Multi-target segmented transfer decision-making method and device for power distribution network, and medium

Abstract

The invention discloses a multi-target segmented transfer decision-making method and device for a power distribution network and a medium. The method comprises the following steps: sensing and determining a required transfer power supply scene according to the running state of the current power distribution network; calculating reliability indexes of different types of power supply loads, and selecting a target dual power supply load according to the reliability indexes; calculating influence degree parameters of the power failure event on different types of power supply loads, and calculating a perception degree value of the target dual-power supply load on the power failure event according to the influence degree parameters; equipment topological relation data, switch real-time states and connection lines of a current feeder line of the power distribution network are obtained, a transfer strategy set is generated by traversing the connection lines of the current feeder line and equipment on the current feeder line, and the traversed equipment on the current feeder line comprises selected target dual-power-supply loads; and determining the priority of each target dual-power load according to the sensing degree value. The method has the advantages of being simple in implementation method, low in cost, high in decision-making efficiency and precision, safe, reliable and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control of distribution networks, and in particular to a method, device and medium for making decisions on multi-objective segmented power transfer in distribution networks. Background Art

[0002] The power transfer decision is to maintain the power supply by switching the power supply path when the distribution network fails or is under maintenance. In the existing technology, the dispatcher usually manually selects the optimal power transfer path from the backup line based on the power grid topology and real-time load data. However, the current distribution network has a complex grid structure, and the development of active power generation is accelerating. The access of distributed power sources will have an impact on the voltage stability, power flow distribution, relay protection, etc. of the distribution network. In addition, the peak summer situation is severe, the power load increases in high temperature weather in summer, and the difficulty of balancing power supply and demand increases. Extreme weather will also affect the balance of power supply and demand. Therefore, the manual power transfer decision-making method will have the following problems: 1. The manual power transfer decision-making method requires dispatchers to manually query line connection relationships, analyze the scope of power outages, and formulate power transfer plans based on experience. Therefore, the decision-making efficiency and reliability are not high, the factors that can be considered in the decision-making process are very limited, and the decision-making accuracy is highly dependent on the experience of experts. It is difficult to conduct decision analysis quickly and comprehensively, especially in complex scheduling scenarios. The difficulty and complexity of manual decision-making will increase sharply. Therefore, it takes a long time to generate strategies, and adjustments cannot be made in time. It is difficult to respond quickly to power grid failures. In addition, due to the complex distribution network connection relationship and the large number of operating equipment, the risk of misoperation is also high.

[0003] 2. Manual power transfer decision-making methods are usually limited to local optimization, and it is difficult to take into account the operating efficiency and economy of the entire power grid. In particular, the dual power supply load is usually not considered in the decision-making process. In the face of heavy overloads and frequent fault events, if the dual power supply load is ignored, it will be difficult to generate reliable, safe and economical power transfer decisions for complex grid structures. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides a distribution network multi-objective segmented power supply decision-making method, device and medium with simple implementation method, low cost, high decision-making efficiency and accuracy, and safe and reliable, which can improve the reliability, safety and economy of the distribution network.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is: A distribution network multi-objective segmented power transfer decision method, comprising the following steps: According to the current operating status of the distribution network, the required power supply scenario is perceived and identified, and the power supply scenario includes a heavy overload or a faulty line; Calculating reliability indexes of different types of loads according to the number of power outage events, and selecting target dual-power supply loads according to the reliability indexes; Calculate the impact degree parameters of the power outage event on different types of loads according to the power consumption during the power outage duration, and calculate the perception degree value of the target dual-power supply load to the power outage event according to the impact degree parameters; The device attributes, device topology relationship data, and real-time status of switches and interconnection lines of each device in the current feeder of the distribution network are obtained, and a transfer strategy set is generated by traversing the interconnection lines of the current feeder and the devices on the current feeder, wherein the traversed devices on the current feeder include the selected target dual-power loads, and the priority of each target dual-power load is determined according to the perception degree value. The transfer strategy in the transfer strategy set is the disconnection operation of the interconnection switch between the current feeder and each interconnection line and the disconnection operation of the device on the current feeder.

