Power distribution network load flow calculation method, power distribution network load flow calculation device and power distribution network load flow calculation system

Abstract

The invention provides a power distribution network load flow calculation method, a power distribution network load flow calculation device and a power distribution network load flow calculation system. The method comprises the following steps: establishing a power distribution network load flow equation; under the condition that any node in the power distribution network is disconnected, a first equation is established according to the voltage phase angle, the reactance and the initial power flow quantity of each target branch, and the target branch is an affected branch after the node is disconnected; determining the ratio of the load flow increment of the target branch to the initial load flow quantity of the node as a distribution factor; establishing a second equation according to a vector formed by the distribution factors and an active power flow vector of an affected branch when the power distribution network is in a steady state; carrying out calculation by combining the power distribution network power flow equation, the first equation and the second equation to obtain a power flow increment of the influenced branch; and adjusting the power distribution of the affected power equipment in the power distribution network according to the power flow increment of the affected branch. According to the method, the problem that affected power equipment cannot be adjusted in time due to low load flow calculation efficiency in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of power system analysis, and in particular to a distribution network power flow calculation method, a calculation device, a computer-readable storage medium, a computer program product, and a distribution network power flow calculation system. Background Art

[0002] Due to the continuous improvement of the degree of industrialization and the improvement of the living standards of urban residents around the world, the demand for electric energy continues to grow, further aggravating the energy crisis and environmental pollution problems. Achieving a high proportion of renewable energy grid connection can alleviate the energy crisis and environmental pollution problems, but it increases the complexity and uncertainty of the safe and stable operation of the active distribution network. In order to effectively prevent the above problems that occur during the operation of the active distribution network, the safety and stability of the active distribution network needs to be evaluated in real time, quickly and accurately. Flow calculation is the basis for analyzing the operating status of the distribution network. Based on the topological structure and operating conditions of the network, the operating status of the power system is determined, such as the voltage amplitude of each node, the voltage phase angle of each node, the network power distribution and other operating conditions. It plays a very important role in the reliability, safety, economic analysis, fault handling and network reconstruction of the power system.

[0003] At present, the main power flow calculation method generally calculates the power flow transfer through a complex search algorithm, which usually requires traversing the entire network to find a solution that satisfies the power flow equation. In the distribution network, especially when the network structure is complex and the number of distributed power sources is large, the search algorithm needs to continuously update the network status and adjust the boundary conditions of the load and power supply to solve the power flow distribution of the network. Although it can theoretically provide an accurate power flow solution, its calculation process involves a large number of search steps, especially when dealing with large-scale power grids or active distribution networks with a high proportion of renewable energy access, the calculation time is significantly increased. Since the search algorithm requires a large number of search steps, the calculation process is time-consuming, which affects the efficiency of the power flow transfer calculation. Therefore, it is impossible to timely evaluate the various electrical changes in the branches of the power system under disturbance or fault conditions, and it is impossible to timely identify the lines or equipment that may bear additional loads due to excessive current, and it is impossible to timely adjust the equipment or lines for prevention. Summary of the invention

[0004] The main purpose of the present application is to provide a distribution network flow calculation method, a calculation device, a computer-readable storage medium, a computer program product and a distribution network flow calculation system, so as to at least solve the problem in the prior art that the affected power equipment cannot be adjusted in time due to the low efficiency of flow calculation.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a distribution network power flow calculation method is provided, including: establishing a distribution network power flow equation, the distribution network power flow equation includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the distribution network; when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, and the first equation is used Calculate the power flow increment of the affected branch, the initial power flow is the power flow of the node or the target branch before the node is disconnected; determine the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch; form a distribution factor vector with the distribution factors of each target branch of the affected branch; establish a second equation based on the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, and the second equation is used to calculate the power flow increment of the affected branch; calculate the power flow increment of the affected branch by combining the distribution network power flow equation, the first equation and the second equation; adjust the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0006] Optionally, a power flow equation of a distribution network is established, wherein the power flow equation of the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, including: establishing a common coupling node power flow equation Wherein, N is the total number of nodes in the distribution network, Y ik is the admittance of the branch between node i and node k, is the voltage vector of node k, is the voltage vector of node i, is the complex power of node i, is the complex power generated by the generator at node i, is the complex power consumed by the load at node i, is the voltage vector at node r, V r sp Assign a known voltage value to node r, G is the set of common coupling nodes in the distribution network; establish the load node flow equation Among them, Y lk is the admittance of the branch between node l and node k, is the voltage vector at node l, is the known injected active power at load node l, is the known injected reactive power of load node l, P Ll is the active power consumed by load node l, Q Ll is the reactive power consumed by load node k, is the complex power generated by the generator at node l, is the complex power consumed by the load at node l, L is the set of load nodes in the distribution network; establish the distributed power flow equation Among them, Y mk is the admittance of the branch between nodes m and k, is the voltage vector of node m, is the complex power generated by the generator at node m, is the complex power consumed by the load of node m, is the known active power injected by node m, is the reactive power injected by node m.

[0007] Optionally, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, including: establishing a first equation according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch Wherein, m is the total number of the affected branches, is the power flow of branch k after node l is disconnected, P k is the initial power flow of branch k, θ′ k is the voltage phase angle of branch k, x k is the reactance of branch k, and ΔP is the power flow increment of the affected branch.

[0008] Optionally, determining the ratio of the flow increment of the target branch to the initial flow amount of the node as the distribution factor of the target branch includes: determining the distribution factor Where ΔP k is the power flow increment of branch k after node l is disconnected, P l is the initial power flow at node l.

[0009] Optionally, a second equation is established according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, including: when the node is disconnected, calculating the susceptance matrix of the distribution network, the susceptance matrix is Among them, B 0 is the susceptance matrix of the distribution network before the node is disconnected, A Δ is the correlation matrix composed of the correlation vectors of the affected branches, is the branch susceptance change matrix of the branch where the node is located before the node is disconnected; the active power flow column vector P of the affected branch when the distribution network is in a steady state is calculated according to the susceptance matrix of the distribution network ml =B'θ, where θ is the voltage phase angle vector of the node; establish the second equation ΔP k =D k P ml , where D k is the distribution factor vector, P ml is the active power flow vector of the affected branch when the distribution network is in a steady state.

[0010] Optionally, adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch includes: adjusting the power distribution of the affected power equipment in the distribution network when the power flow increment of the affected branch exceeds a predetermined threshold.

[0011] According to another aspect of the present application, a distribution network power flow calculation device is provided, comprising: a first establishing unit, used to establish a distribution network power flow equation, the distribution network power flow equation comprises a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the distribution network; a second establishing unit, used to establish a first equation according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow amount of each target branch when any node in the distribution network is disconnected, the target branch is the affected branch after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow amount of the target branch is used to calculate the power flow increment of the affected branch. The initial power flow is the power flow of the node or the target branch before the node is disconnected; the first determining unit is used to determine the ratio of the power flow increment of the target branch and the initial power flow of the node as the distribution factor of the target branch; the third establishing unit is used to form a distribution factor vector with each distribution factor of each target branch of the affected branch; the fourth establishing unit is used to establish a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, and the second equation is used to calculate the power flow increment of the affected branch; the first calculating unit is used to jointly calculate the power flow increment of the affected branch by the distribution network power flow equation, the first equation and the second equation; the first control unit is used to adjust the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0012] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the method described in any one of the devices where the computer-readable storage medium is located is controlled.

[0013] According to another aspect of the present application, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, any one of the methods described above is implemented.

[0014] According to another aspect of the present application, a distribution network flow calculation system is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0015] Applying the technical solution of the present application, in the above-mentioned distribution network power flow calculation method, it includes: establishing a distribution network power flow equation, the above-mentioned distribution network power flow equation includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, the above-mentioned common coupling node power flow equation is used to calculate the complex power of the common coupling node in the above-mentioned distribution network, the above-mentioned load node power flow equation is used to calculate the complex power of the load node in the above-mentioned distribution network, and the above-mentioned distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the above-mentioned distribution network; when any node in the above-mentioned distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each of the above-mentioned target branches and the initial power flow of each of the above-mentioned target branches, the above-mentioned target branch is the branch affected after the above-mentioned node is disconnected, and the above-mentioned first equation is used to calculate the above The flow increment of the affected branch, the above-mentioned initial flow amount is the flow amount of the above-mentioned node or the above-mentioned target branch before the above-mentioned node is disconnected; the ratio of the above-mentioned flow increment of the above-mentioned target branch to the initial flow amount of the above-mentioned node is determined as the distribution factor of the above-mentioned target branch; the above-mentioned distribution factors of each of the above-mentioned target branches of the above-mentioned affected branch are combined into a distribution factor vector; according to the above-mentioned distribution factor vector and the active flow vector of the above-mentioned affected branch when the above-mentioned distribution network is in a steady state, a second equation is established, and the above-mentioned second equation is used to calculate the above-mentioned flow increment of the above-mentioned affected branch; the above-mentioned flow increment of the above-mentioned affected branch is calculated by combining the above-mentioned distribution network flow equation, the above-mentioned first equation and the above-mentioned second equation; according to the above-mentioned flow increment of the above-mentioned affected branch, the power distribution of the affected power equipment in the above-mentioned distribution network is adjusted. The present application calculates the complex power of common coupling nodes, load nodes and distributed power sources in the distribution network by establishing a distribution network flow equation, calculates the flow increment of the affected branch after the node is disconnected in the distribution network by combining the distribution network flow equation, the first equation and the second equation, and timely adjusts the power distribution of the affected power equipment according to the flow increment to avoid line overload affecting the normal operation of the distribution network, thereby solving the problem in the prior art that the affected power equipment cannot be adjusted in time due to low flow calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A hardware structure block diagram of a mobile terminal according to a method for calculating power flow in a distribution network provided in an embodiment of the present application is shown;

[0017] Figure 2 A schematic diagram of a flow chart of a distribution network power flow calculation method provided according to an embodiment of the present application is shown;

[0018] Figure 3 A structural block diagram of a power distribution network flow calculation device provided according to an embodiment of the present application is shown.

[0019] The above drawings include the following reference numerals:

[0020] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] As introduced in the background technology, the calculation process of the power flow calculation in the prior art is time-consuming, which affects the efficiency of the power flow transfer calculation and results in the inability to timely identify lines or equipment that may be subject to additional loads due to excessive current. In order to solve this technical problem, the embodiments of the present application provide a distribution network power flow calculation method, a calculation device, a computer-readable storage medium, a computer program product and a distribution network power flow calculation system.

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for calculating power flow in a distribution network according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0027] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as a computer program corresponding to a power distribution network flow calculation method in an embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned specific network example may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0028] In this embodiment, a distribution network flow calculation method running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0029] Figure 2 1 is a flow chart of a method for calculating power flow in a distribution network according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0030] Step S201, establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0031] Specifically, the distribution network power flow equation is established to calculate the power balance relationship among the common coupling nodes, load nodes and distributed power sources in the distribution network. By calculating the complex power of the common coupling nodes, load nodes and distributed power sources, the power flow of each part of the power system can be determined, thereby realizing the monitoring of the operation of the distribution network and providing a basis for the subsequent analysis of power flow distribution.

