Consider different installed capacity scale power grid section quota adjustment method and related device

Abstract

The present application belongs to the technical field of power grid simulation, and discloses a power grid section limit adjustment method considering different installed capacities and a related device; the method comprises the following steps: obtaining an existing power grid network model, calculating the sensitivity of a safety and stability section to each network node in the existing power grid network model; obtaining a future-state power grid network model, calculating the installed capacity difference of each power generation node between the future-state power grid network model and the existing power grid network model; based on the sensitivity of the safety and stability section to each network node and the installed capacity difference of each power generation node, revising the limit of the safety and stability section under the existing power grid network model to obtain the limit of the safety and stability section under the future-state power grid network model. The present application calculates the contribution value of the installed capacity change of each power generation node to the whole network section based on the sensitivity of the section to the unit, and finally generates a network constraint suitable for the new installed capacity scenario, which lays a good foundation for the multi-period and multi-resource simulation of the simulation system.

Description

Technical Field

[0001] This invention belongs to the field of power grid simulation technology, and specifically relates to a method and related device for adjusting the power grid section limit considering different installed capacity scales. Background Technology

[0002] With the introduction of requirements for the construction of new power systems, new energy sources will gradually replace traditional power generation as the main power source in the power system. Future power market development needs to be integrated with the progress of new power system construction and fully consider the need to improve the level of energy structure transformation.

[0003] However, the forward-looking and holistic nature of the new power system significantly increases the complexity of power market construction. A core characteristic of this new power system is the dominance of renewable energy on the supply side. As renewable energy capacity continues to expand, the power balance characteristics evolve, leading to a substantial increase in the uncertainty and variability of the power system. Furthermore, with socio-economic development, load levels and composition will undergo profound changes. This necessitates continuous dynamic adjustments and corrections to the grid structure, making it crucial to develop power market simulation models in advance to identify market patterns and reduce trial-and-error costs.

[0004] Electricity market operation is a long-term, dynamic evolutionary process, influenced by a variety of factors including grid structure, supply and demand, and the external environment. Theoretical analysis alone is insufficient to predict market performance. Therefore, it is necessary to conduct experimental simulations to extrapolate and verify the market's operational effectiveness before its formal operation. Grid models are the foundation for conducting electricity market operation simulations. However, for grid models primarily based on renewable energy sources, there is currently no actual data available. Therefore, the simulation system needs to support the scientific modeling and system construction of future-state, dynamically evolving grids, power sources, and loads.

[0005] To simulate the electricity market under a new power system, the installed capacity ratio of renewable energy units must first be changed. With the continuous expansion of renewable energy installed capacity and the continuous increase in user load levels, the power flowing through the network will also change significantly. Therefore, network constraints need to be adaptively adjusted; otherwise, there may be a phenomenon of "stuck power" where newly added installed capacity cannot be transmitted due to network capacity limits, affecting the normal operation of the electricity market and the absorption of renewable energy generation. However, the adjustments to network constraints must not violate the existing supply and demand system of the power grid. Excessive adjustments will lead to severe distortion of the target power grid simulation scenario, rendering the simulation results worthless.

[0006] The aforementioned power market simulation systems still lack the capability to conduct multi-cycle, multi-market, and multi-energy coupled power market operation experiments from the perspectives of economic and physical operation within a power market environment. Most existing power market simulation systems only conduct scenario simulation experiments based on the physical model of the existing power grid, without considering adaptive corrections to network security constraints after the large-scale integration of new energy units. Therefore, constrained by these constraints, existing simulation systems cannot effectively reflect the supply and demand relationship of the future power system and cannot support new demands such as market model deduction and verification evaluation under the new power system. Summary of the Invention

[0007] The purpose of this invention is to provide a method and related apparatus for adjusting the grid cross-section limit considering different installed capacity scales, so as to solve the technical problem that the existing power market simulation system has poor accuracy in simulating future power grids.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] In a first aspect, the present invention provides a method for adjusting the grid section limit considering different installed capacity scales, comprising:

[0010] Obtain the existing power grid network model and calculate the sensitivity of the safe and stable section to each network node in the existing power grid network model;

[0011] Obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model;

[0012] Based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, the limits of the safe and stable section under the existing power grid network model are revised to obtain the limits of the safe and stable section under the future power grid network model.

[0013] A further improvement of this invention is that, in the step of obtaining an existing power grid network model and calculating the sensitivity of the safety and stability section to each network node in the existing power grid network model, the safety and stability section L is determined by l L Composed of several lines, the sensitivity of unit i's output to the active power flow of the safe and stable cross section L is S. Li for:

[0014]

[0015] Among them, S li It is the sensitivity of the output of unit i to the active power flow of line l.

