High-permeability power distribution network power supply unit division method and system for distributed power supply

Abstract

The high-permeability power distribution network power supply unit division method for the distributed power supply comprises the following steps: constructing candidate channels, and obtaining a main candidate channel connection structure diagram of a selected area; calculating the maximum network supply load of each plot in the selected area and the maximum network power of the distributed power supply; determining main and standby power supply substations of each plot according to the main candidate channel connection structure diagram of the selected area; dividing the selected area into a plurality of power supply units according to the main power supply transformer substation and the standby power supply transformer substation of each plot, and dividing power supply network elements in the power supply units; adjusting division of a power supply unit and a power supply network element according to the maximum network supply load of each plot and the maximum on-grid power of the distributed power supply of each plot; and optimizing division of the adjusted power supply units and power supply network elements, and drawing a power supply unit contact relation graph. According to the design, optimal configuration and efficient utilization of electric energy are realized through scientific power supply unit division, meanwhile, network loss is reduced, and system stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network planning, and particularly to a method and system for dividing power supply units of a distribution network with high penetration of distributed power sources. Background Art

[0002] Driven by the energy structure transformation and sustainable development strategy, the application of distributed generation (DG) has become an important way to improve energy utilization efficiency and reduce environmental pollution. As the penetration rate of distributed power sources in the distribution network continues to increase, their unique operating characteristics, including intermittency (affected by natural factors such as wind speed and sunlight intensity changes), volatility (unstable output power), and extensive geographical dispersion, have brought unprecedented challenges to the planning and operation of traditional distribution networks. Traditional methods for dividing power supply units of distribution networks are mainly based on the design concept of centralized and stable power supply, and fail to fully anticipate and adapt to these special properties of distributed power sources. This mismatch has led to a series of problems: First, the intermittency and volatility of distributed power sources exacerbate power quality problems in the power grid, such as voltage fluctuations and harmonic pollution; Second, due to the dispersed locations of distributed power sources, traditional power supply unit division is difficult to effectively optimize the power transmission path, thereby increasing network losses; Finally, the access of high-penetration distributed power sources may also reduce the overall stability of the system, increasing the probability and scope of faults.

[0003] Therefore, in order to overcome the above technical problems and ensure the safe, economic, and efficient operation of the distribution network in an environment with high-penetration distributed power sources, there is an urgent need for a method and system for dividing power supply units of a distribution network that can effectively cope with the environment of high-penetration distributed power sources. Summary of the Invention

[0004] The object of the present invention is to overcome the problem existing in the prior art that, in the context of the wide application of distributed power sources, the existing power supply unit division is difficult to effectively optimize the power transmission path, thereby increasing network losses. A method and system for dividing power supply units of a distribution network with high penetration of distributed power sources are provided, which fully consider the characteristics of distributed power sources, and through a scientific and reasonable power supply unit division strategy, realize the optimal configuration and efficient utilization of electric energy, while ensuring the power quality of the power grid, reducing network losses, and improving system stability.

[0005] In a first aspect, an embodiment of the present invention provides a method for dividing power supply units of a distribution network with high penetration of distributed power sources, the division method comprising:

[0006] S1. Construct candidate channels to obtain the backbone candidate channel connection structure diagram of the selected area;

[0007] S2. Calculate the maximum grid supply load and the maximum grid connection power of distributed power sources for each plot within the selected area;

[0008] S3. Determine the main supply substation and the backup supply substation for each plot within the selected area according to the backbone candidate channel connection structure diagram of the selected area;

[0009] S4. Divide the selected area into multiple power supply units based on the main supply substation and the backup supply substation of each plot, and divide power supply network elements within the power supply units;

[0010] S5. Adjust the division of power supply units and power supply network elements according to the maximum grid supply load of each plot and the maximum grid connection power of distributed power sources in each plot;

[0011] S6. Optimize the division of the adjusted power supply units and power supply network elements, and draw a connection relationship diagram of power supply units based on the optimized power supply units and power supply network elements.

[0012] In the step S2, the maximum grid supply load of the i-th plot within the selected area is calculated according to the following formula:

[0013] P iL = P L - λ L P G ;

[0014] In the formula, P iL is the maximum grid supply load of the i-th plot; P L is the maximum electricity consumption load of the i-th plot; λ L is the credibility of the distributed power source for the load power balance scenario in the i-th plot; P G is the maximum output of the distributed power source in the i-th plot;

[0015] The maximum grid connection power of the distributed power source of the i-th plot within the selected area is calculated according to the following formula:

[0016] P iG = λ G P G - γP L ;

[0017] In the formula, P iG is the maximum grid connection power of the distributed power source of the i-th plot; P G is the maximum output of the distributed power source of the i-th plot; λ G is the credibility of the distributed power source for the power balance scenario in the i-th plot; γ is the proportion of the electricity consumption load corresponding to the maximum output time of the distributed power source in the i-th plot to the maximum electricity consumption load; P L is the maximum electricity consumption load of the i-th plot.

[0018] The maximum power consumption load P of the i-th plot within the selected area L It is calculated according to the following formula:

[0019] P L = S × A × B × C;

[0020] In the formula: S is the land area of the i-th plot; A is the plot ratio of the i-th plot; B is the saturated load density of the i-th plot; C is the demand factor of the i-th plot;

[0021] The maximum output P of distributed power sources of the i-th plot within the selected area G It is calculated according to the following formula:

[0022] P G = η × ρ × α × β × χ;

[0023] In the formula, η is the maximum output coefficient of distributed power sources in the i-th plot; ρ is the roof area of the i-th plot; α is the available coefficient of the roof of the i-th plot; β is the installation degree of the roof of the i-th plot; χ is the installation density of distributed power sources in the i-th plot.

