Distribution network system network loss allocation method and system of distributed power supply

Abstract

The invention discloses a network loss allocation method and system for a distribution network system of a distributed power supply, and belongs to the technical field of data processing. Performing equivalent division by taking the segmented region as a main body; enabling the total generator power and the total load power of each equivalent area to be equivalent to a generator and a load, determining a power flow path of each segmented area, and obtaining the loss borne by a lead on the power flow path of each segmented area and the loss ratio; using an average network loss coefficient method in which participants including a power supply main body, a load main body and an energy storage main body are considered; calculating the respective line loss coefficients of the participants to obtain the line loss borne by each type of participants, allocating the loss in the segmented region to each equivalent region, and determining the allocated loss and proportion of each equivalent region; and summarizing the shared loss and proportion of each equivalent area, and outputting a distribution line or transformer area network loss allocation result. According to the method, the calculation precision of network loss allocation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and more specifically to a method and system for allocating network losses of a distributed power distribution system. Background Art

[0002] After the distributed generation (DG) is connected to the distribution network, the power flow direction and network loss of the distribution network have changed. The degree of influence of the distribution network loss is affected by many factors such as the grid-connected capacity, grid-connected location, grid-connected penetration rate and grid-connected operation mode of the distributed generation. At present, the distributed generation participates in the power flow and transmission of the distribution network, but does not bear the corresponding proportion of network loss, which makes the power supplier and the user bear the excess network loss, and also makes the distributed generation unable to share the economic benefits brought by its grid connection, and it cannot provide a good reference direction for the economic planning and operation of the distribution network.

[0003] Therefore, it is of great significance to study the allocation of network losses caused by the grid connection of distributed generation. However, there is still a lack of accurate measurement methods to evaluate the contribution of distributed generation to distribution network losses.

[0004] In recent years, there have been many achievements in the study of the network loss allocation problem of distribution networks containing distributed generation, including: the marginal network loss coefficient method, which takes into account the network flow and calculates the network loss allocation of each node according to the change in the network loss of the whole network caused by the power change of each load or generator node. This allocation method can reflect the marginal network loss cost caused by each node to the network and can provide certain economic signals, but this method is only applicable to networks with a small impedance ratio (R / X), and the allocation result may be unbalanced. The proportional allocation method allocates network losses to each load or generator according to a certain proportion according to the power level of the load or generator. The calculation is simple, but since this method does not consider the network structure, line distance and node location, the allocation result cannot provide a correct economic signal. The branch current decomposition method based on circuit theory calculates the network loss allocation of each node according to the branch current connected to each node and the root node, establishes a connection between the branch network loss and the node current, and can accurately calculate the network loss allocation of the traditional distribution network.

[0005] However, for distribution networks containing distributed generation, since this method distributes the network loss changes to the load and each distributed generation at the same time, it will cause cross-subsidy in space and time, which will lead to unfair sharing results. Summary of the invention

[0006] In response to the problems existing in the above-mentioned fields, the present invention proposes a network loss allocation method and system for a distribution network system of distributed power sources, which arbitrarily divides the distribution lines or substations into several divided areas, and divides the divided areas as the main body for equivalent division to obtain multiple equivalent areas, and the total generator power and the total load power of each equivalent area are equivalent to one generator and one load, and the loss and loss proportion borne by the wires on the flow path of each divided area are determined. On this basis, the loss in each divided area is allocated to each equivalent area, and the loss and proportion allocated to each equivalent area are determined, and network loss allocation calculations are performed on a larger range, so as to achieve the purpose of improving the calculation speed and calculation accuracy, thereby improving the equipment utilization rate of the power grid.

[0007] In order to solve the above technical problems, the present invention discloses a method for allocating network losses of a distribution network system of a distributed power source, comprising the following steps:

[0008] According to the obtained topological graph and operation data of the wiring or substation area, the wiring or substation area is arbitrarily divided into several segmented areas;

[0009] Taking the segmented area as the main body for equivalent division, a plurality of equivalent areas are obtained;

[0010] The total generator power and total load power of each equivalent area are equivalent to one generator and one load. The power flow source nodes of each segmented area are tracked by the power flow tracking method to determine the power flow path of each segmented area, and the loss and loss ratio borne by the conductor on the power flow path of each segmented area are obtained;

[0011] According to the losses and loss proportions borne by the conductors on the power flow paths of each segmented area, the average network loss coefficient method is used, which takes into account the participating entities including the power source entity, the load entity and the energy storage entity; the line loss borne by each type of participating entity is obtained by calculating the line loss coefficients of each participating entity; according to the line loss borne by each type of participating entity, the loss is apportioned according to the proportion of power supply and consumption, and the loss in the segmented area is apportioned to each equivalent area, and the loss and proportion apportioned to each equivalent area are determined;

[0012] The losses and proportions allocated to each equivalent area are summarized, and the distribution line or substation network loss allocation results are output.

[0013] Preferably, the arbitrarily dividing the wiring or station area into a plurality of divided areas specifically includes:

[0014] Obtain topological graphics and operation data of wiring or substations;

[0015] Input the data required for calculation, calculate the wiring and substation flow, and arbitrarily divide the wiring and substation flow into several divided areas in the flow calculation graph.

[0016] Preferably, determining the flow path of each segmented area specifically includes:

[0017] Obtain the topological diagram of the distribution line or substation, as well as the power flow calculation and network loss allocation calculation result data;

[0018] According to the obtained topological diagram of the distribution line or substation and the power flow calculation and network loss sharing calculation result data, the power flow path of the sharing entity is tracked by the power flow tracking method to obtain the complete power flow path of each sharing entity from the power node to the load node.

[0019] Preferably, the obtaining of the loss and loss ratio borne by the conductor on the power flow path of each segmented area specifically includes:

[0020] Based on the complete power flow path from the power node to the load node of each apportionment entity, the loss and proportion borne by each conductor, power source, and load on the power flow path of each divided area are quantified through line loss tracing analysis and calculation method;

[0021] According to the results of power flow calculation and allocation, a segmentation area is selected and the power flow path of the segmentation area is traced;

[0022] Calculate the power contribution of each conductor segment on the power flow path to the divided area;

[0023] According to the power contribution, calculate the loss and proportion of each power source and conductor segment on the power flow path;

[0024] When traversing all the segmented areas, the loss and loss ratio borne by the conductor on the power flow path of each segmented area are output.

[0025] Preferably, obtaining the line loss borne by each type of participating entity specifically includes:

[0026] The participants of the improved average network loss coefficient method include power source, load and energy storage.

