Power transmission line tripping processing method and device and terminal equipment

Abstract

The invention discloses a power transmission line tripping processing method and device and terminal equipment, and belongs to the technical field of power transmission line fault processing, and the method comprises the steps: obtaining a signal chain of each power transmission line in a power grid in real time, and judging whether the tripping of the power transmission line causes the voltage loss of a power supply region where the current power transmission line is located or not when any power transmission line trips; when the power supply area loses voltage, basic parameters of the voltage-loss power supply area are obtained, and a target function and security constraints and topological connectivity constraints of the target function are constructed by taking minimization of switch operation cost and maximization of recovery of the sum of power supply load priority weights of the voltage-loss power supply area as targets; solving the objective function under the constraint to obtain a switch operation sequence and a load recovery strategy; and power restoration is carried out on the voltage-loss power supply area according to a solving result. According to the invention, the problem of low processing efficiency caused by manual inspection processing when the power transmission line fails in the prior art can be solved, and the trip processing efficiency of the power transmission line is improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission line fault handling technology, and in particular to a method, apparatus and terminal equipment for handling power transmission line tripping. Background Technology

[0002] Transmission line tripping is a common fault in power grid operation. Rapid detection and handling of transmission line tripping are crucial for ensuring the safe and stable operation of the power grid and reliable power supply to users. Currently, the judgment of transmission line tripping is mainly made by the power grid dispatcher through on-site inspection to determine the tripping situation and take corresponding measures. However, this manual judgment method is highly subjective and inefficient. Summary of the Invention

[0003] This invention provides a method, apparatus, terminal equipment, and storage medium for handling power transmission line trips, which can solve the problems of high subjectivity and low efficiency caused by manual inspection and handling of power transmission line faults in the prior art, and improve the power restoration efficiency of power transmission line trip handling.

[0004] An embodiment of the present invention provides a method for handling power transmission line tripping, comprising: The signal chains of each transmission line in the power grid are acquired in real time, and the tripping of the transmission line is determined based on the signal chains. When any transmission line trips, determine whether the tripping of the transmission line causes a loss of power in the power supply area where the current transmission line is located; If a power transmission line trips, causing a power outage in the area where the current power transmission line is located, the basic parameters of the power outage area are obtained. The basic parameters include: power grid topology, set of loads to be restored, priority weight of each load, power supply status of each load, set of controllable switches, operating cost of each switch, closed status of each switch, power demand of each load, and rated capacity of each power transmission line other than the tripped power transmission line. Based on the aforementioned basic parameters, with the objectives of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area, an objective function, along with the security constraints and topological connectivity constraints of the objective function, are constructed. Under the constraints of the security constraints and topological connectivity constraints, the objective function is solved to obtain the switching operation sequence and load restoration strategy for the undervoltage power supply area under the conditions of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area. Power is restored to the under-voltage power supply area according to the switching operation sequence and load restoration strategy.

[0005] Furthermore, determining whether a power transmission line has tripped based on the signal chain includes: If any preset signal chain is satisfied in the signal chain, it is determined that the transmission line has tripped. The preset signal chain includes a first successful reclosing signal chain, a first unsuccessful reclosing signal chain, and a second reclosing signal chain. The first successful reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, and a first switch closing signal. The first unsuccessful reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, and a second switch opening signal. The second reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, a second protection action signal, and a second switch opening signal.

[0006] Furthermore, it also includes: If a power transmission line trip causes a power outage in the area where the current power transmission line is located and it is necessary to restore power to the power outage area based on the tripped power transmission line, or if a power transmission line trip does not cause a power outage in the area where the current power transmission line is located, the trip type shall be determined according to the signal chain. If the signal chain corresponds to a successful reclosing signal chain, the tripping type is determined to be a transient fault tripping, and a first tripping notification is generated based on the transient fault tripping; the first equipment ledger information of the tripped transmission line is obtained, and the first tripping notification is transmitted to the dispatchers of each first equipment maintenance unit based on the first equipment ledger information; wherein, the first equipment ledger information includes each first equipment maintenance unit of the tripped transmission line; If the signal chain corresponds to a signal chain indicating a failed first reclosing or a second reclosing, the tripping type is determined to be a short-circuit fault tripping. A second tripping notification is generated based on the short-circuit fault tripping. The second equipment ledger information of the tripped transmission line is obtained, and the second tripping notification is transmitted to each second equipment maintenance unit based on the second equipment ledger information. The second equipment ledger information includes each second equipment maintenance unit of the tripped transmission line.

