Power grid planning method for distributed power generation system

Abstract

The invention discloses a power grid planning method for a distributed power generation system, and relates to power grid planning, a distribution block is preset, the distribution block comprises power utilization nodes and power generation nodes constructed based on the power utilization nodes, and flexible power supply points are preset based on the distribution block; constructing a power utilization community based on the plurality of distribution blocks; a plurality of power grid lines are preset based on a power utilization community and a flexible power supply point, and matching rules are set based on power generation nodes; and screening an actual power grid line from the plurality of power grid lines based on a matching rule. The power generation nodes and the flexible power supply points in the power utilization community are used for presetting a plurality of power grid lines, the actual power grid line is selected according to the requirements of supply and demand balance, multiple power generation types and adaptation of the power generation threshold value and the power utilization threshold value, and the flexible power supply points can be divided into the power grid lines in order to meet planning of the power grid lines; the flexible power supply point can also be independent of the power grid line, and meets the power supply and / or voltage stabilization requirements of the power grid line.

Description

Technical Field

[0001] The invention relates to power grid planning, and in particular to a power grid planning method for a distributed power generation system. Background Art

[0002] Distributed power generation system refers to a power generation system that converts multiple energy sources into electricity and distributes it to energy consumers through the power network. Compared with the traditional centralized power generation system, the distributed power generation system has many advantages such as more flexibility, efficiency, reliability, energy saving, and environmental protection.

[0003] At present, the research results of domestic distributed power generation are concentrated on wind power generation and photovoltaic power generation. However, natural resources such as wind energy and solar energy are easily affected by the environment, climate and other aspects. This makes wind power and photovoltaic power generation intermittent and volatile, which seriously affects the safe and stable operation of the power grid. In order to reduce the impact of single power generation, it is necessary to increase the types of power generation and combine different types of power generation into a suitable power grid line. In order to ensure the stability of the power and voltage of the power grid line, it is often necessary to set up a backup power supply point, but the power supply point only corresponds to one power grid line and is only used in emergencies, making the power supply point inflexible and inefficient. Summary of the invention

[0004] The purpose of the present invention is to provide a power grid planning method for a distributed power generation system to solve the shortcomings of the background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a power grid planning method for a distributed power generation system, comprising the following steps: presetting a distribution block, the distribution block comprising: a power consumption node and a power generation node constructed based on the power consumption node, the power consumption node comprising: a power consumption area location, a power consumption period and a power consumption based on the power consumption period, the power generation node comprising: a power generation area location, a power generation type, a power generation period, direct power generation, energy storage power, and presetting a flexible power supply point based on the distribution block.

[0006] Build an electricity consumption community based on several distribution blocks.

[0007] Multiple power grid lines are preset based on electricity consumption communities and flexible power supply points, and matching rules are set based on power generation nodes. The matching rules include: supply selection, type matching, and threshold matching.

[0008] The actual power grid lines are selected from multiple power grid lines based on supply selection, type matching, and threshold matching.

[0009] In a preferred embodiment, distribution blocks are preset, and the step of presetting flexible power supply points based on the distribution blocks includes: constructing a regional plan map, dividing the regional plan map into a number of distribution blocks, marking the locations of power consumption areas and power generation areas on the regional plan map, counting the power consumption of the power consumption nodes in each power consumption period in chronological order and obtaining the cumulative power consumption a by summing them up, estimating the direct power generation and energy storage power in the power generation period, determining the energy storage power generation based on the energy storage power and power generation consumption, counting the energy storage power generation and direct power generation of the power generation nodes in chronological order and obtaining the cumulative power generation b1 by summing them up.

[0010] In a preferred embodiment, the step of constructing an electricity consumption community based on several distribution blocks includes: taking the distribution block corresponding to the electricity consumption within a unit time that exceeds the preset electricity consumption as the core distribution block, extending outward by a preset distance with the core distribution block as the center to obtain the electricity consumption community, the electricity consumption community includes multiple complete distribution blocks, and overlapping areas are set between adjacent electricity consumption communities. The overlapping areas are separated and used as flexible power supply points. The flexible power supply points are configured with controllers, and the connection or disconnection between the flexible power supply points and adjacent electricity consumption communities is controlled based on the controller. The output voltage of the flexible power supply points is adjusted based on the transformer, and each electricity consumption community corresponds to multiple flexible power supply points.