[0027] According to the distribution coefficients of the power source, load and energy storage, the electricity consumption is apportioned according to the proportion of power supply and consumption, where:

[0028] The line loss coefficient calculation formula of the power supply body is:

[0029]

[0030] The calculation formula of the line loss coefficient of the load body is:

[0031]

[0032] For the energy storage entity, when the system power supply is greater than the load power consumption, the energy storage entity stores the excess power; when the system power supply is less than the load power consumption, the energy storage system outputs power to the system, and the energy storage system does not share the network loss when it is not in operation;

[0033] The operation modes of the energy storage subject include three situations: power supply operation, load operation and non-operation;

[0034] When the energy storage entity is used as a power source, it is used as a power source to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the power source entity is:

[0035]

[0036] When the energy storage system operates as a load, it is used as a load to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the load entity is:

[0037]

[0038] According to the line loss coefficient of the participating entity, the line loss L borne by a certain type of participating entity is calculated. j for:

[0039] L j =λP j

[0040] Where n represents the total number of power nodes; m represents the total number of load nodes; j represents the node number of the participating entity; P i represents the power of power node i; P k represents the power load of load k; P Gi represents the injected power of power source G at node i; P DESt represents the active power of energy storage participating node t; P LK Represents the node load demand vector P L The kth component of j represents the active power of the participating node j; P loss The total network line loss.

[0041] Preferably, the method further includes summarizing and outputting the line loss tracing results of each segmented area according to the losses and loss proportions borne by the conductors on the power flow paths of each segmented area obtained.

[0042] Preferably, the output distribution line or substation network loss allocation result and the output line loss tracing result specifically include:

[0043] Obtain network loss allocation report and line loss tracing report. Use network loss allocation report to check network loss allocation results of distribution lines or substations on power flow calculation graph. Use line loss tracing report to check line loss tracing results of each segmented area on power flow calculation graph.

[0044] Preferably, the network loss allocation report includes a distribution network loss allocation hourly report and a substation network loss allocation hourly report; the distribution network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the distribution line, including the allocated loss and allocation ratio result data of each equivalent area; the substation network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the substation, including the allocated loss and allocation ratio result data of each equivalent area.

[0045] Preferably, the line loss tracing report includes a distribution line loss tracing hourly report and a substation line loss tracing hourly report; the distribution line loss tracing hourly report is used to query the flow tracing hourly calculation results of each segmented area at each moment within a certain time period of the distribution line, including the loss borne by the conductor segment on the flow path and the loss proportion result data; the substation line loss tracing hourly report is used to query the flow tracing hourly calculation results of each segmented area at each moment within a certain time period of the substation, including the loss borne by the conductor segment on the flow path and the loss proportion result data.

[0046] Preferably, a network loss sharing system of a distributed power distribution system is also included, comprising:

[0047] The area division module is used to arbitrarily divide the wiring or substation area into several divided areas according to the obtained topological graph and operation data of the wiring or substation area; the divided area is used as the main body for equivalent division to obtain multiple equivalent areas;

[0048] The loss allocation module of each segmented area is used to determine the tie line power and loss by allocating the tie line loss between the segmented areas to the equivalent generators and equivalent loads in each segmented area; according to the tie line power and loss, the loss of each segmented area is allocated to each generator and load to obtain the allocated tie line loss of each segmented area; according to the regional allocation of tie line loss, the network loss allocation ratio of the regional tie line between the regional entities is determined;

[0049] Each equivalent area loss allocation module is used to track the flow source node of each allocation subject, determine the flow path of each allocation subject, and obtain the loss and loss proportion borne by the wire on the flow path of each allocation subject;

[0050] The allocation result output module is used to summarize the losses and proportions allocated to each equivalent area and output the distribution line or substation network loss allocation results.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The network loss apportionment method of the distributed power distribution system proposed in the present invention is to arbitrarily divide the distribution line or substation into several divided areas; and divide the divided areas as the main body to obtain multiple equivalent areas; the total generator power and the total load power of each equivalent area are equivalent to one generator and one load, and the flow source node of each divided area is tracked by the flow tracking method to determine the flow path of each divided area, and the loss and loss proportion borne by the wire on the flow path of each divided area are obtained, and on this basis, a larger range of network loss apportionment calculations are performed, so as to achieve the purpose of improving the calculation speed and calculation accuracy. By tracking the flow source nodes of each divided area, the loss and loss proportion borne by the wire on the flow path of each apportionment subject are obtained, so as to trace the line loss source line borne by the line loss bearing subject, so as to achieve the purpose of quantifying the line loss responsibility ratio borne by the power supply and user in the power grid and clarifying the source of loss in the network, and improving the efficiency of line loss management. Based on the obtained network loss sharing ratio of regional interconnection lines between equivalent areas and the losses and loss proportions borne by the conductors on the flow paths of each sharing entity, the losses in the divided areas are shared among the equivalent areas. This can save a lot of manpower, material resources and other resources in the loss reduction work and improve the efficiency of line loss management. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a flow chart of the network loss allocation method of the distributed power distribution system of the present invention;

[0054] Figure 2 A flow chart of repairing basic data of a distribution network provided by an embodiment of the present invention;

[0055] Figure 3 The basic data repair of the power distribution line provided by the embodiment of the present invention;

[0056] Figure 4 A flow chart of repairing distribution network operation data provided by an embodiment of the present invention;

[0057] Figure 5 A distribution line operation data repair page provided by an embodiment of the present invention;

[0058] Figure 6 A flow chart for comparative analysis of theoretical line loss "three rates" improvement provided by an embodiment of the present invention;

[0059] Figure 7 A flow chart of network loss allocation calculation provided by an embodiment of the present invention;

[0060] Figure 8 A flow chart of network loss tracing calculation provided by an embodiment of the present invention;

[0061] Fig. 9 The network loss allocation calculation process provided by the embodiment of the present invention;

[0062] Fig.10 The network loss allocation calculation setting provided by the embodiment of the present invention;

[0063] Fig.11 The traceability analysis calculation process provided by the embodiment of the present invention;

[0064] Fig.12 The traceability analysis calculation settings provided by the embodiment of the present invention;

[0065] Fig.13 A distribution network loss allocation hourly report page provided in an embodiment of the present invention;

[0066] Fig.14 A wiring line loss tracing report page provided in an embodiment of the present invention;

[0067] Fig.15 A comparison page of theoretical line losses of wiring in the same period provided by an embodiment of the present invention;

[0068] Fig.16 The line loss allocation and positioning idea provided by the embodiment of the present invention;

[0069] Fig.17 A flow chart of building a knowledge base provided by an embodiment of the present invention;

[0070] Fig.18 A flow chart of an automatic reasoning machine provided by an embodiment of the present invention;

[0071] Fig.19 A distribution line loss reduction auxiliary decision page provided in an embodiment of the present invention;

[0072] Fig. 20 A low voltage area loss reduction auxiliary decision page is provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0073] The following will be combined with the attached embodiment of the present invention Figure 1-Figure 20 , the technical solutions in the embodiments of the present invention are clearly and completely described. It should be understood that the terms described in the present invention are only used to describe specific implementation methods and are not used to limit the present invention.

