Method and system for measuring and calculating influence of distributed power supply access on power distribution network line loss

Abstract

The invention provides a method and system for measuring and calculating the influence of distributed power supply access on power distribution network line loss, and relates to the technical field of power distribution network loss analysis, and the method comprises the steps: obtaining the data of the influence of the distributed power supply access on the power distribution network line loss; and based on the optimization algorithm and the data of the influence of the distributed power supply access on the power distribution network line loss, solving the calculation model of the influence of the distributed power supply access on the power distribution network line loss considering the inverse power transmission factor, and obtaining an evaluation result of the influence of the distributed power supply access on the power distribution network line loss. By considering the reverse power transmission characteristic of the distributed power supply, the influence of the access of the distributed power supply on the line loss of the power distribution network can be accurately calculated, and a scientific decision basis is provided for a planner and a manager of a power system.

Description

Technical Field

[0001] The present invention belongs to the technical field of distribution network loss analysis, and specifically relates to a method and system for calculating the impact of distributed power access on distribution network line losses. Background Art

[0002] With the transformation of energy structure and the improvement of environmental awareness, the access of distributed power generation to distribution network has become an important trend in the development of power system. Distributed power generation mainly includes renewable energy generation forms such as wind power and solar power, which are clean, environmentally friendly, flexible and reliable. However, with the access of a large number of distributed power generation, the energy flow distribution of distribution network has changed significantly, which makes the traditional distribution network planning and operation management face new challenges. First, the rapid access of distributed power generation affects the line loss of distribution network, which first decreases and then increases. When the penetration rate of distributed power generation is low and it is mainly consumed on site, it helps to reduce the loss of power grid; when the penetration rate of distributed power generation is high and it cannot be consumed on site, the power is sent back to the upper power grid, and the line loss of distribution network increases. When the proportion of distributed power generation back-transmission power to the online power exceeds a certain range, the distributed back-transmission power will increase the loss of distribution network, resulting in an increase in the total loss of the power grid, and the distributed power generation may change from a loss reduction factor to a loss increase factor. Second, the access of energy storage and multi-loads has a great effect on smoothing the reverse flow caused by the large-scale access of distributed power generation and reducing the loss of distribution network. Third, the access of distributed power generation changes the power flow direction of distribution network, making the energy flow in the distribution network more complicated. When the electric energy generated by distributed power sources exceeds the local load demand, the phenomenon of electric energy reverse transmission occurs, that is, the distributed power sources transmit electric energy to the distribution network. Electric energy reverse transmission not only increases the complexity of the distribution network, but also has a significant impact on the line loss of the distribution network. The access of distributed power sources also affects the line loss of the distribution network. The access of distributed power sources with different grid-connected voltage levels will cause the current distribution in the distribution network to change, thereby affecting the size of the line loss. At the same time, the power consumption and reverse transmission of distributed power sources will directly affect the power generated and reverse transmission, and thus affect the line loss of the distribution network.

[0003] The most common existing technology for solving the impact of distributed power access on the line loss of the distribution network is the line loss assessment method based on power flow calculation. By establishing a power flow calculation model for the distribution network and considering the impact of distributed power access on the power flow distribution, the size of the line loss is calculated; however, this method does not consider factors comprehensively enough and cannot accurately assess the impact of distributed power access on the line loss. Some other studies have proposed a line loss measurement method based on artificial intelligence, which uses historical data and machine learning algorithms to establish a prediction model to assess the impact of distributed power access on line loss; this method has certain advantages in dealing with complex problems, but its accuracy and stability need to be improved. Therefore, the evaluation results obtained by the existing technology when dealing with the impact of distributed power access on the line loss of the distribution network are not accurate enough and cannot truly reflect the impact of distributed power access on the line loss of the distribution network. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a method for the influence of distributed power access on the line loss of the distribution network, comprising:

[0005] Obtain data on the impact of distributed generation access on distribution network line losses;

[0006] Based on the optimization algorithm and the data on the impact of distributed generation access on the line loss of the distribution network, the measurement model of the impact of distributed generation access on the line loss of the distribution network considering the reverse power transmission factor is solved, and the evaluation results of the impact of distributed generation access on the line loss of the distribution network are obtained.

[0007] Preferably, the optimization algorithm and the calculation model of the impact of the distributed generation access on the distribution network line loss are solved to obtain the evaluation result of the impact of the distributed generation access on the distribution network line loss, including:

[0008] Based on the data of the impact of distributed generation access on the line loss of the distribution network, the initial calculation results of the impact of distributed generation access on the line loss of the distribution network are obtained by using the calculation model of the impact of distributed generation access on the line loss of the distribution network taking into account the reverse power transmission factor;

[0009] Based on the initial calculation results, the optimization algorithm is used to optimize the value of the reverse power transmission factor, and the optimized calculation model of the impact of distributed generation access on the distribution network line loss is obtained;

[0010] The optimized calculation model of the impact of distributed generation access on distribution network line loss is used to output the evaluation results of the impact of distributed generation access on distribution network line loss.

[0011] Preferably, the reverse power transmission factor includes the reverse power transmission amount and / or the reverse power transmission ratio.

[0012] Preferably, when the reverse power transmission factor includes the reverse power transmission amount, the process of constructing a calculation model for the impact of the distributed power generation access on the distribution network line loss considering the reverse power transmission factor includes:

[0013] According to the power consumption and corresponding

[0014] The product of the above voltage layer division loss rates is used to determine the expression for the power consumption reduction of the partition line loss.

[0015] According to the product of the reverse transmission quantity of each grid-connected voltage level and the voltage layer voltage division loss rate of the corresponding grid-connected voltage level, the expression of the reverse transmission loss quantity of the partition line loss is determined;

[0016] According to the expression of the power reduction of the line loss absorption in the partition area and the expression of the power increase of the line loss reverse transmission in the partition area, the expression of the influence of the access of the distributed generation on the line loss of the distribution network considering the reverse transmission power is determined;

[0017] According to the expression of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss and the partition line loss judgment strategy, the calculation model of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss is determined;

[0018] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the reverse power is as follows:

[0019] ΔA=(A′×a′%+B′×b′%)-(A×a%+B×b%);

[0020] The partition line loss judgment strategy is as follows:

[0021] When ΔA is greater than 0, the impact of distributed generation access on the line loss of distribution network partitions increases;

[0022] When ΔA is equal to 0, the impact of distributed generation access on the line loss of distribution network partitions remains unchanged;

[0023] When ΔA is less than 0, the impact of distributed generation access on the line loss of distribution network partitions is reduced;

[0024] A′ is the power consumption of 0.4KV grid-connected voltage level, a′% is the voltage layer voltage loss rate above 0.4KV grid-connected voltage level, B′ is the power consumption of 10KV grid-connected voltage level, b′% is the voltage layer voltage loss rate above 10KV grid-connected voltage level, A is the reverse transmission power of 0.4KV grid-connected voltage level, a% is the voltage layer voltage loss rate of 0.4KV grid-connected voltage level, B is the reverse transmission power of 10KV grid-connected voltage level, b% is the voltage layer voltage loss rate of 10KV grid-connected voltage level, ΔA is the calculation result of the impact of distributed power access on distribution network line loss considering the reverse transmission power.

