A method for constructing a strong local power grid

Abstract

The present invention discloses a method for constructing a strong local power grid. The method includes: establishing a list of important power users; for each important user in the list of important power users, establishing the shortest power supply channel from the user access point to the highest voltage level of the urban power grid; establishing a radial power supply grid framework between the highest voltage level of the power grid and the user access points of each important user; establishing different path channels from a hub substation to the substation of the highest voltage level, and if there are no less than two path channels, selecting the path channel with the shortest power supply distance and superimposing it on the radial power supply grid framework; establishing the shortest power supply channel from the disaster-resistant guarantee power source to the radial power supply grid framework to connect the disaster-resistant guarantee power source to the radial power supply grid framework, forming a power supply grid framework to be evaluated; and forming a strong local power grid based on the power supply grid framework to be evaluated. The present invention can systematically and quickly form a strong local power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and particularly to a method for constructing a strong local power grid. Background Art

[0002] In the past forty-odd years, the frequency of global natural disasters recorded by the International Emergency Disasters Database (EM-DAT) has increased nearly threefold. Against the backdrop of global climate change, rising temperatures and warming climate have exacerbated the frequency of disasters such as heavy precipitation, floods, strong typhoons, and ice and snow disasters, having a significant impact on the normal power consumption for production and living of people.

[0003] Natural disasters are frequent in China. The geographical and social environments vary greatly in different regions, and the natural disasters faced by the power system are also different. The more prominent disasters include typhoons, icing, lightning, earthquakes, etc. The large-scale power outages of the power grid caused by natural disasters have seriously affected the normal life of the people and the stable development of the social economy.

[0004] The strong local power grid is proposed for the extreme faults of the power system caused by severe natural disasters exceeding the defense standards. Starting from ensuring the basic operation of the city and minimizing the social impact, taking special, some first-level and second-level important users as the guarantee objects, selecting relevant substations, lines and local guarantee power sources in the city for differential construction and maintenance, ensuring that the security loads of important users do not lose power, and the non-security loads are quickly restored to power, with the smallest-scale grid framework and the ability of island operation.

[0005] However, at present, there is a lack of clear construction methods and implementation measures for the planning and construction of the strong local power grid, making it difficult to systematically identify the key links to be guaranteed in the power grid, resulting in low efficiency in planning and constructing the strong local power grid, and the ability of the power grid to resist severe natural disasters and extreme external force damage still needs to be improved. Summary of the Invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a method for constructing a strong local power grid, which can systematically and quickly form a strong local power grid and improve the ability of the power grid to resist severe natural disasters and extreme external force damage.

[0007] To solve the above technical problem, the embodiments of the present invention provide a method for constructing a strong local power grid, including:

[0008] Step S1, establishing a list of important power users, where the list of important power users includes users that need to be guaranteed under severe faults among special, first-level, and second-level important power users of the power grid;

[0009] Step S2, for each important user in the list of important power users, establishing the shortest power supply channel from the user access point to the highest voltage level of the urban power grid according to the voltage level;

[0010] Step S3: Combine the same stations and lines in the established shortest power supply channels, and establish a radial power supply grid from the highest voltage level of the power grid to the user access points of each important user.

[0011] Step S4: Establish different path channels from a hub substation located in the core area of the city to the substation of the highest voltage level to form a rapid power restoration connection channel for the hub substation. If there are no less than two path channels, select the path channel with the shortest power supply distance from them and superimpose it on the radial power supply grid; if there are less than two path channels, do not superimpose it on the radial power supply grid.

[0012] Step S5: Establish the shortest power supply channel from the disaster-resistant guarantee power source to the radial power supply grid to connect the disaster-resistant guarantee power source to the radial power supply grid and form a power supply grid to be evaluated.

[0013] Step S6: Form a strong local power grid based on the power supply grid to be evaluated.

[0014] Furthermore, Step S6 further includes: evaluating and adjusting the power supply grid to be evaluated to confirm that it meets the power supply requirements, and using the evaluated and adjusted power supply grid to be evaluated as a strong local power grid.