[0074] like Figure 1 As shown, the present invention proposes a method for allocating network losses of a distributed power distribution system, comprising the following steps:

[0075] S1: According to the obtained topological graph and operation data of the wiring or substation, the wiring or substation is arbitrarily divided into several segmented areas;

[0076] S2: taking the segmented region as the main body for equivalent division to obtain multiple equivalent regions;

[0077] S3: The total generator power and the total load power of each equivalent area are equivalent to one generator and one load, and the flow source nodes of each segmented area are tracked by the flow tracking method to determine the flow path of each segmented area, and the loss and loss proportion borne by the conductor on the flow path of each segmented area are obtained;

[0078] S4: Based on the losses and loss proportions of the conductors on the power flow paths of each segmented area, the average network loss coefficient method is used, which takes into account the participating entities including the power source entity, the load entity and the energy storage entity; the line loss borne by each type of participating entity is obtained by calculating the line loss coefficients of each participating entity; based on the line loss borne by each type of participating entity, the losses in the segmented area are apportioned to each equivalent area according to the proportion of power supply and consumption, and the losses and proportions apportioned to each equivalent area are determined;

[0079] S5: Summarize the losses and proportions allocated to each equivalent area, and output the distribution line or substation network loss allocation results.

[0080] Specifically, the topological graph and operation data of the wiring or substation area are repaired, including:

[0081] Obtain basic data and operating data of the distribution network, and identify abnormal data in the basic data and operating data through preset rules;

[0082] Locate and identify the network distribution equipment with missing parameters based on abnormal data;

[0083] The basic parameters of the device connected to the network configuration device with the missing parameters are obtained, and the basic parameters are assigned to the device with the missing parameters to complete the parameters of the network configuration device with the missing parameters.

[0084] In step S1, the wiring or station area is arbitrarily divided into several segmented areas, specifically including:

[0085] Obtain topological graphics and operation data of wiring or substations;

[0086] Input the data required for calculation, calculate the wiring and substation flow, and arbitrarily divide the wiring and substation flow into several divided areas in the flow calculation graph.

[0087] In step S3, the flow path of each segmented area is determined, which specifically includes:

[0088] Obtain the topological diagram of the distribution line or substation, as well as the power flow calculation and network loss allocation calculation result data;

[0089] According to the obtained topological diagram of the distribution line or substation and the power flow calculation and network loss sharing calculation result data, the power flow path of the sharing entity is tracked by the power flow tracking method to obtain the complete power flow path of each sharing entity from the power node to the load node.

[0090] Obtain the loss and loss ratio of the conductor on the power flow path of each segmented area, including:

[0091] Based on the complete power flow path from the power node to the load node of each apportionment entity, the loss and proportion borne by each conductor, power source, and load on the power flow path of each divided area are quantified through line loss tracing analysis and calculation method;

[0092] According to the results of power flow calculation and allocation, a segmentation area is selected and the power flow path of the segmentation area is traced;

[0093] Calculate the power contribution of each conductor segment on the power flow path to the divided area;

[0094] According to the power contribution, calculate the loss and proportion of each power source and conductor segment on the power flow path;

[0095] When traversing all the segmented areas, the loss and loss ratio borne by the conductor on the power flow path of each segmented area are output.

[0096] In step S4, the line loss borne by each type of participating entity is obtained, including:

[0097] The participants of the improved average network loss coefficient method include power source, load and energy storage.

[0098] According to the distribution coefficients of the power source, load and energy storage, the electricity consumption is apportioned according to the proportion of power supply and consumption, where:

[0099] The line loss coefficient calculation formula of the power supply body is:

[0100]

[0101] The calculation formula of the line loss coefficient of the load body is:

[0102]

[0103] For the energy storage entity, when the system power supply is greater than the load power consumption, the energy storage entity stores the excess power; when the system power supply is less than the load power consumption, the energy storage system outputs power to the system, and the energy storage system does not share the network loss when it is not in operation;

[0104] The operation modes of the energy storage subject include three situations: power supply operation, load operation and non-operation;

[0105] When the energy storage entity is used as a power source, it is used as a power source to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the power source entity is:

[0106]

[0107] When the energy storage system operates as a load, it is used as a load to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the load entity is:

[0108]

[0109] According to the line loss coefficient of the participating entity, the line loss L borne by a certain type of participating entity is calculated. j for:

[0110] L j =λP j

[0111] Where n represents the total number of power nodes; m represents the total number of load nodes; j represents the node number of the participating entity; P i represents the power of power node i; P k represents the power load of load k; P Gi represents the injected power of power source G at node i; P DESt represents the active power of energy storage participating node t; P LK Represents the node load demand vector P L The kth component of j represents the active power of the participating node j; P loss The total network line loss.

[0112] In step S5, based on the acquired losses and loss proportions borne by the conductors on the power flow paths of the divided areas, the line loss tracing results of the divided areas are summarized and output.

[0113] The output distribution line or substation network loss allocation results and output line loss tracing results include:

[0114] Obtain network loss allocation report and line loss tracing report. Use network loss allocation report to check network loss allocation results of distribution lines or substations on power flow calculation graph. Use line loss tracing report to check line loss tracing results of each segmented area on power flow calculation graph.

[0115] The network loss allocation report includes the distribution network loss allocation hourly report and the substation network loss allocation hourly report; the distribution network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the distribution line, including the allocated loss and allocation ratio result data of each equivalent area; the substation network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the substation, including the allocated loss and allocation ratio result data of each equivalent area.

[0116] The line loss tracing report includes the distribution line loss tracing report at the whole time point and the substation line loss tracing report at the whole time point. The distribution line loss tracing report at the whole time point is used to query the flow tracing calculation results of each segmented area at each moment within a certain time period of the distribution line, including the loss borne by the conductor segment on the flow path in each segmented area and the loss proportion result data; the substation line loss tracing report at the whole time point is used to query the flow tracing calculation results of each segmented area at each moment within a certain time period of the substation, including the loss borne by the conductor segment on the flow path in each segmented area and the loss proportion result data.

[0117] The present invention also proposes a network loss sharing system for a distributed power distribution system, comprising:

[0118] The area division module is used to arbitrarily divide the wiring or substation area into several divided areas according to the obtained topological graph and operation data of the wiring or substation area; the divided area is used as the main body for equivalent division to obtain multiple equivalent areas;

[0119] The loss allocation module of each segmented area is used to determine the tie line power and loss by allocating the tie line loss between the segmented areas to the equivalent generators and equivalent loads in each segmented area; according to the tie line power and loss, the loss of each segmented area is allocated to each generator and load to obtain the allocated tie line loss of each segmented area; according to the regional allocation of tie line loss, the network loss allocation ratio of the regional tie line between the regional entities is determined;

[0120] Each equivalent area loss allocation module is used to track the flow source node of each allocation subject, determine the flow path of each allocation subject, and obtain the loss and loss proportion borne by the wire on the flow path of each allocation subject;

[0121] The allocation result output module is used to summarize the losses and proportions allocated to each equivalent area and output the distribution line or substation network loss allocation results.

[0122] The method proposed by the present invention can improve the calculation accuracy of network loss allocation, thereby improving the utilization rate of power grid equipment.

[0123] Example

[0124] In order to verify the effectiveness of the method proposed in the present invention, the present invention improves the demonstration application of a key technology for systematic loss reduction of a distribution network containing a high proportion of distributed power sources.