[0016] A further improvement of this invention is that the step of obtaining the future-state power grid network model and calculating the difference in installed capacity at each power generation node between the future-state power grid network model and the existing power grid network model specifically includes:

[0017] Calculate the generating capacity of the generating nodes in the existing power grid network model;

[0018] Calculate the generating capacity of the generating nodes in the future power grid network model;

[0019] Mapping the generator nodes of the existing power grid network model to the generator nodes of the future power grid network model;

[0020] The difference in installed capacity at each power generation node is calculated based on the mapping results between the future power grid network model and the existing power grid network model.

[0021] A further improvement of this invention is that the step of obtaining the future-state power grid network model and calculating the difference in installed capacity at each power generation node between the future-state power grid network model and the existing power grid network model specifically includes:

[0022] Based on the existing power grid network model, calculate the installed capacity of each power generation node; the existing power grid network model has n a If there are 10 power generation nodes, then the corresponding set of power generation nodes is:

[0023]

[0024] The set of installed capacities P corresponding to power generation nodes Ga for:

[0025]

[0026] In the formula, P Ni For power generation node N i The rated capacity of the connected units;

[0027] After changes occur in the future power grid network model, the installed capacity information of the future power grid network model is filtered, and the installed capacity undertaken by each generating node is calculated; the future power grid network model has n... b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid network model is:

[0028]

[0029] The set of installed capacities P corresponding to power generation nodes Gb for:

[0030]

[0031] A node mapping is performed between the power generation node set in the existing power grid network model and the power generation node set in the future power grid network model. After the mapping is completed, a complete set of power generation nodes is obtained.

[0032] NG ={N1,…,N n} (17)

[0033] In the formula, n represents the number of power generation nodes after mapping, satisfying the following constraints:

[0034]

[0035] Under the complete set of generating nodes in equation (17), the set of installed capacity corresponding to the generating nodes in the two-stage grid is as follows:

[0036]

[0037] According to equation (19), calculate the difference in installed capacity at each generation node between the future power grid network model and the existing power grid network model:

[0038]

[0039] Where, ΔP G The set of differences in installed capacity at power generation nodes, ΔP Nn This represents the difference in installed capacity at the nth power generation node after mapping.

[0040] A further improvement of this invention is that the step of revising the limits of the safe and stable cross-section under the existing power grid network model based on the sensitivity of each network node to the safe and stable cross-section and the difference in installed capacity of each power generation node, to obtain the limits of the safe and stable cross-section under the future power grid network model, specifically includes:

[0041] The safe and stable cross section L is related to the set of power generation nodes N in the power grid. G The sensitivity is:

[0042]

[0043] The sensitivity value is between [-1, 1]. The sensitivity of the safe and stable cross section L to the nth generation node after mapping is expressed as follows: After the installed capacity of the future power grid network model changes, according to equation (20), the generation node N... i Contribution value of limit modification to safe and stable cross section L for:

[0044]

[0045] According to equation (22), the set of power generation nodes N in the power grid is obtained. G Total contribution value of all power generation nodes to the limit modification of the safe and stable section L:

[0046]

[0047] Under the future state power grid network model, the limit for the safe and stable section L is:

[0048] P L1 =P L0 +ΔP L (twenty four)

[0049] Among them, P L0 This is the limit for the safe and stable section L under the existing power grid network model.

[0050] A further improvement of the present invention is that it also includes:

[0051] Based on the limit of safe and stable sections under the future state power grid network model, power simulation is carried out using the future state power grid network model.

[0052] Secondly, the present invention provides a grid section limit adjustment device that takes into account different installed capacity scales, comprising:

[0053] The sensitivity calculation module is used to obtain the existing power grid network model and calculate the sensitivity of the safe and stable section of the existing power grid network model to each network node.

[0054] The installed capacity difference calculation module is used to obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model.

[0055] The limit adjustment module is used to revise the limits of the safe and stable sections under the existing power grid network model based on the sensitivity of each network node to the safe and stable section and the difference in installed capacity of each power generation node, so as to obtain the limits of the safe and stable sections under the future power grid network model.

[0056] A further improvement of this invention is that, in the step of the sensitivity calculation module acquiring the existing power grid network model and calculating the sensitivity of the safe and stable section to each network node in the existing power grid network model, the safe and stable section L is determined by l L Composed of several lines, the sensitivity of unit i's output to the active power flow of the safe and stable cross section L is S. Li for:

[0057]

[0058] Among them, S li It is the sensitivity of the output of unit i to the active power flow of line l.

