. For each closed current transfer task in the current test cycle, the return verification fault location unit reads the closed current transfer task identifier, task sequence number and return closure result from the corresponding return verification record. Based on the return closure result, it generates a change identifier or a maintain identifier and associates the generated identifier with the closed current transfer task identifier, task sequence number, target power supply area identifier, test cycle identifier and compensation deviation value to form a task return identifier record. The change identifier in the branch current transfer participation sequence comes from the change in power supply participation state of the candidate branch between the initial power supply state and the alternative power supply state. The change identifier in the task return result sequence comes from the return unclosed result formed by the corresponding closed current transfer task. The two types of change identifiers establish a sequence position association according to the same closed current transfer task and the same task sequence number.

[0039] In this embodiment, the task return result sequence is an ordered sequence of identifiers formed by arranging the change identifiers and hold identifiers corresponding to each closed-loop current transfer task in the task order. The return verification fault location unit reads all task return identifier records corresponding to the current target power supply area and the current test cycle, determines the sequence position of each task return identifier record in ascending order of task sequence number, and writes the change identifier or hold identifier in each task return identifier record into the corresponding sequence position to generate a task return result sequence corresponding to the current target power supply area and the current test cycle. The number of sequence positions in the task return result sequence is consistent with the number of closed-loop current transfer tasks in the current test cycle. Each sequence position corresponds to a closed-loop current transfer task identifier and a task sequence number, and each candidate branch corresponds to... The branch current transfer participation sequence adopts the same task order, sequence position quantity, and task sequence number correspondence. When forming the task return result sequence, the return verification fault location unit checks the closed current transfer task identifier and task sequence number corresponding to each sequence position in turn, and associates the target power supply area identifier, test cycle identifier, sequence length, task sequence version identifier, and the identifier value corresponding to each sequence position into the sequence data. The first sequence position in the task return result sequence and the branch current transfer participation sequence jointly correspond to the closed current transfer task with the smallest task sequence number. Subsequent sequence positions correspond to the same closed current transfer task in turn according to the task sequence number, so that the return abnormal distribution position in the task return result sequence and the power supply participation status change position of each candidate branch in the closed current transfer task set adopt the same position reference.

[0040] In this embodiment, in the backhaul verification fault location unit 3, the target fault branch is a candidate branch whose branch transfer participation sequence matches the task backhaul result sequence position by position. The task backhaul result sequence is checked position by position with each branch transfer participation sequence, and the candidate branches with the same sequence are determined as the target fault branches. Specifically, this includes: selecting the same sequence positions in the task backhaul result sequence and each branch transfer participation sequence in the task order, comparing the change flag and the hold flag in the same sequence positions, and when all sequence positions of the branch transfer participation sequence corresponding to a candidate branch have the same flag, the candidate branch is determined as a matching candidate branch; based on the fact that the branch transfer participation sequences corresponding to each candidate branch are different, the unique matching candidate branch is determined as the target fault branch.

[0041] In this embodiment, the backhaul verification fault location unit verifies the task backhaul result sequence corresponding to the current target power supply area against the branch current transfer participation sequence corresponding to each candidate branch, position by position. First, it reads the target power supply area identifier, test cycle identifier, task sequence version identifier, and sequence length associated with the task backhaul result sequence. Then, it reads the target power supply area identifier, test cycle identifier, task sequence version identifier, sequence length, and candidate branch identifier associated with the branch current transfer participation sequence to be verified. When the two types of sequences correspond to the same target power supply area, the same test cycle, the same task sequence version, and the same sequence length, the unit selects the same sequence position in both types of sequences according to the task sequence number. For each same sequence position, the backhaul verification fault location unit reads the change identifier or maintain identifier in the task backhaul result sequence and reads the corresponding position in the branch current transfer participation sequence. The change identifier or the retention identifier is used to record the sequence position as a position match when two identifiers have the same coded value. The task sequence number, closed-loop transfer task identifier, task return identifier, branch participation identifier, and position matching result are associated to form a position verification record. When the branch transfer participation sequence corresponding to a candidate branch and the task return result sequence form a position match in all sequence positions, the candidate branch is determined as a matching candidate branch. The candidate branch identifier, the corresponding branch transfer participation sequence, the task return result sequence, and all position verification records are associated to form a sequence matching record. The change identifier position in the task return result sequence corresponds to a closed-loop transfer task that forms a return unclosed result. The change identifier position in the branch transfer participation sequence corresponds to a closed-loop transfer task in which the candidate branch changes its power participation state between the initial power supply state and the alternative power supply state.