[0006] Furthermore, the current operating status of the distribution network is sensed according to the following state perception model:

[0007]

[0008]

[0009] in, is the current operating time of the distribution network, is the next operation time of the distribution network, is the state of the distribution network at the next operating moment, For active distribution network nodes, the net load forecast value at the next moment, For the distribution network The number of the line and whether a fault has occurred at the current operating time. is the total number of nodes in the distribution network, is the total number of lines in the active distribution network.

[0010] Furthermore, the calculation expression for calculating the reliability index of different types of loads according to the number of power outage events is:

[0011] in, Indicates load The reliability index, For load Within the specified time The average power per hour, Indicates load Within the specified time The statistical average number of power outages per hour, Indicates the unit hour, It represents the expected value of the annual average power shortage of the load, Represents the maximum value of n.

[0012] Furthermore, the calculation expression of the parameter of the degree of influence of the power outage event on different types of loads is:

[0013]

[0014]

[0015] in, Indicates a power outage event For load The influence parameter of Indicates a power outage event The starting time of occurrence, Indicates a power outage event The time of ending, Indicates a power outage event duration, Indicates the load during the power outage duration The average power consumption, Indicates load The maximum power consumption.

[0016] Furthermore, the load Perception level of power outage The calculation expression is:

[0017]

[0018] in, Indicates the load after an accident occurs in any hour within the specified time. The average impact Indicates load Within the specified time Average power per hour.

[0019] Furthermore, generating a transfer strategy set by traversing the contact lines of the current feeder and the devices on the current feeder includes: By load Perception level of power outage Arrange in ascending order to generate a priority list for dual power loads to participate in the transfer ,in, Indicates feeder Previous A power supply line with dual power loads, Indicates that the current dual power users are fed by feeders powered by, Indicates that the current dual power user is powered by the other end of the feeder; when the feeder is identified When overloaded, follow the priority list Switch the power supply lines of the dual power loads in sequence. If all the dual power loads participate in the power transfer, the feeder If it is still in a heavy overload state, it will switch to a primary power transfer strategy; When executing the one-time transfer strategy, obtain the distribution network feeder Contact lines , traverse the feeder Contact lines and feeder The device obtains the first transfer strategy set ,in The transfer strategy is and The contactor is closed. Devices in Disconnect; if the feeder is disconnected after executing the one-time transfer strategy If it is still in a heavy overload state, it will switch to the secondary power transfer strategy; When executing the secondary transfer strategy, obtain the feeder Contact lines , remove the contact line , traverse Liaisons and Feeders Device, obtain the second transfer strategy set Each time the traversal is performed, the operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. The operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. Contact Line The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is controlled by the interconnection line. Supply power, and then connect the feeder With feeder The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is controlled by the feeder Power supply, where j represents the feeder The number of contact lines, Indicates the feeder line The number of tie lines, and n represents the feeder line The number of devices, Indicates the feeder line The number of devices, and x represents the number of devices and tie lines connected to ; Indicates that the transfer supply strategy is The tie switch of the connected line is closed.

[0020] Further, in the process of traversing the tie lines of the current feeder line and the devices on the current feeder line to generate a set of transfer supply strategies, it further includes screening out false dual-power loads to eliminate false dual-power loads. The false dual-power load is a dual-power load that meets the following conditions: automatic switching is not achieved, the power supplies are not independent, the load is unbalanced, and when there is no switch device protection device, it cannot ensure that the other power supply can supply power normally when one power supply fails. The unachieved automatic switching means that when one power supply fails, the other power supply cannot be automatically connected.

