Power-loss self-healing method and device of transformer substation, equipment and medium

Abstract

The invention discloses a power-loss self-healing method and device for a transformer substation, equipment and a medium. The power-loss self-healing method for the transformer substation comprises the steps that real-time three-phase telemetering current, three-phase telemetering phase voltage and line voltage of a bus of the transformer substation associated with a power distribution automation master station system are collected; determining a first bus belonging to a no-voltage state in the buses according to a line topology state corresponding to the transformer substation, the three-phase telemetering current, the three-phase telemetering phase voltage, the line voltage and a jump threshold; determining a target series supply source corresponding to the first bus according to the remote control authority and the automatic configuration of the interconnection switch associated with the first bus, the load rate corresponding to the opposite side line associated with the interconnection switch, the user level priority corresponding to the opposite side line and the line transfer priority; and transferring the first bus to the target series supply source according to the voltage loss state. The method can improve the stability of the power grid.

Description

TECHNICAL FIELD

[0001] The present application relates to, but is not limited to, the technical field of power grid control, and in particular to a power loss self-healing method and device, equipment and medium for a transformer substation. BACKGROUND

[0002] With the increasingly widespread application of power grids, users' requirements for power supply reliability and modern power supply service systems continue to improve. However, with the continuous growth of power load, the construction of urban power grids continues to expand the scale of power grids, the length of overhead lines and cables continues to increase, the system becomes more and more complex, and the load to be supplied becomes larger and larger. In the face of seasonal weather disasters, industrial and commercial power peaks and other situations, the transformer substation is prone to lose voltage and power off due to overload, faults or high-voltage power distribution special situations, thereby causing large-area power off of the power distribution lines associated with the transformer substation. The existing method relies on maintenance personnel to manually analyze the whole-station transfer-out scheme, and performs transfer supply through manual on-site operation or manual remote control, which reduces the recovery speed of the transformer substation in the event of power loss due to voltage loss, and because multiple lines are simultaneously transferred out, improper operation process can easily cause overload of other transfer supply source lines or power loss of important users. Improper handling of whole-station power loss and busbar power loss will seriously affect the stability of the power grid, and even cause operation disputes. SUMMARY

[0003] The embodiments of the present application provide a power loss self-healing method and device, equipment and medium for a transformer substation, which can improve the stability of the power grid.

[0004] In a first aspect, the embodiments of the present application provide a power loss self-healing method for a transformer substation, applied to a power distribution automation master station system, and the power loss self-healing method for the transformer substation comprises the following steps: Collecting real-time three-phase telemetering currents, three-phase telemetering phase voltages and line voltages of a busbar of a transformer substation associated with the power distribution automation master station system; Determining a first busbar belonging to a voltage loss state in the busbar according to a line topology state corresponding to the transformer substation, the three-phase telemetering currents, the three-phase telemetering phase voltages, the line voltages and a jump threshold value; Determining a target string supply source corresponding to the first busbar according to a remote control authority and an automation configuration of a tie switch associated with the first busbar, a load rate corresponding to an opposite side line associated with the tie switch, a user level priority corresponding to the opposite side line and a line transfer supply priority; Transferring the first busbar to the target string supply source according to the voltage loss state.

[0005] In a second aspect, a power loss self-healing device for a transformer substation is applied to a power distribution automation master station system, and the power loss self-healing device for the transformer substation comprises the following steps: The data acquisition module is configured to acquire real-time three-phase telemetry current, three-phase telemetry phase voltage and line voltage of a bus of a substation associated with the power distribution automation master station system. The first calculation module is configured to determine a first bus belonging to a voltage loss state in the bus according to a line topology state corresponding to the substation, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage and a jump threshold value. The second calculation module is configured to determine a target string supply source corresponding to the first bus according to a remote control authority and an automation configuration of a tie switch associated with the first bus, a load rate corresponding to an opposite side line associated with the tie switch, a user level priority corresponding to the opposite side line and a line transfer priority. The transfer module is configured to transfer the first bus to the target string supply source according to the voltage loss state.

[0006] In a third aspect, an electronic device is provided and includes: at least one processor; at least one memory configured to store at least one program; when at least one of the programs is executed by at least one of the processors, the method of the first aspect is implemented.

[0007] In a fourth aspect, a computer readable storage medium is provided and stores computer executable instructions for implementing the method of the first aspect.