[0011] In a preferred embodiment, multiple power grid lines are preset based on power consumption communities and flexible power supply points, and the step of setting matching rules based on power generation nodes includes: connecting multiple power generation nodes and multiple flexible power supply points corresponding to the power consumption communities to power consumption nodes in the power consumption communities to obtain multiple power grid lines, estimating the power generation loss of each power grid line, obtaining the cumulative power consumption A of the power grid line based on the sum of the cumulative power consumption a of each power consumption node, obtaining the cumulative power generation b2 of the power grid line based on the sum of the cumulative power generation b1 of each power generation node, obtaining the actual cumulative power generation B based on the difference between the cumulative power generation b2 and the power generation loss, estimating the power consumption threshold C of the power grid line in a power consumption period based on the power consumption nodes, and estimating the power generation threshold D in a power generation period based on the energy storage power of the power generation nodes.

[0012] Supply selection is to compare the supply and demand relationship between the cumulative electricity consumption A and the actual cumulative power generation B.

[0013] Type matching is to compare the number of power generation types in the grid lines.

[0014] Threshold matching is to compare the adaptation relationship between the power consumption threshold C and the power generation threshold D.

[0015] In a preferred embodiment, a plane coordinate system is set up based on the power grid line, the horizontal axis of the plane coordinate system is marked with time, the vertical axis of the plane coordinate system is marked with electricity, and a cumulative electricity consumption curve is constructed on the plane coordinate system in chronological order, and a cumulative power generation curve is constructed on the plane coordinate system in chronological order.

[0016] In a preferred embodiment, the step of selecting power grid lines based on supply includes: when the cumulative power consumption curve crosses the cumulative power generation curve, the power grid line is judged to be unqualified, and the power grid lines that meet the requirements are marked as pending lines. The same batch of pending lines have the same number of distribution blocks corresponding to them, and only the same batch of pending lines are compared, and the pending lines with a large number of blocks are given priority.

[0017] In a preferred embodiment, the step of determining the power grid lines based on type matching and threshold matching includes: determining the number of power generation types corresponding to each pending line in the same batch of pending lines, and selecting the pending lines with more power generation types than other lines as candidate lines.

[0018] Based on the candidate lines, the power consumption threshold C and power generation threshold D of each candidate line are determined. The candidate lines whose power consumption threshold C is not greater than the power generation threshold D are qualified lines. The DC difference E is obtained based on the qualified lines, and the qualified lines with the smallest E value are screened out as the actual lines of the power grid.

[0019] In a preferred embodiment, all power generation nodes and multiple flexible power supply points within the electricity consumption community are selected to form a power grid line. When the power grid line is unqualified, one power generation node is reduced until the power grid line is qualified and the corresponding power grid line is used as the actual power grid line. When the power generation of the actual power grid line is insufficient to support the power consumption, at least one flexible power supply point is controlled to be connected to the actual power grid line based on the controller, and the power supply or voltage stabilization of the actual power grid line is completed through the flexible power supply point.

[0020] In a preferred embodiment, all power generation nodes and multiple flexible power supply points within the electricity consumption community are selected to form a power grid line. When the power grid line is unqualified, one power generation node is reduced until the power grid line is qualified and the corresponding power grid line is used as the actual power grid line. When the power generation of the actual power grid line is insufficient to support the power consumption, at least one flexible power supply point is controlled to be connected to the actual power grid line based on the controller, and the power supply or voltage stabilization of the actual power grid line is completed through the flexible power supply point.

