Distribution network line loss allocation method, electronic equipment and storage medium

Abstract

The present invention provides a distribution network line loss allocation method, electronic device and storage medium. The method comprises: obtaining the time-division electricity structure distribution diagram of each distribution transformer and each power supply node under the target traditional power supply in the distribution network according to the time period; calculating the load center distance index and the electricity structure index of all power supply nodes under the target traditional power supply according to the topological structure and the time-division electricity structure distribution diagram of the distribution network; obtaining the line loss allocation correction coefficient of all power supply nodes in the distribution network according to the load center distance index and the electricity structure index; and allocating the line loss to each power supply node in the distribution network according to the line loss allocation correction coefficient. The data used in the present invention are all commonly collected data in the actual power grid operation, and the indicators are easy to calculate and obtain, and the line loss of the distribution network can be reasonably allocated under the calculation conditions of the medium and low voltage distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid loss analysis, and in particular to a distribution network line loss allocation method, electronic equipment and storage medium. Background Art

[0002] Line loss is the current loss caused by factors such as the distribution network structure and operating environment during the operation of the distribution network. Scientific and reasonable calculation of line loss is an important basis for distribution network planning, economic operation, and grid transformation. As the proportion of new energy in the energy structure increases, the power supply mode of medium and low voltage distribution networks has gradually evolved into a multi-source network that simultaneously supplies power from traditional power sources and non-traditional power sources (such as wind power, distributed power sources, etc.). However, the connection of non-traditional power sources to the distribution network will change the line loss.

[0003] The line loss allocation methods currently widely used include the average network loss coefficient method, the power flow tracking method, and the marginal network loss coefficient method. Among them, the average network loss coefficient method adopts the idea of ​​average allocation, and allocates the network loss among users according to the load power size and the same network loss coefficient. It is easy to understand and simple to implement. However, it can only allocate the network loss to the power node or the load node, and cannot realize the joint allocation of the power source and the load, and cannot consider the impact of non-traditional power access on the line loss. It is not suitable for distribution networks containing non-traditional power sources. The power flow tracking method is a topological analysis method that can track the system power flow and can also be applied to distribution networks containing non-traditional power sources, but the power flow tracking method has high requirements for calculation conditions and data acquisition is difficult. The marginal network loss coefficient method is a sensitivity method that allocates the network loss of the entire network to generators and load nodes. According to the access mode and operation control of non-traditional power sources to the power grid, non-traditional power sources can be used as PQ nodes, PV nodes or balancing nodes, and the Jacobian matrix obtained through power flow calculation can be used to obtain the reactive and active marginal network loss coefficients of each node in the system, and then the line loss size shared by each node can be obtained. However, this method has certain difficulties in algorithm and calculation simplicity. In addition, the sum of the network loss shared by each node calculated by this method is not equal to the actual total network loss of the system, which will cause excessive recovery of network loss costs.

[0004] Therefore, for distribution networks containing non-traditional power sources, the current line loss allocation method has problems such as difficulty in collecting active and reactive power at load nodes, complex flow calculations, and difficulty in quantifying line loss allocation. It is difficult to reasonably allocate line losses for distribution networks based on the calculation conditions of medium and low voltage distribution networks. Summary of the invention

[0005] The embodiments of the present invention provide a distribution network line loss allocation method, an electronic device and a storage medium to solve the problem that the current line loss allocation method is difficult to reasonably allocate the line loss of the distribution network based on the calculation conditions of the medium and low voltage distribution network.

[0006] In a first aspect, an embodiment of the present invention provides a method for allocating line losses in a distribution network, comprising:

[0007] Obtaining a time-division electricity structure distribution diagram of each distribution transformer and each power supply node under the target traditional power supply in the distribution network according to time periods; the power supply nodes include traditional power supply nodes and non-traditional power supply nodes;

[0008] According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the load center distance index and the electricity structure index of all power supply nodes under the target traditional power supply are calculated, wherein the load center distance index represents the distance between all power supply equivalent access points and the equivalent load center of the distribution network, and the electricity structure index represents the influence of all power supply electricity on the load of the distribution network;

[0009] According to the load center distance index and the power structure index, a line loss allocation correction coefficient of all power supply nodes under the target traditional power supply in the distribution network is obtained;

[0010] Line loss is allocated to each power supply node in the distribution network according to the line loss allocation correction coefficient.

[0011] In a possible implementation, according to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the load center distance index of all power supply nodes under the target traditional power supply is calculated, including:

[0012] According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, determine the first active electricity of each distribution transformer under the target traditional power source and the second active electricity of each power node in each time period, the first line segment length of each distribution line segment from the distribution network head end corresponding to the target traditional power source to each distribution transformer in the distribution network in each time period, and the second line segment length of each distribution line segment from the distribution network head end to each power node in each time period;

[0013] Calculate the distribution network equivalent load center distance and all power access point equivalent distances corresponding to each time period according to the first active power, the second active power, the first line segment length, and the second line segment length corresponding to each time period;

[0014] Calculate the first load center distance index corresponding to each time period according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points;

[0015] The average value of all the first load center distance indexes that are not zero is calculated to obtain the load center distance indexes of all power supply nodes under the target traditional power supply.