[0008] In summary, the power failure self-healing method of the substation of the above-mentioned embodiments of the present application is applied to a power distribution automation master station system, and the power failure self-healing method of the substation comprises the following steps: collecting real-time three-phase remote measurement currents, three-phase remote measurement phase voltages and line voltages of a bus of a substation associated with the power distribution automation master station system; determining a first bus belonging to a voltage failure state in the bus according to a line topology state corresponding to the substation, the three-phase remote measurement currents, the three-phase remote measurement phase voltages, the line voltages and a jump threshold value; determining a target string supply source corresponding to the first bus according to a remote control authority and an automation configuration of a tie switch associated with the first bus, a load rate corresponding to an opposite side line associated with the tie switch, a user level priority corresponding to the opposite side line and a line transfer priority; and transferring the first bus to the target string supply source according to the voltage failure state. The first bus belonging to the voltage failure state is determined according to the line topology state corresponding to the substation, the three-phase remote measurement currents, the three-phase remote measurement phase voltages, the line voltages and the jump threshold value, which can determine the existence of the bus voltage failure fault in the substation in terms of voltage level according to the three-phase remote measurement phase voltages, the line voltages and the jump threshold value, and then verify the voltage failure state in terms of current level according to the three-phase remote measurement currents, and finally accurately locate the first bus in the voltage failure state according to the line topology state corresponding to the substation, which can avoid manual intervention and improve the response speed while ensuring the accuracy of the determination of the first bus in the voltage failure state. Then, the target string supply source corresponding to the first bus is determined according to the remote control authority and the automation configuration of the tie switch associated with the first bus, the load rate corresponding to the opposite side line associated with the tie switch and the user level priority corresponding to the opposite side line, which can select the first bus with the automatic switching capability according to the remote control authority and the automation configuration of the tie switch associated with the first bus on the basis of the accurate first bus, and then determine the target string supply source corresponding to the first bus according to the load rate of the initial string supply source in descending order, in combination with the weight associated with the user level priority corresponding to the initial string supply source and the line transfer priority, which can improve the stability of the target string supply source. Finally, the first bus is transferred to the target string supply source according to the voltage failure state, which can automatically transfer the first bus to the target string supply source according to the tie switch associated with the first bus on the basis of the accurate first bus and the target string supply source, thereby improving the response speed of the self-healing of the substation and further improving the stability of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a step flow chart of a power failure self-healing method of a substation provided by an embodiment of the present application; Figure 2 is a hardware schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0010] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0011] It can be understood that, although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a manner different from the module division in the device or the order in the flowchart. The terms "first", "second", and the like in the specification, claims, or above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0012] With the increasingly widespread application of power grids, users' requirements for power supply reliability and modern power supply service system continue to improve. However, with the continuous growth of power load, the construction of urban power grids continues to expand the scale of power grids, the length of overhead lines and cables continues to increase, the system becomes more and more complex, and the load to be supplied becomes larger and larger. In the face of seasonal weather disasters, industrial and commercial power peaks, and the like, the substation is prone to lose voltage and power off due to overload, failure or high-voltage power distribution special conditions, thereby causing large-area power off of the distribution lines associated with the substation. The existing method relies on maintenance personnel to manually analyze the whole-station transfer scheme, and performs transfer supply through manual on-site operation or manual remote control, which reduces the recovery speed of the substation in the event of failure, loss of voltage and power off, and because multiple lines are simultaneously transferred, improper operation process can easily cause overload of other transfer source lines or power loss of important users. Improper handling of whole-station power loss and busbar power loss will seriously affect the stability of the power grid, and even cause operation disputes.

[0013] Based on this, the embodiments of the present application provide a substation power loss self-healing method and device, equipment and medium, which can improve the stability of the power grid.

[0014] The embodiments of the present application provide a substation power loss self-healing method, which is applied to a power distribution automation master station system, and with reference to FIG. 1, the substation power loss self-healing method can include but is not limited to the following steps: Figure 1 Step S100, collecting real-time three-phase telemetry current, three-phase telemetry phase voltage and line voltage of a busbar of a substation associated with the power distribution automation master station system.

[0015] ​For example, the three-phase telemetry current is remotely measured in real time through the current transformers corresponding to the MCB (low-voltage side switch), TCB (bus tie switch), and FCB (outgoing line switch) of the substation busbar, which are associated with the distribution automation master station system. The three-phase telemetry current has the same waveform frequency and amplitude, but the phases differ by 120 degrees. Specifically, the current transformer can be a three-phase current sensor or a flexible AC sensor, and this application is not limited in this regard. The three-phase telemetry phase voltage and line voltage are remotely measured in real time through the voltage transformers corresponding to the MCB (low-voltage side switch), TCB (bus tie switch), and FCB (outgoing line switch) of the substation busbar, which are associated with the distribution automation master station system. The three-phase telemetry phase voltage is the voltage of each live wire in the busbar relative to the neutral point (i.e., zero point), and the line voltage refers to the voltage between any two live wires in the busbar. Specifically, the voltage transformer can be a multi-function instrument, a smart phase volt-ampere meter, or a power analyzer, etc., and this application is not limited in this regard.