[0025] Preferably, when the reverse power transmission factor includes the reverse power transmission amount ratio, the process of constructing a calculation model for the impact of distributed power generation access on distribution network line loss considering the reverse power transmission factor includes:

[0026] Determine the proportion expression of voltage division loss rate of each voltage layer above the grid-connected voltage level according to the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level;

[0027] Determine the reverse transmission quantity ratio expression of each grid-connected voltage level according to the reverse transmission quantity and the consumed quantity of each grid-connected voltage level;

[0028] According to the reverse power ratio expression of each grid-connected voltage level and the voltage layer voltage loss ratio expression above each grid-connected voltage level, the expression of the influence of the access of distributed generation on the line loss of the distribution network considering the reverse power ratio is determined;

[0029] According to the expression of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network and the voltage-dividing line loss judgment strategy, the calculation model of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network is determined;

[0030] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power is as follows:

[0031]

[0032] The strategy for judging the voltage division line loss is as follows:

[0033] When ΔQ is greater than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level increases;

[0034] When ΔQ is equal to 0, the influence of the voltage-dividing line loss of the grid-connected voltage level on the access of distributed generation remains unchanged;

[0035] When ΔQ is less than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level is reduced;

[0036] k is the proportion of reverse power transmission at the grid-connected voltage level, q′% is the voltage division loss rate of the voltage layer above the grid-connected voltage level, q% is the voltage division loss rate of the voltage layer at the grid-connected voltage level, and ΔQ is the calculation result of the impact of distributed generation access on the distribution network line loss considering the proportion of reverse power transmission.

[0037] Preferably, after obtaining the evaluation result of the impact of the access of distributed power sources on the line loss of the distribution network, the method further includes:

[0038] Output evaluation results to demonstrate the impact of distributed generation access on distribution network line losses.

[0039] Preferably, obtaining data on the impact of distributed power access on distribution network line losses includes:

[0040] Obtain initial data on the impact of distributed generation access on distribution network line losses;

[0041] The initial data is preprocessed to obtain data on the impact of distributed generation access on distribution network line losses.

[0042] Preferably, the initial data on the impact of the access of distributed power sources on the line loss of the distribution network includes one or more of the following: distribution network topology data, distributed power source data, historical operation data, and environmental meteorological data;

[0043] The distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers of the distribution network, distribution network parameter data, and distribution network operation status information;

[0044] The distributed power source data includes one or more of the following: the access location data, capacity data, type data, operation status data, and output power data of the distributed power source;

[0045] The historical operation data includes one or more of the following: historical load data of the distribution network, voltage and current data of the distribution network, and power factor of the distribution network;

[0046] Environmental meteorological data include one or more of the following: wind speed, wind direction, solar radiation, air temperature, and air humidity.

[0047] Preferably, preprocessing the initial data includes one or more of the following: data cleaning, data conversion, data standardization, feature extraction;

[0048] Data cleaning is used to remove duplicate, erroneous or abnormal data, fill in missing values ​​of the removed data, and smooth the data after filling in missing values ​​to reduce data noise;

[0049] Data conversion is used to convert or encode data format according to the requirements of the calculation model of the impact of distributed power access on distribution network line loss, so as to obtain data in a unified format;

[0050] Data standardization is used to standardize data to conform to specific distribution rules and obtain standardized data.

[0051] Feature extraction is used to extract feature data related to the impact of distributed generation access on distribution network line losses. The feature data includes one or more of the following: the grid-connected voltage level of the distributed generation, the voltage-dividing line loss rate value of each grid-connected voltage level, and the power consumption value of each grid-connected voltage level.

[0052] Based on the same inventive concept, the present invention also provides a system for measuring the impact of distributed power access on distribution network line loss, the system comprising: a data acquisition module, an evaluation result acquisition module;

[0053] A data acquisition module is used to obtain data on the impact of distributed power access on distribution network line losses;

[0054] The evaluation result acquisition module is used to solve the model of the impact of distributed power access on the distribution network line loss considering the reverse power transmission factor based on the optimization algorithm and the data of the impact of distributed power access on the distribution network line loss, and obtain the evaluation results of the impact of distributed power access on the distribution network line loss.

[0055] Preferably, the evaluation result acquisition module includes:

[0056] The initial calculation result acquisition submodule is used to obtain the initial calculation result of the influence of the distributed generation access on the distribution network line loss based on the data of the influence of the distributed generation access on the distribution network line loss and the calculation model of the influence of the distributed generation access on the distribution network line loss considering the reverse power transmission factor;

[0057] The calculation model optimization submodule is used to optimize the value of the reverse power transmission factor based on the initial calculation results by using an optimization algorithm to obtain an optimized calculation model for the impact of the access of distributed power sources on the line loss of the distribution network;

[0058] The evaluation result acquisition submodule is used to use the optimized calculation model of the impact of distributed power access on the distribution network line loss to output the evaluation result of the impact of distributed power access on the distribution network line loss.

[0059] Preferably, the reverse power transmission factor includes the reverse power transmission amount and / or the reverse power transmission ratio.

[0060] Preferably, the system further comprises a calculation model building submodule,

[0061] When the reverse power transmission factor includes the reverse power transmission amount, the calculation model construction submodule is specifically used for:

[0062] According to the product of the power consumption of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level, the expression of power consumption reduction of the sub-area line loss is determined;

[0063] According to the product of the reverse transmission quantity of each grid-connected voltage level and the voltage layer voltage division loss rate of the corresponding grid-connected voltage level, the expression of the reverse transmission loss quantity of the partition line loss is determined;

[0064] According to the expression of the power reduction of the line loss absorption in the partition area and the expression of the power increase of the line loss reverse transmission in the partition area, the expression of the influence of the access of the distributed generation on the line loss of the distribution network considering the reverse transmission power is determined;

[0065] According to the expression of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss and the partition line loss judgment strategy, the calculation model of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss is determined;

[0066] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the reverse power is as follows:

[0067] ΔA=(A′×a′%+B′×b′%)-(A×a%+B×b%);

[0068] The partition line loss judgment strategy is as follows:

[0069] When ΔA is greater than 0, the impact of distributed generation access on the line loss of distribution network partitions increases;

[0070] When ΔA is equal to 0, the impact of distributed generation access on the line loss of distribution network partitions remains unchanged;

[0071] When ΔA is less than 0, the impact of distributed generation access on the line loss of distribution network partitions is reduced;

[0072] A′ is the power consumption of 0.4KV grid-connected voltage level, a′% is the voltage layer voltage loss rate above 0.4KV grid-connected voltage level, B′ is the power consumption of 10KV grid-connected voltage level, b′% is the voltage layer voltage loss rate above 10KV grid-connected voltage level, A is the reverse transmission power of 0.4KV grid-connected voltage level, a% is the voltage layer voltage loss rate of 0.4KV grid-connected voltage level, B is the reverse transmission power of 10KV grid-connected voltage level, b% is the voltage layer voltage loss rate of 10KV grid-connected voltage level, ΔA is the calculation result of the impact of distributed power access on distribution network line loss considering the reverse transmission power.

[0073] Preferably, when the reverse power transmission factor includes the reverse power transmission amount ratio, the calculation model construction submodule is specifically used for:

[0074] Determine the proportion expression of voltage division loss rate of each voltage layer above the grid-connected voltage level according to the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level;

[0075] Determine the reverse transmission quantity ratio expression of each grid-connected voltage level according to the reverse transmission quantity and the consumed quantity of each grid-connected voltage level;

[0076] According to the reverse power ratio expression of each grid-connected voltage level and the voltage layer voltage loss ratio expression above each grid-connected voltage level, the expression of the influence of the access of distributed generation on the line loss of the distribution network considering the reverse power ratio is determined;

[0077] According to the expression of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network and the voltage-dividing line loss judgment strategy, the calculation model of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network is determined;

[0078] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power is as follows:

[0079]

[0080] The strategy for judging the voltage division line loss is as follows:

[0081] When ΔQ is greater than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level increases;

[0082] When ΔQ is equal to 0, the influence of the voltage-dividing line loss of the grid-connected voltage level on the access of distributed generation remains unchanged;

[0083] When ΔQ is less than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level is reduced;

[0084] k is the proportion of reverse power transmission at the grid-connected voltage level, q′% is the voltage division loss rate of the voltage layer above the grid-connected voltage level, q% is the voltage division loss rate of the voltage layer at the grid-connected voltage level, and ΔQ is the calculation result of the impact of distributed generation access on the distribution network line loss considering the proportion of reverse power transmission.