[0016] In a possible implementation, calculating the distribution network equivalent load center distance and all power access point equivalent distances corresponding to each time period according to the first active power, the second active power, the first line segment length, and the second line segment length corresponding to each time period includes:

[0017] according to Calculate the distribution network equivalent load center distance corresponding to the qth period;

[0018] according to Calculate the equivalent distances of all power access points corresponding to the qth time period;

[0019] Among them, L cq represents the equivalent load center distance of the distribution network corresponding to the qth period, W j represents the first active power of the jth distribution transformer under the target traditional power source, L d represents the length of the first line segment of the dth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the jth distribution transformer, j = 1, 2, ..., m, m represents the total number of distribution transformers under the target traditional power source, d = 1, 2, ..., m j , m j represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the jth distribution transformer; L psq represents the equivalent distance of all power access points corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, L k represents the second line segment length of the kth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the i-th power source node, i = 1, 2, ..., n, n represents the total number of all power source nodes under the target traditional power source, k = 1, 2, ..., n i , n i Represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the i-th power source node.

[0020] In a possible implementation, the first load center distance index corresponding to each time period is calculated according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points, including:

[0021] According to L Wq =|L cq -L psq | / L cq , calculate the first load center distance index corresponding to the qth period;

[0022] Among them, LWq Represents the first load center distance index corresponding to the qth time period.

[0023] In a possible implementation, according to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the electricity structure index of all power supply nodes under the target traditional power supply is calculated, including:

[0024] Calculating the power penetration index and the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period;

[0025] The product of the power penetration index and the power distribution width index is calculated to obtain the power structure index of all power supply nodes under the target traditional power supply.

[0026] In a possible implementation, calculating the power penetration index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period includes:

[0027] according to Calculating the power penetration index of all power supply nodes under the target traditional power supply;

[0028] Among them, H a represents the power penetration index of all power nodes under the target traditional power supply, H q represents the power penetration index corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, W j represents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

[0029] In a possible implementation, calculating the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period includes:

[0030] according to Calculating the power distribution width index of all power supply nodes under the target traditional power supply;

[0031] Among them, W a It represents the power distribution width index of all power nodes under the target traditional power supply, W psirepresents the second active power of the i-th power node under the target traditional power source, W j represents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

[0032] In a possible implementation, allocating line losses to each power supply node in the distribution network according to the line loss allocation correction coefficient includes:

[0033] Calculate the first shared network loss of all power supply nodes under the target traditional power supply in the distribution network according to the line loss sharing correction coefficient and the total shared network loss of all time periods of the distribution network;

[0034] Allocate the first shared network loss according to the power generation power of each power node under the target traditional power source, and determine the shared line loss of each power node under the target traditional power source;

[0035] The shared line loss of the target traditional power source is determined according to the total shared network loss and the first shared network loss.

[0036] In a second aspect, an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the processor implements the steps of the method described in the first aspect or any possible implementation manner of the first aspect.

[0037] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0038] The embodiment of the present invention provides a distribution network line loss allocation method, electronic device and storage medium, which obtains the time period electricity structure distribution diagram of each distribution transformer and each power node under the target traditional power source in the distribution network according to the time period; calculates the load center distance index and the electricity structure index of all power nodes under the target traditional power source according to the topological structure of the distribution network and the time period electricity structure distribution diagram; obtains the line loss allocation correction coefficient of all power nodes under the target traditional power source in the distribution network according to the load center distance index and the electricity structure index; and allocates the line loss to each power node in the distribution network according to the line loss allocation correction coefficient. The embodiment of the present invention calculates the load center distance index and the power structure index of all power nodes under the target traditional power source based on the time period power structure distribution diagram of each distribution transformer and each power node under the target traditional power source and the topological structure of the distribution network. According to the load center distance index and the power structure index, the line loss allocation correction coefficient of all power nodes under the target traditional power source in the distribution network is obtained. The data used are all commonly collected data in the actual power grid operation, and the indicators are easy to calculate and obtain. Based on the line loss allocation correction coefficient, the influence of the joint action of the target traditional power source and each power node under the target traditional power source on the operating state of the distribution network is fully considered. Under the calculation conditions of the medium and low voltage distribution network, the line loss of the distribution network can be reasonably allocated. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 is a flow chart of the implementation of the distribution network line loss allocation method provided by an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of a topological structure of a distribution network provided by an embodiment of the present invention;

[0042] Figure 3 It is a time-divided electricity structure distribution diagram provided by an embodiment of the present invention;

[0043] Figure 4 It is a structural schematic diagram of a distribution network line loss allocation device provided by an embodiment of the present invention;

[0044] Figure 5 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0047] See also Figure 1 , which shows a flow chart of the implementation of the distribution network line loss allocation method provided by an embodiment of the present invention, which is described in detail as follows:

[0048] In step 101, the time-divided electricity structure distribution diagrams of each distribution transformer and each power supply node under the target traditional power source in the distribution network are obtained according to the time periods.