[0042] In this embodiment, the branch flow participation sequences corresponding to each candidate branch undergo mutual exclusion verification during the closed flow task generation stage. Any two branch flow participation sequences have different change or maintenance identifiers at least at one common sequence position, ensuring that each candidate branch corresponds to a unique branch flow participation sequence in the current closed flow task set. After the return verification fault location unit completes the position-by-position verification of the task return result sequence and all branch flow participation sequences, it reads matching candidate branches from each sequence matching record where all sequence positions form position matches. Based on the mutual exclusion relationship between each branch flow participation sequence, the matching candidate branch is determined as the unique matching candidate branch. The distribution branch corresponding to the unique matching candidate branch is identified as the target fault branch. The return verification fault location unit reads the distribution branch identifier, branch current transfer participation sequence, task return result sequence, and closed current transfer task identifier corresponding to each changed identifier position of the target fault branch. It also reads the compensation deviation value, lower limit of allowable range, upper limit of allowable range, and return closure result from the corresponding return verification record. The target power supply area identifier, test cycle identifier, distribution branch identifier corresponding to the target fault branch, branch current transfer participation sequence, task return result sequence, closed current transfer task identifier corresponding to the unclosed return task, compensation deviation value, and fault location time are associated to generate the fault location result.

[0043] In this embodiment, in the health boundary management unit 4, the back-loop unclosed task is a closed current transfer task in the branch current transfer participation sequence corresponding to the target fault branch, where the sequence position of the identifier is changed and the back-loop closure result is a back-loop unclosed task. Determining the health boundary current specifically includes: reading the transfer current amplitude currently configured for each back-loop unclosed task, determining the minimum value among them as the starting test current, generating a current level sequence with progressively decreasing current values ​​based on the starting test current, setting the transfer current amplitude of each back-loop unclosed task to the current test current according to the current level sequence, and repeatedly executing each back-loop unclosed task; when each back-loop unclosed task first forms a back-loop closure result, determining the corresponding current test current as the health boundary current; reading the current operating current of the target fault branch from the distribution network operation data, generating the branch health margin based on the difference between the health boundary current and the current operating current, and associating the target fault branch identifier, health boundary current, and branch health margin to generate a health management result.

[0044] In this embodiment, the health boundary management unit reads the distribution branch identifier, branch current transfer participation sequence, task return result sequence, and closed current transfer task identifier associated with each sequence position from the fault location results. It then matches the branch current transfer participation sequence corresponding to the target fault branch with the return closure result of each closed current transfer task according to the task sequence number. When a sequence position is recorded as a change identifier in the branch current transfer participation sequence corresponding to the target fault branch, and the return closure result of the closed current transfer task corresponding to that sequence position is a non-closed return, the closed current transfer task is identified as a non-closed return task corresponding to the target fault branch. The closed current transfer task identifier, task sequence number, initial power supply path, alternative power supply path, initial distribution switch configuration, alternative distribution switch configuration, return distribution switch configuration, currently configured transfer current amplitude, return compensation deviation data, and return closure result are associated to form a boundary test task record. The health boundary management unit reads each non-closed return task. The minimum value among the currently configured transfer current amplitudes is determined as the starting test current, ensuring that all backhaul unclosed tasks participating in the health boundary test adopt a uniform initial test current level. A current level sequence is generated based on the starting test current and the preset current reduction. The current level sequence includes multiple test currents arranged in descending order of current value. The difference between two adjacent test currents is equal to the preset current reduction. The first test current in the current level sequence is the starting test current, and the last test current is greater than or equal to the preset minimum boundary test current. The preset current reduction is set according to the rated current carrying capacity of the target fault branch, the current measurement accuracy, the energy storage unit output regulation accuracy, and the target load operating current level. The preset minimum boundary test current is set according to the minimum power supply current transfer scale required to form an effective current transfer response in the target power supply area. The current level sequence is then associated and stored with the distribution branch identifier, test cycle identifier, and backhaul unclosed task identifier corresponding to the target fault branch.