[0016] For example, the distribution automation master station system collects the three-phase telemetry phase voltage and line voltage of all busbars involved in the substation in real time, and simultaneously collects the corresponding three-phase telemetry current of the substation in real time. The three-phase telemetry current includes the first telemetry current of the substation's outgoing line switch (FCB), the second telemetry current of the transformer low-voltage side switch (MCB), and the third telemetry current of the substation's bus tie switch (TCB). The collected three-phase telemetry current, three-phase telemetry phase voltage, and line voltage are stored in the database.

[0017] Step S110: Determine the first busbar in the undervoltage state based on the line topology status, three-phase telemetry current, three-phase telemetry phase voltage, line voltage, and jump threshold corresponding to the substation.

[0018] For example, if any one of the three-phase telemetry phase voltages or line voltages is below a voltage threshold and the three-phase telemetry current is below a current threshold, and at least one of the three-phase telemetry phase voltages and line voltages experiences a decrease exceeding a jump threshold within 10 minutes, a busbar undervoltage fault is determined in the substation. The first busbar in the undervoltage state is identified, and a busbar transfer task corresponding to the first busbar undervoltage fault is generated. In other embodiments, if other busbar undervoltage faults have occurred in the same substation within 5 minutes, when a new busbar undervoltage fault occurs, it is determined whether all buses in the substation are in an undervoltage state. If all buses in the substation are in an undervoltage state, the system will merge the busbar undervoltage tasks generated within 5 minutes and create a new whole-substation undervoltage transfer task to export the user load of the entire substation.

[0019] For example, when a busbar or station-wide power failure occurs, the distribution automation master station system will first set the busbar or station-wide power failure to a power outage state, prohibiting the power outage busbar from being used as a transfer source, thus preventing the target load from being transferred by other simultaneously power-loss first buses.

[0020] Step S120: Determine the target series power source corresponding to the first bus based on the remote control authority and automation configuration of the tie switch associated with the first bus, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority.

[0021] For example, the first busbar is connected to the line outside the substation to which the first busbar belongs via a tie switch, that is, the first busbar is not a single radial line. In this case, the first busbar with automatic switching capability is selected according to the remote control authority and automation configuration of the tie switch associated with the first busbar. Then, according to the load rate of the opposite line associated with the tie switch and the user priority of the opposite line, the opposite line with low load rate and low user priority is selected as the target series power source corresponding to the first busbar, which can make the target series power source more stable.

[0022] Step S130: Transfer the power from the first bus to the target series power source according to the undervoltage state.

[0023] For example, firstly, the MCB switch of the first busbar in the associated undervoltage state is pulled to ensure that the target series power source will not trip due to supplying power to the transformer of the first busbar during the power transfer. Then, the FCB switch of the line of the target series power source is closed, allowing the first busbar to obtain power from the target transfer source line. Subsequently, the first busbar with the undervoltage fault can drive all single radial lines (lines without tie switches) below the first busbar that meet the load transfer conditions to restore power supply. Through the tie transfer and busbar series power supply operations of the first busbar, the maximum load transfer to the first busbar and the substation can be achieved.

[0024] For example, this application embodiment first determines the first busbar in the undervoltage state based on the line topology status corresponding to the substation, three-phase telemetry current, three-phase telemetry phase voltage, line voltage, and jump threshold. It can determine the existence of a busbar undervoltage fault in the substation from a voltage level perspective based on the three-phase telemetry phase voltage, line voltage, and jump threshold. Then, it further verifies the undervoltage state from a current level perspective by combining the three-phase telemetry current. Finally, it accurately locates the first busbar in the undervoltage state based on the line topology status corresponding to the substation. Compared with the prior art which relies on manual judgment, this avoids manual intervention, thereby improving response speed while ensuring the accuracy of identifying the first busbar in the undervoltage state. Then, it determines the first busbar in the undervoltage state based on the remote control authority and automation configuration of the tie switch associated with the first busbar, and the load rate of the opposite line associated with the tie switch. Furthermore, the target series power source corresponding to the first busbar is determined by prioritizing the user level of the corresponding line on the opposite side. Based on the accurate first busbar, the first busbar with automatic transfer capability can be selected according to the remote control authority and automation configuration of the tie switch associated with the first busbar. Then, the load rate corresponding to the initial series power source is sorted in descending order. Combining the weight associated with the user level priority of the initial series power source and the line transfer priority, the target series power source corresponding to the first busbar is determined, which can improve the stability of the target series power source. Finally, the first busbar is transferred to the target series power source according to the undervoltage state. Based on the accurate first busbar and the target series power source, the tie switch associated with the first busbar can automatically transfer the first busbar to the target series power source, thereby improving the self-healing response speed of the substation and thus improving the stability of the power grid.

