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

Abstract

The application provides a kind of distributed power access influence on distribution network line loss measurement and calculation method and system, it is related to distribution network loss analysis technical field, method includes: obtaining the data of distributed power access influence on distribution network line loss;Based on optimization algorithm and the data of distributed power access influence on distribution network line loss, the measurement and calculation model of distributed power access influence on distribution network line loss considering the factor of reverse power transmission is solved, and the evaluation result of distributed power access influence on distribution network line loss is obtained.The application can accurately calculate the influence of distributed power access on distribution network line loss by considering the reverse power transmission characteristics of distributed power, and provide scientific decision basis for power system planners and managers.

Description

Technical Field

[0001] This invention belongs to the field of power distribution network loss analysis technology, specifically relating to a method and system for calculating the impact of distributed power source access on power distribution network line losses. Background Technology

[0002] With the transformation of the energy structure and the increasing awareness of environmental protection, the integration of distributed generation into the distribution network has become an important trend in power system development. Distributed generation mainly includes renewable energy power generation forms such as wind and solar power, which are clean, environmentally friendly, flexible, and reliable. However, with the integration of a large number of distributed generation sources, the energy flow distribution of the distribution network has changed significantly, posing new challenges to traditional distribution network planning and operation management. First, the rapid integration of distributed generation sources initially reduces line losses in the distribution network but then increases them. When the penetration rate of distributed generation is low and it is mainly consumed locally, it helps reduce grid losses; when the penetration rate of distributed generation is high and it cannot be consumed locally, the electricity is fed back to the upstream grid, increasing the line losses of the distribution network. When the proportion of distributed generation backflow exceeds a certain range, the distributed backflow will increase distribution network losses, leading to an increase in total grid losses, and distributed generation may change from a loss-reducing factor to a loss-increasing factor. Second, energy storage and the integration of diverse loads play a significant role in mitigating the reverse power flow caused by the large-scale integration of distributed generation sources and reducing distribution network losses. Third, the integration of distributed generation sources changes the power flow direction of the distribution network, making the energy flow in the distribution network more complex. When the electrical energy generated by distributed generation exceeds local load demand, backfeeding occurs, meaning the distributed generation supplies electrical energy to the distribution network. Backfeeding not only increases the complexity of the distribution network but also significantly impacts its line losses. The integration of distributed generation also affects distribution network line losses; the integration of distributed generation at different grid connection voltage levels causes changes in the current distribution within the distribution network, thus affecting the magnitude of line losses. Simultaneously, the amount of electricity consumed and fed back by distributed generation directly influences its generated and fed electrical energy, thereby impacting distribution network line losses.

[0003] The most common existing technology for assessing the impact of distributed generation (DG) access on distribution network line losses is power flow calculation-based. This method establishes a power flow calculation model of the distribution network, considers the impact of DG access on power flow distribution, and thus calculates the magnitude of line losses. However, this method does not consider all factors comprehensively and cannot accurately assess the impact of DG access on line losses. Some studies have proposed artificial intelligence-based line loss measurement methods, which utilize historical data and machine learning algorithms to build predictive models to assess the impact of DG access on line losses. This method has certain advantages in handling complex problems, but its accuracy and stability need improvement. Therefore, the assessment results obtained by existing technologies in addressing the impact of DG access on distribution network line losses are not accurate enough and cannot truly reflect the actual line loss situation caused by DG access. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a method for addressing the impact of distributed power source integration on distribution network line losses, comprising:

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

[0006] Based on optimization algorithms and data on the impact of distributed generation access on distribution network line losses, a calculation model considering the backfeed factor on the impact of distributed generation access on distribution network line losses is solved to obtain the assessment results of the impact of distributed generation access on distribution network line losses.

[0007] Preferably, the evaluation results of the impact of distributed generation access on distribution network line losses are obtained by solving an optimization algorithm and a calculation model based on the impact of distributed generation access on distribution network line losses, including:

[0008] Based on data on the impact of distributed generation access on distribution network line losses, an initial calculation result of the impact of distributed generation access on distribution network line losses is obtained using a calculation model that considers the reverse power transmission factor.

[0009] Based on the initial calculation results, the value of the reverse power transmission factor is optimized using an optimization algorithm to obtain an optimized calculation model for the impact of distributed power generation access on distribution network line losses.

[0010] Using an optimized calculation model for the impact of distributed generation access on distribution network line losses, the assessment results of the impact of distributed generation access on distribution network line losses are output.

[0011] Preferably, the backfeeding factor includes the backfeeding power volume and / or the proportion of backfeeding power volume.

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

[0013] Based on the power consumption of each grid-connected voltage level and the corresponding

[0014] The product of the voltage level loss rates above determines the expression for the reduction of line loss in the zone;

[0015] The expression for the increased power loss due to reverse transmission of each grid-connected voltage level is determined by multiplying the reverse transmission power of each grid-connected voltage level with the voltage level drop loss rate of the corresponding grid-connected voltage level.

[0016] Based on the expressions for the reduced power consumption due to regional line loss and the increased power consumption due to the reverse transmission of regional line loss, the expression for the impact of distributed power generation on distribution network line loss considering the reverse transmission of power is determined.

[0017] Based on the expression for the impact of distributed generation access considering reverse power supply on distribution network line losses and the zoned line loss judgment strategy, a calculation model for the impact of distributed generation access considering reverse power supply on distribution network line losses is determined.

[0018] The expression for the impact of distributed generation access considering reverse power transmission on distribution network line losses is as follows:

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

[0020] The strategy for determining the zone line loss is as follows:

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

[0022] When ΔA equals 0, the impact of distributed generation access on the distribution network zone line loss remains unchanged.

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

[0024] A′ represents the power consumption at the 0.4kV grid-connected voltage level, a′% represents the voltage drop rate of the voltage layer above the 0.4kV grid-connected voltage level, B′ represents the power consumption at the 10kV grid-connected voltage level, b′% represents the voltage drop rate of the voltage layer above the 10kV grid-connected voltage level, A represents the reverse power transmission at the 0.4kV grid-connected voltage level, a% represents the voltage drop rate of the voltage layer at the 0.4kV grid-connected voltage level, B represents the reverse power transmission at the 10kV grid-connected voltage level, b% represents the voltage drop rate of the voltage layer at the 10kV grid-connected voltage level, and ΔA represents the calculated result of the impact of distributed power generation access on distribution network line losses considering reverse power transmission.

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

[0026] The expression for the proportion of voltage division loss rate of voltage layers above each grid-connected voltage level is determined based on the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the corresponding voltage layers above the grid-connected voltage level.

