Method and Device for Quantifying Line Losses in New Energy Power Grids

Abstract

This invention provides a method and apparatus for quantifying line losses in a renewable energy power grid, belonging to the field of line loss analysis. The method includes: acquiring renewable energy ledger information and renewable energy power data for a target area power grid; determining power transmission path information corresponding to each voltage level in the target area power grid based on the renewable energy ledger information; and determining renewable energy line loss information for the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data. This achieves quantitative calculation of renewable energy line losses, improving the accuracy of line loss calculation.

Description

Technical Field

[0001] This invention relates to the field of line loss analysis technology, and in particular to a method and apparatus for quantifying line losses in new energy power grids. Background Technology

[0002] The large-scale grid connection of new energy sources such as wind power and photovoltaics has changed the power supply pattern of traditional power transmission and distribution networks. Distributed photovoltaics, centralized wind power, and local photovoltaic power consumption near the load end reduce the power supply load of traditional power transmission and distribution networks. This reduces losses in transmission and distribution equipment such as conductors and transformers, becoming a loss-reducing factor in the transmission and distribution process. However, existing loads cannot fully absorb the electricity generated by new energy sources, thus requiring reverse transmission along power lines to higher voltage levels. On the one hand, the reverse transmission increases losses during transmission through conductors; on the other hand, the reverse transmission is absorbed step by step near lower voltage levels, reducing the amount of electricity transmitted downwards from higher voltage levels, thereby reducing transmission and distribution losses at higher voltage levels.

[0003] In existing technologies, line losses are determined by using software to perform theoretical calculations based on a theoretical line loss calculation model of a specific power grid, line, and transformer. Alternatively, by using historical data comparison, a fitting function of a multi-factor set is constructed based on the correlation between changes in the installed capacity of photovoltaic and wind power and historical monthly line losses, and theoretical line losses under photovoltaic and wind power conditions are estimated.

[0004] However, in existing technologies, theoretical calculation software separates the transmission and distribution networks. The back-feedback of power from lower-level grids to higher-level grids suffers from data loss and inaccurate data extraction, leading to discontinuous distributed power flow calculations and difficulty in accurately analyzing their impact on line losses. Furthermore, theoretical calculation models are limited to a few time periods; calculating monthly or annual theoretical line losses requires extensive data over a large period, resulting in an excessively large computational load and difficulties in obtaining statistical results. Using historical data lacks reliable data on line loss impact, making accurate assessment of line losses impossible. Summary of the Invention

[0005] This invention provides a method and apparatus for quantifying line losses in new energy power grids to solve the problem of the inability to accurately assess line losses.

[0006] In a first aspect, embodiments of the present invention provide a method for quantifying line losses in a new energy power grid, comprising:

[0007] Obtain renewable energy ledger information and renewable energy power data for the target area's power grid;

[0008] Based on the new energy ledger information, determine the power transmission path information corresponding to each voltage level in the target area power grid;

[0009] Based on the power transmission path information corresponding to each voltage level and the new energy power data, the new energy line loss information of the target area power grid is determined.

[0010] In one possible implementation, the new energy line loss information includes the regional increase in power loss, the regional decrease in power loss, and the regional net decrease rate of the target area power grid.

[0011] The step of determining the renewable energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data includes:

[0012] Based on the transmission path information corresponding to each voltage level and the new energy power data, the reverse transmission power and total grid-connected power of each voltage level are determined; wherein, the reverse transmission power of each voltage level is the sum of the power transmitted from that voltage level to each higher voltage level through the corresponding transmission path.

[0013] Based on the reverse transmission power and total grid-connected power at each voltage level, the regional power loss increase, regional power loss decrease, and regional net power loss rate of the target area power grid are obtained.

[0014] In one possible implementation, obtaining the regional power loss increase, regional power loss decrease, and regional net power loss rate of the target area power grid based on the reverse transmission power and total grid connection power at each voltage level includes:

[0015] The amount of electricity consumed at each voltage level is determined based on the reverse transmission power and the total grid connection power at each voltage level; wherein, the amount of electricity consumed is the amount of new energy power consumed at the corresponding voltage level.

[0016] Based on the reverse transmission power and absorption power of each voltage level, the increase and decrease power corresponding to each voltage level are obtained; where the increase power is the power loss that increases during the transmission of reverse power in the conductor, and the decrease power is the power loss that is reduced when supplying power to the lower voltage level by the absorption power.

