Power cut-off control method of power grid stability control system, power grid stability control system and device

Abstract

This application relates to the field of power system safety and stability control technology, and provides a power cut-off control method, power grid stability control system, and equipment for a power grid stability control system. The method includes: obtaining the target cut-off amount for the current power cut-off task; if the current power cut-off task is not the first power cut-off task in the current control cycle, determining a corrected cut-off amount based on the target cut-off amount and historical over-cutting errors; the historical over-cutting error is the over-cutting error generated by a previous power cut-off task belonging to the same control type and the same control cycle as the current power cut-off task; controlling the target execution station to perform the power cut-off operation according to the corrected cut-off amount, and determining the actual cut-off amount of the current power cut-off task after the power cut-off operation; updating the historical over-cutting error based on the actual cut-off amount and the corrected cut-off amount. This application can improve the accuracy of power cut-off, avoid power resource waste and reserve capacity loss, and ensure the safe and stable operation of the power grid.

Description

Technical Field

[0001] This application belongs to the field of power system safety and stability control technology, and in particular relates to a power cut-off control method, power grid stability control system and equipment for a power grid stability control system. Background Technology

[0002] With the development of power grid safety and stability control technology, the stability control system has become the second line of defense to ensure the safe and stable operation of the power grid. When the power grid is subjected to large disturbances, the stability control system maintains the power balance and frequency stability of the system by executing power cut-off control.

[0003] Existing power control systems typically employ a crude power cut-off logic based on offline settings or local independent decision-making to complete the power cut-off operation.

[0004] However, existing power control systems suffer from over-cutting during each power cut-off. When multiple rounds of policy actions occur, the over-cutting amount becomes even larger, resulting in wasted power resources and loss of reserve capacity, thus affecting the safe and stable operation of the power grid. Summary of the Invention

[0005] This application provides a power cut-off control method, power grid stability control system and equipment for a power grid stability control system, which can improve the accuracy of power cut-off, avoid power resource waste and reserve capacity loss, and ensure the safe and stable operation of the power grid.

[0006] In a first aspect, embodiments of this application provide a power cut-off control method for a power grid stability control system, applied to the execution control node of the power grid stability control system. The power cut-off control method for the power grid stability control system includes: Obtain the target cut-off amount for the current power cut-off task; If the current power cut-off task is not the first power cut-off task in this control cycle, the corrected cut-off amount is determined based on the target cut-off amount and the historical overcutting error; the historical overcutting error is the overcutting error generated by the previous power cut-off task that belongs to the same control type and the same control cycle as the current power cut-off task. According to the target of the corrected cut-off amount control, the execution station performs the power cut-off operation and determines the actual cut-off amount of the current power cut-off task after the power cut-off operation; The historical overcutting error is updated based on the actual resection volume and the corrected resection volume.

[0007] In one possible implementation of the first aspect, controlling the target execution station to perform a power cut-off operation according to the modified cut-off amount, and determining the actual cut-off amount of the current power cut-off task after the power cut-off operation, includes: selecting target cut-off objects from candidate power cut-off objects based on the modified cut-off amount; controlling the target execution station to perform a power cut-off operation on the target cut-off objects; summing the power of the target cut-off objects that actually completed the power cut-off operation to determine the actual cut-off amount of the current power cut-off task after the power cut-off operation.

[0008] In one possible implementation of the first aspect, selecting target cut-off objects from candidate power cut-off objects based on the modified cut-off amount includes: sorting the candidate power cut-off objects according to a preset sorting rule; determining the top (N-1) candidate power cut-off objects based on the power of the sorted candidate power cut-off objects to obtain the first part of target cut-off objects; wherein the cumulative power of the top N candidate power cut-off objects is greater than or equal to the modified cut-off amount, and the cumulative power of the top (N-1) candidate power cut-off objects is less than the modified cut-off amount; Among the candidate power cut-off objects other than the first part of the target cut-off objects, the candidate power cut-off objects that meet the minimum overcutting condition are selected as the second part of the target cut-off objects. The minimum overcutting condition includes: the sum of the cumulative power of the first part of the target cut-off objects and the power of the second part of the target cut-off objects is not less than the corrected cut-off amount and the difference between the sum of the power and the corrected cut-off amount is the smallest. The target cut-off objects are determined based on the first part of the target cut-off objects and the second part of the target cut-off objects.

[0009] In one possible implementation of the first aspect, the execution control node is determined according to the control type corresponding to the current power cut-off task; wherein, when the control type is the new energy cut-off type, the execution control node is the new energy execution station in the power grid stability control system, and the target execution station is the new energy execution station itself; when the control type is the generator cut-off type or the load cut-off type, the execution control node is the substation in the power grid stability control system, and the target execution station is the generator cut-off execution station or the load cut-off execution station in the power grid stability control system.

[0010] In one possible implementation of the first aspect, the power cut-off control method of the power grid stability control system further includes: when the current power cut-off task is the first power cut-off task of the current control cycle, determining the corrected cut-off amount based on the target cut-off amount and the preset initial value.

[0011] Secondly, embodiments of this application provide a power cut-off control method for a power grid stability control system, applied to the master station of the power grid stability control system. The power cut-off control method for the power grid stability control system includes: The target power cut-off amount for the current power cut-off task is determined based on the type of fault in the power grid. The target cutoff amount is sent to the execution control node of the power grid stability control system; the execution control node is used to execute the power cutoff control method of the power grid stability control system in any of the first aspects.

[0012] In one possible implementation of the second aspect, when the fault type is a double-circuit line trip causing section overload fault, the target power cut-off amount for the current power cut-off task is determined according to the fault type of the power grid, including: determining the power deviation based on the real-time power of the section and the preset section power setting; determining the initial required cut-off amount based on the power deviation, the preset generator tripping coefficient, and the preset power imbalance setting; obtaining the total amount of available renewable energy; when the total amount of available renewable energy is not less than the initial required cut-off amount, the initial required cut-off amount is determined as the target cut-off amount for the renewable energy type; when the total amount of available renewable energy is less than the initial required cut-off amount, the total amount of available renewable energy is determined as the target cut-off amount for the renewable energy type, and the target cut-off amount for the generator tripping type is determined based on the initial required cut-off amount and the total amount of available renewable energy.

[0013] In one possible implementation of the second aspect, when the fault type is a main transformer overload fault, the target amount of the current power cut-off task is determined according to the fault type of the power grid, including: receiving the overload amount sent by the substation in the power grid stability control system; when the overload amount exceeds the preset overload start-up value, the target amount of the load shedding type is determined according to the overload amount.

[0014] Thirdly, embodiments of this application provide a power cut-off control device for a power grid stability control system, configured at the execution control node of the power grid stability control system, the power cut-off control device for the power grid stability control system comprising: The power cut-off quantity acquisition module is used to obtain the target cut-off quantity for the current power cut-off task; The correction module is used to determine the corrected cutoff amount based on the target cutoff amount and the historical overcutting error when the current power cutoff task is a non-first power cutoff task in the current control cycle. The historical overcutting error is the overcutting error generated by the previous power cutoff task that belongs to the same control type and the same control cycle as the current power cutoff task. The actual cut-off amount determination module is used to control the target execution station to perform power cut-off operations according to the corrected cut-off amount, and to determine the actual cut-off amount of the current power cut-off task after the power cut-off operation; The update module is used to update historical overcutting errors based on the actual resection amount and the corrected resection amount.