[0027] The expression for the proportion of reverse power transmission at each grid-connected voltage level is determined based on the reverse power transmission and absorption power at each grid-connected voltage level.

[0028] Based on the expressions for the proportion of reverse power transmission at each grid-connected voltage level and the expressions for the proportion of voltage drop loss rate at voltage levels above each grid-connected voltage level, the expression for the impact of distributed power generation access on distribution network line loss considering the proportion of reverse power transmission is determined.

[0029] Based on the expression for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses and the voltage-dividend line loss judgment strategy, a calculation model for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses is determined.

[0030] The expression for the impact of distributed generation access on distribution network line losses, considering the proportion of reverse power transmission, is as follows:

[0031]

[0032] The strategy for determining the resistance level and loss line is as follows:

[0033] When ΔQ is greater than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level increases;

[0034] When ΔQ equals 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level remains unchanged;

[0035] When ΔQ is less than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level is reduced;

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

[0037] Preferably, after obtaining the assessment results of the impact of distributed generation access on distribution network line losses, the method further includes:

[0038] The output evaluation results are used to demonstrate the impact of distributed generation access on distribution network line losses.

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

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

[0041] Data preprocessing is performed on the initial data to obtain data on the impact of distributed power generation on distribution network line losses.

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

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

[0044] Distributed power source data includes one or more of the following: data on the location of the distributed power source, capacity data, type data, operating status data, and output power data;

[0045] Historical operating 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, the preprocessing of the initial data includes one or more of the following: data cleaning, data transformation, data standardization, and feature extraction;

[0048] Data cleaning is used to remove duplicate, erroneous, or outlier data, fill in missing values ​​in 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 according to the requirements of the calculation model of the impact of distributed power generation on the line loss of the distribution network, so as to obtain data with a unified format.

[0050] Data standardization is used to standardize data to conform to a specific distribution pattern, thereby obtaining standardized data.

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

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

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

[0054] The evaluation result acquisition module is used to solve the model of the impact of distributed generation access on distribution network line losses based on optimization algorithms and data on the impact of distributed generation access on distribution network line losses, taking into account the reverse power transmission factor, and obtain the evaluation results of the impact of distributed generation access on distribution network line losses.

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

[0056] The initial calculation result acquisition submodule is used to obtain the initial calculation results of the impact of distributed generation access on distribution network line loss based on the data on the impact of distributed generation access on distribution network line loss using the calculation model of the impact of distributed generation access on distribution network line loss considering the back-feeding 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, and obtain the optimized calculation model of the impact of distributed power generation access on distribution network line loss.

[0058] The evaluation result acquisition submodule is used to utilize the optimized calculation model of the impact of distributed power source access on distribution network line losses and output the evaluation results of the impact of distributed power source access on distribution network line losses.

[0059] Preferably, the backfeeding factor includes the backfeeding power volume and / or the proportion of backfeeding power volume.

[0060] Preferably, the system also includes a measurement model construction submodule.

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

[0062] The expression for the reduction in line loss absorption capacity for each grid-connected voltage level is determined by multiplying the absorption capacity of each grid-connected voltage level with the voltage drop rate of the voltage layer above the corresponding grid-connected voltage level.

[0063] The expression for the increased power loss due to reverse transmission of each grid-connected voltage level is determined by multiplying the reverse transmission power of each grid-connected voltage level with the voltage level drop loss rate of the corresponding grid-connected voltage level.

[0064] Based on the expressions for the reduced power consumption due to regional line loss and the increased power consumption due to the reverse transmission of regional line loss, the expression for the impact of distributed power generation on distribution network line loss considering the reverse transmission of power is determined.

[0065] Based on the expression for the impact of distributed generation access considering reverse power supply on distribution network line losses and the zoned line loss judgment strategy, a calculation model for the impact of distributed generation access considering reverse power supply on distribution network line losses is determined.

[0066] The expression for the impact of distributed generation access considering reverse power transmission on distribution network line losses is as follows:

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

[0068] The strategy for determining the zone line loss is as follows:

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

[0070] When ΔA equals 0, the impact of distributed generation access on the distribution network zone line loss remains unchanged.

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

[0072] A′ represents the power consumption at the 0.4kV grid-connected voltage level, a′% represents the voltage drop rate of the voltage layer above the 0.4kV grid-connected voltage level, B′ represents the power consumption at the 10kV grid-connected voltage level, b′% represents the voltage drop rate of the voltage layer above the 10kV grid-connected voltage level, A represents the reverse power transmission at the 0.4kV grid-connected voltage level, a% represents the voltage drop rate of the voltage layer at the 0.4kV grid-connected voltage level, B represents the reverse power transmission at the 10kV grid-connected voltage level, b% represents the voltage drop rate of the voltage layer at the 10kV grid-connected voltage level, and ΔA represents the calculated result of the impact of distributed power generation access on distribution network line losses considering reverse power transmission.

[0073] Preferably, when the reverse power feeding factor includes the proportion of reverse power feeding, the calculation model construction submodule is specifically used for:

[0074] The expression for the proportion of voltage division loss rate of voltage layers above each grid-connected voltage level is determined based on the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the corresponding voltage layers above the grid-connected voltage level.

[0075] The expression for the proportion of reverse power transmission at each grid-connected voltage level is determined based on the reverse power transmission and absorption power at each grid-connected voltage level.

[0076] Based on the expressions for the proportion of reverse power transmission at each grid-connected voltage level and the expressions for the proportion of voltage drop loss rate at voltage levels above each grid-connected voltage level, the expression for the impact of distributed power generation access on distribution network line loss considering the proportion of reverse power transmission is determined.

[0077] Based on the expression for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses and the voltage-dividend line loss judgment strategy, a calculation model for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses is determined.

[0078] The expression for the impact of distributed generation access on distribution network line losses, considering the proportion of reverse power transmission, is as follows:

[0079]

[0080] The strategy for determining the resistance level and loss line is as follows:

[0081] When ΔQ is greater than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level increases;

[0082] When ΔQ equals 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level remains unchanged;

[0083] When ΔQ is less than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level is reduced;

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

[0085] Preferably, the system also includes:

[0086] The evaluation result output module is used to output the evaluation results, showing the impact of distributed power source access on distribution network line losses.