[0017] Based on the increased and decreased electricity losses corresponding to each voltage level, the regional increased electricity losses, regional decreased electricity losses, and regional net loss reduction rate of the target area power grid are determined.

[0018] In one possible implementation, determining the power consumption of each voltage level based on the reverse transmission power and the total grid connection power of each voltage level includes:

[0019] The total grid-connected power and the reverse transmission power for each voltage level are subtracted to determine the power consumption for each voltage level.

[0020] In one possible implementation, obtaining the increased and decreased power losses corresponding to each voltage level based on the reverse transmission and absorption power losses at each voltage level includes:

[0021] The reverse transmission power of each voltage level is multiplied by the voltage level voltage division loss rate corresponding to that voltage level to determine the power loss of each voltage level.

[0022] The power consumption of each voltage level is multiplied by the total voltage drop rate of the voltage levels above the voltage level to determine the power loss reduction of each voltage level.

[0023] In one possible implementation, determining the regional increase in power loss, the regional decrease in power loss, and the regional net decrease rate of the target area power grid based on the increase in power loss and decrease in power loss corresponding to each voltage level includes:

[0024] The power loss increase corresponding to each voltage level in the target area power grid is numerically summed to determine the regional power loss increase of the target area power grid.

[0025] The power loss reduction corresponding to each voltage level in the target area power grid is numerically summed to determine the regional power loss reduction of the target area power grid.

[0026] The net power loss of the target area's power grid is determined by subtracting the power loss of the target area's power grid from the power loss of the target area's power grid. The net power loss rate of the target area is then determined based on the net power loss and the regional power supply of the target area's power grid.

[0027] In one possible implementation, after determining the renewable energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data, the method further includes:

[0028] Based on the renewable energy line loss information, renewable energy ledger information, and renewable energy power data of the target area power grid, a loss reduction feasibility analysis is conducted on the target area power grid, and a corresponding technical loss reduction report is generated for the target area power grid.

[0029] In one possible implementation, determining the reverse transmission power and total grid connection power for each voltage level based on the transmission path information corresponding to each voltage level and the new energy power data includes:

[0030] Based on the transmission path information corresponding to each voltage level, the sum of the electricity transmitted from each voltage level to other higher voltage levels in the new energy power data is determined, as well as the total grid-connected electricity of each voltage level, and the sum of the electricity is used as the reverse transmission electricity corresponding to the voltage level.

[0031] In one possible implementation, the new energy ledger information includes the distribution area, access information, and line information of each load point in the target area power grid.

[0032] Secondly, embodiments of the present invention provide a device for quantifying line losses in a new energy power grid, comprising:

[0033] The acquisition unit is used to acquire new energy ledger information and new energy power data of the target area power grid;

[0034] The first processing unit is used to determine the power transmission path information corresponding to each voltage level in the target area power grid based on the new energy ledger information.

[0035] The second processing unit is used to determine the new energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the new energy power data.

[0036] This invention provides a method and apparatus for quantifying line losses in a renewable energy power grid. By acquiring renewable energy ledger information and renewable energy power data of a target area power grid, and then determining the power transmission path information corresponding to each voltage level in the target area power grid based on the renewable energy ledger information, and further determining the renewable energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data, the quantitative calculation of renewable energy line losses is realized, thereby improving the accuracy of line loss calculation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the implementation of the new energy power grid line loss quantification method provided in this embodiment of the invention;

[0039] Figure 2 This is a flowchart illustrating the implementation of another method for quantifying line losses in a new energy power grid, as provided in this embodiment of the invention.

[0040] Figure 3This is a schematic diagram of the structure of the new energy power grid line loss quantification device provided in an embodiment of the present invention. Detailed Implementation

[0041] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail. Invention Overview

[0043] The inventors have discovered that in existing technologies, theoretical calculation software separates the transmission and distribution networks. The back-feedback of power from lower-level grids to higher-level grids suffers from data loss and inaccurate data extraction, leading to discontinuous distributed power flow calculations and difficulty in accurately analyzing their impact on line losses. Furthermore, theoretical calculation models are limited to a few time periods; calculating monthly or annual theoretical line losses requires extensive data over a large period, resulting in an excessively large computational load and making statistical analysis difficult. Using historical data lacks reliable data on line loss impact, making accurate assessment of line losses impossible.

[0044] In order to improve the accuracy of line loss assessment, the embodiments of this application combine the new energy ledger information and new energy power data of the power grid to determine the power transmission path information corresponding to each voltage level in the power grid, and then, based on the power transmission path information, accurately assess the line loss.