[0015] Fourthly, embodiments of this application provide a power cut-off control device for a power grid stability control system, configured at the master station of the power grid stability control system. The power cut-off control device includes: The power cut-off quantity determination module is used to determine the target power cut-off quantity for the current power cut-off task based on the fault type of the power grid. The sending module is used to send the target cutoff amount to the execution control node of the power grid stability control system; the execution control node is used to execute the power cutoff control method of the power grid stability control system in any of the first aspects.

[0016] Fifthly, embodiments of this application provide a power grid stabilization system, including: Execution control node and master station; Establish communication connections between the control node and the master station; The execution control node is used to execute the power cut-off control method of the power grid stability control system in any of the first aspects; The power cut-off control method of the power grid stabilization system used by the main station to execute any one of the second aspects.

[0017] In a sixth aspect, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the power cut-off control method of the power grid stabilization system according to any of the first aspects, or implements the power cut-off control method of the power grid stabilization system according to any of the second aspects.

[0018] In a seventh aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power cut-off control method of the power grid stabilization system according to any one of the first aspects, or implements the power cut-off control method of the power grid stabilization system according to any one of the second aspects.

[0019] Eighthly, embodiments of this application provide a computer program product that, when run on a computer device, causes the computer device to execute the power cut-off control method of the power grid stabilization system according to any of the first aspects, or to implement the power cut-off control method of the power grid stabilization system according to any of the second aspects.

[0020] The beneficial effects of the embodiments in this application compared with the prior art are: This application provides a power cut-off control method, system, and device for a power grid stabilization system. The method involves obtaining the target cut-off amount for the current power cut-off task and determining a corrected cut-off amount based on historical over-cutting errors. Since the historical over-cutting error is the over-cutting error generated by a previous task within the same control cycle and of the same control type as the current power cut-off task, when determining the corrected cut-off amount based on the target cut-off amount and historical over-cutting errors, the corrected cut-off amount deducts the over-cutting error of the previous power cut-off task. Because the historical over-cutting error is limited to that generated by a previous power cut-off task of the same control type within the same control cycle, error interference between power cut-off tasks of different control types or different control cycles is avoided. This ensures that the corrected cut-off amount accurately reflects the actual power to be cut off after considering previous over-cutting situations, thereby enabling the actual cut-off amount determined after performing the power cut-off operation according to the corrected cut-off amount to compensate for the previously over-cut portion. Furthermore, since this application updates historical over-cutting errors based on actual and corrected cut-off amounts, and these historical over-cutting errors can be used for the next power cut-off task of the same control type, a closed-loop mechanism for error propagation and correction is formed. That is, through the cooperation of the above steps, each power cut-off task takes into account the over-cutting amount of previous power cut-off tasks of the same control type, ensuring that the actual cut-off amount in each round approximates the total cut-off amount at the cumulative level, avoiding the accumulation of over-cutting amounts during multiple rounds of strategy actions. Therefore, this application can improve the accuracy of power cut-off, avoid power resource waste and reserve capacity loss, and ensure the safe and stable operation of the power grid. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a specific power grid stabilization system provided in an embodiment of this application; Figure 2 This is a schematic flowchart of a power cut-off control method for a power grid stabilization system applied to an execution control node, provided in an embodiment of this application. Figure 3 This is a schematic diagram of the process for determining the actual amount of resection provided in the embodiments of this application; Figure 4 This is a schematic diagram of the process for filtering target objects provided in an embodiment of this application; Figure 5This is a flowchart illustrating the process of determining the target cut-off amount when a double-circuit line trip causes a section overload fault, as provided in an embodiment of this application. Figure 6 This is a schematic diagram of the process of switching new energy sources in the State Grid's standardized three-layer architecture stability control system, based on the power cut-off control method using a negative feedback model provided in the embodiments of this application. Figure 7 This is a schematic diagram of the negative feedback model provided in the embodiments of this application; Figure 8 This is a schematic diagram of the power cut-off control method based on the negative feedback model provided in the embodiment of this application, applied to the State Grid's standardized three-layer architecture stability control system. Figure 9 This is a schematic diagram of the load shedding process of the power shedding control method based on the negative feedback model provided in the embodiment of this application in the State Grid standardized three-layer architecture stability control system; Figure 10 This is a schematic diagram of the structure of a power cut-off control device configured in an execution control node of a power grid stabilization system according to an embodiment of this application; Figure 11 This is a schematic diagram of the structure of a power cut-off control device configured in a power grid stabilization system at the main station, as provided in an embodiment of this application. Figure 12 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0023] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0024] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0025] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0027] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] Existing power control systems typically employ a crude power cut-off logic based on offline settings or local independent decision-making to complete the power cut-off operation.

[0030] However, existing power control systems suffer from over-cutting during each power cut-off. When multiple rounds of policy actions occur, the over-cutting amount becomes even larger, resulting in wasted power resources and loss of reserve capacity, thus affecting the safe and stable operation of the power grid.

[0031] To overcome the aforementioned technical deficiencies, embodiments of this application provide a power cut-off control method, a power grid stability control system, and equipment for a power grid stability control system. This method improves the accuracy of power cut-off, avoids power resource waste and reserve capacity loss, and ensures the safe and stable operation of the power grid. The power cut-off control method can be applied to a power grid stability control system, which includes an execution control node and a master station. The execution control node and the master station are connected by communication. The execution control node is the device in the stability control system responsible for executing the specific power cut-off control logic. In different application scenarios, the execution control node has different physical implementations: in generator cut-off and load cut-off scenarios, the execution control node is a stability control substation; in renewable energy cut-off scenarios, the execution control node is a renewable energy execution station. The master station is the strategy decision-making layer device at the top of the three-layer architecture in the power grid stability control system. It is responsible for summarizing information from lower-level stations, identifying the power grid operating mode, judging faults in real time based on a customized strategy table, and calculating measures. By coordinating the execution control nodes and the master station, a complete closed-loop control process can be achieved, from fault diagnosis and target cutoff calculation to correction cutoff determination, power cutoff operation execution, actual cutoff determination, and overcutting error update, thereby improving the accuracy of power cutoff.

[0032] like Figure 1 The diagram illustrates a specific power grid stability control system, which can be a State Grid standardized three-tier architecture stability control system, including a three-tier master station, substations, renewable energy execution stations, generator tripping execution stations, and load shedding execution stations. The bottom-tier execution stations (renewable energy execution stations, generator tripping execution stations, and load shedding execution stations) are used for component information collection, data transmission, and execution of commands from higher levels. The middle-tier substations act as information transmission links, receiving and aggregating information from various execution stations, transmitting it to the three-tier master station, receiving tripping commands from the master station, calculating and allocating the tripping amount to each execution station. The upper-tier three-tier master station acts as the strategy decision-making layer, aggregating information such as component on / off status, transmission section power, controllable quantities, and component faults from lower-level stations, monitoring section power, identifying power grid operation modes, judging faults in real time based on customized strategy tables, rapidly driving strategies and calculating measures, and issuing measures to the substations. The renewable energy execution station refers to a device that collects information on renewable energy lines or main transformers, calculates the renewable energy tripping capacity and transmits it to the substations, and receives renewable energy tripping commands from the substations. A generator tripping execution station is a device that collects generator information, transmits the output and information of each generator to the substation, and receives generator tripping commands from the substation to execute generator tripping. A load shedding execution station is a device that collects load line information, calculates the load shedding capacity for each priority level and transmits it to the substation, and receives load shedding round commands from the substation to execute load line shedding.