[0125] Step 1: Data acquisition and data repair

[0126] Step 1.1: Repair basic network data

[0127] The diagnosis and repair of basic data of the distribution network can diagnose the quality of basic data through business rules, and repair the diagnosed abnormal data according to certain rules and logic to ensure the accuracy, consistency and integrity of the data. The data comes from multiple source business systems and is stored in the data warehouse of this system through the data interface. Quality inspection and deep mining of abnormal data are carried out on the data warehouse. For basic data, the main checks are the uniqueness of the data, whether the attribute data is missing, and whether the association relationship is correct.

[0128] The specific repair process of the basic data of the distribution network in this embodiment is as follows: Figure 2 As shown, the distribution network system obtains all the distribution network devices with missing parameters through certain rules, including distribution transformers, wires, etc. According to the device with missing parameters, the basic parameters of the devices connected to the device are obtained, and these basic parameters are assigned to the device with missing parameters to complete its parameters. The system processing method is briefly described as follows:

[0129] Basic data quality diagnosis

[0130] Query missing basic equipment information (including affiliated units, equipment types, equipment parameters, etc.)

[0131] Basic data repair

[0132] For missing or incomplete basic equipment data, the system's built-in abnormal data verification and repair mechanism can be used to complete the missing equipment parameter repair with one click. The system obtains all the distribution network equipment with missing parameters through certain rules, including distribution transformers, wires, etc. According to the equipment with missing parameters, the basic parameters of the equipment connected to the equipment are obtained, and these basic parameters are assigned to the equipment with missing parameters to complete its parameters. The system repair rules are briefly described as follows:

[0133] (1) Missing distribution transformer model and capacity

[0134] The system can obtain daily electricity data for multiple days in the history of the distribution transformer with missing parameters and calculate its average value. Then, based on the economic load rate of 60%, it can calculate its economic capacity and match the model library capacity to repair the basic parameters of the distribution transformer model and capacity.

[0135] (2) Wiring segment parameters are missing

[0136] like Figure 3 As shown in the figure, for electrical components such as wiring segments with missing parameters, the system can repair them from two aspects: missing model and missing length:

[0137] 1) Missing wire diameter: The missing wire can be repaired based on the wire diameters of the two wires before and after the missing wire (if the wire diameters are inconsistent, use the wire diameter closer to the head end to repair it).

[0138] 2) Missing length: Calculate the length based on the coordinate point information. If there is no coordinate point information, repair it based on the length of the previous wire.

[0139] Step 1.2: Repair the network operation data

[0140] In the acquired multi-source system data, there may be relatively hidden and difficult-to-find abnormal data. According to the built-in abnormal data verification and repair rules of the system, secondary verification can be performed to identify the hidden abnormal data and automatically repair it to further improve the data accuracy. The specific operation data repair process is as follows: Figure 4 shown.

[0141] Obtain and analyze distribution network topology and operation data

[0142] The first step in repairing the distribution network operation data is to obtain the distribution network topology data. Through intelligent topology model analysis plug-ins, computer graphics related intelligent algorithms, automatic connection and automatic layout algorithms, etc., the basic model topology data of the corresponding lines is extracted and analyzed to obtain the internal connection relationship data of the power grid model. The line connection coordinate data of the GIS system is used to determine the connection relationship and length of each trunk line and branch line, thereby completing the automatic drawing of the topology graph. After the drawing is completed, the multi-source data is integrated and connected through operations such as loading, assembling, cleaning, and associating multi-source system data, and finally the distribution network operation data is matched to the equipment in the topology graph.

[0143] Distribution network operation data quality diagnosis and identification

[0144] The diagnosis of distribution network operation data is mainly aimed at two types of abnormal data, namely distorted data and missing data. The two types of abnormal data have different abnormal characteristics and corresponding detection methods are also different. The specific detection methods are as follows:

[0145] (1) Run data distortion detection

[0146] By setting trend analysis (linear / logarithmic / exponential / power / polynomial), sample type (year-on-year / month-on-month), sample period (historical data range), normal range (upper limit / lower limit) and other methods for the operating data, the data exceeding the normal range is detected and judged as distorted data based on the difference between the analysis and prediction results and the actual results.

[0147] (2) Run data missing detection

[0148] Check whether the value of the running data is empty, filter out the running data with empty values, and determine that there is no missing data.

[0149] Step 1.3: Repair the network operation data

[0150] The distribution network operation data repair needs to be combined with the topology graph to find and locate the abnormal data nodes through the system's built-in algorithms and rules. The segmented abnormal data repair area is continuously adjusted according to whether the abnormal node data can be corrected by the adjacent nodes until the condition that there are adjacent normal nodes in the segmented area to repair the abnormal nodes is met. Finally, according to different abnormal data situations, the system's built-in linear regression algorithm, Lagrange interpolation algorithm, etc. are used to repair the abnormal and missing operation data, such as Figure 5 shown.

[0151] Step 1.4: Improvement of the “three rates” of theoretical line loss

[0152] The improvement of the "three rates" of theoretical line loss refers to the improvement of the data accuracy, fault tolerance and synchronization rate of the theoretical line loss calculation system with the same period line loss system before and after abnormal data diagnosis and repair.

[0153] Theoretical line loss "three rates" improvement comparative analysis process is as follows Figure 6 As shown, first, it is necessary to obtain and parse the basic data and operation data of the distribution network. Secondly, the 96-point theoretical line loss is initially calculated before the abnormal data is repaired and the result data is saved. Then, the abnormal data is diagnosed and repaired as needed to improve the data quality of the basic data and operation data. Thirdly, the 96-point theoretical line loss is calculated after the abnormal data is repaired. Finally, the improvement degree of the three rates before and after the abnormal data repair is compared and analyzed.

[0154] The calculation method of the “three rates” is as follows:

[0155] Accuracy = (normal data volume / total data volume) * 100%

[0156] Note: The data range includes all ledger data and operation data, but does not include topology data.

[0157] Simultaneity rate = (number of distribution lines with theoretical line loss calculation results / number of distribution lines with simultaneous results) * 100%

[0158] Note: (1) The number of synchronous results can be obtained from the synchronous system (daily results); (2) The number of distribution lines for theoretical line loss calculation results is obtained by summarizing the theoretical line loss calculation results within one day (24 points or 96 points) and counting how many distribution lines have calculation results; (3) The number of distribution lines is based on the synchronous system, and the distribution lines that are not in the synchronous system are not counted.

[0159] Fault tolerance rate = ((amount of data allowed to be abnormal + amount of abnormal data that has been repaired) / total amount of abnormal data involved in the calculation) * 100%

[0160] Note: The prerequisite for the formula to be applicable is the account data and operation data involved in the theoretical line loss calculation, including: minute operation data such as power, voltage, and current of wiring and distribution transformers, model and length of wiring segments, and model of distribution transformers.

[0161] Step 2: Calculation method for network loss allocation

[0162] The design concept of network loss allocation calculation based on arbitrary segmentation is: arbitrarily segment the area in the power flow calculation graph, use the power flow tracking method to allocate the tie line loss between the segmented areas to the equivalent generators and equivalent loads in each segmented area; use the improved average network loss coefficient method to allocate the loss of the segmented area and the loss of the regional apportioned tie line to each generator and load; on this basis, perform network loss allocation calculation in a larger range, so as to achieve the purpose of improving the calculation speed and calculation accuracy. The calculation process of network loss allocation is as follows: Figure 7 shown.