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0046] Figure 1 The implementation flowchart of the new energy power grid line loss quantification method provided in the embodiments of the present invention is described in detail below:

[0047] Step 101: Obtain the renewable energy ledger information and renewable energy power data of the target area power grid.

[0048] For example, after determining the target power grid area for line loss analysis and the time period to be analyzed, this embodiment can obtain the renewable energy ledger information of the target power grid area from the data source system. This ledger information pertains to renewable energy in the target power grid area. Furthermore, it obtains the renewable energy power consumption data to be analyzed, which includes the electricity consumption of renewable energy at various distribution areas and load points within the target power grid area. The renewable energy power consumption data can be, but is not limited to, monthly, quarterly, or annual data from the target power grid area. The target power grid area can be, but is not limited to, provincial, municipal, or county-level regional power grids. The data source system can be, but is not limited to, a synchronous line loss system, a homogeneous data source system, or a mid-platform data system to achieve the data acquisition objective.

[0049] Step 102: Based on the new energy ledger information, determine the power transmission path information corresponding to each voltage level in the target area power grid.

[0050] For example, the new energy ledger information can record information such as the distribution area, access point information, access capacity and line of each load point under the target area power grid. In this embodiment, the new energy ledger information can be used to determine the power transmission path information of each voltage level in the target area power grid, such as 380 volts, 10 kV, 35 kV, 110 kV, 220 kV and 550 kV.

[0051] Step 103: Determine the new energy line loss information of the target area power grid based on the power transmission path information and new energy power data corresponding to each voltage level.

[0052] For example, this embodiment can find the new energy power data corresponding to each voltage level in the new energy power data according to the power transmission path information corresponding to each voltage level, and perform further derivation and calculation based on the corresponding power data to statistically determine the new energy line loss information of the target area power grid.

[0053] In summary, this embodiment of the invention obtains renewable energy ledger information and renewable energy power data of the target area power grid; determines the power transmission path information corresponding to each voltage level in the target area power grid based on the renewable energy ledger information; and determines the renewable energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data; thus realizing the quantitative calculation of renewable energy line loss and improving the accuracy of line loss calculation.

[0054] Figure 2 The implementation flowchart of another method for quantifying line losses in new energy power grids provided in this embodiment of the invention is detailed below:

[0055] Step 201: Obtain the renewable energy ledger information and renewable energy power data of the target area power grid.

[0056] For example, see this step. Figure 1 The relevant descriptions in the embodiments will not be repeated here.

[0057] Step 202: Based on the new energy ledger information, determine the power transmission path information corresponding to each voltage level in the target area power grid.

[0058] In one example, the new energy ledger information includes the distribution area, access information, and line information of each load point in the target area's power grid.

[0059] For example, the information recorded in the new energy ledger, such as the distribution area, distribution area attributes, access point information, access capacity, and lines of each load point under the target area power grid, can determine the distribution area information and load information under each voltage level under the target area power grid, and can determine the power transmission path information between each voltage level.

[0060] In one example, the new energy power grid line loss quantification method provided in this application is applicable to both distributed and centralized new energy power generation. For centralized power sources, the relationship between the line and the corresponding voltage level substation can be established through the substation to which the line belongs. For distributed power sources, for example, the distribution area containing distributed power sources can be located from the distribution area ledger system or a system with distribution area topology data. The corresponding 10 kV line can be found through the line to which the distribution area belongs in the distribution area attributes. The voltage divider of the corresponding 35 kV or higher substation can be found from the substation to which the line belongs in the line attributes. For 10 kV distributed power sources, the line to which the distributed power source belongs can be located from the line ledger system (or a system with line topology data). The voltage divider of the corresponding substation can be found from the substation to which the line belongs in the line attributes.

[0061] Step 203: Based on the transmission path information and new energy power data corresponding to each voltage level, determine the reverse transmission power and total grid-connected power for each voltage level; wherein, the reverse transmission power for each voltage level is the sum of the power transmitted from that voltage level to each higher voltage level through the corresponding transmission path.

[0062] In one example, based on the transmission path information corresponding to each voltage level, the sum of the electricity transmitted from each voltage level to the other higher voltage levels in the new energy power data is determined as the reverse transmission electricity corresponding to the voltage level, and the total grid-connected electricity of each voltage level is determined.