[0007] Furthermore, after transmitting the second trip notification to each of the second equipment maintenance units based on the second equipment ledger information, the process also includes: Acquire multi-source data of the tripped transmission line, and determine the risk type of the tripped transmission line based on the multi-source data; wherein, the risk type includes high risk and low risk, and the multi-source data includes power grid operation data, tripping equipment information, and tripping event characteristics; When the risk type is high and the transmission line is allowed to be forcibly powered, prepare for the forced power supply of the transmission line, verify the power restoration of the tripped transmission line, and forcibly power supply the tripped transmission line when the power restoration verification is passed. If not, prepare for the trial power supply of the tripped transmission line, verify the power restoration preparation for the tripped transmission line, and perform a trial power supply for the tripped transmission line when the power restoration verification is passed.

[0008] Furthermore, the first equipment ledger information also includes a first backup contact person, and the second equipment ledger information also includes a second backup contact person; The step of transmitting the first trip notification to each of the first equipment maintenance units based on the first equipment ledger information includes: The first trip notification is transmitted to each first equipment maintenance unit according to the first equipment ledger information, and the first response information of each first equipment maintenance unit is obtained. If the first response information is not received within a preset time, the first trip notification is transmitted to the first backup contact person according to the first equipment ledger information. The step of transmitting the second trip notification to each of the second equipment maintenance units based on the second equipment ledger information includes: The second trip notification is transmitted to each of the second equipment maintenance units according to the second equipment ledger information, and the second response information of each of the second equipment maintenance units is obtained. If the second response information is not received within a preset time, the second trip notification is transmitted to the second backup contact person according to the second equipment ledger information.

[0009] Furthermore, the objective function is specifically: in, This represents the set of loads to be restored; Indicates load Priority weights; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state; Represents a set of controllable switches; Indicates switch Operating costs; Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed.

[0010] Furthermore, the security constraints are specifically as follows: in, For load Power requirements; For power transmission lines Rated capacity; A collection of transmission lines; This represents the set of loads to be restored; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

[0011] Furthermore, the topological connectivity constraint specifically includes: in, Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

[0012] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments; One embodiment of the present invention provides a transmission line tripping processing device, including: a tripping determination module, a regional undervoltage determination module, an optimization strategy construction module, and a recovery module; The tripping determination module is used to acquire the signal chain of each transmission line in the power grid in real time, and determine whether the transmission line has tripped based on the signal chain. The regional power outage determination module is used to determine whether the power outage of the transmission line tripping will cause power outage in the power supply area where the current transmission line is located when the power transmission line trips. The optimization strategy construction module is used to obtain basic parameters of the power supply area where the current transmission line is located if a transmission line trip causes a power outage. These basic parameters include: grid topology, set of loads to be restored, priority weights of each load, power supply status of each load, set of controllable switches, operating costs of each switch, closed status of each switch, power demand of each load, and rated capacity of all transmission lines except the tripped transmission line. Based on these basic parameters, an objective function is constructed with the goal of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The objective function is then solved under these constraints to obtain the switch operation sequence and load restoration strategy for the power supply area under the conditions of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The recovery module is used to restore power to the undervoltage power supply area according to the switching operation sequence and load recovery strategy.

[0013] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a power transmission line tripping processing method as described in the above-described embodiment of the invention.

[0014] The following benefits can be obtained by implementing the present invention: This invention provides a method, apparatus, and terminal equipment for handling power transmission line trips. The method acquires the signal chain of the power transmission line in real time and then determines the trip based on the signal chain. Trip determination using the signal chain improves efficiency compared to manual inspection. After determining that a power transmission line has tripped, it is determined whether the trip has caused a power outage in the affected area. If a power outage occurs, an objective function is constructed, along with its security and topological connectivity constraints, with the goal of minimizing switching operation costs and maximizing the sum of priority weights for restoring the power supply load in the affected area. The objective function is then solved to determine the switching operation sequence and load restoration strategy for the affected area while minimizing switching operation costs and maximizing the sum of priority weights for restoring the power supply load. The affected area is then restored using the switching operation sequence and load restoration strategy. By constructing the objective function and solving the constraints to find the optimal switching operation sequence and load restoration strategy, power can be restored after a power transmission line trip by scheduling resources within the affected area, thus improving the efficiency of power supply restoration after a power transmission line trip. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating a method for handling power transmission line tripping according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a power transmission line tripping processing device provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted beforehand that the method of this invention relies on an Operation Control System (OCS) and a Supervisory Control and Data Acquisition System (SCADA) for implementation. Signal transmission primarily depends on the OCS system, while data acquisition primarily depends on the SCADA system. The OCS system is deployed in the safety production zone of the power grid system. Dispatchers access SCADA data through the OCS system. The OCS is commonly used for functions such as real-time monitoring within the station, remote control, integrated management, and PASS calculation. The SCADA system is a subsystem of the OCS system. This system can collect various data from the power system, such as grid topology and equipment signals, store, process, and statistically analyze the data, and provide an intuitive visualization interface for real-time display and analysis.

