Offshore wind power construction time sequence oriented sea-land collaborative optimization planning method and device

Abstract

The application discloses a kind of sea-land coordination optimization planning method and equipment for offshore wind power construction timing, which comprises the following steps: constructing sea-land coordination planning network; divided into multiple planning stages according to construction timing; enter the current stage; the materialized implementation topology of previous stage is used as the basis network, the onshore construction decision is closed, the timing analysis is executed, and the pressure index is extracted; the restricted candidate corridor set is obtained by screening according to the pressure index score; the loop construction variable is opened and returned, and the construction package is obtained by optimizing with the offshore transmission scheme; the construction package is written back to the basis network to form the materialized implementation topology and perform independent checking; the topology that passes the checking is used as the basis network of next stage, and the above steps are repeated until the whole planning is completed. Based on the method, a sea-land coordination optimization planning equipment for offshore wind power construction timing is also proposed. The application can compress the candidate scale, improve the solving efficiency and engineering implementability, and directly map the optimization result to the line construction package.

Description

Technical Field

[0001] This invention belongs to the field of power system planning technology, and specifically relates to a method and equipment for coordinated land-sea optimization planning for offshore wind power construction sequence. Background Technology

[0002] As offshore wind power development has evolved from single-project, near-shore construction to a more base-based, large-scale, and phased approach, the planning focus has expanded beyond simple submarine cable transmission to encompass the coordinated configuration of offshore sites, landing points, onshore receiving corridors, and construction schedules. For coastal provincial power grids, changes in landing locations and grid connection scale will significantly alter onshore power flow distribution, the location of critical cross-sections, and the priority of subsequent construction plans.

[0003] In existing technologies, one approach separates offshore wind power planning from onshore grid reinforcement. While simple to implement, this approach struggles to accurately reflect the impact of changes in offshore plans on onshore bottleneck migration. Another approach opens up all candidate expansion actions in a unified model at once. While formally more comprehensive, this approach often suffers from problems such as excessively large candidate sizes, decreased solution efficiency, inter-stage iterations, and insufficient interpretability of the results after introducing temporal operational characteristics, multi-stage inheritance constraints, and engineering feasibility requirements. From a practical planning perspective, planners tend to follow a workflow of "first diagnosing pressure channels, then forming annual construction packages, and finally verifying the physical grid structure." Especially in the context of offshore wind power construction timelines, without an explicit inheritance mechanism, subsequent stages can easily overturn previously confirmed projects, leading to unfavorable plans for approval, investment, and construction organization.

[0004] In summary, existing technologies lack a unified framework for a coordinated land-sea optimization planning method that integrates offshore site activation, unique onshore selection, identification of key onshore corridors, parallel loop reinforcement, implementation of topology verification, and stage inheritance. There is an urgent need to propose a coordinated land-sea optimization planning scheme for offshore wind power construction sequence, so as to reduce the candidate scale while ensuring the inheritance relationship between stages, thereby improving solution efficiency and engineering feasibility. Summary of the Invention

[0005] To address the aforementioned technical challenges, this invention proposes a method and equipment for coordinated onshore-offshore optimization planning of offshore wind power construction sequence. It integrates offshore site activation, unique onshore selection, identification of key onshore corridors, parallel loop reinforcement, implementation topology verification, and stage inheritance into a unified framework, outputting a planning scheme that can be directly mapped to an engineering construction package.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Firstly, this invention proposes a land-sea coordinated optimization planning method for offshore wind power construction timing, comprising the following steps: Construct a land-sea coordinated planning network; the land-sea coordinated planning network includes a set of land receiving nodes, a set of existing land corridors, a set of marine candidate sites, and a set of land-sea transmission candidate channels; The offshore wind power construction process is divided into multiple planning phases according to the construction sequence, and each planning phase is implemented sequentially: The physical implementation topology of the previous stage is used as the basic network for the current stage. On the basic network, land construction decisions are turned off, time-series operation analysis is performed, and the pressure indicators of each existing land corridor are extracted. Among them, for the first planning stage, the basic network is a sea-land coordinated planning network. Existing land corridors are scored based on pressure-bearing indicators, and a set of restricted candidate corridors that are allowed to be built at the current stage is obtained. For existing corridors within the limited candidate corridor set, open the parallel loop construction variable and perform collaborative optimization with the marine delivery scheme to obtain the current stage construction package; the parallel loop construction variable is: the number of new parallel loops that have the same starting point and ending point as the existing corridors and inherit the technical attributes of the original corridors; Write the current phase construction package back to the basic network to form the current phase materialized implementation topology, and perform independent verification based on the materialized implementation topology; use the verified materialized implementation topology as the basic network for the next phase, until all planning phases are completed.

[0007] Furthermore, the offshore wind power construction process is divided into multiple planning stages according to the construction sequence, including: accumulating activation of offshore sites in stages. , making up to the The cumulative set of activated offshore sites in each phase equals the previous one. The union of the offshore site subsets of each construction batch ensures that offshore sites activated in the early stages remain effective in subsequent stages.

