Cross-regional direct current transmission support auxiliary decision-making system and cross-regional direct current transmission support auxiliary decision-making method

Abstract

The invention discloses a cross-regional direct current power transmission support auxiliary decision-making system. The system comprises an information acquisition module which acquires cross-regional direct current power transmission line information and power to-be-supported quantity of a to-be-supported region; the constraint calculation module generates a first cross-region support constraint based on the cross-region direct current transmission line information, and calculates the standby margin of each region as a second cross-region support constraint; the support path processing module generates all support paths of the to-be-supported area, and sorts the support paths according to a preset support strategy to obtain the sequence of the support paths; the decision generation module calculates the support capability of each support path according to the sequence of each support path, sequentially selects the support capabilities of the support paths according to the sequence of the corresponding support paths, and performs de-weighting accumulation until the power to-be-supported amount of the to-be-supported area is met; and generating a cross-regional DC power transmission support aid decision according to the selected support path. The reliability and the response speed of power grid dispatching are improved.

Description

Technical Field

[0001] This invention relates to the field of power system dispatch automation technology, specifically to a cross-regional DC transmission support auxiliary decision-making system and method. Background Technology

[0002] Affected by factors such as insufficient coal supply and increased uncertainty in new energy output due to extreme weather, multiple regional power grids within the power supply area of ​​the power system are experiencing power shortages, resulting in enormous pressure on the power grid to ensure power supply.

[0003] With the development of new technologies in the power system, the reduction of long-distance DC transmission losses, and the increasingly rapid construction of ultra-high voltage AC / DC interconnected power grids, the integrated balance characteristics of the entire grid are becoming more prominent. Based on the day-ahead dispatch plan for the power grid, and after proper arrangement and optimization, the intraday dispatch plan needs to quickly grasp the cross-regional support capabilities and promptly organize cross-regional support to effectively ensure the safety of the large power grid. Although real-time power grid assessment functions based on key indicators can assist dispatchers in monitoring the regional balance regulation capabilities, they cannot automatically generate cross-regional support strategies when intraday balance tensions occur in various regions of the power system. Dispatchers still need to rely on experience to ensure the balance of the power grid.

[0004] In the process of cross-regional regulation in the power system, it is necessary not only to take into account the stability limits of multiple sections of the power grid, but also to confirm the reserve margin of each region. Current technologies cannot provide reasonable and effective cross-regional support and decision-making assistance through automation to address power supply gaps. Most cross-regional support and decision-making assistance is still based on manual methods. Summary of the Invention

[0005] The purpose of this invention is to provide a cross-regional DC power transmission support decision-making system and method, which improves the reliability and response speed of power grid dispatching.

[0006] To achieve this objective, the present invention provides a cross-regional DC transmission support auxiliary decision-making system, comprising: The information acquisition module is used to collect information on cross-regional DC transmission lines in the power system and the amount of power needed for support in areas of the power system that require support. The constraint calculation module is used to generate a first cross-regional support constraint based on the cross-regional DC transmission line information, and to calculate the reserve margin of each region in the power system as a second cross-regional support constraint. The support path processing module is used to generate all support paths for the area to be supported based on the location information of the area to be supported and the information of DC transmission lines across the area. The module sorts all support paths according to the preset support strategy to obtain the order of each support path. The decision generation module is used to calculate the support capacity of each support path in sequence according to the order of each support path, based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected in sequence according to the order of the corresponding support path and deduplicated and accumulated until the power support amount of the area to be supported is met. The cross-regional DC transmission support auxiliary decision is generated according to the selected support path.

[0007] Preferably, the cross-regional DC transmission line information includes the name of the cross-regional DC transmission line, the sending-end region, the receiving-end region, the maximum transmission power, the minimum transmission power, the number of converters, the number of converters supporting emergency support, and the minimum power of the converters.