[0087] Preferably, the data acquisition module includes:

[0088] The initial data acquisition submodule is used to acquire initial data on the impact of distributed power source access on distribution network line losses;

[0089] The data preprocessing submodule is used to preprocess the initial data to obtain data on the impact of distributed power source 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] Distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers in the distribution network, distribution network parameter data, and distribution network operating status information;

[0092] Distributed power source data includes one or more of the following: data on the location of the distributed power source, capacity data, type data, operating status data, and output power data;

[0093] Historical operating 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 performs preprocessing on the initial data, including one or more of the following: data cleaning, data transformation, data standardization, and feature extraction;

[0096] Data cleaning is used to remove duplicate, erroneous, or outlier data, fill in missing values ​​in 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 according to the requirements of the calculation model of the impact of distributed power generation on the line loss of the distribution network, so as to obtain data with a unified format.

[0098] Data standardization is used to standardize data to conform to a specific distribution pattern, thereby obtaining standardized data.

[0099] Feature extraction is used to extract feature data related to the impact of distributed generation access on distribution network line losses. Feature data includes one or more of the following: grid connection voltage level of distributed generation, voltage division line loss rate value of each grid connection voltage level, and power consumption value of each grid connection 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; wherein 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 method for calculating the impact of distributed power source access on distribution network line losses, as described above, is implemented.

[0103] Based on the same inventive concept, the present invention also provides a readable storage medium having an executable program stored thereon, which, when executed, implements the method for calculating the impact of distributed power source access on distribution network line losses as described above.

[0104] Compared with the closest existing technology, the present invention has the following beneficial effects:

[0105] This invention provides a method for assessing the impact of distributed generation (DG) access on distribution network line losses. The method includes: acquiring data on the impact of DG access on distribution network line losses; and, based on an optimization algorithm and the data, solving a calculation model considering the backfeeding factor to determine the impact of DG access on distribution network line losses, thereby obtaining an assessment result of the impact. By considering the backfeeding characteristics of DG, this invention can accurately calculate the impact of DG access on distribution network line losses, providing a scientific basis for power system planners and managers to make informed decisions. Attached Figure Description

[0106] Figure 1 A flowchart illustrating the method for calculating the impact of distributed power source access on distribution network line losses provided by this invention;

[0107] Figure 2 A flowchart for calculating the impact of distributed power source access on distribution network line losses provided by this invention;

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

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

[0110] Figure 5 A schematic diagram of the electronic device provided by the present invention. Detailed Implementation

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

[0112] Example 1:

[0113] This invention provides a method for calculating the impact of distributed power source access on distribution network line losses. Specifically, Figure 1 The flowchart of the method for calculating the impact of distributed power source access on distribution network line losses provided in this embodiment of the invention is shown in the figure, and includes the following steps:

[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 source access on distribution network line losses, the calculation model of the impact of distributed power source access on distribution network line losses considering the reverse power transmission factor is solved to obtain the evaluation results of the impact of distributed power source access on distribution network line losses.

[0116] This invention, by considering the reverse power transmission characteristics of distributed generation sources, accurately calculates the impact of distributed generation source access on distribution network line losses, providing a scientific basis for power system planners and managers to make decisions.

[0117] Data collection is the first step in obtaining the information needed to analyze the impact of distributed generation access on distribution network line losses. In one implementation, to accurately assess the impact of distributed generation access on distribution network line losses, the collected data can be preprocessed. For example, the data obtained in S1 regarding the impact of distributed generation access on distribution network line losses includes:

[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] Initial data on the impact of distributed generation on distribution network line losses is the first step in analyzing the information needed for this analysis. According to the requirements of this invention, the initial data acquired includes one or more of the following: distribution network topology data, distributed generation data, historical operational data, and environmental meteorological data. Initial data can be acquired through various methods, such as on-site measurement, equipment monitoring, and database queries.

[0121] It is 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 source access on distribution network line losses and the method of obtaining such data are within the scope of protection claimed in this invention.

[0122] Distribution network topology data includes connection relationships between nodes, lines, transformers, and other equipment in the distribution network, distribution network parameter data, and distribution network operating status information. Distribution network topology data is the foundation for constructing distribution network power flow calculation models.

[0123] Distributed power generation data includes data on the location of distributed power sources, capacity, type (e.g., wind power, solar power), operating status, and output power. In particular, data on the reverse power transmission capability and operational status of distributed power sources are crucial for assessing their impact on distribution network line losses.

[0124] Historical operational data includes historical load data, voltage and current data, and power factor of the distribution network. This data helps in understanding the operational patterns of the distribution network and provides a basis for model building and optimization.

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

[0126] After obtaining initial data on the impact of distributed generation on distribution network line losses, preprocessing can be performed to ensure the accuracy and completeness of the data. Data preprocessing yields high-quality, standardized datasets, providing reliable data support for subsequent model building and optimization.

[0127] Data preprocessing is the process of cleaning, transforming, and standardizing the acquired initial data to meet the requirements of model analysis and computation. Based on the needs of this invention, the preprocessing of initial data includes one or more of the following: data cleaning, data transformation, data standardization, and feature extraction.

[0128] Data cleaning is used to remove duplicate, erroneous, or abnormal data, fill in missing values, and smooth the data after missing value filling to reduce noise. For example, it's used to identify and correct abnormal voltage or current data in a power distribution network. 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 according to the requirements of the calculation model of the impact of distributed power generation on the line loss of the distribution network. For example, data with different units or dimensions can be converted into a unified standard unit to facilitate calculation and analysis.

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

[0131] Feature extraction is used to extract characteristic data related to the impact of distributed generation access on distribution network line losses from the data processed above, and to serve as input for model analysis. This characteristic data includes the grid connection voltage level of the distributed generation, the voltage-dividend line loss rate of each grid connection voltage level, the amount of electricity absorbed by each grid connection voltage level, and the reverse power transmission characteristics, etc.

[0132] It is understandable that the methods for preprocessing initial data are not limited to the above-mentioned methods, and the preprocessing of different initial data does not have to be performed in accordance with all the methods listed above. Several preprocessing methods can be selected according to the needs, and no restrictions are imposed here.

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

[0134] Based on data on the impact of distributed generation access on distribution network line losses, an initial calculation result of the impact of distributed generation access on distribution network line losses is obtained using a calculation model that considers the reverse power transmission factor.

[0135] Based on the initial calculation results, the value of the reverse power transmission factor is optimized using an optimization algorithm to obtain an optimized calculation model for the impact of distributed power generation access on distribution network line losses.

[0136] Using an optimized calculation model for the impact of distributed generation access on distribution network line losses, the assessment results of the impact of distributed generation access on distribution network line losses are output.