[0021] Further, it further includes calculating multiple grid state parameters corresponding to each transfer supply strategy in the set of transfer supply strategies, calculating the score of each transfer supply strategy according to the calculated multiple grid state parameters, and determining the optimal transfer supply strategy according to the scores of each transfer supply strategy. The grid state parameters include any one or more of the main transformer load rate, line load rate, power supply reliability constraint for important users, power supply reliability constraint for power protection users, effective network architecture constraint, and loop current constraint; the score of the kth transfer supply strategy is The calculation expression is:

[0022] Wherein, Represents the value of the sub-objective function, is the th objective weight coefficient, , Represents the minimum and maximum values of the th objective function in the historical data, Represents the total number of objectives. A computer device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to execute the computer program to execute the method as described above.

[0023] A computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the method as described above is implemented.

[0024] Compared with the prior art, the beneficial effect of the present invention lies in that: the present invention selects the power transfer scenario according to the operating status perception of the distribution network, analyzes the reliability requirements of the dual-power load to determine the dual-power load that needs to participate in the transfer decision, and can determine the dual-power load that needs to participate in the transfer decision according to different reliability requirements. At the same time, by calculating the perception degree value of the target dual-power load to the power outage event, the user's tolerance and perception degree to the power outage are quantitatively evaluated, and then a multi-objective segmented transfer decision is made based on the selected scenario. In the decision-making process, a transfer strategy set is generated by traversing the interconnecting lines of the feeder and the equipment containing the target dual-power load, so that the participation of the dual-power load is considered in the multi-objective segmented transfer decision of the distribution network, and the priority of each target dual-power load is determined according to the perception degree value. A transfer strategy that comprehensively considers reliability, safety and economy can be generated, thereby optimizing the power supply strategy of the distribution network, improving the reliability, safety and economy of the distribution network, and thereby improving the reliability and efficiency of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the implementation flow of the multi-objective segmented power supply transfer decision method of the distribution network in this embodiment. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0027] like Figure 1 As shown, the steps of the multi-objective segmented power transfer decision-making method for the distribution network of this embodiment include: Step S01. According to the current operating state of the distribution network, the required power transfer scenario is sensed and identified, and the power transfer scenario includes heavy overload, faulty line, etc.

[0028] Specifically, it is possible to determine whether the current power grid is operating normally or in a fault state based on the state perception and maintenance plan of the distribution network, and then select the power supply transfer scenario, including heavy overload, planned maintenance and fault handling.

[0029] As an optional implementation, a state perception model may be used to determine the operating state of the power grid. For example, the operating state of the current distribution network may be perceived according to the following state perception model: (1) (2) (3) in, is the current operating time of the distribution network, is the next operation time of the distribution network, is the state of the distribution network at the next operating moment, For active distribution network nodes, the net load forecast value at the next moment, For the distribution network The number of the line and whether a fault has occurred at the current operating time. is the total number of nodes in the distribution network, is the total number of lines in the active distribution network.

[0030] Step S02: Calculate the reliability index of different types of loads according to the number of power outage events, and select the target dual-power load according to the reliability index.

[0031] This embodiment constructs reliability indicators for different types of loads and uses the reliability indicators to analyze differentiated reliability requirements of dual-power loads, so as to determine whether each dual-power load participates in the power transfer strategy based on the load's requirements for reliability.

[0032] Specifically, typical user types that often appear in urban distribution networks, such as commercial users, residential users, non-residential lighting users, and primary and secondary school teaching users, can be selected as loads to be analyzed, and then the reliability index of each type of load can be calculated separately.

[0033] As an optional implementation, the calculation expression for calculating the reliability index of different types of power loads according to the number of power outage events is: (4) in, Indicates load The reliability index, For load Within the specified time The average power per hour, Indicates load Within the specified time The statistical average number of power outages per hour, Indicates the unit hour, It represents the expected value of the annual average power shortage of the load, , express n The maximum value of . The specific configuration can be based on actual needs. For example, when the specified duration is one year, That is 8760.