[0008] Furthermore, the method also includes: applying a unique shore-landing constraint to each active offshore site, expressed as: ; ; ; in, Indicates the index of offshore sites; This indicates that candidate channel indexes are being sent out by both land and sea routes; Indicates offshore site The corresponding set of all feasible sea and land transport candidate channels; Indicates candidate channel In the stage Has the last item already been cumulatively selected? Indicates candidate channel In the stage The state where no one has been cumulatively selected; Indicates the end stage The cumulative set of activated offshore sites.

[0009] Furthermore, the pressure-bearing indicators include overload hour percentage, overload energy proxy value, 95th percentile load factor, peak load factor, and downstream propagation impact, wherein: Overload hours percentage Represented as: ; Overload energy proxy value Represented as: ; 95th percentile load factor Represented as: ; Peak load rate Represented as: ; Downstream transmission impact Represented as: ; in, Indicates the existing land corridor index; Indicates the time-series sample index; This represents the set of time-series samples used to run the analysis; Indicates an indicator function; Indicates the time period on the underlying network corridor Trend value; Indicates corridor In the stage The equivalent transport capacity; Represents the 95th percentile operator; Indicates corridor A set of downstream corridors that are related in terms of topology or power flow; Indicates corridor For the associated corridor Topological or sensitivity weights; Indicates the connection with the corridor Pressure-related load factors increase agency volume.

[0010] Furthermore, the existing land corridors are scored based on pressure-bearing indicators to obtain a set of restricted candidate corridors that are permitted for construction at the current stage; specifically: The pressure indicators are normalized in the current stage, and then the normalized indicators are weighted and summed and the onshore related rewards are added to obtain the corridor comprehensive score. Sort by corridor overall score from highest to lowest, retaining the top rankings. The existing land corridor is the first Phase-restricted candidate corridor set.

[0011] Furthermore, the variables for constructing the parallel loop satisfy the following relationship: ; ; ; ; in, Representation phase In the corridor The number of newly added parallel circuits; Indicates the end stage The cumulative number of newly added circuits; Indicates the end stage The cumulative number of newly added circuits; Representation phase A limited set of candidate corridors; This represents the materialized equivalent transport capacity; Indicates corridor Original conveying capacity without the addition of parallel circuits; This represents the increase in equivalent transmission capacity resulting from each additional parallel circuit. This indicates a collection of existing land-based corridors.

[0012] Furthermore, the collaborative optimization is achieved by minimizing the objective function, which is expressed as: ; in, Indicates the submission of candidate channels by sea Construction costs; Indicates candidate channel In the stage Has the last item already been cumulatively selected? Indicates candidate channel In the stage The state where no one has been cumulatively selected; In the corridor The construction cost of adding a new parallel circuit; Representation phase In the corridor The number of newly added parallel circuits; Indicates the penalty coefficient for unloaded agent quantity; Indicates the index of the land node; Represents a node During the period The unloaded proxy volume; The penalty coefficient represents the amount of wind and electricity curtailment handled by the agent; Represents a node During the period The amount of wind and electricity curtailment handled by the agency; This represents the penalty coefficient for overloaded proxy volume; Represents a node During the period corridor Overloaded proxy volume; This represents the penalty coefficient for slack variables; Representation phase Positive slack variables; Representation phase Negative slack variables.

[0013] Furthermore, the overloaded proxy quantity Represented as: ; in, This indicates the next stage after materializing candidate solutions. Time period corridor Trend value; Indicates corridor In the stage The equivalent transport capacity.

[0014] Furthermore, the independent verification includes: turning off the onshore construction variables on the materialized implementation topology, re-executing the time-series operation calculation, and verifying the power flow load rate, overload conditions, wind curtailment, and the fulfillment of stage targets.

[0015] Secondly, this invention also proposes a land-sea coordinated optimization planning device for offshore wind power construction timing, comprising: At least one processor; A memory coupled to the processor stores a computer program that can be executed by the at least one processor, which, when executed by the at least one processor, causes the at least one processor to execute the aforementioned sea-land coordinated optimization planning method for offshore wind power construction timing.