[0045] In this embodiment, the health boundary management unit performs boundary tests sequentially from the first test current to the last test current according to the current level sequence. At each current level, the transfer current amplitude originally configured for each loop unclosed task is set as the current test current, and the determination method of the initial power supply state, alternative power supply state, return power supply state, task sequence, new energy grid-connected unit control settings, and endpoint power supply constraints corresponding to each task is consistent with the fault location test cycle. For the current test current, the health boundary management unit sequentially calls the corresponding task according to the task sequence number of each loop unclosed task, so that the target load power supply current completes the forward transfer from the initial power supply path to the alternative power supply path and the reverse transfer from the alternative power supply path to the initial power supply path according to the current test current. After each task enters the return power supply state, the initial output and return output of the energy storage are collected to generate the compensation deviation value corresponding to the current test current. The compensation deviation value is compared with the allowable compensation deviation range corresponding to the target power supply area to determine the loop closure result of each loop unclosed task under the current test current, and the current... The current level verification record is formed by associating the previous test current, closed transfer task identifier, task sequence number, initial energy storage output, energy storage return output, compensation deviation value, and return closure result. After verifying all return non-closed tasks under the current test current, the return closure result corresponding to each task is counted. When all return non-closed tasks have formed return closure results, the current test current is determined as the first closure current, and the boundary test corresponding to the subsequent lower current level is terminated. When there is a return non-closed result under the current test current, the next test current is read according to the current level sequence and each return non-closed task is repeated. Since the current level sequence is arranged from largest to smallest current value, the current test current that first makes all return non-closed tasks form return closure results is the maximum verified transfer current for the target fault branch to complete the power supply current transfer and return. The health boundary management unit determines the first closure current as the health boundary current of the target fault branch and associates the health boundary current, the corresponding current level, the current level verification record of each return non-closed task, and the boundary determination time to form a health boundary record.

[0046] In this embodiment, the health boundary management unit reads the current operating current of the target fault branch at the time of health boundary determination from the distribution network operation data. The current operating current is the effective value of the branch current actually carried by the target fault branch under the current distribution switch configuration and target load operation state. The current operating current is associated with the distribution branch identifier, data acquisition time, and distribution network operation state identifier. A branch health margin is generated based on the difference between the health boundary current and the current operating current. The branch health margin is used to represent the remaining current space between the current actual current carried by the target fault branch and the maximum verified transfer current. When the health boundary current is greater than the current operating current, the corresponding difference represents the available transfer current of the target fault branch under the current operating conditions. When the current margin and health boundary current are equal to the current operating current, the corresponding difference indicates that the target fault branch is at the verified health boundary position. When the health boundary current is less than the current operating current, the corresponding difference indicates that the current carrying current of the target fault branch exceeds the current level of the verified health boundary. The health boundary management unit associates the target power supply area identifier, test cycle identifier, distribution branch identifier corresponding to the target fault branch, current operating current of the target fault branch, health boundary current, branch health margin, back loop unclosed task identifier, current level sequence, verification records of each current level, and the generation time of health management results to form health management results. The health management results are then written into the distribution network branch health management dataset according to the distribution branch identifier corresponding to the target fault branch.