[0034] Reliability Index is a dimensionless value that reflects the load The ratio of the actual perceived annual power shortage to the average annual power shortage expectation of system users can reflect the differentiated reliability requirements of different users in the same system. When the value The larger the value is, the lower the power reliability level of the load is than the average level of the system. The load may be located in the weak link of the distribution network power supply. Users have a strong demand for improving power supply reliability. The loads with high reliability are prioritized in the decision-making of the transfer of dual power sources. of After the value is The values ​​are sorted from low to high, and then one or more dual-power supply loads with the highest sorting results (that is, the lowest reliability) are taken as the target dual-power supply loads.

[0035] Step S03: Calculate the impact degree parameters of the power outage event on different types of power loads according to the power consumption during the power outage duration, and calculate the perception degree value of the target dual power load to the power outage event according to the impact degree parameters.

[0036] This embodiment uses the power consumption during the power outage duration to calculate the impact parameters of the power outage event on different types of power loads, and then calculates the perception value of the target dual-power load to the power outage event based on the impact parameters. It can quantitatively analyze the perception of the severity of the power outage accident by dual-power users, and then determine the priority of their participation in the power transfer decision based on their tolerance for power outages.

[0037] In order to quantitatively analyze the user's perception of the severity of power outages, it is assumed that a power outage in the distribution network The start time is , End time , such as power outage events Starting from the first hours, ending on the first day of the year hours, causing load Power outage, power outage duration As an optional implementation, a power outage event For load The impact parameter It can be defined as: (5) (6) (7) in, Indicates a power outage event For load The influence parameter of Indicates the load during the power outage duration The average power consumption, Indicates load The maximum power consumption.

[0038] Furthermore, the load Perception level of power outage It can be defined as: (8) (9) in, Indicates the load after an accident occurs in any hour within the specified time. The average impact Indicates load Within the specified time Average power per hour.

[0039] The load calculated in the above way Perception level of power outage is a dimensionless quantity, The larger the power outage, the more severe the impact on users. The greater the impact on the power reliability experience, the more likely the power outage will occur during the period when the user's power demand is large. According to historical data, the corresponding power outage of each dual power user participating in the transfer can be obtained. value, and then in the subsequent process of generating the transfer strategy The value determines the priority of each dual power user. For example, The values ​​are sorted from low to high, and then one or more dual-power supply loads with the highest sorting results (that is, the lowest power outage perception) are taken as the target dual-power supply loads.

[0040] Step S04. Obtain the device attributes, device topology relationship data, and real-time status of switches and interconnection lines of each device in the current feeder of the distribution network, and generate a transfer strategy set by traversing the interconnection lines of the current feeder and the devices on the current feeder, wherein the traversed devices on the current feeder include the selected target dual-power loads, and the priority of each target dual-power load is determined according to the perception degree value. The transfer strategy in the transfer strategy set is the disconnection operation of the interconnection switch between the current feeder and each interconnection line and the disconnection operation of the device on the current feeder.

[0041] This embodiment makes a power transfer decision based on the power transfer scenario selected in step S01, the dual power load selected according to the reliability requirements in step S02, and the perception level of the dual power load to the power outage event obtained in step S03, so that the dual power load can be considered to participate in the multi-objective segmented power transfer decision, analyze the power transfer scenario, identify the power transfer area, calculate the transfer load, the number of transfers, the power transfer reference time and other data based on the power transfer area data, classify the power load according to different needs and importance, and provide dedicated power supply in a segmented manner to improve the reliability and safety of power supply, and generate load power transfer decisions.

[0042] Specifically, the data access component can be used to obtain the equipment model and equipment topology relationship data of the 10kV large feeder of the distribution network from the power grid resource business center. Each device (such as transformer, circuit breaker, switch, etc.) has a unique identifier. and device properties , which can be expressed as , the connection line relationship between devices can be represented by the edge E in graph theory, which can be expressed as , each edge connects two devices, indicating the electrical connection between them. For a 10kV large feeder, a set of device models and topological relationships can be used to represent it. . Device Properties Specifically, it includes the device’s on / off status, type, capacity, location, whether it affects important users, etc., which can be expressed as ,in They respectively represent the on / off status, type, capacity, location, and whether it affects important users of the equipment.