[0008] Preferably, the specific process for generating the first cross-regional support constraint based on the cross-regional DC transmission line information is as follows: Based on the cross-regional DC transmission line information, a first cross-regional support constraint is generated, which is: in, To enhance cross-regional support capabilities from the sending region to the receiving region. To enhance cross-regional support capabilities from the receiving area to the sending area. This represents the maximum DC transmission capacity of a cross-regional DC transmission line under its current operating mode. The current transmission power from the sending-end area to the receiving-end area. Minimum DC transmission limit for cross-regional DC transmission lines under the current operating mode; Minimum DC transmission limits for inter-regional DC transmission lines under current operating conditions The calculation formula is: in, This represents the minimum power of the converter in a DC transmission line. n This represents the number of converters in a DC transmission line.

[0009] Preferably, the specific process for calculating the reserve margin of each region in the power system as the second inter-regional support constraint is as follows: The DC transmission support and auxiliary levels are set up, including a first margin level and a second margin level. The first margin level refers to the reserve margin of E times the minimum reserve reserved in the area to maintain the operation of the DC transmission line; the second margin level refers to the reserve margin of the same amount of minimum reserve reserved in the area to maintain the operation of the DC transmission line. The reserve margin of each region in the power system is used as the second inter-regional support constraint, which is as follows: in, ; in, This represents the ultra-short-term balance margin within the region. This represents the maximum adjustable output of all directly adjustable thermal power units within the region. i The serial number of the direct-regulation thermal power unit; This represents the maximum adjustable output of all directly adjustable hydropower units within the region. j This refers to the serial number of the direct-regulation hydroelectric generator unit; Contributing to ultra-short-term forecasting of wind power, Contribute to ultra-short-term forecasting for photovoltaics; For ultra-short-term load forecasting of the system; Contribute to the link line project; This serves as the minimum reserve within the region.

[0010] Preferably, the specific process for generating all support paths for the area to be supported based on the location information of the area to be supported and the information of cross-regional DC transmission lines is as follows: Based on the area to be supported and the information of the cross-regional DC transmission lines, a set of first DC transmission lines directly associated with the area to be supported is obtained, and a first associated area is generated based on the area where the other end of the first DC transmission line falls. Obtain a set of second DC transmission lines directly associated with the first associated region, determine the connection relationship through the first associated region where the second DC transmission line and the first DC transmission line are located, generate the transmission direction of the second DC transmission line, and generate a second associated region based on the region where the other end of the second DC transmission line falls, and so on until all DC transmission lines are traversed. Each transmission line in the set of first DC transmission lines is added to the support path of the area to be supported. For each transmission line in the set of second DC transmission lines, a corresponding first DC transmission line is found, and the corresponding lines are connected and added to the support path of the area to be supported. This process is repeated until all DC transmission lines are traversed, thereby generating all support paths for the area to be supported.

[0011] Preferably, the specific process of sorting all support paths according to a preset support strategy to obtain the order of each support path is as follows: The support paths are pre-sorted based on the number of DC transmission lines in each path. The fewer DC transmission lines in a support path, the higher its priority. After pre-sorting, the order of the support paths is adjusted according to the current operating mode of the DC transmission lines in each path, and the final order of each support path is obtained.

[0012] Preferably, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint, according to the order of each support path. The support capacity of each support path is then selected sequentially according to the order of the corresponding support paths and accumulated after deduplication until the power support demand of the region to be supported is met. The specific process of generating cross-regional DC transmission support auxiliary decision based on the selected support paths is as follows: The support capacity of each DC transmission line in the set of first DC transmission lines is calculated based on the first cross-regional support constraint and the second cross-regional support constraint. The calculation formula is as follows: in, To enhance the support capabilities of the sending region to the receiving region. This enhances the support capabilities of the receiving region to the sending region. This is the second cross-regional support constraint for the sending region. This is a second cross-regional support constraint for the receiving end region. To enhance cross-regional support capabilities from the sending region to the receiving region. This provides cross-regional support capabilities from the receiving area to the sending area. Similarly, the support capacity of each DC transmission line in the set of second DC transmission lines can be calculated, and finally the support capacity of each DC transmission line in the set of all DC transmission lines can be obtained, thereby calculating the support capacity of each support path. The support capabilities of the support paths are selected sequentially according to the order of the corresponding support paths. If there are identical DC transmission lines in the selected support paths, the support capabilities of the identical DC transmission lines are deduplicated. Then, the support capabilities of the selected support paths are accumulated until they are greater than or equal to the amount of power to be supported in the area to be supported. At this point, the calculation of the support capabilities of subsequent support paths is stopped, and cross-regional DC transmission support auxiliary decision is generated based on the selected support paths.