[0063] For example, after determining the transmission path information corresponding to each voltage level, the total grid-connected electricity for each voltage level and the total electricity transmitted from each voltage level to higher voltage levels via the corresponding transmission path can be queried and determined based on the renewable energy power data corresponding to each voltage level. For example, renewable energy power transmitted from 10 kV to 35 kV, 110 kV, and 220 kV.

[0064] In one example, the reverse power transfer at each voltage level can be determined by the following formula:

[0065]

[0066] The total grid-connected power consumption for each voltage level can be determined by the following formula:

[0067]

[0068] Among them, A Fk For the reverse transmission of electrical quantity at voltage level k, A F,k-j A represents the amount of electricity transferred in the reverse direction from voltage level k to the higher voltage level j. Gk For the grid-connected electricity of new energy sources at voltage level k; A F,i-k This refers to the amount of electricity fed back from voltage level i to voltage level k.

[0069] Step 204: Determine the amount of electricity consumed at each voltage level based on the reverse transmission electricity and the total grid connection electricity at each voltage level; wherein, the amount of electricity consumed is the amount of new energy electricity consumed at the corresponding voltage level.

[0070] In one example, step 204 includes:

[0071] The total grid-connected power and the reverse transmission power for each voltage level are subtracted to determine the power consumption for each voltage level.

[0072] For example, based on the reverse transmission power and total grid connection power of each voltage level, and the numerical relationship between the reverse transmission power, total grid connection power and consumption power of each voltage level, the consumption power of each voltage level for new energy can be calculated and determined. For example, the consumption power of each voltage level can be determined by subtracting the total grid connection power and reverse transmission power of each voltage level.

[0073] In one example, the amount of electricity absorbed at each voltage level can be determined by the following formula:

[0074] A Sk =A k,total -A Fk

[0075] Among them, A SkFor the amount of electricity absorbed at voltage level k, A FK For the reverse transmission of electrical quantity at voltage level k; A k,total For the total grid-connected power at voltage level k; A F,i-k The reverse power transmission from voltage level i to voltage level k, where voltage level k is higher than voltage level i.

[0076] Step 205: Based on the reverse transmission power and absorption power of each voltage level, obtain the increase in power loss and decrease in power loss corresponding to each voltage level; wherein, the increase in power loss is the power loss that increases during the transmission of reverse power in the conductor, and the decrease in power loss is the power loss of transmission and distribution when supplying power downward from a higher voltage level that is reduced by the absorption power.

[0077] In one example, step 205 includes:

[0078] The reverse transmission power of each voltage level is multiplied by the voltage level voltage division loss rate corresponding to the voltage level to determine the power loss of each voltage level.

[0079] The power consumption of each voltage level and the total voltage loss rate of the voltage levels above the voltage level are multiplied together to determine the power loss reduction of each voltage level.

[0080] For example, as electricity is transmitted upwards from the power supply end, power loss increases, but this also reduces the power loss reduced by supplying power at higher voltage levels. Therefore, for each voltage level, the increased power loss corresponding to that voltage level can be determined based on the corresponding reverse power transmission; and the decreased power loss corresponding to that voltage level can be determined based on the corresponding absorbed power. For instance, the increased power loss for each voltage level can be calculated by multiplying the reverse power transmission and the voltage level loss rate corresponding to that voltage level; and the decreased power loss for each voltage level can be calculated by multiplying the absorbed power and the total voltage level loss rate above that voltage level.

[0081] In one example, the increased and decreased power consumption for each voltage level can be determined by the following formula:

[0082] ΔA k- =A Sk ×ΔA% kUp

[0083] ΔA k+ =A Fk ×ΔA% k

[0084] Wherein, ΔA% kUp The total voltage drop rate for voltage levels above k is ΔA%. kThe voltage drop rate at voltage level k; ΔA k- For the power loss at voltage level k, ΔA k+ The power loss at voltage level k; A Sk For the amount of electricity absorbed at voltage level k, A Fk This refers to the reverse transmission power at voltage level k.

[0085] In one example, for a single voltage divider, the net power loss can be defined as follows:

[0086] ΔA k,net- =ΔA k- -ΔA k+

[0087] Where, ΔA k,net- This represents the net power loss at voltage level k.

[0088] The formula for calculating the reduction rate at voltage level k is:

[0089] ΔA k- % = ΔA k- / A total ×100

[0090] The formula for calculating the loss increase rate at voltage level k is:

[0091] ΔA k+ % = ΔA k+ / A total ×100

[0092] The formula for calculating the net loss rate at voltage level k is:

[0093] ΔA k,net- % = ΔA k,net- / A total ×100

[0094] For individual voltage division, here A total Power supply for the area.

