Photovoltaic power transmission line thermal stable cutting method and device, electronic equipment and storage medium

Abstract

The application discloses a photovoltaic power transmission line thermal stability cutting method and device, electronic equipment and storage medium, relates to the photovoltaic power generation technical field, and includes: presetting the first overload threshold corresponding to the single-circuit tripping of the outgoing line and the second overload threshold corresponding to the two-circuit tripping; periodically acquiring the real-time cuttable capacity of all cuttable power collection line combinations of the photovoltaic power station and sorting them from small to large; real-time monitoring of the total power of the multi-circuit outgoing line, judging whether a tripping event occurs and the number of tripping; calculating the corresponding power difference to be cut according to the number of tripping and the total power before tripping; selecting the power collection line combination greater than or equal to and closest to the difference as the target combination to execute cutting. The application can maximize the reduction of the cutting amount of the photovoltaic power station generation capacity under the premise of strictly guaranteeing the safe operation of the outgoing line thermal stability, and significantly improves the power generation benefit of the photovoltaic power station.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power generation technology, and in particular to a method, apparatus, electronic device and storage medium for a photovoltaic transmission line thermal stabilization and disconnection machine. Background Technology

[0002] Against the backdrop of global energy structure transformation and the construction of new energy systems, the scale of clean energy power generation, such as photovoltaic (PV) power, is rapidly expanding. PV power plants are connected to the grid via multiple transmission lines. When any one of these transmission lines trips due to a fault, the power output of the remaining lines can easily exceed the thermal stability limit, threatening the safe and stable operation of the power grid. Related technologies employ fixed collector line disconnection schemes, and the disconnection action precedes the line reclosing, resulting in significant over-disconnection of generating capacity. They cannot dynamically calculate the required disconnection capacity based on the real-time power generation of the PV power plant, nor do they set differentiated disconnection control logic for different numbers of trips. This makes it impossible to select the collector line combination with the minimum over-disconnection while meeting the thermal stability constraints of the lines, making it difficult to maximize the generation capacity of the PV power plant while ensuring grid safety, thus affecting the power generation efficiency of the plant. Summary of the Invention

[0003] This application provides a method, apparatus, electronic device, and storage medium for thermal stabilization tripping of photovoltaic transmission lines. It can solve the problem in related technologies where the use of fixed collector line tripping schemes makes it impossible to dynamically calculate the required tripping capacity based on the real-time power generation of the photovoltaic power plant, and the lack of differentiated control logic for different tripping cycles leads to severe over-tripping of power generation capacity.

[0004] According to a first aspect of this application, a method for thermal stabilization switching of photovoltaic transmission lines is provided, comprising:

[0005] A preset overload threshold is provided, which includes a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line. The real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power plant is periodically obtained, and the real-time cut-off capacity is sorted from smallest to largest. Real-time monitoring of the total power of multiple outgoing lines, and determination of whether an outgoing line tripping event has occurred and the number of trips; When a single outgoing line trips and the total power before the trip is greater than the first overload threshold, the first required power difference is calculated. When two outgoing lines trip and the total power before the trip is greater than the second overload threshold, the second required power difference is calculated. Based on the sorted cut-off capacity, a collector line combination with a cut-off capacity greater than or equal to the required cut-off power difference and closest to the required cut-off power difference is selected as the target combination, and the collector lines in the target combination are cut off.

[0006] According to a second aspect of this application, a photovoltaic transmission line thermal stabilization and disconnection machine device is provided, comprising: The preset module is configured to preset overload thresholds, which include a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line. The acquisition module is configured to periodically acquire the real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power plant, and sort the real-time cut-off capacity from smallest to largest. The monitoring module is configured to monitor the total power of multiple outgoing lines in real time and determine whether an outgoing line tripping event has occurred and the number of trips. The calculation module is configured to calculate the first power difference to be cut when a single outgoing line trips and the total power before the trip is greater than the first overload threshold, and to calculate the second power difference to be cut when two outgoing lines trip and the total power before the trip is greater than the second overload threshold. The execution module is configured to select a collector line combination whose cut-off capacity is greater than or equal to the required cut-off power difference and is closest to the required cut-off power difference as the target combination, and execute the cut-off of the collector lines in the target combination.