[0033] In one exemplary embodiment, such as Figure 2As shown, a power cut-off control method for a power grid stability control system is provided. The method is illustrated using an execution control node in the power grid stability control system as an example. Here, the execution control node refers to the device in the stability control system responsible for executing the specific power cut-off control logic. In different application scenarios, the execution control node has different physical implementations: in generator tripping and load tripping scenarios, the execution control node is... Figure 1 The substation in the middle; in the new energy scenario, the execution control node is Figure 1 The power cut-off control method of the power grid stabilization system includes the following steps: (This refers to the new energy execution station in the system.) S201, obtain the target cut-off amount for the current power cut-off task.

[0034] The current power cut-off task refers to a single control task that the execution control node is currently processing and that requires a power cut-off operation. This current power cut-off task has a clear cut-off target and execution cycle, and is the basic execution unit of the power cut-off control method.

[0035] Each time the power grid stability control system triggers a strategy action, it generates a power cut-off task. This power cut-off task starts by obtaining the target cut-off amount, goes through the process of correcting the cut-off amount determination, executing the power cut-off operation, determining the actual cut-off amount, and updating the overcutting error, until the overcutting error update is completed, at which point the power cut-off task ends.

[0036] The target cutoff amount refers to the power value that the current power cutoff task needs to cutoff. It can be calculated by the master station based on the policy setting or by the execution control node based on the local policy setting.

[0037] As one feasible approach, the execution control node receives the target power cut-off amount for the current power cut-off task from the master station. The master station can determine the target cut-off amount based on the real-time power of the grid interruption detection element and preset thresholds corresponding to different control strategies, and then send it to the execution control node. The execution control node receives the target cut-off amount and stores it in its local memory for subsequent calculations. When the execution control node is a new energy execution station, the substation forwards the received target cut-off amount from the master station to the new energy execution station.

[0038] As another possible approach, the execution control node can also calculate the target power cut-off amount itself based on a locally stored policy setting table. When the execution control node detects that the policy activation conditions are met, it triggers the current power cut-off task and calculates the target power cut-off amount based on the settings in the locally stored policy setting table that match the current operating mode and fault type in the current power cut-off task. The policy activation conditions include at least one of the following: detecting a sudden change in component current exceeding the activation setting value; detecting a sudden change in component voltage exceeding the activation setting value; detecting a change in component switch position; or detecting a component power exceeding the overload activation setting value.

[0039] S202, if the current power cut-off task is a non-first power cut-off task in this control cycle, determine the corrected cut-off amount based on the target cut-off amount and historical overcutting error.

[0040] The control cycle refers to the time interval of continuous control actions triggered by the same fault event or the same strategy activation condition. This control cycle begins when the strategy activation condition is detected (e.g., component fault tripping, power overload, or current surge exceeding the activation setpoint) and ends when all control measures corresponding to the fault event are executed or the strategy activation condition resets. Within the same control cycle, there may be multiple power cut-off tasks of the same type (i.e., the same control type) or different types (i.e., different control types). Control types include generator cut-off, renewable energy cut-off, and load cut-off.

[0041] A non-initial power cut-off task refers to a subsequent power cut-off task triggered again within the current control cycle for the same control type, after a previous power cut-off task has been completed. Conversely, an initial power cut-off task is the first power cut-off task under that control type within the current control cycle.

[0042] Historical over-cutting error refers to the over-cutting error generated by a previous power cut-off task that belongs to the same control type and control cycle as the current power cut-off task. Over-cutting error is the difference between the actual cut-off amount and the corrected cut-off amount after the power cut-off operation is performed.

[0043] The execution control node determines whether the current power cut-off task is the first power cut-off task within the current control cycle. If the current power cut-off task is not the first power cut-off task within the current control cycle, the execution control node reads the overcutting error generated by the previous power cut-off task of the same control type as the current power cut-off task from local memory as the historical overcutting error. The execution control node subtracts the historical overcutting error from the target cut-off amount to obtain the corrected cut-off amount.

[0044] As an optional implementation, if the current power cut-off task is the first power cut-off task of this control cycle, the corrected cut-off amount is determined based on the target cut-off amount and the preset initial value.

[0045] The preset initial value refers to the default value set by the execution control node for historical over-cutting errors before the start of the control cycle or before the first power cut-off task is executed. This default value is used as the initial value for calculating the corrected cut-off amount when there is no over-cutting error generated by the previous power cut-off task. The preset initial value can be zero, indicating that no correction is made to the target cut-off amount when there is no historical over-cutting error to refer to; that is, the corrected cut-off amount is equal to the target cut-off amount.

[0046] When the execution control node determines that the current power cut-off task is the first power cut-off task within the current control cycle, it can read a preset initial value, such as zero. Subtracting zero from the target cut-off amount yields the corrected cut-off amount, meaning the corrected cut-off amount equals the target cut-off amount. The first power cut-off task is then executed normally according to the original required cut-off amount.

[0047] By determining the corrected cutoff amount based on the target cutoff amount and the preset initial value during the first power cutoff task in the current control cycle, the first power cutoff task is executed normally according to the target cutoff amount, avoiding the problem of not being able to determine the historical overcutting error due to the absence of a previous task.

[0048] S203, the power cut-off operation is performed by the execution station according to the target of the corrected cut-off amount control, and the actual cut-off amount of the current power cut-off task is determined after the power cut-off operation.

[0049] In this context, the target execution station refers to the plant-level device controlled by the execution control node that specifically performs power cut-off operations. When the execution control node is a substation, the target execution station is the generator cut-off execution station or load cut-off execution station subordinate to the substation; when the execution control node is a renewable energy execution station, the target execution station is the renewable energy execution station itself. The target execution station is responsible for receiving the cut-off command issued by the execution control node and carrying out physical cut-off operations on the generator units, renewable energy lines, or load lines within its jurisdiction.

[0050] Actual cut-off amount refers to the total power of the objects that were actually cut off after the power cut-off operation was completed.

[0051] As one feasible approach, when the execution control node is a new energy execution station, the new energy execution station can sort the candidate power cut-off objects according to a certain sorting rule based on the corrected cut-off amount. Starting from the first candidate power cut-off object in the sorting, the power is accumulated one by one until the accumulated power first reaches or exceeds the corrected cut-off amount. All candidate power cut-off objects participating in the accumulation are then identified as target cut-off objects, and a trip command is issued to the target cut-off objects to execute the power cut-off operation. The new energy execution station detects whether the circuit breaker corresponding to each target cut-off object has actually completed the tripping, and sums the power of the target cut-off objects that have actually completed the tripping to obtain the actual cut-off amount.

[0052] As another feasible approach, when the execution control node is a substation, the substation determines the corresponding cutoff amount for each target execution station based on the corrected cutoff amount, and issues cutoff commands to the target execution stations to control them to perform power cutoff operations. The substation receives the cutoff result information sent by each target execution station, sums the power of the objects that were actually cut off by each target execution station, and obtains the actual cutoff amount.

[0053] S204 updates the historical overcutting error based on the actual resection amount and the corrected resection amount.

[0054] Updating historical overcutting error means storing the difference between the actual resection amount and the corrected resection amount as the new overcutting error.

[0055] After the execution control node determines the actual cutoff amount, it updates the historical overcutting error based on the actual cutoff amount and the corrected cutoff amount, so as to correct the cutoff amount for the next power cutoff task that belongs to the same control type as the current power cutoff task within the control cycle.