[0016] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects: This invention proposes a land-sea coordinated optimization planning method and equipment for offshore wind power construction sequence. The method includes the following steps: constructing a land-sea coordinated planning network; the land-sea coordinated planning network includes a set of onshore receiving nodes, a set of existing onshore corridors, a set of offshore candidate sites, and a set of land-sea transmission candidate channels; dividing the offshore wind power construction process into multiple planning stages according to the construction sequence, and executing the following steps for each planning stage: using the physical implementation topology of the previous stage as the basic network of the current stage, disabling onshore construction decisions on the basic network, performing time-series operation analysis, and extracting the stress indicators of each existing onshore corridor; wherein, for the first planning stage, the basic network is a land-sea coordinated planning network. The invention employs a collaborative planning network. Existing land corridors are scored based on pressure-bearing indicators to identify a set of restricted candidate corridors for construction in the current phase. For existing corridors within this restricted candidate set, parallel loop construction variables are opened and optimized collaboratively with the maritime transmission scheme to obtain the current phase construction package. The parallel loop construction variables are defined as the number of newly added parallel loops that share the same starting and ending points as existing corridors and inherit their technical attributes. The current phase construction package is written back to the basic network to form the current phase's materialized implementation topology, and independent verification is performed based on this topology. The verified materialized implementation topology serves as the basic network for the next phase, continuing until all planning phases are completed. Based on this method, corresponding equipment is also proposed. This invention constructs a land-sea collaborative planning network comprising a set of land-based receiving nodes, a set of existing land corridors, a set of maritime candidate sites, and a set of land-sea transmission candidate channels. This integrates the maritime transmission scheme and land-sea grid reinforcement into the same optimization framework, rather than treating them separately. Compared with the existing methods of planning offshore and onshore separately, this invention can more accurately describe the impact of changes in the scale of offshore wind power access on the power flow distribution of the onshore receiving-end grid, the location of key sections with restrictions, and the bottleneck migration path, thus avoiding investment waste and operational risks caused by the disconnect between offshore and onshore planning.

[0017] This invention employs a three-module time-series optimization architecture: initial bottleneck identification, restricted corridor collaborative optimization, and materialized implementation topology verification. Before formal investment decisions are made, land-based construction decisions are disabled on the inherited basic network structure, and only time-series operational analysis is performed to extract the stress-bearing indicators of each existing land corridor. This "diagnosis first, treatment later" process design is fundamentally different from the existing method of opening all candidate expansion actions at once. By first identifying the truly stressed bottleneck channels and then opening construction variables only for the selected restricted candidate corridors, the candidate scale of land-based planning variables can be compressed from all corridors to the top-ranked key corridors, significantly reducing model complexity and improving solution efficiency.

[0018] This invention imposes a unique onshore constraint on each active offshore site, ensuring that it retains only one valid sea-to-land transport candidate channel at any planning stage, and forcing committed onshore solutions to remain valid in subsequent stages. Compared to existing technologies that allow a single site to be split into multiple onshore points, this invention avoids engineering problems such as increased approval complexity, submarine cable routing conflicts, increased operation and maintenance costs, and difficulties in construction organization caused by multiple onshore splits, significantly improving the engineering feasibility of the planning scheme.

[0019] This invention ensures that the previously confirmed parallel circuit construction results remain valid in subsequent stages and are not overturned by subsequent optimizations by setting a non-decreasing state variable for the cumulative number of newly added parallel circuits. Compared with existing methods without explicit inheritance constraints, this stage inheritance mechanism effectively avoids repeated schemes between stages, facilitates the continuous progress of approval, investment, and construction organization, and reduces the risk of additional costs and project delays caused by scheme changes.

[0020] After obtaining the phased construction package, this invention writes the selected construction results back to the basic network to form a materialized implementation topology, and then closes the onshore construction variables and re-executes the time-series calculation to independently verify the power flow load rate, overload conditions, wind and power curtailment, and target fulfillment. Compared with existing technologies that rely solely on the internal constraints of the optimization model without independent verification, the materialized implementation topology verification of this invention can discover the problem of "model feasible but practically infeasible" caused by model simplification, discretization errors, or constraint relaxation, and can trigger re-screening, re-optimization, or manual review, significantly reducing the risk of deviation between the optimized scheme and the actual implementation topology. Attached Figure Description

[0021] Figure 1 This is a diagram of the land-sea coordinated optimization planning architecture for offshore wind power construction sequence proposed in Embodiment 1 of the present invention; Figure 2 This is a flowchart of the land-sea coordinated optimization planning method for offshore wind power construction sequence proposed in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the key corridor scoring and restricted candidate set construction proposed in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the stage inheritance and materialization verification proposed in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the planning of Phase 1 considering time-series planning as proposed in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the second stage planning that considers time-series planning, as proposed in Embodiment 1 of the present invention. Figure 7 This is a schematic diagram of the planning of Phase 3 considering time-series planning proposed in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the time-series planning not considered in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the land-sea coordinated optimization planning equipment for offshore wind power construction sequence proposed in Embodiment 2 of the present invention. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure of the invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components, processing techniques, and processes are omitted in this invention to avoid unnecessarily limiting the invention.

[0023] Example 1 Embodiment 1 of this invention proposes a land-sea collaborative optimization planning method for offshore wind power construction sequence. It incorporates offshore site activation, unique onshore selection, identification of key onshore corridors, parallel loop reinforcement, implementation topology verification and stage inheritance into a unified framework to output a planning scheme that can be directly mapped to an engineering construction package.

