A method and system for dynamically evaluating line loss indicators in power supply areas

Abstract

The present invention discloses a method and system for dynamically evaluating line loss indicators in a power supply substation. The method of the present invention specifically includes: determining the basic line loss indicators of the power supply substation; determining the line loss impact value of the power equipment in the power supply substation through the data of the old power equipment in the power supply substation and the operating load of the old power equipment; dividing the power users into high line loss users and low line loss users according to the power supply radius and the power supply voltage level; determining the line loss indicator according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss indicator. The present invention achieves further compensation for the line loss situation of the power supply substation from the age of the power equipment by determining the line loss impact value of the power equipment in the power supply substation, fully considering the impact of the age of the power equipment on the line loss, and ensuring the accuracy of the determination of the line loss indicator.

Description

Technical Field

[0001] The present invention relates to the technical field of line loss analysis in power supply areas, and more specifically, to a method and system for dynamically evaluating line loss indicators in power supply areas. Background Art

[0002] In the process of line loss analysis and processing of power supply substations, the levels of power equipment in different power supply substations are different to a certain extent, so it is necessary to determine differentiated line loss indicators. In existing literature solutions, such as "A Substation Line Loss Analysis Method and System Based on Improved Weighted Grey Correlation Analysis", the construction of a line loss analysis calculation model is realized by analyzing the electrical characteristic indicators of the substation and the correlation with the substation line loss, and based on the optimal strong correlation parameters, the substation line loss is calculated and predicted. However, there are the following technical problems:

[0003] 1. When dynamically determining the line loss index, in addition to the influence of user type and load, the age of the electrical equipment in the power supply station and the influence of the operating load, when the electrical equipment or transmission lines operate above the rated capacity for a long time, the line loss in the power supply station is significantly higher. Therefore, if the above factors are not taken into account, it is impossible to accurately determine the line loss index of the power supply station.

[0004] 2. When dynamically determining the line loss index, since there are large differences in the power supply radius of different power supply areas, and the line loss is often linearly related to the power supply radius of the power supply area, if the power users cannot be divided according to different power supply radii, the calculated line loss index of the power supply area cannot be accurate. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a method and system for dynamically evaluating line loss indicators in a power supply station area.

[0006] The present invention provides a method for dynamically evaluating line loss indicators in a power supply area, which is implemented by the following technical scheme, specifically including:

[0007] S1. Obtain the number and load ratio of different types of power users in the power supply area, and determine the basic line loss index of the power supply area in combination with the power load of the power supply area;

[0008] S2. Determine the old power equipment according to the operating years of the power equipment in the power supply area, and determine the line loss impact value of the power equipment in the power supply area according to the data of the old power equipment in the power supply area and the operating load of the old power equipment, and judge whether the line loss impact value of the power equipment meets the requirements, if so, proceed to the next step, if not, proceed to step S4;

[0009] S3. Determine the power supply radius of different power users in the power supply area, and divide the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determine whether the accuracy of the basic line loss index meets the requirements according to the user data of the high line loss users and the low line loss users. If so, determine the line loss index of the power supply area according to the basic line loss index; if not, determine the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users, and proceed to the next step;

[0010] S4. Determine the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

[0011] A further technical solution is that the types of electricity users include but are not limited to residential users, commercial users, and industrial users.

[0012] A further technical solution is that the method for determining the basic line loss index of the power supply area is:

[0013] Acquiring the power load of the power supply area, and determining the basic line loss index of the power supply area according to the power load of the power supply area;

[0014] Determine the complexity of the power topology of the power supply area according to the load proportion of different types of power users in the power supply area, and judge whether the complexity of the power topology of the power supply area is greater than a preset complexity threshold, if so, proceed to the next step, if not, determine the basic line loss index of the power supply area through the basic line loss index of the power supply area;

[0015] The line loss index compensation amount of the power supply area is determined by the proportion of the number of different types of power users and the proportion of load in the power supply area, and the basic line loss index of the power supply area is determined based on the line loss index compensation amount of the power supply area and the basic line loss index.

[0016] A further technical solution is that the method for determining the line loss index of the power supply area is:

[0017] A comprehensive line loss impact value is determined based on the line loss impact value of the power supply radius of the power supply substation and the line loss impact value of the power equipment, and a line loss index of the power supply substation is determined based on the comprehensive line loss impact value and the basic line loss index.