[0013] A cross-regional DC transmission support auxiliary decision-making method includes the following steps: Collect information on cross-regional DC transmission lines in the power system and the amount of power needed for support in areas of the power system that require support; The first cross-regional support constraint is generated based on the cross-regional DC transmission line information, and the reserve margin of each region in the power system is calculated as the second cross-regional support constraint. Based on the location information of the area to be supported and the information of cross-regional DC transmission lines, all support paths for the area to be supported are generated, and the order of each support path is obtained by sorting all support paths according to the preset support strategy. According to the order of each support path, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected sequentially according to the order of the corresponding support path and deduplicated and accumulated until the power support amount of the area to be supported is met. Cross-regional DC transmission support auxiliary decision is generated based on the selected support path.

[0014] A computer program product includes a computer program that, when executed by a processor, implements the steps of the above-described method.

[0015] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method.

[0016] The beneficial effects of this invention are: This invention, by comprehensively considering the information of cross-regional DC transmission lines in the power system and the reserve margin of each region, automatically finds support paths for the power supply needs of the region to be supported and generates the optimal DC transmission support auxiliary decision. When the power balance in a certain region of the power system is strained, it can assist grid dispatchers in timely grasping the support capabilities of other regions for regions with imbalances, realizing timely perception of abnormal grid balance situations and timely dispatch of abnormal power supply. This invention enhances the stability of DC transmission line operation and improves the reliability and response speed of grid dispatch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 A cross-regional DC power transmission support decision-making system, such as Figure 1 As shown, it includes: The information acquisition module is used to collect information on DC transmission lines that cross regions (each region can be defined by province or autonomous region, and cross regions refer to power supply coordination between different regions in the power system) in the power system (which can be collected through the D5000 basic platform of the new generation smart grid dispatching technology support system in the power system), and the amount of power to be supported in the power system's areas to be supported (the areas to be supported are determined by the power grid monitoring system or manually designated by the power grid dispatchers). This design improves the real-time performance and accuracy of the data by automatically collecting key parameters of DC transmission lines and the amount of power to be supported in the areas to be supported, and avoids decision-making biases caused by incomplete or delayed data. The constraint calculation module is used to generate the first cross-regional support constraint based on the cross-regional DC transmission line information, and calculate the reserve margin of each region in the power system as the second cross-regional support constraint. This design quantifies the complex physical laws of the power grid and the operation safety criteria into specific mathematical models by calculating the transmission capacity constraint of the DC transmission line itself (the first cross-regional support constraint) and the reserve capacity constraint of the regional power grid (the second cross-regional support constraint), thereby improving the reliability of the subsequent generated decisions. The support path processing module is used to generate all support paths for the area to be supported based on the location information of the area to be supported and the information of the DC transmission lines across the area. According to the preset support strategy, all support paths are sorted to obtain the order of each support path. This design can select the theoretically optimal support path sequence by traversing the power grid topology, exhaustively listing all possible support paths, and sorting the support paths, thus providing the optimal choice for strategy generation. The decision generation module is used to calculate the support capacity of each support path in sequence according to the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected in sequence according to the corresponding support path and accumulated after deduplication until the power support amount of the area to be supported is met. Based on the selected support path, a cross-regional DC transmission support auxiliary decision is generated. This design dynamically calculates and accumulates the support capacity of the support path according to the priority of the support path, and subtracts the duplicate calculation of duplicate DC transmission lines through deduplication processing. Thus, under the premise of meeting the power support amount of the area to be supported, the combination of support paths with the lowest total cost is automatically selected, which improves the response speed of power grid dispatch and the scientific nature of decision generation.