[0047] Example 2: This invention proposes a method for fault prediction and health management of a new energy distribution network, used in the fault prediction and health management system of a new energy distribution network in Example 1 above, comprising the following steps: S1. Obtain distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed current transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch current transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. S2. Execute each closed-loop transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward and reverse transfer according to the same transfer current amplitude. Generate return compensation deviation data in the return power supply state. S3. Determine the return closure result of each closed-loop transfer task based on the returned compensation deviation data and the allowable range of compensation deviation, and generate the task return result sequence according to the task order. Verify the task return result sequence with the transfer participation sequence of each branch one by one, and determine the candidate branches with the same sequence as the target fault branches. S4. For the back-loop unclosed task corresponding to the target fault branch, gradually reduce the transfer current amplitude and repeat the process. The transfer current amplitude that makes all closed transfer tasks close back-loop for the first time is determined as the health boundary current, and health management results are generated.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A fault prediction and health management system for a new energy distribution network, characterized in that, include: The closed-loop transfer task generation unit (1) is used to acquire distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed-loop transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. Among them, the closed-loop current transfer task is used to detect whether the candidate branch can restore the initial power supply state after the power supply current is transferred and returned; the power supply participation status indicates whether the candidate branch participates in the power supply of the target load; the branch current transfer participation sequence is a power supply participation status identifier sequence formed according to the order of the closed-loop current transfer task; the transfer current amplitude is the current value of the scale of power supply current transfer in the closed-loop current transfer task; Closed-loop current transfer execution unit (2) is used to execute each closed-loop current transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward current transfer and reverse current transfer according to the same transfer current amplitude, and generate return compensation deviation data in the return power supply state; Among them, forward current transfer is the process of transferring the power supply current corresponding to the target load from the initial power supply path to the alternative power supply path; reverse current transfer is the process of transferring the power supply current from the alternative power supply path back to the initial power supply path; return compensation deviation data is the data on the deviation of the compensation amount required to maintain the initial power supply state after the reverse current transfer is completed from the initial compensation state. The return verification fault location unit (3) is used to determine the return closure result of each closed transfer task based on the return compensation deviation data and the allowable range of compensation deviation, and generate the task return result sequence according to the task order. The task return result sequence is checked against the transfer participation sequence of each branch, and the candidate branches with the same sequence are identified as the target fault branches. Among them, the return closure result is the result of whether the target power supply area has returned to the initial power supply state after the completion of the closed current transfer task; the task return result sequence is the ordered result of whether each closed current transfer task has completed the return closure. The health boundary management unit (4) is used to reduce the transfer current amplitude of the back-loop unclosed task corresponding to the target fault branch step by step and repeat the execution. The transfer current amplitude that makes all closed transfer tasks close back-loop for the first time is determined as the health boundary current, and the health management result is generated. Among them, the health boundary current is the maximum verified transfer current of the target fault branch during the process of gradually reducing the transfer current to complete the return loop closure.

2. The new energy distribution network fault prediction and health management system according to claim 1, characterized in that, In the closed-loop transfer task generation unit (1), the closed-loop transfer task is a task executed sequentially according to the initial power supply state, the alternative power supply state, and the return power supply state. Each closed-loop transfer task is configured with a closed-loop transfer task identifier and a task sequence number, and the task sequence is formed according to the task sequence number. The initial power supply state is the state in which the target load is powered by the initial power supply path and the distribution switch is in the initial distribution switch configuration. The alternative power supply state is the state in which the target load is powered by an alternative power supply path different from the initial power supply path and the distribution switch is in the alternative distribution switch configuration. The return power supply state is the state in which the distribution switch returns to the initial distribution switch configuration after the target load completes the alternative power supply. The determination of the transfer current amplitude includes: determining the available current carrying capacity of the alternative power supply path according to the branch rated current carrying capacity in the distribution network structure data and the current branch current in the distribution network operation data, and determining the transfer current amplitude corresponding to each closed-loop transfer task within the range not exceeding the target load operating current and the available current carrying capacity.