[0018] The method for determining the line loss impact value of the power equipment in the power supply area is:

[0019] S2.1 determines the number and proportion of old power equipment in the power supply area through the data of old power equipment in the power supply area, and determines whether the number and proportion of old power equipment in the power supply area meet the requirements. If so, proceed to step S2.2, if not, proceed to step S2.3;

[0020] S2.2 determines whether the operating load of the old power equipment in the power supply area and the operating load ratio of the old power equipment meet the requirements. If so, it is determined that the line loss impact value of the power equipment in the power supply area is zero. If not, proceed to the next step;

[0021] S2.3 Determine the number, proportion and service life of the old power equipment in different types of power equipment in the power supply area according to the type and number of the old power equipment in the power supply area, and determine the line loss value affected by the number of old power equipment in the power supply area in combination with the weight values ​​of different types of power equipment;

[0022] S2.4 Determine the operating load, operating load proportion and operating years of the old power equipment in the different types of power equipment in the power supply substation according to the type and operating load of the old power equipment in the power supply substation, and determine the line loss value affected by the operation of the old power equipment in the power supply substation in combination with the weight values ​​of the different types of power equipment;

[0023] S2.5 Determine the line loss impact value of the power equipment in the power supply substation according to the line loss value affected by the operation of the old power equipment in the power supply substation and the line loss value affected by the number of the old power equipment in the power supply substation.

[0024] The method for determining the weight values ​​of different types of power equipment is: determining the line loss proportion of the type of power equipment in the power supply area according to the type of the power equipment, and determining the weight values ​​of the different types of power equipment according to the line loss proportion.

[0025] The method for determining the line loss impact value of the power supply radius of the power supply area is:

[0026] S3.1 Determine the line loss impact value of the high line loss users in the power supply area according to the load proportion, power supply radius and number of the high line loss users;

[0027] S3.2 determines whether the load proportion of the low line loss users is less than the preset load proportion, if so, proceeds to step S3.3, if not, proceeds to step S3.4;

[0028] S3.3 determines whether the number of the low line loss users is less than the preset number limit value, if so, the line loss impact value of the power supply radius of the power supply area is determined by the line loss impact value of the high line loss users in the power supply area, if not, proceeds to the next step;

[0029] S3.4 Determine the line loss impact value of low line loss users in the power supply area through the load proportion, power supply radius and number of the low line loss users, determine the high load users among the high line loss users through the power load of the high line loss users, and determine the line loss impact value of the power supply radius of the power supply area through the line loss impact values ​​of the high line loss users, the line loss impact values ​​of the low line loss users, the power supply radius of the power supply area, the number of high load users and the power supply radius.

[0030] On the other hand, the present invention provides a power supply area line loss index dynamic evaluation system, which adopts the above-mentioned power supply area line loss index dynamic evaluation method, specifically comprising:

[0031] Basic line loss index determination module; Power equipment evaluation module; Line loss user evaluation module; Line loss index determination module;

[0032] The basic line loss index determination module is responsible for obtaining the quantity ratio and load ratio of different types of power users in the power supply area, and determining the basic line loss index of the power supply area in combination with the power load of the power supply area;

[0033] The power equipment evaluation module is responsible for determining old power equipment according to the operating years of the power equipment in the power supply area, and determining the line loss impact value of the power equipment in the power supply area through the data of the old power equipment in the power supply area and the operating load of the old power equipment;

[0034] The line loss user evaluation module is responsible for determining the power supply radius of different power users in the power supply area, and dividing the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determining the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users;

[0035] The line loss index determination module is responsible for determining the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention determines the basic line loss index of the power supply substation, thereby realizing the determination of the basic line loss index from two perspectives: the type of different power users and the power load of the power supply substation, thereby avoiding the technical problem of inaccurate evaluation results of the line loss index due to the complexity of the power supply lines of the power users caused by only considering the power load.

[0038] By determining the line loss impact value of the power equipment in the power supply substation, further compensation for the line loss situation in the power supply substation is achieved based on the age of the power equipment. The impact of the age of the power equipment on the line loss is fully considered, ensuring the accuracy of the determination of the line loss index.