[0019] In the above technical solution, the cross-regional DC transmission line information includes the name of the cross-regional DC transmission line, the sending-end region, the receiving-end region, the maximum transmission power, the minimum transmission power, the number of converters, the number of converters supporting emergency support, and the minimum power of the converters; the above design improves the reliability of subsequent decision-making through complete and multi-dimensional DC transmission line information.

[0020] In the above technical solution, the specific process of generating the first cross-regional support constraint based on the cross-regional DC transmission line information is as follows: Based on the cross-regional DC transmission line information, a first cross-regional support constraint is generated, which is: in, To enhance cross-regional support capabilities from the sending region to the receiving region. To enhance cross-regional support capabilities from the receiving area to the sending area. This represents the maximum DC transmission capacity of a cross-regional DC transmission line under its current operating mode. The current transmission power from the sending-end area to the receiving-end area. Minimum DC transmission limit for cross-regional DC transmission lines under the current operating mode; Minimum DC transmission limits for inter-regional DC transmission lines under current operating conditions The calculation formula is: in, This represents the minimum power of the converter in a DC transmission line. n The above design calculates the upper limit of the "positive" support capability for increasing the transmitted power from the sending region to the receiving region through the first cross-regional support constraint, as well as the lower limit of the support capability for the receiving region to feed back power to the sending region when necessary. This allows for a comprehensive assessment of the potential support capability of the DC transmission line in two different power directions, enhancing the flexibility and reliability of decision-making.

[0021] In the above technical solution, the specific process of calculating the reserve margin of each region in the power system as the second cross-regional support constraint is as follows: The DC transmission support and auxiliary levels are set up, including a first margin level and a second margin level. The first margin level refers to the reserve margin of E (E=1.1) times the minimum reserve reserved in the area to maintain the operation of the DC transmission line; the second margin level refers to the reserve margin of the same amount of minimum reserve reserved in the area to maintain the operation of the DC transmission line. The reserve margin of each region in the power system is used as the second inter-regional support constraint, which is as follows: in, ; in, This represents the ultra-short-term balance margin within the region. This represents the maximum adjustable output of all directly adjustable thermal power units within the region. i The serial number of the direct-regulation thermal power unit; This represents the maximum adjustable output of all directly adjustable hydropower units within the region. j This refers to the serial number of the direct-regulation hydroelectric generator unit; Contributing to ultra-short-term forecasting of wind power, Contribute to ultra-short-term forecasting for photovoltaics; For ultra-short-term load forecasting of the system; Contribute to the link line project; This serves as the minimum reserve within the region. In the above design, the first margin level ensures that the DC transmission line can maintain its current operating direction without incurring additional risks, suitable for non-extreme emergency preventative support scenarios. The second margin level, while ensuring its own basic safety needs (meeting the minimum reserve requirement), allocates more reserve resources to cross-regional support. This is achieved through the calculated ultra-short-term balance margin. It accurately reflects the real-time balancing capability of the power grid in the very short term, avoiding misjudgments caused by incomplete or outdated data.

[0022] In the above technical solution, the specific process of generating all support paths for the area to be supported based on the location information of the area to be supported and the information of cross-regional DC transmission lines is as follows: Based on the area to be supported and the information of the cross-regional DC transmission lines, a set of first DC transmission lines directly associated with the area to be supported is obtained, and a first associated area is generated based on the area where the other end of the first DC transmission line falls. Obtain a set of second DC transmission lines directly associated with the first associated region, determine the connection relationship through the first associated region where the second DC transmission line and the first DC transmission line are located, generate the transmission direction of the second DC transmission line, and generate a second associated region based on the region where the other end of the second DC transmission line falls, and so on until all DC transmission lines are traversed. Each transmission line in the set of first DC transmission lines is added to the support path of the area to be supported. For each transmission line in the set of second DC transmission lines, a corresponding first DC transmission line is found, and the corresponding lines are connected and added to the support path of the area to be supported. This process is repeated until all DC transmission lines are traversed, thereby generating all support paths for the area to be supported. The above design realizes an automated and comprehensive global search for all possible support paths, ensuring the optimality and comprehensiveness of the final generated decision and avoiding limitations in vision and subjective bias.