[0019] like Figure 1 As shown, to address the problems of high subjectivity and low efficiency caused by manual inspection and handling of transmission line faults in existing technologies, an embodiment of the present invention provides a method for handling transmission line tripping, including: Step S1: Acquire the signal chain of each transmission line in the power grid in real time, and determine whether the transmission line has tripped based on the signal chain; Step S2: When any transmission line trips, determine whether the tripping of the transmission line causes a loss of power in the power supply area where the current transmission line is located; Step S3: If the tripping of a transmission line causes a loss of power in the power supply area where the current transmission line is located, obtain the basic parameters of the power supply area where the power supply is lost; wherein, the basic parameters include: power grid topology, set of loads to be restored, priority weight of each load, power supply status of each load, set of controllable switches, operating cost of each switch, closing status of each switch, power demand of each load and rated capacity of each transmission line other than the tripped transmission line; Step S4: Based on the basic parameters, with the objectives of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights in the power supply recovery area, construct an objective function and the security constraints and topological connectivity constraints of the objective function; Step S5: Solve the objective function under the constraints of the security constraints and topological connectivity constraints to obtain the switching operation sequence and load restoration strategy for the undervoltage power supply area under the conditions of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area; Step S6: Restore power to the undervoltage power supply area according to the switching operation sequence and load restoration strategy.

[0020] For step S1, the signal chain of each transmission line in the power grid is monitored in real time to determine whether the transmission line has tripped.

[0021] In a preferred embodiment, determining whether a transmission line has tripped based on the signal chain includes: determining that the transmission line has tripped when the signal chain satisfies any one of the preset signal chains; wherein, the preset signal chains include a first successful reclosing signal chain, a first unsuccessful reclosing signal chain, and a second reclosing signal chain; the first successful reclosing signal chain includes a time-series combination of a first protection action signal, a first switch opening signal, a reclosing action signal, and a first switch closing signal; the first unsuccessful reclosing signal chain includes a time-series combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, and a second switch opening signal; the second reclosing signal chain includes a time-series combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, a second protection action signal, and a second switch opening signal.

[0022] Specifically, all signals in the signal chain are obtained from the signal database of the OCS system. Each signal is accompanied by a precise timestamp. Based on the timestamps, the acquired signals are combined in a timing sequence to obtain the corresponding signal chain. In this invention, tripping scenarios are divided into three scenarios based on the signal chain: "line tripping and reclosing successfully," "line tripping and reclosing unsuccessfully," and "line tripping twice in a short period." The signal chains for these three scenarios correspond to a single successful reclosing signal chain, a single unsuccessful reclosing signal chain, and a double reclosing signal chain, respectively. If the signal chain is consistent with the single successful reclosing signal chain, that is, if its timing combination within a preset time period (e.g., within 10 seconds) satisfies the timing combination of "first protection action signal → first switch opening signal → reclosing action signal → first switch closing signal," then it is determined that the transmission line has tripped, and the corresponding tripping scenario is "line tripping and reclosing successfully." If the signal chain matches the signal chain of the first unsuccessful reclosing, meaning its timing combination within a preset time period (e.g., within 10 seconds) satisfies the sequence of "first protection action signal → first switch opening signal → reclosing action signal → first switch closing signal → second switch opening signal," then the transmission line is determined to have tripped, and the corresponding tripping scenario is "line tripping and unsuccessful reclosing." If the signal chain matches the signal chain of the second reclosing, meaning its timing combination within a preset time period (e.g., within 10 seconds) satisfies the sequence of "first protection action signal → first switch opening signal → reclosing action signal → first switch closing signal → second protection action signal → second switch opening signal," then the transmission line is determined to have tripped, and the corresponding tripping scenario is "line tripping twice in a short period." If the signal chain does not match any of the above three preset signal chains, then the transmission line is considered not to have tripped.

[0023] For step S2, when it is determined that any transmission line has tripped, it is necessary to determine whether the tripping has caused a loss of voltage in the power supply area where the transmission line is located. If the transmission line has not tripped, no intervention is required. Specifically, whether a loss of voltage in the power supply area has occurred can be determined by detecting the voltage at the grid nodes.

[0024] For step S3, when it is determined that a transmission line trip has caused a power outage in the current power supply area, the basic parameters of the power outage area are obtained to determine the optimal recovery strategy for restoring power to the power outage area. Preferably, before obtaining the basic parameters of the power outage area, it also includes determining whether the tripped transmission line can be restored using the optimal recovery strategy. Specifically, firstly, the voltage, current, switch positions, and closed states of each transmission line in the power grid need to be obtained through the SCADA system. Based on the protection action signals in the signal chain, the real-time alarm window signals in the protection information system and OCS system are checked. The corresponding alarm window signals are used to confirm whether the fault has been isolated. If not isolated, the fault isolation area and non-fault area are divided using graph theory algorithms based on the power grid topology database. The remaining current carrying capacity of the backup line is checked to see if it meets the load transfer requirements, and the real-time available power of new energy sources such as photovoltaics and energy storage is assessed. If, in the non-faulty area, there is a backup line or power source connected to the undervoltage area (a condition for determining whether a feasible path exists), the capacity of the backup line is not less than the total load demand of the undervoltage area (a condition for determining whether the capacity is met), and the adjusted operating mode will not trigger the protection device to malfunction (a condition for determining whether the protection device meets the protection requirements), then the operation of obtaining the basic parameters of the undervoltage power supply area to determine the optimal recovery strategy is performed. If any condition is not met, then proceed to the next step S7.