[0007] According to a third aspect of this application, an electronic device is provided, comprising: At least one processor; and memory that is communicatively connected to at least one processor; The memory stores instructions that can be executed by at least one processor, which are executed by at least one processor to enable the at least one processor to perform the photovoltaic transmission line thermal stabilization cutting machine method described in the first aspect above.

[0008] According to a fourth aspect of this application, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to cause a computer to execute the photovoltaic transmission line thermal stabilization and cutting machine method described in the first aspect above.

[0009] According to a fifth aspect of this application, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the photovoltaic transmission line thermal stabilization and cutting machine method as described in the first aspect above.

[0010] This application addresses the problem of excessive capacity cut-off in related technologies due to the pre-set differentiated overload thresholds corresponding to different tripping counts of transmission lines. It periodically acquires and sorts the real-time cut-off capacity of all cut-off collector line combinations, monitors the total power of transmission lines and tripping events in real time, calculates the required cut-off power difference based on the number of tripping counts and the total power before tripping, and selects collector line combinations that are greater than or equal to and closest to this difference for cut-off. This solves the problem of excessive capacity cut-off caused by the use of fixed collector line cut-off schemes in related technologies, which cannot dynamically calculate the required cut-off capacity based on the real-time power generation of the photovoltaic power plant and lack differentiated control logic for different tripping counts. The application achieves the technical effect of minimizing the amount of photovoltaic power plant capacity cut-off while strictly ensuring the thermal stability and safety of transmission lines, thus significantly improving the power generation efficiency of the photovoltaic power plant.

[0011] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0012] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments 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.

[0013] Figure 1 This is a schematic flowchart of a photovoltaic transmission line thermal stabilization and disconnection machine method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a photovoltaic transmission line thermal stabilization and cutting machine device provided in an embodiment of this application. Detailed Implementation

[0014] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0015] The specific implementation method of this application is described in detail using a 35kV photovoltaic power station as an example. This photovoltaic power station has an installed capacity of 78MW on the AC side, connected to a 35kV photovoltaic switchyard via four collector lines, and then connected to the power grid via three 35kV transmission lines. The technical data involved in subsequent embodiments, such as the thermal stability parameters of the transmission lines, the maximum generating capacity of the collector lines, and the number of disconnectable combinations, are all based on the actual system configuration of this power station. Those skilled in the art should understand that the technical solution of this invention is not limited to the parameter configuration of this specific power station and can be adaptively adjusted according to the transmission line structure, installed capacity, and thermal stability requirements of different photovoltaic power stations.

[0016] The following description, with reference to the accompanying drawings, describes a method, apparatus, electronic device, and storage medium for photovoltaic transmission line thermal stabilization and cutting-off machines according to embodiments of this application.

[0017] Figure 1 This is a schematic flowchart of a photovoltaic transmission line thermal stabilization and disconnection machine method provided in an embodiment of this application.

[0018] like Figure 1 As shown, the method includes the following steps: Step 101: Preset overload thresholds, which include a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line.

[0019] In some embodiments, a preset overload threshold is a preliminary configuration step in the photovoltaic transmission line thermal stability tripping method, used to clarify the tripping start-up conditions under different transmission line fault scenarios. The overload threshold is set differently based on the thermal stability operating parameters and the number of fault trips of the transmission line, and is divided into two categories: a first overload threshold and a second overload threshold. The first overload threshold corresponds to a fault scenario where a single transmission line trips, and the second overload threshold corresponds to a fault scenario where two transmission lines trip.