[0043] In a specific application embodiment, the data access component can be used to obtain the real-time status of the switch from the distribution automation system. , and set up automatic data update function At each push time point Triggered to obtain and update the real-time status data of the switch ,Right now .

[0044] As an optional implementation, the following steps may be adopted to traverse the contact lines of the current feeder and the devices on the current feeder to generate a power transfer strategy set: Step S401. Press load Perception level of power outage Arrange in ascending order to generate a priority list for dual power loads to participate in the transfer ,in, Indicates feeder Previous A power supply line with dual power loads, Indicates that the current dual power users are fed by feeders powered by, Indicates that the current dual power user is powered by the other end of the feeder; when the feeder is identified When overloaded, follow the priority list Switch the power supply lines of the dual power loads in sequence. If all the dual power loads participate in the power transfer, the feeder If it is still in a heavy overload state, the process proceeds to step S402 to execute a power transfer strategy.

[0045] Step S402: When executing a power transfer strategy, obtain the distribution network feeder Contact lines , traverse the current feeder Contact lines and current feeder The device obtains the first transfer strategy set ,in The transfer strategy is and The contactor is closed. Devices in Disconnect; if the feeder is disconnected after executing the one-time transfer strategy If it is still in a heavy overload state, the process proceeds to step S403 to execute a secondary power transfer strategy.

[0046] Specifically, the data access component can be used to obtain the distribution network 10kV large feeder from the power grid resource business center Contact lines According to the open-loop operation principle of the line, and The corresponding tie switch is closed. Any device Disconnect, make The load of some equipment and lines is To supply power, then by traversing Contact relationship and distribution network 10kV large feeder Devices can obtain the transfer strategy set , a total of j*n supply transfer strategies, among which The transfer strategy is and The contactor is closed. Devices in Disconnect, a total of one complete operation, referred to as "one on, one off".

[0047] Step S403. When executing the secondary transfer strategy, obtain the feeder Contact lines , remove the contact line , traverse Liaisons and Feeders Device, obtain the second transfer strategy set Each time the traversal is performed, the operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. The operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. Contact Line The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is controlled by the interconnection line. Supply power, and then connect the feeder With feeder The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is controlled by the feeder Power supply, where j represents The number of contact lines, express The number of contact lines, n represents The number of devices, express The number of devices, x represents The number of connected equipment and contact lines, The transfer strategy is The connecting switch of the connected line is closed.

[0048] Specifically, the data access component can be used to obtain the distribution network 10kV large feeder from the power grid resource business center Contact lines , remove the contact line According to the open-loop operation principle of the line, and The corresponding tie switch is closed. Any device Disconnect, make The load of some equipment and lines is Power supply, then and The corresponding tie switch is closed. Any device Disconnect, make The load of some equipment and lines is To supply power, the fixed operation sequence is to operate the contact line first and then the current line, and close first and then open. Contact relationship and distribution network 10kV large feeder Devices can obtain the transfer strategy set ,total A power transfer strategy, a total of two complete operations, referred to as "two close and two disconnect".

[0049] This embodiment first uses the state perception model to monitor the power grid operation status in real time and identify the heavily overloaded / faulty lines. , filter out all the dual power supply sets on the line, and then according to the reliability index Filter out The dual power supply with a higher value (such as exceeding the preset threshold) is used as the target dual power load, and then the dual power transfer, primary transfer and secondary transfer are performed in sequence. During the dual power transfer process, the sensed value is used to Arrange and generate a priority list for dual power loads to participate in the transfer, according to the priority list Switch the power supply lines of the dual power loads in turn, giving priority to the dual power on the heavy-load line to transfer to another power source. If all the dual power loads participate in the transfer, the feeder If the feeder is still in a heavy overload state, it will execute the power transfer strategy again. If it is still in a heavy overload state, it will switch to the secondary power transfer strategy, which can fully consider the dual power users to implement phased power transfer decisions and can be flexibly applied to different power transfer scenarios to complete power transfer decisions safely and reliably.

