CN112241816A

CN112241816A - Power transmission line planning method and device and electronic equipment

Info

Publication number: CN112241816A
Application number: CN202011175139.1A
Authority: CN
Inventors: 但扬清; 孙可; 兰洲; 朱艳伟; 林振智; 孙飞飞; 沈志恒; 周林; 朱克平; 黄亦昕; 沈舒仪; 王曦冉; 李帆; 杨莉
Original assignee: Zhejiang University ZJU; Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd; Economic and Technological Research Institute of State Grid Zhejiang Electric Power Co Ltd; Zhejiang Huayun Electric Power Engineering Design Consulting Co
Current assignee: Zhejiang University ZJU; Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd; Economic and Technological Research Institute of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-01-19

Abstract

The application discloses a method, a device and electronic equipment for planning a power transmission line, wherein operation scenes with serious blockage of the power transmission network are screened through the utilization rate of the power transmission line for relieving the blockage based on planning data of the power transmission network, the planning of the power transmission line is not realized by only depending on a highest load operation scene and a typical operation scene, but the power transmission line with the minimum planning cost is planned according to the screened operation scenes, and therefore the accuracy of the planning of the power transmission line is improved.

Description

Power transmission line planning method and device and electronic equipment

Technical Field

The present application relates to the field of power system technologies, and in particular, to a method and an apparatus for planning a power transmission line, and an electronic device.

Background

In order to meet the requirements of social and economic development and environmental protection, renewable energy sources such as wind power, hydropower, solar power generation and the like are developed rapidly. Renewable energy is accessed to the power supply side and the load side of the power grid in a centralized or distributed mode, the access proportion is continuously improved, the energy structure optimization process is effectively promoted, and sustainable development is facilitated. After the renewable energy source with intermittent and fluctuating output characteristics is connected into the power grid on a large scale, the structure and the operation mode of a power system are deeply influenced, and the specific expression is as follows: the method comprises the following steps of changing power flow distribution of a power grid, improving uncertainty of node load requirements containing distributed renewable energy sources, enhancing fluctuation of node output containing centralized renewable energy sources and the like.

In the existing power transmission network planning scheme, the power transmission network planning scheme is realized based on a highest load operation scene and a typical operation scene, and the uncertain influence of grid connection on a power system when the permeability of renewable energy is low is ignored, so that a new operation scene occurring after the permeability of renewable energy is improved is not considered, and the condition that a rule scheme for capacity expansion decision of a power transmission line in the output power transmission network planning scheme is inaccurate is caused.

Therefore, a technical scheme capable of accurately planning the power transmission line is needed.

Disclosure of Invention

In view of this, the present application provides a method, an apparatus and an electronic device for planning a power transmission line, including:

a method of power transmission line planning, the method comprising:

obtaining current planning data of the power transmission network, wherein the current planning data comprise current line data, current load data and current power generation data, and the current line data at least comprise starting and ending nodes and established lines in a plurality of power transmission channels;

respectively constructing a corresponding power flow operation model under each preset initial operation scene at least according to the current planning data, wherein the power flow operation model takes at least the generating power of the generating set and the response power of the demand side equipment as decision variables and takes the operation cost value under the corresponding initial operation scene as an optimization target;

respectively optimizing the power flow operation model corresponding to each initial operation scene to obtain a power flow planning result corresponding to the minimum power flow cost value in each initial operation scene, wherein the power flow planning result at least comprises: target power flow data of each circuit in each power transmission channel;

according to the target power flow data, obtaining the power transmission line utilization rate of the power transmission network in each initial operation scene, wherein the power transmission line utilization rate is characterized by comprising the following steps: to mitigate the probability of blocking each of the power transmission channels from being utilized in the initial operational scenario;

according to the utilization rate of the power transmission line, screening out a target operation scene which meets a preset serious blocking condition from a plurality of initial operation scenes;

according to the target operation scene, the power transmission planning model is constructed, and the power transmission planning model at least takes whether each circuit in each power transmission channel is established as a decision variable and takes a planning cost value of the power transmission network as an optimization target;

optimizing the power transmission planning model to obtain a corresponding power transmission line planning result when the planning cost value is minimum, wherein the power transmission line planning result at least comprises: and (4) a planning result of whether each circuit in each power transmission channel in the power transmission network is constructed or not.

The above method, preferably, further comprises:

comparing the power transmission line planning result with the current line data to obtain a comparison result;

under the condition that the comparison result represents that the power transmission line planning result is not matched with the established line in the current line data, the established line in the current line data is modified according to the power transmission line planning result, and the steps are executed again: and respectively constructing a corresponding power flow operation model under each preset initial operation scene at least according to the current planning data until the power transmission line planning result is matched with the established line in the current line data.

Preferably, in the method, according to the utilization rate of the power transmission line, a target operation scene meeting a preset severe blocking condition is screened out from a plurality of initial operation scenes, and the method includes:

according to the utilization rate of the power transmission line, obtaining the comprehensive utilization rate of the power transmission line corresponding to each initial operation scene, wherein the comprehensive utilization rate of the power transmission line is characterized by comprising the following steps: to mitigate a combined probability of blocking all of the power transmission channels in the power transmission network from being utilized in the initial operational scenario;

obtaining a scene planning benefit value of each initial operation scene according to the comprehensive utilization rate of the power transmission line and the occurrence probability of each initial operation scene;

and screening out a target operation scene with the scene planning benefit value meeting a preset serious blocking condition from a plurality of initial operation scenes.

Preferably, the method for meeting the scene planning benefit value under the preset severe blocking condition includes:

and the scene planning benefit value is larger than a preset severe blocking scene planning benefit threshold value.

In the method, preferably, the power transmission planning model further takes a planning stage corresponding to the determined construction of each circuit in each power transmission channel as a decision variable.