[0020] The single-circuit control power of the outgoing line is 27MW, and the preset dead zone is 0.5MW. The first overload threshold is calculated as twice the single-circuit control power of the outgoing line plus the preset dead zone, resulting in 54.5MW. The second overload threshold is calculated as the single-circuit control power of the outgoing line plus the preset dead zone, resulting in 27.5MW. The preset dead zone is used to filter out small fluctuations in the total power of the outgoing line, preventing unnecessary generator tripping actions triggered by instantaneous power fluctuations, and improving the anti-interference capability and operational reliability of the generator tripping strategy.

[0021] By presetting differentiated overload thresholds, precise tripping start thresholds can be set for outgoing line faults of different severity, avoiding false or missed triggering of tripping actions, and providing a reliable basis for subsequent dynamic calculation of required tripping capacity and execution of tripping operations.

[0022] Step 102: Periodically obtain the real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power station, and sort the real-time cut-off capacity from smallest to largest.

[0023] In some embodiments, periodically acquiring the real-time switchable capacity of all switchable collector line combinations in a photovoltaic power station and sorting the real-time switchable capacities from smallest to largest is a fundamental step in achieving dynamic and precise power generation. A switchable collector line combination is any non-empty subset of all collector lines in the photovoltaic power station, and the number of combinations is determined by the binomial theorem. Taking a 35kV photovoltaic power station as an example, this power station has four collector lines connected to it; therefore, there are a total of 10 switchable collector line combinations, including four single-circuit collector line combinations and six two-circuit collector line combinations.

[0024] The real-time power generation of each collector line is collected according to a preset adjustable period, with the period setting range from 30 seconds to 3 minutes. Based on the collected current power generation of each collector line, the real-time cut-off capacity corresponding to each cut-off collector line combination is calculated one by one. The real-time cut-off capacity is the sum of the current power generation of all collector lines in the combination.

[0025] The calculated real-time switchable capacity of all switchable collector line combinations is arranged in ascending order to form an ordered switchable capacity sequence. This sequence is updated synchronously with changes in the real-time power generation of each collector line to ensure that it always accurately reflects the actual switchable capacity of the photovoltaic power plant.

[0026] This step enables dynamic adaptation to the characteristics of photovoltaic power plant power generation changes with sunlight and environmental conditions, providing accurate and real-time capacity basis for selecting the optimal tripping combination based on actual fault scenarios, and effectively avoiding over-tripping problems caused by fixed tripping capacity.

[0027] Step 103: Monitor the total power of multiple outgoing lines in real time, and determine whether an outgoing line tripping event has occurred and the number of trips.

[0028] In some embodiments, real-time monitoring of the total power of multiple outgoing lines and determination of whether an outgoing line tripping event has occurred and the number of trips are the trigger judgment links of the thermal stability tripping method, providing the core basis for the initiation of subsequent tripping actions.

[0029] By connecting to the monitoring and control devices and protection devices of the three outgoing lines, the system collects real-time operating parameters such as three-phase active power, circuit breaker position status, and line current for each outgoing line. The real-time active power of the three outgoing lines is accumulated and calculated to obtain the total power of the multiple outgoing lines. The total power data is continuously updated at a millisecond frequency to ensure accurate reflection of the real-time transmission status of the lines.

[0030] Based on the collected circuit breaker position signals and electrical quantity change characteristics, a comprehensive judgment is made as to whether a tripping event has occurred on an outgoing line. When the circuit breaker of a certain outgoing line changes from the closed position to the open position, and at the same time the active power of the line drops sharply to near zero and the line current disappears, it is determined that the outgoing line has tripped. After confirming the tripping event, the number of outgoing lines currently in the open state is counted to determine whether the number of trips due to this fault is one or two.

[0031] This step enables quick and accurate identification of outgoing line faults and their severity, avoiding misjudgments of single signals that could lead to erroneous or missed tripping actions, and ensuring that the tripping strategy can be activated promptly and correctly after a fault occurs.