[0050] Furthermore, the closing state of the switch on the opposite side of the heavy-load line connected to the switch on the opposite side of the line can be considered. Contact lines and remove them , recursively traverse according to the contact relationship and equipment to obtain the third transfer strategy set Specifically, similar to step S402, further consideration is given to Contact lines and remove them , according to the contact relationship and equipment, recursive traversal can be used to obtain the transfer strategy , a total of three complete operations, referred to as "three close and three break", can be further extended to the closed state of the y-th opposite side tie switch to obtain .

[0051] The strategy set generated according to the above steps takes into account the participation of dual-power users in the power transfer decision, but there may actually be false dual-power users. In order to avoid the influence of false dual-power users on the generation of the power transfer strategy, this embodiment further includes screening out false dual-power loads to eliminate false dual-power loads in the process of traversing the contact lines of the current feeder and the devices on the current feeder to generate the power transfer strategy set. The false dual-power load is a dual-power load that meets the following conditions: 1. Automatic switching is not achieved: Although there are two power sources connected, there is no automatic switching device. As a result, when one power source fails, the other power source cannot be automatically connected, causing a power outage.

[0052] 2. The power supplies are not independent: The two power supplies may come from the same power supply, such as the same substation. If there is a problem with the substation, both power supplies will fail at the same time.

[0053] 3. Load imbalance: In theory, there are two power supplies, but the load distribution is unreasonable, causing one power supply to bear too much load, which increases the risk of failure.

[0054] 4. When there is no switchgear protection device, it is impossible to ensure that another power supply can supply power normally when one power supply fails.

[0055] The power supply transfer decisions containing fake dual power users can be screened according to the above-mentioned characteristics of the "fake dual power users" to further remove the power supply transfer decisions containing fake dual power users.

[0056] Furthermore, in the process of traversing the interconnecting lines of the current feeder and the equipment on the current feeder to generate a transfer strategy set, it also includes calculating a variety of grid state parameters corresponding to each transfer strategy in the transfer strategy set, calculating a score for each transfer strategy based on the calculated multiple grid state parameters, and determining the optimal transfer strategy based on the scores of each transfer strategy. The grid state parameters include main transformer load rate, line load rate, power supply reliability constraints for important users, power supply reliability constraints for power-guarantee users, effective network architecture constraints, closed-loop current constraints, etc., and a variety of grid state parameters can be combined to effectively determine the optimal transfer strategy that meets the requirements.

[0057] In a specific application embodiment, the kth supply transfer strategy Rating The calculation expression can be: (10) in, Statement sub-objective function values, For the The target weight coefficient, , Indicates the historical data The minimum and maximum values ​​of the objective function, Indicates the total target quantity. Specifically, the corresponding score values ​​of each transfer strategy can be calculated according to the above formula (10) and then sorted, and the transfer strategy with the highest score value is selected as the optimal transfer strategy to achieve the corresponding transfer decision.