[0095] Step 206: The new energy line loss information includes the regional increase in power loss, the regional decrease in power loss, and the regional net decrease in power loss of the target area power grid; based on the increase in power loss and decrease in power loss corresponding to each voltage level, determine the regional increase in power loss, the regional decrease in power loss, and the regional net decrease in power loss of the target area power grid.

[0096] In one example, step 206 includes:

[0097] The power loss and increase corresponding to each voltage level in the target area power grid are numerically summed to determine the regional power loss and increase of the target area power grid.

[0098] The power loss reduction corresponding to each voltage level in the target area power grid is numerically summed to determine the regional power loss reduction of the target area power grid.

[0099] The net loss of the target area's power grid is determined by subtracting the net loss of the regional power grid from the net loss of the regional power grid, and the regional net loss rate is determined based on the net loss of the regional power grid and the regional power supply of the target area's power grid.

[0100] For example, after determining the increased and decreased power losses at each voltage level, the increased power losses at each voltage level are summed to determine the regional increased power loss of the target area power grid; the decreased power losses at each voltage level in the target area power grid are summed to determine the regional decreased power loss of the target area power grid; after determining the regional decreased power loss and regional increased power loss, the regional decreased power loss and regional increased power loss are subtracted to obtain the regional net decreased power loss; the regional net decreased power loss is then divided by the regional total power supply to determine the regional net decreased power loss rate.

[0101] In one example, the regional increase in power loss, the regional decrease in power loss, and the regional net decrease rate of the target area's power grid can be determined by the following formula:

[0102]

[0103] Where, ΔA - To reduce regional power loss, ΔA + Increased power loss in the region; ΔA k- To reduce the power loss at the k-th voltage level, ΔA k+ denoted as the power loss / increase at the k-th voltage level; n represents the number of voltage levels in the target area's power grid.

[0104] Step 207: After determining the renewable energy line loss information of the target area power grid based on the power transmission path information and renewable energy power data corresponding to each voltage level, a loss reduction feasibility analysis is conducted on the target area power grid based on the renewable energy line loss information, renewable energy ledger information, and renewable energy power data, and a technical loss reduction report corresponding to the target area power grid is generated.

[0105] For example, after determining the new energy line loss information of the target area power grid, a loss reduction feasibility analysis can be conducted on the target area power grid by combining the historical and current new energy line loss information of the target area power grid, the power grid architecture, load, transformer area information, and power supply information of the target area power grid, and generating a technical loss reduction report corresponding to the target area power grid in order to maximize loss reduction.

[0106] In summary, this embodiment solves the problem of quantifying line loss during the transmission of new energy power from low voltage to higher voltage levels. It is applicable to, but not limited to, the quantitative analysis of monthly or annual line loss impact in regional power grids at the provincial, municipal, and county levels. It has high accuracy and scientific validity in long-term line loss statistical analysis, providing practical technical means for regional power grid line loss statistical analysis and the formulation of technical loss reduction schemes.

[0107] In one example, taking the calculation of distributed photovoltaic power generation as an example, except for the lowest voltage level (380V grid), the power consumption at other voltage levels may include reverse power from the lower-level grid. In the process of calculating the power consumption, the following assumptions are made:

[0108] (1) Assume that the 35 kV and above power grid does not include distributed grid-connected electricity.

[0109] (2) The electricity that is fed back from 10 kV to 35 kV, 110 kV or 220 kV will no longer be fed back to higher voltage levels. It is considered that the electricity fed back is completely absorbed at one voltage level.

[0110] (3) The power consumption of 35 kV, 110 kV and 220 kV is the power that is fed back to the voltage level by the 10 kV line according to the line path.

[0111] Based on the above assumptions and formulas (1)-(6), we can obtain:

[0112] 1.500 kV and above power grid: no distributed grid connection, no power consumption, and no reverse power at other voltage levels.

[0113] A 500,total =A S500 =A F500 =0, ΔA 500- =ΔA 500+ =0.

[0114] Among them, A 500,total For 500 kV grid-connected power, A S500 For 500 kV of power consumption, A F500 It is a 500 kV reverse transmission of electricity.

[0115] 2.220 kV power grid: No distributed grid-connected electricity or reverse electricity; the amount of electricity absorbed is equal to the reverse electricity from 10 kV to 220 kV along the line.