[0032] Step 104: When a single outgoing line trips and the total power before the trip is greater than the first overload threshold, calculate the first power difference to be cut. When two outgoing lines trip and the total power before the trip is greater than the second overload threshold, calculate the second power difference to be cut.

[0033] In some embodiments, after determining the tripping event and the number of trips of the transmitting line, the total power data of the transmitting line at the moment before the tripping occurred is retrieved and compared with the overload threshold of the corresponding number of trips. Using the total power before the tripping for calculation can avoid calculation errors caused by the sudden change in line power at the moment of tripping and ensure the accuracy of the required disconnection capacity calculation results.

[0034] When a single outgoing line trip is detected, the total power before the trip is compared with the first overload threshold of 54.5MW. If the total power before the trip is less than or equal to 54.5MW, it means that the transmission capacity of the remaining two outgoing lines can carry the current total generating power, and no generator tripping operation is required. If the total power before the trip is greater than 54.5MW, the first required power cut-off difference is calculated, which is equal to the total power before the trip minus the first overload threshold of 54.5MW.

[0035] When it is determined that two outgoing lines have tripped, the total power before the trip is compared with the second overload threshold of 27.5MW. If the total power before the trip is less than or equal to 27.5MW, it means that the transmission capacity of the remaining single outgoing line can carry the current total generating power, and no generator tripping operation is required. If the total power before the trip is greater than 27.5MW, then the second required power tripping difference is calculated, which is equal to the total power before the trip minus the second overload threshold of 27.5MW.

[0036] This step allows for precise differentiation of the power cut-off requirements under different fault severity levels. Power cut-off calculations are only initiated when absolutely necessary, and the minimum power cut-off value is quantified, providing accurate numerical data for selecting the optimal power cut-off combination.

[0037] Step 105: Based on the sorted cut-off capacity, select a collector line combination whose cut-off capacity is greater than or equal to the required cut-off power difference and is closest to the required cut-off power difference as the target combination, and execute the cut-off of the collector lines in the target combination.

[0038] In some embodiments, based on the ascending sequence of switchable capacities generated in step 102, the calculated required power cut-off difference is inserted into the corresponding position in the sequence, and the collector line combination that follows the required power cut-off difference is taken as the target combination. The switchable capacity of this combination is greater than or equal to the required power cut-off difference, and it is the combination that is closest to the required power cut-off difference among all combinations that meet the conditions, which can ensure that the remaining transmission power after the tripping of the generator just meets the thermal stability requirements of the line, while achieving minimum over-cutting.

[0039] After determining the target combination, the thermal stabilization tripping unit sends trip control commands to the circuit breakers corresponding to all collector lines in the target combination, quickly disconnecting the corresponding collector lines from the 35kV busbar and completing the tripping operation. After the tripping operation is completed, the total transmission power of the remaining outgoing lines will be reduced to below the corresponding overload threshold, ensuring that the line operating power does not exceed the control value of 27MW and the limit value of 32.4MW.

[0040] This step enables dynamic and precise matching of power generation capacity, avoiding the drawbacks of fixed power generation schemes that cut off fixed collector line combinations regardless of the actual required capacity. This effectively reduces unnecessary power generation capacity loss and significantly improves the power generation efficiency of photovoltaic power plants while ensuring the thermal stability and safe operation of transmission lines.

[0041] Compared with related technologies, in this embodiment, by presetting overload thresholds, the overload thresholds include a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line; periodically acquiring the real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power station, and sorting the real-time cut-off capacity from smallest to largest; real-time monitoring of the total power of multiple transmitting lines, and determining whether a transmitting line tripping event has occurred and the number of trips; when a single transmitting line trips and the total power before the trip is greater than the first overload threshold, calculating the first required power difference; when two transmitting lines trip and the total power before the trip is greater than the second overload threshold, calculating the second required power difference; based on the sorted cut-off capacity, selecting a collector line combination whose cut-off capacity is greater than or equal to the required power difference and is closest to the required power difference as the target combination, and executing the cut-off of the collector lines in the target combination. This technology can solve the problem of excessive capacity cut-off caused by the use of fixed collector line cut-off schemes in related technologies, which cannot dynamically calculate the required cut-off capacity based on the real-time power generation of the photovoltaic power station and do not set differentiated control logic for different trip numbers. It achieves the technical effect of minimizing the amount of photovoltaic power station capacity cut-off while strictly ensuring the thermal stability and safety of the transmission line, and significantly improving the power generation efficiency of the photovoltaic power station.