[0024] This invention takes the phased cumulative access of offshore wind power as a premise, and places the identification of key corridors driven by time-series operation evidence before the formal investment decision. First, it identifies the truly stressed onshore channels on the inherited basic grid structure. Then, it opens the construction variables of parallel loops with the same starting point and the same ending point only for the selected existing corridors, and performs collaborative optimization with the offshore transmission scheme. Finally, it writes the selected construction actions back to the implementation topology and performs independent verification.

[0025] This forms a time-series optimization architecture consisting of "initial bottleneck identification stage – restricted corridor collaborative optimization stage – materialized implementation topology verification stage". Figure 1 This is a diagram of the sea-land coordinated optimization planning architecture proposed in Embodiment 1 of the present invention for offshore wind power construction sequence; the architecture retains the sea-land coordinated optimization capability and strengthens the interpretability of decision-making, phase consistency and engineering implementation orientation.

[0026] based on Figure 1 The architecture, Figure 2 A flowchart of the land-sea coordinated optimization planning method for offshore wind power construction sequence proposed in Embodiment 1 of the present invention is provided; In step S1, a land-sea collaborative planning network is constructed; the land-sea collaborative planning network includes a set of land receiving nodes, a set of existing land corridors, a set of marine candidate sites, and a set of land-sea sending candidate channels; In step S2, the offshore wind power construction process is divided into multiple planning stages according to the construction sequence; this includes the phased cumulative activation of offshore sites, represented as: (1) in, Indicates the first This phase marks the first time that a subset of offshore sites from the construction batches have entered the planning scope. Indicates the end stage This represents the cumulative set of activated offshore sites. Therefore, sites already activated in the early stages will remain in use in subsequent stages and will not be repeatedly deleted as stages progress. In step S3, proceed to the current stage; for any planning stage, only the offshore sites that have been built or are planned up to that stage are considered as valid nodes, so that the planning status is consistent with the construction pace; In step S4, the materialized implementation topology of the previous stage is used as the basic network of the current stage. On the basic network, the land construction decision is turned off, the time-series operation analysis is performed, and the pressure index of each existing land corridor is extracted. Among them, for the first planning stage, the basic network is the land-sea coordinated planning network. First, the generation of candidate ships for sea and land transport and the unique landing constraint: For each offshore site, multiple candidate onshore landing points can be generated, and a corresponding sea-land transmission channel can be established for each candidate landing point. The technology type of the candidate channel can be pre-marked as AC transmission or DC transmission during the preprocessing stage based on sea-land distance, capacity level, voltage level, cost model, or system operating boundary.

[0027] To avoid increasing the complexity of approval, construction, and operation and maintenance by splitting a single site across multiple landing points, this invention imposes a unique landing constraint on each activated offshore site; for inactive sites, they are prohibited from selecting any sea-to-land delivery candidates in the current stage. For sites that have completed access in the previous stage, their committed landing schemes remain valid in subsequent stages. The unique landing constraint imposed on each activated offshore site is expressed as follows: (2) (3) (4) in, Indicates the index of offshore sites; This indicates that candidate channel indexes are being sent out by both land and sea routes; Indicates offshore site The corresponding set of all feasible sea and land transport candidate channels; Indicates candidate channel In the stage Has the last item already been selected cumulatively? ; Indicates candidate channel In the stage The state where no one has been cumulatively selected; Indicates the end stage The cumulative set of activated offshore sites.

[0028] The above formulas respectively express the unique landing method for activated sites, the prohibition of landing for inactive sites, and the continued validity of committed landing schemes across stages.

[0029] Second, the cumulative access capacity target and phase inheritance. make Indicates offshore site In the stage Cumulative access capacity This indicates the maximum capacity of the site. The site capacity can only be accessed when the corresponding sea / land transmission corridor is selected. For sites already connected in the early stages, their cumulative access capacity will not decrease in subsequent stages.

[0030] Set a cumulative offshore wind power access target for each stage. It also allows setting high-penalty slack variables solely for reachability diagnostics. , Slack variables do not contribute to regular optimization gains; they are only used to identify reasons why a target is unreachable in extreme boundary cases. (5) (6) (7) These three equations, in turn, constrain the upper limit of capacity access, the non-decreasing property of stage inheritance, and the relationship of stage goal satisfaction.

[0031] Third, initial bottleneck identification and critical corridor scoring. Before formal optimization, new land construction decisions are first disabled on the inherited basic grid structure, and only time-series operation analysis is performed to extract the time-series stress indicators of each existing corridor.