[0137] Specifically, the data on the impact of distributed generation (DG) access on distribution network line losses are substituted into a calculation model that considers the backfeeding factor to obtain initial calculation results. Then, based on these initial results, the value of the backfeeding factor is optimized using a particle swarm optimization algorithm to obtain an optimized calculation model. Finally, the optimized model is used to output the evaluation results of the impact of DG access on distribution network line losses.

[0138] After outputting the evaluation results, a visualization 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 supply access on line loss.

[0139] The following section details the calculation model for the impact of distributed generation access on distribution network line losses, which is pre-constructed and considers the backfeeding factor. It also details how S2, based on optimization algorithms and data on the impact of distributed generation access on distribution network line losses, solves the calculation model to obtain the assessment results of the impact of distributed generation access on distribution network line losses.

[0140] To address the problem that existing technologies fail to accurately reflect the line loss situation of distribution networks after the integration of distributed generation sources, resulting in inaccurate assessments, this invention comprehensively considers the grid connection voltage level, power consumption, and reverse power transmission characteristics of distributed generation sources when calculating their impact on distribution network line losses. A reverse power transmission factor is introduced to quantify the reverse power transmission capability of distributed generation sources and its impact on distribution network line losses.

[0141] Local consumption of distributed generation (DG) has a loss-reducing effect on the power grid. Consuming DG reduces the amount of electricity transmitted to higher-level grids, thus reducing power losses. However, DG backfeeding has both loss-reducing and loss-increasing effects on the power grid. On the one hand, transmitting excess electricity to the grid increases power losses at the current voltage level, thus increasing losses for that voltage level grid. On the other hand, if excess electricity is fed back to the higher-level grid and can be consumed there, it reduces the amount of electricity transmitted to higher-level grids, thus reducing losses. Therefore, when the penetration rate of distributed generation is low, local consumption of DG helps reduce grid losses. As the penetration rate of distributed generation gradually increases, and DG cannot be consumed locally, backfeeding to the higher-level grid may increase grid losses. Clearly defining the impact of loss reduction or loss increase provides a scientific basis for power system planners and managers to make informed decisions.

[0142] In this invention, the reverse power supply factor includes the reverse power supply amount and / or the reverse power supply percentage.

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

[0144] Based on the product of the absorbed power at each grid-connected voltage level and the voltage drop rate of the voltage layer above the corresponding grid-connected voltage level, the expression for the power reduction in the absorption of regional line losses is determined. Based on the product of the reverse power at each grid-connected voltage level and the voltage drop rate of the voltage layer above the corresponding grid-connected voltage level, the expression for the power increase in the reverse power of regional line losses is determined. By performing calculations on the expressions for the power reduction in the absorption of regional line losses and the power increase in the reverse power of regional line losses, the expression for the impact of distributed generation access considering reverse power on distribution network line losses is determined. Based on the expression for the impact of distributed generation access considering reverse power on distribution network line losses and the regional line loss judgment strategy, the calculation model for the impact of distributed generation access considering reverse power on distribution network line losses is determined.

[0145] Specifically, the expression for the reduced energy consumption of each grid-connected voltage level is obtained by multiplying the energy absorbed by each level by the voltage level division loss rate of the corresponding voltage level above the grid-connected voltage level; the expression for the increased energy consumption of each grid-connected voltage level by multiplying the energy fed back by each level by the voltage level division loss rate of the corresponding voltage level above the grid-connected voltage level is obtained; the difference between the expression for the reduced energy consumption of each grid-connected voltage level and the expression for the increased energy consumption of each grid-connected voltage level by the fed back energy is obtained to determine the expression for the impact of distributed generation access considering the fed back energy on distribution network line losses, and the zoned line loss judgment strategy is determined. Based on the expression and the zoned line loss judgment strategy, a calculation model for the impact of distributed generation access considering the fed back energy on distribution network line losses is determined.

[0146] Table 1 shows the factors affecting the line losses of the distribution network caused by distributed generation and an example of their data representation. Table 1 only considers 0.4kV and 10kV grid connection voltage levels. Other grid connection voltage levels, such as 35kV and above, can also be considered in actual applications. These are provided as examples only and are not intended to be limiting.

[0147]

[0148]

[0149] Table 1

[0150] Table 1 covers grid connection voltage level, voltage divider line loss rate, reverse power transmission, and power consumption. An expression for the impact of distributed power generation access on distribution network line loss considering reverse power transmission is constructed through various influencing factors.

[0151] The calculation model for the impact of distributed generation access considering reverse power transmission on distribution network line losses consists of two parts: an expression for the impact of distributed generation access considering reverse power transmission on distribution network line losses and a zoned line loss judgment strategy.

[0152] The expression for the impact of distributed generation access considering reverse power transmission on distribution network line losses is as follows:

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

[0154] The strategy for determining the zone line loss is as follows:

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

[0156] When ΔA equals 0, the impact of distributed generation access on the distribution network zone line loss remains unchanged.

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

[0158] A′ represents the power consumption at the 0.4kV grid-connected voltage level, a′% represents the voltage drop rate of the voltage layer above the 0.4kV grid-connected voltage level, B′ represents the power consumption at the 10kV grid-connected voltage level, b′% represents the voltage drop rate of the voltage layer above the 10kV grid-connected voltage level, A represents the reverse power transmission at the 0.4kV grid-connected voltage level, a% represents the voltage drop rate of the voltage layer at the 0.4kV grid-connected voltage level, B represents the reverse power transmission at the 10kV grid-connected voltage level, b% represents the voltage drop rate of the voltage layer at the 10kV grid-connected voltage level, and ΔA represents the calculated result of the impact of distributed power generation access on distribution network line losses considering reverse power transmission.

[0159] When the reverse power feeding factor includes the proportion of reverse power feeding, the process of constructing a calculation model for the impact of distributed generation access on distribution network line losses considering the reverse power feeding factor includes:

[0160] The expression for the proportion of voltage division loss rate of voltage layers above each grid-connected voltage level is determined based on the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the corresponding voltage layers above the grid-connected voltage level.

[0161] The expression for the proportion of reverse power transmission at each grid-connected voltage level is determined based on the reverse power transmission and absorption power at each grid-connected voltage level.

[0162] Based on the expressions for the proportion of reverse power transmission at each grid-connected voltage level and the expressions for the proportion of voltage drop loss rate at voltage levels above each grid-connected voltage level, the expression for the impact of distributed power generation access on distribution network line loss considering the proportion of reverse power transmission is determined.

[0163] Based on the expression for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses and the voltage-dividend line loss judgment strategy, a calculation model for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses is determined.

