An equipotential loop network branch power flow determination method, device and medium thereof

Abstract

The application discloses an equipotential loop network branch power flow determination method and device and a medium thereof, relates to the power system power flow calculation technical field, and is used for providing a method for power flow calculation in the equipotential loop network scene, aiming at the problem that the current power flow calculation method cannot calculate the power flow of each branch of the equipotential loop network, providing an equipotential loop network branch power flow determination method, replacing the resistance, reactance and other parameters by taking the outgoing line current and the incoming line current of each node of the equipotential loop network or the outgoing line power and the incoming line power as electrical parameters to perform the branch power flow calculation of the loop network, so that the calculation of the branch power flow can be realized even in the application scene of the equipotential loop network, the problem that the current power flow calculation method cannot calculate the power flow of the equipotential loop network branch is solved, the vacancy of the existing power flow calculation in the application scene of the equipotential loop network is made up, and the stable operation of the power system is further ensured.

Description

Technical Field

[0001] This application relates to the field of power flow calculation technology, and in particular to a method, device and medium for determining the power flow of equipotential ring network branches. Background Technology

[0002] In practical power flow calculations, methods such as the Newton-Raphson method, Gauss-Seidel method, and forward-backward substitution are commonly used, employing electrical parameters like resistance and reactance to calculate power flow. However, in real-world scenarios, power systems may occasionally exhibit a configuration with segmented double busbars or double busbars each having its own segment. The busbars are connected via bus couplers, which in turn are connected by circuit breakers. When all circuit breakers in the bus couplers are closed, the impedance between the busbars becomes negligible, creating an equipotential ring network. Current power flow calculation methods are therefore unable to calculate the power flow of the ring network branches within this equipotential ring network.

[0003] In the application scenario of an equipotential ring network, the impedance between buses can be ignored. Therefore, the current method of calculating power flow by impedance cannot calculate the current of the ring network branches within the equipotential ring network. It can only treat this equipotential ring network as a node and calculate the power flow outside the equipotential ring network.

[0004] Therefore, those skilled in the art urgently need a method for determining the power flow of equipotential ring network branches to solve the problem that current power flow calculation methods cannot determine the power flow of ring network branches within an equipotential ring network. Summary of the Invention

[0005] The purpose of this application is to provide a method, device and medium for determining the power flow of equipotential ring network branches, and to solve the problem that current power flow calculation methods cannot determine the power flow of ring network branches within an equipotential ring network.

[0006] To address the aforementioned technical problems, this application provides a method for determining the branch power flow in an equipotential ring network, comprising:

[0007] The equipotential ring network in the power system is equivalent to a single point, and the electrical parameters of each node in the equipotential ring network are determined through power flow calculations; where the electrical parameters are outgoing current and incoming current, or, the electrical parameters are outgoing power and incoming power.

[0008] The power flow of each branch of the equipotential ring network is determined based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch networks.

[0009] Preferably, the electrical parameters are outgoing current and incoming current. Correspondingly, the power flow of each branch of the equipotential ring network is determined based on the electrical parameters of the nodes, including:

[0010] The incoming or outgoing lines of each node are converted into one outgoing line, so that the outgoing current and incoming current are integrated into a final current value according to the preset rules, and each node is renumbered according to the preset rules.

[0011] The current values ​​of each branch of the equipotential ring network are determined based on the final current values ​​of each node and the first formula.

[0012] The first formula is:

[0013]

[0014] This represents the final current value at the i-th node. This represents the current value of the ring network branch between the i-th node and the j-th node, and n represents the total number of nodes in the equipotential ring network.

[0015] Preferably, the electrical parameters are outgoing line power and incoming line power. Correspondingly, the power flow of each branch of the equipotential ring network is determined based on the electrical parameters of the nodes, including:

[0016] Each node's incoming or outgoing line is converted into an outgoing line, so that the outgoing power and incoming power are integrated into an apparent power value according to preset rules, and each node is renumbered according to preset rules.