[0032] Step S202, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0033] Specifically, when a node in the distribution network is disconnected, it will affect the branches connected to the node. The affected branches are regarded as target branches. According to the voltage phase angle, reactance and initial power flow of each target branch, an equation can be established to calculate the power flow increment of the target branch. This can help analyze the power flow changes of the affected branches after the node is disconnected, thereby evaluating the stability of the distribution network.

[0034] Step S203, determining the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0035] Specifically, by calculating the ratio of the flow increment of the target branch to the initial flow of the node, the distribution factor of the target branch can be determined. The distribution factor reflects the degree of influence of node disconnection on different branches. When the distribution factor is large, it indicates that the branch is greatly affected by the node disconnection. By calculating the distribution factors of different branches, the stability of the system can be evaluated more comprehensively.

[0036] Step S204, forming a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0037] Specifically, by combining the distribution factors of each target branch of the affected branch into a distribution factor vector, the degree to which each branch in the entire system is affected when the node is disconnected can be more comprehensively described. The distribution factor vector is used to assist in the subsequent calculation of the flow increment of the affected branch.

[0038] Step S205, establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0039] Specifically, the distribution factor vector and the active power flow vector of the affected branch in steady state are used to establish the second equation for calculating the power flow increment of the affected branch. This equation can help analyze the size of the power flow increment of the affected branch when the node is disconnected. By calculating the power flow increment, it provides information for solving the subsequent simultaneous equations for the power flow increment.

[0040] Step S206, jointly calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0041] Specifically, by combining the distribution network power flow equation, the first equation and the second equation, the power flow increment of the affected branch can be calculated. This calculation process will comprehensively consider the impact of node disconnection on the affected branch of the distribution network.

[0042] Step S207: adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0043] Specifically, based on the calculation results of the power flow increment of the affected branches, the power equipment or branches that are more severely affected can be identified, and their power distribution can be adjusted to reduce the power flow load, reduce the risk of overload, optimize the system operation, and help system operators to adjust the system operation status in a timely manner to ensure that each device operates within a safe and reliable range.

[0044] Through this embodiment, in the above-mentioned distribution network power flow calculation method, a distribution network power flow equation is established, and the above-mentioned distribution network power flow equation includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation. The above-mentioned common coupling node power flow equation is used to calculate the complex power of the common coupling node in the above-mentioned distribution network, the above-mentioned load node power flow equation is used to calculate the complex power of the load node in the above-mentioned distribution network, and the above-mentioned distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the above-mentioned distribution network; when any node in the above-mentioned distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each of the above-mentioned target branches and the initial power flow of each of the above-mentioned target branches. The above-mentioned target branch is the affected branch after the above-mentioned node is disconnected, and the above-mentioned first equation is used to calculate the above-mentioned affected branch. The power flow increment of the branch, the initial power flow is the power flow of the node or the target branch before the node is disconnected; the ratio of the power flow increment of the target branch to the initial power flow of the node is determined as the distribution factor of the target branch; the distribution factors of the target branches of the affected branches are combined into a distribution factor vector; according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, a second equation is established, and the second equation is used to calculate the power flow increment of the affected branch; the power flow increment of the affected branch is calculated by combining the distribution network power flow equation, the first equation and the second equation; according to the power flow increment of the affected branch, the power distribution of the affected power equipment in the distribution network is adjusted. The present application calculates the complex power of common coupling nodes, load nodes and distributed power sources in the distribution network by establishing a distribution network flow equation, calculates the flow increment of the affected branch after the node is disconnected in the distribution network by combining the distribution network flow equation, the first equation and the second equation, and timely adjusts the power distribution of the affected power equipment according to the flow increment to avoid line overload affecting the normal operation of the distribution network, thereby solving the problem in the prior art that the affected power equipment cannot be adjusted in time due to low flow calculation efficiency.

[0045] In order to further determine the power flow equation of the distribution network, in an optional implementation, a power flow equation of the distribution network is established, the power flow equation of the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, and the step S201 includes:

[0046] Step S2011, establish the common coupling node power flow equation Where N is the total number of nodes in the above distribution network, Y ik is the admittance of the branch between node i and node k, is the voltage vector of node k, is the voltage vector of node i, is the complex power of node i, is the complex power generated by the generator at node i, is the complex power consumed by the load at node i, is the voltage vector at node r, V r sp Assign a known voltage value to the node r, G is the set of common coupling nodes in the above distribution network;

[0047] Specifically, the common coupling node power flow equation is established to describe the power relationship between the nodes in the distribution network. Each node is connected through the admittance of the branch. In the common coupling node power flow equation, the power generated by the node's generator, the power consumed by the load and the known voltage assignment are taken into account, describing the power flow characteristics between the nodes in the distribution network.

[0048] Step S2012: Establish load node flow equation Among them, Y lk is the admittance of the branch between node l and node k, is the voltage vector at node l, is the known injected active power at load node l, is the known injected reactive power of load node l, P Ll is the active power consumed by load node l, Q Ll is the reactive power consumed by load node k, is the complex power generated by the generator at node l, is the complex power consumed by the load at node l, L is the set of load nodes in the above distribution network;

[0049] Specifically, the load node flow equation is established to describe the power relationship between load nodes in the distribution network. By considering the admittance of the branch, the voltage vector of the node, and the active power and reactive power injected into each node, the active power and reactive power consumed by the node can be calculated. The load node flow equation describes the power flow characteristics between load nodes.

[0050] Step S2013: Establishing the distributed power flow equation Among them, Y mk is the admittance of the branch between nodes m and k, is the voltage vector of node m, is the complex power generated by the generator at node m, is the complex power consumed by the load of node m, is the known active power injected by node m, is the reactive power injected by node m.

[0051] Specifically, the distributed power flow equation is established to describe the power relationship between distributed power nodes in the distribution network. The power flow characteristics of distributed power nodes can be calculated by considering the admittance of the branch, the voltage vector of the node, the power generated by the node generator, the power consumed by the load, and the known injected active power and reactive power.

[0052] In order to obtain the first equation, in an optional implementation manner, when any node in the above-mentioned distribution network is disconnected, the first equation is established according to the voltage phase angle of each target branch, the reactance of each of the above-mentioned target branches and the initial power flow of each of the above-mentioned target branches, and the above-mentioned step S202 includes:

[0053] Step S2021, establishing a first equation based on the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch Where m is the total number of the above affected branches, is the power flow of branch k after node l is disconnected, P k is the initial power flow of branch k, θ′ k is the voltage phase angle of branch k, x k is the reactance of branch k, and ΔP is the above power flow increment of the above affected branch.

[0054] Specifically, based on the voltage phase angle, reactance and initial power flow of the affected branches, the first equation is established. In this equation, the number of affected branches, the change in power flow of each branch after disconnecting the node, the initial power flow of each branch, the voltage phase angle and reactance are taken into account. The power flow increment of all affected branches is calculated. The calculation of the power flow increment helps to evaluate the impact of node disconnection on the entire system.

[0055] In order to obtain the distribution factor, in an optional implementation, the ratio of the flow increment of the target branch to the initial flow amount of the node is determined as the distribution factor of the target branch, and the step S203 includes:

[0056] Step S2031, determine the above distribution factor Where ΔP k is the power flow increment of branch k after node l is disconnected, P l is the initial power flow at node l.

[0057] Specifically, in the process of determining the distribution factor, it is necessary to calculate the ratio of the flow increment of each branch to the initial flow of the node. This ratio is an important parameter used to measure the impact of node disconnection on the flow changes of each branch.

[0058] In order to obtain the second equation, in an optional implementation manner, the second equation is established according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, and the step S205 includes:

[0059] Step S2051, when the above node is disconnected, calculate the susceptance matrix of the above distribution network, the above susceptance matrix is Among them, B 0 is the susceptance matrix of the above distribution network before the above node is disconnected, A Δ is the correlation matrix composed of the correlation vectors of the above affected branches, is the branch susceptance change matrix of the branch where the above node is located before the above node is disconnected;

[0060] Specifically, when a node is disconnected, the susceptance matrix of the distribution network needs to be recalculated. This new susceptance matrix can be calculated through the original susceptance matrix, the association matrix composed of the association vectors of the affected branches, and the branch susceptance change matrix of the branch where the node is located before the node is disconnected. This susceptance matrix describes the electrical connection relationship between the nodes in the system.

[0061] Step S2052: Calculate the active power flow column vector P of the affected branch when the distribution network is in a steady state according to the susceptance matrix of the distribution network. ml =B'θ, where θ is the voltage phase angle vector of the above node;

[0062] Specifically, the active power flow vector of the affected branch in steady state can be calculated using the susceptance matrix of the distribution network. This active power flow vector can be calculated through the voltage phase angle vector and the susceptance matrix of the node to describe the current transmission situation in the affected branch.

[0063] Step S2053, establish the second equation ΔP k =D k P ml , where D k is the above distribution factor vector, P ml is the active power flow vector of the affected branch when the distribution network is in a steady state.

[0064] Specifically, a second equation is established to calculate the power flow increment of the affected branch, where the distribution factor vector is a parameter that takes into account the degree of influence of node disconnection on the power flow of each branch, and the active power flow vector of the affected branch describes the current transmission of the affected branch. Through this equation, the distribution factor and the active power flow vector can be comprehensively considered to calculate the power flow increment of the affected branch, which helps to analyze the changes in the electrical parameters of the system when the node is disconnected, and provide decision-making basis for system operators, which helps system operators to promptly discover problems, make adjustments, and prevent potential failures and accidents.

[0065] In order to adjust the distribution network equipment according to the power flow increment, in an optional implementation manner, according to the power flow increment of the affected branch, the power distribution of the affected power equipment in the distribution network is adjusted, and the step S207 includes:

[0066] Step S2071: When the power flow increment of the affected branch exceeds a predetermined threshold, adjust the power distribution of the affected power equipment in the distribution network.

[0067] Specifically, when the power flow increment of the affected branch exceeds a predetermined threshold, it is necessary to adjust the power distribution of the affected power equipment. By adjusting the power distribution of the affected power equipment, the load of the affected branch can be reduced, the current can be reduced, overload problems can be avoided, the operating state of the power system can be optimized, the reliability of the system can be improved, the risk of system failure can be reduced, and the stable power supply of the power system can be ensured.

[0068] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0069] The embodiment of the present application also provides a distribution network flow calculation device. It should be noted that a distribution network flow calculation device of the embodiment of the present application can be used to execute a distribution network flow calculation method provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0070] The following introduces a distribution network power flow calculation device provided in an embodiment of the present application.

[0071] Figure 3 is a structural block diagram of a distribution network power flow calculation device according to an embodiment of the present application. Figure 3 As shown, the device comprises:

[0072] The first establishing unit 10 is used to establish a power flow equation of a distribution network, wherein the power flow equation of the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0073] Specifically, the distribution network power flow equation is established to calculate the power balance relationship among the common coupling nodes, load nodes and distributed power sources in the distribution network. By calculating the complex power of the common coupling nodes, load nodes and distributed power sources, the power flow of each part of the power system can be determined, thereby realizing the monitoring of the operation of the distribution network and providing a basis for the subsequent analysis of power flow distribution.

[0074] A second establishing unit 20 is used to establish a first equation according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch when any node in the distribution network is disconnected, wherein the target branch is the branch affected after the node is disconnected, and the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0075] Specifically, when a node in the distribution network is disconnected, it will affect the branches connected to the node. The affected branches are regarded as target branches. According to the voltage phase angle, reactance and initial power flow of each target branch, an equation can be established to calculate the power flow increment of the target branch. This can help analyze the power flow changes of the affected branches after the node is disconnected, thereby evaluating the stability of the distribution network.

[0076] A first determining unit 30 is used to determine the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0077] Specifically, by calculating the ratio of the flow increment of the target branch to the initial flow of the node, the distribution factor of the target branch can be determined. The distribution factor reflects the degree of influence of node disconnection on different branches. When the distribution factor is large, it indicates that the branch is greatly affected by the node disconnection. By calculating the distribution factors of different branches, the stability of the system can be evaluated more comprehensively.

[0078] A third establishing unit 40 is used to form a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0079] Specifically, by combining the distribution factors of each target branch of the affected branch into a distribution factor vector, the degree to which each branch in the entire system is affected when the node is disconnected can be more comprehensively described. The distribution factor vector is used to assist in the subsequent calculation of the flow increment of the affected branch.

[0080] A fourth establishing unit 50, configured to establish a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0081] Specifically, the distribution factor vector and the active power flow vector of the affected branch in steady state are used to establish the second equation for calculating the power flow increment of the affected branch. This equation can help analyze the size of the power flow increment of the affected branch when the node is disconnected. By calculating the power flow increment, it provides information for solving the subsequent simultaneous equations for the power flow increment.

[0082] A first calculation unit 60, used for calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0083] Specifically, by combining the distribution network power flow equation, the first equation and the second equation, the power flow increment of the affected branch can be calculated. This calculation process will comprehensively consider the impact of node disconnection on the affected branch of the distribution network.

[0084] The first control unit 70 is used to adjust the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0085] Specifically, based on the calculation results of the power flow increment of the affected branches, the power equipment or branches that are more severely affected can be identified, and their power distribution can be adjusted to reduce the power flow load, reduce the risk of overload, optimize the system operation, and help system operators to adjust the system operation status in a timely manner to ensure that each device operates within a safe and reliable range.

[0086] Through this embodiment, the first establishing unit is used to establish the distribution network power flow equation, the distribution network power flow equation includes the common coupling node power flow equation, the load node power flow equation and the distributed power supply power flow equation, the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the distribution network; the second establishing unit is used to establish the first equation according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch when any node in the distribution network is disconnected, the target branch is the affected branch after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow increment of the node disconnected. before, the power flow of the above-mentioned node or the above-mentioned target branch; a first determining unit, used to determine the ratio of the above-mentioned power flow increment of the above-mentioned target branch and the initial power flow of the above-mentioned node as the distribution factor of the above-mentioned target branch; a third establishing unit, used to form a distribution factor vector with the above-mentioned distribution factors of each of the above-mentioned target branches of the above-mentioned affected branches; a fourth establishing unit, used to establish a second equation according to the above-mentioned distribution factor vector and the active power flow vector of the above-mentioned affected branch when the above-mentioned distribution network is in a steady state, and the above-mentioned second equation is used to calculate the above-mentioned power flow increment of the above-mentioned affected branch; a first calculating unit, used to jointly calculate the above-mentioned power flow increment of the above-mentioned affected branch by combining the above-mentioned distribution network power flow equation, the above-mentioned first equation and the above-mentioned second equation; a first control unit, used to adjust the power distribution of the affected power equipment in the above-mentioned distribution network according to the above-mentioned power flow increment of the above-mentioned affected branch. The present application calculates the complex power of common coupling nodes, load nodes and distributed power sources in the distribution network by establishing a distribution network flow equation, calculates the flow increment of the affected branch after the node is disconnected in the distribution network by combining the distribution network flow equation, the first equation and the second equation, and timely adjusts the power distribution of the affected power equipment according to the flow increment to avoid line overload affecting the normal operation of the distribution network, thereby solving the problem in the prior art that the affected power equipment cannot be adjusted in time due to low flow calculation efficiency.

[0087] In order to further determine the power flow equation of the distribution network, in an optional implementation, a power flow equation of the distribution network is established, the power flow equation of the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, and the first establishing unit includes:

[0088] The first module is used to establish the common coupling node power flow equation Where N is the total number of nodes in the above distribution network, Y ik is the admittance of the branch between node i and node k, is the voltage vector of node k, is the voltage vector of node i, is the complex power of node i, is the complex power generated by the generator at node i, is the complex power consumed by the load at node i, is the voltage vector at node r, V r sp Assign a known voltage value to the node r, G is the set of common coupling nodes in the above distribution network;

[0089] Specifically, the common coupling node power flow equation is established to describe the power relationship between the nodes in the distribution network. Each node is connected through the admittance of the branch. In the common coupling node power flow equation, the power generated by the node's generator, the power consumed by the load and the known voltage assignment are taken into account, describing the power flow characteristics between the nodes in the distribution network.

[0090] The second module is used to establish the load node flow equation Among them, Y lk is the admittance of the branch between node l and node k, is the voltage vector at node l, is the known injected active power at load node l, is the known injected reactive power of load node l, P Ll is the active power consumed by load node l, Q Ll is the reactive power consumed by load node k, is the complex power generated by the generator at node l, is the complex power consumed by the load at node l, L is the set of load nodes in the above distribution network;

[0091] Specifically, the load node flow equation is established to describe the power relationship between load nodes in the distribution network. By considering the admittance of the branch, the voltage vector of the node, and the active power and reactive power injected into each node, the active power and reactive power consumed by the node can be calculated. The load node flow equation describes the power flow characteristics between load nodes.

[0092] The third module is used to establish the distributed power flow equation Among them, Y mk is the admittance of the branch between nodes m and k, is the voltage vector of node m, is the complex power generated by the generator at node m, is the complex power consumed by the load of node m, is the known active power injected by node m, is the reactive power injected by node m.

[0093] Specifically, the distributed power flow equation is established to describe the power relationship between distributed power nodes in the distribution network. The power flow characteristics of distributed power nodes can be calculated by considering the admittance of the branch, the voltage vector of the node, the power generated by the node generator, the power consumed by the load, and the known injected active power and reactive power.

[0094] In order to obtain the first equation, in an optional implementation manner, when any node in the above-mentioned distribution network is disconnected, the first equation is established according to the voltage phase angle of each target branch, the reactance of each of the above-mentioned target branches and the initial power flow of each of the above-mentioned target branches, and the above-mentioned second establishing unit includes:

[0095] The fourth establishment module is used to establish the first equation according to the voltage phase angle of each of the above target branches, the reactance of each of the above target branches and the initial power flow of each of the above target branches. Where m is the total number of the above affected branches, is the power flow of branch k after node l is disconnected, P k is the initial power flow of branch k, θ′ k is the voltage phase angle of branch k, x k is the reactance of branch k, and ΔP is the above power flow increment of the above affected branch.

[0096] Specifically, based on the voltage phase angle, reactance and initial power flow of the affected branches, the first equation is established. In this equation, the number of affected branches, the change in power flow of each branch after disconnecting the node, the initial power flow of each branch, the voltage phase angle and reactance are taken into account. The power flow increment of all affected branches is calculated. The calculation of the power flow increment helps to evaluate the impact of node disconnection on the entire system.

[0097] In order to obtain the distribution factor, in an optional implementation manner, the ratio of the flow increment of the target branch to the initial flow amount of the node is determined as the distribution factor of the target branch, and the first determination unit includes:

[0098] The first determination module is used to determine the above distribution factor Where ΔP k is the power flow increment of branch k after node l is disconnected, P l is the initial power flow at node l.

[0099] Specifically, in the process of determining the distribution factor, it is necessary to calculate the ratio of the flow increment of each branch to the initial flow of the node. This ratio is an important parameter used to measure the impact of node disconnection on the flow changes of each branch.

[0100] In order to obtain the second equation, in an optional implementation manner, the second equation is established according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, and the fourth establishing unit includes:

[0101] The fifth establishment module is used to calculate the susceptance matrix of the distribution network when the node is disconnected. The susceptance matrix is Among them, B 0 is the susceptance matrix of the above distribution network before the above node is disconnected, A Δ is the correlation matrix composed of the correlation vectors of the above affected branches, is the branch susceptance change matrix of the branch where the above node is located before the above node is disconnected;

[0102] Specifically, when a node is disconnected, the susceptance matrix of the distribution network needs to be recalculated. This new susceptance matrix can be calculated through the original susceptance matrix, the association matrix composed of the association vectors of the affected branches, and the branch susceptance change matrix of the branch where the node is located before the node is disconnected. This susceptance matrix describes the electrical connection relationship between the nodes in the system.

[0103] The sixth establishment module is used to calculate the active power flow column vector P of the above-mentioned affected branch when the above-mentioned distribution network is in a steady state according to the above-mentioned susceptance matrix of the above-mentioned distribution network. ml =B'θ, where θ is the voltage phase angle vector of the above node;

[0104] Specifically, the active power flow vector of the affected branch in steady state can be calculated using the susceptance matrix of the distribution network. This active power flow vector can be calculated through the voltage phase angle vector and the susceptance matrix of the node to describe the current transmission situation in the affected branch.

[0105] The seventh building module is to build the second equation ΔP k =D k P ml , where D k is the above distribution factor vector, P ml is the active power flow vector of the affected branch when the distribution network is in a steady state.

[0106] Specifically, a second equation is established to calculate the power flow increment of the affected branch, where the distribution factor vector is a parameter that takes into account the degree of influence of node disconnection on the power flow of each branch, and the active power flow vector of the affected branch describes the current transmission of the affected branch. Through this equation, the distribution factor and the active power flow vector can be comprehensively considered to calculate the power flow increment of the affected branch, which helps to analyze the changes in the electrical parameters of the system when the node is disconnected, and provide decision-making basis for system operators, which helps system operators to promptly discover problems, make adjustments, and prevent potential failures and accidents.

[0107] In order to adjust the distribution network equipment according to the power flow increment, in an optional implementation manner, according to the power flow increment of the affected branch, the power distribution of the affected power equipment in the distribution network is adjusted, and the first control unit includes:

[0108] The first control module is used to adjust the power distribution of the affected power equipment in the distribution network when the power flow increment of the affected branch exceeds a predetermined threshold.

[0109] Specifically, when the power flow increment of the affected branch exceeds a predetermined threshold, it is necessary to adjust the power distribution of the affected power equipment. By adjusting the power distribution of the affected power equipment, the load of the affected branch can be reduced, the current can be reduced, overload problems can be avoided, the operating state of the power system can be optimized, the reliability of the system can be improved, the risk of system failure can be reduced, and the stable power supply of the power system can be ensured.

[0110] The above-mentioned distribution network flow calculation device includes a processor and a memory, and the above-mentioned first establishment unit, second establishment unit, first determination unit, third establishment unit, fourth establishment unit, first calculation unit, first control unit, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions. The above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in different processors in the form of any combination.

[0111] The processor contains a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the efficiency of power flow calculation can be improved by adjusting the kernel parameters.

[0112] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0113] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the distribution network power flow calculation method.

[0114] Specifically, a distribution network power flow calculation method includes:

[0115] Step S201, establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0116] Step S202, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0117] Step S203, determining the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0118] Step S204, forming a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0119] Step S205, establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0120] Step S206, jointly calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0121] Step S207: adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0122] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the program executes the above-mentioned distribution network power flow calculation method when running.

[0123] Specifically, a distribution network power flow calculation method includes:

[0124] Step S201, establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0125] Step S202, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0126] Step S203, determining the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0127] Step S204, forming a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0128] Step S205, establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0129] Step S206, jointly calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0130] Step S207: adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0131] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0132] Step S201, establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0133] Step S202, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0134] Step S203, determining the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0135] Step S204, forming a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0136] Step S205, establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0137] Step S206, jointly calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0138] Step S207: adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0139] An embodiment of the present application also provides a distribution network flow calculation system, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, including executing any one of the above-mentioned methods for evaluating the power supply capacity of a feeder group.

[0140] Specifically, a distribution network power flow calculation method includes:

[0141] Step S201, establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power flow equation is used to calculate the complex power of the distributed power sources in the distribution network;

[0142] Step S202, when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected;

[0143] Step S203, determining the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch;

[0144] Step S204, forming a distribution factor vector by combining the distribution factors of the target branches of the affected branches;

[0145] Step S205, establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch;

[0146] Step S206, jointly calculating the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation;

[0147] Step S207: adjusting the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

[0148] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0149] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0150] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0151] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0152] 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 A step that specifies a function in one or more boxes.

[0153] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0154] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0155] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0156] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0157] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0158] 1) A distribution network flow calculation method of the present application, establishing a distribution network flow equation, the distribution network flow equation includes a common coupling node flow equation, a load node flow equation and a distributed power supply flow equation, the common coupling node flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply flow equation is used to calculate the complex power of the distributed power supply in the distribution network; when any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial flow amount of each target branch, the target branch is the branch affected after the node is disconnected, and the first equation is used to calculate the affected branch The initial power flow is the power flow of the node or the target branch before the node is disconnected; the ratio of the power flow increment of the target branch to the initial power flow of the node is determined as the distribution factor of the target branch; the distribution factors of the target branches of the affected branches are combined into a distribution factor vector; a second equation is established according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, and the second equation is used to calculate the power flow increment of the affected branch; the power flow increment of the affected branch is calculated by combining the distribution network power flow equation, the first equation and the second equation; according to the power flow increment of the affected branch, the power distribution of the affected power equipment in the distribution network is adjusted. The present application calculates the complex power of common coupling nodes, load nodes and distributed power sources in the distribution network by establishing a distribution network flow equation, calculates the flow increment of the affected branch after the node is disconnected in the distribution network by combining the distribution network flow equation, the first equation and the second equation, and timely adjusts the power distribution of the affected power equipment according to the flow increment to avoid line overload affecting the normal operation of the distribution network, thereby solving the problem in the prior art that the affected power equipment cannot be adjusted in time due to low flow calculation efficiency.

[0159] 2) A distribution network flow calculation device of the present application, a first establishing unit, used to establish a distribution network flow equation, the above-mentioned distribution network flow equation includes a common coupling node flow equation, a load node flow equation and a distributed power supply flow equation, the above-mentioned common coupling node flow equation is used to calculate the complex power of the common coupling node in the above-mentioned distribution network, the above-mentioned load node flow equation is used to calculate the complex power of the load node in the above-mentioned distribution network, and the above-mentioned distributed power supply flow equation is used to calculate the complex power of the distributed power supply in the above-mentioned distribution network; the second establishing unit is used to establish a first equation according to the voltage phase angle of each target branch, the reactance of each of the above-mentioned target branches and the initial flow amount of each of the above-mentioned target branches when any node in the above-mentioned distribution network is disconnected, the above-mentioned target branch is the affected branch after the above-mentioned node is disconnected, the above-mentioned first equation is used to calculate the flow increment of the above-mentioned affected branch, and the above-mentioned initial flow amount is The power flow of the above-mentioned node or the above-mentioned target branch before the above-mentioned node is disconnected; a first determining unit, used to determine the ratio of the above-mentioned power flow increment of the above-mentioned target branch and the initial power flow of the above-mentioned node as the distribution factor of the above-mentioned target branch; a third establishing unit, used to form a distribution factor vector with the above-mentioned distribution factors of each of the above-mentioned target branches of the above-mentioned affected branches; a fourth establishing unit, used to establish a second equation according to the above-mentioned distribution factor vector and the active power flow vector of the above-mentioned affected branch when the above-mentioned distribution network is in a steady state, and the above-mentioned second equation is used to calculate the above-mentioned power flow increment of the above-mentioned affected branch; a first calculating unit, used to jointly calculate the above-mentioned power flow increment of the above-mentioned affected branch by combining the above-mentioned distribution network power flow equation, the above-mentioned first equation and the above-mentioned second equation; a first control unit, used to adjust the power distribution of the affected power equipment in the above-mentioned distribution network according to the above-mentioned power flow increment of the above-mentioned affected branch. The present application calculates the complex power of common coupling nodes, load nodes and distributed power sources in the distribution network by establishing a distribution network flow equation, calculates the flow increment of the affected branch after the node is disconnected in the distribution network by combining the distribution network flow equation, the first equation and the second equation, and timely adjusts the power distribution of the affected power equipment according to the flow increment to avoid line overload affecting the normal operation of the distribution network, thereby solving the problem in the prior art that the affected power equipment cannot be adjusted in time due to low flow calculation efficiency.

[0160] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for calculating power flow in a distribution network, characterized in that: include: Establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the distribution network; In the case where any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, the target branch is the affected branch after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected; Determine the ratio of the power flow increment of the target branch to the initial power flow of the node as the distribution factor of the target branch; Combining the distribution factors of the target branches of the affected branches into a distribution factor vector; Establishing a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch; The power flow increment of the affected branch is calculated by combining the power flow equation of the distribution network, the first equation and the second equation; According to the power flow increment of the affected branch, the power distribution of the affected power equipment in the power distribution network is adjusted.

2. The method according to claim 1, characterized in that: Establishing a power flow equation for a distribution network, wherein the power flow equation for the distribution network includes a common coupling node power flow equation, a load node power flow equation, and a distributed power supply power flow equation, including: Establishing the common coupling node power flow equation Wherein, N is the total number of nodes in the distribution network, Y ik is the admittance of the branch between node i and node k, is the voltage vector of node k, is the voltage vector of node i, is the complex power of node i, is the complex power generated by the generator at node i, is the complex power consumed by the load at node i, is the voltage vector at node r, Assign a known voltage value to the node r, G is a set of common coupling nodes in the distribution network; Establish load node flow equation Among them, Y lk is the admittance of the branch between node l and node k, is the voltage vector at node l, is the known injected active power at load node l, is the known injected reactive power of load node l, P Ll is the active power consumed by load node l, Q Ll is the reactive power consumed by load node k, is the complex power generated by the generator at node l, is the complex power consumed by the load at node l, L is the set of load nodes in the distribution network; Establishing distributed power flow equation Among them, Y mk is the admittance of the branch between node m and node k, is the voltage vector of node m, is the complex power generated by the generator at node m, is the complex power consumed by the load of node m, is the known active power injected by node m, is the reactive power injected by node m.

3. The method according to claim 1, characterized in that When any node in the distribution network is disconnected, a first equation is established according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch, including: The first equation is established based on the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch. Wherein, m is the total number of the affected branches, is the power flow of branch k after node l is disconnected, P k is the initial power flow of branch k, θ k ' is the voltage phase angle of branch k, x k is the reactance of branch k, and ΔP is the power flow increment of the affected branch.

4. The method according to claim 1, characterized in that Determining the ratio of the power flow increment of the target branch to the initial power flow amount of the node as the distribution factor of the target branch includes: Determine the distribution factor Among them, ΔP k is the flow increment of branch k after node l is disconnected, P l is the initial power flow at node l.

5. The method according to claim 1, characterized in that A second equation is established according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, including: When the node is disconnected, the susceptance matrix of the distribution network is calculated. The susceptance matrix is: Wherein, B0 is the susceptance matrix of the distribution network before the node is disconnected, A Δ is the correlation matrix composed of the correlation vectors of the affected branches, The branch susceptance change matrix of the branch where the node is located before the node is disconnected; The active power flow column vector P of the affected branch when the distribution network is in a steady state is calculated according to the susceptance matrix of the distribution network: ml =B'θ, where θ is the voltage phase angle vector of the node; Establish the second equation ΔP k =D k P ml , where D k is the distribution factor vector, P ml is the active power flow vector of the affected branch when the distribution network is in a steady state.

6. The method according to claim 1, characterized in that According to the power flow increment of the affected branch, adjusting the power distribution of the affected power equipment in the distribution network includes: When the power flow increment of the affected branch exceeds a predetermined threshold, power distribution of the affected power equipment in the power distribution network is adjusted.

7. A power flow calculation device for a distribution network, characterized in that: include: A first establishing unit is used to establish a power flow equation of a distribution network, wherein the power flow equation of the distribution network includes a common coupling node power flow equation, a load node power flow equation and a distributed power supply power flow equation, wherein the common coupling node power flow equation is used to calculate the complex power of the common coupling node in the distribution network, the load node power flow equation is used to calculate the complex power of the load node in the distribution network, and the distributed power supply power flow equation is used to calculate the complex power of the distributed power supply in the distribution network; A second establishing unit is used to establish a first equation according to the voltage phase angle of each target branch, the reactance of each target branch and the initial power flow of each target branch when any node in the distribution network is disconnected, wherein the target branch is the branch affected after the node is disconnected, the first equation is used to calculate the power flow increment of the affected branch, and the initial power flow is the power flow of the node or the target branch before the node is disconnected; A first determining unit, configured to determine a ratio of the power flow increment of the target branch to an initial power flow amount of the node as a distribution factor of the target branch; A third establishing unit, configured to form a distribution factor vector by combining the distribution factors of the target branches of the affected branches; a fourth establishing unit, configured to establish a second equation according to the distribution factor vector and the active power flow vector of the affected branch when the distribution network is in a steady state, wherein the second equation is used to calculate the power flow increment of the affected branch; A first calculation unit, configured to calculate the power flow increment of the affected branch by combining the power flow equation of the distribution network, the first equation and the second equation; The first control unit is used to adjust the power distribution of the affected power equipment in the distribution network according to the power flow increment of the affected branch.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A distribution network power flow calculation system, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 6.

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