[0085] Preferably, the system further comprises:

[0086] The evaluation result output module is used to output the evaluation results and display the impact of distributed power access on the line loss of the distribution network.

[0087] Preferably, the data acquisition module includes:

[0088] The initial data acquisition submodule is used to obtain the initial data on the impact of the access of distributed power sources on the line loss of the distribution network;

[0089] The data preprocessing submodule is used to preprocess the initial data to obtain data on the impact of distributed power access on distribution network line losses.

[0090] Preferably, the initial data acquired by the initial data acquisition submodule includes one or more of the following: distribution network topology data, distributed power source data, historical operation data, and environmental meteorological data;

[0091] The distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers of the distribution network, distribution network parameter data, and distribution network operation status information;

[0092] The distributed power source data includes one or more of the following: the access location data, capacity data, type data, operation status data, and output power data of the distributed power source;

[0093] The historical operation data includes one or more of the following: historical load data of the distribution network, voltage and current data of the distribution network, and power factor of the distribution network;

[0094] Environmental meteorological data include one or more of the following: wind speed, wind direction, solar radiation, air temperature, and air humidity.

[0095] Preferably, the data preprocessing submodule preprocesses the initial data including one or more of the following: data cleaning, data conversion, data standardization, feature extraction;

[0096] Data cleaning is used to remove duplicate, erroneous or abnormal data, fill in missing values ​​of the removed data, and smooth the data after filling in missing values ​​to reduce data noise;

[0097] Data conversion is used to convert or encode data format according to the requirements of the calculation model of the impact of distributed power access on distribution network line loss, so as to obtain data in a unified format;

[0098] Data standardization is used to standardize data to conform to specific distribution rules and obtain standardized data.

[0099] Feature extraction is used to extract feature data related to the impact of distributed generation access on distribution network line losses. The feature data includes one or more of the following: the grid-connected voltage level of the distributed generation, the voltage-dividing line loss rate value of each grid-connected voltage level, and the power consumption value of each grid-connected voltage level.

[0100] Based on the same inventive concept, the present invention also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0101] The memory is used to store one or more programs;

[0102] When the one or more programs are executed by the at least one processor, the aforementioned method for calculating the impact of the access of distributed power sources on the line loss of the distribution network is implemented.

[0103] Based on the same inventive concept, the present invention also provides a readable storage medium having an execution program stored thereon. When the execution program is executed, the method for calculating the impact of the access of distributed power sources on the line loss of the distribution network as described above is implemented.

[0104] Compared with the closest prior art, the present invention has the following beneficial effects:

[0105] The present invention provides a method for measuring the impact of distributed power access on distribution network line losses, including: obtaining data on the impact of distributed power access on distribution network line losses; solving a calculation model for the impact of distributed power access on distribution network line losses that takes into account a reverse power transmission factor based on an optimization algorithm and the data on the impact of distributed power access on distribution network line losses, and obtaining an evaluation result of the impact of distributed power access on distribution network line losses. By considering the reverse power transmission characteristics of distributed power sources, the present invention can accurately calculate the impact of distributed power access on distribution network line losses, providing a scientific decision-making basis for power system planners and managers. BRIEF DESCRIPTION OF THE DRAWINGS

[0106] Figure 1 A flow chart of a method for calculating the impact of distributed power access on distribution network line losses is provided for the present invention;

[0107] Figure 2 A flow chart for calculating the impact of the distributed power supply access provided by the present invention on the line loss of the distribution network;

[0108] Figure 3 A specific example diagram of the method for calculating the impact of distributed power access on distribution network line loss provided by the present invention;

[0109] Figure 4 A structural diagram of a system for measuring the impact of distributed power access on distribution network line losses provided by the present invention;

[0110] Figure 5 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0111] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0112] Embodiment 1:

[0113] The present invention provides a method for calculating the impact of distributed power access on distribution network line loss, specifically, Figure 1 A flow chart of a method for calculating the impact of distributed power access on distribution network line loss provided by an embodiment of the present invention includes the following steps as shown in the figure:

[0114] S1: Obtain data on the impact of distributed generation access on distribution network line losses;

[0115] S2: Based on the optimization algorithm and the data on the impact of distributed power generation access on the distribution network line loss, the measurement model of the impact of distributed power generation access on the distribution network line loss considering the reverse power transmission factor is solved to obtain the evaluation results of the impact of distributed power generation access on the distribution network line loss.

[0116] The present invention takes into account the reverse power transmission characteristics of distributed power sources, accurately calculates the impact of distributed power source access on distribution network line losses, and provides a scientific decision-making basis for power system planners and managers.

[0117] Data collection is the first step to obtain the information required for analyzing the impact of distributed generation access on distribution network line losses. In one implementation, in order to accurately evaluate the impact of distributed generation access on distribution network line losses, the collected data can be preprocessed. For example, the data obtained in S1 on the impact of distributed generation access on distribution network line losses include:

[0118] Obtain initial data on the impact of distributed generation access on distribution network line losses;

[0119] The initial data is preprocessed to obtain data on the impact of distributed generation access on distribution network line losses.

[0120] The initial data of the impact of distributed power generation access on the line loss of the distribution network is used as the first step to analyze the information required for the impact of distributed power generation access on the line loss of the distribution network. According to the requirements of the present invention, the initial data obtained includes one or more of the following: distribution network topology data, distributed power data, historical operation data, and environmental meteorological data. The way to obtain the initial data can be carried out in a variety of ways, such as on-site measurement, equipment monitoring, database query, etc.

[0121] It can be understood that the initial data obtained is not limited to the data listed above, and the method of obtaining the initial data is not limited here. Any data related to the impact of distributed power supply access on distribution network line losses and the method of obtaining data are within the scope of protection requested by the present invention.

[0122] The distribution network topology data includes the connection relationship data between the nodes, lines, transformers and other equipment of the distribution network, the distribution network parameter data and the distribution network operation status information. The distribution network topology data is the basis for building the distribution network power flow calculation model.

[0123] Distributed power data, including the access location data, capacity data, type data (such as wind power, solar power, etc.), operation status data, and output power data of distributed power. In particular, data on the reverse power transmission capability and operation status of distributed power are key data for evaluating its impact on distribution network line losses.

[0124] Historical operation data, including historical load data of the distribution network, voltage and current data of the distribution network, and power factor of the distribution network. Historical operation data helps to understand the operation rules of the distribution network and provide a basis for model construction and optimization.

[0125] Environmental meteorological data, including wind speed, wind direction, solar radiation, air temperature, and air humidity. For distributed power sources generated by renewable energy, their power generation is often affected by environmental and meteorological conditions. Collecting relevant meteorological data helps to more accurately evaluate the output capacity of distributed power sources.

[0126] After obtaining the initial data on the impact of distributed generation access on distribution network line losses, in order to ensure the accuracy and completeness of the data, the acquired initial data can be preprocessed. Through data preprocessing, a high-quality, standardized data set can be obtained, providing reliable data support for subsequent model construction and optimization.