[0025] In some embodiments, the first busbar in the undervoltage state is determined based on the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the jump threshold. The substation's power outage self-healing method includes: Obtain voltage comparison data of substations associated with the distribution automation master station system from the database of the distribution automation master station system; The voltage comparison data is updated based on the three-phase telemetry phase voltage, line voltage, and jump threshold. Select a second busbar from the busbars that meets the condition that the three-phase telemetry phase voltage is greater than or equal to the switching threshold, and associate the second busbar with the switching state. Based on the line topology status, switching status, three-phase telemetry current, three-phase telemetry phase voltage, line voltage, and threshold waiting time, the first busbar belonging to the undervoltage state is selected from the second busbar.

[0026] For example, the distribution automation master station system acquires telemetry data of the substation in real time. The telemetry data includes the initial three-phase telemetry phase voltage, the initial line voltage, and the initial three-phase telemetry current. Every 10 seconds, the loop process extracts the three-phase telemetry phase voltage, line voltage, and three-phase telemetry current of the substation bus stored in the distribution automation master station system. If the three-phase telemetry phase voltage and line voltage are lower than the voltage threshold and the three-phase telemetry current is lower than the current threshold, the three-phase telemetry phase voltage is marked as an undervoltage voltage, and the acquisition time of the three-phase telemetry phase voltage is recorded in the database of the distribution automation master station system.

[0027] For example, firstly, voltage comparison data of substations associated with the distribution automation master station system are obtained from the database of the distribution automation master station system. The voltage comparison data is updated based on three-phase telemetry phase voltage, line voltage, and jump threshold. A second busbar that meets the condition that the three-phase telemetry phase voltage is greater than or equal to the jump threshold is selected from the busbars. Simultaneously, the second busbar is associated with the jump status. By comparing the three-phase telemetry phase voltage, line voltage, and jump threshold, the second busbar in the jump status can be automatically marked, reducing manual intervention and supporting rapid response to voltage instability issues. Then, based on the line topology status, jump status, three-phase telemetry current, and three-phase telemetry... The first busbar belonging to the undervoltage state is selected from the second busbars based on phase voltage, line voltage, and threshold waiting time. From the second busbars, the first busbar belonging to the jump state, with zero three-phase telemetry current and a three-phase telemetry phase voltage and line voltage continuously below the voltage threshold for a period longer than the threshold waiting time, is marked as being in the undervoltage state. Based on the jump state, the undervoltage state is cross-verified by combining the three-phase telemetry current in terms of current level and the three-phase telemetry phase voltage and line voltage in terms of voltage level. Finally, the threshold waiting time is used to further verify the first busbar to avoid the error of instantaneous undervoltage, thereby improving the accuracy of the first busbar belonging to the undervoltage state.

[0028] In some embodiments, the voltage comparison data includes multiple sequentially connected first-phase voltages and second-phase voltages, where a first acquisition time corresponding to the first-phase voltage is before a second acquisition time corresponding to the second-phase voltage. The voltage comparison data is updated based on three-phase telemetry phase voltages, line voltages, and transition thresholds. The substation power outage self-healing method includes: If the three-phase telemetry phase voltage or line voltage is detected to be a step-down, and any one of the three-phase telemetry phase voltage or line voltage is greater than or equal to the jump threshold, the first phase voltage is updated based on the second phase voltage, and the second phase voltage is updated based on the three-phase telemetry phase voltage. The first voltage is updated based on the second voltage, and the second voltage is updated based on the line voltage. Conversely, if both the three-phase telemetry phase voltage and the line voltage are less than the jump threshold, the second phase voltage is updated based on the three-phase telemetry phase voltage while keeping the first phase voltage and the line voltage unchanged. If the three-phase telemetry phase voltage or line voltage is detected to be boosted, the first phase voltage and the second phase voltage are updated simultaneously based on the three-phase telemetry phase voltage, and the first voltage and the second voltage are updated simultaneously based on the line voltage. If the three-phase telemetry phase voltage and line voltage do not change and the time threshold is met, update the first phase voltage based on the second phase voltage and update the second phase voltage based on the three-phase telemetry phase voltage, and update the first voltage based on the second voltage and update the second voltage based on the line voltage. The updated first phase voltage, the updated second phase voltage, the updated first voltage, and the updated second voltage are stored in the database.