[0164] Specifically, based on the proportion of the voltage division loss rate of each voltage level above the grid connection voltage level in the sum of the voltage division loss rates of each voltage level above the grid connection voltage level and the voltage division loss rates of the grid connection voltage level, an expression for the proportion of the voltage division loss rate of each voltage level above the grid connection voltage level is determined; based on the back-feeding power and the absorbed power at each grid connection voltage level, an expression for the proportion of the back-feeding power at each grid connection voltage level is determined; the difference between the expressions for the proportion of the voltage division loss rate of each voltage level above the grid connection voltage level and the expressions for the proportion of the back-feeding power is used to obtain an expression for the impact of distributed power generation access on distribution network line losses considering the proportion of back-feeding power, and a voltage division loss judgment strategy is also obtained. Based on the expression for the impact of distributed power generation access on distribution network line losses considering the proportion of back-feeding power and the voltage division loss judgment strategy, a calculation model for the impact of distributed power generation access on distribution network line losses considering the proportion of back-feeding power is determined.

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

[0166] The expression for the impact of distributed power source access on distribution network line losses, considering the proportion of reverse power transmission, is as follows:

[0167]

[0168] The strategy for determining the voltage divider line loss is as follows:

[0169] When ΔQ is greater than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level increases;

[0170] When ΔQ equals 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level remains unchanged;

[0171] When ΔQ is less than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level is reduced;

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

[0173] When the grid connection voltage level is 0.4KV, the proportion of reverse power transmission is k. 0.4 The expression for the proportion of reverse-sent electricity is:

[0174]

[0175] Following the example in Table 1,

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

[0177] The strategy for judging the pressure distribution line loss is as follows:

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

[0179] When ΔQ 0.4 When the value is 0, the impact of distributed power source access on the 0.4KV voltage drop line loss remains unchanged;

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

[0181] When the grid connection voltage level is 10KV, the proportion of reverse power transmission is k. 10 ,

[0182] The total amount of electricity fed into the grid by 10kV distributed power sources can be the sum of the electricity fed into the grid by 10kV distributed power sources and the amount of electricity fed back to 10kV by 0.4kV distributed power sources, that is, the sum of the electricity generated at this voltage level and the electricity fed back to this voltage level from a lower voltage level; the total amount of electricity fed into the grid by 10kV distributed power sources can also be the sum of the electricity consumed by 10kV distributed power sources and the amount of electricity fed back to higher voltage levels by 10kV distributed power sources, that is, the sum of the electricity consumed at this voltage level and the amount of electricity fed back to higher voltage levels.

[0183] Specifically, the total amount of electricity fed into the grid by 10kV distributed power sources can be expressed in two ways: one is that the total amount of electricity fed into the grid by 10kV distributed power sources = the amount of electricity fed into the grid by 10kV distributed power sources + the amount of electricity fed back by 0.4kV distributed power sources; the other is that the total amount of electricity fed into the grid by 10kV distributed power sources = the amount of electricity consumed by 10kV distributed power sources + the amount of electricity fed back by 10kV distributed power sources.

[0184] The expression for the proportion of reverse power transmission is:

[0185] Following the example in Table 1,

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

[0187] The strategy for judging the pressure distribution line loss is as follows:

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

[0189] When ΔQ 10 When the value is 0, the impact of distributed power source access on the 10KV voltage drop line loss remains unchanged;

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

[0191] After constructing a calculation model for the impact of distributed generation (DG) access on distribution network line losses considering the backfeeding factor using the above method, the data obtained in S1, including grid connection voltage level, voltage level loss rate above the grid connection voltage level, voltage level loss rate at the grid connection voltage level, and power consumption, are substituted into the calculation model to obtain an expression for the impact of the backfeeding factor and DG access on distribution network line losses, serving as the initial calculation result. Further, based on the initial calculation result, an advanced particle swarm optimization algorithm is used to simulate the changes in distribution network line losses after different DG accesses by adjusting the value of the backfeeding factor. The optimized calculation model for the impact of DG access on distribution network line losses is then used to output the evaluation result of the impact of DG access on distribution network line losses. Through iterative optimization, the power loss of distributed generation on distribution network line losses is reduced, improving energy utilization efficiency. Simultaneously, the constraints of the distribution network are considered to ensure that the solution results meet actual operating requirements and are suitable for the evaluation of large-scale distribution networks.

[0192] The assessment results of the impact of distributed generation on distribution network line losses include indicators such as line loss rate and reverse power transmission. This invention provides a visual interface to display the assessment results in chart form, allowing users to intuitively understand the extent of the impact of distributed generation on distribution network line losses.

[0193] like Figure 2 The diagram shown illustrates a flowchart for calculating the impact of distributed power source access on distribution network line losses, as provided by this invention. First, data on the impact of distributed power source access on distribution network line losses is collected. This collected data includes, but is not limited to, electricity consumption data, load data, archival data, topology data, and meteorological data. The collected data is then preprocessed, including but not limited to data cleaning, data conversion, data standardization, and feature extraction and selection. Next, a calculation model for the impact of distributed power source access on distribution network line losses is established. This model is further optimized based on data such as voltage-division line loss rate, reverse power transmission, and power absorption. The model is then output, and further optimized through iterative algorithm optimization based on the output results. Finally, an evaluation result is output based on the optimized model, and the result is presented in a visual format.

[0194] Existing technologies fail to fully consider the backfeeding characteristics of distributed generation (DG) sources when addressing their impact on distribution network line losses. Many existing technologies and models neglect this backfeeding characteristic when assessing the impact of DG on distribution network line losses, leading to inaccurate evaluation results that fail to accurately reflect the actual line loss situation after DG integration. Furthermore, existing technologies suffer from insufficient computational accuracy and stability. Specifically, some models based on traditional calculation methods may face insufficient accuracy when dealing with complex DG integration scenarios. In addition, the numerous uncertainties introduced by DG integration may make it difficult for existing technologies to guarantee computational stability, thus affecting the reliability of the evaluation results. Therefore, there is a need to research a more accurate, stable, flexible calculation model that considers the overall operation of the distribution network.

[0195] This invention discloses a detailed design and process for constructing a calculation model of the impact of distributed generation on distribution network line losses, covering key steps such as the algorithm's iterative process and calculation rules. First, the model comprehensively considers the backfeeding characteristics of distributed generation, enabling accurate assessment of its impact on distribution network line losses. Second, the model considers factors such as the grid connection voltage level and backfeeding factor of distributed generation, making the assessment results more comprehensive and accurate. Finally, the model has high computational efficiency and stability, and can adapt to the assessment needs of large-scale distribution networks. This model can achieve the following effects: Accurate assessment of the impact of distributed generation access on line losses: The model can comprehensively consider the backfeeding characteristics of distributed generation and accurately calculate its impact on distribution network line losses. This helps power system planners and managers better understand the grid losses after distributed generation access, thereby formulating reasonable operation strategies and optimization schemes. Adapting to the development trend of new energy: With the rapid development of renewable energy, the proportion of distributed generation access to the grid is increasing. This model can adapt to this development trend, providing a scientific assessment method for new energy grid access and promoting the widespread application of new energy.