[0127] Data preprocessing is the process of cleaning, converting and standardizing the acquired initial data to make it meet the requirements of model analysis and calculation. Based on the requirements of the present invention, the preprocessing of the initial data includes one or more of the following: data cleaning, data conversion, data standardization, feature extraction;

[0128] Data cleaning is used to remove duplicate, erroneous or abnormal data, fill missing values, and smooth the data after missing values ​​are filled to reduce noise. For example, abnormal voltage or current data in the distribution network can be identified and corrected. By verifying and cleaning the collected data, the accuracy and integrity of the data can be ensured.

[0129] Data conversion is used to convert or encode data formats according to the requirements of the calculation model of the impact of distributed power generation access on distribution network line losses. For example, data in different units or dimensions are converted into unified standard units to facilitate calculation and analysis.

[0130] Data standardization is used to standardize data so that it conforms to normal distribution or a specific distribution law, which facilitates subsequent model training and calculation.

[0131] Feature extraction is used to extract feature data related to the impact of distributed generation access on distribution network line loss from the data after the above processing as input for model analysis. The feature data includes the grid-connected voltage level of the distributed generation, the voltage-dividing line loss rate value of each grid-connected voltage level, the power consumption value of each grid-connected voltage level, and the reverse power transmission characteristics.

[0132] It is understandable that the methods for preprocessing the initial data are not limited to the above methods, and the preprocessing of different initial data is not completely performed one by one according to all the methods listed above. Several preprocessing methods can be selected according to needs, which are not limited here.

[0133] After obtaining the data on the impact of distributed generation access on the line loss of the distribution network through S1, S2 solves the calculation model of the impact of distributed generation access on the line loss of the distribution network considering the reverse power transmission factor based on the optimization algorithm and the data on the impact of distributed generation access on the line loss of the distribution network, and obtains the evaluation results of the impact of distributed generation access on the line loss of the distribution network, including:

[0134] Based on the data of the impact of distributed generation access on the line loss of the distribution network, the initial calculation results of the impact of distributed generation access on the line loss of the distribution network are obtained by using the calculation model of the impact of distributed generation access on the line loss of the distribution network taking into account the reverse power transmission factor;

[0135] Based on the initial calculation results, the optimization algorithm is used to optimize the value of the reverse power transmission factor, and the optimized calculation model of the impact of distributed generation access on the distribution network line loss is obtained;

[0136] The optimized calculation model of the impact of distributed generation access on distribution network line loss is used to output the evaluation results of the impact of distributed generation access on distribution network line loss.

[0137] Specifically, the data on the impact of distributed power generation access on the distribution network line loss is substituted into the calculation model of the impact of distributed power generation access on the distribution network line loss that takes into account the reverse power transmission factor, and the initial calculation results of the impact of distributed power generation access on the distribution network line loss are obtained; then, based on the initial calculation results, the value of the reverse power transmission factor is optimized using the particle swarm optimization algorithm to obtain the optimized calculation model of the impact of distributed power generation access on the distribution network line loss; finally, the calculation model of the impact of distributed power generation access on the distribution network line loss is used to output the evaluation results of the impact of distributed power generation access on the distribution network line loss.

[0138] After outputting the evaluation results, a visual interface can also be provided to display the evaluation results in the form of charts, so that users can intuitively understand the impact of distributed power access on line losses.

[0139] The following is a detailed explanation of the pre-constructed calculation model for the impact of distributed generation access on distribution network line losses taking into account the reverse power transmission factor, as well as S2's data on the impact of distributed generation access on distribution network line losses based on the optimization algorithm and distributed generation access. The calculation model for the impact of distributed generation access on distribution network line losses taking into account the reverse power transmission factor is solved to obtain the evaluation results of the impact of distributed generation access on distribution network line losses.

[0140] In order to solve the problem that the evaluation results obtained in the prior art when dealing with the impact of distributed power generation access on the line loss of the distribution network are not accurate enough and cannot truly reflect the line loss situation of the distribution network after the distributed power generation access is connected, the present invention comprehensively considers the grid-connected voltage level, the amount of power consumed and the reverse power transmission characteristics of the distributed power source when calculating the impact of the distributed power generation access on the distribution network, and introduces a reverse power transmission factor to quantify the reverse power transmission capability of the distributed power source and its impact on the line loss of the distribution network.

[0141] The on-site consumption of distributed electricity has a loss-reducing effect on the power grid. The consumption of electricity can reduce the transmission of electricity in the power grid above the same level, thereby reducing the loss of electricity. The reverse transmission of distributed electricity has both loss-reducing and loss-increasing effects on the power grid. On the one hand, the transmission of excess electricity to the Internet will increase the loss of electricity at the voltage level, which has a loss-increasing effect on the power grid at the same voltage level; on the other hand, if the excess electricity is reversed to the upper-level power grid and can be consumed in the upper-level power grid, it can reduce the transmission of electricity above the upper-level power grid, which has a loss-reducing effect. Therefore, when the penetration rate of distributed power sources is low, distributed electricity can be consumed on-site, which helps to reduce power grid losses; as the penetration rate of distributed power sources gradually increases, when distributed electricity cannot be consumed on-site, electricity is reversed to the upper-level power grid, and power grid losses may increase. Clarifying the impact of loss reduction or loss increase can provide a scientific decision-making basis for power system planners and managers.

[0142] The reverse power transmission factor in the present invention includes the reverse power transmission amount and / or the reverse power transmission ratio.

[0143] When the reverse power transmission factor includes the reverse power transmission amount, the construction process of the calculation model for the impact of distributed generation access on the distribution network line loss considering the reverse power transmission factor includes:

[0144] According to the product of the power consumption of each grid-connected voltage level and the voltage layer division loss rate above the corresponding grid-connected voltage level, the expression for the power consumption and reduction of the partitioned line loss is determined; according to the product of the reverse transmission power of each grid-connected voltage level and the voltage layer division loss rate of the corresponding grid-connected voltage level, the expression for the power increase and loss of the partitioned line loss reverse transmission is determined; by calculating the expression for the power consumption and reduction of the partitioned line loss and the expression for the power increase and loss of the partitioned line loss reverse transmission, the expression for the influence of the access of distributed power sources considering the reverse transmission power on the line loss of the distribution network is determined; according to the expression for the influence of the access of distributed power sources considering the reverse transmission power on the line loss of the distribution network and the partitioned line loss judgment strategy, the calculation model for the influence of the access of distributed power sources considering the reverse transmission power on the line loss of the distribution network is determined.

[0145] That is, add the product of the power consumption of each grid-connected voltage level and the voltage layer voltage loss rate above the corresponding grid-connected voltage level to obtain the expression of the power consumption and loss reduction of the partitioned line loss of all grid-connected voltage levels; add the product of the reverse transmission power of each grid-connected voltage level and the voltage layer voltage loss rate of the corresponding grid-connected voltage level to obtain the expression of the power reverse transmission increase and loss of the partitioned line loss of all grid-connected voltage levels; subtract the expression of the power consumption and loss reduction of the partitioned line loss of all grid-connected voltage levels from the expression of the power reverse transmission increase and loss of the partitioned line loss of all grid-connected voltage levels to obtain the expression of the impact of the access of distributed power sources on the line loss of the distribution network considering the reverse transmission power, and determine the judgment strategy of the partitioned line loss at the same time. According to the expression and the judgment strategy of the partitioned line loss, determine the calculation model of the impact of the access of distributed power sources on the line loss of the distribution network considering the reverse transmission power.

[0146] Table 1 is an example of the factors affecting the line loss of the distribution network by the distributed generation and their data representation. Table 1 only considers the grid-connected voltage levels of 0.4KV and 10KV. In actual needs, other grid-connected voltage levels, such as 35KV and above, can also be considered. This is only an example for illustration and does not constitute a limitation.