[0025] The basic parameters obtained above include: power grid topology, set of loads to be restored, priority weight of each load, power supply status of each load, set of controllable switches, operating cost of each switch, closing status of each switch, power demand of each load, and rated capacity of each transmission line except for the tripped transmission line; among them, power grid topology is used to determine the topological relationship between load nodes, switches and equipment (such as transformers) on each transmission line in the power grid.

[0026] For step S4, based on the basic parameters, with the goal of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area, an objective function is constructed, along with the security constraints and topological connectivity constraints of the objective function.

[0027] In a preferred embodiment, the objective function is specifically: in, This represents the set of loads to be restored; Indicates load Priority weights are assigned to first-level loads in this invention. Secondary load Level 3 load ; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state; Represents a set of controllable switches; Indicates switch Operating costs; Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed. This represents the sum of load priority weights that maximize power restoration; This represents minimizing the cost of switching operations.

[0028] In a preferred embodiment, the security constraint specifically includes: in, For load Power requirements; For power transmission lines Rated capacity; A collection of transmission lines; This represents the set of loads to be restored; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

[0029] In a preferred embodiment, the topological connectivity constraint specifically includes: in, Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

[0030] For step S5, the objective function is solved under the aforementioned security and topological connectivity constraints. This solution process can be performed quickly using a mixed-integer linear programming solver, such as CPLEX or Gurobi, to obtain the optimal solution. The optimal solution of this invention is the switching operation sequence and load restoration strategy for the power outage area, minimizing the switching operation cost and maximizing the sum of load priority weights for power restoration. Specifically, the switching operation sequence is determined based on the switching restoration priority and the switches to be restored, while the load restoration strategy is determined based on the loads to be restored and the loads to be disconnected.

[0031] Preferably, before restoring power to the de-energized area according to the switch operation sequence and load restoration strategy, the restoration plan needs to be fed back to the dispatcher of the OCS system for further manual judgment and decision-making. Specifically, the faulty area is highlighted in the power grid topology diagram of the OCS system's operation interface, and the switch operation sequence and load restoration strategy are highlighted and marked with execution sequences. The dispatcher can manually modify parameters such as load priority and operation cost weight to regenerate the plan. After confirmation, the restoration plan in step S6 is executed to restore power to the de-energized area. Through dual verification by machines and humans, the feasibility of the transmission line restoration plan is ensured.

[0032] In a preferred embodiment, it further includes: Step S7: If the power line tripping causes a loss of power in the power supply area where the current power line is located and it is necessary to restore power to the power supply area where the power supply is lost according to the tripped power line, or if the power line tripping does not cause a loss of power in the power supply area where the current power line is located, determine the tripping type according to the signal chain. Step S8: If the signal chain corresponds to a successful reclosing signal chain, determine the tripping type as a transient fault tripping, and generate a first tripping notification based on the transient fault tripping; obtain the first equipment ledger information of the tripped transmission line, and transmit the first tripping notification to the dispatchers of each first equipment maintenance unit based on the first equipment ledger information; wherein, the first equipment ledger information includes each first equipment maintenance unit of the tripped transmission line; If the signal chain corresponds to a failed reclosing signal chain or a secondary reclosing signal chain, determine the tripping type as a short-circuit fault tripping, and generate a second tripping notification based on the short-circuit fault tripping; obtain the second equipment ledger information of the tripped transmission line, and transmit the second tripping notification to each second equipment maintenance unit based on the second equipment ledger information; wherein, the second equipment ledger information includes each second equipment maintenance unit of the tripped transmission line.