[0017] The power values ​​of each branch of the equipotential ring network are determined based on the final power values ​​of each node and the second formula.

[0018] The second formula is:

[0019]

[0020] P i -jQ i P represents the conjugate complex number of the apparent power value of the i-th node. ij -jQ ij denoted by the conjugate complex number of the apparent power value of the ring network branch between the i-th node and the j-th node, and n represents the total number of nodes in the equipotential ring network.

[0021] Preferably, the preset rule is:

[0022] The final current and final power values ​​are positive when flowing out of the node and negative when flowing into the node; the node numbering order is clockwise or counterclockwise from 1 to n; the current direction of the ring network branch is from the smaller number to the larger number, and the current direction between node n and node 1 is from node n to node 1.

[0023] To address the aforementioned technical problems, this application also provides an equipotential ring network branch power flow determination device, comprising:

[0024] The acquisition module is used to convert the equipotential ring network in the power system into a single point and determine the electrical parameters of each node of the equipotential ring network through power flow calculation; wherein, the electrical parameters are outgoing line current and incoming line current, or, the electrical parameters are outgoing line power and incoming line power;

[0025] The determination module is used to determine the power flow of each branch of the equipotential ring network based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch networks.

[0026] To address the aforementioned technical problems, this application also provides an equipotential ring network branch power flow determination device, comprising:

[0027] Memory, used to store computer programs;

[0028] A processor is used to execute computer programs to implement the steps of the above-described method for determining the branch power flow of an equipotential ring network.

[0029] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for determining the power flow of equipotential ring network branches.

[0030] This application provides a method for determining the branch power flow of an equipotential ring network. It uses the outgoing and incoming currents, or outgoing and incoming power, of each node in the equipotential ring network as electrical parameters to calculate the branch power flow. Even in applications where the potential difference between buses in an equipotential ring network is negligible in power flow and short-circuit current calculations, the power flow of the equipotential ring network branches can still be calculated using the incoming and outgoing currents or power of each node. This solves the problem that current power flow calculation methods cannot calculate the branch power flow of equipotential ring networks. Furthermore, since power flow calculation is the most basic and crucial analysis in power system analysis, for planned power systems, the inability to determine the power flow makes it impossible to verify whether the proposed power system planning scheme can meet the requirements of various operating modes. For operating power systems, the inability to determine the power flow makes it impossible to predict whether various load changes and network structure alterations will endanger system safety, whether the voltage of all buses in the system is within the allowable range, whether various components (lines, transformers, etc.) in the system will experience overload, and what preventative measures should be taken in advance when overload may occur. Therefore, the power flow determination method for equipotential ring network branches provided in this application fills the gap in the existing power flow calculation in the application scenario of equipotential ring networks, and further ensures the stable operation of the power system.

[0031] The equipotential ring network branch power flow determination device and computer-readable storage medium provided in this application correspond to the above-mentioned method and have the same effect. Attached Figure Description

[0032] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a structural diagram of an equipotential ring network formed by segmented connection of two busbars.

[0034] Figure 2 A flowchart of a method for determining the branch power flow of an equipotential ring network provided by the present invention;

[0035] Figure 3 This is a structural diagram of an n-node equipotential ring network;

[0036] Figure 4 This is a structural diagram of a single ring network;

[0037] Figure 5 This is a diagram of a single-ring network structure given the current of one branch of the ring network.

[0038] Figure 6 This is a diagram of a ring network structure with three superimposed nodes;

[0039] Figure 7 A simulation structure diagram of a simulation example provided by the present invention;

[0040] Figure 8 A structural diagram of an equipotential ring network branch power flow determination device provided by the present invention;

[0041] Figure 9 This is a structural diagram of another equipotential ring network branch power flow determination device provided by the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0043] The core of this application is to provide a method, device, and medium for determining the power flow of equipotential ring network branches.