[0021] In the above technical scheme, the technical effects and advantages provided by the present invention are as follows: by constructing an electricity consumption community, and using the power generation nodes and flexible power supply points in the electricity consumption community to preset multiple power grid lines, and selecting the actual power grid lines based on the requirements of supply and demand balance, multiple power generation types, and adaptation of power generation thresholds to power consumption thresholds, the flexible power supply points can be included in the power grid lines in order to meet the planning of the power grid lines, and the flexible power supply points can also be independent of the power grid lines to meet the power supply and / or voltage stabilization needs of the power grid lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1, please refer to Figure 1 As shown, the power grid planning method for a distributed power generation system described in this embodiment includes the following steps:

[0026] S1. Preset distribution blocks. The distribution blocks include: power consumption nodes and power generation nodes based on the power consumption nodes. The power consumption nodes include: power consumption area location, power consumption period and power consumption based on the power consumption period. The power generation nodes include: power generation area location, power generation type, power generation period, direct power generation, energy storage power. Flexible power supply points are preset based on the distribution blocks.

[0027] The types of electricity generation include: solar power generation, natural gas power generation, biomass power generation, wind power generation, hydropower generation, hydrogen power generation, geothermal power generation, ocean power generation, and comprehensive resource utilization power generation. Increasing the types of electricity generation facilitates the matching of power generation nodes.

[0028] S2. Build an electricity consumption community based on several distribution blocks.

[0029] S3. Preset multiple power grid lines based on electricity consumption communities and flexible power supply points, and set matching rules based on power generation nodes. The matching rules include: supply selection, type matching, and threshold matching.

[0030] S4. Filter out actual power grid lines from multiple power grid lines based on supply selection, type matching, and threshold matching.

[0031] As described in the above steps S1-S4, the distributed power generation system mainly forms a power network through wind power generation and photovoltaic power generation and supplies electricity to energy consumers in a decentralized manner, but natural resources such as wind power and solar energy are easily affected by the environment, climate and other aspects. This makes wind power and photovoltaic power generation intermittent and volatile, which seriously affects the safe and stable operation of the power grid. In order to reduce the impact of single power generation, it is necessary to increase the types of power generation and combine different types of power generation into a suitable power grid line. In order to ensure the stability of the power and voltage of the power grid line, it is often necessary to set up a spare power supply point, but the power supply point only corresponds to one power grid line and is only used in an emergency, making the power supply point inflexible and inefficient. However, this application constructs a power consumption community, and uses the power generation nodes and flexible power supply points in the power consumption community to preset multiple power grid lines, and selects the actual power grid line according to the requirements of supply and demand balance, multiple types of power generation, and adaptation of power generation thresholds and power consumption thresholds. Flexible power supply points can be included in the power grid line to meet the planning of the power grid line, and flexible power supply points can also be independent of the power grid line to meet the power supply and / or voltage stabilization requirements of the power grid line.

[0032] In one embodiment, the preset distribution block, based on the distribution block preset flexible power supply point S1, includes:

[0033] S11. Construct a regional plan map, divide the regional plan map into several distribution blocks, and mark the locations of power consumption areas and power generation areas on the regional plan map.

[0034] The edge lines of the power consumption area are marked in green on the regional plan, and the edge lines of the power generation area are marked in red on the regional plan to facilitate distinction and measurement.

[0035] S12. Count the power consumption of the power consumption node in each power consumption period in chronological order and obtain the cumulative power consumption a by summing them up. Estimate the direct power generation and energy storage power in the power generation period. Determine the energy storage power generation based on the energy storage power and power generation consumption. Count the energy storage power generation and direct power generation of the power generation node in chronological order and obtain the cumulative power generation b1 by summing them up.

[0036] The electricity consumption nodes include: the location of the electricity consumption area, the electricity consumption period, and the power consumption based on the electricity consumption period. The power generation nodes include: the location of the power generation area, the type of power generation, the power generation period, the direct power generation, and the energy storage capacity.

[0037] When the stored electric energy is converted into output electric energy (storage power generation), there is power consumption. Therefore, storage power generation = storage power - power generation consumption.