[0032] First, in the stage Inherited topology, corridor The equivalent transport capacity is: (8) in, Indicates corridor Original conveying capacity without the addition of parallel circuits; This represents the increase in equivalent transmission capacity resulting from each additional parallel circuit. Indicates the end stage The cumulative number of parallel circuits implemented, and Based on this, the pressure indicators include overload hour percentage, overload energy proxy value, 95th percentile load factor, peak load factor, and downstream propagation impact, among which: Overload hours percentage Represented as: (9) Overload energy proxy value Represented as: (10) 95th percentile load factor Represented as: (11) Peak load rate Represented as: (12) Downstream transmission impact Represented as: (13) in, Indicates the existing land corridor index; Indicates the time-series sample index; This represents the set of time-series samples used to run the analysis; Indicates an indicator function; Indicates the time period on the underlying network corridor Trend value; Indicates corridor In the stage The equivalent transport capacity; Represents the 95th percentile operator; Indicates corridor A set of downstream corridors that are related in terms of topology or power flow; Indicates corridor For the associated corridor Topological or sensitivity weights, ; Indicates the connection with the corridor Pressure-related load factors increase agency volume.

[0033] In step S5, existing land corridors are scored based on pressure bearing capacity indicators to obtain a set of restricted candidate corridors that are allowed to be constructed in the current stage. Figure 3This is a schematic diagram of the key corridor scoring and restricted candidate set construction proposed in Embodiment 1 of the present invention; In order to enable weighted fusion of indices with different dimensions, for any family of indices Perform min-max normalization on the corridor set at the current stage, and the normalized values ​​are... Represented as: (14) in, Indicates the collection of existing land corridors. Indicates the stage Corridor The corresponding normalized result, A very small positive number is set to prevent the normalized denominator from being zero; This represents the difference between the current corridor's index value and the minimum value among all corridors; This represents the difference between the maximum and minimum values ​​in all corridors (plus a very small positive number to avoid division by zero).

[0034] After unifying the notation, the first Phase Corridor The overall score is written as: (15) Representation phase Corridor The overall pressure resistance score; , , , , These represent the weighting coefficients for the five types of pressure-bearing indicators; express The normalized value; express The normalized value; express The normalized value; express The normalized value; express The normalized value; Indicates corridor Is it topologically adjacent to or functionally related to the main onshore power receiving path? This indicates the reward coefficient associated with successfully landing on land; Then retain the overall score. The existing corridor, construct the first Stage-restricted candidate set: (16) in, Representation phase After scoring and filtering, a limited set of candidate corridors is allowed to have open construction variables. This indicates the number of key corridors retained during this phase. Indicates to retain the previous text The filtering operator for named elements. If the overall scores are tied, they can be compared first. Secondly, compare If they are still parallel, they will be processed according to the preset line number order.

[0035] From a technical perspective, More emphasis is placed on persistent bottlenecks. More emphasis is placed on high-cost bottlenecks. More emphasis is placed on normalizing high loads. Used to identify peak risks This is used to reflect the risk of systemic transmission, while Used to increase the priority of nearshore power receiving channels.

[0036] In step S6, for existing corridors within the limited candidate corridor set, the construction variable for parallel loops is opened, and coordinated optimization is performed with the sea delivery scheme to obtain the current stage construction package; the construction variable for parallel loops is: the number of new parallel loops that have the same starting point and ending point as existing corridors and inherit the technical attributes of the original corridors; This invention does not allow for continuous expansion of existing lines, but only permits the addition of parallel loops with the same starting and ending points and inheriting the technical attributes of the original corridors on selected existing corridors. In this way, each land-based decision variable can be directly interpreted as the engineering action of "adding several loops on an existing corridor," which is conducive to forming a clear list of construction packages.

[0037] Representation phase In the corridor The number of newly added parallel circuits; Indicates the end stage If the cumulative number of newly added circuits is equal to the sum of the two, then the two satisfy a recursive inheritance relationship. The variables for parallel circuit construction satisfy the following relationship: (17) (18) (19) in, Indicates the end stage The cumulative number of newly added circuits; Representation phase A limited set of candidate corridors; This represents the materialized equivalent transport capacity; Indicates corridor Original conveying capacity without the addition of parallel circuits; This represents the increase in equivalent transmission capacity resulting from each additional parallel circuit. This indicates a collection of existing land-based corridors.

[0038] To reflect the annual investment pace, construction window, and construction resource constraints, a phase construction package upper limit can be set for the total number of onshore parallel circuits allowed in each phase. .

[0039] (20) This set of formulas respectively constrains phase inheritance, prohibits construction outside the restricted candidate set, updates materialized capabilities, and annual construction pace.

[0040] The objective function comprehensively considers the construction costs of offshore transmission lines, the construction costs of onshore parallel circuits, as well as penalty terms for load shedding, wind and electricity curtailment, line overload surcharges, and target slack, in order to achieve a balance between project cost and operational feasibility.

[0041] ;(twenty one) in, Indicates the submission of candidate channels by sea Construction costs; Indicates candidate channel In the stage Has the last item already been cumulatively selected? Indicates candidate channel In the stage The state where no one has been cumulatively selected; In the corridor The construction cost of adding a new parallel circuit; Representation phase In the corridor The number of newly added parallel circuits; Indicates the penalty coefficient for unloaded agent quantity; Indicates the index of the land node; Represents a node During the period The unloaded proxy volume; The penalty coefficient represents the amount of wind and electricity curtailment handled by the agent; Represents a node During the period The amount of wind and electricity curtailment handled by the agency; This represents the penalty coefficient for overloaded proxy volume; Represents a node During the period corridor Overloaded proxy volume; This represents the penalty coefficient for slack variables; Representation phase Positive slack variables; Representation phase Negative slack variables.