[0029] For example, when a voltage drop is detected in the three-phase telemetry phase voltage or line voltage, and any one of the three-phase telemetry phase voltages or line voltages is greater than or equal to the jump threshold, the first phase voltage is updated based on the second phase voltage, while the second phase voltage is updated based on the three-phase telemetry phase voltage. Simultaneously, the first voltage is updated based on the second voltage, and the second voltage is updated based on the line voltage. This can capture valid jump states and avoid missed detections. Conversely, when both the three-phase telemetry phase voltage and line voltage are less than the jump threshold, the second phase voltage is updated based on the three-phase telemetry phase voltage while keeping the first phase voltage and line voltage unchanged. This can handle cumulative changes caused by equipment aging, avoid frequent false alarms, effectively distinguish between jump states and cumulative changes, avoid missing triggers due to fluctuations in sound amplitude, and ensure data continuity, providing a reliable basis for subsequent undervoltage state judgment. Accuracy: When the three-phase telemetry phase voltage or line voltage is detected to be boosted, the first phase voltage and the second phase voltage are updated simultaneously based on the three-phase telemetry phase voltage, and the first voltage and the second voltage are updated simultaneously based on the line voltage, eliminating data lag, making it more sensitive to subsequent voltage drop events, and improving overall response agility; When the three-phase telemetry phase voltage and line voltage are detected to be unchanged and meet the time threshold, the first phase voltage is updated based on the second phase voltage, and the second phase voltage is updated based on the three-phase telemetry phase voltage, and the first voltage is updated based on the second voltage, and the second voltage is updated based on the line voltage, and the data is maintained regularly when the voltage is stable to prevent long-term unupdated jump interference, ensuring that only recent relevant events are focused on, and improving the accuracy of voltage loss state judgment; The updated first phase voltage, updated second phase voltage, updated first voltage, and updated second voltage are stored in the database.

[0030] In some embodiments, after selecting the first busbar belonging to the undervoltage state from the second busbars based on the jump state, three-phase telemetry current, three-phase telemetry phase voltage, line voltage, and threshold waiting time, the substation power outage self-healing method further includes: The target substation to which the first busbar belongs is selected from the substations; If all busbars of the target substation are in a state of undervoltage, the undervoltage state of the substation and the entire substation is correlated.

[0031] For example, when a first busbar is found to be under pressure, a power transfer task will be automatically generated, and dispatch personnel will be notified to handle the situation promptly via alarms, pop-ups, or event log reminders. Each time a power transfer task for a first busbar under pressure is automatically initiated, the first busbar and the start time are recorded in the database. Before initiating power transfer tasks for other busbars under pressure, it is first checked whether other busbars within the same substation have also experienced pressure loss within 5 minutes. If not all busbars in the substation are under pressure, the power transfer task for the busbar under pressure continues; if all busbars in the substation are under pressure, the substation and the overall substation under pressure status are associated, and a power transfer task for the entire substation under pressure is initiated. This embodiment of the application can consider the overall substation under pressure status and respond quickly to situations where the entire substation is under pressure.

[0032] In some embodiments, the target series power source corresponding to the first busbar is determined based on the remote control authority and automation configuration of the tie switch associated with the first busbar, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority. The substation power outage self-healing method includes: The first power source is determined based on the remote control authority and automation configuration of the tie switch in the tie switch associated with the first busbar, which belongs to the non-single-radial type. The second source of the target source is determined by sorting the first source in descending order according to the load rate of the first source and combining the weight associated with the user level priority of the first source with the line transfer priority. The target series power source is determined based on the remote control authority, automation configuration, load rate, user level priority, and line transfer priority of the tie switch associated with the first busbar belonging to the single-radial type.