[0042] As a specific implementation of this application, based on the basic scheme, when selecting the target combination, if there are multiple collector line combinations whose cut-off capacity is greater than or equal to the required cut-off power difference and is closest to the required cut-off power difference, then the combination with the fewest cut-off collector lines is selected as the target combination.

[0043] Specifically, during the selection of target combinations, there may be multiple collector line combinations with the same cut-off capacity value. When the cut-off capacity of multiple collector line combinations is greater than or equal to the difference in required cut-off power, and the difference in required cut-off power is equal to the difference in required cut-off power, i.e., they are all combinations closest to the difference in required cut-off power, a priority judgment condition for the number of collector lines to be cut off is introduced.

[0044] Among multiple candidate combinations that meet the capacity matching requirements, the number of collector circuits in each combination is counted, and the combination with the fewest circuits is selected as the final target combination. For example, when the closest available cut-off capacity corresponding to a certain required power cut-off difference exists in both a single-circuit collector circuit combination and a two-circuit collector circuit combination, the single-circuit collector circuit combination is selected first for the cut-off operation.

[0045] This supplementary limitation minimizes the number of disconnected collector lines while ensuring that the tripped capacity meets thermal stability requirements, thus reducing the impact of faults on the normal operation of photovoltaic power plants. Simultaneously, fewer disconnected circuits simplify the subsequent power restoration process for the collector line transformer substations, shorten substation outage time, and further improve the operating efficiency and power generation benefits of photovoltaic power plants.

[0046] As a specific implementation of this application, based on the basic scheme, the method of selecting the target combination is further defined as follows: insert the required power cut-off difference into the sequence of cut-off capacities sorted from smallest to largest, and take the collector line combination that is one position after the required power cut-off difference.

[0047] Specifically, in the selection process of the target combination, a sequence insertion positioning method is used to achieve fast and accurate matching of the closest capacity combination. The calculated required power cut-off difference is used as the insertion value and inserted into the ascending sequence of available cut-off capacities generated in step 102. The insertion position is after all available cut-off capacities smaller than the required power cut-off difference and before all available cut-off capacities greater than or equal to the required power cut-off difference. The collector line combination that is the first one after this insertion position is the target combination that meets the capacity requirements and is closest to the required power cut-off difference.

[0048] For example, when the sorted cut-off capacity sequence is 18.22MW, 18.72MW, 20.46MW, 21.6MW, 36.94MW, 38.68MW, 39.18MW, 39.82MW, 40.32MW, and 42.06MW, if the calculated first required cut-off power difference is 19MW, inserting 19MW into the sequence will result in a cut-off capacity of 20.46MW for the first position after it, corresponding to the No. 1 collector line combination. This combination is then selected as the target combination for the cut-off operation.

[0049] This selection method determines the target combination through a simple sequence positioning operation. Its calculation logic is clear, its execution efficiency is high, and it meets the response speed requirements of thermally stabilized shearing units. Simultaneously, this method strictly guarantees that the selected combination is the one with the smallest cut-off capacity among all combinations that meet the capacity requirements, fundamentally achieving the design goal of minimum over-cutting and avoiding unnecessary power generation capacity loss.

[0050] As a specific implementation of this application, based on the basic scheme, it is further defined that all cut-off collector line combinations are any non-empty subsets of all collector lines in the photovoltaic power station, and the number of combinations is determined by the binomial theorem.