[0147]

[0148]

[0149] Table 1

[0150] Table 1 covers the grid-connected voltage level, voltage-dividing line loss rate, reverse transmission amount and absorbed amount. An expression for the impact of distributed generation access on distribution network line loss considering reverse transmission amount is constructed through a variety of influencing factors.

[0151] The calculation model of the impact of distributed generation access on distribution network line loss considering the reverse power transmission includes two parts, namely, the expression of the impact of distributed generation access on distribution network line loss considering the reverse power transmission and the partition line loss judgment strategy.

[0152] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the reverse power is as follows:

[0153] ΔA=(A′×a′%+B′×b′%)-(A×a%+B×b%);

[0154] The partition line loss judgment strategy is as follows:

[0155] When ΔA is greater than 0, the impact of distributed generation access on the line loss of distribution network partitions increases;

[0156] When ΔA is equal to 0, the impact of distributed generation access on the line loss of distribution network partitions remains unchanged;

[0157] When ΔA is less than 0, the impact of distributed generation access on the line loss of distribution network partitions is reduced;

[0158] A′ is the power consumption of 0.4KV grid-connected voltage level, a′% is the voltage layer voltage loss rate above 0.4KV grid-connected voltage level, B′ is the power consumption of 10KV grid-connected voltage level, b′% is the voltage layer voltage loss rate above 10KV grid-connected voltage level, A is the reverse transmission power of 0.4KV grid-connected voltage level, a% is the voltage layer voltage loss rate of 0.4KV grid-connected voltage level, B is the reverse transmission power of 10KV grid-connected voltage level, b% is the voltage layer voltage loss rate of 10KV grid-connected voltage level, ΔA is the calculation result of the impact of distributed power access on distribution network line loss considering the reverse transmission power.

[0159] When the reverse power transmission factor includes the reverse power transmission ratio, the construction process of the calculation model for the impact of distributed generation access on distribution network line loss considering the reverse power transmission factor includes:

[0160] Determine the proportion expression of voltage division loss rate of each voltage layer above the grid-connected voltage level according to the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level;

[0161] Determine the reverse transmission quantity ratio expression of each grid-connected voltage level according to the reverse transmission quantity and the consumed quantity of each grid-connected voltage level;

[0162] According to the reverse power ratio expression of each grid-connected voltage level and the voltage layer voltage loss ratio expression above each grid-connected voltage level, the expression of the influence of the access of distributed generation on the line loss of the distribution network considering the reverse power ratio is determined;

[0163] According to the expression of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network and the voltage-dividing line loss judgment strategy, the calculation model of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network is determined;

[0164] That is, according to the proportion of the voltage-dividing loss rate of each voltage layer above each grid-connected voltage level in the sum of the voltage-dividing loss rate of each voltage layer above each grid-connected voltage level and the voltage-dividing loss rate of the grid-connected voltage level, the expression of the proportion of the voltage-dividing loss rate of each voltage layer above the grid-connected voltage level is determined; according to the reverse transmission amount and the consumed amount of each grid-connected voltage level, the expression of the proportion of the voltage-dividing loss rate of each voltage layer above the grid-connected voltage level is determined; the expression of the proportion of the voltage-dividing loss rate of each voltage layer above the grid-connected voltage level is subtracted from the expression of the proportion of the voltage-dividing loss rate of each voltage layer above the grid-connected voltage level to obtain the expression of the influence of the distributed power generation access on the distribution network line loss considering the proportion of the reverse transmission amount, and the voltage-dividing line loss judgment strategy is obtained at the same time. According to the expression of the influence of the distributed power generation access on the distribution network line loss considering the proportion of the reverse transmission amount and the voltage-dividing line loss judgment strategy, the calculation model of the influence of the distributed power generation access with the proportion of the reverse transmission amount on the distribution network line loss is determined.

[0165] The calculation model of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power transmission includes two parts, namely, the expression of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power transmission and the voltage-dividing line loss judgment strategy.

[0166] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power is as follows:

[0167]

[0168] The voltage division line loss judgment strategy is as follows:

[0169] When ΔQ is greater than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level increases;

[0170] When ΔQ is equal to 0, the influence of the voltage-dividing line loss of the grid-connected voltage level on the access of distributed generation remains unchanged;

[0171] When ΔQ is less than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level is reduced;

[0172] k is the proportion of reverse power transmission at the grid-connected voltage level, q′% is the voltage division loss rate of the voltage layer above the grid-connected voltage level, q% is the voltage division loss rate of the voltage layer at the grid-connected voltage level, and ΔQ is the calculation result of the impact of distributed generation access on the distribution network line loss considering the proportion of reverse power transmission.

[0173] When the grid-connected voltage level is 0.4KV, the proportion of reverse power is k 0.4 , the expression of reverse power ratio is

[0174]

[0175] Using the example in Table 1,

[0176] The impact of distributed generation access on distribution network line loss ΔQ considering the proportion of reverse power transmission 0.4 The expression is

[0177] The strategy for judging the voltage division line loss is as follows:

[0178] When ΔQ 0.4 When it is greater than 0, the impact of distributed power access on the 0.4KV voltage-dividing line loss increases;

[0179] When ΔQ 0.4 When it is equal to 0, the influence of distributed power access on the 0.4KV voltage-dividing line loss remains unchanged;

[0180] When ΔQ 0.4 When it is less than 0, the impact of distributed power access on the 0.4KV voltage-dividing line loss is reduced.

[0181] When the grid-connected voltage level is 10KV, the proportion of reverse power is k 10 ,

[0182] The total amount of electricity online of 10kv distributed power sources can be the sum of the amount of electricity online of 10kv distributed power sources and the amount of electricity reversed from 0.4kv distributed power sources to 10kv, that is, the sum of the amount of electricity generated at this voltage level and the amount of electricity reversed from the low voltage level to this voltage level; the total amount of electricity online of 10kv distributed power sources can also be the sum of the amount of electricity consumed by 10kv distributed power sources and the amount of electricity reversed from 10kv distributed power sources to a higher voltage level, that is, the sum of the amount of electricity consumed at this voltage level and the amount of electricity reversed to a higher voltage level.

[0183] Specifically, there are two forms of expression for the total online power of 10kv distributed power sources. One is the total online power of 10kv distributed power sources = the online power of 10kv distributed power sources + the reverse power of 0.4kv distributed power sources. The other is the total online power of 10kv distributed power sources = the power consumed by 10kv distributed power sources + the reverse power of 10kv distributed power sources.

[0184] The expression of reverse power ratio is:

[0185] Using the example in Table 1,

[0186] The impact of distributed generation access on distribution network line loss ΔQ considering the proportion of reverse power transmission 10 The expression is

[0187] The strategy for judging the voltage division line loss is as follows:

[0188] When ΔQ 10 When it is greater than 0, the impact of distributed power access on 10KV voltage division line loss increases;

[0189] When ΔQ 10 When it is equal to 0, the influence of distributed power access on the 10KV voltage-dividing line loss remains unchanged;

[0190] When ΔQ 10 When it is less than 0, the impact of distributed power access on 10KV voltage division line loss is reduced.