[0015] Furthermore, Step S6 further includes the step of evaluating and adjusting the power supply grid to be evaluated, specifically including:

[0016] For the case where there are less than two path channels in Step S4, build a second path channel from the hub substation to the substation of the highest voltage level, and superimpose the second path channel on the power supply grid to be evaluated.

[0017] Construct projects related to the second path channel in the power grid in the core area of the city, and establish a project list for solving the problems that do not meet the requirements of regional risk prevention and control and rapid power restoration.

[0018] Furthermore, Step S6 further includes the step of evaluating and adjusting the power supply grid to be evaluated, specifically including:

[0019] Check whether each important user in the list of important power users meets its rapid power restoration requirements.

[0020] For important users who do not meet the rapid power restoration requirements, establish a list of self-provided power sources and emergency mobile power generation vehicles for these important users.

[0021] Furthermore, the step of checking whether each important user in the list of important power users meets its rapid power restoration requirements further includes:

[0022] If the important user is a special or first-class power important user of the power grid, check whether it can be restored to power when any substation at or below 220 kV loses voltage;

[0023] If the important user is a second-class power important user of the power grid, check whether it can be restored to power when any substation at or below 110 kV loses voltage.

[0024] Further, the step of evaluating and adjusting the power grid to be evaluated further includes: for important users who have established a list of self-provided power sources and emergency mobile power generation vehicles but still do not meet the requirements for rapid power restoration, establish a list of projects to address the failure to meet the rapid power restoration requirements of important users.

[0025] Further, the step S6 further includes the step of evaluating and adjusting the power grid to be evaluated, specifically including:

[0026] Check whether the disaster prevention and protection power source meets the set capacity requirements;

[0027] If the disaster prevention and protection power source does not meet the set capacity requirements, perform the following steps:

[0028] Construct and expand the project of the disaster prevention and protection power source, and establish a list of power source projects that do not meet the disaster prevention standards based on this;

[0029] Establish the shortest power supply channel for the newly added power source in the project of expanding the disaster prevention and protection power source to be connected to the power grid to be evaluated, construct the project related to establishing this shortest power supply channel, and establish a list of power grid projects that do not meet the disaster prevention standards based on this;

[0030] Adjust the power grid to be evaluated according to the project of expanding the disaster prevention and protection power source and the project related to establishing this power supply channel.

[0031] Further, the step S6 further includes the step of evaluating and adjusting the power grid to be evaluated, specifically including:

[0032] Check whether the substations and lines in the power grid to be evaluated meet the disaster prevention requirements;

[0033] For substations or lines that do not meet the disaster prevention requirements, construct projects to transform the substations or lines that do not meet the disaster prevention requirements to meet the disaster prevention requirements, and establish a list of power grid projects that do not meet the disaster prevention standards based on this.

[0034] Further, after the step S6, the method further includes:

[0035] Step S7: Output the grid framework diagram of the strong local power grid and the list of equipment or lines, where the list of equipment or lines includes some or all of the following: the power supply path list of the important users, the self-provided power supply list of the important users, the power supply and substation list in the strong local power grid, and the grid framework line list in the strong local power grid.

[0036] Further, the power supply requirements include some or all of the structural risk control and rapid power restoration requirements in the core urban area, the rapid power restoration requirements for each important user, and the disaster prevention requirements for the power supply grid to be evaluated. The disaster prevention requirements for the power supply grid to be evaluated include the capacity requirements for the disaster prevention support power supply and the disaster prevention requirements for the substations and lines in the power supply grid to be evaluated.

[0037] Implementing the embodiments of the present invention has the following beneficial effects: The method for constructing a strong local power grid of the present invention can systematically and rapidly form a strong local power grid, establish key protection for important users, thereby improving the ability of the power grid to resist severe natural disasters and extreme external force damage; The method for constructing a strong local power grid of the present invention focuses on preventing large-scale and long-term power outages of the power grid caused by extreme disasters and faults, so as to reduce losses, quickly restore power, and reduce the social impact caused by extreme situations such as severe natural disasters. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 It is a flowchart of the method for constructing a strong local power grid according to the embodiments of the present invention. Detailed Embodiments

[0040] The following descriptions of the embodiments refer to the drawings to exemplify specific embodiments in which the present invention can be implemented.