[0042] The first item represents the construction cost of the newly added offshore transmission channel in this phase; the second item represents the construction cost of the onshore parallel circuit in this phase; the third to fifth items correspond to the operational penalties for load shedding, wind and electricity curtailment, and line overload, respectively; and the sixth item is used to impose a high penalty on the relaxation of the phase target.

[0043] Overloaded proxy volume Represented as: ;(twenty two) in, This indicates the next stage after materializing candidate solutions. Time period corridor Trend value; Indicates corridor In the stage The equivalent transport capacity.

[0044] In addition to the objective function mentioned above, this invention also includes conventional operational constraints such as node power balance, sea and land transmission capacity constraints, line transmission capacity constraints, and timing operation boundary constraints, so that the sea transmission and land reinforcement schemes can be jointly evaluated under dynamic operating environment rather than static transmission indicators.

[0045] In step S7, the current stage construction package is written back to the basic network to form the materialized implementation topology of the current stage, and an independent verification is performed based on the materialized implementation topology; the materialized implementation topology that passes the verification is used as the basic network for the next stage, until all planning stages are completed. Figure 4 This is a schematic diagram of the stage inheritance and materialization verification proposed in Embodiment 1 of the present invention; In the stage of obtaining After the formal construction package is completed, the selected offshore transmission results and onshore parallel loop results are written back to the current stage of the network structure to form a materialized implementation topology. Then, new onshore construction decisions are closed, and time-series calculations are re-executed on this materialized implementation topology to independently verify the power flow load rate, overload conditions, wind curtailment, and target fulfillment.

[0046] If the verification result does not meet the preset threshold, it can trigger re-screening, re-optimization, or manual review of the construction package; if the verification passes, the materialized implementation topology will be designated as a phase. The initial network is inherited, thus ensuring the continuity of the scheme between stages.

[0047] The onshore-sea coordinated optimization planning method proposed in Embodiment 1 of this invention, which is oriented towards the construction sequence of offshore wind power, can more accurately describe the impact of changes in the scale of offshore wind power access on the power flow distribution of the onshore receiving-end grid, the restricted location of key sections, and the bottleneck migration path, thus avoiding investment waste and operational risks caused by the disconnect between onshore and offshore planning.

[0048] Example 2 This embodiment 2 provides a specific implementation case of applying the method described in embodiment 1 to a provincial-level land-sea grid interconnection time-series planning scenario. It should be noted that the number of nodes, stage objectives, scoring weights, and construction package limits in this embodiment are only used to illustrate the feasibility of the invention and do not limit the scope of protection of the invention.

[0049] First, the basic configuration of a certain provincial-level implementation example. Table 1: Basic Configuration of a Provincial Implementation Example

[0050] Second, scoring parameters and candidate retention rules In a preferred embodiment, the weights in the critical corridor score can be set as follows: overload hour percentage 0.28, overload energy proxy value 0.30, downstream propagation impact 0.20, 95th percentile load factor 0.14, and peak load factor 0.08, and a near-shore power receiving related reward coefficient is set. =0.12.

[0051] In this workflow, the number of critical corridors retained at each stage The number of reserved corridors can be set to 4, 8, and 12 respectively, and each reserved corridor can generate at most one new parallel loop candidate, so the number of reserved corridors matches the upper limit of the phase's new construction package.

[0052] Third, the cumulative time-series planning results for the third and third phases. Table 2: Three-stage cumulative planning results of a provincial-level implementation

[0053] Figure 5 This is a schematic diagram of the planning of Phase 1 considering time-series planning as proposed in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the second stage planning that considers time-series planning, as proposed in Embodiment 1 of the present invention. Figure 7 This is a schematic diagram of the third stage of the time-series planning proposed in Embodiment 1 of the present invention. These three diagrams illustrate the complete process of a power transmission project (especially a complex system involving offshore wind power and long-distance power transmission) from its initial state, through the first phase of construction, to the phased planning, physical evolution and final form after the completion of the second phase of construction.

[0054] Fourth, comparison with the benchmark scheme that does not consider the inheritance of construction sequence. Table 3: Comparison of key indicators between a provincial-level implementation plan and the benchmark plan

[0055] Figure 8 This is a schematic diagram of the time-series planning not considered in Embodiment 1 of the present invention; through Table 3 and Figure 2 It is evident that the construction sequence using this invention shows a significant improvement in all performance aspects.