[0044] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In practical applications, various power systems need to be analyzed. The most fundamental aspect of power system analysis is calculating power flow. Power flow calculation involves determining the steady-state operating parameters of different parts of the power system based on a given power grid structure, parameters, and the operating conditions of generators, loads, and other components. Commonly used power flow calculation methods include the Newton-Raphson method, the Gauss-Seidel method, and the forward-backward substitution method, primarily using parameters such as resistance and reactance for power flow calculation.

[0046] However, there is a special application scenario where the power system has a double busbar segmented connection or a double busbar with separate segments. An example diagram is shown below. Figure 1 As shown, there are two segmented busbars, which is equivalent to having four busbars (the bolded segments containing nodes 1, 2, 3, and 4). The busbars are connected by bus couplers, with two incoming lines and two outgoing lines. The arrows indicate the direction of current flow. Based on the above connection relationships, Figure 1 The structure shown forms a simple equipotential ring network, and the impedance between the busbars can be ignored.

[0047] exist Figure 1 In the equipotential ring network shown, since the impedance between buses is negligible (equivalent to 0), it is impossible to calculate the power flow of each branch using commonly used power flow calculation methods. Instead, the power flow outside the equipotential ring network can only be calculated by treating the equipotential ring network as a single node. Figure 1 In the middle, that is, the power on the incoming and outgoing lines (P1+jQ1, P2+jQ2, P3+jQ3, P4+jQ4), but the power of the branches between each node (P) cannot be calculated. 12 +jQ 12 P 23 +jQ 23 P 34 +jQ 34 P 14 +jQ 14 Therefore, the analysis of the operating status of the power system is not comprehensive or accurate enough, which has adverse effects on maintaining the stable operation of the power system.

[0048] To address the aforementioned problems, this application provides a method for determining the branch power flow in an equipotential ring network, such as... Figure 2 As shown, it includes:

[0049] S11: Equipotential ring networks in the power system are converted into a single point, and the electrical parameters of each node in the equipotential ring network are determined through power flow calculations.

[0050] Among them, the electrical parameters are the outgoing line current and the incoming line current, or the electrical parameters are the outgoing line power and the incoming line power.

[0051] The electrical parameters mentioned above can be obtained using existing power flow calculation methods. Those skilled in the art can select appropriate existing power flow calculation methods to calculate the electrical parameters of each node in the equipotential ring network based on the actual situation.

[0052] S12: Determine the power flow of each branch of the equipotential ring network based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch of the ring network.

[0053] As described above, the electrical parameters can be the outgoing and incoming currents, or the outgoing and incoming power, of each node. Different electrical parameters can determine different power flows, as shown in the following specific implementation methods:

[0054] When the electrical parameters are the outgoing and incoming currents of each node, the incoming or outgoing lines of each node are converted into an outgoing line, so that the outgoing and incoming currents are integrated into a final current value according to a preset rule; wherein the direction of flow from the node is the positive direction.

[0055] The current values ​​of each branch of the equipotential ring network can then be determined according to the following first formula:

[0056]

[0057] This represents the final current value at the i-th node. This represents the current value of the ring network branch between the i-th node and the j-th node, and n represents the total number of nodes in the equipotential ring network.

[0058] It should be noted that, for As mentioned above, the final current value of each node can be determined by the outgoing and incoming currents of that node. Specifically, this involves superimposing all the incoming and outgoing currents of the node to obtain the final current value. In other words, the incoming and outgoing lines of each node are treated as equivalent to an outgoing line, and the current value on that outgoing line is the final current value. Due to the superposition principle, this equivalent method does not affect the calculation accuracy and reduces the number of parameters required for power flow calculation, making the process of determining the power flow simpler.

[0059] By substituting the final current values ​​of each node into the first formula, the current values ​​of each branch of the equipotential ring network can be obtained. In specific implementations, a corresponding model can be established based on the first formula. When power flow calculations for the equipotential ring network are required, the obtained final current values ​​are input into this model, and the output results are used as the power flow calculation results, making power flow calculations for the equipotential ring network more convenient and faster. Alternatively, the electrical parameters of each node can also be used as input to obtain the power flow calculation results; this embodiment does not impose any restrictions on this.