[0041] Please refer to Figure 1 , the method for constructing a strong local power grid according to the embodiments of the present invention includes the following steps S1 - S6.

[0042] In step S1, establish a list of important power users, which includes users that need to be guaranteed under severe faults among the grid special-class, first-class, and second-class important power users.

[0043] As an implementation method, the list of important power users includes all extra-special power users of the power grid. For first-level and second-level power users of the power grid, they can choose to be included in the list of important power users according to the impact of power outages. The list of important power users can be established by referring to the national standard "Technical Specification for Power Supply and Self-provided Emergency Power Configuration of Important Power Users" (GB / Z 29328) and combining the sorting, grading, and confirmation of important power users by the power supply company.

[0044] In step S2, for each important user in the list of important power users, a shortest power supply path from the user access point to the highest voltage level of the urban power grid is established according to the voltage level.

[0045] Specifically, for each important user in the list of important power users, a power supply path from the user access point to the highest voltage level of the urban power grid can be established from bottom to top according to the voltage level. When there are multiple power supply paths to choose from, the path with the shortest power supply distance is established, which is the shortest power supply path. For example, if the user access point of an important user is 10 kV and the highest voltage level of the urban power grid is 500 kV, then the shortest power supply path from 10 kV to 500 kV for this important user is established.

[0046] In step S3, the same stations and lines in the established shortest power supply paths are merged to establish a radial power supply grid from the highest voltage level of the power grid to the user access points of each important user.

[0047] Specifically, the same stations and lines in the shortest power supply paths corresponding to all important users established in step S2 are merged to establish a top-down radial power supply grid from the highest voltage level of the power grid to the user access points of each important user.

[0048] In step S4, different path channels from a hub substation located in the core area of the city to the highest voltage level substation are established to form a fast power restoration connection channel for the hub substation. If there are no less than two such path channels, the path channel with the shortest power supply distance is selected and superimposed on the radial power supply grid; if there are less than two path channels, they are not superimposed on the radial power supply grid.

[0049] Specifically, first, the core area of the city needs to be determined. The core area of the city can be the main center and sub-center of the city designated in the urban planning. The hub substation can be a 220 kV substation located in the core area of the city. If there is no 220 kV substation in the core area of the city, a lower-level substation, such as a 110 kV substation, can be selected.

[0050] Next, different path channels are established from the hub substation to the substation with the highest voltage level to form a rapid power restoration connection channel for the hub substation. If at least two different path channels can be established from the hub substation to the substation with the highest voltage level, the path channel with the shortest power supply distance is selected and superimposed on the radial power supply grid. If two different path channels cannot be established from the hub substation to the substation with the highest voltage level, it is not superimposed on the radial power supply grid, and only this risk is recorded for adjustment and improvement in subsequent steps.

[0051] In step S5, the shortest power supply channel from the disaster-resistant guarantee power source to the radial power supply grid is established to connect the disaster-resistant guarantee power source to the radial power supply grid, forming a power supply grid to be evaluated.

[0052] Specifically, the disaster-resistant guarantee power source needs to be determined first. The disaster-resistant guarantee power source refers to a power source that can provide stable and reliable power support for the core area of the city in extreme situations such as severe natural disasters and external force damage. Generally, it is a 110 kV or 220 kV power source with strong regulation ability and has the ability to operate in island or black start mode. There can be multiple such disaster-resistant guarantee power sources, which are evenly distributed in the grid to provide zonal power supply guarantee.

[0053] After determining the disaster-resistant guarantee power source, a power supply channel from the disaster-resistant guarantee power source to the radial power supply grid is established to connect the disaster-resistant guarantee power source to the radial power supply grid through this power supply channel. When multiple power supply channels can be established from the disaster-resistant guarantee power source to the radial power supply grid, the power supply channel with the shortest power supply distance is selected to connect the disaster-resistant guarantee power source to the radial power supply grid, forming a power supply grid to be evaluated.