[0163] Step 3: Calculation method for network loss allocation

[0164] Line loss tracing is mainly to improve the power flow tracing method to trace the line loss source line of the subject responsible for the line loss, so as to achieve the purpose of quantifying the proportion of line loss responsibility borne by the power supply and user in the power grid and clarifying the source of loss in the network. Figure 8 shown.

[0165] In step 2, the specific network loss allocation calculation function includes: automatically obtaining the basic model data, operation data and topology data of the power grid, manually dividing the power grid topology arbitrarily, and using the network loss allocation algorithm to calculate the network loss allocation of each power grid entity and output the results. This function can realize network loss calculation including distribution network and low-voltage substation, and automatically generate network loss allocation hourly result report, which helps line loss management personnel clarify loss responsibility issues, save a lot of manpower and material resources in loss reduction work, and improve the efficiency of line loss management.

[0166] like Fig. 9As shown in the figure, first, it is necessary to obtain the topological diagram of the distribution line or substation and the operating data such as power and current; secondly, the distribution line or substation is arbitrarily divided into several areas on the topological diagram manually; thirdly, the network loss is apportioned based on the split area, and the split area is used as the main body for equivalent division, and the total generator power and the total load power of each equivalent area are equivalent to one generator and one load, and the network loss apportionment ratio between the main bodies of each area on the regional tie line is determined by the power flow tracking method; then, the loss in the split area is apportioned to each independent individual using the improved average network loss coefficient method, and the loss and proportion of each main body in each sub-area are clarified; finally, the loss results of each main body in each split area are summarized and the network loss apportionment results of the distribution line or substation are output, and the apportionment results of each main body can be viewed on the topological diagram, as shown in the figure. Fig.10 The figure shows a schematic diagram of network loss allocation calculation settings.

[0167] In step 3, the specific line loss tracing calculation function includes: automatically obtaining the power grid's flow calculation data and topology data, using the line loss tracing algorithm to track the flow source nodes of each power grid's apportionment entity, and calculating the loss and loss proportion borne by the conductor on the flow path, and automatically outputting the calculation results. This function can realize line loss tracing calculations including distribution networks and low-voltage substations, and automatically generate tracing analysis results reports at the entire point, helping line loss management personnel to clarify the source of losses and improve the efficiency of line loss management.

[0168] like Fig.11 As shown in the figure, first, it is necessary to obtain the topological diagram of the distribution line or substation and the power flow calculation and network loss allocation calculation result data; secondly, use the power flow tracking method to track the power flow path of the allocation subject and obtain the complete power flow path from the power node to the load node; then, use the line loss tracing analysis calculation method to quantify the losses and proportions borne by each conductor, power source, and load on the power flow path, and clarify the losses borne by each device; finally, summarize the tracing calculation results of each allocation subject and output the distribution line or substation network loss tracing results, and view the tracing power flow path calculation results of each allocation subject on the topological diagram, as shown in the figure. Fig.12 The figure shows the schematic diagram of the line loss tracing analysis and calculation settings.

[0169] Step 4: Output of network loss allocation and tracing results

[0170] The output of network loss allocation results is network loss allocation report, which is divided into distribution network loss allocation hourly report and substation network loss allocation hourly report, among which:

[0171] like Fig.13As shown, the distribution network loss allocation hourly report can query the calculation results of the allocation entities (transformers, distributed power sources, energy storage devices) of the distribution line at each hour within a certain time period, including the allocation loss and allocation ratio result data of each allocation entity, and the query results can also be exported.

[0172] The hourly report on network loss allocation in the substation area can query the calculation results of the allocation entities (users, distributed power sources, energy storage devices) at each hour in a certain time period in the substation area, including the allocation loss and allocation ratio result data of each allocation entity, and the query results can also be exported.

[0173] The output of the traceability result is a line loss traceability report, which is divided into a distribution line loss traceability report and an area line loss traceability report.

[0174] like Fig.14 As shown, the distribution line loss tracing report can query the flow tracing calculation results of the apportioned entities (transformers, distributed power sources, energy storage devices) at each moment in a certain time period of the distribution line, including the loss of the shared entity and the loss proportion borne by the conductor segment on the flow path. The query results can also be exported.

[0175] The substation line loss tracing hourly report can query the calculation results of the power flow tracing hourly at each moment of the apportioned entities (transformers, distributed power sources, energy storage devices) within a certain time period in the substation, including the loss of the apportioned entities borne by the conductor segments on the power flow path and the loss proportion results. The query results can also be exported.

[0176] In addition, this embodiment also proposes a multi-subject access distribution network integrated line loss tracing full-process closed-loop control module architecture, which specifically includes:

[0177] S1: High loss monitoring in the same period

[0178] Obtain the data of distribution network equipment and line loss in the same period, monitor the power supply, line loss, line loss rate and other data of the distribution lines in the same period, set the high-loss judgment rules consistent with the system in the same period to screen out the high-loss lines, and prepare for the subsequent targeted management of high-loss lines in the distribution network.

[0179] Synchronous distribution network equipment information export

[0180] Export distribution network equipment information from the synchronous system, including distribution lines, distribution transformers, substations, substation users, distributed power sources, etc. The exported data format is an Excel file, including equipment number, component name, substation, voltage level, equipment type, and the set data table is shown in Table 1.

[0181] Table 1 Synchronous system export equipment type table

[0182]

[0183]

[0184] Equipment metering point information export

[0185] The equipment metering point information is exported in Excel file format, including metering point name, metering point number, source system, PT, CT, multiplier, equipment type, etc. The detailed data of daily electricity consumption of the metering point is also exported in Excel file format, including metering point number, date, forward electricity consumption, and reverse electricity consumption, as shown in Table 2.

[0186] Table 2 Synchronous system export equipment metering point information table

[0187] Data Item illustrate Remark Measurement point code (sid) Coding of equipment metering point Usually consistent with the device code Measuring point name (name) Measuring point name PT PT of metering point CT CT at the measuring point Device type (psr_type_code) Equipment type of the metering point

[0188] Export of synchronous line loss data

[0189] Finally, the line loss data such as distribution line loss and substation loss are exported. After the data is exported, the data is imported into the system through the system upload function, and the data of the system in the same period is parsed and stored in the database through the developed Excel data file parsing plug-in. The line loss data in the same period includes input power, output power, power sales, loss power, line loss rate, etc., as shown in Table 3.

[0190] Table 3 Synchronous system export information table

[0191] Data Item illustrate Remark Input power Substation power supply Output power Small power supply reverses power Electricity Sales Transformer power consumption Loss of power Power consumption Power input - Power output - Power sales Line loss rate Line loss rate Power loss / power supply

[0192] S2: Line loss warning analysis

[0193] In order to overcome the problem that abnormalities in the same period of line loss cannot be quickly checked and to improve the work efficiency of abnormal analysis of the same period of line loss, a comparative analysis function of the same period of line loss and theoretical line loss has been developed. While ensuring the correctness of the theoretical line loss calculation results, the theoretical line loss results, the model configuration relationship of the theoretical line loss, and the gateway metering point data are used as reference benchmarks to compare and analyze the differences with the line loss of the same period of time, so as to quickly verify the abnormalities of the line loss of the same period of time.