[0033] Specifically, for step S7, if a transmission line trip causes a power outage in the area supplied by the current transmission line and requires restoration of power to the affected area, or if the transmission line trip does not cause a power outage in the area supplied by the current transmission line, the trip type is determined based on the signal chain. For step S8, if the signal chain corresponds to a successful reclosing signal chain, the trip scenario is determined to be "successful line trip reclosing," and the corresponding trip type is determined to be a transient fault trip. If the signal chain corresponds to either a failed reclosing signal chain or a failed second reclosing signal chain, and the trip scenario is determined to be "failed line trip reclosing" or "two short-term line trips," these two trip scenarios are classified as short-circuit fault trips in this invention. When the trip type is a transient fault trip, a first trip notification is generated based on the transient fault trip. Preferably, when generating the first or second trip notification, the OCS system can dynamically obtain the line attributes (including overhead lines, cables, mixed lines, etc.), the corresponding maintenance unit (maintenance department), tower information, trench information, protection configuration, and other ledger information of the tripped transmission line. This obtained information is added to the first trip notification before transmission. The line attributes, tower information, trench information, and protection configuration of the tripped transmission line can be obtained from the OCS power flow diagram. After generating the first trip notification, the ledger information of the first equipment associated with the tripped transmission line needs to be obtained. This ledger information includes at least the maintenance units of each piece of equipment associated with the tripped transmission line. Preferably, the ledger information may also include basic information of each associated piece of equipment, such as equipment number, equipment name, model, specifications, manufacturer, and installation location; rated configuration information of each associated piece of equipment, such as rated voltage, rated current, rated frequency, and rated power; and maintenance information of each associated piece of equipment, such as maintenance plans and maintenance records. The first trip notification is transmitted to each of the first equipment maintenance units based on the information in the first equipment ledger, informing them to inspect and repair the tripped transmission line. Similarly, after generating the second trip notification, the second equipment ledger information associated with the tripped transmission line needs to be obtained. This second equipment ledger information includes at least each of the second equipment maintenance units associated with the tripped transmission line. Preferably, the second equipment ledger information may also include basic information, rated configuration information, and maintenance information of each associated equipment of the tripped transmission line, which will not be elaborated here. The second trip notification is then transmitted to each of the second equipment maintenance units based on the second equipment ledger information, informing them to inspect and repair the tripped transmission line.

[0034] After transmitting the first trip notification, the corresponding processing work order information is generated and a trip record report is generated.

[0035] Preferably, in addition to transmitting the first trip notification or the second trip notification to the dispatcher and the corresponding maintenance unit at this time, after determining whether a trip has occurred in step S1, a preliminary warning notification can be sent to the associated units (the substations on both sides of the tripped transmission line and the maintenance unit of the tripped transmission line) and the dispatcher. The preliminary warning notification includes the name of the transmission line, the tripping time, the tripping scenario, and the inspection requirements information; among which, the inspection requirements information includes the requirements for substation inspection and transmission line inspection.

[0036] In a preferred embodiment, the first equipment ledger information further includes a first backup contact person, and the second equipment ledger information further includes a second backup contact person; The step of transmitting the first trip notification to each first equipment maintenance unit according to the first equipment ledger information includes: transmitting the first trip notification to each first equipment maintenance unit according to the first equipment ledger information, and obtaining the first response information of each first equipment maintenance unit; if the first response information is not received within a preset time, transmitting the first trip notification to the first backup contact person according to the first equipment ledger information. The step of transmitting the second trip notification to each of the second equipment maintenance units according to the second equipment ledger information includes: transmitting the second trip notification to each of the second equipment maintenance units according to the second equipment ledger information, and obtaining the second response information of each of the second equipment maintenance units. If the second response information is not received within a preset time, the second trip notification is transmitted to the second backup contact person according to the second equipment ledger information.

[0037] Specifically, to avoid situations where the first or second equipment maintenance unit fails to receive the notification, leading to missed inspections, the process of obtaining the first equipment log information also includes obtaining the corresponding first backup contact person. When transmitting the first trip notification to each first equipment maintenance unit, it is also necessary to simultaneously obtain the response information of each unit, such as through heartbeat detection to determine whether the first trip notification has been received. If a first equipment maintenance unit fails to receive the first trip notification (i.e., fails to receive the first response information from the first equipment maintenance unit), the first backup contact person from the first equipment log information is obtained, and a notification is sent to the first backup contact person to instruct them to inspect the equipment on the tripped transmission line, or to instruct the corresponding first equipment maintenance unit to inspect the equipment on the tripped transmission line. Similarly, when notifying the second equipment maintenance unit, if no second response information is received from the second equipment maintenance unit, the corresponding second backup contact person must also be notified so that the second backup contact person can take appropriate action.

[0038] In a preferred embodiment, after transmitting the second trip notification to each of the second equipment maintenance units based on the second equipment ledger information, the method further includes: Step S9: Obtain multi-source data of the tripped transmission line, and determine the risk type of the tripped transmission line based on the multi-source data; wherein, the risk type includes high risk and low risk; Step S10: If the risk type is high risk and forced resending is allowed for the tripped transmission line, prepare for forced resending of the tripped transmission line, verify the re-energization of the forced resending preparation for the tripped transmission line, and force resend the tripped transmission line when the re-energization verification of the forced resending preparation is passed. Step S11: If not, prepare for the test power supply of the tripped transmission line, verify the test power supply preparation and re-energization of the tripped transmission line, and test power supply the tripped transmission line when the test power supply preparation and re-energization verification is passed.