Preferably, the method for optimizing the power transmission planning model to obtain the power transmission line planning result corresponding to the minimum planning cost value includes:

optimizing the power transmission planning model to obtain a corresponding power transmission line planning result when the planning cost value is minimum in each planning stage;

wherein, the electric transmission line planning result at least comprises: and in each planning stage, obtaining a planning result of whether each circuit in each power transmission channel in the power transmission network is constructed or not.

In the method, preferably, the power flow operation model has a constraint model, and the constraint model of the power flow operation model is a constraint condition at least regarding a total load of the load system, a line power flow of each circuit in each power transmission channel, a line capacity of each circuit in each power transmission channel, a power generation power of the generator set, a response power of the demand side device, and a voltage phase angle of the balancing node in the initial operation scene.

In the above method, preferably, the power transmission planning model has a constraint model, and the constraint model of the power transmission planning model is a constraint condition at least regarding the number of loops of the line in each power transmission channel, the construction timing of the line in each power transmission channel, the construction state of the line in each power transmission channel, the actual cost value of the power transmission network, the total load of the load system in the target operation scenario, the line load flow of each loop of the line in each power transmission channel, the line capacity of each loop of the line in each power transmission channel, the generated power of the generator set, the response power of the demand side, and the voltage phase angle of the balance node.

A power transmission line planning apparatus, the apparatus comprising:

the data obtaining unit is used for obtaining current planning data of the power transmission network, wherein the current planning data comprise current line data, current load data and current power generation data, and the current line data at least comprise starting and ending nodes and established lines in a plurality of power transmission channels;

the power flow model building unit is used for respectively building a corresponding power flow operation model under each preset initial operation scene at least according to the current planning data, and the power flow operation model at least takes the generating power of the generating set and the response power of the demand side equipment as decision variables and takes the operation cost value under the corresponding initial operation scene as an optimization target;

a power flow model optimization unit, configured to optimize the power flow operation model corresponding to each initial operation scenario respectively to obtain a power flow planning result corresponding to the case where the power flow cost value is the minimum in each initial operation scenario, where the power flow planning result at least includes: target power flow data of each circuit in each power transmission channel;

a utilization rate obtaining unit, configured to obtain, according to the target power flow data, a power transmission line utilization rate of the power transmission network in each of the initial operation scenes, where the power transmission line utilization rate represents: to mitigate the probability of blocking each of the power transmission channels from being utilized in the initial operational scenario;

the scene screening unit is used for screening a target operation scene meeting a preset serious blocking condition from a plurality of initial operation scenes according to the utilization rate of the power transmission line;

a planning model construction unit, configured to construct the power transmission planning model according to the target operation scenario, where the power transmission planning model takes at least whether each circuit in each power transmission channel is established as a decision variable and a planning cost value of the power transmission network as an optimization target;

a planning model optimization unit, configured to optimize the power transmission planning model to obtain a power transmission line planning result corresponding to a minimum planning cost value, where the power transmission line planning result at least includes: and (4) a planning result of whether each circuit in each power transmission channel in the power transmission network is constructed or not.

An electronic device, comprising:

the memory is used for storing an application program and data generated by the running of the application program;

a processor for executing the application to implement:

According to the scheme, in the power transmission line planning method, the power transmission line planning device and the electronic equipment, the planning data such as established lines in a plurality of power transmission channels in the power transmission network are obtained, the corresponding power flow operation models under each preset initial operation scene can be respectively constructed according to the planning data, the power generation power of the generator set and the response power of the demand side equipment are used as decision variables of the power flow operation models, and the operation cost values under the corresponding initial operation scenes are used as optimization targets, so that after the power flow operation models corresponding to each initial operation scene are respectively optimized, the power flow planning result corresponding to the minimum power flow cost value under each initial operation scene can be obtained, and the power flow planning result at the moment at least comprises: target power flow data of each circuit in each power transmission channel is obtained, on the basis, by obtaining the power transmission line utilization rate of the power transmission network in each initial operation scene, target operation scenes meeting preset severe blocking conditions can be screened out in a plurality of initial operation scenes according to the power transmission line utilization rate, therefore, a power transmission planning model which takes whether each circuit in each power transmission channel is established as a decision variable and takes the planning cost value of the power transmission network as an optimization target can be established aiming at the target operation scenes, and after the power transmission planning model is optimized, the corresponding power transmission line planning result with the minimum planning cost value can be obtained, wherein the power transmission line planning results at least comprise: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not. Therefore, in the application, the operation scenes with serious blockage of the power transmission network are screened through the power transmission line utilization rate realized for relieving the blockage based on the planning data of the power transmission network, the power transmission line planning is not realized by only depending on the highest load operation scene and the typical operation scene, but the power transmission line with the minimum planning cost is planned according to the screened operation scenes, and therefore the accuracy of the power transmission line planning is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a flowchart of a power transmission line planning method according to an embodiment of the present application;

fig. 2 is another flowchart of a power transmission line planning method according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a power transmission line planning apparatus according to a second embodiment of the present application;

fig. 4 is another schematic structural diagram of a power transmission line planning apparatus according to a second embodiment of the present application;

fig. 5 is a schematic structural diagram of an electronic device according to a third embodiment of the present application;

fig. 6 is an exemplary diagram of the present application when applied to power grid planning.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, a flowchart of an implementation of a method for planning a power transmission line according to an embodiment of the present disclosure is shown, where the method may be applied to an electronic device capable of performing data processing, such as a computer or a server. The technical scheme in the embodiment is mainly used for improving the accuracy of planning the power transmission line in the power transmission network.

Specifically, the method in this embodiment may include the following steps:

step 101: current planning data for the power transmission network is obtained.

The current planning data may include current line data, current load data, and current power generation data, where the current line data may be understood as network topology data of the power transmission network, where the current line data includes at least start and end nodes in a plurality of power transmission channels and established lines in the power transmission channels, and may also include data such as the number of established lines, susceptances of power transmission lines in the power transmission channels, capacity, line construction costs, and maintenance costs, and the current load data may be understood as load data of the power transmission network, and includes system predicted total loads of each node of the power transmission network in each operation scenario, and the current power generation data may be understood as power generation data of the power transmission network, and includes data such as types, capacities, minimum output (power), and unit power generation quotations of power generator sets corresponding to each node of the power transmission network.