[0116] A 220,total =A F，10-220 A F220 =0, A S220 =A F，10-220

[0117] ΔA 220+ =0, ΔA220- =A F，10-220 ×ΔA% 220Up

[0118] Among them, A 220,total For 220 kV grid-connected power, A S220 For the 220 kV power consumption, A F220 For 220 kV reverse transmission of electrical energy, ΔA 220+ For the 220 kV power loss, ΔA 220- To reduce the power loss by 220 kV, ΔA% 220Up For voltage levels above 220 kV, A is the total voltage drop rate. F，10-220 This is the reverse current from 10 kV to 220 kV along the line.

[0119] 3.110 kV power grid: No distributed grid-connected electricity or reverse electricity; the amount of electricity absorbed is equal to the reverse electricity from 10 kV to 110 kV along the line.

[0120] A 110,total =A F，10-110 A F110 =0, A s110 =A F，10-110

[0121] ΔA 110+ =0, ΔA 110- =A F,10-110 ×ΔA% 110Up

[0122] Among them, A 110,total For 110 kV grid-connected power, A S110 For the 110 kV power consumption, A F110 For 110 kV reverse transmission of electrical energy, ΔA 110+ For the 110 kV power loss, ΔA 110- To reduce the power loss by 110 kV, ΔA% 110Up For voltage levels above 110 kV, A is the total voltage drop rate. F,10-110 This is the reverse current from 10 kV to 110 kV along the line.

[0123] 4.35 kV power grid: No distributed grid-connected electricity or reverse electricity; the amount of electricity absorbed is equal to the reverse electricity from 10 kV to 35 kV along the line.

[0124] A 35,total =A F,10-35 A F35 =0, A S35 =A F,10-35

[0125] ΔA 35+ =0, ΔA 35- =AF，10-35 ×ΔA% 35Up

[0126] Among them, A 35,total For 35 kV grid-connected power, A s35 For 35 kV power consumption, A F35 For 35 kV reverse transmission of electricity, ΔA 35+ For the 35 kV power loss, ΔA 35 -Reducing power loss by 35 kV, ΔA% 35Up For voltage levels above 35 kV, A is the total voltage drop rate. F,10-35 This is the reverse current from 10 kV to 35 kV along the line.

[0127] 5.10 kV power grid:

[0128] A 10,total =A G10 +A F,0.38-10

[0129] A F10 =A F,10-35 +A F,10-110 +A F,10-220

[0130] A S10 =A 10,total -A F10

[0131] ΔA 10+ =A F10 ×ΔA% 10 ΔA 10- =A S10 ×ΔA% 10Up

[0132] Among them, A 10，total For 10 kV grid-connected power, A G10 For 10 kV, the electricity generated is from renewable energy sources connected to the grid. S10 For 10 kV of power consumption, A F10 For 10 kV reverse transmission of electrical energy, A F,10-35 A represents the reverse electrical current along the 10 kV line to the 35 kV line. F,10-110 A represents the reverse electrical current along the 10 kV line to 110 kV. F,10-220 The reverse current ΔA is the current flowing from 10 kV to 220 kV along the line. 10+ For the 10 kV power loss, ΔA 10- To reduce the power loss by 10 kV, ΔA% 10Up The total voltage drop rate for voltage levels above 10 kV, ΔA%. 10 The voltage drop rate is 10 kV.

[0133] 6.0.38 kV power grid:

[0134] A 0.38,total =A G0.38 +A G0.22

[0135] A F0.38 =A F,0.38-10

[0136] A S0.38 =A 0.38,total -A F0.38

[0137] ΔA 0.38+ =A F0.38 ×ΔA% 0.38 ΔA 0.38- =A S0.38 ×ΔA% 0.38Up

[0138] Among them, A 0.38，total For 380 volts of power supply to the internet, A G0.38 380 volts is the amount of electricity supplied to the grid by new energy sources, A G0.22 220 volts is the amount of electricity supplied to the grid by new energy sources, A S0.38 For a power consumption of 380 volts, A F0.38 For 380 volts of reverse power transmission, A F,0.38-10 The reverse charge ΔA is the charge along the 380V line to the 10kV line. 0.38+ For the 380-volt power loss, ΔA 0.38- For a 380-volt power loss, ΔA% 0.38Up The total voltage drop rate for voltage levels above 380 volts, ΔA%. 0.38 The voltage drop rate is 380 volts.

[0139] For ease of comparison, the reduced and increased power consumption due to voltage division are calculated according to the formula. In the process of calculating the impact of line loss rate, the power supply is uniformly based on the regional power supply.