[0056] As a specific implementation, the execution control node calculates the difference between the actual cutoff amount and the corrected cutoff amount to obtain the overcutting error of the current power cutoff task. The execution control node stores this overcutting error in the local memory storage area corresponding to the current control type, overwriting previously stored historical overcutting errors. When the next power cutoff task of the same control type occurs within the same control cycle, the execution control node reads the updated overcutting error from this storage area as a historical overcutting error to participate in the calculation of the corrected cutoff amount.

[0057] As an optional implementation, after calculating the difference between the actual power cut-off amount and the corrected power cut-off amount, the execution control node can also determine whether the difference exceeds a preset error threshold. If the difference does not exceed the preset error threshold, the execution control node stores the difference as the updated historical over-cutting error; if the difference exceeds the preset error threshold, the execution control node issues an alarm signal and stops the subsequent power cut-off tasks of the control cycle to ensure grid safety.

[0058] As an alternative implementation, the execution control node is determined based on the control type corresponding to the current power cut-off task. Specifically, when the control type is renewable energy cut-off, the execution control node is the renewable energy execution station in the power grid stability control system, and the target execution station is the renewable energy execution station itself. When the control type is generator cut-off or load cut-off, the execution control node is a substation in the power grid stability control system, and the target execution station is either the generator cut-off execution station or the load cut-off execution station in the power grid stability control system.

[0059] One possible approach is for the execution control node, upon receiving a current power cut-off task, to read the control type identifier carried in the task. If the control type identifier is for a new energy type, the execution control node is the new energy execution station, and the target execution station is the new energy execution station itself; if the control type identifier is for a generator tripping type, the execution control node is a substation, and the target execution station is the generator tripping execution station; if the control type identifier is for a load shedding type, the execution control node is a substation, and the target execution station is the load shedding execution station.

[0060] Another possible approach is for the execution control node to determine the control type based on the source of the current power cut-off task. If the current power cut-off task originates from a new energy capacity cut-off command issued by the master station, the execution control node determines the control type as new energy cut-off; if the current power cut-off task originates from a generator capacity cut-off command issued by the master station, the execution control node determines the control type as generator cut-off; and if the current power cut-off task originates from a load capacity cut-off command issued by the master station, the execution control node determines the control type as load cut-off. Thus, the execution control node and the corresponding target execution station are determined according to the above implementation method.

[0061] As a specific implementation method, when switching to renewable energy, the master station issues the cut-off capacity (i.e., the target cut-off amount) to the substations, and the substations then issue the cut-off capacity to the renewable energy execution stations. In this process, over-cutting only occurs when the renewable energy station executes the cut-off measures. Therefore, selecting the renewable energy execution station as the execution measure controller (i.e., the execution control node) is more suitable. When switching to a generator, the master station issues the generator cut-off capacity (i.e., the target cut-off amount) to the substations. The substations directly search for the generators to be cut off, which can cause over-cutting at the substation level. Therefore, selecting the substations as the execution measure controller is more suitable. When switching to a load, the master station issues the load switching capacity (i.e., the target cut-off amount) to the substations. The substations directly search for the available load for each load execution station in each round, which can cause over-cutting at the substation level. Therefore, selecting the substations as the execution measure controller is more suitable.

[0062] By determining the specific physical implementation of the execution control node and the target execution station according to the control type, the method in this embodiment can flexibly adapt to three different scenarios: switching to new energy sources, switching to generators, and switching to loads, and has good versatility and adaptability.

[0063] The above embodiments obtain the target cutoff amount for the current power cutoff task and determine the corrected cutoff amount by combining it with historical overcutting errors. Since the historical overcutting error is the overcutting error generated by a previous task of the same control type and within the same control cycle when the current power cutoff task is not the first power cutoff task in the current control cycle, the corrected cutoff amount deducts the overcutting error of the previous power cutoff task when determining the corrected cutoff amount based on the target cutoff amount and historical overcutting errors. Because the historical overcutting error is limited to that generated by a previous power cutoff task of the same control type within the same control cycle, error interference between power cutoff tasks of different control types or different control cycles is avoided. This ensures that the corrected cutoff amount accurately reflects the actual cutoff power value of the current power cutoff task after considering previous overcutting situations, thereby enabling the actual cutoff amount determined after performing the power cutoff operation according to the corrected cutoff amount to compensate for the previously overcut portion. Furthermore, since this application also updates the historical overcutting error based on the actual cutoff amount and the corrected cutoff amount, and this historical overcutting error can be used for the next power cutoff task of the same control type, a closed-loop mechanism for error propagation and correction is formed. In other words, through the coordination of the above steps, each power cut-off task takes into account the over-cutting amount of previous power cut-off tasks of the same control type during execution, so that the actual cut-off amount in each round approaches the total cut-off amount at the cumulative level, avoiding the accumulation of over-cutting amounts when the strategy is implemented in multiple rounds. Therefore, this embodiment can improve the accuracy of power cut-off, avoid the waste of power resources and the loss of reserve capacity, and ensure the safe and stable operation of the power grid.

[0064] Based on the above embodiments, in an exemplary embodiment, such as Figure 3 As shown, the process of determining the actual amount of resection in step S203 above includes: S301, Based on the corrected resection amount, select the target resection object from the candidate power resection objects.

[0065] Among them, the candidate power cut-off targets refer to the candidate targets that can be used for power cut-off within the jurisdiction of the current execution control node, including generator sets, new energy lines, main transformers or load lines.

[0066] The target to be cut off refers to the object that actually needs to be cut off in this power cut-off operation as determined by the execution control node.

[0067] One possible approach is for the execution control node to sort candidate power cut-off objects according to a preset priority, starting with the candidate power cut-off object at the top of the sort, and then add each candidate power cut-off object into the target cut-off set one by one, and accumulate the total power of the target cut-off set until the accumulated total power of the target cut-off set first reaches or exceeds the modified cut-off amount, and then determine all candidate power cut-off objects in the target cut-off set as target cut-off objects.

[0068] Another possible approach is for the execution control node to filter candidates based on their operational status, excluding those under maintenance, in a fault state, or that do not meet the cutoff conditions, and only including those that meet the cutoff conditions. The cutoff conditions include the device being operational, the absence of other abnormalities, and the activation of the cutoff pressure plate.

[0069] S302, control the target execution station to perform a power cut-off operation on the target cut-off object.

[0070] One feasible approach is to assign multiple target execution objects in a power cutoff task to different target execution stations. When the execution control node is a substation, the substation identifies the target execution station to which each target execution object belongs and divides the target execution objects into several object groups according to the affiliation of the target execution stations. Each object group corresponds to one target execution station. After the division, the substation issues cutoff commands to each target execution station, with each cutoff command carrying the identification information of each target execution object in the object group corresponding to that target execution station. After receiving the cutoff command, each target execution station performs power cutoff operations on the corresponding target execution objects within its jurisdiction based on the object identifiers in the cutoff command. In this way, the substation achieves parallel control of multiple target execution stations, completing the execution of the entire power cutoff task.

[0071] Another possible approach is that, when the execution control node is a new energy execution station, the new energy execution station issues a trip command to the circuit breaker corresponding to the target to be cut off, and performs a power cut-off operation. The new energy execution station outputs a trip pulse signal to the trip coil of the circuit breaker through the operation circuit, triggering the circuit breaker to open.

[0072] S303, sum the power of the target objects that have actually completed the power cut-off operation, and determine the actual cut-off amount of the current power cut-off task after the power cut-off operation.

[0073] One feasible approach is for the execution control node to determine whether each target power cut-off object has actually completed power cut-off by detecting the actual position status of the circuit breaker corresponding to each target power cut-off object. The execution control node then sums up the power of the target power cut-off objects that have actually completed power cut-off to obtain the actual power cut-off amount corresponding to the current power cut-off task.