[0033] For example, based on the remote control authority and automation configuration of the tie switch associated with the first busbar belonging to the non-single-radial type, a first string power source with automatic transfer capability is selected. Then, the first string power sources are sorted in descending order according to their corresponding load rates. Combining the weight associated with the user level priority of the first string power source and the line transfer priority, a second string power source for the target string power source is determined. This can prioritize the selection of lines with low load rates to prevent cascading failures caused by overloads, while selecting lines with lower user level priority to ensure the stability of lines with higher user level priority. In addition, lines in a state of undervoltage can be avoided based on the line transfer priority, thus making the second string power source more stable. Similarly, the method for determining the bus string power source is basically the same as the method for determining the second string power source described above, and will not be elaborated here.

[0034] For example, among all single-radial type lines without tie switches, the scheme with the highest user level and the largest load rate is selected, and the line switches of other single-radial lines (i.e., the first busbar) that cannot be transferred are connected to the busbar in series.

[0035] In some embodiments, the first busbar is switched to a target series power supply source according to the power outage state, and the substation power outage self-healing method includes: Mark the first busbar as de-energized and disconnect the bus tie switch associated with the first busbar; Disconnect the outgoing switch associated with the first busbar that is not of the single-radial type, and close the tie switch between the second power supply and the first busbar that is not of the single-radial type. Disconnect the low-voltage side switch of the transformer associated with the first busbar; Disconnect the outgoing switch associated with the first busbar of the second string power supply and the main string power supply that is not available; The outgoing switch associated between the closing bus string power supply and the first bus, which is of the single-radial type.

[0036] For example, before performing the power transfer task for busbar or substation power failure, the first busbar or all busbars of the substation are marked as de-energized. This prevents the first busbar or associated lines of the substation from being used as power transfer sources at the logical level. At the same time, the bus tie switch associated with the first busbar is disconnected to prevent power from being supplied to the first busbar through the bus tie switch during series power supply. Then, the outgoing switch associated with the first busbar that is not of the single-radial type is disconnected, and the tie switch between the second series power source and the first busbar that is not of the single-radial type is closed, which can prevent all non-single-radial type first busbars from being supplied with power. The load on the line is transferred to the un-de-energized opposite line connected by the tie switch of the second string power supply; then, at the physical level, the low-voltage side switch of the transformer connected to the first busbar is disconnected to achieve physical isolation and prevent reverse power supply to the transformer; next, since the first busbar, which does not have a second string power supply and a bus string power supply, cannot carry charge, the outgoing switch connected to the first busbar, which does not have a second string power supply and a bus string power supply, is disconnected to get rid of the load; finally, the tie switch connected between the bus string power supply and the first busbar, which belongs to the single-radial type, is closed to realize series power supply to the busbars of the remaining single-radial lines.

[0037] For example, an operation ticket is prepared for each step in the above embodiments. Then, after the operation ticket is manually verified to be correct, it is executed in the order of the operation ticket to realize the transfer of the first busbar to the target series power source according to the undervoltage state. At this time, the load situation of all sections is calculated based on the three-phase telemetry current information collected by the first busbar, the second series power source, and each switch of the busbar power source before and after the operation. Then, the total load of the transferred section is calculated according to the line topology after the transfer. Finally, the transfer-out and transfer-in loads of each distribution line and substation are obtained. Based on this, the transfer scheme display information is generated and recorded in the database.

[0038] In some embodiments, after the first busbar is switched to the target series power supply source according to the undervoltage state, the substation power outage self-healing method further includes: The low-voltage side switch of the transformer associated with the first busbar is closed; Disconnect the outgoing switch connecting the bus string power supply and the first bus, which is of the single-radial type; The circuit breaker is closed for the outgoing switch of the first busbar, which is a non-single-radial type, and the connection switch between the second power supply and the first busbar, which is a non-single-radial type, is disconnected.

[0039] For example, the low-voltage side switch of the transformer associated with the first busbar is closed, and the circuit is closed in a loop to prevent the line from losing power again when the power supply is restored. All single-radial lines are then powered by the transformer. Then, the outgoing switch associated with the bus string power supply and the first busbar of the single-radial type is disconnected, the power supply of the bus string is released, and the bus string power supply line returns to its original operation mode. For other non-single-radial lines, the outgoing switch of the first busbar of the non-single-radial line type is closed, and the tie switch between the second string power supply and the first busbar of the non-single-radial type is disconnected, restoring the original operation mode while maintaining power supply.