[0054] The order of the above steps S4 and S5 in the embodiment of the present invention is not limited to this, and they can also be carried out simultaneously or swapped. That is to say, the order of adding the disaster-resistant guarantee power source to the radial power supply grid and adding the hub substation to the radial power supply grid is not limited.

[0055] In step S6, a strong local power grid is formed based on the power supply grid to be evaluated.

[0056] In specific implementation, step S6 may further include evaluating and adjusting the power supply grid to be evaluated to confirm that it meets the power supply requirements, and using the evaluated and adjusted power supply grid to be evaluated as the strong local power grid.

[0057] After forming the power supply grid to be evaluated, the power supply grid to be evaluated can be evaluated and adjusted. If the power supply grid to be evaluated already meets the power supply requirements, the power supply grid to be evaluated is used as a strong local power grid; otherwise, the power supply grid to be evaluated can be adjusted to meet the power supply requirements, and the adjusted power supply grid to be evaluated is used as a strong local power grid. The power supply requirements may include some or all of, but are not limited to, the structural risk control and rapid power restoration requirements in the core area of the city, the rapid power restoration requirements for each important user, and the disaster prevention requirements of the power supply grid to be evaluated. The disaster prevention requirements of the power supply grid to be evaluated may further include the capacity requirements for disaster prevention support power sources and the disaster prevention requirements for substations and lines in the power supply grid to be evaluated.

[0058] Evaluating and adjusting the power supply grid to be evaluated may specifically include the following content. It should be noted that although the following content is described in sequence, the implementation order is not restricted.

[0059] Evaluating and adjusting the power supply grid to be evaluated includes checking the structural risk control and rapid power restoration capabilities in the core area of the city, specifically including:

[0060] For the case where the number of path channels in step S4 is less than two, a second path channel is newly built from the hub substation to the substation of the highest voltage level, and the second path channel is superimposed on the power supply grid to be evaluated;

[0061] Projects related to the second path channel are constructed for the power grid in the core area of the city, and a project list is established to solve the problems of not meeting the regional risk prevention and control and rapid power restoration requirements.

[0062] Furthermore, if the number of path channels in step S4 is less than two, that is, two different path channels cannot be established from the hub substation in the core area to the substation of the highest voltage level, it means that the grid structure of the core area power grid needs to be adjusted so that the structural risk control and rapid power restoration capabilities in the core area meet the requirements. In the embodiment of the present invention, a second path channel is newly built from the hub substation to the substation of the highest voltage level, and the second path channel is superimposed on the power supply grid to be evaluated to adjust the evaluated power supply grid to meet the structural risk control and rapid power restoration requirements in the core area. At the same time, in the embodiment of the present invention, projects related to the second path channel can be constructed for the power grid in the core area of the city, and a project list is established to solve the problems of not meeting the regional risk prevention and control and rapid power restoration requirements.

[0063] Evaluating and adjusting the power supply grid to be evaluated also includes checking whether each important user in the list of important power users meets its rapid power restoration requirements, specifically including:

[0064] Checking whether each important user meets its rapid power restoration requirements;

[0065] For important users who do not meet the requirements of rapid power restoration, establish a list of their self-provided power sources and emergency mobile power generation vehicles.

[0066] Furthermore, for important users who still do not meet the requirements of rapid power restoration after establishing a list of self-provided power sources and emergency mobile power generation vehicles, construct projects that can enable these key users to meet the requirements of rapid power restoration, and thus establish a list of projects to address the situation where important users do not meet the requirements of rapid power restoration.

[0067] Among them, the steps to check whether each important user meets the requirements of rapid power restoration can specifically include: if the important user is a special-grade or first-grade power important user of the power grid, check whether it can restore power when any substation at or below 220 kV voltage level loses voltage; if the important user is a second-grade power important user of the power grid, check whether it can restore power when any substation at or below 110 kV voltage level loses voltage.