[0074] Another possible approach is to execute the control node by issuing a trip command to the target disconnection object, and then, after a preset waiting time (e.g., 20 to 100 milliseconds), read the position status signal of the circuit breaker corresponding to each target disconnection object. If the circuit breaker's position status signal shows the open position, it is determined that the target disconnection object has actually completed power disconnection; if the circuit breaker's position status signal shows the closed position, it is determined that the target disconnection object has not actually completed power disconnection. The control node then sums up the power of each target disconnection object that has been determined to have actually completed power disconnection to obtain the actual disconnection amount.

[0075] In this embodiment, the target resection object is screened based on the corrected resection amount, and the actual resection amount is determined by summing the power of the target resection objects that actually completed the power resection operation. This ensures that the actual resection amount is calculated based on physical facts (the actual power resected) rather than on theoretical command values, thus providing a real data foundation for the accuracy of the negative feedback model.

[0076] Based on the above embodiments, in an exemplary embodiment, considering that the method of calculating the required cut-off quantity according to the strategy formula and cutting off components sequentially according to priority values, overcutting will inevitably occur at the last component. Furthermore, the stability control system has a timeliness requirement for fault handling; for example, the system action delay must be less than 20ms. Therefore, the algorithm used in the stability control system cannot be too complex (firstly, excessive time complexity would delay the fault action removal time; secondly, the minimum overcutting algorithm inherently has a non-unique solution, which may lead to the system mistakenly cutting off more components).

[0077] To overcome the above-mentioned defects, this embodiment adopts an optimal overcutting method when searching for the component to be cut. The components are cut in order of capacity size, N-1 components are cut first, and the last component is the component with the smallest overcutting, thereby reducing the overcutting amount. Secondly, after overcutting occurs, the overcutting amount (i.e., overcutting error) is recorded. In the next operation within the cycle, the overcutting amount is compensated to achieve the purpose of accurate cutting.

[0078] Specifically, such as Figure 4 As shown, the process of screening the target to be removed in step S301 above includes: S401, sort the candidate power removal objects according to the preset sorting rules.

[0079] Among them, the preset sorting rule refers to the pre-set rule used to determine the order of removal of candidate power removal objects. The preset sorting rule may include sorting according to priority from high to low, sorting according to capacity from large to small, or sorting according to comprehensive weight.

[0080] One possible approach is for the execution control node to sort candidate power cut-off objects from highest to lowest priority. The priority values ​​are pre-configured in the execution control node's policy setting table, reflecting the priority order of each candidate power cut-off object during power cut-off.

[0081] Another possible approach is to sort the execution control nodes in descending order of the capacity of each candidate power cut-off object.

[0082] S402, based on the power of the sorted candidate power cut-off objects, determine the top (N-1) candidate power cut-off objects to obtain the first part of the target cut-off objects.

[0083] The first part of the target removal objects refers to the (N-1) candidate power removal objects that the execution control node determines from the sorted candidate power removal objects during the process of filtering target removal objects according to the modified removal amount.

[0084] The value of N satisfies the following condition: the cumulative power of the first N candidate power removal objects is greater than or equal to the corrected removal amount for the first time, while the cumulative power of the first (N-1) candidate power removal objects is less than the corrected removal amount.

[0085] One possible approach is for the execution control node to start with the candidate power removal object at the top of the sorted list and accumulate the power of each candidate power removal object one by one. When the accumulated power reaches or exceeds the corrected removal amount for the first time when the Nth candidate power removal object is accumulated, and the accumulated power of the (N-1) candidate power removal objects is less than the corrected removal amount, the execution control node determines the first (N-1) objects as the first part of the target removal objects.

[0086] For example, suppose the corrected cutoff amount is 75MW, and the candidate power cutoff targets, ranked by priority, have capacities of 30MW, 25MW, 40MW, and 20MW. The cumulative power of the top two targets is 55MW (less than 75MW), and the cumulative power of the top three targets is 95MW (greater than 75MW for the first time). Therefore, N=3, and the top N-1=2 targets, with capacities of 30MW and 25MW, constitute the first part of the target cutoff targets. Since the cumulative power of the first part of the target cutoff targets is 55MW, which does not yet reach the corrected cutoff amount of 75MW, a second part of the target cutoff targets (selected from the remaining targets to meet the minimum overcut condition) needs to be chosen to jointly satisfy the cutoff requirement.

[0087] S403, among the candidate power cut-off objects other than the first part of the target cut-off objects, select the candidate power cut-off object that satisfies the minimum overcutting condition as the second part of the target cut-off objects.

[0088] The minimum overcut condition includes: the sum of the cumulative power of the first part of the target resection object and the power of the second part of the target resection object is not less than the corrected resection amount and the difference between the sum of the power and the corrected resection amount is the smallest.

[0089] The execution control node calculates the sum of the power of each remaining candidate power cut-off object and the cumulative power of the first part of the target cut-off object from the remaining candidate power cut-off objects other than the first part of the target cut-off objects. The remaining candidate power cut-off object that minimizes the difference between the sum and the corrected cut-off amount is selected as the second part of the target cut-off objects.

[0090] S404, Determine the target resection object based on the first part of the target resection object and the second part of the target resection object.

[0091] The execution control node determines the target cut object as the union of the first part of the target cut object and the second part of the target cut object.

[0092] In this embodiment, by first determining the first part of the target cut-off objects, and then selecting the second part of the target cut-off objects that meet the minimum overcutting condition from the remaining candidate power cut-off objects, the total power of the finally determined target cut-off objects is minimized while satisfying that it is not less than the corrected cut-off amount. This achieves minimum overcutting, further improves the accuracy of power cut-off, and reduces the waste of power resources.

[0093] In an exemplary embodiment, a power cut-off control method for a power grid stability control system is provided. This method is applied to the master station of the power grid stability control system and includes the following steps: determining the target cut-off amount for the current power cut-off task based on the fault type of the power grid; sending the target cut-off amount to the execution control node of the power grid stability control system; and the execution control node executing the power cut-off control method of the power grid stability control system described in the above embodiment.

[0094] Among them, the master station refers to the strategy decision-making layer device located at the top of the three-layer architecture in the power grid stability control system. It is responsible for summarizing information from each lower-level station, identifying the power grid operation mode, judging faults in real time based on the customized strategy table, and calculating the amount of measures.

[0095] Fault type refers to the type of disturbance that occurs in the power grid and causes changes in the system's operating state, including cross-sectional overload faults caused by double-circuit line tripping, main transformer overload faults, line tripping faults, generator tripping faults, or bus faults, etc.

[0096] One feasible approach involves the master station monitoring the real-time power of the grid interruption detection element and comparing it with a preset power setpoint in the strategy setting table. When the real-time power exceeds the power setpoint, the master station calculates the target shedding amount based on the deviation between the real-time power and the power setpoint. Specifically, the master station calculates the difference between the real-time power and the power setpoint, multiplies the difference by a preset shedding coefficient or load shedding coefficient, and obtains the target shedding amount. The master station transmits the target shedding amount to the slave station via fiber optic communication, and the slave station forwards the target shedding amount to the execution control node via an inter-station communication interface.