[0194] The system has the function of analyzing the difference between synchronous and theoretical line losses, and its implementation ideas are as follows:

[0195] In the early stage, the gateway model configuration, operation data, calculation results and other data information of the line loss in the same period are obtained. It is necessary to compare and analyze the differences between the line loss in the same period and the theoretical line loss in multiple dimensions, so as to locate the cause of the abnormality based on the difference analysis. The overall idea is as follows:

[0196] (1) It is necessary to ensure that the basic model ledger and operation data for theoretical line loss calculation are complete and accurate, so that the 96-point theoretical line loss calculation results are accurate;

[0197] (2) Obtain detailed data such as gateway configuration, metering point information, operation data, and calculation results of the line loss calculation of the synchronous line loss system.

[0198] (3) Compare and analyze the theoretical line loss with the line loss results of the same period to analyze the weak links of line loss. If the line loss comparison result exceeds the deviation threshold, it means that the high line loss of the same period is caused by management factors. Feedback to the source end is required to solve the problem of high line loss by checking the basic data ledger model, data accuracy, gateway configuration relationship, line transformer relationship and other management factors, and use management means to manage the source end data; if the line loss comparison result is less than the deviation threshold, it is necessary to further determine whether the theoretical line loss is high loss. If the theoretical line loss is high loss, it is necessary to conduct loss reduction analysis on the high-loss distribution line, locate the high-loss link and formulate loss reduction measures.

[0199] The implementation method of this idea is to use the ETL component to update the distribution network model and equipment operation data to perform theoretical calculations at a 15-minute granularity to generate theoretical line loss calculation results. After exporting the line loss calculation results of the same period in the synchronous system, the data import function of the system ETL component is used to import the line loss calculation results and detailed data of the same period.

[0200] (1) Analysis and processing of model data required for theoretical calculation

[0201] The model data required for theoretical calculation is obtained by downloading CIM files through FTP and parsing the files. First, the CIM model file is downloaded, and the parsing program in the ETL component parses the file to obtain equipment information including distribution lines, distribution transformers, substation users, switches, etc., and then the topology information is parsed to build a calculation model and generate equipment metering points to save the calculation model and metering points.

[0202] (2) Analysis and processing of operating data required for theoretical calculation

[0203] Use the ETL component in the system to theoretically calculate the required model data and download the DT file through FTP, parse the DT file to obtain the active and reactive power, switch status, active and reactive power and other information of the distribution network equipment metering point.

[0204] (3) Gateway Management

[0205] The system has built-in State Grid’s eight standard gateway types, including cross-border transmission gateway, inter-regional transmission gateway, inter-provincial transmission gateway, provincial power supply gateway, municipal power supply gateway, wholesale gateway, power generation gateway and billing user gateway.

[0206] (4) Theoretical calculation

[0207] The distribution network calculation plug-in calculates the loss calculation results of the distribution line and substation at a 15-minute granularity. Then, the calculation results of 96 time points are summarized through the summary function to calculate the loss calculation results of the distribution line and substation for one day.

[0208] (5) Model and checkpoint correspondence

[0209] The theoretical line loss model comes from the source system. The model correspondence plug-in can correspond to the model of the synchronous line loss through the unified code of PO interconnection. For devices that do not have a unique code for PO interconnection, regular expression comparison technology is used to perform fuzzy matching on the device name keywords for automatic matching. For devices that cannot be matched or are automatically matched incorrectly, manual matching or adjustment is required. The correspondence between the theoretical line loss gate and the synchronous system gate consists of two parts. The gate correspondence plug-in uses regular expression comparison technology to automatically match the name keywords such as the digital number in the name and the same keyword in the name. For gates that cannot be matched or are automatically matched incorrectly, manual matching or adjustment is required.

[0210] (6) Comparison results display

[0211] The results are displayed on the web page through a report engine developed based on JavaScript, HTML5 and Echarts front-end technology. First, the server-side report engine component is used to query the active report data, and then the report data is encapsulated into a result set in JSON format, and the result set is sent to the browser through AJAX asynchronous transmission. The browser-side report engine component parses the JSON data set and further processes it to display the report data in a JavaScript data table. Fig.15 shown.

[0212] S3: Line loss allocation positioning

[0213] The high proportion of distributed power access to the distribution network has a certain impact on network losses. Some lines continue to experience high losses due to the access of distributed power, but due to the lack of scientific and reasonable technical means and loss sharing mechanism, distributed power users do not bear any network loss costs. The network loss sharing and traceability functions developed in this project can clarify the source and responsibility of the loss, quickly locate the high-loss subjects of the lines in the multi-subject distribution network, realize reasonable line loss sharing among the subjects, and provide important reference value for the targeted formulation of loss reduction measures and the realization of overall loss reduction.

[0214] The line loss allocation and positioning process is as follows: Fig.16As shown in the figure, firstly, through the system's theoretical line loss comparison and analysis function, the early warning of the lines with high losses in both the theoretical line loss and the synchronous line loss is used as the high-loss lines and substations that need to be focused on; secondly, the network loss allocation and tracing calculation based on any segmented area is carried out for these high-loss lines and substations that need to be focused on, and the network loss allocation and tracing results of the multi-subject distribution network are automatically output; then, the loss allocated to each subject in the summarized distribution lines and substations and the flow calculation results are combined to analyze the loss results of each subject; finally, according to the loss and proportion of each subject, the high-loss subject in the multi-subject distribution network is located.

[0215] S4: Loss reduction potential analysis

[0216] The pre-loss reduction assessment analysis includes two aspects: loss reduction decision support and pre-loss reduction assessment.

[0217] Loss reduction decision support is used to formulate loss reduction measures. It is necessary to summarize the professional knowledge and experience of line loss management and build it into a loss reduction decision support expert database to assist line loss management personnel in formulating loss reduction measures. Pre-loss reduction assessment can quantify the loss reduction plan and measures through the system's built-in algorithm, and evaluate the loss reduction effect that the loss reduction plan or measures can bring. After completing the line loss analysis and high-loss positioning, loss reduction plans and loss reduction measures can be formulated in a targeted manner according to the loss responsibility and loss degree of each entity, and the loss reduction plan can be simulated and optimized to finally determine the loss reduction plan.

[0218] like Fig.17 As shown in the figure, an expert knowledge base for loss reduction decision support is established. The construction process of the knowledge base is mainly through the construction of rule condition factors, and then the rule conditions are set through the construction of rule condition factors, and then the rule conclusions are maintained. The rule table of corresponding rule conclusions is obtained through certain rule conditions. The system obtains a summary table of suggestions through reasoning based on the rule table, and generates corresponding suggestion details according to the summarized suggestions.

[0219] The steps for building the expert knowledge base are as follows:

[0220] First, knowledge acquisition. Knowledge acquisition is to extract knowledge by extensively collecting domain experts, expressing the knowledge in an appropriate way, and then converting the knowledge into a form that can be stored by computers.