[0024] In step S4, according to the main power supply substation and backup power supply substation of each plot, the selected area is divided into multiple power supply units, and the division of power supply network elements in the power supply unit includes the following steps:

[0025] S41. Divide adjacent power supply network element blocks with the same main power supply substation and the same backup power supply substation, or with opposite main power supply substations and backup power supply substations into the same power supply unit;

[0026] S42. Divide adjacent plots with the same main power supply substation in the same power supply unit into the same power supply network element.

[0027] In step S5, according to the maximum network power supply load of each plot and the maximum grid-connected power of distributed power sources of each plot, the adjustment of the division of power supply units and power supply network elements includes the following steps:

[0028] S51. Judge whether the maximum network power supply load and the maximum grid-connected power of distributed power sources of each power supply network element exceed the power supply capacity of 4 groups of medium-voltage typical wiring;

[0029] S52. Split and adjust the power supply network elements whose maximum network power supply load and / or maximum grid-connected power of distributed power sources exceed the power supply capacity of 4 groups of medium-voltage typical wiring to obtain the updated power supply units and power supply network elements;

[0030] S53. Based on the updated power supply network elements, calculate the maximum network supply load of each power supply network element and the maximum grid connection power of distributed power sources, and determine whether the maximum network supply load of a power supply network element and the maximum grid connection power of distributed power sources exceed the power supply capacity of 4 groups of medium-voltage typical wiring. If so, return to step S52; if not, the adjustment ends.

[0031] In the said step S52, the splitting and adjustment include the following steps:

[0032] S521. Determine whether there are adjacent plots with opposite positive and negative maximum grid connection powers on the boundary of the power supply network element. If so, split the adjacent plots with opposite positive and negative maximum grid connection powers into new power supply network elements; if not, proceed to step S522:

[0033] S522. Determine whether there are plots with a power flow opposite to that of the adjacent power supply network element on the boundary of the power supply network element. If so, adjust the plots with a power flow opposite to that of the adjacent power supply network element to the adjacent power supply network element; if not, proceed to step S523;

[0034] S523. Determine whether there are adjacent plots in the power supply network element with a distributed power source penetration rate difference not exceeding 20%. If so, split the adjacent plots with a distributed power source penetration rate difference not exceeding 20% into a new power supply network element; if not, proceed to step S524;

[0035] S524. Adjust the boundary of the power supply network element in a parallel manner.

[0036] In the said step S6, optimize the division of the adjusted power supply units and power supply network elements, and draw a power supply unit connection relationship diagram based on the optimized power supply network elements and power supply units, including the following steps:

[0037] S61. Optimize the adjusted power supply units and power supply network elements in combination with the substation layout locations, capacity sizes, and railways and rivers in the selected area;

[0038] S62. Draw the main connection channels between each power supply station according to the main power supply station and backup power supply station of each optimized power supply unit, and mark the medium-voltage line scale of each power supply unit on each main connection channel.

[0039] The medium-voltage line scale of the jth power supply unit in the selected area is calculated according to the following formula:

[0040]

[0041] In the formula, N j is the medium-voltage line scale of the jth power supply unit, is the sum of the maximum network supply loads of all plots in the jth power supply unit; It is the sum of the maximum grid-connected powers of distributed power sources in all plots within the jth power supply unit, where n is the number of plots within the power supply unit; P is the power supply capacity of a single medium-voltage line in the jth power supply unit.

[0042] In a second aspect, an embodiment of the present invention provides a distribution network power supply unit division system with a high penetration rate of distributed power sources. The system includes:

[0043] A candidate channel construction module for constructing candidate channels to obtain the backbone candidate channel connection structure diagram of the selected area;

[0044] A calculation module for calculating the maximum grid supply load and the maximum grid-connected power of distributed power sources in each plot within the selected area;

[0045] A substation allocation module for determining the main supply substation and the backup supply substation for each plot within the selected area according to the backbone candidate channel connection structure diagram of the selected area;

[0046] A region division module for dividing the selected area into multiple power supply units according to the main supply substation and the backup supply substation of each plot, and dividing power supply network elements within the power supply units;

[0047] An adjustment module for adjusting the division of power supply network elements and power supply units according to the maximum grid supply load of each plot and the maximum grid-connected power of distributed power sources in each plot;

[0048] A drawing module for optimizing the division of the adjusted power supply units and power supply network elements, and drawing the connection relationship diagram of power supply units according to the optimized power supply network elements and power supply units.

[0049] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned distribution network power supply unit division method with a high penetration rate of distributed power sources are implemented.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] 1. The method for dividing the power supply units of the distribution network with high penetration rate of distributed power sources of the present invention is suitable for the distribution network with high penetration rate of distributed power sources. On the basis of considering traditional factors, this method incorporates the consideration of energy flow, the nearby consumption of distributed power sources and the balance of load in different zones. Based on the principle of nearby consumption and nearby backup, the refined division of power supply units is realized. Through key technologies such as local balance of source and load and nearby matching of source and load, this method can achieve the best match between the distributed power sources and loads in each power supply unit, make the penetration rate of distributed power sources between power supply units as close as possible, more effectively manage and control the energy flow in the power grid, ensure the stability and efficiency of the system, and strive to maximize the use of renewable energy while meeting the operation requirements of the power system. Therefore, this design considers the energy flow, the nearby consumption of distributed power sources and the balance of load in different zones, and divides the power supply units and power supply network elements of the distribution network, so that the distributed power sources and loads in each power supply unit can achieve the best match, effectively manage and control the energy flow in the power grid, and maximize the use of renewable energy.