[0038] In order to ensure that a single distribution block can supply power independently, it is necessary to measure the relationship between the cumulative power consumption a and the cumulative power generation b1 of the distribution block to ensure that the cumulative power consumption is not greater than the cumulative power generation b1.

[0039] As described in the above steps S11-S12, by pre-setting distribution blocks, the specific locations of each small electricity consumption group and power generation node are clarified. The power generation node is established according to the location of the electricity consumption node, so as to quickly determine the concentrated area of ​​electricity consumption, laying the foundation for the subsequent division of large areas; using the distribution block as the basic unit, the power consumption, power generation and power transmission of the distribution block are measured, so that the measurement standard is digitized for easy statistics and comparison.

[0040] In one embodiment, the step of constructing the electricity consumption community S2 based on a plurality of distribution blocks includes:

[0041] S21. The distribution block corresponding to the power consumption within a unit time exceeding the preset power consumption is taken as the core distribution block, and a preset distance is extended outward with the core distribution block as the center to obtain a power consumption community, which includes multiple complete distribution blocks.

[0042] The distribution blocks with the highest electricity consumption are determined on the regional plan. Areas with high electricity consumption are mostly densely populated areas and industrial and commercial core areas, with high demand for electricity and high requirements for the quality of power transmission. Therefore, it is necessary to give priority to meeting the demand. The distribution blocks with electricity consumption higher than the preset electricity consumption per unit time are taken as core distribution blocks. The preset distance is set according to the distance between the core distribution blocks to obtain multiple electricity consumption communities.

[0043] S22. Overlapping areas are set up between adjacent electricity-consuming communities. The overlapping areas are separated and used as flexible power supply points. The flexible power supply points are set up in adjacent electricity-consuming communities. The flexible power supply points are equipped with controllers. The connection or disconnection between the flexible power supply points and the adjacent electricity-consuming communities is controlled based on the controller. The output voltage of the flexible power supply points is adjusted based on the transformer. Each electricity-consuming community corresponds to multiple flexible power supply points.

[0044] An electricity-consuming community forms an overlapping area with an adjacent electricity-consuming community. For example, if parts of two electricity-consuming communities overlap to form an overlapping area, the flexible supply points in the overlapping area correspond to the two electricity-consuming communities. If parts of three electricity-consuming communities overlap to form an overlapping area, the flexible supply points in the overlapping area correspond to the three electricity-consuming communities.

[0045] If multiple electricity-consuming communities are connected in sequence, a flexible supply point will be set up in the overlapping area of ​​two adjacent electricity-consuming communities, and a flexible supply point will be set up at both ends of the first end of each electricity-consuming community. There are two flexible supply points for each electricity-consuming community, and the total number of flexible supply electricity is the same as the total number of electricity-consuming communities. The electricity-consuming communities are matched with multiple flexible supply points as a guarantee, and the total number of flexible supply points is relatively small, which reduces costs.

[0046] In cases of imbalance in power supply and power consumption or accidents, power-consuming communities may experience power shortages or even power outages or unstable voltage, requiring intervention and assistance from flexible supply points.

[0047] The flexible power supply point is the separation point of adjacent power-consuming communities. The flexible power supply point is connected to the lines of the adjacent power-consuming communities. According to demand, several flexible power supply points corresponding to the power-consuming communities can be selected and connected to the circuits within the power-consuming communities. The flexible power supply point can become a part of the power-consuming community or be independent of the power-consuming community. It is only connected to the power-consuming community when supplying power or stabilizing the voltage for the power-consuming community. At other times, the flexible power supply point can be disconnected from the power-consuming community. It is flexible to use and can be flexibly matched according to line requirements.

[0048] As described in the above steps S21-S22, a core distribution block is set, and a power consumption community is obtained based on the core distribution block. Individual distribution blocks are connected together, and the power generation nodes in the combined distribution blocks are interconnected to increase the types of power generation, make up for the insufficiency of power generation, reduce the influence of the power generation nodes on the environment, climate, etc., and dilute the intermittent and fluctuating characteristics of a single type of power generation, so that the circuit of the power consumption community is more stable. The connection or disconnection between the flexible power supply point and the adjacent power consumption community is controlled based on the controller, and the output voltage of the flexible power supply point is adjusted based on the transformer. Each power consumption community corresponds to two flexible power supply points, and the selection method of the flexible power supply point is increased to match different power consumption communities, complete the power supply and voltage stabilization of the power consumption community, and improve the stability of power consumption in the power consumption community.