[0059] A further improvement of this invention is that the step of the installed capacity difference calculation module obtaining the future power grid network model and calculating the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model specifically includes:

[0060] Calculate the generating capacity of the generating nodes in the existing power grid network model;

[0061] Calculate the generating capacity of the generating nodes in the future power grid network model;

[0062] Mapping the generator nodes of the existing power grid network model to the generator nodes of the future power grid network model;

[0063] The difference in installed capacity at each power generation node is calculated based on the mapping results between the future power grid network model and the existing power grid network model.

[0064] A further improvement of this invention is that the step of the installed capacity difference calculation module obtaining the future power grid network model and calculating the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model specifically includes:

[0065] Based on the existing power grid network model, calculate the installed capacity of each power generation node; the existing power grid network model has n a If there are 10 power generation nodes, then the corresponding set of power generation nodes is:

[0066]

[0067] The set of installed capacities P corresponding to power generation nodes Ga for:

[0068]

[0069] In the formula, P Ni For power generation node N i The rated capacity of the connected units;

[0070] After changes occur in the future power grid network model, the installed capacity information of the future power grid network model is filtered, and the installed capacity undertaken by each generating node is calculated; the future power grid network model has n... b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid network model is:

[0071]

[0072] The set of installed capacities P corresponding to power generation nodes Gb for:

[0073]

[0074] A node mapping is performed between the power generation node set in the existing power grid network model and the power generation node set in the future power grid network model. After the mapping is completed, a complete set of power generation nodes is obtained.

[0075] N G={N1,…,N n} (17)

[0076] In the formula, n represents the number of power generation nodes after mapping, satisfying the following constraints:

[0077]

[0078] Under the complete set of generating nodes in equation (17), the set of installed capacity corresponding to the generating nodes in the two-stage grid is as follows:

[0079]

[0080] According to equation (19), calculate the difference in installed capacity at each generation node between the future power grid network model and the existing power grid network model:

[0081]

[0082] Where, ΔP G The set of differences in installed capacity at power generation nodes, ΔP Nn This represents the difference in installed capacity at the nth power generation node after mapping.

[0083] A further improvement of this invention is that: the limit adjustment module, based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, revises the limit of the safe and stable section under the existing power grid network model to obtain the limit of the safe and stable section under the future power grid network model, specifically including:

[0084] The safe and stable cross section L is related to the set of power generation nodes N in the power grid. G The sensitivity is:

[0085]

[0086] The sensitivity value is between [-1, 1]. The sensitivity of the safe and stable cross section L to the nth generation node after mapping is expressed as follows: After the installed capacity of the future power grid network model changes, according to equation (20), the generation node N... i Contribution value of limit modification to safe and stable cross section L for:

[0087]

[0088] According to equation (22), the set of power generation nodes N in the power grid is obtained. G Total contribution value of all power generation nodes to the limit modification of the safe and stable section L:

[0089]

[0090] Under the future state power grid network model, the limit for the safe and stable section L is:

[0091] P L1 =P L0 +ΔP L (twenty four)

[0092] Among them, P L0 This is the limit for the safe and stable section L under the existing power grid network model.

[0093] A further improvement of the present invention is that it also includes:

[0094] The simulation module is used to perform power simulation based on the limit of the safe and stable section under the future power grid network model.

[0095] Thirdly, the present invention provides an electronic device including a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement the aforementioned method for adjusting the grid cross-section limit considering different installed capacity scales.

[0096] Fourthly, the present invention provides a computer-readable storage medium storing at least one instruction, which, when executed by a processor, implements the method for adjusting grid cross-section limits considering different installed capacities.

[0097] Fifthly, the present invention provides a computer program product, the computer program product comprising a computer program / instruction, which, when executed by a processor, implements the aforementioned method for adjusting grid cross-section limits considering different installed capacity scales.

[0098] Compared with the prior art, the present invention has the following unexpected beneficial effects:

[0099] This invention provides a method for adjusting grid cross-section limits considering different installed capacity scales. The method includes: acquiring an existing grid network model and calculating the sensitivity of the safe and stable cross-section to each network node in the existing grid network model; acquiring a future-state grid network model and calculating the difference in installed capacity at each generation node between the future-state grid network model and the existing grid network model; and revising the limits for the safe and stable cross-section under the existing grid network model based on the sensitivity of the safe and stable cross-section to each network node and the difference in installed capacity at each generation node, thereby obtaining the limits for the safe and stable cross-section under the future-state grid network model. This method can map and calculate the changes in the installed capacity of each generation node in the grid under a simulation environment. Based on the cross-section's sensitivity to the generating units, it calculates the contribution of the changes in installed capacity at each generation node to the entire grid cross-section, ultimately generating network constraints adapted to the new installed capacity scenario, laying a solid foundation for multi-period, multi-resource simulation systems.