[0058] In summary, this embodiment selects the power supply transfer scenario according to the operating status perception of the distribution network, and further calculates the reliability index of different types of loads according to the number of power outage events, so as to analyze the reliability requirements of the dual-power load, and selects the target dual-power load according to the reliability index, that is, determines the dual-power load that needs to participate in the power supply transfer decision, which can emphasize the differentiated reliability requirements of different user types, determine the dual-power load that needs to participate in the power supply transfer decision according to different reliability requirements, and at the same time calculates the impact degree parameters of the power outage event on different types of power loads according to the power consumption during the power outage duration, and calculates the target dual-power load according to the impact degree parameters. The perception degree value of power outage events is used to quantitatively evaluate users' tolerance and perception of power outages, and then multi-objective segmented power transfer decisions are made based on selected scenarios. During the decision-making process, a set of transfer strategies is generated by traversing the interconnecting lines of the feeder and the equipment containing the target dual-power loads, so that the participation of dual-power loads is considered in the multi-objective segmented power transfer decision of the distribution network, and the priority of each target dual-power load is determined according to the perception degree value. A transfer strategy that comprehensively considers reliability, safety and economy can be generated, thereby optimizing the power supply strategy of the distribution network, improving the reliability, safety and economy of the distribution network, and thereby improving the reliability and efficiency of power supply.

[0059] This embodiment further provides a computer device, including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program to perform the above method.

[0060] It is understandable that the above method of this embodiment can be executed by a single device, such as a computer or server, etc., and can also be applied to a distributed scenario and completed by multiple devices in cooperation with each other. In the case of a distributed scenario, one of the multiple devices can only execute one or more steps in the above method of this embodiment, and multiple devices interact to complete the above method. The processor can be implemented in the form of a general-purpose CPU, a microprocessor, an application-specific integrated circuit, or one or more integrated circuits, etc., for executing related programs to implement the above method of this embodiment. The memory can be implemented in the form of a read-only memory ROM, a random access memory RAM, a static storage device, and a dynamic storage device. The memory can store an operating system and other applications. When the above method of this embodiment is implemented by software or firmware, the relevant program code is stored in the memory and called and executed by the processor.

[0061] This embodiment further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the above method is implemented.

[0062] Those skilled in the art should understand that the above-mentioned embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0063] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-objective segmented power transfer decision method for a distribution network, characterized in that the steps include: According to the current operating status of the distribution network, the required power supply scenario is perceived and identified, and the power supply scenario includes a heavy overload or a faulty line; Calculating reliability indexes of different types of loads according to the number of power outage events, and selecting target dual-power supply loads according to the reliability indexes; Calculate the impact degree parameters of the power outage event on different types of loads according to the power consumption during the power outage duration, and calculate the perception degree value of the target dual-power supply load to the power outage event according to the impact degree parameters; The device attributes, device topology relationship data, and real-time status of switches and interconnection lines of each device in the current feeder of the distribution network are obtained, and a transfer strategy set is generated by traversing the interconnection lines of the current feeder and the devices on the current feeder, wherein the traversed devices on the current feeder include the selected target dual-power loads, and the priority of each target dual-power load is determined according to the perception degree value. The transfer strategy in the transfer strategy set is the disconnection operation of the interconnection switch between the current feeder and each interconnection line and the disconnection operation of the device on the current feeder.

2. The distribution network multi-objective segmented power transfer decision method according to claim 1 is characterized in that: The current operating status of the distribution network is perceived according to the following state perception model: in, is the current operating time of the distribution network, is the next operation time of the distribution network, is the state of the distribution network at the next operating moment, For active distribution network nodes, the net load forecast value at the next moment, For the distribution network The number of the line and whether a fault has occurred at the current operating time. is the total number of nodes in the distribution network, is the total number of lines in the active distribution network.

3. The distribution network multi-objective segmented power transfer decision method according to claim 1 is characterized in that: The calculation expression for calculating the reliability index of different types of loads according to the number of power outage events is: in, Indicates load The reliability index, For load Within the specified time The average power per hour, Indicates load Within the specified time The statistical average number of power outages per hour, Indicates the unit hour, It represents the expected value of the annual average power shortage of the load, express The maximum value of .

4. The distribution network multi-objective segmented power transfer decision method according to claim 1 is characterized in that: The calculation expression of the parameter of the influence degree of the power outage event on different types of loads is: in, Indicates a power outage event For load The influence parameter of Indicates a power outage event The starting time of occurrence, Indicates a power outage event The time of ending, Indicates a power outage event duration, Indicates the load during the power outage duration The average power consumption, Indicates load The maximum power consumption, For load Within the specified time Average power per hour.