[0023] In the above technical solution, the specific process of sorting all support paths according to the preset support strategy (the preset support strategy includes two types, one of which only considers the length of the support path, also known as the proximity priority strategy; the other strategy makes certain adjustments based on the proximity priority, considering the current operating mode of the DC transmission line in each support path, so as to achieve a local adjustment with higher priority at the sending end without changing the operating mode, i.e., the sending end priority strategy) is as follows: The support paths are pre-sorted based on the number of DC transmission lines in each path. The fewer the number of DC transmission lines in a support path, the higher its priority. After pre-sorting, the order of the support paths is adjusted according to the current operating mode of the DC transmission lines in each path (the current operating mode includes the transmission direction, transmission power, and whether the DC transmission line is in operation; for the pre-sorted support paths, those with the same current direction are given priority to avoid transient problems caused by switching directions). This final order of each support path is obtained. The above design combines the efficiency-first engineering principle with the requirements of safe and stable power grid operation through a preset support strategy, sorting all support paths, which can reduce computational complexity and improve decision-making speed.

[0024] In the above technical solution, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint, according to the order of each support path. The support capacity of each support path is selected sequentially according to the order of the corresponding support paths and deduplicated and accumulated until the power support demand of the area to be supported is met. The specific process of generating cross-regional DC transmission support auxiliary decision based on the selected support paths is as follows: The support capacity of each DC transmission line in the set of first DC transmission lines is calculated based on the first cross-regional support constraint and the second cross-regional support constraint. The calculation formula is as follows: in, To enhance the support capabilities of the sending region to the receiving region. This enhances the support capabilities of the receiving region to the sending region. This is the second cross-regional support constraint for the sending region. This is a second cross-regional support constraint for the receiving end region. To enhance cross-regional support capabilities from the sending region to the receiving region. This provides cross-regional support capabilities from the receiving area to the sending area. Similarly, the support capacity of each DC transmission line in the set of second DC transmission lines can be calculated, and finally the support capacity of each DC transmission line in the set of all DC transmission lines can be obtained, thereby calculating the support capacity of each support path. The support capabilities of the support paths are selected sequentially according to the order of the corresponding support paths. If the selected support paths contain the same DC transmission line, the support capabilities of the same DC transmission line portion are deduplicated. Then, the support capabilities of the selected support paths are accumulated until they are greater than or equal to the power support amount of the area to be supported. At this point, the calculation of the support capabilities of subsequent support paths is stopped. Based on the selected support paths, a cross-regional DC transmission support auxiliary decision is generated. The above design, by calculating the support capability of each support path and selecting them sequentially according to the order of the corresponding support paths, can select the simplest and most efficient support scheme. When multiple selected support paths share the same DC transmission line, the actual support capability of the DC transmission line cannot be reused. Therefore, deduplication is only calculated once during accumulation, avoiding the inflated support capability and decision misjudgment caused by the superposition of DC transmission lines. Finally, a reliable cross-regional DC transmission support auxiliary decision that can respond quickly is automatically generated.

[0025] Example 2 A cross-regional DC transmission support auxiliary decision-making method, such as Figure 2 As shown, information on cross-regional DC transmission lines and the amount of power needed for the areas to be supported are collected; a first cross-regional support constraint is generated based on the cross-regional DC transmission line information, and the reserve margin of each area is calculated as a second cross-regional support constraint; all support paths for the areas to be supported are generated, and the order of each support path is obtained according to the preset support strategy; the support capacity of each support path is calculated according to the order of each support path, and the support capacity of the support paths is selected in sequence according to the corresponding support path and deduplicated and accumulated until the amount of power needed for the areas to be supported is met; and cross-regional DC transmission support auxiliary decision is generated based on the selected support paths.

[0026] The specific methods for DC transmission support auxiliary decision-making include the following steps: Collect information on cross-regional DC transmission lines in the power system and the amount of power needed for support in areas of the power system that require support; The first cross-regional support constraint is generated based on the cross-regional DC transmission line information, and the reserve margin of each region in the power system is calculated as the second cross-regional support constraint. Based on the location information of the area to be supported and the information of cross-regional DC transmission lines, all support paths for the area to be supported are generated, and the order of each support path is obtained by sorting all support paths according to the preset support strategy. According to the order of each support path, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected sequentially according to the order of the corresponding support path and deduplicated and accumulated until the power support amount of the area to be supported is met. Cross-regional DC transmission support auxiliary decision is generated based on the selected support path.

[0027] Example 3 Taking the regions awaiting support—North China, East China, Central China, Northeast China, Northwest China, and Southwest China—as examples: If one end of a DC transmission line falls into the area to be supported, then the DC transmission line itself can be called a support path. Such support paths are constructed into a set S1, which is the set of the first DC transmission lines.

[0028] In S1, there may be one or more DC transmission lines, and the other end of these DC transmission lines may come from different regions. For example, if the current region to be supported is Northeast China, then the first associated region may be North China or other regions.

[0029] Continuing to expand outward from the first associated region, for example, for North China, we can start by looking for related DC transmission lines from North China. At this time, we can obtain a part of the DC transmission lines in the set S2 of the second DC transmission lines. The other end of the DC transmission lines in S2 may come from East China or Northwest China, thus obtaining the second associated region.

[0030] Similarly, we can continue searching downwards from the second associated region to find the set S3 of the third DC transmission line and the third associated region, until we have completed the traversal of all DC transmission lines, and then end this traversal process to obtain all the supporting paths.

[0031] The simplest support path here only includes one DC transmission line. As S2 is searched, a support path can be obtained by linking one DC transmission line in S1 with one DC transmission line in S2. It can be seen that multiple support paths may have some overlapping DC transmission lines, and these DC transmission lines need to be deduplicated in subsequent calculations.

[0032] The generation implementation examples of the two preset support strategies are shown in Table 1: Table 1 Support Strategy Table Each data entry in Table 1 contains one or more DC transmission lines that actually match the sending-end and receiving-end regions. In the proximity-first strategy, the direction of the DC transmission line is not considered, while in the sending-end-first strategy, the consistency between the current operating mode and the transmission direction of the DC transmission line is considered. All supporting paths are obtained according to the order in Table 1.

[0033] If both East China and Northwest China support Northeast China via North China, then the support capacity of the East China → North China → Northeast support path can be calculated as follows: in, To enhance support capabilities from East China to North China. For North China's own reserve margin. This is to limit the capacity of the transmission corridor from North China to Northeast China. Through this calculation formula, two connected DC transmission lines can be connected, and the support capacity of the support path formed by the connection of the two DC transmission lines can be calculated by superposition. The support capability from Northwest China to North China to Northeast China can be calculated as follows: in, For support capabilities from Northwest to Northeast, For North China's own reserve margin. Limited corridor capacity from North China to Northeast China; The calculated support capabilities of the support paths are deduplicated. If multiple support paths contain the same DC transmission line, the support capabilities of the same DC transmission line portion are deduplicated.

[0034] Combining the two formulas above, we obtain the support capabilities of multiple support paths after deduplication: in, This refers to the overall support capability for the entire complex support route, which starts jointly from East China and Northwest China, passes through North China, and finally reaches Northeast China. Similarly, if support for the Northeast is provided from regions such as Central China and Southwest China, it would require a relay effort from at least three regions.