[0052] 2. In the method for dividing the power supply units of the distribution network with high penetration rate of distributed power sources of the present invention, after the power supply units and power supply network elements are initially divided, the power supply network elements with the maximum network supply load and / or the maximum online power of the distributed power sources exceeding the power supply capacity of 4 groups of medium-voltage typical wiring are split and adjusted according to the maximum network supply load of each block and the maximum online power of the distributed power sources of each block, so as to ensure the stability of the system. Therefore, this design adjusts the power supply units and power supply network elements based on the maximum network supply load of each block and the maximum online power of the distributed power sources of each block, so as to ensure the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a flow chart of a method for dividing power supply units of a distribution network with high penetration rate of distributed power sources provided in an embodiment of the present invention.

[0054] Figure 2 This is a trunk candidate channel connection structure diagram provided by an embodiment of the present invention.

[0055] Figure 3 It is a schematic diagram of on-site source-load balancing provided by an embodiment of the present invention.

[0056] Figure 4 It is a schematic diagram of the main and backup power supply stations of a plot provided in an embodiment of the present invention.

[0057] Figure 5 It is a schematic diagram of network element unit division provided by an embodiment of the present invention.

[0058] Figure 6 It is a schematic diagram of source-load proximity matching provided by an embodiment of the present invention.

[0059] Figure 7 It is a schematic diagram of the connection relationship of the power supply unit provided by an embodiment of the present invention.

[0060] Figure 8 It is a schematic diagram of a power supply unit division system for a distribution network with high penetration of distributed power sources provided by an embodiment of the present invention. Specific implementation manners

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0062] Since the traditional method for dividing power supply units in a distribution network is mainly based on the design concept of centralized and stable power supply, it fails to fully consider and adapt to the distribution network with high penetration of distributed power sources. This mismatch in power supply unit division will lead to voltage fluctuations, harmonic pollution, etc. in the power grid. At the same time, the traditional power supply unit division is difficult to effectively optimize the power transmission path of the distribution network with high penetration of distributed power sources, resulting in an increase in network losses, and may reduce the overall stability of the system, increasing the probability and scope of faults. To solve the technical problems existing in the prior art, an embodiment of the present invention provides a method for dividing power supply units in a distribution network with high penetration of distributed power sources.

[0063] See Figure 1 , Figure 1 It is a schematic flow diagram of a method for dividing power supply units in a distribution network with high penetration of distributed power sources provided by an embodiment of the present invention. The method for dividing power supply units in a distribution network with high penetration of distributed power sources includes steps S1 to S6;

[0064] Step S1, construct candidate channels to obtain the backbone candidate channel connection structure diagram of the selected area;

[0065] The backbone candidate channel connection structure diagram includes the backbone connection channels between different substations in the selected area.

[0066] Specifically, referring to information such as substation layout, existing power channels, and municipal traffic road networks, with the goal of minimizing the cost of power grid construction and transformation, and with the main line of the power feeder approaching the load center, while trying to form inter-station connections to improve the power transfer capacity of the power grid, and forming self-loops in areas without conditions as the principle, determine the backbone candidate channel connection structure diagram. As Figure 2 shown, Figure 2It is a backbone candidate channel connection structure diagram provided by an embodiment of the present invention. There are three substations A, B, and C in the selected area. The backbone candidate channel connection structure diagram of the selected area is constructed. Among them, for the A-type power supply sub-zone, an inter-medium-voltage-station connection channel is constructed; for the B and C power supply areas, an inter-medium-voltage-station connection channel is preferentially constructed, and a medium-voltage self-loop connection channel is formed when there is no layout condition. Through the backbone candidate channel connection diagram, it can be determined whether the connection situation of the power supply unit is inter-station connection or self-loop, and this candidate channel can also be referred to during subsequent medium-voltage line routing.

[0067] S2. Calculate the maximum grid supply load of each plot in the selected area and the maximum grid connection power of the distributed power sources in each plot;

[0068] In this embodiment, the maximum grid supply load is the maximum load value of the plot, which can reflect the maximum power demand of the plot during a specific time period (such as one day, one month, one year, etc.); the maximum grid connection power of the distributed power source refers to the maximum power output that the distributed power sources in each plot can provide to the power grid, which reflects the maximum power supply capacity including the distributed power sources in the plot.

[0069] Specifically, for any plot in the selected area, for example, the i-th plot in the selected area, its maximum grid supply load is calculated according to the following formula:

[0070] P iL =P L -λ L P G ;

[0071] In the formula, P iL is the maximum grid supply load of the i-th plot in the selected area; P L is the maximum power consumption load of the i-th plot; λ L is the credibility of the distributed power source for the load power balance scenario in the i-th plot, and the value of λ L generally ranges from 0.03 to 0.3 (0 can be taken in key areas); P G is the maximum output of the distributed power source in the i-th plot.

[0072] The maximum grid connection power of the distributed power source of the i-th plot in the selected area is calculated according to the following formula:

[0073] P iG =λ G P G -γP L ;

[0074] In the formula, P iG is the maximum grid connection power of the distributed power source of the i-th plot in the selected area; P G is the maximum output of the distributed power source of the i-th plot; λG is the credibility of the distributed generation for the power balance scenario in the i-th plot, λ G The value of is generally between 0.73 and 0.97 (1 can be taken in key areas); γ is the proportion of the power load corresponding to the maximum output moment of the distributed generation in the i-th plot to the maximum power load; P L is the maximum power load of the ith plot. According to the above method, the maximum grid load and the maximum grid power of distributed power sources for each plot in the selected area can be calculated.