[0049] The power supply nodes under the target traditional power supply may include traditional power supply nodes, and may also include non-traditional power supply nodes, such as distributed power supply nodes, wind power nodes, etc.

[0050] In the medium and low voltage distribution network, the topology of the distribution network usually has only one traditional power source, namely the target traditional power source, and all other non-traditional power source nodes are located on the distribution transformer nodes under the traditional power source. If the traditional power source is also connected to other traditional power sources, the other traditional power source nodes connected to the traditional power source can be regarded as power source nodes under the traditional power source. Therefore, the distribution network head end corresponding to a traditional power source is used as the network loss allocation benchmark, and the time period electricity structure distribution diagram of each distribution transformer and each power source node under the distribution network head end corresponding to the target traditional power source in the distribution network is obtained according to the time period.

[0051] On this basis, we can draw a time-based electricity structure distribution diagram based on the topological structure of the distribution network, or directly collect the electricity at the head end of the distribution network, each power node and distribution transformer gateway corresponding to the target traditional power source in different time periods.

[0052] Among them, the electricity quantity at the head end of the distribution network corresponding to the traditional power source collected can be used to calculate the total shared network loss in all subsequent distribution network periods.

[0053] In step 102, based on the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the load center distance index and the electricity structure index of all power supply nodes under the target traditional power supply are calculated.

[0054] Among them, the load center distance index represents the distance between all power source equivalent access points and the equivalent load center of the distribution network, and the power structure index represents the impact of all power sources on the load of the distribution network.

[0055] Optionally, according to the topological structure of the distribution network and the time-division electricity structure distribution diagram, the load center distance index of all power supply nodes under the target traditional power supply is calculated, which may include:

[0056] According to the topological structure of the distribution network and the distribution diagram of the power structure in different time periods, the first active power of each distribution transformer under the target traditional power source and the second active power of each power node in each time period are determined, as well as the first segment length of each distribution line segment from the head end of the distribution network corresponding to the target traditional power source to each distribution transformer in each time period, and the second segment length of each distribution line segment from the head end of the distribution network corresponding to the target traditional power source to each power node in each time period.

[0057] According to the first active power, the second active power, the first line segment length and the second line segment length corresponding to each time period, the distribution network equivalent load center distance and the equivalent distances of all power access points corresponding to each time period are calculated.

[0058] According to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points, the first load center distance index corresponding to each time period is calculated.

[0059] The average value of all non-zero first load center distance indices is calculated to obtain the load center distance indices of all power supply nodes under the target traditional power supply.

[0060] Optionally, calculating the distribution network equivalent load center distance and all power access point equivalent distances corresponding to each time period according to the first active power, the second active power, the first line segment length, and the second line segment length corresponding to each time period may include:

[0061] according to Calculate the equivalent load center distance of the distribution network corresponding to the qth time period.

[0062] according to Calculate the equivalent distances of all power access points corresponding to the qth time period.

[0063] Among them, L cq represents the equivalent load center distance of the distribution network corresponding to the qth period, W j represents the first active power of the jth distribution transformer under the target traditional power supply, L drepresents the length of the first line segment of the dth distribution line segment from the distribution network head end corresponding to the target traditional power source to the jth distribution transformer in the distribution network, j = 1, 2, ..., m, m represents the total number of distribution transformers under the target traditional power source, d = 1, 2, ..., m j , m j represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the jth distribution transformer; L psq represents the equivalent distance of all power access points corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source. For example, if the i-th power node is a distributed power node, when the distributed power is connected to the grid, W psi It can take negative values. When the distributed power is off the grid, W psi Can take positive value, L k It represents the length of the second line segment of the kth distribution line segment from the distribution network head end corresponding to the target traditional power source to the i-th power source node in the distribution network, i = 1, 2, ..., n, n represents the total number of all power source nodes under the target traditional power source, k = 1, 2, ..., n i , n i Represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the i-th power source node.

[0064] Optionally, calculating the first load center distance index corresponding to each time period according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points may include:

[0065] According to L Wq =|L cq -L psq | / L cq , calculate the first load center distance index corresponding to the qth time period.

[0066] Among them, L Wq Represents the first load center distance index corresponding to the qth time period.