[0049] In one embodiment, a plurality of power grid lines are preset based on power consumption communities and flexible power supply points, and a matching rule S3 is set based on power generation nodes, including:

[0050] S31. Connect several power generation nodes and multiple flexible power supply points corresponding to power consumption communities with power consumption nodes in the power consumption communities to obtain several power grid lines, estimate the power generation loss of each power grid line, obtain the cumulative power consumption A of the power grid line based on the sum of the cumulative power consumption a of each power consumption node, obtain the cumulative power generation b2 of the power grid line based on the sum of the cumulative power generation b1 of each power generation node, obtain the actual cumulative power generation B based on the difference between the cumulative power generation b2 and the power generation loss, estimate the power consumption threshold C of the power grid line in a power consumption period based on the power consumption nodes, and estimate the power generation threshold D in a power generation period based on the energy storage capacity of the power generation nodes.

[0051] For example, when a power consumption community consists of 5 distribution blocks, the power consumption community has 5 power generation nodes. 5 power generation nodes can be selected to form a power grid line. If the power consumption of the power consumption node corresponding to the power grid line is greater than the power generation of the power generation node in unit time, several flexible power supply points are added to the original power grid line to form a new power grid line, and the number of flexible power supply points added is selected according to the missing power generation; or one power generation node can be removed (randomly), and the remaining 4 power generation nodes form a power grid line. If the power consumption of the power consumption node corresponding to the power grid line is greater than the power generation of the power generation node in unit time, several flexible power supply points are added to the original power grid line to form a new power grid line. In this way, the power generation nodes are continuously reduced, and the remaining power generation nodes are combined with flexible power supply points to form a power grid line. There is more than one way to combine, and multiple power grid lines can be formed.

[0052] S32, supply selection is to compare the supply and demand relationship between the cumulative power consumption A and the actual cumulative power generation B; type matching is to compare the number of power generation types in the power grid lines; threshold matching is to compare the adaptation relationship between the power consumption threshold C and the power generation threshold D.

[0053] S33. A plane coordinate system is set based on the power grid line, the horizontal axis of the plane coordinate system is marked with time, the vertical axis of the plane coordinate system is marked with electricity, a cumulative electricity consumption curve is constructed on the plane coordinate system in chronological order, and a cumulative power generation curve is constructed on the plane coordinate system in chronological order.

[0054] As described in the above steps S31-S33, several power grid lines are formed through several power generation nodes and at most one flexible power supply point, providing selectivity, and selecting suitable power grid lines from several power grid lines based on the requirements of supply selection, type matching, and threshold matching. The power grid lines combine and match the power generation nodes in the power consumption community, so that different types of power generation types cooperate with each other, increase the power generation methods in the lines used by the entire power consumption community, and improve the diversity of the power supply methods of the lines and the stability during use.

[0055] In one embodiment, the step of selecting the actual power grid line S4 from a plurality of power grid lines based on supply selection, type matching, and threshold matching includes:

[0056] S41. Filter the grid lines based on supply selection. When the cumulative power consumption curve crosses the cumulative power generation curve, the grid line is judged to be unqualified, and the grid lines that meet the requirements are marked as pending lines. The same batch of pending lines have the same number of distribution blocks. Only the same batch of pending lines are compared, and the pending lines with more blocks are judged first.

[0057] The cumulative power generation curve can be covered with sensing points, and when the cumulative power consumption curve touches the sensing points and crosses the sensing points, the power grid line is judged.