[0051] Specifically, the scope of cut-off collector line combinations includes any non-empty subset of all collector lines in the photovoltaic power plant, that is, all single-circuit collector line combinations, any combination of two or more collector lines, but excluding empty sets without collector lines. This scope covers all possible cut-off schemes, ensuring that no cut-off combination that meets thermal stability requirements is overlooked.

[0052] The number of cuttable collector line combinations is determined by the binomial theorem. For a photovoltaic power station with n collector lines, the formula for calculating the number of all non-empty subsets is 2^n - 1. In this embodiment, the photovoltaic power station has a total of 4 collector lines. According to the binomial theorem, theoretically, there are 15 possible cuttable collector line combinations. Considering the upper limit requirement for the number of cut circuits in the subsequent tripping constraints, the actual number of cuttable combinations participating in the sorting and selection is 10, including 4 single-circuit collector line combinations and 6 two-circuit collector line combinations.

[0053] This constraint enables the establishment of a complete machine-switching combination enumeration system, ensuring that the optimal target combination can be selected from all feasible machine-switching schemes under any fault scenario, providing a comprehensive combination foundation for achieving minimum over-switching. Simultaneously, the combination generation logic based on the binomial theorem is clear, facilitating automated combination generation and real-time capacity calculation for the thermally stabilized machine-switching device, thereby improving the device's operational reliability and computational efficiency.

[0054] As a specific implementation of this application, the method is further limited to include machine switching constraints on top of the basic solution: When a single outgoing line trips, the number of collector circuits disconnected shall not exceed the preset upper limit. When two outgoing lines trip, at least one collector line shall be kept intact.

[0055] Specifically, this implementation adds tripping constraints to the basic tripping logic to limit the boundary range of tripping operations, avoiding excessive tripping or total power outages in extreme cases, and further ensuring the operational safety and power generation continuity of the photovoltaic power station. The tripping constraints are executed in conjunction with the capacity matching logic, completing constraint verification during the target combination selection stage to ensure that the finally selected target combination simultaneously meets both capacity and constraint requirements.

[0056] When a single outgoing line trips, the number of collector circuits disconnected does not exceed a preset upper limit, which is set to 2 circuits in this embodiment. This upper limit is determined based on the actual operating parameters of the power plant. Calculations show that after a single outgoing line trips, disconnecting a maximum of 2 collector circuits is sufficient to meet the thermal stability requirements of the remaining lines, without the need to disconnect more circuits. When generating disconnectable collector circuit combinations, only combinations of single and two collector circuits are included, automatically excluding combinations of three or more collector circuits, thus limiting the upper limit of the number of disconnected circuits from the source.

[0057] When two outgoing lines trip, at least one collector line is kept operational. This constraint prevents a complete power outage of the photovoltaic power station due to generator tripping, ensuring the continuity of power supply to the power station's basic operating system. During the screening of switchable combinations, combinations containing all four collector lines are automatically excluded, ensuring that at least one collector line remains operational under any circumstances, maintaining the power station's basic generating capacity and equipment power supply.

[0058] By setting the above-mentioned generator tripping constraints, the impact range of generator tripping operations can be further limited while ensuring the thermal stability of the transmission lines. This avoids unnecessary multi-circuit disconnection and eliminates the risk of a complete power outage. It not only improves the safety and reliability of the generator tripping strategy but also maximizes the preservation of the photovoltaic power station's power generation capacity and reduces economic losses caused by faults.

[0059] As a specific implementation of this application, based on the basic scheme, the first overload threshold is further defined as twice the single-circuit control power of the transmission line plus a preset dead zone, and the second overload threshold is equal to the single-circuit control power of the transmission line plus a preset dead zone, wherein the preset dead zone is 0.5MW.

[0060] Specifically, this implementation clarifies the specific calculation methods for the first and second overload thresholds, and determines the machine start-up threshold through a quantitative formula, making the setting of the overload threshold more scientific and accurate, and avoiding subjective errors caused by manual experience setting.