[0075] Similarly, according to the above method, the maximum grid load and the maximum online power of distributed power sources of all plots in the selected area can be calculated; and the maximum grid load of each power supply network element is the sum of the maximum grid load of all plots within the network element; the maximum online power of distributed power sources of each power supply network element is the sum of the maximum online power of distributed power sources of all plots within the network element.

[0076] In the process of calculating the maximum grid load of each plot and the maximum grid-connected power of distributed power sources, for any plot in the selected area, for example, the i-th plot in the selected area, its maximum power load P L The calculation is performed according to the following formula:

[0077] P L =S×A×B×C;

[0078] Where: S is the land area of ​​the ith plot; A is the plot ratio of the ith plot; B is the saturated load density of the ith plot; C is the demand coefficient of the ith plot;

[0079] The maximum output P of the distributed power source of the i-th plot in the selected area G The calculation is performed according to the following formula:

[0080] P G =η×ρ×α×β×χ;

[0081] Wherein, η is the maximum output coefficient of distributed generation in the ith plot; ρ is the roof area of ​​the ith plot; α is the roof availability coefficient of the ith plot; β is the roof installation density of the ith plot; χ is the distributed generation installation density of the ith plot.

[0082] In this embodiment, when calculating the maximum grid load and the maximum grid power of distributed power sources, the distributed power source credibility λ corresponding to the maximum load moment is L Take 0.2, the distributed power credibility λ corresponding to the maximum output moment of distributed power G Take 0.8, and the load ratio γ takes 0.6. Figure 3 is a schematic diagram of source-load on-site balancing provided by an embodiment of the present invention, such asFigure 3 As shown, the maximum network supply load and the maximum grid-connected power of distributed power sources of each plot within the selected area are calculated.

[0083] Step S3: According to the backbone candidate channel connection structure diagram of the selected area, determine the main supply substation and the backup supply substation of each plot within the selected area.

[0084] Since the backbone candidate channel connection structure diagram includes the backbone connection channels between different substations within the selected area, therefore, according to the backbone candidate channel connection structure diagram, the connection situation between each area within the selected area can be determined as inter-station connection or self-loop, and then it can be determined whether each plot is supplied power by inter-station or self-loop. For the plots supplied power by inter-station, their main and backup supply substations are different substations; for the plots supplied power by self-loop, their main and backup supply substations are the same substation. In this embodiment, according to the backbone candidate channel connection structure diagram, for the plots supplied power by inter-station, according to the power supply range and power supply radius requirements of each power supply station, determine the main supply substation of each plot, and then according to the principle of minimizing the comprehensive cost of the connection channel, determine the backup supply station of each plot.

[0085] Step S4: According to the main supply substation and the backup supply substation of each plot, divide the selected area into multiple power supply units, and divide power supply network elements within the power supply units.

[0086] Specifically, dividing the selected area into multiple power supply units according to the main supply substation and the backup supply substation of each plot, and dividing power supply network elements within the power supply units includes steps S41 to S42:

[0087] S41: Divide adjacent power supply network element blocks with the same main power supply station and the same backup power supply station, or with opposite main and backup power supply stations into the same power supply unit.

[0088] In this embodiment, if the main power supply stations of two adjacent plots are the same and the backup power supply stations are also the same, then these two adjacent plots belong to the same power supply unit. At the same time, if among two adjacent plots, the main power supply station of one plot is the backup power supply station of the other plot, and the backup power supply station of this plot is also the main power supply station of the other plot, then these two adjacent plots also belong to the same power supply unit.

[0089] S42: Divide the plots with the same main power supply station within the same power supply unit into the same power supply network element.

[0090] In this embodiment, after dividing the power supply units and dividing the power supply network elements within the power supply units, the main power supply stations of the plots within the same power supply network element are the same, and the backup power supply stations are also the same. Figure 4 It is a schematic diagram of the main / backup power supply of each plot provided by the embodiment of the present invention, as Figure 4As shown in the figure, in the selected area, the main power supply stations for plots AB1 to AB6 and AC1 to AC2 are Station A, the main power supply stations for plots BA1 to BA3 and BC1 to BC2 are Station B, and the main power supply stations for plots CA1, CB1 to CB2, and C1 to C4 are Station C. At the same time, the backup power supply stations for plots AB1 to AB6 are Station B, the backup power supply stations for plots AC1 to AC2 are Station C, and the backup power supply stations for plots C1 to C4 are Station C.

[0091] S5. Adjust the division of power supply units and power supply network elements according to the maximum grid supply load of each plot and the maximum grid-connected power of distributed power sources in each plot.

[0092] In this embodiment, considering the influencing factors of energy flow direction, nearby consumption of distributed power sources, and load balance of each zone, based on the principle of nearby consumption of source and load and as similar as possible DG penetration rate of each network element unit, the plots or blocks with geographically adjacent power sources and loads, coordinated in time, and matched in capacity are optimized and matched, and the boundaries of the power supply network elements are adjusted.

[0093] Specifically, adjusting the division of power supply network elements and power supply units according to the maximum grid supply load of each plot and the maximum grid-connected power of distributed power sources in each plot includes steps S51 to S53:

[0094] S51. Judge whether the maximum grid supply load and the maximum grid-connected power of distributed power sources of each power supply network element exceed the power supply capacity of 4 groups of medium-voltage typical wiring.