[0191] After constructing the calculation model of the impact of distributed power generation access on the line loss of the distribution network considering the reverse power transmission factor in the above way, the grid-connected voltage level, the voltage layer voltage loss rate above the grid-connected voltage level, the voltage layer voltage loss rate of the grid-connected voltage level, the power consumption and other data of the distributed power generation access on the line loss of the distribution network obtained by S1 are substituted into the calculation model of the impact of distributed power generation access on the line loss of the distribution network considering the reverse power transmission factor, and the expression of the impact of the reverse power transmission factor and the distributed power generation access on the line loss of the distribution network is obtained as the initial calculation result. Further, based on the initial calculation results, the advanced particle swarm optimization algorithm is used to adjust the value of the reverse power transmission factor to simulate the change of the line loss of the distribution network after different distributed power sources are connected, and the calculation model of the impact of the distributed power generation access on the line loss of the distribution network after the optimized distributed power generation access is used to output the evaluation results of the impact of the distributed power generation access on the line loss of the distribution network. Through iterative optimization, the loss of distributed power generation on the line loss of the distribution network is reduced, and the energy utilization efficiency is improved. At the same time, the constraints of the distribution network are considered to ensure that the solution meets the actual operation requirements and is suitable for the evaluation of large-scale distribution networks.

[0192] The evaluation results of the impact of distributed power access on the line loss of the distribution network include indicators such as line loss rate and reverse transmission amount. The present invention provides a visual interface to display the evaluation results in the form of charts, so that users can intuitively understand the impact of distributed power access on the line loss of the distribution network.

[0193] like Figure 2 As shown, it is a flow chart for calculating the influence of distributed power access on the line loss of the distribution network provided by the present invention. First, data on the influence of distributed power access on the line loss of the distribution network is collected, and the collected data includes but is not limited to power consumption data, load data, archive data, topology data, and meteorological data. Then, the collected data is preprocessed, and the preprocessing method is not limited to data cleaning, data conversion, data standardization, feature extraction and selection. Then, a calculation model for the influence of distributed power access on the line loss of the distribution network is established, and the model is further optimized according to the data such as the voltage-dividing line loss rate, the reverse transmission amount, and the consumption amount, and the model is output. Then, the model is optimized according to the model output result and the algorithm optimization iteration, and the evaluation result is output according to the optimized model, and finally the result is displayed in a visual form.

[0194] When dealing with the issue of the impact of distributed power access on the line loss of the distribution network, the existing technology fails to fully consider the reverse power characteristics of the distributed power. Many existing technologies or models often ignore the reverse power characteristics of distributed power when evaluating the impact of distributed power on the line loss of the distribution network, which leads to inaccurate evaluation results and cannot truly reflect the line loss of the distribution network after the distributed power is connected. At the same time, the existing technology has the problem of insufficient calculation accuracy and stability. Specifically, some models based on traditional calculation methods may face the problem of insufficient calculation accuracy when dealing with complex distributed power access situations. In addition, due to the large number of uncertainties brought about by the access of distributed power, the existing technology may find it difficult to ensure the stability of the calculation, thereby affecting the reliability of the evaluation results. Therefore, it is necessary to study a more accurate, stable, flexible measurement model that takes into account the overall operation of the distribution network.

[0195] The present invention discloses a detailed design and process for constructing a calculation model for the influence of distributed power sources on the line loss of distribution networks, covering key steps such as the algorithm iteration process and calculation rules. First, the model comprehensively considers the reverse power transmission characteristics of distributed power sources, and can accurately evaluate its influence on the line loss of distribution networks; secondly, the model considers factors such as the grid-connected voltage level and the reverse power transmission factor of distributed power sources, so that the evaluation results are more comprehensive and accurate; finally, the model has high calculation efficiency and stability, and can adapt to the evaluation needs of large-scale distribution networks. The model can achieve the following effects: accurately evaluate the influence of distributed power access on line loss: the model can comprehensively consider the reverse power transmission characteristics of distributed power sources, and accurately calculate its influence on the line loss of distribution networks. This helps power system planners and managers to better understand the loss of the power grid after the distributed power sources are connected, so as to formulate reasonable operation strategies and optimization plans. Adapt to the development trend of new energy: with the rapid development of renewable energy, the proportion of distributed power sources connected to the power grid is increasing. The model can adapt to this development trend, provide a scientific evaluation method for the access of new energy to the power grid, and promote the widespread application of new energy.

[0196] Specifically, the present invention comprehensively considers the grid-connected voltage level, power consumption and reverse power transmission characteristics of distributed power sources, introduces a reverse power transmission factor, and is used to quantify the reverse power transmission capability of distributed power sources and its impact on the line loss of the distribution network; by adjusting the value of the reverse power transmission factor, the line loss changes under different distributed power source access conditions can be simulated, and iterative optimization can be performed to make the model more suitable for measuring the impact of reverse distributed power source access on line loss, clarify the impact of loss reduction or loss increase, calculate the line loss impact value, etc., thereby improving the calculation efficiency, being suitable for the evaluation of large-scale distribution networks, and ensuring that the solution results meet the actual operation requirements.

[0197] The present invention significantly improves the accuracy of the assessment of the impact of distributed power generation access on the line loss of the distribution network. By constructing a measurement model that fully considers the reverse power transmission characteristics of distributed power sources, it is possible to more accurately calculate the line loss of the distribution network after the distributed power generation access is connected, and to clarify whether the distributed power generation has a loss-reducing or loss-increasing impact on the power grid. Clarifying the impact of loss reduction or loss increase can provide a scientific decision-making basis for power system planners and managers.

[0198] The present invention also helps to promote the widespread application and development of new energy. By providing a more accurate evaluation method for the impact of distributed power access on distribution network line loss, it helps to eliminate people's concerns about the negative impact of new energy access to the power grid, thereby promoting the widespread application and development of new energy and promoting sustainable development. By optimizing the distributed power access solution, the impact of distribution network line loss is reduced, energy utilization efficiency is improved, and sustainable development is promoted.

[0199] From the perspective of economic and social benefits, the present invention also has significant advantages. By reducing the power loss of distributed photovoltaic power grid lines and improving energy utilization efficiency, it helps to reduce the operating cost of the power system and improve economic benefits. At the same time, promoting the application and development of new energy will also help improve environmental quality and increase social benefits.

[0200] like Figure 3 As shown, it is a specific example diagram of the method for measuring the impact of distributed power access on distribution network line loss provided by the present invention.

[0201] Taking a certain local power grid as an example, the grid-connected electricity in the substation area is 15.533 billion kWh, the local power consumption is 7.828 billion kWh (50.4%), and the substation area sends back 7.706 billion kWh (49.6%) to the 10kV system, of which 1.845 billion kilowatts continue to send back to higher voltage levels (35, 110 kV), accounting for 11.9% of the grid-connected electricity in the substation area. The impact of distributed power generation access on line loss is calculated based on each voltage level: the impact of distributed power is 440.8 million kilowatts of loss reduction, 276.4 million kWh of loss increase, a total loss reduction of 164.4 million kWh, and the reduction of line loss of the entire network by 0.074 percentage points.

[0202] Among them, the amount of electricity consumed = the amount of electricity connected to the grid - the amount of electricity sent back.

[0203] The increase and loss of electricity caused by reverse transmission = the reverse transmission amount of this voltage layer × the grid-connected voltage level voltage layer voltage division loss rate,

[0204] The power loss caused by consumption = the power consumption of this voltage layer × the voltage division loss rate of the voltage layer above the grid-connected voltage level.

[0205] Embodiment 2:

[0206] Based on the same inventive concept, the present invention also provides a system 400 for calculating the impact of distributed power access on distribution network line loss. The system structure is as follows: Figure 4 As shown, the system includes: a data acquisition module 401, an evaluation result acquisition module 402;

[0207] The data acquisition module 401 is used to acquire data on the impact of the access of distributed power sources on the line loss of the distribution network;

[0208] The evaluation result acquisition module 402 is used to solve the model of the impact of distributed power access on the distribution network line loss considering the reverse power transmission factor based on the optimization algorithm and the data of the impact of distributed power access on the distribution network line loss, and obtain the evaluation result of the impact of distributed power access on the distribution network line loss.