Step 102: and respectively constructing a corresponding power flow operation model under each preset initial operation scene at least according to the current planning data.

The initial operation scene may be understood as an operation scene that may exist in the power transmission network, and in this embodiment, the power flow operation models are respectively constructed for the operation scene that may exist in the power transmission network. Therefore, how many initial operation scenarios the power transmission network may have, and how many power flow operation models are correspondingly constructed in the embodiment.

Specifically, in this embodiment, the power flow operation model corresponding to each initial operation scenario takes at least the generated power of the generator set at each node in the power transmission network and the response power of the demand-side device as decision variables, and takes the operation cost value corresponding to each initial operation scenario as an optimization target.

Furthermore, the corresponding tidal current operation model in each initial operation scene also includes variables such as unit power generation quotation of the generator set of each node in the power transmission network and unit response compensation cost of the demand-side equipment.

In the concrete implementation, the power flow operation model is provided with a constraint model, and the constraint model of the power flow operation model is a constraint condition at least about the total load of a load system, the line power flow of each circuit in each power transmission channel, the line capacity of each circuit in each power transmission channel, the generating power of a generating set, the response power of demand side equipment and the voltage phase angle of a balance node in an initial operation scene.

Step 103: and respectively optimizing the power flow operation model corresponding to each initial operation scene to obtain a power flow planning result corresponding to the minimum power flow cost value under each initial operation scene.

Specifically, in this embodiment, optimizing each power flow operation model means: minimizing the operation cost value output by the power flow operation model, wherein under the condition of minimizing the operation cost, the power flow operation model has an optimal solution, and the optimal solution is a power flow planning result, wherein the optimal solution at least comprises: target power flow data for each circuit in each power transmission channel.

For example, in this embodiment, a commercial solver or the like may be adopted to perform solution optimization on each power flow operation model, so as to obtain target power flow data corresponding to each power flow operation model when the operation cost value of each power flow operation model is the minimum.

The target power flow data may include power flow power of each power transmission channel.

It should be noted that, in this embodiment, solution optimization is performed on each power flow operation model under the condition that the constraint conditions in the constraint model are satisfied.

Step 104: and obtaining the utilization rate of the transmission line of the transmission network in each initial operation scene according to the target power flow data.

Wherein, transmission line utilization ratio representation: to mitigate the probability of blocking each power transmission channel being utilized in an initial operating scenario.

In a specific implementation, the utilization rate of the power transmission line can be calculated according to the power flow power of each power transmission channel in the power transmission network for each initial operation scene. Further, in this embodiment, the initial capacity and the new extension capacity of each power transmission channel may be combined to perform calculation on the basis of the tidal current power of each power transmission channel, so as to obtain the utilization rate of the power transmission line in each initial operating scenario.

Step 105: and screening out a target operation scene meeting a preset serious blocking condition from a plurality of initial operation scenes according to the utilization rate of the power transmission line.

In this embodiment, a parameter value capable of representing the blocking state of each initial operation scene may be calculated through the utilization rate of the power transmission line, and then a target operation scene meeting a severe blocking condition, that is, a severe blocking scene, may be screened out from a plurality of initial operation scenes according to such parameter value.

Specifically, in this embodiment, the target operation scene may be screened out in the following manner:

firstly, according to the utilization rate of the power transmission line, the comprehensive utilization rate of the power transmission line corresponding to each initial operation scene is obtained, and the comprehensive utilization rate of the power transmission line can be characterized as follows: in order to relieve the comprehensive probability that all power transmission channels in the blocked power transmission network in the initial operation scene are utilized, for example, the power transmission line utilization corresponding to the same initial operation scene is summed, so that the comprehensive utilization rate of the power transmission line is obtained;

then, a scene planning benefit value of each initial operation scene is obtained according to the comprehensive utilization rate of the power transmission line and the occurrence probability of each initial operation scene, wherein the scene planning benefit value can represent the blocking state of the power transmission network under the corresponding initial operation scene, such as the states of severe blocking or non-severe blocking, and the like;

and finally, screening out a target operation scene with a scene planning benefit value meeting a preset serious blocking condition from a plurality of initial operation scenes.

Specifically, in this embodiment, it may be determined whether the scene planning benefit value of each initial operation scene meets a preset severe blocking condition, and then the initial operation scenes with the scene planning benefit values meeting the severe blocking condition are screened out as target operation scenes, that is, the severe blocking operation scenes.

For example, in this embodiment, it may be determined whether the scene planning benefit value of the initial operating scene is greater than a preset severe blocking scene planning benefit threshold, and under the condition that the scene planning benefit value is greater than the severe blocking scene planning benefit threshold, the corresponding initial operating scene may be determined as a severe blocking operating scene, so as to implement screening of the severe blocking operating scene.

Step 106: and constructing a power transmission planning model according to the target operation scene.

The power transmission planning model at least takes whether each circuit in each power transmission channel is established as a decision variable and takes a planning cost value of a power transmission network as an optimization target.

Specifically, in the implementation of the power transmission network planning in the embodiment, the operation cost, the transmission line investment cost and the maintenance cost of the power transmission network under the severe blocking scene are minimized. Based on this, in this embodiment, a power transmission planning model is constructed with the planning cost value of the power transmission network as the optimization target, where the planning cost value may be composed of the sum of the operation cost, the investment cost, the maintenance cost, and the like of the power transmission network.

It should be noted that, whether each line in the decision variables is constructed means: and (5) whether the line is subjected to capacity expansion construction or not.