[0035] Since the preset support strategy is to provide support based on the principle of minimizing or simplifying the adjustment steps, if the adjustment needs can be met from North China to Northeast China, then East China and Northwest China will not need to provide further support to Northeast China.

[0036] In addition, in the cross-regional DC transmission support decision-making, if the support capacity of a certain support path or DC transmission line is less than F (F=20MW), it is considered that its regulation capacity is small, and it will no longer be included in the selected support path.

[0037] Example 4 A computer program product includes a computer program that, when executed by a processor, implements the steps of the method described in Embodiment 2.

[0038] Example 5 A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described in Embodiment 2.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A cross-regional DC power transmission support and decision-making system, characterized in that, It includes: The information acquisition module is used to collect information on cross-regional DC transmission lines in the power system and the amount of power needed for support in areas of the power system that require support. The constraint calculation module is used to generate a first cross-regional support constraint based on the cross-regional DC transmission line information, and to calculate the reserve margin of each region in the power system as a second cross-regional support constraint. The support path processing module is used to generate all support paths for the area to be supported based on the location information of the area to be supported and the information of DC transmission lines across the area. The module sorts all support paths according to the preset support strategy to obtain the order of each support path. The decision generation module is used to calculate the support capacity of each support path in sequence according to the order of each support path, based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected in sequence according to the order of the corresponding support path and deduplicated and accumulated until the power support amount of the area to be supported is met. The cross-regional DC transmission support auxiliary decision is generated according to the selected support path.

2. The cross-regional DC transmission support auxiliary decision-making system according to claim 1, characterized in that: The information on the cross-regional DC transmission lines includes the name of the cross-regional DC transmission line, the sending-end region, the receiving-end region, the maximum transmission power, the minimum transmission power, the number of converters, the number of converters supporting emergency support, and the minimum power of the converters.

3. The cross-regional DC transmission support auxiliary decision-making system according to claim 2, characterized in that: The specific process for generating the first cross-regional support constraint based on the cross-regional DC transmission line information is as follows: Based on the cross-regional DC transmission line information, a first cross-regional support constraint is generated, which is: in, To enhance cross-regional support capabilities from the sending region to the receiving region. To enhance cross-regional support capabilities from the receiving area to the sending area. This represents the maximum DC transmission capacity of a cross-regional DC transmission line under its current operating mode. The current transmission power from the sending-end area to the receiving-end area. Minimum DC transmission limit for cross-regional DC transmission lines under the current operating mode; Minimum DC transmission limits for inter-regional DC transmission lines under current operating conditions The calculation formula is: in, This represents the minimum power of the converter in a DC transmission line. n This represents the number of converters in a DC transmission line.

4. The cross-regional DC transmission support auxiliary decision-making system according to claim 1, characterized in that: The specific process for calculating the reserve margin of each region in the power system as the second cross-regional support constraint is as follows: The DC transmission support and auxiliary levels are set up, including a first margin level and a second margin level. The first margin level refers to the reserve margin of E times the minimum reserve reserved in the area to maintain the operation of the DC transmission line; the second margin level refers to the reserve margin of the same amount of minimum reserve reserved in the area to maintain the operation of the DC transmission line. The reserve margin of each region in the power system is used as the second inter-regional support constraint, which is as follows: in, ; in, This represents the ultra-short-term balance margin within the region. This represents the maximum adjustable output of all directly adjustable thermal power units within the region. i The serial number of the direct-regulation thermal power unit; This represents the maximum adjustable output of all directly adjustable hydropower units within the region. j This refers to the serial number of the direct-regulation hydroelectric generator unit; Contributing to ultra-short-term forecasting of wind power, Contribute to ultra-short-term forecasting for photovoltaics; For ultra-short-term load forecasting of the system; Contribute to the link line project; This serves as the minimum reserve within the region.