[0068] Evaluating and adjusting the power supply grid to be evaluated also includes checking the disaster prevention capabilities of the power supply grid to be evaluated, specifically including:

[0069] Firstly, check whether the disaster prevention guarantee power source meets the set capacity requirements. The capacity requirements can include that the disaster prevention guarantee power source at least guarantees the power supply for the security loads of important users. If the disaster prevention guarantee power source provides zonal power supply guarantee, it should at least guarantee the security loads of important users in the corresponding zone.

[0070] If the disaster prevention guarantee power source cannot meet the set capacity requirements, perform the following steps: construct projects to expand the disaster prevention guarantee power source, and thus establish a list of power source projects that do not meet the disaster prevention standards; establish the shortest power supply channels for the newly added power sources in the projects to expand the disaster prevention guarantee power source to be connected to the power supply grid to be evaluated, construct projects related to establishing these shortest power supply channels, and thus establish a list of power grid projects that do not meet the disaster prevention standards; adjust the power supply grid to be evaluated according to the projects to expand the disaster prevention guarantee power source and the projects related to establishing the power supply channels.

[0071] Secondly, check whether the substations and lines in the power supply grid to be evaluated meet the disaster prevention requirements.

[0072] For substations or lines that do not meet the disaster prevention requirements, construct projects to transform the substations or lines that do not meet the disaster prevention requirements to make them meet the disaster prevention requirements, and thus establish a list of power grid projects that do not meet the disaster prevention standards. For example, for lines in strong wind areas, check whether the wind prevention standards are met. For lines that do not meet the requirements, construct transformation projects for reinforcement.

[0073] According to the above description, when adjusting the power supply grid to be evaluated based on the identified areas that do not meet the power supply requirements, corresponding project lists can be established simultaneously. These lists can jointly generate a list of construction projects for a strong local power grid.

[0074] After step S6 in the method for constructing a strong local power grid according to an embodiment of the present invention, step S7 may be further included. In step S7, a power grid framework diagram of the strong local power grid and a list of equipment or lines are output. The list of equipment or lines may include some or all of the following: a power supply path list for important users, a list of self-provided power sources for important users, a list of power sources and substations in the strong local power grid, and a list of grid framework lines in the strong local power grid.

[0075] As can be seen from the above description, the method for constructing a strong local power grid according to an embodiment of the present invention is based on ensuring the needs of important users such as people's livelihood, establishing a backbone power supply grid framework to ensure the power transmission channels for important users, the fast power restoration connection channels, and the disaster resistance guarantee power channels. The strong local power grid constructed according to an embodiment of the present invention focuses on preventing large-scale and long-term power outages of the power grid caused by extreme disasters and faults, so as to reduce losses, quickly restore power, and reduce the social impact caused by extreme situations such as severe natural disasters.

[0076] Compared with the prior art, the beneficial effects of the present invention are as follows: The method for constructing a strong local power grid of the present invention can systematically and quickly form a strong local power grid, establish key guarantees for important users, and thus improve the ability of the power grid to resist severe natural disasters and extreme external force damage.

[0077] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A method for constructing a strong local power grid, characterized in that, Including: Step S1: Establish a list of important power users, which includes users that need to be guaranteed under severe faults among special-level, first-level, and second-level important power users of the power grid; Step S2: For each important user in the list of important power users, establish the shortest power supply path from the user access point of this important user to the highest voltage level of the urban power grid according to the voltage level; Step S3: Merge the same stations and lines in the established shortest power supply paths, and establish a radial power supply grid framework between the highest voltage level of the power grid and the user access points of each important user; Step S4: Establish different path channels from a hub substation located in the core area of the city to the highest voltage level substation to form a fast power restoration connection channel for this hub substation. If there are no less than two path channels, select the path channel with the shortest power supply distance from them and superimpose it on the radial power supply grid framework; If there are less than two path channels, do not superimpose them on the radial power supply grid framework; Step S6: Establish the shortest power supply path from the disaster-resistant guarantee power source to the radial power supply grid framework to connect the disaster-resistant guarantee power source to the radial power supply grid framework and form a power supply grid framework to be evaluated; Step S7: Based on the power supply grid framework to be evaluated, form a strong local power grid, evaluate and adjust the power supply grid framework to be evaluated to confirm that it meets the power supply requirements, and use the evaluated and adjusted power supply grid framework to be evaluated as the strong local power grid; The evaluation and adjustment of the power supply grid framework to be evaluated to confirm that it meets the power supply requirements includes: for the case where there are less than two path channels in Step S4, newly build a second path channel from the hub substation to the highest voltage level substation, and superimpose the second path channel on the power supply grid framework to be evaluated; construct projects related to the second path channel in the power grid in the core area of the city, and establish a project list for solving the problems that do not meet the requirements of regional risk prevention and control and fast power restoration based on this.