[0056] Example 3 Based on the land-sea coordinated optimization planning method for offshore wind power construction sequence proposed in Embodiment 1 of the present invention, and the specific application scenario of the method proposed in Embodiment 2 of the present invention, Embodiment 3 of the present invention also proposes a device. Figure 9 This is a schematic diagram of the land-sea coordinated optimization planning equipment for offshore wind power construction sequence proposed in Embodiment 3 of the present invention.

[0057] At the hardware level, the electronic device 900 includes a processor 910, and optionally, an internal bus 920, a network interface 930, and memory. The memory may include main memory, such as high-speed random-access memory (RAM), or it may also include non-volatile memory, such as at least one disk drive. Of course, the electronic device may also include other hardware required for its functions.

[0058] The processor 910, network interface 930, and memory can be interconnected via an internal bus 920. This internal bus 920 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be categorized as an address bus, data bus, control bus, etc. For ease of illustration, only a single bidirectional arrow is used in this diagram, but this does not imply that there is only one bus or one type of bus. The memory is used to store programs. Specifically, the program can include program code, which includes computer operation instructions. The memory can include main memory 940 and non-volatile memory 950, and provides instructions and data to the processor 910.

[0059] Processor 910 reads the corresponding computer program from non-volatile memory 350 into memory 340 and then runs it, forming a device for locating the target user at the logical level. Processor 910 executes the program stored in memory and specifically performs the following: In step S1, a land-sea collaborative planning network is constructed; the land-sea collaborative planning network includes a set of land receiving nodes, a set of existing land corridors, a set of marine candidate sites, and a set of land-sea sending candidate channels; In step S2, the offshore wind power construction process is divided into multiple planning stages according to the construction sequence; In step S3, proceed to the current stage; for any planning stage, only the offshore sites that have been built or are planned up to that stage are considered as valid nodes, so that the planning status is consistent with the construction pace; In step S4, the materialized implementation topology of the previous stage is used as the basic network of the current stage. On the basic network, the land construction decision is turned off, the time-series operation analysis is performed, and the pressure index of each existing land corridor is extracted. Among them, for the first planning stage, the basic network is the land-sea coordinated planning network. In step S5, existing land corridors are scored based on pressure bearing capacity indicators to obtain a set of restricted candidate corridors that are allowed to be constructed in the current stage. In step S6, for existing corridors within the limited candidate corridor set, the construction variable for parallel loops is opened, and coordinated optimization is performed with the sea delivery scheme to obtain the current stage construction package; the construction variable for parallel loops is: the number of new parallel loops that have the same starting point and ending point as existing corridors and inherit the technical attributes of the original corridors; In step S7, the current stage construction package is written back to the basic network to form the materialized implementation topology of the current stage, and an independent verification is performed based on the materialized implementation topology; the materialized implementation topology that passes the verification is used as the basic network for the next stage, until all planning stages are completed.

[0060] Figure 1It can be applied to processor 910, or implemented by processor 910. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit in the processor or by instructions in the form of software. The processor mentioned above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0061] Of course, in addition to software implementation, the electronic device of this application does not exclude other implementation methods, such as logic devices or a combination of hardware and software, etc. In other words, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0062] The description of the relevant parts of the marine-land coordinated optimization planning equipment for offshore wind power construction timeline provided in Embodiment 3 of this application can be found in the detailed description of the corresponding parts of the marine-land coordinated optimization planning method for offshore wind power construction timeline provided in Embodiment 1 of this application, and will not be repeated here.

[0063] 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 the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, 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 said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0064] While specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art can make other modifications or variations based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A land-sea coordinated optimization planning method for offshore wind power construction sequence, characterized in that, Includes the following steps: Construct a land-sea coordinated planning network; the land-sea coordinated planning network includes a set of land receiving nodes, a set of existing land corridors, a set of marine candidate sites, and a set of land-sea transmission candidate channels; The offshore wind power construction process is divided into multiple planning phases according to the construction sequence, and each planning phase is implemented sequentially: The physical implementation topology of the previous stage is used as the basic network for the current stage. On the basic network, land construction decisions are turned off, time-series operation analysis is performed, and the pressure indicators of each existing land corridor are extracted. Among them, for the first planning stage, the basic network is a sea-land coordinated planning network. Existing land corridors are scored based on pressure-bearing indicators, and a set of restricted candidate corridors that are allowed to be built at the current stage is obtained. For existing corridors within the limited candidate corridor set, open the parallel loop construction variable and perform collaborative optimization with the marine delivery scheme to obtain the current stage construction package; the parallel loop construction variable is: the number of new parallel loops that have the same starting point and ending point as the existing corridors and inherit the technical attributes of the original corridors; Write the current phase construction package back to the basic network to form the current phase materialized implementation topology, and perform independent verification based on the materialized implementation topology; use the verified materialized implementation topology as the basic network for the next phase, until all planning phases are completed.