5. The distribution network multi-objective segmented power transfer decision method according to claim 1 is characterized in that: load Perception level of power outage The calculation expression is: in, Indicates the load after an accident occurs in any hour within the specified time. The average impact Indicates a power outage event For load The influence parameter of Indicates load The maximum power consumption, Indicates load Within the specified time The average power per hour, express The maximum value of .

6. The distribution network multi-objective segmented power transfer decision method according to any one of claims 1 to 5, characterized in that: The generating of the power transfer strategy set by traversing the contact line of the current feeder and the equipment on the current feeder includes: By load Perception level of power outage Arrange in ascending order to generate a priority list for dual power loads to participate in the transfer ,in, Indicates feeder Previous A power supply line with dual power loads, Indicates that the current dual power users are fed by feeders powered by, Indicates that the current dual power user is powered by the other end of the feeder; when the feeder is identified When overloaded, follow the priority list Switch the power supply lines of the dual power loads in sequence. If all the dual power loads participate in the power transfer, the feeder If it is still in a heavy overload state, it will switch to a primary power transfer strategy; When executing the one-time transfer strategy, obtain the distribution network feeder Contact lines , traverse the feeder Contact lines and feeder The device obtains the first transfer strategy set ,in The transfer strategy is and The contactor is closed. Devices in Disconnect; if the feeder is disconnected after executing the one-time transfer strategy If it is still in a heavy overload state, it will switch to the secondary power transfer strategy; When executing the secondary transfer strategy, obtain the feeder Contact lines , remove the contact line , traverse Liaisons and Feeders Device, obtain the second transfer strategy set Each time the traversal is performed, the operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. The operation sequence is as follows: first operate the contact line and then the current line, and first close and then open. Contact Line The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is controlled by the interconnection line. Supply power, and then connect the feeder With feeder The corresponding tie switch is closed, and the feeder Any device Disconnect the feeder The load of some equipment and lines is determined by the feeder Power supply, where j represents the feeder The number of contact lines, Indicates feeder The number of interconnection lines, n represents the feeder The number of devices, Indicates feeder The number of devices, x represents The number of connected equipment and contact lines, The transfer strategy is The connecting switches of the connected lines are closed.

7. The distribution network multi-objective segmented power transfer decision method according to any one of claims 1 to 5, characterized in that: The process of traversing the interconnection lines of the current feeder and generating a set of transfer strategies for the devices on the current feeder also includes identifying false dual power loads to screen transfer strategies containing false dual power loads. The false dual power loads are dual power loads that meet the following conditions: automatic switching is not achieved, the power sources are not independent, the load is unbalanced, and when there is no switching device protection device, it is impossible to ensure that the other power source can supply power normally when one power source fails. The failure to achieve automatic switching means that when one power source fails, the other power source cannot be automatically connected.

8. The distribution network multi-objective segmented power transfer decision method according to any one of claims 1 to 5, characterized in that: It also includes calculating a plurality of grid state parameters corresponding to each transfer strategy in the transfer strategy set, calculating a score for each transfer strategy based on the calculated plurality of grid state parameters, and determining an optimal transfer strategy based on the scores of each transfer strategy, wherein the grid state parameters include any one or more of a main transformer load rate, a line load rate, a power supply reliability constraint for important users, a power supply reliability constraint for power-guarantee users, an effective network architecture constraint, and a closed-loop current constraint; the kth transfer strategy Rating The calculation expression is: in, Statement sub-objective function values, For the The target weight coefficient, , Indicates the historical data The minimum and maximum values ​​of the objective function, Indicates the total number of targets.

9. A computer device comprising a processor and a memory, wherein the memory is used to store a computer program, wherein: The processor is configured to execute the computer program to perform the method according to any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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