In the specific implementation, the power transmission planning model has a constraint model, and the constraint model of the power transmission planning model is at least a constraint condition about the number of loops of the lines in each power transmission channel, the construction time sequence of the lines in each power transmission channel, the construction state of the lines in each power transmission channel, the actual cost value of the power transmission network, the total load of the load system under a target operation scene, the line load flow of each loop of the lines in each power transmission channel, the line capacity of each loop of the lines in each power transmission channel, the generating power of the generator set, the response power of a demand side, and the voltage phase angle of the balance node.

Step 107: and optimizing the power transmission planning model to obtain a corresponding power transmission line planning result when the planning cost value is minimum.

Specifically, in this embodiment, optimizing the power transmission planning model means: minimizing a planning cost value output by the power transmission planning model, wherein the power transmission planning model has an optimal solution under the condition of minimizing the planning cost value, and the optimal solution is a power transmission line planning result, wherein the optimal solution at least comprises: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not.

It should be noted that whether each line in each transmission channel in the transmission network is constructed or not means: and (4) whether each loop in each power transmission channel in the power transmission network is subjected to capacity expansion construction or not. If the line is built, the expansion construction is carried out on the line, and if the line is not built, the expansion construction is not carried out on the line.

For example, in this embodiment, a commercial solver or other manners may be used to solve and optimize the power transmission planning model, so as to obtain a power transmission line planning result corresponding to the power transmission planning model when the planning cost value of the power transmission planning model is minimum.

It should be noted that, in this embodiment, solution optimization of the power transmission planning model is implemented when the constraint conditions in the constraint model are satisfied.

According to the scheme, in the power transmission line planning method provided by the application, through obtaining planned data such as established lines in a plurality of power transmission channels in a power transmission network, a power flow operation model corresponding to each preset initial operation scene can be respectively constructed according to the planned data, the power generation power of a generator set and the response power of demand-side equipment are used as decision variables of the power flow operation models, and the operation cost value corresponding to the power flow operation models under the initial operation scene is used as an optimization target, so that after the power flow operation model corresponding to each initial operation scene is respectively optimized, a power flow planning result corresponding to the minimum power flow cost value under each initial operation scene can be obtained, and the power flow planning result at the moment at least comprises: target power flow data of each circuit in each power transmission channel is obtained, on the basis, by obtaining the power transmission line utilization rate of the power transmission network in each initial operation scene, target operation scenes meeting preset severe blocking conditions can be screened out in a plurality of initial operation scenes according to the power transmission line utilization rate, therefore, a power transmission planning model which takes whether each circuit in each power transmission channel is established as a decision variable and takes the planning cost value of the power transmission network as an optimization target can be established aiming at the target operation scenes, and after the power transmission planning model is optimized, the corresponding power transmission line planning result with the minimum planning cost value can be obtained, wherein the power transmission line planning results at least comprise: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not. Therefore, in the application, the operation scenes with serious blockage of the power transmission network are screened through the power transmission line utilization rate realized for relieving the blockage based on the planning data of the power transmission network, the power transmission line planning is not realized by only depending on the highest load operation scene and the typical operation scene, but the power transmission line with the minimum planning cost is planned according to the screened operation scenes, and therefore the accuracy of the power transmission line planning is improved.

In one implementation, the following steps may be further included after step 107 in this embodiment, as shown in fig. 2:

step 108: and comparing the power transmission line planning result with the current line data to obtain a comparison result, and executing step 109 under the condition that the comparison result represents that the power transmission line planning result is not matched with the established line in the current line data.

Specifically, in this embodiment, the line determined to be constructed in the power transmission line planning result is matched with the established line in the current line data, so as to obtain a comparison result that can represent whether the line determined to be constructed in the power transmission line planning result has a new expanded line with respect to the established line.

Step 109: and modifying the established lines in the current line data according to the planning result of the power transmission line, and re-executing the step 102, so as to respectively construct the corresponding power flow operation model under each preset initial operation scene according to the modified current planning data again until the planning result of the power transmission line is judged to be matched with the established lines in the current line data in the step 108.

Specifically, in this embodiment, the line determined to be constructed in the power transmission line planning result may be modified to the established line in the current line data, so that the optimized line determined to be constructed is used as a new established line to plan the line of the power transmission network again.

And under the condition that the comparison result represents that the power transmission line planning result is matched with the established line in the current line data, the power transmission line planning result can be directly output.

It should be noted that, if it is determined in the power transmission line planning result that a newly capacity-expanded line exists in the line to be constructed in the power transmission line planning result, compared with the existing line, in step 108, it is determined that a serious blocking scenario still exists in the power transmission network, so that capacity-expanded construction needs to be performed on the line in the power transmission line planning result, and the power transmission line planning result at this time may still be inaccurate, and therefore, in order to further improve the accuracy of line planning, in this embodiment, the line to be constructed in the power transmission line planning result is modified into the existing line in the current line data, and then, the power transmission line planning result of the power transmission network is gradually improved by performing iterative line planning on the power transmission network, and when there is no new line capacity-expanded construction in the power transmission line planning result or there is no serious blocking scenario in which the blocking degree is higher than the power, the optimal planning result of the power transmission network can be obtained, so that the accuracy of the line planning is improved to the maximum extent.

In one implementation, the power transmission planning model further takes a planning stage corresponding to the determined construction of each line in each power transmission channel as a decision variable. For example, the route determines planned stages such as the year or month of construction.

Based on this, when the power transmission planning model is optimized in step 107, the power transmission line planning result corresponding to the minimum planning cost value in each planning stage, such as the power transmission line planning result in the first year and the power transmission line planning result in the second year, etc., can be obtained.

The corresponding transmission line planning result at least comprises: and (5) a planning result of whether each circuit in each power transmission channel in the power transmission network is constructed or not in each planning stage. For example, the planning result of whether each line is established in each power transmission channel in the first year, and the planning result of whether each line is established in each power transmission channel in the second year and other planning years.

Referring to fig. 3, a flowchart of an implementation of the power transmission line planning apparatus provided in the second embodiment of the present application is shown, where the apparatus may be configured in an electronic device capable of performing data processing, such as a computer or a server. The technical scheme in the embodiment is mainly used for improving the accuracy of planning the power transmission line in the power transmission network.