[0040] For example, after the fault handling is completed, the operation to restore the first busbar may include, but is not limited to, the following steps: (a) The following is a procedure for restoring the first busbar (non-single-radial type): If the bus string power supply line allows loop closing, first prepare a low-voltage switch closing operation ticket for the transformer to ensure that the first bus of the single-radial line can receive power from the high-voltage side, preventing instantaneous overload when closing non-single-radial lines. Then, prepare an operation ticket for the tie switch associated with the bus string power supply line to release the loop and restore the original power supply mode of the bus string power supply line. Based on the saved topology status before the transfer of non-single-radial type first bus (restoring the original operation mode) or standard topology status (restoring the standard operation mode), prepare operation tickets for restoring each non-single-radial type first bus after transfer. Then, sort the operation tickets according to whether the single-radial type first bus allows loop closing. Specifically, for single-radial type first buses that allow loop closing, close the switch first and then open it to ensure that the single-radial type first bus does not lose power. For single-radial type first buses that do not allow loop closing, open the switch first and then close it to prevent reverse power supply.

[0041] (ii) Prepare an operation ticket for the interconnection switch between the second power supply and the first busbar of the non-single-radial type.

[0042] (iii) After the dispatching personnel manually confirm that the operation ticket generated in the above steps is correct, they shall execute it with one click and issue the operation ticket in the manner of concurrent execution of external switches, sequential execution of internal switches, or forced sequential execution of all switches to complete the recovery operation.

[0043] (iv) After the transfer is completed, record the execution status of the operation ticket and save the recovery operation execution information to the database.

[0044] In some embodiments, this application provides a power outage self-healing device for substations, applied to a distribution automation master station system. The power outage self-healing device for substations includes: The data acquisition module is used to collect real-time three-phase telemetry current, three-phase telemetry phase voltage, and line voltage of the busbars of the substations associated with the distribution automation master station system. The first calculation module is used to determine the first busbar that is in the undervoltage state based on the line topology status, three-phase telemetry current, three-phase telemetry phase voltage, line voltage and jump threshold of the substation. The second calculation module is used to determine the target series power source corresponding to the first bus based on the remote control authority and automation configuration of the tie switch associated with the first bus, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority level. The power transfer module is used to transfer power from the first bus to the target series power source according to the power loss status.

[0045] For example, the specific implementation of the substation power failure self-healing device in this application embodiment is basically the same as the specific implementation of the substation power failure self-healing method described above, and will not be repeated here.

[0046] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned substation power failure self-healing method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.

[0047] Please see Figure 2 , Figure 2 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 201 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 202 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 202 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 202 and is called and executed by the processor 201 to execute the substation power failure self-healing method of the embodiments of this application. Input / output interface 203 is used to implement information input and output; The communication interface 204 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 205 transmits information between various components of the device (e.g., processor 201, memory 202, input / output interface 203, and communication interface 204); The processor 201, memory 202, input / output interface 203 and communication interface 204 are connected to each other within the device via bus 205.

[0048] In some embodiments, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described substation power outage self-healing method.

[0049] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0050] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0051] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0052] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0053] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0054] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0056] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0057] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0059] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method for self-healing after a power outage in a substation, characterized in that, The power outage self-healing method for substations, applied to a distribution automation master station system, includes: The system collects real-time three-phase telemetry current, three-phase telemetry phase voltage, and line voltage of the busbars of the substations associated with the distribution automation master station system. The first busbar in the undervoltage state is determined based on the line topology state corresponding to the substation, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the jump threshold. The target power supply source corresponding to the first bus is determined based on the remote control authority and automation configuration of the tie switch associated with the first bus, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority. Based on the described undervoltage state, the first bus is switched to the target series power source.

2. The substation power failure self-healing method according to claim 1, characterized in that, The step of determining the first busbar belonging to the undervoltage state based on the line topology state corresponding to the substation, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the jump threshold includes: Obtain voltage comparison data of the substations associated with the distribution automation master station system from the database of the distribution automation master station system; The voltage comparison data is updated based on the three-phase telemetry phase voltage, the line voltage, and the jump threshold. Select a second bus from the bus that satisfies the condition that the three-phase telemetry phase voltage is greater than or equal to the switching threshold, and associate the second bus with the switching state; Based on the line topology, the switching state, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the threshold waiting time, the first bus belonging to the undervoltage state is selected from the second bus.