[0095] Among them, the 4 groups of medium-voltage typical wiring means that, based on the requirements of the "Technical Guide for Distribution Network Planning and Design QGDW 10738-2020", the division of power supply units should comprehensively consider the influencing factors such as the layout location, capacity size, and interval resources of the superior substation during the saturation period. During the saturation period, it is appropriate to have 1-4 groups of medium-voltage typical wiring in the power supply unit. Under normal conditions, each power supply line in the power supply unit should preferably supply power only to the loads within this unit. In this embodiment, specifically, when considering the power supply capacity of 4 groups of medium-voltage typical wiring, for example, when the typical wiring adopts a single-loop cable network, considering the power supply capacity of a single cable line in N-1 is calculated as 5MW, and the power supply capacity of 4 groups of medium-voltage typical wiring (8 lines) is 40MW; when the typical wiring adopts a double-loop cable network, considering the power supply capacity of a single medium-voltage line in N-1 is calculated as 5MW, and the power supply capacity of 4 groups of medium-voltage typical wiring (16 lines) is 80MW.

[0096] S52. Split and adjust the power supply network elements whose maximum grid supply load and / or maximum grid-connected power of distributed power sources exceed the power supply capacity of 4 groups of medium-voltage typical wiring to obtain the updated power supply units and power supply network elements.

[0097] Among them, the splitting and adjustment include the following steps:

[0098] S521: Determine whether there are adjacent plots with opposite maximum online power on the boundary of the power supply network element. If yes, split the adjacent plots with opposite maximum online power into new power supply network elements. If no, proceed to step S522:

[0099] S522, judging whether there is a land parcel on the boundary of the power supply network element with a flow opposite to that of an adjacent power supply network element, if so, adjusting the land parcel with a flow opposite to that of an adjacent power supply network element to the adjacent power supply network element, if not, proceeding to step S523;

[0100] S523, determining whether there are adjacent plots with a distributed power source penetration rate difference of no more than 20% in the power supply network element, if so, splitting the adjacent plots with a distributed power source penetration rate difference of no more than 20% into a new power supply network element, if not, proceeding to step S524;

[0101] S524: Adjust the boundary of the power supply network element in a parallel manner.

[0102] In this embodiment, the parallel in adjusting the boundary of the power supply network element in a parallel manner means that the arrangement of the power supply network elements is parallel to the trunk communication channel, that is, the plots on the boundary of the power supply network element are customized adjusted in sequence along the trunk communication channel.

[0103] At the same time, if part of the land parcels on the boundary of the power supply network element are adjusted into other adjacent power supply network elements, the backup power supply station of the adjusted land parcels is changed to the backup power supply station of the adjacent network element.

[0104] Specifically, Figure 5 , Figure 6 As shown in the figure, before the power supply network elements and power supply units are adjusted, network elements AB and BA form an inter-station communication unit, network elements AC and CA form an inter-station communication unit, network elements BC and CB form an inter-station communication unit, and network element C forms an intra-station self-loop unit. Based on the principle of local source-load matching, after the power supply network elements and power supply units are adjusted, network elements AB1 and BA1 match the source and load to form an inter-station communication unit; network elements AB2 and BA2 match the source and load to form an inter-station communication unit; network elements AC and CA match the source and load to form an inter-station communication unit; load BC and load CB match the source and load to form an inter-station communication unit; network elements C1 and C2 match the source and load to form an intra-station self-loop unit.

[0105] S53. Based on the updated power supply network elements, calculate the maximum grid load and the maximum online power of distributed power sources of each power supply network element, and determine whether there are power supply network elements with a maximum grid load and a maximum online power of distributed power sources that exceed the power supply capacity of four groups of medium-voltage typical connections. If so, return to step S52; otherwise, the adjustment ends.

[0106] During the adjustment process, the boundaries of the power supply network elements and power supply units have changed. At the same time, the standby power supply stations in some plots have changed. Therefore, after the adjustment, the adjacent power supply network elements with opposite main and standby power supply substations are adjusted into one power supply unit again.

[0107] Step S6: Optimize the division of power supply units and power supply network elements, and draw a connection relationship diagram of power supply units based on the optimized power supply network elements and power supply units.

[0108] In this embodiment, optimizing the division of power supply network elements and power supply units and drawing a connection relationship diagram of power supply units based on the optimized power supply network elements and power supply units includes steps S61 to S62:

[0109] S61: Optimize the adjusted power supply units and power supply network elements in combination with the layout locations and capacities of substations, as well as the railways and rivers within the selected area.

[0110] Specifically, in combination with the layout locations and capacities of substations, if the intervals between some plots in a power supply network element / power supply unit and the main and standby power supply substations of this power supply network element / power supply unit do not meet the requirements, then these plots need to be adjusted to adjacent network elements. At the same time, generally, a single power supply network element / power supply unit should not cross rivers or railways. If a certain power supply network element / power supply unit crosses a river or railway, it should be split according to the railway and river, with the railway and river as the boundaries.

[0111] S62: Draw the main connection channels between each power supply station according to the main power supply stations and standby power supply stations of each optimized power supply unit, and mark the medium-voltage line scales of each power supply unit on each main connection channel.