[0100] Furthermore, this invention integrates all power generation nodes of the existing power grid and the future power grid to generate a total power generation node set. The purpose of this approach is to quickly identify nodes whose installed capacity may change under the two power grid configurations. Alternatively, all nodes of the power grid can be used directly as the set, regardless of whether they have power generation attributes; this method will not affect the accuracy of the final result.

[0101] Furthermore, this invention adjusts the cross-sectional limits based on the sensitivity of cross-sections to nodes. This approach aims to closely integrate with the existing power grid network attributes, considering the impact of all generating nodes on each cross-section. The resulting adjustment reflects the coupling characteristics of the power grid structure. The adjustment of cross-sectional limits can also be performed by batch assigning values ​​to all cross-sections across the entire network. This method ensures that power flow is unrestricted across all cross-sections. Attached Figure Description

[0102] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0103] Figure 1 This is a flowchart illustrating a method for adjusting the power grid section limit considering different installed capacity, as provided in an embodiment of the present invention.

[0104] Figure 2 This is a flowchart illustrating a method for adjusting the power grid section limit considering different installed capacity scales, as provided in another embodiment of the present invention.

[0105] Figure 3 This invention provides a schematic diagram of a power grid section limit adjustment device that takes into account different installed capacity scales.

[0106] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0107] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0108] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0109] This invention addresses the need for power grid model construction in the context of the increasing proportion of new energy sources in the current power market development. It proposes a method for adjusting the network security stability section limit in the simulation and deduction scenario of new power systems, taking into account the rapid growth of the installed capacity of new energy generators. By calculating the sensitivity of the network interruption to the nodes, calculating the changes in the installed capacity of each generator node under different installed capacity scales, and superimposing the contribution of each generator node to the section limit, the final limit of the security stability section is generated.

[0110] Explanation of relevant terms:

[0111] A power grid model is a dataset that meets the application needs of power grid operation monitoring, control, analysis, and calculation, representing the attributes and connections of power grid equipment. Power grid equipment includes: generators, transformers, loads, lines, switches, disconnectors, capacitors, etc.

[0112] New power system: The new power system is a power system that takes ensuring energy and power security as the basic premise, meeting the power demand of economic and social development as the primary goal, maximizing the absorption of new energy sources as the main task, a strong and intelligent grid as the hub platform, and the interaction between power generation, grid, load and storage and multi-energy complementarity as the support. It has the basic characteristics of being clean and low-carbon, safe and controllable, flexible and efficient, intelligent and friendly, and open and interactive.

[0113] Stable section: A set of power flow channels under the constraints of a power grid network. A stable section consists of several designated transmission lines in the network, which are also called the section members of the stable section; the stable section flow power refers to the directed summation of the flow power of the section members. The flow power of the section members is selected in the positive direction and is specified when the section is defined; the stable section limit refers to the maximum power value flowing through the stable section. It is directional, and it is generally believed that the absolute value of the reverse stability limit is equal to the positive stability limit.

[0114] Network constraints: The power flow of each network security stability section must be within the stability section limit.

[0115] Please see Figure 1 As shown, this embodiment of the invention provides a method for adjusting the grid section limit considering different installed capacity scales, including:

[0116] (1) Under the existing power grid installed capacity system, calculate the sensitivity of the safe and stable section to each network node;

[0117] (2) Calculate the difference in installed capacity at each power generation node after the change in the power grid installed capacity system compared with the existing power grid installed capacity system;

[0118] (3) Based on the sensitivity of the safety and stability section to each node and the difference in installed capacity of each node, the adjusted safety and stability section limit is obtained.

[0119] Furthermore, step (1) specifically includes:

[0120] For a power-carrying line, let the two ends of the line be nodes i and j, and the active power flowing through the line be P. ij V i V j Let θ be the bus voltage amplitude at nodes i and j on line i. ij Let θ be the phase angle difference between the bus voltages at points i and j on line i. i With θ j Let g be the phase angle of the bus voltage at nodes i and j; ij b ij Let be the conductance and susceptance of line ij, then the active power flowing through the line is:

[0121] P ij =V i 2 g ij -V i V j g ij cosθ ij -V i V j b ij sinθ ij (1)

[0122] When using the DC power flow method, the following conditions must be met:

[0123] 1)|g ij |<<|b ij |, and have x ij It is the reactance of line ij.

[0124] 2)θ i With θ j The difference is very small, therefore:

[0125]

[0126] 3) The voltage amplitude at each node is equal and equal to the per-unit value of 1.

[0127] Under the premise that the above conditions are met, equation (1) can be written as:

[0128]

[0129] Among them, B ij For x ij The reciprocal of B ij =-b ij ;

[0130] For node i in the network, there is also a node power balance equation:

[0131]

[0132] In the formula, n is the number of power generation nodes in the network. From equations (4) and (5), we can obtain:

[0133]

[0134] Except for the reference node, the above equation holds true for the other n-1 nodes. Therefore, the power system with n nodes has the following system of equations in matrix form:

[0135] [P]=[B'][θ] (7)

[0136] Where P and θ are the n-1 order active power injection and voltage phase angle vectors, respectively, excluding the quantities related to the balancing node as the angle reference point; [B'] is an n*1 matrix.

[0137] According to the formula for the active power of a branch, its incremental form can be written as:

[0138]

[0139] Considering the conditions under which the DC power flow method is applied, equation (8) can be simplified to:

[0140] ΔP ij =B ij Δθ i -B ij Δθ j =H ij,i Δθ i +H ij,j Δθ j (9)

[0141] Wherein, H is defined ij,i =B ij H ij,j =-B ij All branches have power increment equations of the form (9). Representing them in matrix form, we have:

[0142] [ΔP l ]=[H][Δθ] (10)

[0143] Among them, [ΔP l [H] is the active power increment vector of line l, and the elements of matrix [H] are calculated according to equation (9). Considering that the increment of the node voltage phase angle is relative to the slack node, the equation does not include the slack node, and its dimension is n-1. The number of equations contained in equation (10) is equal to the number of branches N. l Substituting equation (7) into equation (10), we get:

[0144] [ΔP l ]=[H][B'] -1 [ΔP]=[S][ΔP] (11)

[0145] Where the dimension of matrix [S] is N l ×(n-1), called the branch active power sensitivity matrix, reflects the impact of the increment of active power injection at the node on the active power of the branch. The corresponding element S in [S] li It is the sensitivity of the output of unit i to the active power flow of line l.

[0146] Assume the safe and stable cross section L is composed of l L If the power supply consists of several lines, then the sensitivity of the unit's output to the active power flow of the safe and stable cross section L is:

[0147]

[0148] The sensitivity value is determined based on the line composition and direction of the safe and stable section.

[0149] Furthermore, step (2) specifically includes:

[0150] 1) Calculate the existing power generation capacity of grid nodes

[0151] Filter the installed capacity information of existing power grids and calculate the installed capacity of each generating node. Assume the existing power grid has n... a If there are 100 power generation nodes, then the set of power generation nodes corresponding to the existing power grid is:

[0152]

[0153] The set of installed capacities P corresponding to power generation nodes Ga for:

[0154]

[0155] In the formula, P Ni For power generation node N i Rated capacity of the connected units.

[0156] 2) Calculate the future power generation capacity of grid nodes

[0157] After changes in the future power grid's installed capacity structure, the installed capacity information of the future power grid is filtered, and the installed capacity undertaken by each generating node is calculated. Let the future power grid have n... b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid is:

[0158]

[0159] The set of installed capacities P corresponding to power generation nodes Gb for:

[0160]

[0161] 3) Grid node mapping

[0162] The elements in the sets of equations (13) and (15) are not completely corresponding; that is, elements in the existing set of power generation nodes in the power grid may not exist in the set of power generation nodes in the future power grid. Similarly, the power generation nodes in the future power grid may be newly added compared to the existing power grid. Therefore, it is necessary to perform node mapping on the power generation nodes of the two stages to construct a complete set that can uniformly represent the power generation nodes of the two stages of the power grid. That is, power generation nodes with the same connection point number are selected in each stage of the power grid and merged into the same node, while power generation nodes that only exist in a single stage of the power grid are regarded as a single node. After the mapping is completed, there is a complete set of power generation nodes for the two stages of the power grid:

[0163] N G ={N1,…,N n} (17)

[0164] In the formula, n represents the number of power generation nodes in the power grid after mapping, which satisfies the following constraints:

[0165]

[0166] Then, under the complete set of power generation nodes in equation (17), the set of installed capacity corresponding to the power generation nodes of each stage is as follows:

[0167]

[0168] In equation (19), if there is a new element compared to the original installed capacity set of a certain stage, then the element is set to 0.

[0169] 4) Calculate the difference in installed capacity of power generation nodes under each stage of the power grid.

[0170] According to equation (19), the difference in loading capacity of each generation node under the two-stage power grid is calculated as follows:

[0171]

[0172] ΔP G This refers to the set of differences in installed capacity at power generation nodes under a two-stage power grid.

[0173] Furthermore, step (3) specifically includes:

[0174] For a safe and stable section L in the power grid, let its stability limit under the existing power grid installed capacity be P. L0Furthermore, the absolute values ​​of the forward and reverse limits are the same. The set N of power generation nodes in the grid obtained through step (1) is... G The sensitivity is:

[0175]

[0176] The sensitivity value is between [-1, 1]. Let L represent the sensitivity of the safe and stable cross section to the nth generation node after mapping. Then, after a change in the grid's installed capacity, according to equation (20), the generation node N... i Contribution value of limit modification to safe and stable cross section L for:

[0177]

[0178] According to equation (22), the set of power generation nodes N in the power grid is obtained. G Total contribution value of all power generation nodes to the limit modification of the safe and stable section L:

[0179]

[0180] Finally, the limit for the safe and stable cross section L under the future power grid can be obtained as follows:

[0181] P L1 =P L0 +ΔP L (twenty four)

[0182] Based on the above explanation of the changes in sensitivity and installed capacity, the sensitivity of the cross section to the power generation node and the difference in the installed capacity of the power generation node between the two stages may both be negative. Therefore, under the future power grid, the stability limit of the safe and stable cross section L may increase or decrease.

[0183] Please see Figure 2 As shown, this embodiment of the invention provides a method for adjusting the grid section limit considering different installed capacity scales, including:

[0184] S1. Obtain the existing power grid network model and calculate the sensitivity of the safe and stable section to each network node in the existing power grid network model;

[0185] S2. Obtain the future state power grid network model and calculate the difference in installed capacity at each power generation node between the future state power grid network model and the existing power grid network model.

[0186] S3. Based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, the limit of the safe and stable section under the existing power grid network model is revised to obtain the limit of the safe and stable section under the future power grid network model.

[0187] In one specific embodiment, in the step of obtaining an existing power grid network model and calculating the sensitivity of the safety and stability section to each network node in the existing power grid network model, the safety and stability section L is determined by l L Composed of several lines, the sensitivity of unit i's output to the active power flow of the safe and stable cross section L is S. Li for:

[0188]

[0189] Among them, S li It is the sensitivity of the output of unit i to the active power flow of line l.

[0190] In one specific embodiment, the step of obtaining the future power grid network model and calculating the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model specifically includes:

[0191] Calculate the generating capacity of the generating nodes in the existing power grid network model;

[0192] Calculate the generating capacity of the generating nodes in the future power grid network model;

[0193] Mapping the generator nodes of the existing power grid network model to the generator nodes of the future power grid network model;

[0194] The difference in installed capacity at each power generation node is calculated based on the mapping results between the future power grid network model and the existing power grid network model.

[0195] In one specific embodiment, the step of obtaining the future power grid network model and calculating the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model specifically includes:

[0196] Based on the existing power grid network model, calculate the installed capacity of each generating node; the existing power grid network model has n a If there are 10 power generation nodes, then the corresponding set of power generation nodes is:

[0197]

[0198] The set of installed capacities P corresponding to power generation nodes Ga for:

[0199]

[0200] In the formula, P Ni For power generation node N i The rated capacity of the connected units;

[0201] After changes occur in the future power grid network model, the installed capacity information of the future power grid network model is filtered, and the installed capacity undertaken by each generating node is calculated; the future power grid network model has n... b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid network model is:

[0202]

[0203] The set of installed capacities P corresponding to power generation nodes Gb for:

[0204]

[0205] A node mapping is performed between the power generation node set in the existing power grid network model and the power generation node set in the future power grid network model. After the mapping is completed, a complete set of power generation nodes is obtained.

[0206] N G ={N1,…,N n} (17)

[0207] In the formula, n represents the number of power generation nodes after mapping, satisfying the following constraints:

[0208]

[0209] Under the complete set of generating nodes in equation (17), the set of installed capacity corresponding to the generating nodes in the two-stage grid is as follows:

[0210]

[0211] According to equation (19), calculate the difference in installed capacity at each generation node between the future power grid network model and the existing power grid network model:

[0212]

[0213] Where, ΔP G The set of differences in installed capacity at power generation nodes, ΔP Nn This represents the difference in installed capacity at the nth power generation node after mapping.

[0214] In one specific implementation, the step of revising the limits of the safe and stable cross-section under the existing power grid network model based on the sensitivity of the safe and stable cross-section to each network node and the difference in installed capacity of each power generation node, to obtain the limits of the safe and stable cross-section under the future power grid network model, specifically includes:

[0215] The safe and stable cross section L is related to the set of power generation nodes N in the power grid. G The sensitivity is:

[0216]

[0217] The sensitivity value is between [-1, 1]. The sensitivity of the safe and stable cross section L to the nth generation node after mapping is expressed as follows: After the installed capacity of the future power grid network model changes, according to equation (20), the generation node N... i Contribution value of limit modification to safe and stable cross section L for:

[0218]

[0219] According to equation (22), the set of power generation nodes N in the power grid is obtained. G Total contribution value of all power generation nodes to the limit modification of the safe and stable section L:

[0220]

[0221] Under the future state power grid network model, the limit for the safe and stable section L is:

[0222] P L1 =P L0 +ΔP L (twenty four)

[0223] Among them, P L0 This is the limit for the safe and stable section L under the existing power grid network model.

[0224] In one specific embodiment, the present invention further includes the following steps:

[0225] S4. Based on the limit of safe and stable sections under the future state power grid network model, power simulation is carried out using the future state power grid network model.

[0226] The method of this invention can map and calculate the changes in the installed capacity of each power generation node in the power grid under the simulation scenario. Based on the sensitivity of the cross section to the unit, it calculates the contribution of the change in the installed capacity of each power generation node to the entire network cross section, and finally generates network constraints that are adapted to the new installed capacity scenario, laying a good foundation for the simulation system to carry out multi-cycle and multi-resource simulation.

[0227] Please see Figure 3 As shown, this embodiment of the invention provides a grid section limit adjustment device that considers different installed capacity scales, including:

[0228] The sensitivity calculation module is used to obtain the existing power grid network model and calculate the sensitivity of the safe and stable section of the existing power grid network model to each network node.

[0229] The installed capacity difference calculation module is used to obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model.

[0230] The limit adjustment module is used to revise the limits of the safe and stable sections under the existing power grid network model based on the sensitivity of each network node to the safe and stable section and the difference in installed capacity of each power generation node, so as to obtain the limits of the safe and stable sections under the future power grid network model.

[0231] Please see Figure 4 As shown, this embodiment of the invention provides an electronic device 100 for implementing a method for adjusting grid cross-section limits considering different installed capacity scales; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0232] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the grid section limit adjustment method considering different installed capacity scales by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0233] The at least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor. The processor 102 is the control center of the electronic device 100, connecting various parts of the electronic device 100 via various interfaces and lines.

[0234] The memory 101 in the electronic device 100 stores multiple instructions to implement grid cross-section limit adjustments considering different installed capacity scales, and the processor 102 can execute the multiple instructions to achieve the following:

[0235] Obtain the existing power grid network model and calculate the sensitivity of the safe and stable section to each network node in the existing power grid network model;

[0236] Obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model;

[0237] Based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, the limits of the safe and stable section under the existing power grid network model are revised to obtain the limits of the safe and stable section under the future power grid network model.

[0238] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0239] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0240] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0241] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0242] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for adjusting the grid section limit considering different installed capacity scales, characterized in that, include: Obtain the existing power grid network model and calculate the sensitivity of the safe and stable section to each network node in the existing power grid network model; Obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model; Based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, the limit of the safe and stable section under the existing power grid network model is revised to obtain the limit of the safe and stable section under the future power grid network model. The steps of obtaining the future power grid network model and calculating the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model specifically include: Based on the existing power grid network model, calculate the installed capacity of each power generation node; the existing power grid network model has... n a If there are 10 power generation nodes, then the corresponding set of power generation nodes is: （13） Set of installed capacities corresponding to power generation nodes for: （14） In the formula, For power generation nodes The rated capacity of the connected units; After changes occur in the future power grid network model, the installed capacity information of the future power grid network model is filtered, and the installed capacity undertaken by each generating node is calculated; the future power grid network model has n b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid network model is: （15） Set of installed capacities corresponding to power generation nodes for: （16） A node mapping is performed between the power generation node set in the existing power grid network model and the power generation node set in the future power grid network model. After the mapping is completed, a complete set of power generation nodes is obtained. （17） In the formula, n To achieve the number of power generation nodes after mapping, the following constraints must be satisfied: （18） Under the complete set of generating nodes in equation (17), the set of installed capacity corresponding to the generating nodes of the grid in the two stages is as follows: （19） According to equation (19), the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model is calculated: （20） in, Set of differences in installed capacity at power generation nodes This represents the difference in installed capacity at the nth power generation node after mapping. The steps of revising the limits of the safe and stable cross-section under the existing power grid network model based on the sensitivity of each network node to the safe and stable cross-section and the difference in installed capacity of each power generation node, to obtain the limits of the safe and stable cross-section under the future power grid network model, specifically include: Safe and stable cross section L For the set of power generation nodes in the power grid The sensitivity is: （21） The sensitivity value is between [-1, 1]. Indicates a safe and stable cross section L Sensitivity of the nth generation node after mapping; after the installed capacity of the future power grid network model changes, according to equation (20), the generation node N i For safe and stable cross sections L Limit modification contribution value for: （22） According to equation (22), the set of power generation nodes in the power grid is obtained. All power generation nodes are related to the safe and stable cross-section L Total contribution value for limit modification: （23） Obtain the safe and stable cross section under the future state power grid network model. L The limit is: （24） in, P L0 For the safe and stable section under the existing power grid network model L The limit.