Specifically, the apparatus in this embodiment may include the following units:

a data obtaining unit 301, configured to obtain current planning data of the power transmission network, where the current planning data includes current line data, current load data, and current power generation data, and the current line data at least includes starting and ending nodes and established lines in multiple power transmission channels;

the power flow model building unit 302 is configured to respectively build a power flow operation model corresponding to each preset initial operation scenario at least according to the current planning data, where the power flow operation model takes at least the power generation power of the generator set and the response power of the demand-side device as decision variables and the operation cost value corresponding to the power generation power and the response power of the demand-side device as an optimization target;

a flow model optimizing unit 303, configured to optimize the flow operation model corresponding to each initial operation scenario respectively to obtain a flow planning result corresponding to the case where the flow cost value is the minimum in each initial operation scenario, where the flow planning result at least includes: target power flow data of each circuit in each power transmission channel;

a utilization obtaining unit 304, configured to obtain, according to the target power flow data, a power transmission line utilization of the power transmission network in each initial operation scene, where the power transmission line utilization represents: to mitigate the probability of blocking each power transmission channel from being utilized in the initial operational scenario;

a scene screening unit 305, configured to screen, according to a utilization rate of the power transmission line, a target operation scene that meets a preset severe blocking condition from among a plurality of initial operation scenes;

a planning model construction unit 306, configured to construct a power transmission planning model according to the target operation scenario, where the power transmission planning model takes at least whether each circuit in each power transmission channel is established as a decision variable and a planning cost value of the power transmission network as an optimization target;

a planning model optimizing unit 307, configured to optimize the power transmission planning model to obtain a power transmission line planning result corresponding to a minimum planning cost value, where the power transmission line planning result at least includes: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not.

As can be seen from the foregoing solution, in the power transmission line planning apparatus provided in the second embodiment of the present application, by obtaining planning data such as established lines in a plurality of power transmission channels in a power transmission network, a power flow operation model corresponding to each preset initial operation scenario may be respectively constructed according to the planning data, where the power flow operation models use the generated power of a generator set and the response power of demand-side equipment as decision variables and use the operation cost values of the demand-side equipment in the corresponding initial operation scenarios as optimization targets, and thus, after the power flow operation model corresponding to each initial operation scenario is optimized, a power flow planning result corresponding to each initial operation scenario when the power flow cost value is minimum may be obtained, where the power flow planning result at this time at least includes: target power flow data of each circuit in each power transmission channel is obtained, on the basis, by obtaining the power transmission line utilization rate of the power transmission network in each initial operation scene, target operation scenes meeting preset severe blocking conditions can be screened out in a plurality of initial operation scenes according to the power transmission line utilization rate, therefore, a power transmission planning model which takes whether each circuit in each power transmission channel is established as a decision variable and takes the planning cost value of the power transmission network as an optimization target can be established aiming at the target operation scenes, and after the power transmission planning model is optimized, the corresponding power transmission line planning result with the minimum planning cost value can be obtained, wherein the power transmission line planning results at least comprise: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not. Therefore, in the application, the operation scenes with serious blockage of the power transmission network are screened through the power transmission line utilization rate realized for relieving the blockage based on the planning data of the power transmission network, the power transmission line planning is not realized by only depending on the highest load operation scene and the typical operation scene, but the power transmission line with the minimum planning cost is planned according to the screened operation scenes, and therefore the accuracy of the power transmission line planning is improved.

In one implementation, the apparatus in this embodiment may further include the following units, as shown in fig. 4:

a result matching unit 308 for: comparing the power transmission line planning result with the current line data to obtain a comparison result; under the condition that the comparison result represents that the power transmission line planning result is not matched with the established line in the current line data, the established line in the current line data is modified according to the power transmission line planning result, and the power flow model establishing unit 302 is re-triggered to respectively establish a power flow operation model corresponding to each preset initial operation scene according to the current planning data again until the power transmission line planning result is judged to be matched with the established line in the current line data in the result matching unit 308.

Further, the result matching unit 308 may directly output the power transmission line planning result when it is determined that the comparison result represents that the power transmission line planning result matches the established line in the current line data.

In one implementation, the scene filtering unit 305 is specifically configured to: according to the utilization rate of the power transmission line, obtaining the comprehensive utilization rate of the power transmission line corresponding to each initial operation scene, wherein the comprehensive utilization rate of the power transmission line is characterized by comprising the following steps: to mitigate a combined probability of blocking all of the power transmission channels in the power transmission network from being utilized in the initial operational scenario; obtaining a scene planning benefit value of each initial operation scene according to the comprehensive utilization rate of the power transmission line and the occurrence probability of each initial operation scene; and screening out a target operation scene with the scene planning benefit value meeting a preset serious blocking condition from a plurality of initial operation scenes.

Optionally, the scenario planning benefit value satisfies a preset severe blocking condition, including:

In one implementation, the power transmission planning model further uses a planning stage corresponding to the determined construction of each line in each power transmission channel as a decision variable.

Based on this, the planning model optimization unit 307 is specifically configured to: optimizing the power transmission planning model to obtain a corresponding power transmission line planning result when the planning cost value is minimum in each planning stage; wherein, the electric transmission line planning result at least comprises: and in each planning stage, obtaining a planning result of whether each circuit in each power transmission channel in the power transmission network is constructed or not.

In one implementation, the power flow operation model has a constraint model, and the constraint model of the power flow operation model is a constraint condition at least about a total load of a load system, a line power flow of each circuit in each power transmission channel, a line capacity of each circuit in each power transmission channel, a generating power of a generating set, a response power of demand-side equipment, and a voltage phase angle of a balance node in the initial operation scene.