[0067] According to the above calculation, the first load center distance index L corresponding to each time period is obtained Wq After that, the average value of all the first load center distance indices that are not zero can be calculated to obtain the load center distance index L of all power supply nodes under the target traditional power supply. W :

[0068]

[0069] Among them, Q1 represents the first load center distance index L in all time periods of the distribution network Wq The total number of time periods that are not zero.

[0070] In this embodiment, the load center distance index L of all power supply nodes under the target traditional power supply is defined as W To measure the degree to which all power access points and power under the target traditional power source are close to the load center of the distribution network, the load center distance index L of all power nodes under the target traditional power source is W It can describe the distance between all power supply equivalent access points and the equivalent load center of the distribution network. The load center distance index L W The smaller it is, the closer all power source equivalent access points are to the equivalent load center of the distribution network, which is more conducive to the power consumption of all power sources, and the smaller the loss caused by the Internet transmission process of each power source node.

[0071] In this embodiment, it is considered that the distribution network may include distributed power sources. Due to the intermittent and unstable output of the distributed power sources, the transformers connected to them have a bidirectional flow of power either online or offline. Therefore, the power consumption of each power node is counted according to the time period to ensure that the power flow direction of the distributed power sources under the target traditional power source in the distribution network calculated in each time period remains basically unchanged.

[0072] Optionally, according to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the electricity structure index of all power supply nodes under the target traditional power supply is calculated, which may include:

[0073] According to all the first active power and all the second active power corresponding to each time period, the power penetration index and the power distribution width index of all power supply nodes under the target traditional power supply are calculated.

[0074] The product of the power penetration index and the power distribution width index is calculated to obtain the power structure index of all power nodes under the target traditional power supply.

[0075] Optionally, calculating the power penetration index of all power supply nodes under the target traditional power supply according to all the first active power quantities and all the second active power quantities corresponding to each time period may include:

[0076] according to Calculate the power penetration index of all power nodes under the target traditional power supply.

[0077] Among them, H a It represents the power penetration index of all power nodes under the target traditional power supply, H q It represents the electricity penetration index corresponding to the qth time period, q = 1, 2, ..., Q, and Q represents the total number of all time periods divided by the distribution network.

[0078] Optionally, calculating the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power quantities and all the second active power quantities corresponding to each time period may include:

[0079] according to Calculate the power distribution width index of all power nodes under the target traditional power supply.

[0080] Among them, W a Represents the power distribution width index of all power nodes under the target traditional power supply.

[0081] Among them, based on the calculation formula of the power penetration index and the power distribution width index, according to E a =H a ×W a Calculate the power structure index E of all power nodes under the target traditional power supply a .

[0082] In this embodiment, in order to further determine the influence of the power of each power node under the target traditional power source on the time-sharing load of the distribution network, and the consumption level of each power node under the target traditional power source, the power structure index is used to describe it.

[0083] Among them, from the time-based electricity structure distribution diagram, the electricity penetration index can describe the proportion of the time-based electricity of each power node included in the distribution network to the total electricity of the distribution transformer gateway in that period. The electricity penetration index H is calculated a The higher the value, the higher the penetration rate of each power node under the target traditional power source, and the more losses are generated. The power distribution width index can describe the dispersed distribution of the time-divided power of each power node under the target traditional power source included in the distribution network during the entire power collection time period. The power distribution width index W a The higher the value, the more balanced the distribution of electricity of each power source node under the target traditional power source in each time period, the more conducive it is to the power consumption of each power source under the target traditional power source, and the smaller the loss generated. For example, when the total on-grid power of distributed power sources under the target traditional power source is fixed on a certain day, the power distribution width index of the distributed power source evenly distributed in each time period is smaller than the power distribution width index of the distributed power source concentrated in some time periods. Therefore, the more dispersed the power distribution of distributed power sources, the smaller the power distribution width index, the smaller the power structure index, and the lower the line loss allocation correction coefficient based on the power structure index and the load center distance index, the more reasonable the line loss allocation for distributed power sources in the distribution network can be.

[0084] In step 103, the line loss allocation correction coefficients of all power supply nodes under the target traditional power supply in the distribution network are obtained according to the load center distance index and the power structure index.

[0085] In this embodiment, according to the load center distance index and the power structure index determined in the above step 102, all power consumption under the target traditional power source and the impact on the distribution line loss are comprehensively considered to construct the line loss allocation correction coefficient k of all power nodes under the target traditional power source. W :

[0086] k W =L W +E a ;

[0087] Exemplarily, in the case where all power supply nodes under the target traditional power supply are distributed power supply nodes, this embodiment introduces the output of distributed power supply as part of the power supply capacity of the distribution network, and introduces it into the network loss sharing, and shares the total shared network loss of the distribution network according to the contribution ratio of the power of the traditional power supply node and the distributed power supply node to the loss. Based on the time period power structure distribution diagram, the time and spatial distribution characteristics of the distributed power supply grid power are analyzed, and the impact of access capacity and location changes on the distribution network loss are comprehensively considered. From the perspective of energy consumption, the line loss sharing correction coefficient is calculated based on the comprehensive effect of the three variables of the load center distance index, power penetration index and power distribution width index of the distributed power supply.