2. The method for constructing a strong local power grid according to claim 1, characterized in that, The step S6 further includes the step of evaluating and adjusting the power supply grid to be evaluated, specifically including: Checking whether each important user in the list of important power users meets its fast power restoration requirements; For important users that do not meet the fast power restoration requirements, establish a list of self-provided power sources and emergency mobile power generation vehicles for this important user.

3. The method for constructing a strong local power grid according to claim 2, characterized in that, The step of checking whether each important user in the list of important power users meets its fast power restoration requirements further includes: If the important user is a special-level or first-level important power user of the power grid, check whether it can be restored when any substation at a voltage level of 220 kV and below loses voltage; If the important user is a second-level important power user of the power grid, check whether it can be restored when any substation at a voltage level of 110 kV and below loses voltage.

4. The method for constructing a strong local power grid according to claim 2, characterized in that, The step of evaluating and adjusting the power supply grid to be evaluated further includes: For important users that still do not meet the fast power restoration requirements after establishing the list of self-provided power sources and emergency mobile power generation vehicles, establish a project list for solving the problems that do not meet the fast power restoration requirements of important users.

5. The method for constructing a strong local power grid according to claim 1, characterized in that, The step S6 further includes the step of evaluating and adjusting the power supply grid to be evaluated, specifically including: Checking whether the disaster-resistant guarantee power source meets the set capacity requirements; If the disaster-resistant guarantee power source cannot meet the set capacity requirements, perform the following steps: Construct and expand the project of the disaster-resistant guarantee power supply, and establish a list of power supply projects that do not meet the disaster prevention standards based on this; Establish the shortest power supply channel for connecting the newly added power supply in the project of expanding the disaster-resistant guarantee power supply to the power supply grid to be evaluated, construct projects related to the establishment of this shortest power supply channel, and establish a list of power grid projects that do not meet the disaster prevention standards based on this; Adjust the power supply grid to be evaluated according to the project of expanding the disaster-resistant guarantee power supply and the projects related to the establishment of this power supply channel.

6. The method for constructing a strong local power grid according to claim 1, characterized in that, The step S6 further includes the step of evaluating and adjusting the power supply grid to be evaluated, specifically including: Check whether the substations and lines in the power supply grid to be evaluated meet the disaster prevention requirements; For substations or lines that do not meet the disaster prevention requirements, construct projects to transform the substations or lines that do not meet the disaster prevention requirements to make them meet the disaster prevention requirements, and establish a list of power grid projects that do not meet the disaster prevention standards based on this.

7. The method for constructing a strong local power grid according to claim 1, characterized in that, After the step S6, the method further includes: Step S7, output the power grid framework diagram of the strong local power grid and the list of equipment or lines, and the list of equipment or lines includes: some or all of the power supply path list of the important users, the self-provided power supply list of the important users, the power supply and substation list in the strong local power grid, and the grid framework line list in the strong local power grid.

8. The method for constructing a strong local power grid according to claim 1, characterized in that, The power supply requirements include some or all of the structural risk control and rapid power restoration requirements in the core urban area, the rapid power restoration requirements of each important user, and the disaster prevention requirements of the power supply grid to be evaluated. The disaster prevention requirements of the power supply grid to be evaluated include the capacity requirements of the disaster-resistant guarantee power supply and the disaster prevention requirements of the substations and lines in the power supply grid to be evaluated.

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