[0060] Similarly, when the electrical parameters are the outgoing and incoming power of each node, the incoming or outgoing lines of each node are converted into an outgoing line, so that the outgoing and incoming power are integrated into an apparent power value according to the preset rules, and each node is renumbered according to the preset rules.

[0061] At this point, the power flow calculation of the equipotential ring network can be performed using the second formula, which determines the power of each branch of the equipotential ring network as follows:

[0062]

[0063] P i -jQ i P represents the final power value of the i-th node. ij -jQ ij This represents the power value of the ring network branch between the i-th node and the j-th node.

[0064] Similarly, the final power value of each node is a unique power value determined by the sum of all incoming and outgoing power at that node, thereby reducing the number of parameters in power flow calculation. In practical implementation, a corresponding model can be established based on the second formula, and the obtained final power value or electrical parameters can be input into the corresponding model to obtain the output result as the result of power flow calculation.

[0065] Furthermore, as mentioned above, to facilitate calculations, it is necessary to renumber each node of the equipotential ring network according to certain rules. Based on this, this embodiment provides a preferred scheme with preset rules, and the power flow direction and numbering of the ring network branches are specified as follows:

[0066] The final current value and the final power value are defined with the direction of flow out of the node as positive and the direction of flow into the node as negative; the node numbering order is from 1 to n in a clockwise or counterclockwise direction; the current direction of the ring network branch is from the smaller number to the larger number, and the current direction between node n and node 1 is from node n to node 1.

[0067] It should also be noted that the above embodiments provide implementation schemes corresponding to different electrical parameters, and the results obtained are different, but they are all part of the equipotential ring network power flow calculation. It is easy to understand that those skilled in the art can choose the appropriate implementation scheme to perform the power flow calculation of the equipotential ring network according to actual needs. There are cases where it is necessary to calculate the current value and power value of each branch of the equipotential ring network. In this case, the required power flow calculation results can be obtained through the above embodiments. This application is not limited to performing the above-mentioned equipotential ring network branch power flow determination method only once, or performing the equipotential ring network branch power flow determination method for only one branch case.

[0068] Finally, it is easy to see that the power flow calculation for equipotential ring network branches is to calculate the power flow between adjacent nodes. In the above description, nodes with node numbers differing by 1 are considered adjacent nodes by default. Here, a preferred node numbering method in actual implementation is explained:

[0069] For example, such as Figure 3 As shown, there exists an equipotential ring network with n nodes and n branches. Starting from any node and numbering it 1, the other nodes are numbered in a clockwise or counter-clockwise order. The current direction in each branch is from the node with the smallest number to the node with the largest number. Figure 3 In the diagram, the arrows indicate the direction of the current in the ring network branch.

[0070] It is easy to understand that the above-mentioned node numbering method is only a preferred implementation scheme, which is applicable to the first formula and the second formula. What those skilled in the art can easily do is to freely adjust the node numbering method according to actual needs and adaptively modify the first formula and the second formula.

[0071] This application provides a method for determining the power flow of branches in an equipotential ring network. By using the outgoing and incoming currents, or outgoing and incoming power, of each node in the equipotential ring network as electrical parameters, it avoids the problem that in the application scenario of an equipotential ring network, the power flow between buses can be ignored, making it impossible to calculate the power flow of each branch using existing power flow calculation methods. The method provided in this application expands the application scope of power flow calculation, enabling the calculation of power flow in branches even when an equipotential ring network exists in the power system. Based on the power flow calculation results, a more accurate judgment of the operating status of the power system can be made, further ensuring the safe and stable operation of the power system.