[0088] In step 104, line loss is allocated to each power node in the distribution network according to the line loss allocation correction coefficient.

[0089] Optionally, line loss allocation is performed on each power node in the distribution network according to the line loss allocation correction coefficient, including:

[0090] According to the line loss allocation correction coefficient and the total allocated network loss of all time periods of the distribution network, the first allocated network loss of all power supply nodes under the target traditional power supply in the distribution network is calculated.

[0091] The first shared network loss is shared according to the power generation power of each power node under the target traditional power source, and the shared line loss of each power node under the target traditional power source is determined.

[0092] The shared line loss of the target traditional power source is determined based on the total shared network loss and the first shared network loss.

[0093] Among them, according to W LG =k W W L Calculate the first shared network loss of all power nodes under the target traditional power source in the distribution network.

[0094] Among them, W LG represents the first shared network loss, W L It represents the total shared network loss of the distribution network in all time periods.

[0095] Generally speaking, in medium and low voltage distribution networks, network loss sharing is usually carried out between a traditional power source corresponding to a target traditional power source and the distributed power sources under the traditional power source. If the traditional power source corresponding to the target traditional power source is also connected to other traditional power sources, the other traditional power sources can be regarded as power supply nodes under the target traditional power source for network loss sharing.

[0096] On this basis, the power generation of each power node under the target traditional power supply can be obtained, and the corresponding apportioned line loss W of each power node can be calculated according to the proportion of the power generation of each power node. LGi :

[0097]

[0098] Among them, W Gi Represents the power generation of the i-th power node.

[0099] On this basis, the shared line loss W corresponding to each power node is calculated LGi After that, according to W LP =W L -W LG Calculate the shared line loss W of the target traditional power supply LP .

[0100] The above distribution network line loss allocation method is further described below through specific embodiments.

[0101] Taking the actual distribution network line in a certain place as an example, the topological structure of the distribution network is shown in Figure 2 The distribution network line loss allocation method according to the embodiment of the present invention is applied to allocate line losses in a distribution network of a multi-power network including traditional power sources and non-traditional power sources. Figure 2 As shown in the figure, node 1 is the head end of the distribution network corresponding to the target traditional power source, with a voltage level of 10kV, 1 trunk line, 6 branch lines, 9 distribution transformers, a total of 22 nodes, and a power factor of 0.95. This example assumes that the distributed power access point is the 19th node, with a rated capacity of 600kW and a power factor of 0.98.

[0102] A typical day was selected for analysis. The low-voltage load and distributed power supply operation data were collected at one-hour intervals, and the power structure distribution diagram was drawn by time period. Figure 3 The distribution network line loss allocation method according to the embodiment of the present invention calculates relevant parameters (i.e., load center distance index and power structure index), and the power collection data and data processing results are shown in Table 1. Since the light intensity between 1-6h and 19-24h is weak, the output of the distributed power source is close to zero, so Table 1 only lists the data sequence under the distributed output condition.

[0103] Table 1 Calculation of load and parameters of distribution network for 7-18 hours

[0104]

[0105] According to the above parameters and the active power of the distributed generation, the distribution network line loss allocation method according to the embodiment of the present invention is applied to calculate the load center distance index and the power structure index of the divided time periods. The calculation results are shown in Table 2.

[0106] Table 2 Calculation of definition parameters for distributed power access

[0107]

[0108] According to the time period definition parameters in Table 2, the load center distance index L of all power supply nodes under the target traditional power supply is obtained. W =0.073, power penetration index H a =0.750, power distribution width index W a =0.121.

[0109] Therefore, based on step 103, the line loss allocation correction coefficient k of all power supply nodes under the target traditional power supply in the distribution network is calculated as follows: W =0.164.

[0110] According to the line loss allocation correction coefficient of all power supply nodes under the target traditional power supply in the distribution network, the first allocated network loss W of all power supply nodes under the target traditional power supply in the distribution network is calculated according to step 104. LG =0.164×96.97=15.862.

[0111] This example only assumes that there is a distributed generation at the 19th node, so the shared line loss of the distributed generation is 15.862kWh.