[0196] Specifically, this invention comprehensively considers the grid connection voltage level, power absorption capacity, and backfeed characteristics of distributed generation sources, and introduces a backfeed factor to quantify the backfeed capability of distributed generation sources and its impact on distribution network line losses. By adjusting the value of the backfeed factor, the changes in line losses under different distributed generation access conditions can be simulated, and iterative optimization can be performed to make the model more suitable for measuring the impact of backfeed distributed generation access on line losses, clarifying the impact of loss reduction or increase, calculating the line loss impact value, etc., improving calculation efficiency, and making it suitable for the evaluation of large-scale distribution networks, ensuring that the solution results meet the actual operation requirements.

[0197] This invention significantly improves the accuracy of assessing the impact of distributed generation (DG) on distribution network line losses. By constructing a calculation model that comprehensively considers the backfeed characteristics of DG, it is possible to more accurately calculate the line losses of the distribution network after DG integration, clarifying whether the DG impacts the grid by reducing or increasing losses. Clarifying the impact of reducing or increasing losses can provide a scientific basis for decision-making by power system planners and managers.

[0198] This invention also contributes to promoting the widespread application and development of new energy sources. By providing a more accurate method for assessing the impact of distributed power generation on distribution network line losses, it helps alleviate concerns about the potential negative impacts of new energy source integration into the grid, thereby promoting the widespread application and development of new energy sources and fostering sustainable development. Furthermore, by optimizing distributed power generation integration schemes, the impact of distribution network line losses is reduced, energy utilization efficiency is improved, and sustainable development is further promoted.

[0199] From both economic and social perspectives, this invention also offers significant advantages. By reducing grid line losses and improving energy efficiency through distributed photovoltaic power generation, it helps reduce the operating costs of the power system and enhances economic benefits. Simultaneously, promoting the application and development of new energy sources also contributes to improving environmental quality and enhancing social benefits.

[0200] like Figure 3 The diagram shown is a specific example of the method for calculating the impact of distributed power source access on distribution network line losses provided by the present invention.

[0201] Taking a local power grid as an example, the electricity generated by the distribution area was 15.533 billion kWh, of which 7.828 billion kWh (50.4%) was consumed locally. The electricity fed back from the distribution area to the 10kV system was 7.706 billion kWh (49.6%), of which 1.845 billion kWh was further fed back to higher voltage levels (35kV and 110kV), accounting for 11.9% of the electricity generated by the distribution area. Calculations of the impact of distributed power generation on line losses based on voltage levels show that distributed power generation reduces losses by 440.8 million kWh and increases losses by 276.4 million kWh, resulting in a total reduction of 164.4 million kWh and a decrease in overall network line losses by 0.074 percentage points.

[0202] Among them, the amount of electricity consumed = the amount of electricity fed into the grid - the amount of electricity fed back into the grid.

[0203] Increased power loss due to reverse transmission = Power reverse transmission from this voltage level × Voltage level voltage drop rate at the grid connection voltage level.

[0204] The power loss caused by absorption = power absorbed by this voltage level × voltage drop loss rate of voltage levels above the grid connection voltage level.

[0205] Example 2:

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

[0207] Data acquisition module 401 is used to acquire data on the impact of distributed power source access on distribution network line losses;

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

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

[0210] The initial calculation result acquisition submodule is used to obtain the initial calculation results of the impact of distributed generation access on distribution network line loss based on the data on the impact of distributed generation access on distribution network line loss using the calculation model of the impact of distributed generation access on distribution network line loss considering the back-feeding 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, and obtain the optimized calculation model of the impact of distributed power generation access on distribution network line loss.

[0212] The evaluation result acquisition submodule is used to utilize the optimized calculation model of the impact of distributed power source access on distribution network line losses and output the evaluation results of the impact of distributed power source access on distribution network line losses.

[0213] Preferably, the backfeeding factor includes the backfeeding power volume and / or the proportion of backfeeding power volume.

[0214] Preferably, the system also includes a measurement model construction submodule.

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

[0216] The expression for the reduction in line loss absorption capacity for each grid-connected voltage level is determined by multiplying the absorption capacity of each grid-connected voltage level with the voltage drop rate of the voltage layer above the corresponding grid-connected voltage level.

[0217] The expression for the increased power loss due to reverse transmission of each grid-connected voltage level is determined by multiplying the reverse transmission power of each grid-connected voltage level with the voltage level drop loss rate of the corresponding grid-connected voltage level.

[0218] Based on the expressions for the reduced power consumption due to regional line loss and the increased power consumption due to the reverse transmission of regional line loss, the expression for the impact of distributed power generation on distribution network line loss considering the reverse transmission of power is determined.

[0219] Based on the expression for the impact of distributed generation access considering reverse power supply on distribution network line losses and the zoned line loss judgment strategy, a calculation model for the impact of distributed generation access considering reverse power supply on distribution network line losses is determined.

[0220] The expression for the impact of distributed generation access considering reverse power transmission on distribution network line losses is as follows:

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

[0222] The strategy for determining the zone line loss is as follows:

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

[0224] When ΔA equals 0, the impact of distributed generation access on the distribution network zone line loss remains unchanged.

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

[0226] A′ represents the power consumption at the 0.4kV grid-connected voltage level, a′% represents the voltage drop rate of the voltage layer above the 0.4kV grid-connected voltage level, B′ represents the power consumption at the 10kV grid-connected voltage level, b′% represents the voltage drop rate of the voltage layer above the 10kV grid-connected voltage level, A represents the reverse power transmission at the 0.4kV grid-connected voltage level, a% represents the voltage drop rate of the voltage layer at the 0.4kV grid-connected voltage level, B represents the reverse power transmission at the 10kV grid-connected voltage level, b% represents the voltage drop rate of the voltage layer at the 10kV grid-connected voltage level, and ΔA represents the calculated result of the impact of distributed power generation access on distribution network line losses considering reverse power transmission.