[0061] The first overload threshold corresponds to a fault scenario where a single outgoing line trips. It is calculated as twice the control power of the single outgoing line plus a preset dead zone. The control power of a single outgoing line is 27MW, therefore the calculated first overload threshold is 54.5MW. This value corresponds to the total control power of the remaining two outgoing lines after a single outgoing line trips, ensuring that the operating power of the remaining lines after the generator trip does not exceed the single outgoing line control power requirement.

[0062] The second overload threshold corresponds to a fault scenario where two outgoing lines trip. It is calculated by adding the control power of a single outgoing line to a preset dead zone, resulting in a value of 27.5MW. This value corresponds to the control power of the remaining single outgoing line after the two lines trip, ensuring that the operating power of the remaining single line after the generator trip is within a safe range.

[0063] The preset dead zone is set to 0.5MW to filter out small, instantaneous fluctuations in photovoltaic power generation caused by factors such as changes in sunlight and cloud cover. This dead zone prevents the tripping logic from being repeatedly or falsely triggered when the total power fluctuates frequently near the overload threshold, effectively improving the anti-interference capability and operational stability of the tripping strategy.

[0064] By defining this implementation, a precise and unified standard for tripping and starting the generator can be provided for different fault scenarios. This ensures the thermal stability and safety of the transmission line and avoids unnecessary tripping actions caused by unreasonable threshold settings, thereby further improving the power generation efficiency of the photovoltaic power station.

[0065] Figure 2 This is a schematic diagram of the structure of a photovoltaic transmission line thermal stabilization and disconnection machine device provided in an embodiment of this application, as shown below. Figure 2 As shown, it includes: a preset module 201, an acquisition module 202, a monitoring module 203, a calculation module 204, and an execution module 205.

[0066] The preset module 201 is configured to preset overload thresholds, the overload thresholds including a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line. The acquisition module 202 is configured to periodically acquire the real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power station, and sort the real-time cut-off capacity from smallest to largest. The monitoring module 203 is configured to monitor the total power of multiple outgoing lines in real time and determine whether an outgoing line tripping event has occurred and the number of trips. The calculation module 204 is configured to calculate the first power difference to be cut when a single outgoing line trips and the total power before the trip is greater than the first overload threshold, and to calculate the second power difference to be cut when two outgoing lines trip and the total power before the trip is greater than the second overload threshold. The execution module 205 is configured to select a collector line combination whose cut-off capacity is greater than or equal to the required cut-off power difference and is closest to the required cut-off power difference as a target combination, and execute the cut-off of the collector lines in the target combination.

[0067] It should be noted that other corresponding descriptions of the functional units involved in the photovoltaic transmission line thermal stabilization and disconnection machine device provided in this embodiment can be found in the following references. Figure 1 The corresponding descriptions in [the document] will not be repeated here.

[0068] Based on the above, Figure 1 The method for thermal stabilization and disconnection of photovoltaic transmission lines is shown in the figure. Correspondingly, this embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described method. Figure 1 The method for thermal stabilization and cutting of photovoltaic transmission lines is shown.

[0069] Based on the above, Figure 1 The method for thermal stabilization and disconnection of photovoltaic transmission lines is shown. Correspondingly, this embodiment also provides a computer program product, on which a computer program is stored. When the computer program is executed by a processor, it implements the above-described method. Figure 1 The method for thermal stabilization and cutting of photovoltaic transmission lines is shown.

[0070] Based on this understanding, the technical solution of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause a computer device (such as personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of this application.

[0071] Based on the above, Figure 1 A method for thermal stabilization and disconnection of photovoltaic transmission lines is shown, and Figure 2 To achieve the above objectives, the present application also provides an electronic device, such as a personal computer or a server, in the illustrated virtual device embodiment. This device includes a storage medium and a processor; the storage medium stores a computer program; the processor executes the computer program to implement the above-described virtual device. Figure 1 The method for thermal stabilization and cutting of photovoltaic transmission lines is shown.