[0112] On this basis, the apportioned line loss of the target traditional power supply can be calculated as follows:

[0113] W LP =96.97-15.86=81.11;

[0114] That is, the apportioned line loss of the target traditional power source is 81.11kWh. From the line loss apportionment results, the line loss apportionment of the distributed power source only accounts for 16.4% of the total loss, which is relatively small. The main influencing factor is that the distributed power access point is closer to the load center of the distribution network, and the calculated value of the load distance index is small. In order to compare the apportionment changes, if the distributed power access point is located at node 2 of the network topology, and other conditions remain unchanged, then after calculating L W =0.383, k W =0.474. Distributed power generation line loss W LG=45.96, it can be seen that the load center distance index has a more obvious impact on the line loss allocation of distributed generation.

[0115] Based on this example, we can also verify the influence of the electricity structure index on line loss allocation. The lower the electricity penetration index, the more balanced the electricity distribution, the smaller the allocation coefficient, and the smaller the allocated loss.

[0116] The embodiment of the present invention collects the operation data of the distribution network, calculates the load center distance index and the power structure index of all power nodes under the target traditional power source based on the time period power structure distribution diagram of each distribution transformer and each power node under the target traditional power source, and obtains the line loss allocation correction coefficient of all power nodes in the distribution network according to the load center distance index and the power structure index. The data used are all the commonly collected data in the actual power grid operation, the indicators are easy to calculate and obtain, and there is no need to carry out complex power flow calculations. Moreover, based on the line loss allocation correction coefficient, the influence of the joint action of each power node and the target traditional power source on the operation state of the distribution network can be fully considered. The calculation process does not involve human participation, which ensures the fairness of the distribution network line loss allocation calculation. Under the calculation conditions of the medium and low voltage distribution network, the line loss of the distribution network can be reasonably allocated. It is suitable for the current continuously opening power market environment, and can guide the planning of distributed power sources in the access mode, access capacity, etc. towards the direction that is conducive to the green energy saving of the current power grid, so as to achieve the purpose of more favorable consumption of distributed power sources and other power sources and reduce the loss of the distribution network, which is more conducive to the healthy development of the distribution network under the new energy power system.

[0117] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean 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 embodiment of the present invention.

[0118] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0119] Figure 4 The structure diagram of the distribution network line loss allocation device provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0120] like Figure 4 As shown, the distribution network line loss allocation device includes: an acquisition module 41, a first processing module 42, a second processing module 43 and an allocation module 44.

[0121] An acquisition module 41 is used to acquire, according to time periods, a time-divided electricity structure distribution diagram of each distribution transformer and each power supply node under a target traditional power supply in a distribution network; the power supply node includes a traditional power supply node and a non-traditional power supply node;

[0122] The first processing module 42 is used to calculate the load center distance index and the power structure index of all power supply nodes under the target traditional power supply according to the topological structure of the distribution network and the time-divided power structure distribution diagram, wherein the load center distance index represents the distance between all power supply equivalent access points and the equivalent load center of the distribution network, and the power structure index represents the influence of all power supply power on the load of the distribution network;

[0123] A second processing module 43 is used to obtain a line loss allocation correction coefficient of all power supply nodes under the target traditional power supply in the distribution network according to the load center distance index and the power structure index;

[0124] The allocation module 44 is used to allocate the line loss to each power supply node in the distribution network according to the line loss allocation correction coefficient.

[0125] The embodiment of the present invention obtains the time-based electricity structure distribution diagram of each distribution transformer and each power node under the target traditional power source in the distribution network according to the time period; calculates the load center distance index and the electricity structure index of all power nodes under the target traditional power source according to the topological structure of the distribution network and the time-based electricity structure distribution diagram; obtains the line loss allocation correction coefficient of all power nodes under the target traditional power source in the distribution network according to the load center distance index and the electricity structure index; and allocates the line loss to each power node in the distribution network according to the line loss allocation correction coefficient. The embodiment of the present invention calculates the load center distance index and the power structure index of all power nodes under the target traditional power source based on the time period power structure distribution diagram of each distribution transformer and each power node under the target traditional power source and the topological structure of the distribution network. According to the load center distance index and the power structure index, the line loss allocation correction coefficient of all power nodes under the target traditional power source in the distribution network is obtained. The data used are all commonly collected data in the actual power grid operation, and the indicators are easy to calculate and obtain. Based on the line loss allocation correction coefficient, the influence of the joint action of the target traditional power source and each power node under the target traditional power source on the operating state of the distribution network is fully considered. Under the calculation conditions of the medium and low voltage distribution network, the line loss of the distribution network can be reasonably allocated.

[0126] In a possible implementation, the first processing module 42 may be used to

[0127] According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, determine the first active electricity of each distribution transformer under the target traditional power source and the second active electricity of each power node in each time period, the first line segment length of each distribution line segment from the distribution network head end corresponding to the target traditional power source to each distribution transformer in the distribution network in each time period, and the second line segment length of each distribution line segment from the distribution network head end to each power node in each time period;

[0128] Calculate the distribution network equivalent load center distance and all power access point equivalent distances corresponding to each time period according to the first active power, the second active power, the first line segment length, and the second line segment length corresponding to each time period;

[0129] Calculate the first load center distance index corresponding to each time period according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points;

[0130] The average value of all the first load center distance indexes that are not zero is calculated to obtain the load center distance indexes of all power supply nodes under the target traditional power supply.