[0227] Preferably, when the reverse power feeding factor includes the proportion of reverse power feeding, the calculation model construction submodule is specifically used for:

[0228] The expression for the proportion of voltage division loss rate of voltage layers above each grid-connected voltage level is determined based on the voltage division loss rate of each grid-connected voltage level and the voltage division loss rate of the corresponding voltage layers above the grid-connected voltage level.

[0229] The expression for the proportion of reverse power transmission at each grid-connected voltage level is determined based on the reverse power transmission and absorption power at each grid-connected voltage level.

[0230] Based on the expressions for the proportion of reverse power transmission at each grid-connected voltage level and the expressions for the proportion of voltage drop loss rate at voltage levels above each grid-connected voltage level, the expression for the impact of distributed power generation access on distribution network line loss considering the proportion of reverse power transmission is determined.

[0231] Based on the expression for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses and the voltage-dividend line loss judgment strategy, a calculation model for the impact of distributed power source access considering the proportion of reverse power transmission on distribution network line losses is determined.

[0232] The expression for the impact of distributed generation access on distribution network line losses, considering the proportion of reverse power transmission, is as follows:

[0233]

[0234] The strategy for determining the resistance level and loss line is as follows:

[0235] When ΔQ is greater than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level increases;

[0236] When ΔQ equals 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level remains unchanged;

[0237] When ΔQ is less than 0, the impact of distributed power source access on the voltage drop of the grid-connected voltage level is reduced;

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

[0239] Preferably, the system also includes:

[0240] The evaluation result output module is used to output the evaluation results, showing the impact of distributed power source access on distribution network line losses.

[0241] Preferably, the data acquisition module includes:

[0242] The initial data acquisition submodule is used to acquire initial data on the impact of distributed power source access on distribution network line losses;

[0243] The data preprocessing submodule is used to preprocess the initial data to obtain data on the impact of distributed power source 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] Distribution network topology data includes one or more of the following: connection relationship data between nodes, lines, and transformers in the distribution network, distribution network parameter data, and distribution network operating status information;

[0246] Distributed power source data includes one or more of the following: data on the location of the distributed power source, capacity data, type data, operating status data, and output power data;

[0247] Historical operating 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 performs preprocessing on the initial data, including one or more of the following: data cleaning, data transformation, data standardization, and feature extraction;

[0250] Data cleaning is used to remove duplicate, erroneous, or outlier data, fill in missing values ​​in 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 according to the requirements of the calculation model of the impact of distributed power generation on the line loss of the distribution network, so as to obtain data with a unified format.

[0252] Data standardization is used to standardize data to conform to a specific distribution pattern, thereby obtaining standardized data.

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

[0254] Example 3:

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

[0256] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in a readable storage medium to implement the corresponding method flow or corresponding function, so as to realize the steps of the method for calculating the impact of distributed power source access on distribution network line loss in the above embodiments.

[0257] Example 4:

[0258] Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the readable storage medium here can include both the built-in storage medium of the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the storage medium to implement the steps of the method for calculating the impact of distributed power source access on distribution network line losses in the above embodiments.

[0259] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied 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] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0261] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0262] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function 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 and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they 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 scope of protection of the claims pending approval.

Claims

1. A method for measuring and calculating the influence of distributed power access on power distribution network line loss, characterized in that, The method comprises: obtaining data of the influence of distributed power access on line loss of a power distribution network; solving a calculation model of the influence of distributed power access on line loss of the power distribution network considering a reverse power transmission factor based on an optimization algorithm and the data of the influence of distributed power access on line loss of the power distribution network, to obtain an evaluation result of the influence of distributed power access on line loss of the power distribution network; wherein, the solving of the calculation model of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission factor based on the optimization algorithm and the data of the influence of distributed power access on line loss of the power distribution network, to obtain the evaluation result of the influence of distributed power access on line loss of the power distribution network, comprises: obtaining an initial calculation result of the influence of distributed power access on line loss of the power distribution network based on the data of the influence of distributed power access on line loss of the power distribution network, using the calculation model of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission factor; optimizing the value of the reverse power transmission factor based on the initial calculation result, using an optimization algorithm, to obtain an optimized calculation model of the influence of distributed power access on line loss of the power distribution network; outputting the evaluation result of the influence of distributed power access on line loss of the power distribution network using the optimized calculation model of the influence of distributed power access on line loss of the power distribution network; the reverse power transmission factor comprises a reverse power transmission amount and / or a reverse power transmission amount proportion; when the reverse power transmission factor comprises a reverse power transmission amount, the construction process of the calculation model of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission factor comprises: determining a substation line loss consumption reduction amount expression according to the product of consumption power of each grid-connected voltage level and voltage layer loss rate of the corresponding grid-connected voltage level; determining a substation line loss reverse transmission increase amount expression according to the product of reverse power transmission amount of each grid-connected voltage level and voltage layer loss rate of the corresponding grid-connected voltage level; Based on the expression for the reduced power consumption due to zoned line loss and the expression for the increased power consumption due to reverse power transmission in zoned line loss, an expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss is determined. Based on the expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss and the zoned line loss judgment strategy, a calculation model for the impact of distributed power generation considering reverse power transmission on distribution network line loss is determined. The expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss is as follows: The partition line loss judgment strategy is as follows: when When the value is greater than 0, the impact of distributed generation access on the distribution network's zonal line losses increases; when When the value equals 0, the impact of distributed generation access on the distribution network's zonal line losses remains unchanged; when... When the value is less than 0, the impact of distributed generation access on the distribution network's regional line losses is reduced; among which, This refers to the power consumption at a grid connection voltage level of 0.4KV. For voltage level drop loss above 0.4kV grid connection voltage, This refers to the amount of electricity consumed at the 10kV grid-connected voltage level. For voltage level drop loss of 10kV grid connection voltage level and above, The reverse power transmission is for a 0.4kV grid-connected voltage level. For a grid-connected voltage level of 0.4kV, the voltage level drop loss rate is... This refers to the reverse power transmission at a 10kV grid-connected voltage level. For the voltage level voltage grading loss rate of 10kV grid-connected voltage, The calculation results are to account for the impact of distributed generation access on distribution network line losses, taking into account the reverse power transmission.