[0221] Second, after the expert domain knowledge is acquired, the knowledge is stored in a computer database. After testing and refinement, a highly reliable expert knowledge base is formed.

[0222] The knowledge about energy consumption diagnosis and loss reduction auxiliary decision-making of distribution network in the distribution network loss reduction auxiliary decision-making expert system is mainly production rules, so the knowledge base is implemented according to the production rules.

[0223] (1) Condition factor maintenance

[0224] Condition factor: various parameters involved in the production rules, such as theoretical calculation results, energy efficiency evaluation results, or basic properties of power grid equipment. Condition factor is the smallest unit that constitutes a condition and is used to indicate the way to obtain various parameters in the condition.

[0225] In order to realize the existing loss reduction auxiliary decision-making function, a part of the built-in condition factors have been initialized into the expert system. At the same time, in order to realize the dynamic maintenance of knowledge, the use of database scripts to maintain user-added condition factors has also been realized. The current built-in condition factors include:

[0226] 1) Static Factor

[0227] It includes the economic load current of the conductor, the maximum load current of the conductor, the loss before conductor replacement, the maximum value of the standard power supply radius, the power factor limit, the average load factor of the distribution transformer, the number of years the distribution transformer has been in operation, the operating life of the distribution transformer, the short-circuit loss limit of the distribution transformer, the economic load factor of the distribution transformer, the no-load loss limit of the distribution transformer, the commissioning time of the distribution transformer, the minimum voltage limit, the maximum voltage limit, etc.

[0228] 2) Dynamic Factor

[0229] Including head-end voltage, power supply radius, distribution transformer no-load loss, distribution transformer short-circuit loss, power factor, etc.

[0230] (2) Condition maintenance

[0231] Condition: It is a logical judgment expression composed of conditional factors and is a necessary part of the rule.

[0232] The currently built-in conditions are:

[0233] 1) Distribution transformer no-load loss > distribution transformer no-load loss limit

[0234] 2) Distribution transformer short-circuit loss > distribution transformer short-circuit loss limit value

[0235] 3) Maximum load current of conductor > economic load current of conductor

[0236] 4) The number of years the distribution transformer has been in operation > the operating life of the distribution transformer

[0237] 5) Distribution transformer economic load factor × distribution transformer economic load factor > distribution transformer average load factor

[0238] 6) Distribution transformer average load factor>1

[0239] 7) Distribution transformer average load factor>0

[0240] 8) The voltage at the first end is less than the minimum voltage limit.

[0241] 9) The voltage at the first end is greater than the maximum voltage limit.

[0242] (3) Conclusion maintenance

[0243] The conclusion is the result output when the rules are met. It is a suggestion for loss reduction and transformation measures output through logical reasoning based on the conditions.

[0244] The system has formed a wealth of loss reduction measures, including: conductor optimization, transformer optimization, voltage optimization, distributed power access location optimization, substation access location optimization, etc. The above conclusions have been built into the system, and users only need to select the corresponding loss reduction measures according to the actual situation to complete the loss reduction decision-making.

[0245] The built-in conclusions are:

[0246] 1) Replacement of high energy consumption transformer

[0247] 2) Economical operation transformer replacement

[0248] 3) Replacement of transformers with long service life

[0249] 4) 5-20kV conductor replacement

[0250] 5) 400V wire replacement

[0251] 6) Wiring and substation voltage optimization

[0252] 7) Optimization of 5-20kV distributed power access location

[0253] 8) Optimization of access location in the substation area

[0254] (4) Rule maintenance and algorithm research

[0255] Rule: A production rule consists of a condition P and a conclusion Q. Its expression is “P→Q” or “ifP then Q”, which means that when the premise P of the production rule is met, the conclusion Q should be obtained.

[0256] After maintaining the conditions and conclusions, users can create custom rules. Rules can be a logical combination of multiple conditions, thus realizing the conditional editing formula function of rules. At the same time, the conclusion can also be used as the premise of another rule to realize the "chain rule".

[0257] After the distribution network is calculated or the energy efficiency is evaluated, loss reduction recommendations are made in turn according to the loss reduction judgment standards. Currently, there are the following judgment standards for distribution networks: ① Replace high-energy-consuming transformers, ② Replace non-economically operated transformers, ③ Replace long-life transformers, ④ Replace conductors, ⑤ Voltage optimization, ⑥ Distributed power access location optimization, ⑦ Substation access location optimization. The judgment standards for 10kV distribution networks are ①②③④⑤⑥, and the judgment standards for low-voltage substations are ④⑤⑦.

[0258] like Fig.18 As shown in the figure, the automatic reasoning machine is constructed. Based on the expert knowledge base constructed by the system and combined with the original data such as the power grid model, theoretical line loss calculation and energy efficiency evaluation, the system can realize the expert reasoning process through the automatic reasoning machine, as follows:

[0259] The first step: loading the original data is to load the original data such as theoretical line loss calculation results.

[0260] Step 2: Load the knowledge base, such as loading the prerequisites of the rules, the conclusion suggestions of the rules, etc.

[0261] Step 3: Determine the analysis knowledge items, such as the definition of power factor and power factor limit value.

[0262] Step 4: Substitute the original data into the knowledge item, such as substituting the power factor value into the corresponding knowledge item.

[0263] Step 5: Perform logical reasoning and conduct a judgment and analysis process on the original data through the premise conditions.

[0264] Step 6: Output the loss reduction conclusion, and output the rule recommendation conclusion obtained through the analysis and judgment in the previous step.

[0265] For example, when replacing a conductor, it is necessary to determine whether there is a calculation result for the conductor based on the theoretical calculation results of the distribution line. If not, there is no need to replace it. If there is a calculation result, determine whether its line loss rate is high loss. If the line loss rate meets the economic line loss, there is no need to replace it. If not, determine whether the average load current of the conductor is greater than the economic current of the conductor. If so, there is no need to replace it. If not, match the economic cross-section according to the economic current. If not, there is no need to replace it. If it is an economic cross-section, match the corresponding model in the parameter library. If no corresponding model is matched, no replacement is performed. If there is a matching model, a suggestion for replacing the conductor is given.

[0266] 3. Assessment before loss reduction

[0267] like Fig.19 The following is the auxiliary decision-making page for power distribution line loss reduction: Fig. 20 The figure shows the auxiliary decision-making page for loss reduction in low-voltage substations. The system supports the setting of several loss reduction plans for distribution networks or substations. By simulating and calculating different loss reduction plans, the loss reduction data that can be obtained by each loss reduction plan can be obtained. This allows line loss management staff to consider investment cost and loss reduction effect to select the required loss reduction plan.

[0268] The loss reduction plan in this system refers to a set of loss reduction measures formulated for the entire unit distribution network or substation. The loss reduction measures for the distribution network include transformer optimization, conductor optimization, voltage optimization, and distributed power access location optimization. The loss reduction measures for the substation include conductor optimization, voltage optimization, and substation access location optimization. After selecting the loss reduction measures, detailed measures can be formulated for different wiring and substation equipment, such as changing the transformer model, changing the conductor model and length, etc. After the loss reduction plan is formulated, the loss reduction effect can be simulated and calculated to obtain the estimated line loss rate change, the estimated annual power saving, the estimated annual power saving income and other result data. The line loss management personnel can decide whether to adopt the plan based on these estimated result data and the initial investment cost data.