[0039] The present invention determines the line loss impact value of the power supply radius of the power supply substation, thereby realizing the evaluation of the impact of the difference in power supply radius on the line loss situation of the power supply substation. It not only takes into account the impact of different power supply radii, but also takes into account the differences between power users under different power supply radii, thereby improving the accuracy and comprehensiveness of the evaluation of line loss indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a flowchart for implementing the method of the present invention. DETAILED DESCRIPTION

[0041] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Example

[0042] like Figure 1 According to one aspect of the present invention, a method for dynamically evaluating line loss indicators in a power supply area is provided, which specifically includes:

[0043] S1. Obtain the number and load ratio of different types of power users in the power supply area, and determine the basic line loss index of the power supply area in combination with the power load of the power supply area;

[0044] Specifically, the types of electricity users include but are not limited to residential users, commercial users, and industrial users.

[0045] Specifically, the method for determining the basic line loss index of the power supply area is:

[0046] The power load of the power supply area is obtained, and the basic line loss index of the power supply area is determined according to the power load of the power supply area; the basic line loss index is determined by a preset linear mapping function, or according to the interval where the power load is located, using a preset basic line loss index corresponding to the interval; specifically, for example, the power load is 200,000 KW, and the interval where it is located is between 100,000 kW and 300,000 KW, and the corresponding preset line loss index is 1%;

[0047] Determine the complexity of the power topology of the power supply area according to the load proportion of different types of power users in the power supply area, and judge whether the complexity of the power topology of the power supply area is greater than a preset complexity threshold, if so, proceed to the next step, if not, determine the basic line loss index of the power supply area through the basic line loss index of the power supply area;

[0048] The determination of the basic line loss index is more specifically to determine the line loss index compensation amount of the power supply area through the proportion of the number of different types of electricity users and the proportion of load in the power supply area, and determine the basic line loss index of the power supply area based on the line loss index compensation amount of the power supply area and the basic line loss index. When a target data is determined by multiple groups of data, it can be determined by existing methods such as the existing hierarchical analysis method and BP neural network. The proportion of the number of different types of electricity users and the proportion of load are used as the input of the BP neural network, and the line loss index compensation amount is used as the output; after obtaining, the compensation amount and the basic line loss index are summed to obtain the basic line loss index. The specific steps are as follows:

[0049] 1. Data Preprocessing

[0050] Data normalization: The range of input data (the number and load ratio of different types of power users in the power supply area) is scaled to a specific interval, usually [-1, 1] or [0, 1]. This step is to speed up training and improve model accuracy. In MATLAB, you can use the mapminmax function for normalization.

[0051] Data partitioning: Divide the dataset into training set, validation set and test set. The usual ratio is 70% for training, 15% for validation and 15% for testing.

[0052] Use a random function (such as randperm in MATLAB) to randomly select the index of the data and then divide it into training set, validation set and test set respectively.

[0053] 2. Network Construction

[0054] Determine the network structure: including the number of neurons in the input layer, hidden layer (can be one or more), and output layer. Choose the appropriate number of layers and neurons based on the complexity of the problem and the characteristics of the data.

[0055] Initialization parameters: Randomly initialize the weights and biases of all connections in the network. These values ​​are usually randomly assigned to a small range to prevent gradient disappearance or gradient explosion during training.

[0056] Set the activation function: The activation function is used to implement nonlinear mapping relationships within neurons. Commonly used functions include Sigmoid function, Tanh function, and ReLU function. Choose a suitable activation function according to the needs of the problem.

[0057] 3. Network Training

[0058] Forward propagation: Input data enters the network through the input layer, and after weighted sum operation and activation function processing, it propagates forward layer by layer to the output layer. The output of each layer is calculated until the output of the output layer is obtained.

[0059] Error calculation: Compare the output of the output layer (line loss index compensation amount) with the expected output (i.e. the true value) to calculate the error. The commonly used error function is the mean square error (MSE), but other error functions can also be selected as needed.

[0060] Back propagation: Propagate the error from the output layer back to the input layer, and calculate the gradient of each layer weight based on the error signal. Use the chain rule to calculate the gradient of the error with respect to each layer weight.

[0061] Weight update: Update weights and biases according to gradient descent or other optimization algorithms to reduce the error. The update formula usually includes a learning rate (which determines the step size of the weight update) and a gradient value.

[0062] Iterative training: Repeat the forward propagation, error calculation, and back propagation steps until the stopping condition is met (such as reaching the maximum number of iterations, the error is less than a predetermined threshold, etc.).

[0063] IV. Effect Evaluation

[0064] Model training effect evaluation: Use the validation set to evaluate the performance of the model during the training process in order to adjust parameters and prevent overfitting.

[0065] Evaluation of model prediction effect: Use the test set to evaluate the generalization ability of the model on unknown data.

[0066] Calculate error metrics (such as MSE, MAE, etc.) on the test set to evaluate model performance.