In one implementation, the power transmission planning model has a constraint model, and the constraint model of the power transmission planning model is a constraint condition at least about the number of loops of the lines in each power transmission channel, the construction timing of the lines in each power transmission channel, the construction state of the lines in each power transmission channel, the actual cost value of the power transmission network, the total load of the load system in the target operation scene, the line flow of each loop of the lines in each power transmission channel, the line capacity of each loop of the lines in each power transmission channel, the generated power of the generator set, the response power of the demand side, and the voltage phase angle of the balance node.

It should be noted that, for the specific implementation of each unit in the present embodiment, reference may be made to the corresponding content in the foregoing, and details are not described here.

Referring to fig. 5, a schematic structural diagram of an electronic device according to a third embodiment of the present disclosure is provided, where the electronic device may be an electronic device capable of performing data processing, such as a computer or a server. The technical scheme in the embodiment is mainly used for improving the accuracy of planning the power transmission line in the power transmission network.

Specifically, the electronic device in this embodiment may include the following structure:

a memory 501 for storing applications and data generated by the applications;

a processor 502 for executing an application to implement:

obtaining current planning data of the power transmission network, wherein the current planning data comprises current line data, current load data and current power generation data, and the current line data at least comprises starting and ending nodes and established lines in a plurality of power transmission channels;

respectively constructing a corresponding power flow operation model under each preset initial operation scene at least according to the current planning data, wherein the power flow operation model at least takes the generating power of the generating set and the response power of the demand side equipment as decision variables and takes the operation cost value under the corresponding initial operation scene as an optimization target;

respectively optimizing the power flow operation model corresponding to each initial operation scene to obtain a power flow planning result corresponding to the minimum power flow cost value under each initial operation scene, wherein the power flow planning result at least comprises: target power flow data of each circuit in each power transmission channel;

according to the target power flow data, obtaining the utilization rate of the power transmission line of the power transmission network in each initial operation scene, wherein the utilization rate of the power transmission line is characterized by comprising the following steps: to mitigate the probability of blocking each power transmission channel from being utilized in the initial operational scenario;

constructing a power transmission planning model according to a target operation scene, wherein the power transmission planning model at least takes whether each circuit in each power transmission channel is established as a decision variable and takes a planning cost value of a power transmission network as an optimization target;

optimizing the power transmission planning model to obtain a corresponding power transmission line planning result when the planning cost value is minimum, wherein the power transmission line planning result at least comprises: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not.

Further, the processor 502 is further configured to: comparing the power transmission line planning result with the current line data to obtain a comparison result; and under the condition that the comparison result represents that the power transmission line planning result is not matched with the established line in the current line data, modifying the established line in the current line data according to the power transmission line planning result, and respectively constructing a corresponding power flow operation model under each preset initial operation scene according to the current planning data until the power transmission line planning result is matched with the established line in the current line data.

As can be seen from the foregoing solution, in an electronic device provided in the third embodiment of the present application, through obtaining planned data such as established lines in a plurality of power transmission channels in a power transmission network, a power flow operation model corresponding to each preset initial operation scenario may be respectively constructed according to the planned data, where the power flow operation models take the generated power of a generator set and the response power of a demand-side device as decision variables and take the operation cost value corresponding to the initial operation scenario as an optimization target, so that after the power flow operation model corresponding to each initial operation scenario is optimized, a power flow planning result corresponding to the smallest power flow cost value in each initial operation scenario may be obtained, and the power flow planning result at this time at least includes: target power flow data of each circuit in each power transmission channel is obtained, on the basis, by obtaining the power transmission line utilization rate of the power transmission network in each initial operation scene, target operation scenes meeting preset severe blocking conditions can be screened out in a plurality of initial operation scenes according to the power transmission line utilization rate, therefore, a power transmission planning model which takes whether each circuit in each power transmission channel is established as a decision variable and takes the planning cost value of the power transmission network as an optimization target can be established aiming at the target operation scenes, and after the power transmission planning model is optimized, the corresponding power transmission line planning result with the minimum planning cost value can be obtained, wherein the power transmission line planning results at least comprise: and (5) planning whether each circuit in each power transmission channel in the power transmission network is constructed or not. Therefore, in the application, the operation scenes with serious blockage of the power transmission network are screened through the power transmission line utilization rate realized for relieving the blockage based on the planning data of the power transmission network, the power transmission line planning is not realized by only depending on the highest load operation scene and the typical operation scene, but the power transmission line with the minimum planning cost is planned according to the screened operation scenes, and therefore the accuracy of the power transmission line planning is improved.

It should be noted that, in the present embodiment, reference may be made to the corresponding contents in the foregoing, and details are not described here.

The following describes the technical solution of the present application in detail with reference to the flowchart shown in fig. 6:

firstly, the technical problem mainly solved by the method is to provide a blocking scene screening and power transmission network extension planning scheme based on the utilization rate of a power transmission line by considering the problem of power transmission network double-layer planning relieved by a power transmission resistor plug. In the overall process, the following technical scheme is adopted in the application:

1. providing a transmission line utilization rate index considering congestion mitigation;

2. providing a blocking scene screening method considering the utilization rate of the power transmission line;

3. and constructing a power transmission network extension planning model considering a severe blocking scene.

Based on the scheme, the method and the device provide the transmission line utilization rate index considering the blockage relieving based on the solving result of the transmission network economic dispatching problem, and can scientifically evaluate the investment benefit of the capacity expansion of the transmission line on the blockage risk relieving of the transmission network and the blockage degree of the transmission network operation scene; the blocking scene screening method considering the utilization rate of the power transmission line can screen key operation scenes reflecting the investment targets of power grid companies, establish a multi-stage extension planning model of the power transmission network, and improve the economy of a planning scheme of the power transmission network while ensuring the planning efficiency of the power grid.