5. The cross-regional DC transmission support auxiliary decision-making system according to claim 1, characterized in that: The specific process of generating all support paths for the area to be supported based on the location information of the area to be supported and the information of cross-regional DC transmission lines is as follows: Based on the area to be supported and the information of the cross-regional DC transmission lines, a set of first DC transmission lines directly associated with the area to be supported is obtained, and a first associated area is generated based on the area where the other end of the first DC transmission line falls. Obtain a set of second DC transmission lines directly associated with the first associated region, determine the connection relationship through the first associated region where the second DC transmission line and the first DC transmission line are located, generate the transmission direction of the second DC transmission line, and generate a second associated region based on the region where the other end of the second DC transmission line falls, and so on until all DC transmission lines are traversed. Each transmission line in the set of first DC transmission lines is added to the support path of the area to be supported. For each transmission line in the set of second DC transmission lines, a corresponding first DC transmission line is found, and the corresponding lines are connected and added to the support path of the area to be supported. This process is repeated until all DC transmission lines are traversed, thereby generating all support paths for the area to be supported.

6. The cross-regional DC transmission support auxiliary decision-making system according to claim 1, characterized in that: The specific process of sorting all support paths according to the preset support strategy to obtain the order of each support path is as follows: The support paths are pre-sorted based on the number of DC transmission lines in each path. The fewer DC transmission lines in a support path, the higher its priority. After pre-sorting, the order of the support paths is adjusted according to the current operating mode of the DC transmission lines in each path, and the final order of each support path is obtained.

7. The cross-regional DC transmission support auxiliary decision-making system according to claim 5, characterized in that: Following the order of each support path, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of each support path is then selected sequentially according to the corresponding support path order and accumulated after deduplication until the power support demand of the region to be supported is met. The specific process of generating cross-regional DC transmission support auxiliary decision based on the selected support paths is as follows: The support capacity of each DC transmission line in the set of first DC transmission lines is calculated based on the first cross-regional support constraint and the second cross-regional support constraint. The calculation formula is as follows: in, To enhance the support capabilities of the sending region to the receiving region. This enhances the support capabilities of the receiving region to the sending region. This is the second cross-regional support constraint for the sending region. This is a second cross-regional support constraint for the receiving end region. To enhance cross-regional support capabilities from the sending region to the receiving region. This provides cross-regional support capabilities from the receiving area to the sending area. Similarly, the support capacity of each DC transmission line in the set of second DC transmission lines can be calculated, and finally the support capacity of each DC transmission line in the set of all DC transmission lines can be obtained, thereby calculating the support capacity of each support path. The support capabilities of the support paths are selected sequentially according to the order of the corresponding support paths. If there are identical DC transmission lines in the selected support paths, the support capabilities of the identical DC transmission lines are deduplicated. Then, the support capabilities of the selected support paths are accumulated until they are greater than or equal to the amount of power to be supported in the area to be supported. At this point, the calculation of the support capabilities of subsequent support paths is stopped, and cross-regional DC transmission support auxiliary decision is generated based on the selected support paths.

8. A cross-regional DC transmission support auxiliary decision-making method, characterized in that, It includes the following steps: Collect information on cross-regional DC transmission lines in the power system and the amount of power needed for support in areas of the power system that require support; The first cross-regional support constraint is generated based on the cross-regional DC transmission line information, and the reserve margin of each region in the power system is calculated as the second cross-regional support constraint. Based on the location information of the area to be supported and the information of cross-regional DC transmission lines, all support paths for the area to be supported are generated, and the order of each support path is obtained by sorting all support paths according to the preset support strategy. According to the order of each support path, the support capacity of each support path is calculated sequentially based on the first cross-regional support constraint and the second cross-regional support constraint. The support capacity of the support path is selected sequentially according to the order of the corresponding support path and deduplicated and accumulated until the power support amount of the area to be supported is met. Cross-regional DC transmission support auxiliary decision is generated based on the selected support path.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it implements the steps of the method as described in claim 8.

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