[0067] 5. Model Application

[0068] The trained BP neural network model is applied to practical problems. The input is the proportion of the number of different types of power users and the proportion of load in the power supply area, and the output is the line loss index compensation.

[0069] It should be noted that the complexity of the power topology of the power supply area is determined according to the load proportion of the power user types in the power supply area. Specifically, the higher the load proportion of residential users in the power supply area and the lower the load proportion of industrial users and commercial users, the higher the complexity of the power topology of the power supply area.

[0070] In one possible embodiment, the complexity of the power topology of the power supply area is determined by the load proportion and quantity proportion of the residential users in the power supply area.

[0071] In this embodiment, by determining the basic line loss index of the power supply substation, it is possible to determine the basic line loss index from two perspectives: the type of different power users and the power load of the power supply substation, thereby avoiding the technical problem of inaccurate evaluation results of the line loss index due to the complexity of the power supply lines of the power users caused by only considering the power load.

[0072] S2. Determine the old power equipment according to the operating years of the power equipment in the power supply area, and determine the line loss impact value of the power equipment in the power supply area according to the data of the old power equipment in the power supply area and the operating load of the old power equipment, and judge whether the line loss impact value of the power equipment meets the requirements, if so, proceed to the next step, if not, proceed to step S4;

[0073] Specifically, when the operating life of the power equipment in the power supply area is greater than the set life, it is determined that the power equipment in the power supply area is old power equipment.

[0074] In one possible embodiment, the old power equipment may be determined by combining historical fault operation data, operation data exceeding the rated operation load, and operation years.

[0075] Furthermore, the method for determining the line loss impact value of the power equipment in the power supply area is:

[0076] S2.1 determines the number and proportion of old power equipment in the power supply area through the data of old power equipment in the power supply area, and determines whether the number and proportion of old power equipment in the power supply area meet the requirements. If so, proceed to step S2.2, if not, proceed to step S2.3;

[0077] S2.2 determines whether the operating load of the old power equipment in the power supply area and the operating load ratio of the old power equipment meet the requirements. If so, it is determined that the line loss impact value of the power equipment in the power supply area is zero. If not, proceed to the next step;

[0078] S2.3 Determine the number, proportion and service life of the old power equipment in different types of power equipment in the power supply area according to the type and number of the old power equipment in the power supply area, and determine the line loss value affected by the number of old power equipment in the power supply area in combination with the weight values ​​of different types of power equipment;

[0079] S2.4 Determine the operating load, operating load proportion and operating years of the old power equipment in the different types of power equipment in the power supply substation according to the type and operating load of the old power equipment in the power supply substation, and determine the line loss value affected by the operation of the old power equipment in the power supply substation in combination with the weight values ​​of the different types of power equipment;

[0080] S2.5 Determine the line loss impact value of the power equipment in the power supply substation according to the line loss value affected by the operation of the old power equipment in the power supply substation and the line loss value affected by the number of the old power equipment in the power supply substation.

[0081] Specifically, the method for determining the weight values ​​of the different types of power equipment is:

[0082] The line loss proportion of the type of power equipment in the power supply area is determined according to the type of the power equipment, and the weight values ​​of the different types of power equipment are determined according to the line loss proportion.

[0083] In one possible embodiment, the line loss ratio can be determined through historical observation data.

[0084] In this embodiment, by determining the line loss impact value of the power equipment in the power supply substation, further compensation for the line loss situation in the power supply substation is achieved based on the age of the power equipment. The impact of the age of the power equipment on the line loss is fully considered, ensuring the accuracy of the determination of the line loss index.

[0085] S3. Determine the power supply radius of different power users in the power supply area, and divide the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determine whether the accuracy of the basic line loss index meets the requirements according to the user data of the high line loss users and the low line loss users. If so, determine the line loss index of the power supply area according to the basic line loss index; if not, determine the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users, and proceed to the next step;

[0086] Specifically, the power users are divided into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, which specifically includes:

[0087] Determine whether the power supply radius of the power user is greater than a preset distance, if so, classify the power user as a high line loss user, if not, proceed to the next step;

[0088] Determine whether the power supply radius of the power user is less than a second preset distance, wherein the second preset distance is less than the preset distance, and if so, classify the power user as a low line loss user; if not, proceed to the next step;

[0089] Determining whether the accuracy of the basic line loss index meets the requirement according to the user data of the high line loss user and the low line loss user, specifically includes:

[0090] When the load proportion or quantity proportion of the power load of the high line loss users is greater than a preset value, it is determined that the accuracy of the basic line loss index does not meet the requirement.