[0097] Another feasible approach involves the master station simultaneously monitoring the real-time power and current of the cross-sectional detection element. The master station compares the real-time power with the power setpoint in the strategy setting table, and the real-time current with the current setpoint in the same table. When both the real-time power and current exceed their respective setpoints, the master station triggers the corresponding control strategy, calculating the target cut-off amount based on the deviation between the real-time power and the power setpoint. The master station then sends the target cut-off amount signal to the execution control node via hard-wiring. The master station converts the target cut-off amount into an analog or digital signal and transmits it to the execution control node via a dedicated control cable.

[0098] In this embodiment, the master station determines the target cutoff amount based on the fault type of the power grid and sends it to the execution control node. This enables the execution control node to obtain the accurate cutoff amount calculated by the master station based on global power grid information, providing an accurate benchmark for subsequent cutoff amount correction.

[0099] Based on the above embodiments, in an exemplary embodiment, such as Figure 5 As shown, when a double-circuit line trip causes a section overload fault, the process of determining the target cutoff quantity includes: S501, determine the power deviation based on the real-time power of the cross-section and the preset cross-section power setting.

[0100] Among them, the real-time power of the cross section refers to the sum of the power flowing through the cross section detection element in real time.

[0101] The preset cross-sectional power setpoint refers to the power threshold that is stored in advance in the strategy setpoint table and used to determine whether the cross-section is overloaded.

[0102] The power deviation refers to the difference between the real-time power of the cross section and the preset cross section power value.

[0103] The main station can collect and sum the power values ​​of each component in real time through the cross-section detection element to obtain the real-time cross-section power. Then, the preset cross-section power value is subtracted from the real-time cross-section power to obtain the power deviation.

[0104] S502 determines the initial required cut-off amount based on the power deviation, the preset cut-off coefficient, and the preset power imbalance value.

[0105] The preset cutting coefficient refers to the pre-set proportional coefficient used to convert the power deviation into the required cutting amount.

[0106] The preset power imbalance value refers to the pre-set power imbalance value used to correct the required power imbalance.

[0107] The master station can multiply the power deviation by the preset tripping coefficient and then subtract the preset power imbalance value to obtain the initial required tripping amount.

[0108] S503, obtain the total amount of available new energy sources.

[0109] The total amount of detachable renewable energy refers to the sum of the output of all renewable energy power plants that can be disconnected from the current power grid.

[0110] The main station can accumulate the total amount of scalable new energy by adding up the scalable quantity information sent by the new energy execution station.

[0111] S504, when the total amount of available new energy sources is not less than the initial required amount to be cut, the initial required amount to be cut is determined as the target amount to be cut for the new energy source type.

[0112] The main station compares the total available renewable energy source with the initial required renewable energy source. If the total available renewable energy source is greater than or equal to the initial required renewable energy source, the main station determines the initial required renewable energy source as the target amount to be removed.

[0113] S505, when the total amount of available new energy is less than the initial required amount, the total amount of available new energy is determined as the target amount to be cut off for the new energy type, and the target amount to be cut off for the cutting machine type is determined based on the initial required amount and the total amount of available new energy.

[0114] If the total amount of available new energy sources is less than the initial required amount, the main station will determine the total amount of available new energy sources as the target amount to be cut for the new energy source type, and the difference between the initial required amount and the total amount of available new energy sources will be determined as the target amount to be cut for the machine type.

[0115] In this embodiment, by prioritizing the switching of new energy sources and then switching conventional units when new energy sources are insufficient, the adjustability of new energy sources is fully utilized, unnecessary disconnection of conventional units is reduced, and the impact of power disconnection on system inertia is reduced.

[0116] Based on the above embodiments, in an exemplary embodiment, the process of determining the target shedding amount when the main transformer is overloaded includes: receiving the overload amount sent by the substation in the power grid stability control system; when the overload amount exceeds the preset overload start-up value, determining the target shedding amount of the load shedding type based on the overload amount.

[0117] Overload refers to the difference between the actual power of the main transformer and its rated capacity or preset limit. The substation collects the real-time power of the main transformer and compares it with the preset limit to calculate the overload and then sends it to the main station.

[0118] The preset overload start-up setpoint refers to the overload threshold value that is set in advance to trigger the overload shedding strategy.

[0119] The substation collects the real-time power of the high-voltage and medium-voltage sides of the main transformer, calculates the difference between the actual power of the main transformer and the preset limit, obtains the overload, and sends the overload to the main station through inter-station communication.

[0120] After receiving the overload amount from the substation, the master station compares the overload amount with the preset overload start-up value. If the overload amount exceeds the preset overload start-up value, the master station triggers the overload shedding strategy and determines the overload amount as the target shedding amount for the shedding type.

[0121] As an optional implementation, after receiving the overload amount from the substation, the master station compares the overload amount with the total available load of the power grid. If the overload amount does not exceed the total available load, the master station determines the overload amount as the target amount to be removed for the load removal type; if the overload amount exceeds the total available load, the master station determines the total available load as the target amount to be removed for the load removal type and issues an alarm signal.

[0122] In this embodiment, by determining the target shedding amount of the load shedding type based on the overload amount when the main transformer is overloaded, a rapid response and precise shedding of the main transformer overload fault is achieved, ensuring the safe operation of the main transformer equipment and the power grid.

[0123] The following sections will describe in detail the power cut-off control methods of the power grid stability control system, taking examples of cutting off new energy sources, cutting off generators, and cutting off loads.

[0124] like Figure 6 As shown and Figure 7 As shown, the power cut-off control method based on the negative feedback model, when cutting off new energy sources in the State Grid's standardized three-layer architecture stability control system, includes the following steps: In the State Grid's standardized three-layer architecture stability control system, according to the system tripping strategy, when the three-layer master station detects a double-circuit line trip causing cross-sectional overload, the tripping strategy is activated, and the required disconnection P is calculated according to the formula. cut (i.e., target cutoff amount): Required cutoff amount = (section power - preset value) × cutoff coefficient - power imbalance setpoint. Here, section power refers to the real-time power of the section, preset value refers to the preset section power setpoint, cutoff coefficient refers to the preset cutoff coefficient, and power imbalance setpoint refers to the preset power imbalance setpoint. This required cutoff amount prioritizes cutting new energy sources. The new energy capacity to be cutoff is calculated, and the cutoff amount is distributed to the substation.

[0125] S602, the substation sorts each new energy execution station according to its available capacity, and sequentially cuts off the first N-1 stations. For the remaining power to be cut off, it selects the stations that meet the minimum overcut requirement from the remaining stations and allocates the new energy capacity to the new energy execution stations that need to be cut off.

[0126] S603, the new energy execution station acts as the execution measure station (i.e., execution control node), based on the new energy capacity (i.e., the required cut-off amount) P issued by the substation. cut For input values.

[0127] S604, according to formula P act =P cut -△P calculates the actual cut amount (i.e., the corrected cut amount) P act △P is the overcutting amount (i.e., historical overcutting error), which is 0 in the first calculation (i.e., the preset initial value).

[0128] S605, New energy execution station according to calculated actual cut quantity P act The implementation measures are as follows: Components are sorted by capacity according to their compliance with the cutoff conditions (operation without other abnormalities, and the cutoff pressure plate in operation). The first N-1 components (i.e., the first part of the target cutoff targets) are cut off sequentially. The last component is then selected from the remaining components and cut off based on the minimum overcut condition (i.e., the second part of the target cutoff targets that meet the minimum overcut condition). The actual control quantity (i.e., the actual cutoff quantity) P is calculated by summing the actual output component power. out Calculate the new overcut ΔP = P out -P act .

[0129] S606, when switching to new energy sources again within the same startup cycle, the substation issues a switching quantity P. cut As an input quantity, it participates in the calculation to complete the closed-loop control and realize the over-shear compensation function.