[0209] Preferably, the evaluation result acquisition module includes:

[0210] The initial calculation result acquisition submodule is used to obtain the initial calculation result of the influence of the distributed generation access on the distribution network line loss based on the data of the influence of the distributed generation access on the distribution network line loss and the calculation model of the influence of the distributed generation access on the distribution network line loss considering the reverse power transmission factor;

[0211] The calculation model optimization submodule is used to optimize the value of the reverse power transmission factor based on the initial calculation results by using an optimization algorithm to obtain an optimized calculation model for the impact of the access of distributed power sources on the line loss of the distribution network;

[0212] The evaluation result acquisition submodule is used to use the optimized calculation model of the impact of distributed power access on the distribution network line loss to output the evaluation result of the impact of distributed power access on the distribution network line loss.

[0213] Preferably, the reverse power transmission factor includes the reverse power transmission amount and / or the reverse power transmission ratio.

[0214] Preferably, the system further comprises a calculation model building submodule,

[0215] When the reverse power transmission factor includes the reverse power transmission amount, the calculation model construction submodule is specifically used for:

[0216] According to the product of the power consumption of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level, the expression of power consumption reduction of the sub-area line loss is determined;

[0217] According to the product of the reverse transmission quantity of each grid-connected voltage level and the voltage layer voltage division loss rate of the corresponding grid-connected voltage level, the expression of the reverse transmission loss quantity of the partition line loss is determined;

[0218] According to the expression of the power reduction of the line loss absorption in the partition area and the expression of the power increase of the line loss reverse transmission in the partition area, the expression of the influence of the access of the distributed generation on the line loss of the distribution network considering the reverse transmission power is determined;

[0219] According to the expression of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss and the partition line loss judgment strategy, the calculation model of the impact of the distributed generation access considering the reverse power transmission on the distribution network line loss is determined;

[0220] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the reverse power is as follows:

[0221] ΔA=(A′×a′%+B′×b′%)-(A×a%+B×b%);

[0222] The partition line loss judgment strategy is as follows:

[0223] When ΔA is greater than 0, the impact of distributed generation access on the line loss of distribution network partitions increases;

[0224] When ΔA is equal to 0, the impact of distributed generation access on the line loss of distribution network partitions remains unchanged;

[0225] When ΔA is less than 0, the impact of distributed generation access on the line loss of distribution network partitions is reduced;

[0226] A′ is the power consumption of 0.4KV grid-connected voltage level, a′% is the voltage layer voltage loss rate above 0.4KV grid-connected voltage level, B′ is the power consumption of 10KV grid-connected voltage level, b′% is the voltage layer voltage loss rate above 10KV grid-connected voltage level, A is the reverse transmission power of 0.4KV grid-connected voltage level, a% is the voltage layer voltage loss rate of 0.4KV grid-connected voltage level, B is the reverse transmission power of 10KV grid-connected voltage level, b% is the voltage layer voltage loss rate of 10KV grid-connected voltage level, ΔA is the calculation result of the impact of distributed power access on distribution network line loss considering the reverse transmission power.

[0227] Preferably, when the reverse power transmission factor includes the reverse power transmission amount ratio, the calculation model construction submodule is specifically used for:

[0228] Determine the proportion expression of voltage division loss rate of each voltage layer above the grid-connected voltage level according to the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level;

[0229] Determine the reverse transmission quantity ratio expression of each grid-connected voltage level according to the reverse transmission quantity and the consumed quantity of each grid-connected voltage level;

[0230] According to the reverse power ratio expression of each grid-connected voltage level and the voltage layer voltage loss ratio expression above each grid-connected voltage level, the expression of the influence of the access of distributed generation on the line loss of the distribution network considering the reverse power ratio is determined;

[0231] According to the expression of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network and the voltage-dividing line loss judgment strategy, the calculation model of the impact of distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network is determined;

[0232] Among them, the expression of the impact of distributed generation access on distribution network line loss considering the proportion of reverse power is as follows:

[0233]

[0234] The strategy for judging the voltage division line loss is as follows:

[0235] When ΔQ is greater than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level increases;

[0236] When ΔQ is equal to 0, the influence of the voltage-dividing line loss of the grid-connected voltage level on the access of distributed generation remains unchanged;

[0237] When ΔQ is less than 0, the influence of the voltage-dividing line loss of the distributed generation access on the grid-connected voltage level is reduced;

[0238] k is the proportion of reverse power transmission at the grid-connected voltage level, q′% is the voltage division loss rate of the voltage layer above the grid-connected voltage level, q% is the voltage division loss rate of the voltage layer at the grid-connected voltage level, and ΔQ is the calculation result of the impact of distributed generation access on the distribution network line loss considering the proportion of reverse power transmission.

[0239] Preferably, the system further comprises:

[0240] The evaluation result output module is used to output the evaluation results and display the impact of distributed power access on the line loss of the distribution network.

[0241] Preferably, the data acquisition module includes:

[0242] The initial data acquisition submodule is used to obtain the initial data on the impact of the access of distributed power sources on the line loss of the distribution network;

[0243] The data preprocessing submodule is used to preprocess the initial data to obtain data on the impact of distributed power access on distribution network line losses.

[0244] Preferably, the initial data acquired by the initial data acquisition submodule includes one or more of the following: distribution network topology data, distributed power source data, historical operation data, and environmental meteorological data;

[0245] The distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers of the distribution network, distribution network parameter data, and distribution network operation status information;

[0246] The distributed power source data includes one or more of the following: the access location data, capacity data, type data, operation status data, and output power data of the distributed power source;

[0247] The historical operation data includes one or more of the following: historical load data of the distribution network, voltage and current data of the distribution network, and power factor of the distribution network;

[0248] Environmental meteorological data include one or more of the following: wind speed, wind direction, solar radiation, air temperature, and air humidity.

[0249] Preferably, the data preprocessing submodule preprocesses the initial data including one or more of the following: data cleaning, data conversion, data standardization, feature extraction;

[0250] Data cleaning is used to remove duplicate, erroneous or abnormal data, fill in missing values ​​of the removed data, and smooth the data after filling in missing values ​​to reduce data noise;

[0251] Data conversion is used to convert or encode data format according to the requirements of the calculation model of the impact of distributed power access on distribution network line loss, so as to obtain data in a unified format;

[0252] Data standardization is used to standardize data to conform to specific distribution rules and obtain standardized data.

[0253] Feature extraction is used to extract feature data related to the impact of distributed generation access on distribution network line losses. The feature data includes one or more of the following: the grid-connected voltage level of the distributed generation, the voltage-dividing line loss rate value of each grid-connected voltage level, and the power consumption value of each grid-connected voltage level.

[0254] Embodiment 3:

[0255] Based on the same inventive concept, Figure 5 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0256] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a readable storage medium to implement the corresponding method flow or corresponding functions, so as to realize the steps of the method for measuring the impact of distributed power access on the line loss of the distribution network in the above-mentioned embodiment.

[0257] Embodiment 4:

[0258] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It can be understood that the readable storage medium here can include both built-in storage media in electronic devices and, of course, extended storage media supported by electronic devices. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk storage. The processor can load and execute one or more instructions stored in the storage medium to implement the steps of the method for measuring the impact of distributed power access on the line loss of the distribution network in the above embodiment.

[0259] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0260] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0261] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0262] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0263] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A method for calculating the impact of distributed power access on distribution network line loss, characterized in that: include: Obtain data on the impact of distributed generation access on distribution network line losses; Based on the optimization algorithm and the data on the impact of distributed power generation access on the distribution network line loss, the measurement model of the impact of distributed power generation access on the distribution network line loss considering the reverse power transmission factor is solved to obtain the evaluation results of the impact of distributed power generation access on the distribution network line loss.