[0091] Furthermore, the method for determining the line loss impact value of the power supply radius of the power supply area is:

[0092] S3.1 Determine the line loss impact value of the high line loss users in the power supply area according to the load proportion, power supply radius and number of the high line loss users;

[0093] S3.2 determines whether the load proportion of the low line loss users is less than the preset load proportion, if so, proceeds to step S3.3, if not, proceeds to step S3.4;

[0094] S3.3 determines whether the number of the low line loss users is less than the preset number limit value, if so, the line loss impact value of the power supply radius of the power supply area is determined by the line loss impact value of the high line loss users in the power supply area, if not, proceeds to the next step;

[0095] S3.4 Determine the line loss impact value of low line loss users in the power supply area through the load proportion, power supply radius and number of the low line loss users, determine the high load users among the high line loss users through the power load of the high line loss users, and determine the line loss impact value of the power supply radius of the power supply area through the line loss impact values ​​of the high line loss users, the line loss impact values ​​of the low line loss users, the power supply radius of the power supply area, the number of high load users and the power supply radius.

[0096] In this embodiment, by determining the line loss impact value of the power supply radius of the power supply substation, the impact of the difference in power supply radius on the line loss situation in the power supply substation is evaluated. Not only the impact of different power supply radii is taken into account, but also the differences between power users under different power supply radii are taken into account, thereby improving the accuracy and comprehensiveness of the evaluation of line loss indicators.

[0097] S4. Determine the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

[0098] Specifically, the method for determining the line loss index of the power supply area is:

[0099] A comprehensive line loss impact value is determined based on the line loss impact value of the power supply radius of the power supply substation and the line loss impact value of the power equipment, and a line loss index of the power supply substation is determined based on the comprehensive line loss impact value and the basic line loss index. Example

[0100] On the other hand, the present invention provides a power supply area line loss index dynamic evaluation system, which adopts the above-mentioned power supply area line loss index dynamic evaluation method, specifically including: a basic line loss index determination module; a power equipment evaluation module; a line loss user evaluation module; a line loss index determination module;

[0101] The basic line loss index determination module is responsible for obtaining the quantity ratio and load ratio of different types of power users in the power supply area, and determining the basic line loss index of the power supply area in combination with the power load of the power supply area;

[0102] The power equipment evaluation module is responsible for determining old power equipment according to the operating years of the power equipment in the power supply area, and determining the line loss impact value of the power equipment in the power supply area through the data of the old power equipment in the power supply area and the operating load of the old power equipment;

[0103] The line loss user evaluation module is responsible for determining the power supply radius of different power users in the power supply area, and dividing the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determining the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users;

[0104] The line loss index determination module is responsible for determining the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

[0105] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for dynamically evaluating line loss indicators in a power supply area, characterized in that: The specific steps include: S1. Obtain the number and load ratio of different types of power users in the power supply area, and determine the basic line loss index of the power supply area in combination with the power load of the power supply area; S2. Determine the old power equipment according to the operating years of the power equipment in the power supply area, and determine the line loss impact value of the power equipment in the power supply area according to the data of the old power equipment in the power supply area and the operating load of the old power equipment, and judge whether the line loss impact value of the power equipment meets the requirements, if so, proceed to the next step, if not, proceed to step S4; S3. Determine the power supply radius of different power users in the power supply area, and divide the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determine whether the accuracy of the basic line loss index meets the requirements according to the user data of the high line loss users and the low line loss users. If so, determine the line loss index of the power supply area according to the basic line loss index; if not, determine the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users, and proceed to the next step; S4. Determine the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

2. The method for dynamic evaluation of line loss index in power supply area according to claim 1 is characterized in that: The method for determining the basic line loss index of the power supply area is: First, the power load of the power supply area is obtained, and the basic line loss index of the power supply area is determined according to the power load of the power supply area; Secondly, the complexity of the power topology of the power supply area is determined according to the load proportion of different types of power users in the power supply area, and it is judged whether the complexity of the power topology of the power supply area is greater than a preset complexity threshold. If so, the next step is entered; if not, the basic line loss index of the power supply area is determined by the basic line loss index of the power supply area; Finally, the line loss index compensation amount of the power supply area is determined by the proportion of the number of different types of power users and the proportion of load in the power supply area, and the basic line loss index of the power supply area is determined based on the line loss index compensation amount of the power supply area and the basic line loss index.