[0112] Specifically, when drawing the connection relationship diagram of power supply units, it is necessary to ensure that at least one main connection channel passes through each power supply unit, otherwise there is no medium-voltage line power supply within this power supply unit. The drawn connection lines can intuitively reflect key information such as the outgoing line scale of substations, the interconnection relationship of substations, the boundaries of each power supply unit, and the medium-voltage line scale within the power supply unit.

[0113] In this embodiment, the connection lines within the selected area are as Figure 7 shown. The medium-voltage power supply line scales within each power supply unit are as follows: There are 6 medium-voltage lines in the inter-station connection unit AB; 12 medium-voltage lines in the inter-station connection unit BA; 8 medium-voltage lines in the inter-station connection unit AC; 4 medium-voltage lines in the inter-station connection unit BC; and 4 medium-voltage lines in the in-station self-loop unit C.

[0114] Among them, for any power supply unit within the selected area, such as the j-th power supply unit within the selected area, the scale of its medium-voltage line (number of outgoing lines) is calculated according to the following formula:

[0115]

[0116] In the formula, N j is the scale of the medium-voltage line of the j-th power supply unit, is the sum of the maximum grid-supplied loads of all plots within the j-th power supply unit; is the sum of the maximum grid-connected powers of distributed power sources of all plots within the j-th power supply unit, n is the number of plots within the j-th power supply unit; P is the power supply capacity of a single medium-voltage line within the j-th power supply unit. Among them, a single medium-voltage line refers to any one of the outgoing lines of the corresponding power supply unit, and the power supply capacity of each single medium-voltage line is equal.

[0117] In summary, the embodiment of the present invention provides a method for dividing power supply units of a distribution network suitable for high penetration of distributed power sources. Based on traditional unit division elements such as load distribution, power corridors, and administrative divisions, this method comprehensively considers factors such as energy flow direction, nearby consumption of distributed power sources, and load balance of partitions, optimizes and improves the existing power supply unit division method, aiming to improve power quality, reduce network losses, and enhance the overall stability and reliability of the system. It is mainly applicable to a new type of distribution network with large-scale distributed power source access.

[0118] According to the method described in the above embodiment, this embodiment will further describe from the perspective of a power supply unit division system of a distribution network with high penetration of distributed power sources. The power supply unit division system of the distribution network with high penetration of distributed power sources can be implemented as an independent entity or integrated in an electronic device, such as a terminal.

[0119] Please refer to Figure 8 , the power supply unit division system of the distribution network with high penetration of distributed power sources provided by the embodiment of the present invention includes:

[0120] A candidate channel construction module, configured to construct candidate channels to form a backbone candidate channel connection structure diagram; the candidate channel construction module is used to execute the step S1.

[0121] A calculation module, configured to calculate the maximum grid-supplied load and the maximum grid-connected power of distributed power sources of each plot within the selected area; the calculation module is used to execute the step S2.

[0122] In step S2, the maximum grid-supplied load of the i-th plot within the selected area is calculated according to the following formula:

[0123] P iL =PL -λ L P G ;

[0124] Wherein, P iL is the maximum network supply load of the i-th plot; P L is the maximum electricity consumption load of the i-th plot; λ L is the credibility of the distributed power source for the load power balance scenario in the i-th plot; P G is the maximum output of the distributed power source in the i-th plot;

[0125] The maximum grid-connected power of the distributed power source of the i-th plot in the selected area is calculated according to the following formula:

[0126] P iG = λ G P G - γP L ;

[0127] Wherein, P iL is the maximum grid-connected power of the distributed power source of the i-th plot in the selected area; P G is the maximum output of the distributed power source of the i-th plot; λ G is the credibility of the distributed power source for the power balance scenario in the i-th plot; γ is the ratio of the electricity consumption load corresponding to the maximum output time of the distributed power source in the i-th plot to the maximum electricity consumption load; P L is the maximum electricity consumption load of the i-th plot;

[0128] The maximum electricity consumption load P L of the i-th plot in the selected area is calculated according to the following formula:

[0129] P L = S × A × B × C;

[0130] Wherein: S is the land area of the i-th plot; A is the plot ratio of the i-th plot; B is the saturated load density of the i-th plot; C is the demand factor of the i-th plot;

[0131] The maximum output P G of the distributed power source of the i-th plot in the selected area is calculated according to the following formula:

[0132] P G = η × ρ × α × β × χ;

[0133] Wherein, η is the maximum output coefficient of the distributed power source in the i-th plot; ρ is the roof area of the i-th plot; α is the available coefficient of the roof of the i-th plot; β is the installation degree of the roof of the i-th plot; χ is the installation density of the i-th plot.

[0134] A substation allocation module, configured to determine the main supply substation and the backup supply substation for each plot within the selected area according to the backbone candidate channel connection structure diagram of the selected area; the substation allocation module is used to execute step S3.

[0135] A region division module, configured to divide the selected area into multiple power supply units according to the main supply substation and the backup supply substation of each plot, and divide power supply network elements within the power supply units; the region division module is used to execute step S4.

[0136] In step S4, dividing the selected area into multiple power supply units according to the main supply substation and the backup supply substation of each plot, and dividing power supply network elements within the power supply units includes the following steps:

[0137] S41. Divide adjacent power supply network element blocks with the same main power supply substation and the same backup power supply substation, or with opposite main and backup power supply substations, into the same power supply unit;

[0138] S42. Divide adjacent plots with the same main power supply substation within the same power supply unit into the same power supply network element.

[0139] An adjustment module, configured to adjust the division of power supply network elements and power supply units according to the maximum network supply load of each plot and the maximum grid-connected power of distributed power sources of each plot; the adjustment module is used to execute step S5.