2. The method according to claim 1, characterized in that The optimization algorithm and the calculation model of the impact of the distributed power access on the distribution network line loss are solved to obtain the evaluation results of the impact of the distributed power access on the distribution network line loss, including: Based on the data of the impact of the distributed power generation access on the line loss of the distribution network, the calculation model of the impact of the distributed power generation access on the line loss of the distribution network considering the reverse power transmission factor is used to obtain the initial calculation result of the impact of the distributed power generation access on the line loss of the distribution network; Based on the initial calculation results, an optimization algorithm is used to optimize the value of the reverse power transmission factor to obtain an optimized calculation model for the impact of the access of distributed power sources on the line loss of the distribution network; The optimized calculation model of the impact of the distributed power access on the distribution network line loss is used to output the evaluation result of the impact of the distributed power access on the distribution network line loss.

3. The method according to claim 2, characterized in that The reverse power transmission factor includes the reverse power transmission amount and / or the reverse power transmission ratio.

4. The method according to claim 3, characterized in that When the reverse power transmission factor includes the reverse power transmission amount, the construction process of the calculation model of the impact of the distributed power generation access on the distribution network line loss considering the reverse power transmission factor includes: According to the product of the power consumption of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level, the expression of power consumption reduction of the sub-area line loss is determined; According to the product of the reverse transmission quantity of each grid-connected voltage level and the voltage layer voltage division loss rate of the corresponding grid-connected voltage level, the expression of the reverse transmission loss quantity of the partition line loss is determined; According to the expression of the reduced power consumption of the partition line loss and the expression of the increased power consumption of the partition line loss, an expression of the influence of the access of the distributed power generation considering the reverse power on the line loss of the distribution network is determined; According to the expression of the influence of the distributed power generation access considering the reverse transmission amount on the line loss of the distribution network and the partition line loss judgment strategy, a calculation model of the influence of the distributed power generation access considering the reverse transmission amount on the line loss of the distribution network is determined; The expression of the influence of the distributed generation access considering the reverse transmission amount on the line loss of the distribution network is as follows: ΔA=(A′×a′%+B′×b′%)-(A×a%+B×b%); The partition line loss judgment strategy is as follows: When ΔA is greater than 0, the impact of distributed generation access on the line loss of distribution network partitions increases; When ΔA is equal to 0, the impact of distributed generation access on the line loss of distribution network partitions remains unchanged; When ΔA is less than 0, the impact of distributed generation access on the line loss of distribution network partitions is reduced; A′ is the power consumption of 0.4KV grid-connected voltage level, a′% is the voltage layer voltage loss rate above 0.4KV grid-connected voltage level, B′ is the power consumption of 10KV grid-connected voltage level, b′% is the voltage layer voltage loss rate above 10KV grid-connected voltage level, A is the reverse transmission power of 0.4KV grid-connected voltage level, a% is the voltage layer voltage loss rate of 0.4KV grid-connected voltage level, B is the reverse transmission power of 10KV grid-connected voltage level, b% is the voltage layer voltage loss rate of 10KV grid-connected voltage level, ΔA is the calculation result of the impact of distributed power access on distribution network line loss considering the reverse transmission power.

5. The method according to claim 3, characterized in that: When the reverse power transmission factor includes the reverse power transmission amount ratio, the construction process of the calculation model for the impact of the distributed power generation access on the distribution network line loss considering the reverse power transmission factor includes: Determine the proportion expression of voltage division loss rate of each voltage layer above the grid-connected voltage level according to the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the voltage layer above the corresponding grid-connected voltage level; Determine the reverse transmission amount ratio expression of each grid-connected voltage level according to the reverse transmission amount and the consumed amount of each grid-connected voltage level; According to the above-mentioned reverse transmission quantity ratio expression of each grid-connected voltage level and the above-mentioned voltage layer voltage division loss ratio expression, an expression of the influence of the access of distributed generation on the line loss of the distribution network considering the reverse transmission quantity ratio is determined; According to the expression of the influence of the distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network and the voltage-dividing line loss judgment strategy, a calculation model of the influence of the distributed generation access considering the proportion of reverse power transmission on the line loss of the distribution network is determined; Among them, the expression of the influence of distributed generation access on distribution network line loss considering the proportion of reverse power is as follows: The voltage division line loss judgment strategy is as follows: When ΔQ is greater than 0, the influence of the voltage-dividing line loss of the grid-connected voltage level increases. When ΔQ is equal to 0, the influence of the distributed generation access on the voltage division line loss of the grid-connected voltage level remains unchanged; When ΔQ is less than 0, the influence of the voltage-dividing line loss of the grid-connected voltage level by the access of the distributed power source is reduced; k is the proportion of reverse power transmission at the grid-connected voltage level, q′% is the voltage division loss rate of the voltage layer above the grid-connected voltage level, q% is the voltage division loss rate of the voltage layer at the grid-connected voltage level, and ΔQ is the calculation result of the impact of distributed generation access on the distribution network line loss considering the proportion of reverse power transmission.

6. The method according to claim 1, characterized in that After obtaining the evaluation result of the impact of the distributed power supply access on the distribution network line loss, the method further includes: The evaluation results are output to show the impact of the access of distributed generation on the line loss of the distribution network.

7. The method according to claim 1, characterized in that The data for obtaining the impact of distributed generation access on distribution network line losses includes: Obtain initial data on the impact of distributed generation access on distribution network line losses; The initial data is preprocessed to obtain data on the impact of the access of distributed power sources on the line loss of the distribution network.

8. The method according to claim 7, characterized in that The initial data on the impact of the distributed power supply access on the distribution network line loss includes one or more of the following: distribution network topology data, distributed power supply data, historical operation data, and environmental meteorological data; The distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers of the distribution network, distribution network parameter data, and distribution network operation status information; The distributed power source data includes one or more of the following: access location data, capacity data, type data, operation status data, and output power data of the distributed power source; The historical operation data includes one or more of the following: historical load data of the distribution network, voltage and current data of the distribution network, and power factor of the distribution network; The environmental meteorological data includes one or more of the following: wind speed, wind direction, solar radiation, air temperature, and air humidity.

9. The method according to claim 8, characterized in that The preprocessing of the initial data includes one or more of the following: data cleaning, data conversion, data standardization, feature extraction; The data cleaning is used to remove duplicate, erroneous or abnormal data, fill in missing values ​​of the removed data, and smooth the data after filling in missing values ​​to reduce data noise; The data conversion is used to convert or encode the data format according to the requirements of the calculation model of the impact of the distributed power supply access on the power distribution network line loss, so as to obtain data with a unified format; The data standardization is used to perform standardization processing on the data in accordance with a specific distribution law to obtain standardized data. The feature extraction is used to extract feature data related to the impact of distributed power generation access on distribution network line losses, and the feature data includes one or more of the following: the grid-connected voltage level of the distributed power generation, the divided voltage line loss rate value of each grid-connected voltage level, and the power consumption value of each grid-connected voltage level.

10. A system for measuring the impact of distributed power access on distribution network line loss, characterized in that: include: A data acquisition module is used to obtain data on the impact of distributed power access on distribution network line losses; The evaluation result acquisition module is used to solve the model of the impact of distributed power access on the distribution network line loss considering the reverse power transmission factor based on the optimization algorithm and the data of the impact of the distributed power access on the distribution network line loss, and obtain the evaluation result of the impact of the distributed power access on the distribution network line loss.

Images