[0039] Specifically, for step S9, acquiring multi-source data of the tripped transmission line, and determining the risk type of the transmission line based on the multi-source data; wherein, the risk type includes high risk and low risk. The acquired multi-source data includes: grid operation data, tripping equipment information, and tripping event characteristics. The grid operation data includes grid operation data acquired from the SCADA system, such as system load (main transformer load, line load, and bus load), renewable energy output (photovoltaic output and wind power output), grid power flow distribution, and transmission line reserve capacity. The tripping equipment information includes the line type (e.g., overhead line type, cable type, mixed line type), structural parameters (e.g., line length, conductor type, double-circuit identification on the same tower, crossing points), and insulation configuration (e.g., insulator type, pollution level) of the tripped transmission line, obtained through equipment ledger information. The data includes: creepage distance, equipment importance, equipment health, equipment defect records, protection configuration information, and reclosing information (whether it is in operation and reclosing method); tripping event characteristics include: fault electrical quantities (such as fault phase and fault current amplitude), tripping event timing characteristics (such as protection start time, protection action time, switch opening time, reclosing action time, and switch closing time), associated meteorological data (such as wind speed, rainfall, and lightning activity), and operation and maintenance records (equipment maintenance records and defect ledger records); among them, associated meteorological data is obtained through the meteorological bureau interface of the OCS system, and lightning activity data is obtained through the database of the power grid lightning strike location system. Based on the acquired multi-source data, a mathematical model is constructed based on industry standards to output risk values ​​and levels (Level I to Level VI), where the risk value calculation formula is: in, Indicates the risk value; Represents the probability value; Indicates the hazard value.

[0040] Hazard value = (Severity of consequences) × (Social impact factor) × (Loss load or user nature factor); According to the "Investigation Procedures for Power Accidents of China Southern Power Grid Co., Ltd.", the severity of consequences can be divided into extremely serious accidents, major accidents, relatively serious accidents, general accidents, and events of levels one to eight, with each accident and event corresponding to a different value. The severity of consequences is calculated comprehensively based on dimensions such as load loss and the number of substations with undervoltage in the power grid operation data, with the load loss determined according to the system load.

[0041] The social impact factor is divided into general period, special period and power supply guarantee period, each with different values. This data comes from power grid operation data, and the parameter is configured according to actual needs.

[0042] The loss load or user nature factor is divided into general load, important city load, important user and power supply guaranteed user, each with different values. This data comes from tripped equipment information and is configured according to the importance of user / load.

[0043] Probability value = Equipment type factor × Fault category factor × Historical data statistics factor × Weather influence factor × Equipment defect factor.

[0044] The equipment type factor is divided into main transformer, busbar, cable, overhead line, double circuit on the same pole, DC line and generator, each with different values. This data comes from tripped equipment information.

[0045] The fault category factor is determined based on the reclosing results and is divided into first-level fault, second-level fault and third-level fault, each corresponding to a different value. This data is obtained based on the analysis of power grid operation data.

[0046] Historical data statistical factors are determined based on equipment health and equipment defect records, and are divided into overhead transmission lines, main transformers and busbars, each with different values. This data comes from tripped equipment information.

[0047] Weather influencing factors are determined based on wind speed and rainfall, and are divided into normal, typhoon, thunderstorm and strong wind, forest fire risk, high temperature and heavy fog, and icing, each corresponding to different values. This data comes from the characteristics of power outage events.

[0048] The factors affecting equipment defects are categorized into normal conditions, equipment abnormalities, general defects, emergency defects, and major defects, each corresponding to different values. This data is derived from tripped equipment information and is determined based on the equipment's health status.

[0049] Based on the calculated risk values, risk levels are classified. In this invention, the risk levels are divided as follows: Level I (red): R ≥ 1500; Level II (orange): 800 ≤ R < 1500; Level III (yellow): 120 ≤ R < 800; Level IV (blue): 20 ≤ R < 120; Level V (white): 5 ≤ R < 20. Among them, Level I is the high-risk type, and the other levels are the low-risk types.

[0050] Preferably, after determining the risk type and risk level, a risk warning notice is sent to the transmission and substation units and dispatchers. The risk warning notice includes the risk level, recommended handling measures (handling measures include forced transmission or trial transmission), and a list of conditions that need to be verified for power restoration under each handling measure.

[0051] For step S10, if the risk type is high-risk and forced reenergizing of the tripped transmission line is permitted, preparations for forced reenergizing are made for the tripped transmission line, and a verification of reenergization under the preparation for forced reenergizing is conducted. The object of the reenergizing verification is the transmission line maintenance unit, and the verification content includes the absence of obvious defects such as collapsed towers or broken lines, and the absence of live-line work. If these conditions are met, it is determined that forced reenergizing can be carried out. Forced reenergizing of the transmission line is then performed.

[0052] It should be noted that the verification of power restoration preparation for forced transmission must be carried out within 15 minutes. If the time limit is exceeded, the operation must be frozen and the dispatcher must be notified to manually intervene and verify.