[0140] In step S5, adjusting the division of power supply network elements and power supply units according to the maximum network supply load of each plot and the maximum grid-connected power of distributed power sources of each plot includes the following steps:

[0141] S51. Determine whether the maximum network supply load and the maximum grid-connected power of distributed power sources of each power supply network element exceed the power supply capacity of 4 groups of medium-voltage typical wiring;

[0142] S52. Split and adjust the power supply network elements whose maximum network supply load and / or maximum grid-connected power of distributed power sources exceed the power supply capacity of 4 groups of medium-voltage typical wiring to obtain updated power supply units and power supply network elements;

[0143] S53. Based on the updated power supply network elements, calculate the maximum network supply load and the maximum grid-connected power of distributed power sources of each power supply network element, and determine whether there is a power supply network element whose maximum network supply load and the maximum grid-connected power of distributed power sources exceed the power supply capacity of 4 groups of medium-voltage typical wiring. If so, return to step S52; if not, the adjustment ends.

[0144] The splitting and adjustment include the following steps:

[0145] S521. Determine whether there are adjacent plots on the boundary of the power supply network element with opposite maximum power injection values. If so, split the adjacent plots with opposite maximum power injection values into new power supply network elements. If not, proceed to step S522:

[0146] S522. Determine whether there are plots on the boundary of the power supply network element with a power flow opposite to that of the adjacent power supply network element. If so, adjust the plots with a power flow opposite to that of the adjacent power supply network element to the adjacent power supply network element. If not, proceed to step S523;

[0147] S523. Determine whether there are adjacent plots in the power supply network element with a distributed power penetration rate difference of no more than 20%. If so, split the adjacent plots with a distributed power penetration rate difference of no more than 20% into a new power supply network element. If not, proceed to step S524;

[0148] S524. Adjust the boundary of the power supply network element in parallel.

[0149] A drawing module for optimizing the division of the adjusted power supply unit and power supply network element, and drawing a connection relationship diagram of the power supply unit according to the optimized power supply network element and power supply unit; the drawing module is used to execute the step S6.

[0150] In step S6, optimizing the division of the adjusted power supply unit and power supply network element, and drawing a connection relationship diagram of the power supply unit according to the optimized power supply network element and power supply unit includes the following steps:

[0151] S61. Optimize the adjusted power supply unit and power supply network element in combination with the substation layout location, capacity, and railways and rivers in the selected area;

[0152] S62. Draw the main connection channels between the power supply stations according to the main power supply station and backup power supply station of each optimized power supply unit, and mark the medium-voltage line scale of each power supply unit on each main connection channel;

[0153] The medium-voltage line scale of the jth power supply unit in the selected area is calculated according to the following formula:

[0154]

[0155] In the formula, N j is the medium-voltage line scale of the jth power supply unit, is the sum of the maximum network supply loads of all plots in the jth power supply unit; is the sum of the maximum power injection values of distributed power sources of all plots in the jth power supply unit, n is the number of plots in the power supply unit; P is the power supply capacity of a single medium-voltage line in the jth power supply unit.

[0156] In specific implementation, each of the above modules can be implemented as an independent entity, or can be arbitrarily combined and implemented as the same or several entities.

[0157] The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned method for dividing a power supply unit of a distribution network with high penetration of distributed power sources is implemented.

[0158] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. A non-transitory computer-readable storage medium can include any computer-readable medium except the signal itself propagating temporarily.

[0159] A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with a system, apparatus, or device that can be instructed to execute.

[0160] Computer program code for performing the operations of the present invention can be written using one or more programming languages or combinations thereof. These programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as C language or similar programming languages. In particular, the Python language suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. can be used. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through various types of networks, including a local area network (LAN) or a wide area network (WAN), or through an Internet connection provided by an Internet service provider.

[0161] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for dividing power supply units of a distribution network with high penetration rate of distributed power sources, characterized in that: The division method comprises: S1. Construct candidate channels and obtain a trunk candidate channel connection structure diagram of the selected area; S2. Calculate the maximum grid load and the maximum grid-connected power of distributed power sources for each block in the selected area; S3, according to the trunk candidate channel connection structure diagram of the selected area, determine the main supply substation and backup supply substation of each block in the selected area; S4. Divide the selected area into multiple power supply units according to the main power supply substation and backup power supply substation of each block, and divide the power supply network elements in the power supply unit; S5. Adjust the division of power supply units and power supply network elements according to the maximum grid supply load of each block and the maximum grid-connected power of distributed power sources of each block; S6. Optimize the division of the adjusted power supply units and power supply network elements, and draw a power supply unit communication relationship diagram based on the optimized power supply units and power supply network elements.

2. The method for dividing power supply units of a distribution network with high penetration rate of distributed power sources according to claim 1 is characterized in that: In step S2, the maximum grid supply load of the i-th plot in the selected area is calculated according to the following formula: P iL =P L -λ L P G ; Where P iL is the maximum grid load of the ith plot; P L is the maximum power load of the ith plot; L is the credibility of the distributed generation used for load power balancing scenario in the i-th plot; P G is the maximum output of distributed generation in the i-th plot; The maximum grid-connected power of the distributed power source of the i-th plot in the selected area is calculated according to the following formula: P iG =λ G P G -γP L ; Where P iG is the maximum grid-connected power of the distributed power source of the i-th plot; P G is the maximum output of the distributed power source in the ith plot; λ G is the credibility of the distributed power source used for the power balance scenario in the i-th plot; γ is the proportion of the power load corresponding to the maximum output moment of the distributed power source in the i-th plot to the maximum power load; P L is the maximum power load of the ith plot.

3. The method for dividing power supply units of a distribution network with high penetration rate of distributed power sources according to claim 2 is characterized in that: The maximum power load P of the i-th plot in the selected area L The calculation is performed according to the following formula: P L =S×A×B×C; Where: S is the land area of ​​the ith plot; A is the plot ratio of the ith plot; B is the saturated load density of the ith plot; C is the demand coefficient of the ith plot; The maximum output P of the distributed power source of the i-th plot in the selected area G The calculation is performed according to the following formula: P G =η×ρ×α×β×χ; Wherein, η is the maximum output coefficient of distributed generation in the ith plot; ρ is the roof area of ​​the ith plot; α is the roof availability coefficient of the ith plot; β is the roof installation degree of the ith plot; χ is the distributed generation installation density of the ith plot.

4. The method for dividing power supply units of a distribution network with high penetration of distributed power sources according to claim 1, characterized in that: In step S4, the selected area is divided into a plurality of power supply units according to the main power supply substation and the backup power supply substation of each block, and the power supply network elements are divided in the power supply unit, including the following steps: S41, dividing adjacent power supply network element blocks with the same main power supply station and the same backup power supply station, or with opposite main power supply stations and backup power supply stations into the same power supply unit; S42. In the same power supply unit, adjacent plots with the same main power supply station are divided into the same power supply network element.

5. The method for dividing power supply units of a distribution network with high penetration rate of distributed power sources according to claim 1, characterized in that: In step S5, adjusting the division of power supply units and power supply network elements according to the maximum grid supply load of each block and the maximum grid-connected power of distributed power sources of each block includes the following steps: S51, judging whether the maximum network load of each power supply network element and the maximum online power of the distributed power supply exceed the power supply capacity of four groups of medium voltage typical wiring; S52, splitting and adjusting the power supply network elements whose maximum grid-supplied load and / or maximum grid-connected power of distributed power sources exceeds the power supply capacity of four groups of medium-voltage typical wiring to obtain updated power supply units and power supply network elements; S53. Based on the updated power supply network elements, calculate the maximum grid load and the maximum online power of distributed power sources of each power supply network element, and determine whether there are power supply network elements with a maximum grid load and a maximum online power of distributed power sources that exceed the power supply capacity of four groups of medium-voltage typical connections. If so, return to step S52; otherwise, the adjustment ends.

6. The method for dividing power supply units of a distribution network with high penetration of distributed power sources according to claim 5, characterized in that: In step S52, the splitting and adjusting includes the following steps: S521: Determine whether there are adjacent plots with opposite maximum online power on the boundary of the power supply network element. If yes, split the adjacent plots with opposite maximum online power into new power supply network elements. If no, proceed to step S522: S522, judging whether there is a land parcel on the boundary of the power supply network element with a flow opposite to that of an adjacent power supply network element, if so, adjusting the land parcel with a flow opposite to that of an adjacent power supply network element to the adjacent power supply network element, if not, proceeding to step S523; S523, determining whether there are adjacent plots with a distributed power source penetration rate difference of no more than 20% in the power supply network element, if so, splitting the adjacent plots with a distributed power source penetration rate difference of no more than 20% into a new power supply network element, if not, proceeding to step S524; S524: Adjust the boundary of the power supply network element in a parallel manner.

7. The method for dividing power supply units of a distribution network with high penetration of distributed power sources according to claim 5 or 6, characterized in that: In the step S6, the division of the adjusted power supply unit and the power supply network element is optimized, and drawing a power supply unit contact relationship diagram according to the optimized power supply unit and the power supply network element includes the following steps: S61. Optimize the adjusted power supply units and power supply network elements based on the locations and capacities of the substations, as well as the railways and rivers in the selected area; S62. Draw trunk communication channels between the power supply stations based on the optimized main power supply stations and backup power supply stations of each power supply unit, and mark the scale of the medium-voltage line of each power supply unit on each trunk communication channel.

8. The method for dividing power supply units of a distribution network with high penetration of distributed power sources according to claim 7, characterized in that: The medium voltage line size of the jth power supply unit in the selected area is calculated according to the following formula: Where N j is the medium voltage line size of the jth power supply unit, is the sum of the maximum grid loads of all plots in the jth power supply unit; It is the sum of the maximum grid-connected power of distributed power sources of all plots in the jth power supply unit, n is the number of plots in the jth power supply unit; P is the power supply capacity of a single medium-voltage line in the jth power supply unit.

9. A power supply unit division system for a distribution network with high penetration of distributed power sources, characterized in that: The system comprises: A candidate channel construction module is used to construct candidate channels and obtain a trunk candidate channel connection structure diagram of the selected area; A calculation module is used to calculate the maximum grid load of each block in the selected area and the maximum grid-connected power of the distributed power source; A substation allocation module, used to determine the main supply substation and backup supply substation of each block in the selected area according to the trunk candidate channel contact structure diagram of the selected area; The regional division module is used to divide the selected area into multiple power supply units according to the main power supply substation and backup power supply substation of each block, and divide the power supply network elements in the power supply unit; An adjustment module is used to adjust the division of power supply units and power supply network elements according to the maximum grid supply load of each block and the maximum grid-connected power of distributed power sources in each block; The drawing module is used to optimize the division of the adjusted power supply units and power supply network elements, and draw a power supply unit connection relationship diagram based on the optimized power supply units and power supply network elements.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the method according to any one of claims 1 to 8 are implemented.

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