3. The new energy distribution network fault prediction and health management system according to claim 2, characterized in that, In the closed-loop transfer task generation unit (1), the candidate branch is the distribution branch in the target power supply area that changes its power supply participation state between the initial power supply state and the alternative power supply state of at least one closed-loop transfer task; the power supply participation state includes participation state and non-participation state. When the candidate branch is located in the target load power supply path under the corresponding power supply state, it is determined to be in the participation state; when the candidate branch is not located in the power supply path, it is determined to be in the non-participation state. The process of generating the branch switching participation sequence for each candidate branch includes: for each candidate branch, comparing the power supply participation status of the candidate branch under the initial power supply state and the alternative power supply state in each closed switching task; generating a change flag when the power supply participation status changes; generating a hold flag when the power supply participation status remains the same; arranging the change flags and hold flags according to the task order to generate the branch switching participation sequence for the candidate branch; and ensuring that the position of each sequence corresponds one-to-one with the task number of each closed switching task; the branch switching participation sequences for each candidate branch are distinct.

4. The new energy distribution network fault prediction and health management system according to claim 3, characterized in that, In the closed-loop power transfer execution unit (2), the new energy grid connection unit is a new energy power supply device that connects to the target power supply area and outputs power to the distribution network according to the control settings; the energy storage unit is an energy storage device that connects to the target power supply area and participates in the power supply regulation of the target load by adjusting the charging and discharging output; the endpoint power supply constraint is a power supply constraint preset according to the rated voltage and continuous power supply requirements of the target load, including the target load end voltage constraint and the target load continuous power supply constraint. Each closed-loop transfer task is executed sequentially according to the task order. While keeping the control settings of the new energy grid-connected unit unchanged, the output of the energy storage unit is adjusted so that the target power supply area enters the alternative power supply state and the return power supply state in sequence.

5. The new energy distribution network fault prediction and health management system according to claim 4, characterized in that, In the closed-loop current transfer execution unit (2), forward current transfer and reverse current transfer are performed according to the same transfer current amplitude. Specifically, this includes: for the same closed-loop current transfer task, configuring the alternative distribution switch and adjusting the output of the energy storage unit so that the power supply current corresponding to the target load is transferred from the initial power supply path to the alternative power supply path, and the amplitude of the transferred power supply current reaches the transfer current amplitude corresponding to the closed-loop current transfer task; after the target power supply area enters the alternative power supply state, configuring the return distribution switch and adjusting the output of the energy storage unit so that the power supply current of the same amplitude returns from the alternative power supply path to the initial power supply path; and in the process of executing the closed-loop current transfer... Before the task, the initial energy storage output of the energy storage unit is obtained when it meets the endpoint power supply constraints in the initial power supply state, and the initial energy storage output is determined as the initial compensation state. After entering the return power supply state, the energy storage return output formed by the energy storage unit to meet the endpoint power supply constraints is obtained during the return verification period. A compensation deviation value is generated based on the difference between the energy storage return output and the energy storage initial output. The closed-loop current transfer task identifier, the energy storage initial output, the energy storage return output, and the compensation deviation value are associated to generate return compensation deviation data. The return verification period is a preset data acquisition period after the target power supply area enters the return power supply state.

6. The new energy distribution network fault prediction and health management system according to claim 5, characterized in that, In the back-trip verification fault location unit (3), the allowable range of compensation deviation is the allowable variation range of compensation deviation corresponding to the target power supply area, including the lower limit of the allowable range and the upper limit of the allowable range, which is used to verify whether the compensation deviation in the return power supply state meets the back-trip closure condition; The allowable range of compensation deviation is determined based on the return compensation deviation data obtained by performing a closed-loop switching task in the target power supply area under normal operating conditions. Each closed-loop switching task corresponding to the same target power supply area adopts the same allowable range of compensation deviation. The return closure result includes return closure and return non-closure, which is used to characterize whether the initial power supply state is restored after the closed-loop switching task enters the return power supply state. The return closure result of each closed-loop current transfer task is determined based on the returned compensation deviation data and the allowable compensation deviation range. Specifically, this includes: reading the compensation deviation value from each returned compensation deviation data, comparing the compensation deviation value with the allowable compensation deviation range of the corresponding target power supply area, and determining the return closure result of the corresponding closed-loop current transfer task as a return closure when the compensation deviation value is within the allowable compensation deviation range, and determining the return closure result of the corresponding closed-loop current transfer task as a return non-closure when the compensation deviation value is not within the allowable compensation deviation range, and associating the return closure result with the corresponding closed-loop current transfer task identifier.