3. The substation power failure self-healing method according to claim 2, characterized in that, The voltage comparison data includes multiple first-phase voltages and second-phase voltages connected in sequence. The first acquisition time corresponding to the first-phase voltage is before the second acquisition time corresponding to the second-phase voltage. The voltage comparison data includes multiple first-phase voltages and second-phase voltages connected in sequence. The first acquisition time corresponding to the first-phase voltage is before the second acquisition time corresponding to the second-phase voltage. Updating the voltage comparison data based on the three-phase telemetry phase voltage, the line voltage, and the jump threshold includes: If the three-phase telemetry phase voltage or the line voltage is detected to be a step-down voltage, and any one of the three-phase telemetry phase voltage or the line voltage is greater than or equal to the switching threshold, the first phase voltage is updated based on the second phase voltage while the second phase voltage is updated based on the three-phase telemetry phase voltage, and the first voltage is updated based on the second voltage while the second voltage is updated based on the line voltage. Conversely, if both the three-phase telemetry phase voltage and the line voltage are less than the switching threshold, the second phase voltage is updated based on the three-phase telemetry phase voltage while keeping the first phase voltage and the line voltage unchanged, and the second voltage is updated based on the line voltage. If the three-phase telemetry phase voltage or the line voltage is detected to be a boost voltage, the first phase voltage and the second phase voltage are updated simultaneously based on the three-phase telemetry phase voltage, and the first voltage and the second voltage are updated simultaneously based on the line voltage. If the three-phase telemetry phase voltage and the line voltage do not change and the time threshold is met, the first phase voltage is updated based on the second phase voltage while the second phase voltage is updated based on the three-phase telemetry phase voltage, and the first voltage is updated based on the second voltage while the second voltage is updated based on the line voltage. The updated first phase voltage, the updated second phase voltage, the updated first voltage, and the updated second voltage are stored in the database.

4. The substation power failure self-healing method according to claim 2, characterized in that, After filtering out the first bus belonging to the undervoltage state from the second bus based on the line topology state, the switching state, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the threshold waiting time, the method further includes: The target substation to which the first busbar belongs is selected from the substations mentioned above; If all busbars of the target substation are detected to be in the undervoltage state, the undervoltage state of the substation and the entire substation is associated.

5. The substation power failure self-healing method according to claim 1, characterized in that, The step of determining the target power supply source corresponding to the first bus based on the remote control authority and automation configuration of the tie switch associated with the first bus, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority includes: The first power supply is determined based on the remote control authority and automation configuration of the first tie switch among the tie switches associated with the first busbar, which belongs to the non-single-radial type. The second source of the target source is determined by sorting the load rates corresponding to the first source in descending order, and combining the weight associated with the user level priority corresponding to the first source with the line transfer priority. The target string power source is determined based on the remote control authority, automation configuration, load rate, user level priority, and line transfer priority of the tie switch associated with the first busbar belonging to the single-radial type.

6. The substation power failure self-healing method according to claim 5, characterized in that, The step of transferring power from the first bus to the target series power source according to the undervoltage state includes: Mark the first busbar as de-energized and disconnect the bus tie switch associated with the first busbar; Disconnect the outgoing switch associated with the first busbar of the non-single-radial type, and close the tie switch between the second power supply and the first busbar of the non-single-radial type. Disconnect the low-voltage side switch of the transformer associated with the first busbar; Disconnect the outgoing switch associated with the first bus of the second string power source and the main string power source that is not available; The outgoing switch associated with the bus string power supply and the first bus, which is of the single-radial type, is closed.

7. The substation power failure self-healing method according to claim 5, characterized in that, After transferring the first bus to the target series power source according to the described undervoltage state, the process further includes: Close the low-voltage side switch of the transformer associated with the first busbar; Disconnect the outgoing switch associated with the power supply of the bus string and the first bus, which belongs to the single-radial type; The outgoing switch of the first busbar, which is of the non-single-radial type, is closed, and the tie switch between the second power supply and the first busbar of the non-single-radial type is disconnected.

8. A self-healing device for power failure in a substation, characterized in that, The power outage self-healing device for the substation, applied in a power distribution automation master station system, includes: The data acquisition module is used to collect real-time three-phase telemetry current, three-phase telemetry phase voltage, and line voltage of the busbars of the substations associated with the distribution automation master station system. The first calculation module is used to determine the first busbar in the undervoltage state based on the line topology state corresponding to the substation, the three-phase telemetry current, the three-phase telemetry phase voltage, the line voltage, and the jump threshold. The second calculation module is used to determine the target series power supply source corresponding to the first bus based on the remote control authority and automation configuration of the tie switch associated with the first bus, the load rate of the opposite line associated with the tie switch, the user level priority of the opposite line, and the line transfer priority. A power transfer module is used to transfer power from the first bus to the target series power source according to the undervoltage state.

9. An electronic device, characterized in that, include: At least one processor; At least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the substation power failure self-healing method as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are used to execute the power outage self-healing method for any of the substations described in claims 1 to 7.

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