[0053] For step S11, if the risk type is low risk or high risk and forced reenergization of the tripped transmission line is not permitted, prepare for trial reenergization of the tripped transmission line, and verify the reenergization preparation. The verification targets are the substation and transmission line maintenance units. The verification content includes: the substation switch appears normal and the protection action is normal; the transmission line has no obvious defects such as tower collapse or line breakage and no live-line work; and the cable section insulation test is normal. If these conditions are met, it is determined that trial reenergization can be carried out, and the tripped transmission line is then tested. It should be noted that the reenergization verification for trial reenergization preparation must be performed within 10 minutes. If the time limit is exceeded, the operation must be frozen, and the dispatcher must be notified for manual verification. Preferably, when the dispatcher intervenes manually, the closing operation of the switches on both sides of the tripped transmission line can be performed through the manual authorization system in a non-verification manner.

[0054] It should be noted that during trial or forced re-energization, the two switches on both sides of the tripped transmission line must be closed according to the real-time operating conditions on both sides, using methods such as checking for no voltage, checking for synchronization, or not checking, in order to restore power to the transmission line. The selection logic for each switch's closing method is as follows: After performing the closing operation, it is necessary to determine whether the closing was successful. If the closing was successful, an event report is generated and the tripping process is completed. If it failed, the dispatcher will manually intervene to handle the tripping, and an event report will be generated after the process is completed.

[0055] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0056] like Figure 2 As shown, an embodiment of the present invention provides a power transmission line tripping processing device, including: a tripping determination module, a regional undervoltage determination module, an optimization strategy construction module, and a recovery module; The tripping determination module is used to acquire the signal chain of each transmission line in the power grid in real time, and determine whether the transmission line has tripped based on the signal chain. The regional power outage determination module is used to determine whether the power outage of the transmission line tripping will cause power outage in the power supply area where the current transmission line is located when the power transmission line trips. The optimization strategy construction module is used to obtain basic parameters of the power supply area where the current transmission line is located if a transmission line trip causes a power outage. These basic parameters include: grid topology, set of loads to be restored, priority weights of each load, power supply status of each load, set of controllable switches, operating costs of each switch, closed status of each switch, power demand of each load, and rated capacity of all transmission lines except the tripped transmission line. Based on these basic parameters, an objective function is constructed with the goal of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The objective function is then solved under these constraints to obtain the switch operation sequence and load restoration strategy for the power supply area under the conditions of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The recovery module is used to restore power to the undervoltage power supply area according to the switching operation sequence and load recovery strategy.

[0057] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0058] Those skilled in the art will clearly understand that, for convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0059] Based on the above method embodiments, the present invention provides corresponding terminal device embodiments.

[0060] One embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a power transmission line tripping processing method as described in any one of the present invention.

[0061] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0062] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0063] The memory can be used to store the computer program. The processor implements various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0064] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for handling power transmission line tripping, characterized in that, include: The signal chains of each transmission line in the power grid are acquired in real time, and the tripping of the transmission line is determined based on the signal chains. When any transmission line trips, determine whether the tripping of the transmission line causes a loss of power in the power supply area where the current transmission line is located; If a power transmission line trips, causing a power outage in the area where the current power transmission line is located, the basic parameters of the power outage area are obtained. The basic parameters include: power grid topology, set of loads to be restored, priority weight of each load, power supply status of each load, set of controllable switches, operating cost of each switch, closed status of each switch, power demand of each load, and rated capacity of each power transmission line other than the tripped power transmission line. Based on the aforementioned basic parameters, with the objectives of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area, an objective function, along with the security constraints and topological connectivity constraints of the objective function, are constructed. Under the constraints of the security constraints and topological connectivity constraints, the objective function is solved to obtain the switching operation sequence and load restoration strategy for the undervoltage power supply area under the conditions of minimizing the switching operation cost and maximizing the sum of the power supply load priority weights for restoring the undervoltage power supply area. Power is restored to the under-voltage power supply area according to the switching operation sequence and load restoration strategy.

2. The method for handling power transmission line tripping as described in claim 1, characterized in that, The step of determining whether a power transmission line has tripped based on the signal chain includes: If any preset signal chain is satisfied in the signal chain, it is determined that the transmission line has tripped. The preset signal chain includes a first successful reclosing signal chain, a first unsuccessful reclosing signal chain, and a second reclosing signal chain. The first successful reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, and a first switch closing signal. The first unsuccessful reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, and a second switch opening signal. The second reclosing signal chain includes a time-sequential combination of a first protection action signal, a first switch opening signal, a reclosing action signal, a first switch closing signal, a second protection action signal, and a second switch opening signal.