3. The method for dynamic evaluation of line loss index in power supply area according to claim 1 is characterized in that: The method for determining the line loss index of the power supply substation is: determining a comprehensive line loss impact value based on the line loss impact value of the power supply radius of the power supply substation and the line loss impact value of the power equipment, and determining the line loss index of the power supply substation through the comprehensive line loss impact value and the basic line loss index.

4. The method for dynamic evaluation of line loss index in power supply area according to claim 1 is characterized in that: The method for determining the line loss impact value of the power equipment in the power supply area is: S2.1 determines the number and proportion of old power equipment in the power supply area through the data of old power equipment in the power supply area, and determines whether the number and proportion of old power equipment in the power supply area meet the requirements. If so, proceed to step S2.2, if not, proceed to step S2.3; S2.2 determines whether the operating load of the old power equipment in the power supply area and the operating load ratio of the old power equipment meet the requirements. If so, it is determined that the line loss impact value of the power equipment in the power supply area is zero. If not, proceed to the next step; S2.3 Determine the number, proportion and service life of the old power equipment in different types of power equipment in the power supply area according to the type and number of the old power equipment in the power supply area, and determine the line loss value affected by the number of old power equipment in the power supply area in combination with the weight values ​​of different types of power equipment; S2.4 Determine the operating load, operating load proportion and operating years of the old power equipment in the different types of power equipment in the power supply substation according to the type and operating load of the old power equipment in the power supply substation, and determine the line loss value affected by the operation of the old power equipment in the power supply substation in combination with the weight values ​​of the different types of power equipment; S2.5 Determine the line loss impact value of the power equipment in the power supply substation according to the line loss value affected by the operation of the old power equipment in the power supply substation and the line loss value affected by the number of the old power equipment in the power supply substation.

5. The method for dynamic evaluation of line loss index in power supply area according to claim 4 is characterized in that: The method for determining the weight values ​​of different types of power equipment is: determining the line loss proportion of the type of power equipment in the power supply area according to the type of the power equipment, and determining the weight values ​​of the different types of power equipment according to the line loss proportion.

6. The method for dynamic evaluation of line loss index in power supply area according to claim 1 is characterized in that: The method for determining the line loss impact value of the power supply radius of the power supply area is: S3.1 Determine the line loss impact value of the high line loss users in the power supply area according to the load proportion, power supply radius and number of the high line loss users; S3.2 determines whether the load proportion of the low line loss users is less than the preset load proportion, if so, proceeds to step S3.3, if not, proceeds to step S3.4; S3.3 determines whether the number of the low line loss users is less than the preset number limit value, if so, the line loss impact value of the power supply radius of the power supply area is determined by the line loss impact value of the high line loss users in the power supply area, if not, proceeds to the next step; S3.4 Determine the line loss impact value of low line loss users in the power supply area through the load proportion, power supply radius and number of the low line loss users, determine the high load users among the high line loss users through the power load of the high line loss users, and determine the line loss impact value of the power supply radius of the power supply area through the line loss impact values ​​of the high line loss users, the line loss impact values ​​of the low line loss users, the power supply radius of the power supply area, the number of high load users and the power supply radius.

7. A dynamic evaluation system for line loss index in power supply area, characterized in that: A method for dynamically evaluating line loss indicators in a power supply area according to any one of claims 1 to 6 is adopted, specifically comprising: a basic line loss indicator determination module, a power equipment evaluation module, a line loss user evaluation module and a line loss indicator determination module; The basic line loss index determination module is responsible for obtaining the quantity ratio and load ratio of different types of power users in the power supply area, and determining the basic line loss index of the power supply area in combination with the power load of the power supply area; The power equipment evaluation module is responsible for determining old power equipment according to the operating years of the power equipment in the power supply area, and determining the line loss impact value of the power equipment in the power supply area through the data of the old power equipment in the power supply area and the operating load of the old power equipment; The line loss user evaluation module is responsible for determining the power supply radius of different power users in the power supply area, and dividing the power users into high line loss users and low line loss users at least according to the power supply radius and the power supply voltage level, and determining the line loss impact value of the power supply radius of the power supply area according to the user data of the high line loss users and the low line loss users; The line loss index determination module is responsible for determining the line loss index of the power supply substation according to the line loss impact value of the power supply radius of the power supply substation, the line loss impact value of the power equipment and the basic line loss index.

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