[0072] As can be seen from the above, the above embodiments provide a preferred scheme for calculating the power flow of equipotential ring networks. The current and power values ​​of each branch of the equipotential ring network can be quickly calculated using the first formula and the second formula. To further illustrate the method for determining the power flow of equipotential ring network branches provided in this application, the principle and derivation process of the equipotential ring network branch power flow solution method are explained in detail below:

[0073] For example, to facilitate derivation, we take a simple equipotential ring network as an example, a single ring network, such as... Figure 4 As shown. Figure 4 The single ring network shown has three nodes, each with one incoming or outgoing line. Since the derived network is an equipotential ring network, the nodes are short-circuited by lines. The current direction of the incoming or outgoing lines of the nodes is as follows: Figure 4 The middle arrow points to.

[0074] If the current in any one branch of a ring network is known, the currents in the other branches can be calculated using the given information. Based on this, the current of one ring network branch can be given sequentially to calculate the currents of the other bus couplers.

[0075] like Figure 5 As shown, the branch current between node 1 and node 2 is given. Sometimes, as well as Similarly, given the branch current between node 2 and node 3... Sometimes, as well as Given the branch current between node 1 and node 3 Sometimes, as well as

[0076] To obtain the current of a given ring network branch The relationship between the current of each ring network branch and the actual current of the ring network branch is given above as different branch currents. The three types of single ring networks are superimposed according to the node numbers to obtain Figure 6 The ring network shown has three nodes. For ease of derivation, the current injected into the external nodes is assumed to remain constant. According to the principle of power conservation, the current through each branch of the ring network is also equal, i.e.:

[0077]

[0078] Therefore, the current in the ring network branch is:

[0079]

[0080] As can be seen from the above, different The calculated branch currents of the ring network are also different, which is obviously incorrect. To determine... The relationship between the currents and actual ring network branch currents, and its extension to equipotential ring networks with n nodes and n ring network branches, will be discussed below based on the above derivation process. Figure 3 Further derivation of the equipotential ring network with n nodes shown:

[0081] Similar to the above, the branch current of any ring network branch is set as... Therefore, given that the final current values ​​of the remaining nodes are determined, the branch currents of other branches can be obtained through... Sure.

[0082] For example, given the current in the ring network branch between node n and node 1, The currents of each ring network branch are shown below:

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

[0089] Given the current in the ring network branch between node 1 and node 2, The currents in each branch of the ring network have the following relationship:

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096] Similarly, given the currents in the ring network branch between node 3 and node 4:

[0097]

[0098]

[0099]

[0100]

[0101]

[0102]

[0103] Based on the above derivation, it is easy to see how to determine the current of other ring network branches given the current of other nodes. This embodiment will not elaborate on this further.

[0104] By sequentially determining the current of each given branch of the ring network and the relationship between the given branch current and the currents of other branches of the ring network, we obtain n sets of equations relating the given branch current to the currents of other branches. Combining these n sets of equations, we get:

[0105]

[0106]

[0107]

[0108]

[0109]

[0110]

[0111] Extracting the common factors from the above equation and rewriting it in matrix form yields:

[0112]

[0113] From the above equation, it can be seen that the initially given ring network branch current Instead of being eliminated, it becomes the magnitude of the circulating current in this ring network. In an equipotential ring network, after unblocking at any position, the voltage difference between the open ends is 0, meaning no circulating current can form within the ring network. The value is 0, therefore, it can be eliminated. That is, during the derivation process, the ring network branches should be disconnected sequentially to derive the current formula for the ring network branches. At this point, we have:

[0114]

[0115] That is, we get the first formula above. By substituting the final current value of each node into the formula, we can get the current value of each branch of the equipotential ring network.

[0116] Based on the relationship between power and current, the first formula can be rewritten in terms of power, resulting in:

[0117]

[0118] Since the voltages are equal in an equipotential ring network, we can cancel out the voltage values ​​to obtain:

[0119]

[0120] That is, the second formula mentioned above. This completes the derivation of the first and second formulas provided in the above embodiments.

[0121] By using the first and second formulas, given the current or power flowing into and out of each node of the equipotential ring network, the current or power at each branch of the equipotential ring network can be obtained, thereby realizing the power flow calculation of the equipotential circulating current. This fills the gap in the application scope of current power flow calculation methods and is beneficial for analyzing the operating status of the power system.