[0058] S42, determine the power grid lines based on type matching and threshold matching. Determine the number of power generation types corresponding to each pending line in the same batch of pending lines, and select the pending lines with more power generation types than other lines as candidate lines; determine the power consumption threshold C and power generation threshold D of each candidate line based on the candidate lines, and the candidate lines with power consumption threshold C not greater than power generation threshold D are qualified lines, and obtain the DC difference E based on the qualified lines, and select the qualified lines with E values ​​less than other lines as the actual power grid lines.

[0059] Supply selection, type matching, and threshold matching are all used to judge the power grid line. When any one of the judgment results of supply selection, type matching, and threshold matching is unqualified, the power grid line can be judged to be unqualified.

[0060] S43. Select all power generation nodes and multiple flexible power supply points within the electricity consumption community to form a power grid line. When the power grid line is unqualified, reduce one power generation node until the power grid line is qualified and use the corresponding power grid line as the actual power grid line. When the power generation of the actual power grid line is insufficient to support the power consumption, control at least one flexible power supply point to be connected to the actual power grid line based on the controller, and complete the power supply or voltage stabilization of the actual power grid line through the flexible power supply point.

[0061] The core distribution blocks can be numbered according to the level of electricity consumption. The higher the electricity consumption, the smaller the core distribution block number, and the smaller the number of the electricity consumption community constructed by the core distribution block. Priority is given to dividing the power grid lines for electricity consumption communities with small numbers.

[0062] For example, if each flexible power supply point corresponds to two electricity-consuming communities, when the power grid needs a flexible power supply point, several flexible power supply points are selected from multiple flexible power supply points to join the power grid, and the several flexible power supply points are always connected to the power grid. When the power grid does not need a flexible power supply point, the flexible power supply point is pending. When another power-consuming community adjacent to the pending flexible power supply point does not need a flexible power supply point to join the power grid, the flexible power supply point remains neutral and detects the power and voltage conditions of the power grid lines of the adjacent power-consuming communities. When a power grid line is short of power or the voltage is unstable, the flexible power supply point is used to supply power or stabilize the voltage of the power grid in a timely manner. When both power grid lines need to be adjusted, the power grid line of the power-consuming community with a smaller number is adjusted first.

[0063] When the flexible power supply point is in a neutral state, the grid line is the main line, and the connection line between the flexible power supply point and the grid line is the auxiliary line. For example, when the main line is overloaded and the auxiliary line is too light, the voltage of the auxiliary line will increase.

[0064] As described in the above steps S41-S43, the grid lines are screened through supply selection, type matching, and threshold matching, and the actual grid lines are screened out from multiple grid lines. The grid lines are flexibly matched with flexible power supply points. When the grid lines need flexible power supply points as stable and continuous power generation units, the flexible power supply points are incorporated into the grid lines and become part of the grid lines. When the grid lines do not need flexible power supply points as stable and continuous power generation units, the flexible power supply points remain in a neutral state, detect the actual grid lines, and can supply power or stabilize the voltage of the actual grid lines.

[0065] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power grid planning method for distributed generation systems, It is characterized in that The following steps are involved: Preset distribution blocks, which include: power consumption nodes and power generation nodes based on power consumption nodes. Power consumption nodes include: power consumption area location, power consumption period and power consumption based on power consumption period. Power generation nodes include: power generation area location, power generation type, power generation period, direct power generation, energy storage power. Preset flexible power supply points based on distribution blocks; Building electricity consumption communities based on several distribution blocks; Preset multiple power grid lines based on power consumption communities and flexible power supply points, and set matching rules based on power generation nodes. The matching rules include: supply selection, type matching, and threshold matching; The actual power grid lines are selected from multiple power grid lines based on supply selection, type matching, and threshold matching.

2. A method for planning a power grid for a distributed power generation system according to claim 1, Features: The steps of presetting the distribution block and presetting the flexible power supply point based on the distribution block include: Construct a regional plane map and divide it into several distribution blocks. The locations of the power consumption areas and the power generation areas are marked on the regional plane map. The power consumption of the power consumption nodes in each power consumption period is counted in chronological order and the cumulative power consumption a is obtained by summing up. The direct power generation and energy storage power in the power generation period are estimated. The energy storage power generation is determined based on the energy storage power and power generation consumption. The energy storage power generation and direct power generation of the power generation nodes are counted in chronological order and the cumulative power generation b1 is obtained by summing up.