2. The method of claim 1, wherein, when the reverse power transmission factor comprises a reverse power transmission amount proportion, the construction process of the calculation model of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission factor comprises: determining a voltage layer loss rate proportion expression of each grid-connected voltage level above a voltage layer according to voltage layer loss rate of each grid-connected voltage level and voltage layer loss rate of the corresponding grid-connected voltage level above a voltage layer; determining a reverse power transmission amount proportion expression of each grid-connected voltage level according to reverse power transmission amount and consumption power of each grid-connected voltage level; determining an expression of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission amount proportion according to operation of the reverse power transmission amount proportion expression of each grid-connected voltage level and the voltage layer loss rate proportion expression of each grid-connected voltage level above a voltage layer; determining the calculation model of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission amount proportion according to the expression of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission amount proportion and a voltage layer loss judgment strategy; wherein, the expression of the influence of distributed power access on line loss of the power distribution network considering the reverse power transmission amount proportion is as follows: the voltage layer loss judgment strategy is as follows: When When the distributed power supply is connected, the voltage grade of the distribution network is changed, and the voltage grade of the distribution network is changed. When When equal to 0, the distributed power access has no effect on the voltage grading line loss of the grid-connected voltage level; When When the distributed power supply access has a negative impact on the voltage grading of the distribution network, the impact is reduced. is the proportion of the reverse power supply of the grid-connected voltage level, is the voltage layer distribution loss rate of the grid-connected voltage level and above, is the voltage layer distribution loss rate of the grid-connected voltage level, is the calculation result of the influence of the distributed power supply access considering the proportion of the reverse power supply on the distribution network line loss.

3. The method of claim 1, wherein, after obtaining the evaluation result of the influence of distributed power access on line loss of the power distribution network, the method further comprises: outputting the evaluation result for displaying the influence result of distributed power access on line loss of the power distribution network.

4. The method of claim 1, wherein, the obtaining of the data of the influence of distributed power access on line loss of the power distribution network comprises: Obtain initial data of the influence of distributed power supply access on line loss of a distribution network; Preprocess the initial data to obtain data of the influence of distributed power supply access on line loss of a distribution network.

5. The method of claim 4, wherein, The initial data of the influence of distributed power supply access on line loss of a distribution network comprises 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 comprises one or more of the following: connection relationship data among nodes, lines, and transformers of the distribution network, distribution network parameter data, and distribution network operation state information. The distributed power supply data comprises one or more of the following: access location data, capacity data, type data, operation state data, and output power data of the distributed power supply. The historical operation data comprises one or more of the following: historical load data, voltage and current data, and power factor of the distribution network. The environmental meteorological data comprises one or more of the following: wind speed, wind direction, solar radiation, air temperature, and air humidity.

6. The method of claim 5, wherein, The preprocessing of the initial data comprises one or more of the following: data cleaning, data conversion, data standardization, and feature extraction. The data cleaning is used to remove duplicate, erroneous, or abnormal data, fill in missing values of the removed data, and perform smoothing processing on the data after filling in the missing values to reduce data noise. The data conversion is used to perform format conversion or encoding on the data according to requirements of a calculation model of the influence of distributed power supply access on line loss of a distribution network, to obtain data with unified format. The data standardization is used to perform standardization processing on the data according to a specific distribution rule, to obtain standardized data. The feature extraction is used to extract feature data related to the influence of distributed power supply access on line loss of a distribution network, the feature data comprising one or more of the following: grid-connected voltage level of the distributed power supply, voltage division line loss rate value of each grid-connected voltage level, and consumption power value of each grid-connected voltage level.

7. A system for measuring and calculating the impact of distributed power access on power distribution network line loss, characterized in that, The method comprises the following steps: A data acquisition module is configured to acquire data of the influence of distributed power supply access on line loss of a distribution network. An evaluation result acquisition module is configured to solve a model of the influence of distributed power supply access on line loss of a distribution network considering a reverse power transmission factor based on an optimization algorithm and the data of the influence of distributed power supply access on line loss of a distribution network, to obtain an evaluation result of the influence of distributed power supply access on line loss of a distribution network. The evaluation result of the influence of the distributed power supply access on the line loss of the power distribution network is obtained by solving the calculation model of the influence of the distributed power supply access on the line loss of the power distribution network based on an optimization algorithm and a distributed power supply access, and includes the following steps: based on the data of the influence of the distributed power supply access on the line loss of the power distribution network, the initial calculation result of the influence of the distributed power supply access on the line loss of the power distribution network is obtained by using the calculation model of the influence of the distributed power supply access on the line loss of the power distribution network considering the reverse power transmission factor; based on the initial calculation result, the value of the reverse power transmission factor is optimized by using an optimization algorithm, and the optimized calculation model of the influence of the distributed power supply access on the line loss of the power distribution network is obtained; the evaluation result of the influence of the distributed power supply access on the line loss of the power distribution network is output by using the optimized calculation model of the influence of the distributed power supply access on the line loss of the power distribution network; the reverse power transmission factor includes the reverse power transmission amount and / or the reverse power transmission amount proportion; When the reverse power transmission factor includes the reverse power transmission amount, the construction process of the calculation model of the influence of the distributed power supply access on the line loss of the power distribution network considering the reverse power transmission factor includes: determining a substation line loss consumption reduction power amount expression according to the product of the consumption power amount of each grid-connected voltage level and the voltage layer loss rate of the corresponding grid-connected voltage level; determining a substation line loss reverse power transmission increase power amount expression according to the product of the reverse power transmission amount of each grid-connected voltage level and the voltage layer loss rate of the corresponding grid-connected voltage level; Based on the expression for the reduced power consumption due to zoned line loss and the expression for the increased power consumption due to reverse power transmission in zoned line loss, an expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss is determined. Based on the expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss and the zoned line loss judgment strategy, a calculation model for the impact of distributed power generation considering reverse power transmission on distribution network line loss is determined. The expression for the impact of distributed power generation considering reverse power transmission on distribution network line loss is as follows: The partition line loss judgment strategy is as follows: when When the value is greater than 0, the impact of distributed generation access on the distribution network's zonal line losses increases; when When the value equals 0, the impact of distributed generation access on the distribution network's zonal line losses remains unchanged; when... When the value is less than 0, the impact of distributed generation access on the distribution network's regional line losses is reduced; among which, This refers to the power consumption at a grid connection voltage level of 0.4KV. For voltage level drop loss above 0.4kV grid connection voltage, This refers to the amount of electricity consumed at the 10kV grid-connected voltage level. For voltage level drop loss of 10kV grid connection voltage level and above, The reverse power transmission is for a 0.4kV grid-connected voltage level. For a grid-connected voltage level of 0.4kV, the voltage level drop loss rate is... This refers to the reverse power transmission at a 10kV grid-connected voltage level. For the voltage level voltage grading loss rate of 10kV grid-connected voltage, The calculation results are to account for the impact of distributed generation access on distribution network line losses, taking into account the reverse power transmission.

Images