Specifically, in the blocking scene screening and power transmission network extension planning scheme based on the utilization rate of the power transmission line, the implementation process comprises the following detailed steps:

step 1, obtaining relevant planning data required by solving a multi-stage planning problem of the power transmission network, and setting an initial value k of iteration times to be 0;

the relevant planning data required by the multi-stage planning problem of the power transmission network specifically comprises:

a) the planning basic data of the power transmission network comprise power transmission network topology (starting and ending nodes of a power transmission channel and the number of established lines of the power transmission channel), power transmission line susceptance (B)_ij,l) Capacity (S)_ij,l) Line construction costs

Hewei (Chinese character of' He WeiCost of protection

b) And (d) power transmission network load data, which comprises system predicted total load (PD s, b) of each node of the power transmission network under each operation scene.

c) The power generation data of the power transmission network comprises the type and the capacity of the generator set at each node of the power transmission network

Minimum output force

And unit power generation quotation

Step 2, constructing an optimal power flow operation model of a blocking scene screening and power transmission network extension planning method based on the utilization rate of the power transmission line;

the optimal power flow operation model objective function of the blocking scene screening and power transmission network extension planning method based on the utilization rate of the power transmission line is constructed and is expressed by the following formula (1):

in the formula: omega_BThe node is a transmission network node set;

and

the generator set and the demand side resource set are respectively connected with the node b;

and

the generated power and unit generated price of the generator set g connected with the node b under the scene s are respectively provided;

and

respectively representing the response power and the unit response compensation cost of the demand-side resource d connected with the node b under the scene s.

Meanwhile, constructing optimal power flow operation model constraint conditions of the blocking scene screening and power transmission network extension planning method based on the utilization rate of the power transmission line, wherein the optimal power flow operation model constraint conditions comprise the following steps:

(1) the node power balance constraint is expressed by formula (2):

in the formula:

is a set of power transmission channels connected with the node b;

the node is a power transmission line set between the node i and the node j; PD s, b is the total load predicted by the load system of the node b under the scene s; f. of_s,ij,lThe power flow of the first loop line of the power transmission line ij under the scene s is shown.

(2) Line flow constraints, expressed in equation (3):

in the formula: y is_s,ij,lA binary decision variable y of the first loop line construction state between the transmission channels ij under the scene s_s,ij,l1 indicates that the l-th line of the power transmission channel ij is constructed, and conversely indicates that the power transmission channel ij is not constructed; b is_ij,lThe susceptance of the first return line between the power transmission channels ij; theta_s,iAnd theta_s,jThe voltage phase angles of the node i and the node j under the scene s are respectively.

(3) The line capacity constraint is expressed by formula (4):

in the formula: s_ij,lThe maximum transmission power of the first loop line of the transmission line ij.

(4) The generator output constraint is expressed by the formula (5):

in the formula:

and

respectively the minimum and maximum generated power of the generator set g.

(5) The demand side response power constraint is expressed by equation (6):

in the formula:

is the maximum response power of the demand-side resource d connected to node b.

(6) The balanced node phase angle constraint, expressed in equation (7):

θ_s,e＝0 (7)

in the formula: theta_s,eThe voltage phase angle of the balanced node under the scene s.

Step 3, providing a transmission line utilization rate index considering the blockage relieving, wherein the index is shown in the following formula (8):

in the formula: beta is a_ijTo account for transmission line ij utilization for congestion mitigation,

and

respectively considering the power flow power of the transmission line ij when the capacity constraint of the transmission line is not considered and considered;

and

the initial capacity and the new extension capacity of the transmission line ij are respectively.

Step 4, providing a blocking scene screening method considering the utilization rate of the power transmission line, comprising the following steps of:

wherein a scenario planning benefit γ is defined that takes into account congestion mitigation_sThe expression is shown in the following formula (9) and formula (10):

γ_s＝π_sα_s (10)

in the formula: pi_sIs the occurrence probability of scene s; alpha is alpha_sThe comprehensive utilization rate of the transmission line considering the blockage relieving under the scene s is provided.

Scenario planning benefit gamma based on consideration of congestion mitigation_sThe screening method for the severe blocking scene of the power transmission network is provided, and the screening models are respectively shown in the following formula (11):

Ω_c＝{s*|γ_s*＞γ₀} (11)

in the formula: omega_cA scene set of severe blocking of the power transmission network is formed; s is a severe occlusion scene number; gamma ray₀And planning a benefit threshold value for the serious blocking scene.

It should be noted that the occurrence probability of the operation scene of the transmission network is synthesized by considering the scene planning benefit index of the blockage relieving, and the total blockage degree of the transmission network under each operation scene is evaluated. When the planning benefit index of the scene is higher than the planning benefit threshold gamma of the severely blocked scene₀The situation shows that the transmission blocking phenomenon of the scene is serious before planning, and the problem of blocking can be effectively relieved by considering the scene to carry out line expansion during planning, so that the planning benefit is improved, and the scene set is required to be included in a transmission network planning scene set; when the planning benefit index of the scene is lower than the planning benefit threshold gamma of the severely blocked scene₀The situation shows that the transmission blocking phenomenon is light before the scene planning, the safe and economic operation requirement can be met under the target transmission network without considering the scene to carry out planning decision, and the situation can not be brought into a transmission network planning scene set.

Step 5, constructing a power transmission network extension planning model considering a severe blocking scene;

from the perspective of a power grid enterprise, a multi-stage planning model of the power transmission network is established based on a blocking scene screening result considering the utilization rate of the power transmission line, so that the operation cost of the power transmission network under a severe blocking scene, the investment cost of the power transmission line and the maintenance cost are minimized. The operation cost of the power transmission network under the severe blocking scene is converted into annual operation cost by considering the duration of the power transmission network in the planning stage, the investment cost of the power transmission line is converted into annual investment cost through a line investment recovery coefficient, the annual cost of each stage is summed and then converted to obtain a net present value of the total cost, and an objective function expression of the total cost is shown in the following formula (12) -formula (16):

in the formula:

and

the construction cost of the transmission line and the maintenance cost of the transmission line are calculated in the planning stage t;

a severe blocking scene set of a planning stage t;

and

the current-year investment cost and the current-year maintenance cost of the first circuit of the power transmission channel ij are respectively set; x is the number of_t,ij,lA binary construction decision variable, x, for the first loop of the transmission channel ij in the planning phase t _t,ij,l1 represents that the l-th loop of the power transmission channel ij is built in the planning stage t, and conversely represents that no power transmission channel is built; t is the total planning stage number of the power transmission network; t is the planning stage number; zeta_tIs the final value discount coefficient; r is the discount rate; t is_pAnd T_lineThe years of the planning cycle and the capital recovery cycle of the power transmission line respectively; h is the load duration of each planning stage; and sigma is a line investment recovery coefficient.