[0072] In some embodiments, the aforementioned physical device may further include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, an input unit such as a keyboard, etc., and optionally, a USB interface, a card reader interface, etc. In some embodiments, the network interface may include a standard wired interface, a wireless interface (such as a Wi-Fi interface), etc.

[0073] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0075] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for thermal stabilization switching of photovoltaic transmission lines, characterized in that, include: A preset overload threshold is provided, which includes a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line. The real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power plant is periodically obtained, and the real-time cut-off capacity is sorted from smallest to largest. Real-time monitoring of the total power of multiple outgoing lines, and determination of whether an outgoing line tripping event has occurred and the number of trips; When a single outgoing line trips and the total power before the trip is greater than the first overload threshold, the first required power difference is calculated. When two outgoing lines trip and the total power before the trip is greater than the second overload threshold, the second required power difference is calculated. Based on the sorted cut-off capacity, a collector line combination with a cut-off capacity greater than or equal to the required cut-off power difference and closest to the required cut-off power difference is selected as the target combination, and the collector lines in the target combination are cut off.

2. The photovoltaic transmission line thermal stabilization and disconnection machine method according to claim 1, characterized in that, When selecting a target combination, if there are multiple collector line combinations whose cut-off capacity is greater than or equal to the difference in required cut-off power and is closest to the difference in required cut-off power, then the combination with the fewest cut-off collector lines is selected as the target combination.

3. The photovoltaic transmission line thermal stabilization and disconnection machine method according to claim 1, characterized in that, The method for selecting the target combination is as follows: insert the required power cut-off difference into the sequence of cut-off capacities sorted from smallest to largest, and select the collector line combination that is one position after the required power cut-off difference.

4. The photovoltaic transmission line thermal stabilization and disconnection machine method according to claim 1, characterized in that, The combination of all removable collector lines is any non-empty subset of all collector lines in the photovoltaic power station, and the number of combinations is determined by the binomial theorem.

5. The photovoltaic transmission line thermal stabilization and disconnection machine method according to claim 1, characterized in that, The method also includes cutting constraints: When a single outgoing line trips, the number of collector circuits disconnected shall not exceed the preset upper limit. When two outgoing lines trip, at least one collector line shall be kept intact.

6. The photovoltaic transmission line thermal stabilization and disconnection machine method according to claim 1, characterized in that, The first overload threshold is equal to twice the single-circuit control power of the transmission line plus a preset dead zone, and the second overload threshold is equal to the single-circuit control power of the transmission line plus a preset dead zone, wherein the preset dead zone is 0.5MW.

7. A photovoltaic transmission line thermal stabilization disconnection machine device, characterized in that, include: The preset module is configured to preset overload thresholds, which include a first overload threshold corresponding to a single trip of the transmitting line and a second overload threshold corresponding to two trips of the transmitting line. The acquisition module is configured to periodically acquire the real-time cut-off capacity of all cut-off collector line combinations in the photovoltaic power plant, and sort the real-time cut-off capacity from smallest to largest. The monitoring module is configured to monitor the total power of multiple outgoing lines in real time and determine whether an outgoing line tripping event has occurred and the number of trips. The calculation module is configured to calculate the first power difference to be cut when a single outgoing line trips and the total power before the trip is greater than the first overload threshold, and to calculate the second power difference to be cut when two outgoing lines trip and the total power before the trip is greater than the second overload threshold. The execution module is configured to select a collector line combination whose cut-off capacity is greater than or equal to the required cut-off power difference and is closest to the required cut-off power difference as the target combination, and execute the cut-off of the collector lines in the target combination.

8. An electronic device, characterized in that, include: At least one processor; and a memory communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the photovoltaic transmission line thermal stabilization and cutting machine method according to any one of claims 1-6.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the photovoltaic transmission line thermal stabilization and cutting machine method according to any one of claims 1-6.

10. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the photovoltaic transmission line thermal stabilization and disconnection machine method according to any one of claims 1-6.

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