2. The method for adjusting power grid section limits considering different installed capacity scales according to claim 1, characterized in that, In the step of obtaining an existing power grid network model and calculating the sensitivity of the safe and stable section to each network node in the existing power grid network model, the safe and stable section... L Depend on l L Composed of several lines, the unit i The output of the cross section is related to safety and stability. L Sensitivity of active power flow for: （12） in, It is a generator set i The output of the line The sensitivity of the active current.

3. The method for adjusting the grid section limit considering different installed capacity according to any one of claims 1 to 2, characterized in that, Also includes: Based on the limit of safe and stable sections under the future state power grid network model, power simulation is carried out using the future state power grid network model.

4. A grid section limit adjustment device considering different installed capacity scales, characterized in that, include: The sensitivity calculation module is used to obtain the existing power grid network model and calculate the sensitivity of the safe and stable section of the existing power grid network model to each network node. The installed capacity difference calculation module is used to obtain the future power grid network model and calculate the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model. The limit adjustment module is used to revise the limits of the safe and stable section under the existing power grid network model based on the sensitivity of each network node to the safe and stable section and the difference in installed capacity of each power generation node, so as to obtain the limits of the safe and stable section under the future power grid network model. The steps of the installed capacity difference calculation module to obtain the future power grid network model and calculate the difference in installed capacity at each generation node between the future power grid network model and the existing power grid network model specifically include: Based on the existing power grid network model, calculate the installed capacity of each power generation node; the existing power grid network model has... n a If there are 10 power generation nodes, then the corresponding set of power generation nodes is: （13） Set of installed capacities corresponding to power generation nodes for: （14） In the formula, For power generation nodes The rated capacity of the connected units; After changes occur in the future power grid network model, the installed capacity information of the future power grid network model is filtered, and the installed capacity undertaken by each generating node is calculated; the future power grid network model has n b If there are 100 power generation nodes, then the set of power generation nodes corresponding to the future power grid network model is: （15） Set of installed capacities corresponding to power generation nodes for: （16） A node mapping is performed between the power generation node set in the existing power grid network model and the power generation node set in the future power grid network model. After the mapping is completed, a complete set of power generation nodes is obtained. （17） In the formula, n To achieve the number of power generation nodes after mapping, the following constraints must be satisfied: （18） Under the complete set of generating nodes in equation (17), the set of installed capacity corresponding to the generating nodes of the grid in the two stages is as follows: （19） According to equation (19), the difference in installed capacity at each power generation node between the future power grid network model and the existing power grid network model is calculated: （20） in, Set of differences in installed capacity at power generation nodes This represents the difference in installed capacity at the nth power generation node after mapping. The limit adjustment module, based on the sensitivity of the safe and stable section to each network node and the difference in installed capacity of each power generation node, revises the limits of the safe and stable section under the existing power grid network model to obtain the limits of the safe and stable section under the future power grid network model. The specific steps include: Safe and stable cross section L For the set of power generation nodes in the power grid The sensitivity is: （21） The sensitivity value is between [-1, 1]. Indicates a safe and stable cross section L Sensitivity of the nth generation node after mapping; after the installed capacity of the future power grid network model changes, according to equation (20), the generation node N i For safe and stable cross sections L Limit modification contribution value for: （22） According to equation (22), the set of power generation nodes in the power grid is obtained. All power generation nodes are related to the safe and stable cross-section L Total contribution value for limit modification: （23） Obtain the safe and stable cross section under the future state power grid network model. L The limit is: （24） in, P L0 For the safe and stable section under the existing power grid network model L The limit.

5. The power grid section limit adjustment device considering different installed capacity as described in claim 4, characterized in that, In the step of the sensitivity calculation module acquiring the existing power grid network model and calculating the sensitivity of the safe and stable section to each network node in the existing power grid network model, the safe and stable section... L Depend on l L Composed of several lines, the unit i The output of the cross section is related to safety and stability. L Sensitivity of active power flow for: （12） in, It is a generator set i The output of the line The sensitivity of the active current.

6. The power grid section limit adjustment device considering different installed capacity according to any one of claims 4 to 5, characterized in that, Also includes: The simulation module is used to perform power simulation based on the limit of the safe and stable section under the future power grid network model.

7. An electronic device, characterized in that, It includes a processor and a memory, the processor being used to execute a computer program stored in the memory to implement the grid section limit adjustment method considering different installed capacity as described in any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, which, when executed by a processor, implements the grid section limit adjustment method considering different installed capacity as described in any one of claims 1 to 3.

9. A computer program product, characterized in that, The computer program product includes a computer program / instruction, which, when executed by a processor, implements the grid section limit adjustment method considering different installed capacity as described in any one of claims 1 to 3.

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