Meanwhile, the constraint conditions of the power transmission network extension planning model considering the severe blocking scene comprise:

(1) newly-built circuit back number constraint

The number of lines allowed to be built by each transmission line is limited, that is, the sum of binary variables of the construction decision of the first line of the transmission line ij in each planning stage should be smaller than the upper limit of the number of lines which can be newly built, as shown in the following formula (17):

in the formula:

an upper limit of the circuit loop number can be established for the circuit ij.

(2) Transmission line construction timing constraints

For the ith return line of transmission line ij to be built, once built, it cannot be dismantled, as shown in equation (18):

(3) transmission line construction state constraints

Transmission line construction state variable y_t,ij,lConstruction decision variable x of the first return to-be-constructed line of the power transmission line ij in the planning stage t_t,ij,lAnd if the power transmission line is decided to be constructed in the planning period, the construction state variable y of the power transmission line of the line_t,ij,lWill change from 0 to 1 as shown in equation (19):

in the formula: y is_0,ij,lAnd is the initial construction state of the power transmission line.

(4) Annual investment cost constraint of power transmission network

The investment of the power transmission line of the power grid company in each planning stage has budget limit, and the first return of the power transmission line ijBinary construction decision variable (x) of line in planning stage t_t,ij,l) In this regard, as shown in equation (20):

in the formula:

and constructing the maximum budget for the investment of the power transmission line in the planning stage t.

(5) Safe operation constraints for power transmission networks

The power transmission network planning scheme needs to meet safe operation constraints in each planning scene. The severe blocking scene obtained by screening in the step 4 contains load and unit output information which are used as input information of the power transmission network optimization planning problem to assist in forming constraint conditions of the power transmission network optimization planning model. The safe operation constraints of the power transmission network comprise:

a. node power balance constraint, as shown in equation (21):

in the formula:

is a set of power transmission channels connected with the node b;

b. Line-current constraints, as shown in equation (22):

c. Line capacity constraint, as shown in equation (23):

d. Generator output constraints as shown in equation (24):

in the formula:

and

respectively the minimum and maximum generated power of the generator set g.

e. Demand side response power constraint, as shown in equation (25):

in the formula:

f. Balanced node phase angle constraints, as shown in equation (26):

θ_s,e＝0 (26)

Step 6, judging whether the power transmission network planning scheme is updated or not compared with the previous generation planning result, if so, enabling k to be k +1 and returning to the step 2; if not, outputting an optimal power transmission network planning scheme including construction decisions (x) of the power transmission line in each planning stage_t,ij,l) And the required cost (C).

Therefore, in the application, before each generation of planning is developed, the economic scheduling problem under each operation scene needs to be solved based on the existing grid information, the transmission blocking degree of each operation scene is evaluated, and a severe blocking scene set omega is screened and generated_s*And the information is fed back to a planning layer model to simulate the process that operators feed back the blocking risk information of the power transmission network to planners in an actual planning scene, so that the planning layer can develop power transmission network planning considering a serious blocking scene. And the planning layer model takes the serious blocking scene set as a planning scene set to carry out optimization solution, then re-evaluates the risk of the transmission blocking based on the new generation of target network frame, and obtains the optimal planning scheme of the transmission network when no new line investment is carried out or no serious blocking scene with the blocking degree higher than the transmission blocking threshold exists. The power transmission network planning model provided by the invention preferentially relieves the operation risk under the most serious blocking scene in each generation of solution, the serious blocking scene set dynamically changes along with the updating of the network frame configuration scheme, the planning efficiency is improved, the defect that the static planning scene set cannot reflect the change of the transmission resistance blocking risk along with the investment of a power transmission network line is overcome, and the interaction between power network planning and operation is reflected.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for planning a power transmission line, the method comprising:

2. The method of claim 1, further comprising:

3. The method of claim 1, wherein screening out a target operation scenario satisfying a preset severe blocking condition from a plurality of initial operation scenarios according to the transmission line utilization rate comprises:

4. The method of claim 3, wherein the scenario planning benefit value satisfies a preset severe blocking condition, comprising:

5. The method according to claim 1, wherein the power transmission planning model further uses, as decision variables, planning phases corresponding to the determined construction of each line in each power transmission channel.

6. The method of claim 5, wherein optimizing the power transmission planning model to obtain a power transmission line planning result corresponding to the minimum planning cost value comprises:

7. The method according to claim 1, wherein the power flow operation model has a constraint model, and the constraint model of the power flow operation model is a constraint condition at least about total load of a load system, line power flow of each circuit in each transmission channel, line capacity of each circuit in each transmission channel, generating power of a generating set, response power of demand side equipment and voltage phase angle of a balance node in the initial operation scene.

8. The method according to claim 1, wherein the power transmission planning model has a constraint model, and the constraint model of the power transmission planning model is a constraint condition at least regarding the number of loops of the line in each power transmission channel, the construction timing of the line in each power transmission channel, the construction state of the line in each power transmission channel, the actual cost value of the power transmission network, the total load of the load system under the target operation scene, the line flow of each loop of the line in each power transmission channel, the line capacity of each loop of the line in each power transmission channel, the generated power of the generator set, the response power of the demand side, and the voltage phase angle of the balance node.

9. An electric transmission line planning apparatus, characterized in that the apparatus comprises:

10. An electronic device, comprising:

a processor for executing the application to implement: