Transformer area network loss analysis method, system, equipment and medium

Abstract

The invention provides a transformer area network loss analysis method, system and device and a medium. The method comprises the steps that a simulation analysis model is established based on various collected data containing distributed power sources in a transformer area; based on each accessible position of the distributed power supply, performing power flow simulation calculation by using the simulation analysis model to obtain a simulation result of each access position; and respectively calculating the transformer area network loss corresponding to each access position based on the simulation result of each access position. According to the invention, through load flow calculation, the phase angle information of voltage and current and the problems of nonlinear load and three-phase imbalance caused by access of the distributed power supply can be comprehensively considered, so that a network loss analysis result can be accurately and comprehensively provided, and meanwhile, the calculation efficiency is also improved.

Description

Technical Field

[0001] The present invention relates to the field of network loss in a transformer area, and in particular to a method, system, equipment and medium for analyzing network loss in a transformer area. Background Art

[0002] With the rapid development of renewable energy technology and the continuous changes in the power system structure, the access of distributed power sources (such as solar energy, wind energy and other renewable energy power generation equipment) to the power system is becoming more and more common. The access of these distributed power sources not only changes the traditional power structure, but also significantly changes the power flow distribution, load characteristics and network loss of the power system.

[0003] Traditional network loss analysis methods are mainly designed based on fixed load and linear load conditions. Their accuracy and applicability are challenged by problems such as nonlinear load, bidirectional flow of power flow, and three-phase imbalance caused by the access of distributed power sources.

[0004] The existing regional network loss analysis method considering the impact of distributed generation access has the following disadvantages:

[0005] First, the traditional power flow calculation method has limited ability to handle nonlinear loads, bidirectional power flow, and three-phase imbalance when dealing with complex power systems, especially after the distributed power generation is connected. This may affect the accuracy of the calculation results and fail to truly reflect the network loss in the back-end area after the distributed power generation is connected.

[0006] Second, traditional methods usually require a large number of operating parameters as input, including voltage, current, power factor, etc. However, in practical applications, it may be very difficult to obtain these parameters, especially with the continuous development of distribution networks, the network structure is becoming more and more complex, and the acquisition of corresponding operating parameters becomes more difficult. This limits the applicability of traditional methods in practical applications.

[0007] Third, traditional power flow calculation methods also have shortcomings in terms of convergence and computational efficiency. When dealing with large-scale power systems or complex network structures, the calculation process may become very time-consuming and may even fail to converge to the correct solution. This not only affects the practicality of the calculation, but may also lead to inaccurate analysis results.

[0008] Fourth, existing technologies often ignore the dynamic impact of distributed power access on the grid loss of the substation. In fact, the output of distributed power will change with time, weather and other factors, which may cause the grid loss of the substation to change in real time. However, traditional methods can usually only perform static analysis and cannot reflect this dynamic change in real time.

[0009] It can be seen that the commonly used solutions in the prior art are based on improved versions of traditional power flow calculation methods, which attempt to simulate and analyze the power system after the access of distributed power sources by introducing more complex mathematical models and algorithms. These methods may include power flow calculation methods that consider voltage and current phase angles, and network loss analysis techniques that can handle nonlinear loads and three-phase imbalance. However, these traditional improved methods still have some limitations, such as high computational complexity, poor convergence, and limited adaptability to the access of distributed power sources, and cannot provide accurate and comprehensive network loss analysis results. Summary of the invention

[0010] In order to solve the problem that the prior art cannot provide accurate and comprehensive network loss analysis results, the present invention proposes a network loss analysis method for a substation, comprising:

[0011] Establish a simulation analysis model based on the collected data of distributed power sources in the substation area;

[0012] Based on each location where the distributed power source can be connected, the simulation analysis model is used to perform power flow simulation calculations to obtain simulation results for each access location;

[0013] Based on the simulation results of each access location, the network loss of the substation corresponding to each access location is calculated respectively.

[0014] Optionally, the various data of the distributed power source in the substation area include: user information, line loss information, distributed power source information, substation area network structure and monitoring data;

[0015] The distributed power source information includes: the capacity, type and operation mode of the distributed power source;

[0016] The user information includes: user type, power load, and power usage habits;

[0017] The line loss information includes: historical line loss data and real-time line loss data;

[0018] The substation network structure: topological relationship and line impedance of the power supply network;

[0019] The monitoring data includes: electrical parameters, real-time data of distributed power sources and real-time change data of load in the substation area;

[0020] The electrical parameters include: voltage, current, and power factor within the substation;

[0021] The real-time data of the distributed power source includes real-time output power, voltage, and current;

[0022] The real-time change data of the substation load includes: total load and load of each branch.

[0023] Optionally, the power flow simulation calculation is performed using the simulation analysis model at each accessible location of the distributed power source to obtain a simulation result of each access location, including:

[0024] Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model.

[0025] Based on the starting power and the set starting voltage, the voltage drop is calculated step by step from the starting end to the end until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained.

[0026] Optionally, the voltage of the node is calculated as follows:

[0027]

[0028] In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

[0029] Optionally, the set convergence condition is as shown in the following formula:

[0030] |V i (k) -V i (k-1) |<ε

[0031] Where V i (k) is the voltage of node i at the kth iteration, V i (k-1) is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

[0032] Optionally, the current is calculated as follows:

[0033]

[0034] In the formula, is the current of node i in the kth iteration, V i (k-1) is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

[0035] Optionally, the calculating the area network loss corresponding to each access location based on the simulation result of each access location respectively includes:

[0036] Calculate the system losses between the power source and the distributed generation based on the system single-phase resistivity, the distance from the power source to the distributed generation, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed generation, the active power output by the distributed generation, and the phase voltage on the system transmission line;

[0037] Calculate the transmission line losses between the distributed generation and the load based on the system single-phase resistivity, the distance from the source to the load, the distance from the source to the distributed generation, the active power consumed by the load, the phase voltage on the system transmission line, and the reactive power consumed by the load;

[0038] The network loss of the substation is the sum of the system loss between the power source and the distributed power source and the transmission line loss between the distributed power source and the load.

[0039] Optionally, the system loss between the power source and the distributed power source is calculated based on the system single-phase resistivity, the distance from the power source to the distributed power source, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed power source, the active power output by the distributed power source and the phase voltage on the system transmission line, including:

[0040] Calculating system load based on active power consumed by the load and reactive power consumed by the load;

[0041] Calculating a single-phase current flowing into the load based on the system load and the phase voltage on the system transmission line;

[0042] Based on the system single-phase resistivity, the distance from the power source to the distributed power source and the single-phase current flowing into the load combined with the first loss calculation formula, the system loss between the power source and the distributed power source is obtained.

[0043] Optionally, the first loss calculation formula is as follows:

[0044]

[0045] Where, L sg : Transmission line loss between power source and distributed generation in model II, r is the single-phase resistivity of the system, I s : Power supply output single-phase current, G: Distance from power supply to distributed power supply, P l : Active power consumed by the load, Q l : Reactive power consumed by the load, P g : Active power output of distributed power supply, Q g : The active power output by the distributed generation, V is the phase voltage on the system transmission line.

[0046] Optionally, the transmission line loss between the distributed power source and the load is calculated as follows:

[0047]

[0048] Where, L gl : Transmission line loss between distributed generation and load in model II; r is the system single-phase resistivity; L: distance from the power source to the load; G: distance from the power source to the distributed generation; I l : Single-phase current flowing into the load; P l : Active power consumed by the load; Q l : Reactive power consumed by the load; V is the phase voltage on the system transmission line.

[0049] Optionally, after respectively calculating the area network loss corresponding to each access location based on the simulation result of each access location, the method further includes:

[0050] The access location corresponding to the minimum grid loss in the substation is used as the access location of the distributed generation to optimize the power system.

[0051] In another aspect, the present invention further provides a system for analyzing network loss in a substation area, comprising:

[0052] A model building module is used to establish a simulation analysis model of distributed power sources and substations based on the collected data of various distributed power sources in the substations;

[0053] A simulation module, for performing power flow simulation calculations using the simulation analysis model based on each location where the distributed power source can be connected, and obtaining simulation results for each access location;

[0054] The network loss calculation module is used to calculate the network loss of the substation corresponding to each access location based on the simulation results of each access location.

[0055] Optionally, the various data of the distributed power source in the substation area include: user information, line loss information, distributed power source information, substation area network structure and monitoring data;

[0056] The distributed power source information includes: the capacity, type and operation mode of the distributed power source;

[0057] The user information includes: user type, power load, and power usage habits;

[0058] The line loss information includes: historical line loss data and real-time line loss data;

[0059] The substation network structure: topological relationship and line impedance of the power supply network;

[0060] The monitoring data includes: electrical parameters, real-time data of distributed power sources and real-time change data of load in the substation area;

[0061] The electrical parameters include: voltage, current, and power factor within the substation;

[0062] The real-time data of the distributed power source includes real-time output power, voltage, and current;

[0063] The real-time change data of the substation load includes: total load and load of each branch.

[0064] Optionally, the simulation module is specifically used for:

[0065] Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model.

[0066] Based on the starting power and the set starting voltage, the voltage drop is calculated step by step from the starting end to the end until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained.

[0067] Optionally, the voltage of the node is calculated as follows:

[0068]

[0069] In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

[0070] Optionally, the set convergence condition is as shown in the following formula:

[0071] |V i (k) -V i (k-1) |<ε

[0072] Where V i (k) is the voltage of node i at the kth iteration, V i (k-1) is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

[0073] Optionally, the current is calculated as follows:

[0074]

[0075] In the formula, is the current of node i in the kth iteration, V i (k-1) is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

[0076] Optionally, the network loss calculation module includes:

[0077] A system loss calculation submodule, for calculating the system loss between the power source and the distributed power source based on the system single-phase resistivity, the distance from the power source to the distributed power source, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed power source, the active power output by the distributed power source, and the phase voltage on the system transmission line;

[0078] The transmission line loss calculation submodule is used to calculate the transmission line loss between the distributed power source and the load based on the system single-phase resistivity, the distance from the power source to the load, the distance from the power source to the distributed power source, the active power consumed by the load, the phase voltage on the system transmission line, and the reactive power consumed by the load;

[0079] The summing submodule is used to take the sum of the system loss between the power source and the distributed power source and the transmission line loss between the distributed power source and the load as the substation network loss.

[0080] Optionally, the system loss calculation submodule is specifically used for:

[0081] Calculating system load based on active power consumed by the load and reactive power consumed by the load;

[0082] Calculating a single-phase current flowing into the load based on the system load and the phase voltage on the system transmission line;

[0083] Based on the system single-phase resistivity, the distance from the power source to the distributed power source and the single-phase current flowing into the load combined with the first loss calculation formula, the system loss between the power source and the distributed power source is obtained.

[0084] Optionally, the first loss calculation formula is as follows:

[0085]

[0086] Where, L sg : Transmission line loss between power source and distributed generation in model II, r is the single-phase resistivity of the system, I s : Power supply output single-phase current, G: Distance from power supply to distributed power supply, P l : Active power consumed by the load, Q l : Reactive power consumed by the load, P g : Active power output of distributed power supply, Q g: The active power output by the distributed generation, V is the phase voltage on the system transmission line.

[0087] Optionally, the transmission line loss between the distributed power source and the load is calculated as follows:

[0088]

[0089] Where, L gl : Transmission line loss between distributed generation and load in model II; r is the system single-phase resistivity; L: distance from the power source to the load; G: distance from the power source to the distributed generation; I l : Single-phase current flowing into the load; P l : Active power consumed by the load; Q l : Reactive power consumed by the load; V is the phase voltage on the system transmission line.

[0090] Optionally, it also includes: an optimization module, which is used to use the access location corresponding to the minimum area network loss as the access location of the distributed power source to optimize the power system.

[0091] In another aspect, the present application further provides a computing device, comprising: at least one processor and a memory;

[0092] The memory is used to store one or more programs;

[0093] When the one or more programs are executed by the at least one processor, a substation network loss analysis method as described above is implemented.

[0094] On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, a substation network loss analysis method as described above is implemented.

[0095] Compared with the prior art, the present invention has the following beneficial effects:

[0096] The present invention provides a method for analyzing network loss in a substation, including: establishing a simulation analysis model based on a variety of data collected from a substation containing distributed power sources; performing flow simulation calculations based on each location where the distributed power source can be connected, and obtaining simulation results for each access location; and calculating the network loss of the substation corresponding to each access location based on the simulation results for each access location. Through flow calculation, the present invention can fully consider the phase angle information of voltage and current, as well as the nonlinear load and three-phase imbalance caused by the access of distributed power sources, and can thus accurately and comprehensively provide network loss analysis results, while also improving calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 A flow chart of a method for analyzing network loss in a transformer area according to the present invention;

[0098] Figure 2 It is a schematic diagram of the active power ratio of the distributed power source and the load of the present invention;

[0099] Figure 3 A specific flow chart of a method for analyzing network loss in a substation area according to the present invention;

[0100] Figure 4 The figure is a schematic diagram of the structure of a computer device of the present invention. DETAILED DESCRIPTION

[0101] In view of the shortcomings of the existing technology, the present invention proposes a method for analyzing the network loss of the substation area, which aims to complete the calculation and analysis of the substation area network loss by introducing advanced power grid simulation analysis software, combining the flow method calculation and distributed power supply access optimization, and solve the shortcomings of the existing technology in the analysis of substation area network loss in terms of accuracy, parameter acquisition, calculation efficiency, convergence and dynamic analysis, and provide a more advanced, accurate and practical technical solution for the analysis of network loss in the back-end area after the distributed power supply is connected. The full name of DG in this article is distributed generation, which refers to distributed power supply.

[0102] Embodiment 1:

[0103] The present invention proposes a method for analyzing network loss in a substation area, such as Figure 1 As shown, including:

[0104] Step S1: establishing a simulation analysis model based on various data collected on distributed power sources in the substation;

[0105] Step S2: Based on each location where the distributed power source can be connected, respectively use the simulation analysis model to perform power flow simulation calculation to obtain a simulation result for each access location;

[0106] Step S3: Calculate the network loss of the substation area corresponding to each access location based on the simulation results of each access location.

[0107] The technical solution of the present invention is further introduced below.

[0108] The network loss analysis method considering the access of distributed power sources to the substation area is a comprehensive power system analysis method, which combines the accuracy of power flow calculation and the characteristics of the access of distributed power sources to the substation area, and aims to accurately evaluate the impact of the access of distributed power sources on the substation area network loss. Figure 3 The main steps of this analysis method are introduced:

[0109] In the area network loss analysis method, data collection is a crucial link, which involves multiple aspects to ensure that the impact of distributed power access on the area line loss can be fully and accurately assessed. The following are some key steps and considerations for data collection:

[0110] Data collection includes: basic information data, real-time monitoring data, operation data records, metering system data, etc. Details include:

[0111] User information: including user type, power load, power usage habits, etc.

[0112] Line loss information: historical line loss data, real-time line loss data, etc.

[0113] Distributed power supply information: access location, capacity, type, operation mode, etc.

[0114] Substation network structure: topological relationship of the power supply network, line impedance, etc.

[0115] Real-time monitoring data: electrical parameters such as voltage, current, power factor, etc. within the substation, real-time output power, voltage, current and other data of distributed power sources, real-time change data of substation load, including total load, branch load, etc.

[0116] Step S1: Establish a simulation analysis model based on the collected data of distributed power sources in the substation, including:

[0117] Firstly, according to the collected data, the distributed power supply model and the substation model are established respectively, and then the distributed power supply model and the substation model together constitute the simulation analysis model.

[0118] The following is a detailed introduction to the construction of distributed power supply model and the construction of substation model:

[0119] Based on the collected multi-source data and the existing simulation analysis model of the system, a detailed distributed power model and substation model are established. The distributed power model should include information such as its capacity, output characteristics, and access location; the substation model includes line parameters, load distribution, transformer parameters, etc. within the substation. These models will serve as the basis for power flow calculations.

[0120] Step S2: Based on each location where the distributed generation can be connected, respectively use the simulation analysis model to perform power flow simulation calculations to obtain simulation results for each access location, including:

[0121] Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model.

[0122] Based on the starting power and the set starting voltage, the voltage drop is calculated step by step from the starting end to the end until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained.

[0123] Optionally, the voltage of the node is calculated as follows:

[0124]

[0125] In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

[0126] Optionally, the set convergence condition is as shown in the following formula:

[0127] |V i (k) -V i (k-1) |<ε

[0128] Where V i (k) is the voltage of node i at the kth iteration, V i (k-1) is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

[0129] Optionally, the current is calculated as follows:

[0130]

[0131] In the formula, is the current of node i in the kth iteration, V i (k-1) is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

[0132] The specific contents of the power flow calculation involved in step S2 are as follows:

[0133] Power flow calculation refers to the calculation of the distribution of active power, reactive power and voltage in the power grid under the given power system network topology, component parameters and power generation and load parameters. It determines the steady-state operating state parameters of each part of the power system based on the given power grid structure, parameters and operating conditions of components such as generators and loads.

[0134] Based on the established distributed power model and substation model, i.e., the simulation analysis model, the power flow calculation is performed. The power flow calculation can fully consider the phase angle information of voltage and current, so as to more accurately simulate the power flow distribution in the substation after the distributed power source is connected. Through iterative calculation, the voltage, current and power distribution of each node in the substation are obtained. It is suitable for the theoretical line loss calculation of the substation with multiple power sources including distributed power sources. In the calculation, when starting from the end to the beginning, the voltage of the entire network is assumed to be the rated voltage, and only the power loss in each component is calculated without calculating the voltage drop; after the starting power is obtained, the voltage drop is calculated section by section from the beginning to the end using the given starting voltage and the obtained starting power, and this is repeated until the convergence condition is met or the number of calculations is reached. The beginning and end here refer to the voltage input and output ends, and any point between the input and output ends is a node.

[0135] Calculate the operating data required: distribution transformer P, Q, and distribution line U.

[0136] Calculate branch current:

[0137]

[0138] In the formula, is the current of node i in the kth iteration, V i (k-1) is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

[0139] Calculate the node voltage:

[0140] V L2 (k) =V L1 (k) -Z L J L (K)

[0141] In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

[0142] Convergence conditions:

[0143] |V i (k) -V i (k-1) |<ε

[0144] Where Vi (k) is the voltage of node i at the kth iteration, V i (k-1) is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

[0145] The power flow can calculate the voltage of each node and the current of each branch. For substations with conditions, the system loss can be calculated by forward-backward substitution method.

[0146] Step S3: Calculate the network loss of the station area corresponding to each access location based on the simulation results of each access location, including:

[0147] Calculate the system losses between the power source and the distributed generation based on the system single-phase resistivity, the distance from the power source to the distributed generation, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed generation, the active power output by the distributed generation, and the phase voltage on the system transmission line;

[0148] Calculate the transmission line losses between the distributed generation and the load based on the system single-phase resistivity, the distance from the source to the load, the distance from the source to the distributed generation, the active power consumed by the load, the phase voltage on the system transmission line, and the reactive power consumed by the load;

[0149] The network loss of the substation is the sum of the system loss between the power source and the distributed power source and the transmission line loss between the distributed power source and the load.

[0150] Optionally, the system loss between the power source and the distributed power source is calculated based on the system single-phase resistivity, the distance from the power source to the distributed power source, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed power source, the active power output by the distributed power source and the phase voltage on the system transmission line, including:

[0151] Calculating system load based on active power consumed by the load and reactive power consumed by the load;

[0152] Calculating a single-phase current flowing into the load based on the system load and the phase voltage on the system transmission line;

[0153] Based on the system single-phase resistivity, the distance from the power source to the distributed power source and the single-phase current flowing into the load combined with the first loss calculation formula, the system loss between the power source and the distributed power source is obtained.

[0154] The first loss calculation formula is as follows:

[0155]

[0156] Where, L sg: Transmission line loss between power source and distributed generation in model II, r is the single-phase resistivity of the system, I s : Power supply output single-phase current, G: Distance from power supply to distributed power supply, P l : Active power consumed by the load, Q l : Reactive power consumed by the load, P g : Active power output of distributed power supply, Q g : The active power output by the distributed generation, V is the phase voltage on the system transmission line.

[0157] Optionally, the transmission line loss between the distributed power source and the load is calculated as follows:

[0158]

[0159] Where, L gl : Transmission line loss between distributed generation and load in model II; r is the system single-phase resistivity; L: distance from the power source to the load; G: distance from the power source to the distributed generation; I l : Single-phase current flowing into the load; P l : Active power consumed by the load; Q l : Reactive power consumed by the load; V is the phase voltage on the system transmission line.

[0160] The specific contents of network loss calculation and analysis in step S3 are as follows:

[0161] According to the results of the power flow calculation, the network loss of the substation is calculated. The network loss can be obtained by calculating the power loss of the line and transformer. Then, the network loss is analyzed, including the distribution, size and change trend of the network loss. In particular, the change of network loss before and after the distributed power source is connected can be paid attention to in order to evaluate the impact of the distributed power source on the network loss of the substation.

[0162] The present invention provides a method for analyzing network loss in an electric substation area, and further includes: using the access position corresponding to the minimum network loss in the electric substation area as the access position of the distributed power source to optimize the power system.

[0163] Distributed power access optimization, the specific steps are as follows:

[0164] Based on the results of network loss analysis, the access location and capacity of distributed power sources can be optimized. By adjusting the access location and capacity of distributed power sources, the network loss of the substation area can be further reduced. Various factors can be considered in the optimization process, such as economic efficiency and technical feasibility.

[0165] The present invention mainly provides important support for the planning, operation and optimization of power systems. The following are the main technical problems that this method can solve:

[0166] Accurate assessment of the impact of distributed power generation access on the grid loss of the substation: Traditional power flow calculation methods often ignore the phase angle information of voltage and current, resulting in inaccurate calculation of the grid loss of the substation after the distributed power generation access. The power flow calculation-based method can fully consider the phase angle changes of voltage and current, thereby more accurately assessing the impact of distributed power generation access on the grid loss of the substation.

[0167] Optimal selection of the access location of distributed power sources: The access location of distributed power sources has a significant impact on the network loss of the substation area. Through power flow calculation, the impact of different access locations on network loss can be analyzed, so as to optimize the selection of access locations and reduce the network loss of the substation area.

[0168] Reasonable configuration of distributed power capacity: The capacity of distributed power is directly related to its output capacity and its impact on the grid loss of the substation. Based on the flow calculation, the impact of distributed power on the grid loss of the substation under different capacity configurations can be analyzed to provide a basis for the reasonable configuration of capacity.

[0169] Network loss analysis considering three-phase imbalance: The access of distributed power sources may lead to aggravated three-phase imbalance in the substation area, thereby increasing network losses. Power flow calculation can take these factors into account, provide more accurate network loss analysis results, and help formulate corresponding solutions.

[0170] Real-time dynamic network loss analysis: The operating status of the power system changes in real time, and the output of distributed power sources may also change with time, weather and other factors. The method based on power flow calculation can realize real-time dynamic analysis of the network loss in the substation area, providing support for real-time dispatch and optimization of the power system.

[0171] Example 2

[0172] Whether it is a radial distribution network system in rural or suburban areas, or a mesh distribution network system in cities, they are all designed based on the fact that there is no power supply connected to the distribution network system and the user side. After the distributed energy is connected near the load of the distribution network, the load distribution of the entire distribution network will change, and the system flow will change accordingly. The flow of the distribution network may also change from the original "one-way" flow to "two-way" flow. If the distributed power source is connected to the distribution network in the form of a synchronous generator, since the synchronous generator can input active power and reactive power to the system at the same time, the reactive power it generates can reduce system losses and support the voltage of the distribution network; but for the asynchronous induction generator method, since the generator needs to absorb reactive power from the system while inputting active power to the system, it will reduce the power factor of the power grid.

[0173] The introduction of distributed generators into the distribution network may reduce or increase system losses, but in general, one of the main positive effects of distributed power sources injected into the distribution network is to reduce network losses.

[0174] Model I in this embodiment is a distributed power source model, and model II is a substation model that uses the distributed power source as a power output point.

[0175] (1) Impact of distributed generation access parameters on network losses

[0176] If the system load is:

[0177] S l =P l +jQ l

[0178] In the formula, S l is the system load, j is the imaginary unit, P l is the active power consumed by the load, Q l Reactive power consumed by the load.

[0179] Single-phase current I flowing into the load l It can be expressed as:

[0180]

[0181] Where V is the phase voltage on the system transmission line.

[0182] For Model I, the system loss is:

[0183]

[0184] Where, L0: Model I system network loss, r: System single-phase resistivity, Ω / Km, I l : Single-phase current flowing into the load, L: The distance from the power supply to the load, in km.

[0185] For Model II, the phase current output by the distributed generation is:

[0186]

[0187] In the formula, I g : Distributed power supply output single-phase current, unit A, P g : Active power output of distributed power supply, unit W, Q g : The active power output by the distributed generation, in Var, where V is the phase voltage on the system transmission line.

[0188] After the introduction of distributed power sources, the losses on the feeder can be divided into two parts according to their access position in the system: the first part is the system loss L between the power source and the distributed power source. sg The second part is the system loss L between distributed generation and load gl .

[0189] For the first part of the loss, the system loss L between the power supply and the distributed generation sg . It can be concluded that:

[0190] I s =I l -I g

[0191]

[0192] In the formula, I s : Power supply output single-phase current, I l : Single-phase current flowing into the load, I g : Distributed power supply output single-phase current, L sg : Transmission line loss between power source and distributed generation in Model II, unit is W, r: System single-phase resistivity, Ω / Km, G: Distance from power source to distributed generation, km, P l : Active power consumed by the load, in W, Q l : Reactive power consumed by the load, in Var, P g : Active power output of distributed power supply, in W, Q g : Active power output by distributed generation, in Var.

[0193] For the second part of the loss, due to the load side current I before and after the distributed power supply is connected l No change, so after the introduction of distributed power generation, L gl It is the same as before the introduction of distributed power generation.

[0194]

[0195] L dg =L sg +L gl

[0196] Where, L gl : Transmission line loss between distributed generation and load in model II, unit is W; r: System single-phase resistivity, Ω / Km; L: Distance from power source to load, km; G: Distance from power source to distributed generation, km; I l : Single-phase current flowing into the load, A; P l : Active power consumed by the load, W; Q l : Reactive power consumed by the load, Var; L dg : Model II system network loss, W; L sg : Transmission line loss between the power source and distributed generation in Model II, W.

[0197] Compare the network loss change L after connecting to distributed power sources r :

[0198]

[0199] Where, L0: network loss of model I system, L dg : Model II system network loss, G: distance from power source to distributed generation, R: system single-phase resistance, V: phase voltage on system transmission line, L: distance from power source to load, P l : Active power consumed by the load, P g : Active power output of distributed power generation, Q g : Active power output of distributed power supply, Q l : Reactive power consumed by the load.

[0200] From the above formula, we can see that the network loss change L r If the sign is positive, it means that the introduction of distributed power sources can reduce network losses. Otherwise, it means that the introduction of distributed power sources increases system losses.

[0201] The impact of distributed generation access location on network losses.

[0202] The access position of distributed generation (DG) has a great influence on the network loss of the distribution network. Three positions X = 1 / 2, 1 / 3 and 2 / 3 (i.e. DG is located in the middle of the feeder, 1 / 3 from the head end, and 2 / 3 from the head end) are selected to connect the distributed generation to the distribution network for simulation. The simulation results are shown in the figure Figure 2 As shown:

[0203] Among them, the values ​​of Y (DG capacity relative to load) are 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2 (the same below), and the values ​​of the power factor of the distributed power source are 0.8, 0.0, and -0.8, respectively.

[0204] In the case of a certain capacity range of the distributed power source relative to the load and a certain power factor of the distributed power source, configuring the distributed power source at the end of the transmission line as close to the load as possible can greatly reduce the active power loss of the transmission line. In addition, it can be seen that when the active output of the distributed power source is less than the capacity range of the load (Y≤1), increasing the active output of the distributed power source can reduce the active power loss of the transmission line, but with the increase of the capacity of the distributed power source, the degree of reduction tends to saturation; and when the active output of the distributed power source is greater than the load capacity but less than 2 times the load capacity (1≤Y<2), increasing the active output of the distributed power source will reduce the active power loss reduction rate of the transmission line, because at this time the distributed power source not only bears the regional load, but also outputs power to the upper level grid in the opposite direction, and the current direction of the regional substation will change, that is, from the load to the power source; when the active output of the distributed power source is greater than 2 times the load capacity, increasing the active output of the distributed power source will increase the active power loss of the transmission line.

[0205] Result verification and application:

[0206] Finally, the optimization results need to be verified. This can be achieved by implementing the access scheme of distributed power generation in the actual substation and observing the changes in network loss. If the verification results are as expected, then the method can be applied to other similar substations to provide guidance for the access of distributed power generation and the reduction of substation network loss.

[0207] Compared with the prior art, the present invention has the following effects:

[0208] First, it improves the accuracy of network loss analysis. By introducing power flow calculation, the phase angle information of voltage and current can be fully considered, and the power flow distribution and network loss in the back-end area after the distributed power supply is connected can be more accurately simulated and analyzed. This helps to avoid the limitations of traditional methods in dealing with nonlinear loads, three-phase imbalance and other problems, and improve the accuracy of analysis.

[0209] Second, the parameter acquisition process is simplified and the dependence on parameters is reduced. By optimizing the model and algorithm, the dependence on a large number of operating parameters is reduced, so that network loss analysis can be performed even when parameter acquisition is difficult. This helps to improve the operability and flexibility of the present invention in practical applications.

[0210] The third is to improve the computational efficiency and convergence. By optimizing the computational process and algorithm design, the amount of computation is reduced, the computational speed is increased, and the convergence is enhanced. This enables the present invention to more efficiently process large-scale power systems or complex network structures, and improve the practicality and reliability of the analysis.

[0211] Fourth, consider the dynamic impact of distributed power access on the grid loss in the substation area. By introducing real-time data and dynamic analysis technology, the real-time dynamic monitoring and analysis of the grid loss in the substation area can be realized. This helps to timely reflect the changes in grid loss after the access of distributed power sources, and provides strong support for the real-time dispatching and optimization of the power system.

[0212] Example 3

[0213] Taking a certain area as an example, the present invention is further introduced:

[0214] The operating capacity of the substation is 315kVA, the power supply radius is 233.48m, the total length of the line segment is 1537.69m, and the power supply users are 82 households. According to the theoretical calculation of the power system, the power sales of the public transformer is 1740.28kWh, the power loss is 484.3587kWh, and the theoretical calculation result is 21.43%. The calculation daily current completeness rate is 100%, and the meter box matching rate is 100%. Its line loss rate in the same period is 7.49%, which is 13.9 percentage points different from the theoretical calculation result of the power system. The power sales is 1740.28kWh, without deviation, and the power supply is 2260.64kWh, with a deviation rate of 17.73%. The distribution of power loss of the public transformer in the substation area is as follows: meter loss 2.75kWh (0.57%), trunk line loss 481.61kWh (99.43%). The main loss of this area is concentrated in the trunk line loss. In addition, its three-phase load imbalance is 14.32%, single-phase users account for 29.51% of the electricity sales, and three-phase four-wire users account for 70.49%. A preliminary analysis of the line loss situation was conducted through the area: there are three high-loss line segments with a line loss rate higher than 7%, and the line model is JKLYJ-35, and the theoretical line loss is relatively high, so the method of the present invention is used to carry out research:

[0215] 1) Three-phase balance analysis and solution formulation: The public transformer in the substation area does not perform maintenance on the user phases, so the method of the present invention is used for relevant calculations. The substation power data is formulated according to the three-phase balance as shown in Table 1:

[0216] Table 1

[0217]

[0218]

[0219] After three-phase balancing, the theoretical line loss rate of the substation area was reduced to 5.53%, which is significantly lower than 21.43%.

[0220] 2) Access location analysis and plan formulation: According to the total power sales volume of the substation area of ​​1740.28kWh, the line segment close to the load center is: Substation area public transformer line 1 pole 1 ~ Substation area public transformer line 2 pole. This time, the power point is adjusted to "PD_14156354". After the power point adjustment is completed, the calculation is added, and the substation line loss rate is 4.71%, which is significantly lower than 21.43%.

[0221] 3) Determination of loss reduction plan: By introducing advanced power grid simulation analysis software, combined with power flow calculation and distributed power access optimization, the network loss calculation and analysis of the substation area are completed, and various measures are formulated to reduce the line loss rate of the substation area. The final loss reduction plan is determined as follows: balance the three-phase load in the substation area, and the imbalance degree of the three-phase load after balancing is 0%; adjust the power source point to the load center, the node "PD_14156354". After the final implementation, the line loss rate of the substation area was 4.71%, a decrease of 16.72 percentage points from the original 21.43%. The financial net present value is approximately 1.0772 million yuan.

[0222] First, the accuracy of network loss analysis has been significantly improved. By adopting the power flow calculation method, the phase angle information of voltage and current can be fully considered, so as to more accurately simulate and analyze the power flow distribution and network loss in the back-end area after the distributed power generation is connected. This helps to avoid the limitations of traditional methods in dealing with nonlinear loads, three-phase imbalance and other problems, and makes the network loss analysis results closer to the actual situation.

[0223] Second, the access calculation of distributed power sources has been optimized. By adjusting the capacity and access location of distributed power sources, the changes in network losses are observed, and the optimal access plan and capacity configuration are found to minimize network losses in the substation area. This not only helps improve the economy of the power system, but also reduces energy waste and promotes sustainable development.

[0224] Third, the efficiency and practicality of network loss analysis are improved. By optimizing the calculation process and algorithm design, the present invention reduces the amount of calculation, improves the calculation speed, and makes network loss analysis more efficient. At the same time, the present invention also takes into account real-time data and dynamic analysis technology, which can realize real-time dynamic monitoring and analysis of network losses in the substation area, and provide strong support for real-time dispatching and optimization of the power system.

[0225] In summary, the present invention has significant effects, can accurately evaluate the impact of distributed power access on the grid loss of the substation, optimize the access location and capacity configuration of distributed power, improve the efficiency and practicality of grid loss analysis, and promote the intelligent and automated development of the power system.

[0226] The present invention includes the detailed design and process of the measurement method, covering key steps such as the algorithm process and calculation rules. It also introduces advanced power grid simulation analysis software, combines the flow method calculation and distributed power access optimization to complete the calculation and analysis of the substation network loss, and proposes a new substation network loss analysis method that considers the impact of distributed power access; this substation network loss technical method not only improves the accuracy and efficiency of the measurement, but also provides new ideas and means for the optimized operation of the power system.

[0227] Example 4

[0228] The present invention based on the same inventive concept also provides a substation network loss analysis system, comprising:

[0229] A model building module is used to establish a simulation analysis model of distributed power sources and substations based on the collected data of various distributed power sources in the substations;

[0230] A simulation module, for performing power flow simulation calculations using the simulation analysis model based on each location where the distributed power source can be connected, and obtaining simulation results for each access location;

[0231] The network loss calculation module is used to calculate the network loss of the substation corresponding to each access location based on the simulation results of each access location.

[0232] Optionally, the various data of the distributed power source in the substation area include: user information, line loss information, distributed power source information, substation area network structure and monitoring data;

[0233] The distributed power source information includes: the capacity, type and operation mode of the distributed power source;

[0234] The user information includes: user type, power load, and power usage habits;

[0235] The line loss information includes: historical line loss data and real-time line loss data;

[0236] The substation network structure: topological relationship and line impedance of the power supply network;

[0237] The monitoring data includes: electrical parameters, real-time data of distributed power sources and real-time change data of load in the substation area;

[0238] The electrical parameters include: voltage, current, and power factor within the substation;

[0239] The real-time data of the distributed power source includes real-time output power, voltage, and current;

[0240] The real-time change data of the substation load includes: total load and load of each branch.

[0241] Optionally, the simulation module is specifically used for:

[0242] Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model.

[0243] Based on the starting power and the set starting voltage, the voltage drop is calculated step by step from the starting end to the end until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained.

[0244] Optionally, the voltage of the node is calculated as follows:

[0245]

[0246] In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

[0247] Optionally, the set convergence condition is as shown in the following formula:

[0248] |V i (k) -V i (k-1) |<ε

[0249] Where V i (k) is the voltage of node i at the kth iteration, V i (k-1) is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

[0250] Optionally, the current is calculated as follows:

[0251]

[0252] In the formula, is the current of node i in the kth iteration, V i (k-1) is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

[0253] Optionally, the network loss calculation module includes:

[0254] A system loss calculation submodule, for calculating the system loss between the power source and the distributed power source based on the system single-phase resistivity, the distance from the power source to the distributed power source, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed power source, the active power output by the distributed power source, and the phase voltage on the system transmission line;

[0255] The transmission line loss calculation submodule is used to calculate the transmission line loss between the distributed power source and the load based on the system single-phase resistivity, the distance from the power source to the load, the distance from the power source to the distributed power source, the active power consumed by the load, the phase voltage on the system transmission line, and the reactive power consumed by the load;

[0256] The summing submodule is used to take the sum of the system loss between the power source and the distributed power source and the transmission line loss between the distributed power source and the load as the substation network loss.

[0257] Optionally, the system loss calculation submodule is specifically used for:

[0258] Calculating system load based on active power consumed by the load and reactive power consumed by the load;

[0259] Calculating a single-phase current flowing into the load based on the system load and the phase voltage on the system transmission line;

[0260] Based on the system single-phase resistivity, the distance from the power source to the distributed power source and the single-phase current flowing into the load combined with the first loss calculation formula, the system loss between the power source and the distributed power source is obtained.

[0261] Optionally, the first loss calculation formula is as follows:

[0262]

[0263] Where, L sg : Transmission line loss between power source and distributed generation in model II, r is the single-phase resistivity of the system, I s : Power supply output single-phase current, G: Distance from power supply to distributed power supply, P l : Active power consumed by the load, Q l : Reactive power consumed by the load, P g : Active power output of distributed power supply, Q g : The active power output by the distributed generation, V is the phase voltage on the system transmission line.

[0264] Optionally, the transmission line loss between the distributed power source and the load is calculated as follows:

[0265]

[0266] Where, L gl: Transmission line loss between distributed generation and load in model II; r is the system single-phase resistivity; L: distance from the power source to the load; G: distance from the power source to the distributed generation; I l : Single-phase current flowing into the load; P l : Active power consumed by the load; Q l : Reactive power consumed by the load; V is the phase voltage on the system transmission line.

[0267] Optionally, it also includes: an optimization module, which is used to use the access location corresponding to the minimum area network loss as the access location of the distributed power source to optimize the power system.

[0268] Example 5

[0269] like Figure 4 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0270] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of a substation network loss analysis method considering the impact of distributed power supply access in the above-mentioned embodiment.

[0271] Example 6

[0272] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device for storing programs and data. It can be understood that the storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a method for analyzing network loss in a substation area considering the impact of distributed power access in the above embodiment.

[0273] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0274] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0275] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0276] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0277] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for analyzing network loss in a substation area, characterized in that: include: Establish a simulation analysis model based on the collected data of distributed power sources in the substation area; Based on each location where the distributed power source can be connected, the simulation analysis model is used to perform power flow simulation calculations to obtain simulation results for each access location; Based on the simulation results of each access location, the network loss of the substation corresponding to each access location is calculated respectively.

2. The method according to claim 1, characterized in that The various data of distributed power sources in the substation area include: user information, line loss information, distributed power source information, substation area network structure and monitoring data; The distributed power source information includes: the capacity, type and operation mode of the distributed power source; The user information includes: user type, power load, and power usage habits; The line loss information includes: historical line loss data and real-time line loss data; The substation network structure: topological relationship and line impedance of the power supply network; The monitoring data includes: electrical parameters, real-time data of distributed power sources and real-time change data of load in the substation area; The electrical parameters include: voltage, current, and power factor within the substation; The real-time data of the distributed power source includes: real-time output power, voltage, and current; The real-time change data of the substation load includes: total load and load of each branch.