[0140] Taking 380 volts as an example, the net power loss ΔA at the 380 volt voltage level 0.38，net- for:

[0141] ΔA 0.38，net- =ΔA 0.38- -ΔA 0.38+

[0142] Loss rate ΔA at 380V voltage level 0.38- %for:

[0143] ΔA 0.38- % = ΔA 0.38- / A total ×100

[0144] The loss rate for a 380-volt voltage level is ΔA. 0.38+ %:

[0145] ΔA 0.38+ % = ΔA 0.38+ / A total ×100

[0146] The net attenuation rate for the 380-volt voltage level is ΔA. 0.38，net- %:

[0147] ΔA 0.38，net- % = ΔA 0.38，net- / A total ×100

[0148] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0149] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0150] Figure 3 A schematic diagram of the structure of the new energy power grid line loss quantification device provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0151] like Figure 3 As shown, the new energy power grid line loss quantification device includes:

[0152] The acquisition unit 31 is used to acquire the new energy ledger information and new energy power data of the target area power grid;

[0153] The first processing unit 32 is used to determine the power transmission path information corresponding to each voltage level in the target area power grid based on the new energy ledger information.

[0154] The second processing unit 33 is used to determine the new energy line loss information of the target area power grid based on the power transmission path information and new energy power data corresponding to each voltage level.

[0155] In one possible implementation, the new energy line loss information includes the regional increase in power loss, the regional decrease in power loss, and the regional net decrease rate of the target area power grid.

[0156] The second processing unit 33 includes:

[0157] The first processing subunit is used to determine the reverse transmission power and total grid-connected power for each voltage level based on the transmission path information and new energy power data corresponding to each voltage level; wherein, the reverse transmission power for each voltage level is the sum of the power transmitted from that voltage level to each higher voltage level through the corresponding transmission path.

[0158] The second processing subunit is used to obtain the regional power loss increase, regional power loss decrease, and regional net power loss rate of the target area power grid based on the reverse transmission power and total grid connection power for each voltage level.

[0159] In one possible implementation, the second processing subunit includes:

[0160] The first processing module is used to determine the amount of electricity consumed at each voltage level based on the reverse transmission electricity and the total grid-connected electricity at each voltage level; wherein, the amount of electricity consumed is the amount of renewable energy consumed at the corresponding voltage level.

[0161] The second processing module is used to obtain the increased and decreased power consumption for each voltage level based on the reverse transmission power consumption and the absorbed power consumption for each voltage level. The increased power consumption is the power loss that increases during the transmission of reverse power consumption in the conductor, and the decreased power consumption is the power loss that is reduced when supplying power to higher voltage levels.

[0162] The third processing module is used to determine the regional increase in power loss, the regional decrease in power loss, and the regional net decrease rate of the power grid in the target area based on the increase in power loss and decrease in power loss corresponding to each voltage level.

[0163] In one possible implementation, the first processing module is specifically used for:

[0164] The total grid-connected power and the reverse transmission power for each voltage level are subtracted to determine the power consumption for each voltage level.

[0165] In one possible implementation, the second processing module includes:

[0166] The first calculation submodule is used to calculate the increased power loss at each voltage level by multiplying the reverse transmission power at each voltage level with the voltage level voltage division loss rate corresponding to that voltage level.

[0167] The second calculation submodule is used to multiply the power consumption of each voltage level with the total voltage loss rate of the voltage levels above the voltage level to determine the power loss reduction of each voltage level.

[0168] In one possible implementation, the third processing module includes:

[0169] The third calculation submodule is used to perform numerical summation of the power loss corresponding to each voltage level in the target area power grid to determine the regional power loss of the target area power grid.

[0170] The fourth calculation submodule is used to perform numerical summation of the power loss corresponding to each voltage level in the target area power grid to determine the regional power loss of the target area power grid.

[0171] The fifth calculation submodule is used to subtract the regional power loss from the regional power loss to determine the net power loss of the target area's power grid, and to determine the regional net power loss rate based on the net power loss and the regional power supply of the target area's power grid.

[0172] In one possible implementation, after the second processing unit 33, the apparatus further includes:

[0173] The third processing unit is used to conduct a feasibility analysis of loss reduction for the target area power grid based on the new energy line loss information, the new energy ledger information, and the new energy power generation data of the target area power grid, and to generate a technical loss reduction report for the target area power grid.

[0174] In one possible implementation, the first processing subunit is specifically used for:

[0175] Based on the transmission path information corresponding to each voltage level, the sum of the electricity transmitted from each voltage level to other higher voltage levels in the new energy power data is determined, as well as the total grid-connected electricity of each voltage level, and the sum of the electricity is used as the reverse transmission electricity corresponding to the voltage level.

[0176] In one possible implementation, the new energy ledger information includes the distribution area, access information, and line information of each load point in the target area's power grid.

[0177] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0178] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0179] If a module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various new energy line loss method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory, random access memory, electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0180] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for quantifying line losses in a new energy power grid, characterized in that, The method includes: Obtain renewable energy ledger information and renewable energy power data for the target area's power grid; Based on the new energy ledger information, determine the power transmission path information corresponding to each voltage level in the target area power grid; Based on the transmission path information corresponding to each voltage level and the new energy power data, the reverse transmission power and total grid-connected power of each voltage level are determined; wherein, the reverse transmission power of each voltage level is the sum of the power transmitted from that voltage level to each higher voltage level through the corresponding transmission path. The total grid-connected power and the reverse transmission power for each voltage level are subtracted to determine the power consumption for each voltage level; the power consumption refers to the renewable energy power consumed by the corresponding voltage level. The reverse transmission power of each voltage level is multiplied by the voltage level drop loss rate corresponding to that voltage level to determine the additional power loss of each voltage level; the additional power loss is the power loss that increases during the transmission of reverse transmission power through the conductor. The power consumption of each voltage level is multiplied by the total voltage drop rate of the voltage levels above the voltage level to determine the power loss reduction of each voltage level; the power loss reduction is the power loss of transmission and distribution when supplying power downward from higher voltage levels, which is reduced by the power consumption. Based on the increased and decreased electricity losses corresponding to each voltage level, the regional increased electricity losses, regional decreased electricity losses, and regional net loss reduction rate of the target area power grid are determined.

2. The method according to claim 1, characterized in that, The step of determining the regional increase in power loss, regional decrease in power loss, and regional net loss rate of the target area power grid based on the increase and decrease in power loss corresponding to each voltage level includes: The power loss increase corresponding to each voltage level in the target area power grid is numerically summed to determine the regional power loss increase of the target area power grid. The power loss reduction corresponding to each voltage level in the target area power grid is numerically summed to determine the regional power loss reduction of the target area power grid. The net power loss of the target area's power grid is determined by subtracting the power loss of the target area's power grid from the power loss of the target area's power grid. The net power loss rate of the target area is then determined based on the net power loss and the regional power supply of the target area's power grid.

3. The method according to any one of claims 1 or 2, characterized in that, After determining the renewable energy line loss information of the target area power grid based on the power transmission path information corresponding to each voltage level and the renewable energy power data, the method further includes: Based on the renewable energy line loss information, renewable energy ledger information, and renewable energy power data of the target area power grid, a loss reduction feasibility analysis is conducted on the target area power grid, and a corresponding technical loss reduction report is generated for the target area power grid.

4. The method according to any one of claims 1 or 2, characterized in that, The new energy ledger information includes the distribution area, access information, and line information of each load point in the target area power grid.

5. A device for quantifying line losses in a new energy power grid, characterized in that, The device includes: The acquisition unit is used to acquire new energy ledger information and new energy power data of the target area power grid; The first processing unit is used to determine the power transmission path information corresponding to each voltage level in the target area power grid based on the new energy ledger information. The second processing unit is specifically used to: determine the reverse transmission power and total grid-connected power for each voltage level based on the transmission path information corresponding to each voltage level and the new energy power data; wherein, the reverse transmission power for each voltage level is the sum of the power transmitted from that voltage level to each higher voltage level through the corresponding transmission path. The total grid-connected power and the reverse transmission power for each voltage level are subtracted to determine the power consumption for each voltage level; the power consumption refers to the renewable energy power consumed by the corresponding voltage level. The reverse transmission power of each voltage level is multiplied by the voltage level drop loss rate corresponding to that voltage level to determine the additional power loss of each voltage level; the additional power loss is the power loss that increases during the transmission of reverse transmission power through the conductor. The power consumption of each voltage level is multiplied by the total voltage drop rate of the voltage levels above the voltage level to determine the power loss reduction of each voltage level; the power loss reduction is the power loss of transmission and distribution when supplying power downward from higher voltage levels, which is reduced by the power consumption. Based on the increased and decreased electricity losses corresponding to each voltage level, the regional increased electricity losses, regional decreased electricity losses, and regional net loss reduction rate of the target area power grid are determined.

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