3. A method for power grid planning for a distributed power generation system according to claim 1, Features: The steps to build an electricity consumption community based on several distribution blocks include: The distribution block corresponding to the power consumption per unit time that exceeds the preset power consumption is taken as the core distribution block, and the preset distance is extended outward with the core distribution block as the center to obtain a power consumption community. The power consumption community includes multiple complete distribution blocks. Overlapping areas are set between adjacent power consumption communities. The overlapping areas are separated and used as flexible power supply points. The flexible power supply points are equipped with controllers. The connection or disconnection between the flexible power supply points and adjacent power consumption communities is controlled based on the controller. The output voltage of the flexible power supply points is adjusted based on the transformer. Each power consumption community corresponds to multiple flexible power supply points.

4. A method for planning a power grid for a distributed power generation system according to claim 1, Features: The steps of presetting multiple power grid lines based on power consumption communities and flexible power supply points and setting matching rules based on power generation nodes include: Connect several power generation nodes and multiple flexible power supply points corresponding to power consumption communities with power consumption nodes in the power consumption communities to obtain several power grid lines, estimate the power generation loss of each power grid line, obtain the cumulative power consumption A of the power grid line based on the sum of the cumulative power consumption a of each power consumption node, obtain the cumulative power generation of the power grid line based on the sum of the cumulative power generation b1 of each power generation node, obtain the actual cumulative power generation B based on the difference between the cumulative power generation b2 and the power generation loss, estimate the power consumption threshold C of the power grid line in a power consumption period based on the power consumption nodes, and estimate the power generation threshold D of a power generation period based on the energy storage power of the power generation nodes; Supply selection is to compare the supply and demand relationship between the cumulative power consumption A and the actual cumulative power generation B; Type matching is to compare the number of power generation types in the grid lines; Threshold matching is to compare the adaptation relationship between the power consumption threshold C and the power generation threshold D.

5. A method for power grid planning for a distributed power generation system according to claim 4, Features: A plane coordinate system is set up based on the power grid line. The horizontal axis of the plane coordinate system is marked with time, and the vertical axis of the plane coordinate system is marked with electricity. A cumulative electricity consumption curve is constructed on the plane coordinate system in chronological order, and a cumulative power generation curve is constructed on the plane coordinate system in chronological order.

6. A method for power grid planning for a distributed power generation system according to claim 4, Features: The steps for selecting grid lines based on supply options include: When the cumulative power consumption curve crosses the cumulative power generation curve, the power grid line is judged to be unqualified, and the power grid lines that meet the requirements are marked as pending lines. The same batch of pending lines have the same number of distribution blocks. Only the same batch of pending lines are compared, and the pending lines with more blocks are given priority.

7. A method for power grid planning for a distributed power generation system according to claim 6, Features: The steps of determining the power grid line based on type matching and threshold matching include: Determine the number of power generation types corresponding to each pending line in the same batch of pending lines, and select the pending lines with more power generation types than other lines as candidate lines; Based on the candidate lines, the power consumption threshold C and power generation threshold D of each candidate line are determined. The candidate lines whose power consumption threshold C is not greater than the power generation threshold D are qualified lines. The DC difference E is obtained based on the qualified lines, and the qualified lines with the smallest E value are screened out as the actual lines of the power grid.

8. A method for power grid planning for a distributed power generation system according to claim 7, Features: All power generation nodes and multiple flexible power supply points within the electricity consumption community are selected to form a power grid line. When the power grid line is unqualified, one power generation node is reduced until the power grid line is qualified and the corresponding power grid line is used as the actual power grid line. When the power generation of the actual power grid line is insufficient to support the power consumption, at least one flexible power supply point is controlled to be connected to the actual power grid line based on the controller, and the power supply or voltage stabilization of the actual power grid line is completed through the flexible power supply point.

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