[0130] like Figure 8 As shown, the power cut-off control method based on the negative feedback model, when switching off generators in the State Grid's standardized three-layer architecture stability control system, includes the following steps: In the State Grid's standardized three-layer architecture stability control system, according to the system strategy, when the three-layer master station detects a double-circuit line trip causing a section overload, the tripping strategy is activated, and the required disconnection P is calculated according to the formula. cut Required capacity cutoff = (section power - preset value) × cutoff coefficient - power imbalance set value. This required capacity cutoff will prioritize cutting new energy sources. After the new energy sources are cutoff, the new energy source will be cutoff. The cutoff amount = required capacity cutoff - new energy source capacity cutoff. The cutoff amount will be distributed to the substation.

[0131] S802, the substation collects information from each unit. The substation acts as the site for implementing unit switching measures, based on the switching capacity P issued by the main station. cutFor input values.

[0132] S803, according to formula P act =P cut -△P calculates the actual cutting volume P act △P is the overcut, which is 0 in the first calculation.

[0133] S804, substation calculates actual cutting quantity P act The implementation measures are as follows: Units are sorted by capacity from largest to smallest, and the first N-1 units are sequentially cut off. Among the remaining units, the unit with the smallest over-cut is found. The actual control quantity P is calculated by summing the actual output power of each unit. out Calculate the amount of shear ΔP = P out -P act .

[0134] S805, Substation according to actual control quantity P out A tripping command is issued to the tripping execution station where the unit is located, and the tripping execution station executes the tripping measures according to the received command.

[0135] S806, When switching units again within the same startup cycle, the third-level master station issues the switching quantity P. cut As an input quantity, it participates in the calculation to complete the closed-loop control and realize the over-shear compensation function.

[0136] like Figure 9 The diagram illustrates the power shedding control method based on a negative feedback model applied to the State Grid's standardized three-layer architecture stability control system during load shedding, including the following steps: In the State Grid's standardized three-tier architecture stability control system, according to the main transformer overload shedding strategy, when the three-tier main station receives the overload amount sent by the substation, the overload shedding strategy is activated. Based on the shedding capacity (i.e., the required shedding amount, or the target shedding amount) = overload amount = main transformer power - overload action power setting, the shedding capacity is sent to the substation.

[0137] S902, the substation receives load shedding information for rounds 1-8 from each load execution station. The substation acts as the site for implementing load shedding measures, based on the load shedding capacity P issued by the main station. cut For input values.

[0138] S903, according to formula P act =P cut -△P calculates the actual cutting volume P act △P is the overcut, which is 0 in the first calculation.

[0139] S904, Substation calculates actual cutting quantity P act The implementation measures involve determining the load capacity for each station in rounds 1-8 based on the load station priority settings, until the shelving volume exceeds P. actCalculate the actual control quantity P by summing the actual load capacity at the outlet. out Calculate the amount of shear ΔP = P out -P act .

[0140] S905, Substation according to actual control quantity P out The load shedding cycle command is issued to each load shedding execution station, and the load shedding execution station cuts off load lines with a priority less than or equal to that cycle command.

[0141] S906, when load shedding occurs again within the same startup cycle, the third-level master station issues the load shedding quantity P. cut As an input quantity, it participates in the calculation to complete the closed-loop control and realize the over-shear compensation function.

[0142] The negative feedback model in this embodiment uses the overcut amount ΔP as a feedback signal to achieve closed-loop compensation control within the same control cycle. Compared with the traditional stability control system, which executes independently in each round and lacks coordination between rounds, the negative feedback model in this embodiment makes the actual cut-off amount in each round approach the target cut-off amount at the cumulative level. This directly eliminates the root cause of the cumulative overcut amount when the strategy is implemented in multiple rounds, avoids the waste of power resources and the loss of reserve capacity, and ensures the safe and stable operation of the power grid.

[0143] The power cut-off control methods for the power grid stabilization system provided in the above embodiments can achieve over-cut-off compensation. Without significantly increasing costs or the complexity of strategy execution, they improve the accuracy of power cut-off in multiple rounds within the same cycle, thereby improving the reliability of the stabilization system and avoiding power resource waste caused by over-cut-off.

[0144] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0145] Corresponding to the power cut-off control method of a power grid stability control system described in the above embodiments, in an exemplary embodiment, a power cut-off control device for a power grid stability control system is provided, which is configured at the execution control node of the power grid stability control system. For example... Figure 10 As shown, the device includes: The power cut-off quantity acquisition module 1001 is used to acquire the target cut-off quantity of the current power cut-off task; The correction module 1002 is used to determine the corrected cutoff amount based on the target cutoff amount and the historical overcutting error when the current power cutoff task is a non-first power cutoff task in the current control cycle; the historical overcutting error is the overcutting error generated by the previous power cutoff task that belongs to the same control type and the same control cycle as the current power cutoff task. The actual cut-off amount determination module 1003 is used to control the target execution station to perform power cut-off operations according to the corrected cut-off amount, and to determine the actual cut-off amount of the current power cut-off task after the power cut-off operation; Update module 1004 is used to update historical overcutting errors based on the actual resection amount and the corrected resection amount.

[0146] As an optional implementation, the actual power cut-off determination module 1003 includes: a filtering unit for filtering target power cut-off objects from candidate power cut-off objects based on the corrected cut-off amount; a cut-off unit for performing power cut-off operations on the target power cut-off objects; and a summing unit for summing the power of the target power cut-off objects that have actually completed the power cut-off operations to determine the actual power cut-off amount of the current power cut-off task after the power cut-off operations.

[0147] As an optional implementation, the cut-off unit is specifically used for: sorting candidate power cut-off objects according to a preset sorting rule; determining the top (N-1) candidate power cut-off objects based on the power of the sorted candidate power cut-off objects to obtain a first part of target cut-off objects; wherein the cumulative power of the top N candidate power cut-off objects is greater than or equal to the corrected cut-off amount, and the cumulative power of the top (N-1) candidate power cut-off objects is less than the corrected cut-off amount; selecting candidate power cut-off objects that satisfy the minimum overcutting condition as the second part of target cut-off objects from among the candidate power cut-off objects other than the first part of target cut-off objects; the minimum overcutting condition includes: the sum of the cumulative power of the first part of target cut-off objects and the power of the second part of target cut-off objects is not less than the corrected cut-off amount and the difference between the sum of power and the corrected cut-off amount is the smallest; determining the target cut-off objects based on the first part of target cut-off objects and the second part of target cut-off objects.

[0148] As an optional implementation, the execution control node is determined according to the control type corresponding to the current power cut-off task; wherein, when the control type is the new energy cut-off type, the execution control node is the new energy execution station in the power grid stability control system, and the target execution station is the new energy execution station itself; when the control type is the generator cut-off type or the load cut-off type, the execution control node is the substation in the power grid stability control system, and the target execution station is the generator cut-off execution station or the load cut-off execution station in the power grid stability control system.

[0149] As an optional implementation, the device further includes: an initial correction module, used to determine a corrected cutoff amount based on the target cutoff amount and a preset initial value when the current power cutoff task is the first power cutoff task of the current control cycle.

[0150] Corresponding to the power cut-off control method of a power grid stability control system described in the above embodiments, in an exemplary embodiment, a power cut-off control device for a power grid stability control system is provided, which is configured at the master station of the power grid stability control system. For example... Figure 11 As shown, the device includes: The power cut-off quantity determination module 1101 is used to determine the target power cut-off quantity for the current power cut-off task based on the fault type of the power grid. The sending module 1102 is used to send the target cutoff amount to the execution control node of the power grid stability control system; the execution control node is used to execute the power cutoff control method of the power grid stability control system.