2. The land-sea coordinated optimization planning method for offshore wind power construction sequence as described in claim 1, characterized in that, The process of offshore wind power construction is divided into multiple planning stages according to the construction sequence, including: accumulating activation of offshore sites in stages. , making up to the The cumulative set of activated offshore sites in each phase equals the previous one. The union of the offshore site subsets of each construction batch ensures that offshore sites activated in the early stages remain effective in subsequent stages.

3. The land-sea coordinated optimization planning method for offshore wind power construction sequence as described in claim 2, characterized in that, The method further includes: applying a unique shore-based constraint to each active offshore site, expressed as: ； ； ； in, Indicates the index of offshore sites; This indicates that candidate channel indexes are being sent out by both land and sea routes; Indicates offshore site The corresponding set of all feasible sea and land transport candidate channels; Indicates candidate channel In the stage Has the last item already been cumulatively selected? Indicates candidate channel In the stage The state where no one has been cumulatively selected; Indicates the end stage The cumulative set of activated offshore sites.

4. The land-sea coordinated optimization planning method for offshore wind power construction sequence as described in claim 1, characterized in that, The pressure-bearing indicators include overload hour percentage, overload energy proxy value, 95th percentile load factor, peak load factor, and downstream propagation impact, among which: Overload hours percentage Represented as: ； Overload energy proxy value Represented as: ； 95th percentile load factor Represented as: ； Peak load rate Represented as: ； Downstream transmission impact Represented as: ； in, Indicates the existing land corridor index; Indicates the time-series sample index; This represents the set of time-series samples used to run the analysis; Indicates an indicator function; Indicates the time period on the underlying network corridor Trend value; Indicates corridor In the stage The equivalent transport capacity; Represents the 95th percentile operator; Indicates corridor A set of downstream corridors that are related in terms of topology or power flow; Indicates corridor For related corridors Topological or sensitivity weights; Indicates the connection with the corridor Pressure-related load factors increase agency volume.

5. The land-sea coordinated optimization planning method for offshore wind power construction sequence as described in claim 1, characterized in that, The existing land corridors are scored based on pressure bearing capacity indicators to obtain a set of restricted candidate corridors that are permitted for construction at the current stage; specifically: The pressure indicators are normalized in the current stage, and then the normalized indicators are weighted and summed and the onshore related rewards are added to obtain the corridor comprehensive score. Based on the overall corridor score, students are ranked from highest to lowest, and the top-ranked students are retained. The existing land corridor is the first Phase-restricted candidate corridor set.

6. The land-sea coordinated optimization planning method for offshore wind power construction sequence according to claim 4, characterized in that, The variables for constructing the parallel circuit satisfy the following relationship: ； ； ； ； in, Representation phase In the corridor The number of newly added parallel circuits; Indicates the end stage The cumulative number of newly added circuits; Indicates the end stage The cumulative number of newly added circuits; Representation phase A limited set of candidate corridors; This represents the materialized equivalent transport capacity; Indicates corridor Original conveying capacity without the addition of parallel circuits; This represents the increase in equivalent transmission capacity resulting from each additional parallel circuit. This indicates a collection of existing land-based corridors.

7. The land-sea coordinated optimization planning method for offshore wind power construction sequence as described in claim 6, characterized in that, The collaborative optimization is achieved by minimizing the objective function, which is expressed as: ； in, Indicates the submission of candidate channels by sea Construction costs; Indicates candidate channel In the stage Has the last item already been cumulatively selected? Indicates candidate channel In the stage The state where no one has been cumulatively selected; In the corridor The construction cost of adding a new parallel circuit; Representation phase In the corridor The number of newly added parallel circuits; This represents the penalty coefficient for unloaded agent quantity; Indicates the index of the land node; Represents a node During the period The unloaded proxy volume; The penalty coefficient represents the amount of wind and electricity curtailment handled by the agent; Represents a node During the period The amount of wind and electricity curtailment handled by the agency; This represents the penalty coefficient for overloaded proxy volume; Represents a node During the period corridor Overloaded proxy volume; This represents the penalty coefficient for slack variables; Representation phase Positive slack variables; Representation phase Negative slack variables.

8. The land-sea coordinated optimization planning method for offshore wind power construction sequence according to claim 7, characterized in that, The overload proxy Represented as: ； in, Indicates the next stage after materializing candidate solutions. Time period corridor Trend value; Indicates corridor In the stage The equivalent transport capacity.

9. The land-sea coordinated optimization planning method for offshore wind power construction sequence according to claim 1, characterized in that, The independent verification includes: turning off the onshore construction variables on the materialized implementation topology, re-executing the time-series operation calculation, and verifying the power flow load rate, overload conditions, wind curtailment, and the fulfillment of stage targets.

10. A land-sea coordinated optimization planning device for offshore wind power construction sequence, characterized in that, include: At least one processor; A memory coupled to the processor stores a computer program executable by the at least one processor, which, when executed by the at least one processor, causes the at least one processor to perform the land-sea coordinated optimization planning method for offshore wind power construction timing as described in any one of claims 1 to 9.

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