3. The method according to claim 2, characterized in that The simulation analysis model is used to perform power flow simulation calculations at each accessible location of the distributed power source to obtain simulation results of each access location, including: Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model. Based on the starting power and the set starting voltage, the voltage drop is calculated from the starting end to the end step by step until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained; The simulation results of each access location include: power loss and starting power in each component, and voltage, current and power distribution of each node in the station area.

4. The method according to claim 3, characterized in that The voltage of the node is calculated as follows: In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

5. The method according to claim 3, characterized in that The convergence condition of the setting is as follows: In the formula, is the voltage of node i at the kth iteration, is the voltage of node i after k-1 iterations, ε is an infinitesimal quantity in the limit calculation, a number that approaches zero but is not equal to zero, i is the node number, and k is the number of iterations.

6. The method according to claim 3, characterized in that The current is calculated as follows: In the formula, is the current of node i at the kth iteration, is the voltage of node i at k-1 iterations; S i is the sum of the injected power of node i; Y i is the parallel admittance of node i.

7. The method according to claim 2, characterized in that The calculating the area network loss corresponding to each access location based on the simulation results of each access location respectively includes: Calculate the system losses between the power source and the distributed generation based on the system single-phase resistivity, the distance from the power source to the distributed generation, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed generation, the active power output by the distributed generation, and the phase voltage on the system transmission line; Calculate the transmission line losses between the distributed generation and the load based on the system single-phase resistivity, the distance from the source to the load, the distance from the source to the distributed generation, the active power consumed by the load, the phase voltage on the system transmission line, and the reactive power consumed by the load; The network loss of the substation is the sum of the system loss between the power source and the distributed power source and the transmission line loss between the distributed power source and the load.

8. The method according to claim 7, characterized in that The system loss between the power source and the distributed power source is calculated based on the system single-phase resistivity, the distance from the power source to the distributed power source, the active power consumed by the load, the reactive power consumed by the load, the active power output by the distributed power source, the active power output by the distributed power source and the phase voltage on the system transmission line, including: Calculating system load based on active power consumed by the load and reactive power consumed by the load; Calculating a single-phase current flowing into the load based on the system load and the phase voltage on the system transmission line; Based on the system single-phase resistivity, the distance from the power source to the distributed power source and the single-phase current flowing into the load combined with the first loss calculation formula, the system loss between the power source and the distributed power source is obtained.

9. The method according to claim 8, characterized in that The first loss calculation formula is as follows: Where, L sg : Transmission line loss between power source and distributed generation in model II, r is the single-phase resistivity of the system, I s : Power supply output single-phase current, G: Distance from power supply to distributed power supply, P l : Active power consumed by the load, Q l : Reactive power consumed by the load, P g : Active power output of distributed power supply, Q g : The active power output by the distributed generation, V is the phase voltage on the system transmission line.

10. The method according to claim 7, characterized in that The transmission line loss between the distributed generation and the load is calculated as follows: Where, L gl : Transmission line loss between distributed generation and load in model II; r is the system single-phase resistivity; L: distance from the power source to the load; G: distance from the power source to the distributed generation; I l : Single-phase current flowing into the load; P l : Active power consumed by the load; Q l : Reactive power consumed by the load; V is the phase voltage on the system transmission line.

11. The method according to claim 1, characterized in that After calculating the area network loss corresponding to each access location based on the simulation results of each access location, the following steps are also included: The access location corresponding to the minimum grid loss in the substation is used as the access location of the distributed generation to optimize the power system.

12. A substation network loss analysis system, characterized in that: include: A model building module is used to establish a simulation analysis model of distributed power sources and substations based on the collected data of distributed power sources in the substations; A simulation module, for performing power flow simulation calculations using the simulation analysis model based on each location where the distributed power source can be connected, and obtaining simulation results for each access location; The network loss calculation module is used to calculate the network loss of the substation corresponding to each access location based on the simulation results of each access location.

13. The system of claim 12, wherein: The various data of distributed power sources in the substation area include: user information, line loss information, distributed power source information, substation area network structure and monitoring data; The distributed power source information includes: the capacity, type and operation mode of the distributed power source; The user information includes: user type, power load, and power usage habits; The line loss information includes: historical line loss data and real-time line loss data; The substation network structure: topological relationship and line impedance of the power supply network; The monitoring data includes: electrical parameters, real-time data of distributed power sources and real-time change data of load in the substation area; The electrical parameters include: voltage, current, and power factor within the substation; The real-time data of the distributed power source includes real-time output power, voltage, and current; The real-time change data of the substation load includes: total load and load of each branch.

14. The system of claim 12, wherein: The simulation module is specifically used for: Assuming that the voltage of the entire network is the rated voltage, the power loss in each component and the power at the starting point are obtained by extrapolating from the end to the starting point of the simulation analysis model. Based on the starting power and the set starting voltage, the voltage drop is calculated step by step from the starting end to the end until the set convergence condition is met or the maximum number of iterative calculations is reached, and the voltage, current and power distribution of each node in the substation area is obtained.

15. The system of claim 14, wherein: The voltage of the node is calculated as follows: In the formula, is the node L2 voltage at k iterations, is the node L1 voltage at k iterations, Z L is the impedance between L nodes, is the current between L nodes for k iterations, where L, L2, and L1 are node numbers.

16. An electronic device, characterized in that: include: at least one processor and memory; The memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, a substation network loss analysis method as described in any one of claims 1 to 11 is implemented.

17. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, a substation network loss analysis method as described in any one of claims 1 to 11 is implemented.

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