[0269] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0270] In addition, unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

Claims

1. A method for allocating network losses of a distributed power distribution system, characterized in that: The following steps are involved: According to the obtained topological graph and operation data of the wiring or substation area, the wiring or substation area is arbitrarily divided into several segmented areas; Taking the segmented area as the main body for equivalent division, a plurality of equivalent areas are obtained; The total generator power and total load power of each equivalent area are equivalent to one generator and one load. The power flow source nodes of each segmented area are tracked by the power flow tracking method to determine the power flow path of each segmented area, and the loss and loss ratio borne by the conductor on the power flow path of each segmented area are obtained; According to the losses and loss proportions borne by the conductors on the power flow paths of each segmented area, the average network loss coefficient method is used, which takes into account the participating entities including the power source entity, the load entity and the energy storage entity; the line loss borne by each type of participating entity is obtained by calculating the line loss coefficients of each participating entity; according to the line loss borne by each type of participating entity, the loss is apportioned according to the proportion of power supply and consumption, and the loss in the segmented area is apportioned to each equivalent area, and the loss and proportion apportioned to each equivalent area are determined; The losses and proportions allocated to each equivalent area are summarized, and the distribution line or substation network loss allocation results are output.

2. The method for allocating network losses of a distributed power distribution system according to claim 1, characterized in that: The said arbitrarily dividing the wiring or station area into a plurality of divided areas specifically includes: Obtain topological graphics and operation data of wiring or substations; Input the data required for calculation, calculate the wiring and substation flow, and arbitrarily divide the wiring and substation flow into several divided areas in the flow calculation graph.

3. The method for allocating network losses of a distributed power distribution system according to claim 2, characterized in that: The determining of the power flow path of each segmented area specifically includes: Obtain the topological diagram of the distribution line or substation, as well as the power flow calculation and network loss allocation calculation result data; According to the obtained topological diagram of the distribution line or substation and the power flow calculation and network loss sharing calculation result data, the power flow path of the sharing entity is tracked by the power flow tracking method to obtain the complete power flow path of each sharing entity from the power node to the load node.

4. The method for allocating network losses of a distributed power distribution system according to claim 3, characterized in that: The obtaining of the loss and loss ratio borne by the conductor on the power flow path of each segmented area specifically includes: Based on the complete power flow path from the power node to the load node of each apportionment entity, the loss and proportion borne by each conductor, power source, and load on the power flow path of each divided area are quantified through line loss tracing analysis and calculation method; According to the results of power flow calculation and allocation, a segmentation area is selected and the power flow path of the segmentation area is traced; Calculate the power contribution of each conductor segment on the power flow path to the divided area; According to the power contribution, calculate the loss and proportion of each power source and conductor segment on the power flow path; When traversing all the segmented areas, the loss and loss ratio borne by the conductor on the power flow path of each segmented area are output.

5. The method for allocating network losses of a distributed power distribution system according to claim 4, characterized in that: The line losses borne by each type of participating entity are specifically obtained as follows: The participants of the improved average network loss coefficient method include power source, load and energy storage. According to the distribution coefficients of the power source, load and energy storage, the electricity consumption is apportioned according to the proportion of power supply and consumption, where: The line loss coefficient calculation formula of the power supply body is: The calculation formula of the line loss coefficient of the load body is: For the energy storage entity, when the system power supply is greater than the load power consumption, the energy storage entity stores the excess power; when the system power supply is less than the load power consumption, the energy storage system outputs power to the system, and the energy storage system does not share the network loss when it is not in operation; The operation modes of the energy storage subject include three situations: power supply operation, load operation and non-operation; When the energy storage entity is used as a power source, it is used as a power source to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the power source entity is: When the energy storage system operates as a load, it is used as a load to participate in the network loss sharing calculation. The line loss coefficient calculation formula for the energy storage entity and the load entity is: According to the line loss coefficient of the participating entity, the line loss L borne by a certain type of participating entity is calculated. j for: L j =λP j Where n represents the total number of power nodes; m represents the total number of load nodes; j represents the node number of the participating entity; P i represents the power of power node i; P k represents the power load of load k; P Gi represents the injected power of power source G at node i; P DESt represents the active power of energy storage participating node t; P LK Represents the node load demand vector P L The kth component of j represents the active power of the participating node j; P loss The total network line loss.

6. The method for allocating network losses of a distributed power distribution system according to claim 5, characterized in that: It also includes summarizing and outputting the line loss tracing results of each segmented area based on the losses and loss proportions borne by the conductors on the power flow paths of each segmented area.

7. The method for allocating network losses of a distributed power distribution system according to claim 6, characterized in that: The output distribution line or substation network loss allocation results and output line loss tracing results specifically include: Obtain network loss allocation report and line loss tracing report. Use network loss allocation report to check network loss allocation results of distribution lines or substations on power flow calculation graph. Use line loss tracing report to check line loss tracing results of each segmented area on power flow calculation graph.

8. The method for allocating network losses of a distributed power distribution system according to claim 7, characterized in that: The network loss allocation report includes a distribution network loss allocation hourly report and a substation network loss allocation hourly report; the distribution network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the distribution line, including the allocated loss and allocation ratio result data of each equivalent area; the substation network loss allocation hourly report is used to query the calculation results of each equivalent area at each hour within a certain time period of the substation, including the allocated loss and allocation ratio result data of each equivalent area.

9. The method for allocating network losses of a distributed power distribution system according to claim 8, characterized in that: The line loss tracing report includes a distribution line loss tracing hourly report and a substation line loss tracing hourly report; the distribution line loss tracing hourly report is used to query the flow tracing hourly calculation results of each segmented area at each moment within a certain time period of the distribution line, including the loss borne by the conductor segment on the flow path and the loss proportion result data; the substation line loss tracing hourly report is used to query the flow tracing hourly calculation results of each segmented area at each moment within a certain time period of the substation, including the loss borne by the conductor segment on the flow path and the loss proportion result data.

10. A network loss sharing system for a distributed power distribution network, characterized in that: include: The area division module is used to arbitrarily divide the wiring or substation area into several divided areas according to the obtained topological graph and operation data of the wiring or substation area; the divided area is used as the main body for equivalent division to obtain multiple equivalent areas; The loss allocation module of each segmented area is used to determine the tie line power and loss by allocating the tie line loss between the segmented areas to the equivalent generators and equivalent loads in each segmented area; according to the tie line power and loss, the loss of each segmented area is allocated to each generator and load to obtain the allocated tie line loss of each segmented area; according to the regional allocation of tie line loss, the network loss allocation ratio of the regional tie line between the regional entities is determined; Each equivalent area loss allocation module is used to track the flow source node of each allocation subject, determine the flow path of each allocation subject, and obtain the loss and loss proportion borne by the wire on the flow path of each allocation subject; The allocation result output module is used to summarize the losses and proportions allocated to each equivalent area and output the distribution line or substation network loss allocation results.

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