[0122] Similarly, to further illustrate the method for determining the branch power flow of an equipotential ring network provided in this application, two examples are provided below in conjunction with practical application scenarios.

[0123] Example 1: MATLAB simulation of power flow in a branch of a 3-node equipotential ring network.

[0124] like Figure 7 As shown, a simulation model was built using MATLAB, including: two constant current sources, two constant loads, six current test points (i1, i2, i3, i12, i23, i13) and three circuit breakers (Break1, Break2, Break3).

[0125] Two constant current sources are connected to node 1 and node 2 respectively. The current value of the constant current source connected to node 1 is 200A, and the current value of the constant current source connected to node 2 is 80A.

[0126] The two constant loads are connected to node 2 and node 3 respectively. The constant load connected to node 2 has a load value of 80W, and the constant load connected to node 3 has a load value of 60W.

[0127] Three circuit breakers are respectively installed on the branch formed between the three nodes. Break1 is located on the branch between node 1 and node 2; Break2 is located on the branch between node 2 and node 3; and Break3 is located on the branch between node 1 and node 3.

[0128] In the current test points, i1 is set at the incoming line of node 1 and connected to node 1 to detect the final current value of node 1; i2 is set at the outgoing line of node 2 and connected to node 2 to detect the final current value of node 2; i1 is set at the outgoing line of node 3 and connected to node 3 to detect the final current value of node 3; i12 is set at the branch between node 1 and node 2 to detect the branch current between node 1 and node 2; i23 is set at the branch between node 2 and node 3 to detect the branch current between node 2 and node 3; and i13 is set at the branch between node 1 and node 3 to detect the branch current between node 1 and node 3.

[0129] Based on the above settings, the data for the three circuit breakers under different open and closed states are shown in Table 1 below:

[0130] Table 1. MATLAB simulation results of power flow in the 3-node equipotential ring network branches.

[0131]

[0132] The current in the ring network branches under fully closed circuit breaker conditions was calculated using the Newton-Raphson power flow method built into MATLAB. It should be noted that in the MATLAB simulation, the impedance of the equipotential ring network branches is not zero, but rather a number close to zero. Therefore, the current value of each branch can be determined using the Newton-Raphson method to verify the power flow determination method for equipotential ring network branches provided in this application using actual values.

[0133] Substituting the data from Break1, Break2, and Break3 in Table 1 into the first formula above (note the change in sign due to the direction of the current), we get:

[0134]

[0135] Considering the current direction, a comparison with the data in Table 1 shows that the calculation results are consistent with the power flow calculation results obtained by the Newton-Raphson method in MATLAB.

[0136] Example 2: 220kV double busbars are segmented, and the bus couplers are fully closed.

[0137] The specific structure of Example 2 is as follows Figure 1 As shown, the connection relationship has been explained above and will not be repeated here.

[0138] The incoming and outgoing power of each node were measured and is shown in Table 2.

[0139] Table 2 Actual 220kV Double Busbar and Bus Tie Data

[0140]

[0141] Substituting the corresponding data from Table 2 (i.e., the data from the first four rows) into the second formula, we get:

[0142]

[0143] Comparing the results with the actual data in Table 2 (the last four rows), we can see that the results are close to the actual data, with an error within 5%. In actual power flow calculations, errors can arise from both the data acquisition and calculation processes, with the data acquisition process having the greatest impact. Therefore, it is generally ideal for the power flow calculation results to be within 5%, and in extreme cases, an error within 10% is also acceptable. As demonstrated by the above example, the power flow determination method for equipotential ring network branches provided in this application yields results with relatively small errors, especially compared to the errors in the data acquisition process. The overall power flow determination process typically has an error of no more than 5%, and in extreme cases, no more than 10%, which meets the needs of practical engineering.

[0144] In the above embodiments, a method for determining the power flow of equipotential ring network branches has been described in detail. This application also provides an embodiment corresponding to an equipotential ring network branch power flow determination device. It should be noted that this application describes the device portion of the embodiment from two perspectives: one based on functional modules and the other based on hardware.