[0131] In a possible implementation, the first processing module 42 may be configured to: Calculate the distribution network equivalent load center distance corresponding to the qth period;

[0132] according to Calculate the equivalent distances of all power access points corresponding to the qth time period;

[0133] Among them, L cq represents the equivalent load center distance of the distribution network corresponding to the qth period, W j represents the first active power of the jth distribution transformer under the target traditional power source, L d represents the length of the first line segment of the dth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the jth distribution transformer, j = 1, 2, ..., m, m represents the total number of distribution transformers under the target traditional power source, d = 1, 2, ..., m j , m j represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the jth distribution transformer; L psq represents the equivalent distance of all power access points corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, L k represents the second line segment length of the kth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the i-th power source node, i = 1, 2, ..., n, n represents the total number of all power source nodes under the target traditional power source, k = 1, 2, ..., n i , n i Represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the i-th power source node.

[0134] In a possible implementation, the first processing module 42 may be configured to process the Wq =|Lcq -L psq | / L cq , calculate the first load center distance index corresponding to the qth period;

[0135] Among them, L Wq Represents the first load center distance index corresponding to the qth time period.

[0136] In a possible implementation, the first processing module 42 may be configured to calculate the power penetration index and the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period;

[0137] The product of the power penetration index and the power distribution width index is calculated to obtain the power structure index of all power supply nodes under the target traditional power supply.

[0138] In a possible implementation, the first processing module 42 may be configured to: Calculating the power penetration index of all power supply nodes under the target traditional power supply;

[0139] Among them, H a represents the power penetration index of all power nodes under the target traditional power supply, H q represents the power penetration index corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, W j represents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

[0140] In a possible implementation, the first processing module 42 may be configured to: Calculating the power distribution width index of all power supply nodes under the target traditional power supply;

[0141] Among them, W a It represents the power distribution width index of all power nodes under the target traditional power supply, W psi represents the second active power of the i-th power node under the target traditional power source, W jrepresents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

[0142] In a possible implementation, the apportionment module 44 may be configured to calculate the first apportioned network loss of all power supply nodes under the target traditional power supply in the distribution network according to the line loss apportionment correction coefficient and the total apportioned network loss of all time periods of the distribution network;

[0143] Allocate the first shared network loss according to the power generation power of each power node under the target traditional power source, and determine the shared line loss of each power node under the target traditional power source;

[0144] The shared line loss of the target traditional power source is determined according to the total shared network loss and the first shared network loss.

[0145] Figure 5 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 5 As shown, the electronic device 5 of this embodiment includes: a processor 50, a memory 51, and a computer program 52 stored in the memory 51 and executable on the processor 50. When the processor 50 executes the computer program 52, the steps in the above-mentioned various power distribution network line loss allocation method embodiments are implemented, for example Figure 1 Alternatively, when the processor 50 executes the computer program 52, the functions of each module / unit in the above-mentioned device embodiments are realized, for example Figure 4 Functionality of the modules / units 41 to 44 shown.

[0146] Exemplarily, the computer program 52 may be divided into one or more modules / units, which are stored in the memory 51 and executed by the processor 50 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 52 in the electronic device 5. For example, the computer program 52 may be divided into Figure 4 Modules / units 41 to 44 are shown.

[0147] The electronic device 5 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The electronic device 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will appreciate that Figure 5It is only an example of the electronic device 5 and does not constitute a limitation of the electronic device 5. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0148] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0149] The memory 51 may be an internal storage unit of the electronic device 5, such as a hard disk or memory of the electronic device 5. The memory 51 may also be an external storage device of the electronic device 5, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 5. Further, the memory 51 may also include both an internal storage unit of the electronic device 5 and an external storage device. The memory 51 is used to store the computer program and other programs and data required by the electronic device. The memory 51 may also be used to temporarily store data that has been output or is to be output.