[0151] As an optional implementation, when the fault type is a double-circuit line trip causing a section overload fault, the required shaving quantity determination module 1101 is specifically used to: determine the power deviation based on the real-time power of the section and the preset section power setting; determine the initial required shaving quantity based on the power deviation, the preset tripping coefficient, and the preset power imbalance setting; obtain the total amount of available renewable energy; when the total amount of available renewable energy is not less than the initial required shaving quantity, determine the initial required shaving quantity as the target shaving quantity for the renewable energy type; when the total amount of available renewable energy is less than the initial required shaving quantity, determine the total amount of available renewable energy as the target shaving quantity for the renewable energy type, and determine the target shaving quantity for the tripping type based on the initial required shaving quantity and the total amount of available renewable energy.

[0152] As an optional implementation, when the fault type is a main transformer overload fault, the load shedding determination module 1101 is specifically used to: receive the overload amount sent by the substation in the power grid stability control system; when the overload amount exceeds the preset overload start setting, determine the target shedding amount of the load shedding type based on the overload amount.

[0153] It should be noted that the information interaction and execution process between the modules in the power cut-off control device of the above-mentioned power grid stabilization system are based on the same concept as the method embodiment of this application. For details on their specific functions and technical effects, please refer to the method embodiment section, which will not be repeated here.

[0154] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 12 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs in the non-volatile storage media to run. The database stores data required for the power cut-off control method of the power grid stability control system. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements the power cut-off control method of the power grid stability control system.

[0155] Those skilled in the art will understand that Figure 12 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0156] In one exemplary embodiment, a computer-readable storage medium is provided that stores a computer program, which, when executed by a processor, can implement the steps in the various method embodiments described above.

[0157] In one exemplary embodiment, a computer program product is provided that, when run on a computer device, enables the computer device to perform the steps described in the various method embodiments above.

[0158] 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, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying the computer program code to a photographic device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks.

[0159] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0160] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0161] In the embodiments provided in this application, it should be understood that the disclosed apparatus / network devices and methods can be implemented in other ways. For example, the apparatus / network device embodiments described above are merely illustrative. For instance, the division of modules or units 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.

[0162] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0163] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power trip control method of a power grid stability control system, characterized by, An execution control node applied to a power grid stability control system, wherein the power cut-off control method of the power grid stability control system includes: Obtain the target cut-off amount for the current power cut-off task; If the current power cut-off task is not the first power cut-off task in this control cycle, the corrected cut-off amount is determined based on the target cut-off amount and the historical overcutting error; the historical overcutting error is the overcutting error generated by the previous power cut-off task that belongs to the same control type and the same control cycle as the current power cut-off task. According to the corrected cutoff amount, the target execution station performs a power cutoff operation and determines the actual cutoff amount of the current power cutoff task after the power cutoff operation; The historical overcutting error is updated based on the actual resection amount and the corrected resection amount.

2. The power cut-off control method for the power grid stabilization system according to claim 1, characterized in that, The step of controlling the target execution station to perform a power cut-off operation according to the corrected cut-off amount, and determining the actual cut-off amount of the current power cut-off task after the power cut-off operation, includes: Based on the corrected resection amount, the target resection object is selected from the candidate power resection objects; The control target execution station performs a power cut-off operation on the target cut-off object; The power of the target object that actually completed the power cut-off operation is summed to determine the actual cut-off amount of the current power cut-off task after the power cut-off operation.

3. The power cut-off control method for the power grid stabilization system according to claim 2, characterized in that, The step of selecting target resection objects from candidate power resection objects based on the corrected resection amount includes: The candidate power removal objects are sorted according to the preset sorting rules; Based on the power of the ranked candidate power cut-off objects, the top (N-1) candidate power cut-off objects are determined to obtain the first part of the target cut-off objects; wherein, the cumulative power of the top N candidate power cut-off objects is greater than or equal to the corrected cut-off amount, and the cumulative power of the top (N-1) candidate power cut-off objects is less than the corrected cut-off amount. Among the candidate power cut-off objects other than the first part of the target cut-off objects, the candidate power cut-off objects that satisfy the minimum overcutting condition are selected as the second part of the target cut-off objects; the minimum overcutting condition includes: the sum of the cumulative power of the first part of the target cut-off objects and the power of the second part of the target cut-off objects is not less than the corrected cut-off amount and the difference between the sum of the power and the corrected cut-off amount is the smallest; The target resection object is determined based on the first part of the target resection object and the second part of the target resection object.

4. The power cut-off control method for the power grid stabilization system according to claim 1, characterized in that, The execution control node is determined according to the control type corresponding to the current power cut-off task; wherein, when the control type is the new energy cut-off type, the execution control node is the new energy execution station in the power grid stability control system, and correspondingly, the target execution station is the new energy execution station itself; when the control type is the generator cut-off type or the load cut-off type, the execution control node is a substation in the power grid stability control system, and correspondingly, the target execution station is the generator cut-off execution station or the load cut-off execution station in the power grid stability control system.

5. The power cut-off control method for the power grid stabilization system according to claim 1, characterized in that, Also includes: If the current power cut-off task is the first power cut-off task of this control cycle, the corrected cut-off amount is determined based on the target cut-off amount and the preset initial value.

6. A power cut-off control method for a power grid stability control system, characterized in that, A master station applied to a power grid stability control system, wherein the power cut-off control method of the power grid stability control system includes: The target power cut-off amount for the current power cut-off task is determined based on the type of fault in the power grid. The target cutoff amount is sent to the execution control node of the power grid stability control system; the execution control node is used to execute the power cutoff control method of the power grid stability control system as described in any one of claims 1 to 5.

7. The power cut-off control method for the power grid stabilization system according to claim 6, characterized in that, When the fault type is a double-circuit line trip causing section overload fault, determining the target power cut-off amount for the current power cut-off task based on the fault type of the power grid includes: The power deviation is determined based on the real-time power of the cross-section and the preset cross-section power value. The initial required cutoff amount is determined based on the power deviation, the preset cutoff coefficient, and the preset power imbalance value. Obtain the total amount of available new energy sources; When the total amount of available new energy sources is not less than the initial required amount, the initial required amount is determined as the target amount to be removed for the new energy source type. When the total amount of available new energy is less than the initial required amount, the total amount of available new energy is determined as the target amount to be removed for the new energy type, and the target amount to be removed for the cutting machine type is determined based on the initial required amount and the total amount of available new energy.

8. The power cut-off control method for the power grid stabilization system according to claim 6, characterized in that, When the fault type is a main transformer overload fault, determining the target power cut-off amount for the current power cut-off task based on the fault type of the power grid includes: Receive overload data sent by the substation in the power grid stability control system; When the overload exceeds the preset overload start value, the target shedding amount of the load shedding type is determined based on the overload.

9. A power grid stabilization system, characterized in that, include: Execution control node and master station; The execution control node and the master station are connected via a communication link; The execution control node is used to execute the power cut-off control method of the power grid stability control system as described in any one of claims 1 to 5; The master station is used to execute the power cut-off control method of the power grid stabilization system as described in any one of claims 6 to 8.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a power cut-off control method for a power grid stabilization system as described in any one of claims 1 to 5, or to implement a power cut-off control method for a power grid stabilization system as described in any one of claims 6 to 8.

Images