3. The method for handling power transmission line tripping as described in claim 2, characterized in that, Also includes: If a power transmission line trip causes a power outage in the area where the current power transmission line is located and it is necessary to restore power to the power outage area based on the tripped power transmission line, or if a power transmission line trip does not cause a power outage in the area where the current power transmission line is located, the trip type shall be determined according to the signal chain. If the signal chain corresponds to a successful reclosing signal chain, the tripping type is determined to be a transient fault tripping, and a first tripping notification is generated based on the transient fault tripping; the first equipment ledger information of the tripped transmission line is obtained, and the first tripping notification is transmitted to each first equipment maintenance unit based on the first equipment ledger information; wherein, the first equipment ledger information includes each first equipment maintenance unit of the tripped transmission line; If the signal chain corresponds to a signal chain indicating a failed first reclosing or a second reclosing, the tripping type is determined to be a short-circuit fault tripping. A second tripping notification is generated based on the short-circuit fault tripping. The second equipment ledger information of the tripped transmission line is obtained, and the second tripping notification is transmitted to each second equipment maintenance unit based on the second equipment ledger information. The second equipment ledger information includes each second equipment maintenance unit of the tripped transmission line.

4. The method for handling power transmission line tripping as described in claim 3, characterized in that, After transmitting the second trip notification to each of the second equipment maintenance units based on the second equipment ledger information, the process also includes: Acquire multi-source data of the tripped transmission line, and determine the risk type of the tripped transmission line based on the multi-source data; wherein, the risk type includes high risk and low risk, and the multi-source data includes power grid operation data, tripping equipment information, and tripping event characteristics; When the risk type is high risk and forced resending is allowed for the tripped transmission line, prepare for forced resending of the tripped transmission line, verify the re-energization of the forced resending preparation for the tripped transmission line, and force resend the tripped transmission line when the re-energization verification of the forced resending preparation is passed. If not, prepare for the trial power supply of the tripped transmission line, verify the power restoration preparation for the tripped transmission line, and perform a trial power supply for the tripped transmission line when the power restoration verification is passed.

5. A method for handling power transmission line tripping as described in claim 4, characterized in that, The first equipment ledger information also includes a first backup contact person, and the second equipment ledger information also includes a second backup contact person; The step of transmitting the first trip notification to each of the first equipment maintenance units based on the first equipment ledger information includes: The first trip notification is transmitted to each first equipment maintenance unit according to the first equipment ledger information, and the first response information of each first equipment maintenance unit is obtained. If the first response information is not received within a preset time, the first trip notification is transmitted to the first backup contact person according to the first equipment ledger information. The step of transmitting the second trip notification to each of the second equipment maintenance units based on the second equipment ledger information includes: The second trip notification is transmitted to each of the second equipment maintenance units according to the second equipment ledger information, and the second response information of each of the second equipment maintenance units is obtained. If the second response information is not received within a preset time, the second trip notification is transmitted to the second backup contact person according to the second equipment ledger information.

6. A method for handling power transmission line tripping as described in claim 5, characterized in that, The objective function is specifically: in, This represents the set of loads to be restored; Indicates load Priority weights; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state; Represents a set of controllable switches; Indicates switch Operating costs; Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed.

7. A method for handling power transmission line tripping as described in claim 6, characterized in that, The security constraints are specifically as follows: in, For load Power requirements; For power transmission lines Rated capacity; A collection of transmission lines; This represents the set of loads to be restored; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

8. A method for handling power transmission line tripping as described in claim 7, characterized in that, The topological connectivity constraints are specifically as follows: in, Indicates switch The closed state, {0,1}, where 0 represents the switch being open and 1 represents the switch being closed; Indicates load Power supply status, {0,1}, where 0 represents an abnormal power supply state and 1 represents a normal power supply state.

9. A power transmission line tripping handling device, characterized in that, include: Trip determination module, area undervoltage determination module, optimization strategy construction module, and recovery module; The tripping determination module is used to acquire the signal chain of each transmission line in the power grid in real time, and determine whether the transmission line has tripped based on the signal chain. The regional power outage determination module is used to determine whether the power outage of the transmission line tripping will cause power outage in the power supply area where the current transmission line is located when the power transmission line trips. The optimization strategy construction module is used to obtain basic parameters of the power supply area where the current transmission line is located if a transmission line trip causes a power outage. These basic parameters include: grid topology, set of loads to be restored, priority weights of each load, power supply status of each load, set of controllable switches, operating costs of each switch, closed status of each switch, power demand of each load, and rated capacity of all transmission lines except the tripped transmission line. Based on these basic parameters, an objective function is constructed with the goal of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The objective function is then solved under these constraints to obtain the switch operation sequence and load restoration strategy for the power supply area under the conditions of minimizing switch operating costs and maximizing the sum of power supply load priority weights in the power supply area to be restored. The recovery module is used to restore power to the undervoltage power supply area according to the switching operation sequence and load recovery strategy.

10. A terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a transmission line tripping handling method as described in any one of claims 1 to 8.

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