[0150] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0151] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0152] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0153] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0154] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0156] If the integrated module / unit is implemented in the form of 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, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned distribution network line loss allocation method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0157] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for allocating line losses in a distribution network, characterized in that: include: Obtain the time-divided electricity structure distribution diagram of each distribution transformer and each power node under the target traditional power source in the distribution network according to the time period; The power supply nodes include traditional power supply nodes and non-traditional power supply nodes; According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the load center distance index and the electricity structure index of all power supply nodes under the target traditional power supply are calculated, wherein the load center distance index represents the distance between all power supply equivalent access points and the equivalent load center of the distribution network, and the electricity structure index represents the influence of all power supply electricity on the load of the distribution network; According to the load center distance index and the power structure index, a line loss allocation correction coefficient of all power supply nodes under the target traditional power supply in the distribution network is obtained; Allocate line losses to each power supply node in the distribution network according to the line loss allocation correction coefficient; According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the load center distance index of all power supply nodes under the target traditional power supply is calculated, including: According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, determine the first active electricity of each distribution transformer under the target traditional power source and the second active electricity of each power node in each time period, the first line segment length of each distribution line segment from the distribution network head end corresponding to the target traditional power source to each distribution transformer in the distribution network in each time period, and the second line segment length of each distribution line segment from the distribution network head end to each power node in each time period; Calculate the distribution network equivalent load center distance and all power access point equivalent distances corresponding to each time period according to the first active power, the second active power, the first line segment length, and the second line segment length corresponding to each time period; Calculate the first load center distance index corresponding to each time period according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points; Calculate the average value of all first load center distance indexes that are not zero to obtain the load center distance indexes of all power supply nodes under the target traditional power supply; According to the topological structure of the distribution network and the time-divided electricity structure distribution diagram, the electricity structure index of all power supply nodes under the target traditional power supply is calculated, including: Calculating the power penetration index and the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period; The product of the power penetration index and the power distribution width index is calculated to obtain the power structure index of all power supply nodes under the target traditional power supply.

2. The method for allocating line losses in a power distribution network according to claim 1, characterized in that: The calculating, according to the first active power, the second active power, the first line segment length and the second line segment length corresponding to each time period, the distribution network equivalent load center distance and the equivalent distances of all power access points corresponding to each time period comprises: according to Calculate the distribution network equivalent load center distance corresponding to the qth period; according to Calculate the equivalent distances of all power access points corresponding to the qth time period; Among them, L cq represents the equivalent load center distance of the distribution network corresponding to the qth period, W j represents the first active power of the jth distribution transformer under the target traditional power source, L d represents the length of the first line segment of the dth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the jth distribution transformer, j = 1, 2, ..., m, m represents the total number of distribution transformers under the target traditional power source, d = 1, 2, ..., m j , m j represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the jth distribution transformer; L psq represents the equivalent distance of all power access points corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, L k represents the second line segment length of the kth distribution line segment in the distribution network from the distribution network head end corresponding to the target traditional power source to the i-th power source node, i = 1, 2, ..., n, n represents the total number of all power source nodes under the target traditional power source, k = 1, 2, ..., n i , n i Represents the total number of distribution line segments from the head end of the distribution network corresponding to the target traditional power source to the i-th power source node.

3. The method for allocating line losses in a power distribution network according to claim 2, characterized in that: The step of calculating the first load center distance index corresponding to each time period according to the distribution network equivalent load center distance corresponding to each time period and the equivalent distances of all power access points includes: According to L Wq =|L cq -L psq | / L cq , calculate the first load center distance index corresponding to the qth period; Among them, L Wq Represents the first load center distance index corresponding to the qth time period.

4. The method for allocating line losses in a power distribution network according to claim 1, characterized in that: Calculating the power penetration index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period, including: according to Calculating the power penetration index of all power supply nodes under the target traditional power supply; Among them, H a represents the power penetration index of all power nodes under the target traditional power supply, H q represents the power penetration index corresponding to the qth period, W psi represents the second active power of the i-th power node under the target traditional power source, W j represents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

5. The method for allocating line losses in a power distribution network according to claim 1, characterized in that: Calculating the power distribution width index of all power supply nodes under the target traditional power supply according to all the first active power and all the second active power corresponding to each time period, including: according to Calculating the power distribution width index of all power supply nodes under the target traditional power supply; Among them, W a It represents the power distribution width index of all power nodes under the target traditional power supply, W psi represents the second active power of the i-th power node under the target traditional power source, W j represents the first active power of the jth distribution transformer under the target traditional power source, i=1,2,…,n, n represents the total number of all power supply nodes under the target traditional power source, j=1,2,…,m, m represents the total number of distribution transformers under the target traditional power source, q=1,2,…,Q, Q represents the total number of all time periods divided by the distribution network.

6. The method for allocating line losses in a distribution network according to any one of claims 1 to 3, characterized in that: The allocating line losses to each power supply node in the distribution network according to the line loss allocation correction coefficient includes: Calculate the first shared network loss of all power supply nodes under the target traditional power supply in the distribution network according to the line loss sharing correction coefficient and the total shared network loss of all time periods of the distribution network; Allocate the first shared network loss according to the power generation power of each power node under the target traditional power source, and determine the shared line loss of each power node under the target traditional power source; The shared line loss of the target traditional power source is determined according to the total shared network loss and the first shared network loss.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images