7. The new energy distribution network fault prediction and health management system according to claim 6, characterized in that, In the back-trip verification fault location unit (3), the task back-trip result sequence is a sequence formed by arranging the change identifier and the maintain identifier corresponding to each closed-loop switching task in the order of the task, which is used to check the branch switching participation sequence corresponding to each candidate branch bit by bit. The process of generating a task return result sequence specifically includes: generating a change identifier when the return closure result of a closed-loop transfer task is an incomplete return, generating a hold identifier when the return closure result of a closed-loop transfer task is a closed return, and arranging the generated change identifiers and hold identifiers according to the task sequence number of each closed-loop transfer task to obtain the task return result sequence; each sequence position of the task return result sequence corresponds to a closed-loop transfer task, the task return result sequence has the same sequence length as the sequence of each branch transfer participation sequence, and the same sequence position of the task return result sequence and the branch transfer participation sequence corresponds to the same closed-loop transfer task.

8. The new energy distribution network fault prediction and health management system according to claim 7, characterized in that, In the backhaul verification fault location unit (3), the target fault branch is a candidate branch whose branch transfer participation sequence and the task backhaul result sequence are consistent position by position. The task backhaul result sequence is checked position by position with each branch transfer participation sequence, and the candidate branches with the same sequence are determined as the target fault branch. Specifically, this includes: selecting the same sequence positions in the task backhaul result sequence and each branch transfer participation sequence in the order of the task, comparing the change flag and the keep flag in the same sequence positions, and when the branch transfer participation sequence corresponding to a candidate branch has the same flag in all sequence positions of the task backhaul result sequence, the candidate branch is determined as the matching candidate branch; based on the fact that the branch transfer participation sequences corresponding to each candidate branch are different, the unique matching candidate branch is determined as the target fault branch.

9. The new energy distribution network fault prediction and health management system according to claim 8, characterized in that, In the health boundary management unit (4), the back-trip unclosed task is the closed transfer task in the sequence of the branch transfer participation sequence corresponding to the target fault branch and whose back-trip closure result is back-trip unclosed; Determining the health boundary current specifically includes: reading the currently configured transfer current amplitude of each unclosed loop task, determining the minimum value among them as the starting test current, generating a current level sequence with progressively decreasing current values ​​based on the starting test current, setting the transfer current amplitude of each unclosed loop task to the current test current according to the current level sequence, and repeatedly executing each unclosed loop task; when each unclosed loop task achieves a loop closure result for the first time, the corresponding current test current is determined as the health boundary current. The current operating current of the target fault branch is read from the distribution network operation data. The branch health margin is generated based on the difference between the health boundary current and the current operating current. The target fault branch identifier, health boundary current and branch health margin are associated to generate health management results.

10. A method for fault prediction and health management of a new energy distribution network, used in a fault prediction and health management system for a new energy distribution network as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Obtain distribution network structure data and distribution network operation data, determine the target power supply area and candidate branch set, construct a closed current transfer task including initial power supply state, alternative power supply state, return power supply state and transfer current amplitude, and generate the branch current transfer participation sequence corresponding to each candidate branch according to the power supply participation state of each candidate branch. S2. Execute each closed-loop transfer task, keep the control settings of the new energy grid-connected unit unchanged, adjust the output of the energy storage unit to meet the endpoint power supply constraints, and execute forward and reverse transfer according to the same transfer current amplitude. Generate return compensation deviation data in the return power supply state. S3. Determine the return closure result of each closed-loop transfer task based on the returned compensation deviation data and the allowable range of compensation deviation, and generate the task return result sequence according to the task order. Verify the task return result sequence with the transfer participation sequence of each branch one by one, and determine the candidate branches with the same sequence as the target fault branches. S4. For the back-loop unclosed task corresponding to the target fault branch, gradually reduce the transfer current amplitude and repeat the process. The transfer current amplitude that makes all closed transfer tasks close back-loop for the first time is determined as the health boundary current, and health management results are generated.

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