[0145] From the perspective of functional modules, this embodiment provides a device for determining the power flow of equipotential ring network branches, such as... Figure 8 As shown, it includes:

[0146] The acquisition module 21 is used to acquire the electrical parameters of each node of the equipotential ring network; wherein, the electrical parameters are outgoing current and incoming current, or, the electrical parameters are outgoing power and incoming power;

[0147] The determination module 22 is used to determine the power flow of each branch of the equipotential ring network based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch of the ring network.

[0148] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0149] The equipotential ring network branch power flow determination device provided in this embodiment acquires the outgoing and incoming currents, or outgoing and incoming power, of each node in the equipotential ring network as electrical parameters through an acquisition module. Then, the determination module performs power flow calculation on the above electrical parameters, thereby avoiding the problem that in the application scenario of equipotential ring networks, the power flow between buses can be ignored, and it is impossible to calculate the power flow of each branch using existing power flow calculation methods.

[0150] Figure 9 A structural diagram of an equipotential ring network branch power flow determination device provided in another embodiment of this application is shown below. Figure 9 As shown, an equipotential ring network branch power flow determination device includes: a memory 30 for storing computer programs;

[0151] The processor 31 is used to execute a computer program to implement the steps of a method for determining the branch power flow of an equipotential ring network as described in the above embodiment.

[0152] The equipotential ring network branch power flow determination device provided in this embodiment can include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0153] The processor 31 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 31 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 31 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 31 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 31 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0154] The memory 30 may include one or more computer-readable storage media, which may be non-transitory. The memory 30 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 30 is used to store at least the following computer program 301, which, after being loaded and executed by the processor 31, can implement the relevant steps of the equipotential ring network branch power flow determination method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 30 may also include an operating system 302 and data 303, and the storage method may be temporary or permanent storage. The operating system 302 may include Windows, Unix, Linux, etc. The data 303 may include, but is not limited to, an equipotential ring network branch power flow determination method.

[0155] In some embodiments, an equipotential ring network branch power flow determination device may further include a display screen 32, an input / output interface 33, a communication interface 34, a power supply 35, and a communication bus 36.

[0156] Those skilled in the art will understand that Figure 9 The structure shown does not constitute a limitation on an equipotential ring network branch power flow determination device and may include more or fewer components than shown.

[0157] This application provides an equipotential ring network branch power flow determination device, which includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method: an equipotential ring network branch power flow determination method.

[0158] This embodiment provides an equipotential ring network branch power flow determination device. Through a processor executing a computer program stored in memory, it performs power flow calculations using the outgoing and incoming currents, or outgoing and incoming power, of each node in the equipotential ring network as electrical parameters. This avoids the problem that in the application scenario of an equipotential ring network, the interactions between buses can be ignored, making it impossible to calculate the power flow of each branch using existing power flow calculation methods. The aforementioned power flow calculation method expands the application scope of power flow calculation, enabling the calculation of power flow in branches even when an equipotential ring network exists in the power system, which is beneficial for understanding the operating status of the power system.

[0159] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0160] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0161] This embodiment provides a computer storage medium that, by executing a computer program stored therein, enables the acquisition of outgoing and incoming currents, or outgoing and incoming power, of each node in an equipotential ring network as electrical parameters for power flow calculation. This extends existing power flow calculation methods to be applicable to calculating branch power flows in equipotential ring networks, further ensuring the safe and stable operation of the power system.

[0162] The foregoing provides a detailed description of the method, apparatus, and medium for determining the branch power flow of an equipotential ring network provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0163] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for determining the branch power flow in an equipotential ring network, characterized in that, include: The equipotential ring network in the power system is equivalent to a single point, and the electrical parameters of each node in the equipotential ring network are determined through power flow calculations; wherein, the electrical parameters are outgoing line current and incoming line current, or, the electrical parameters are outgoing line power and incoming line power; The power flow of each branch of the equipotential ring network is determined based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch. Wherein, when the electrical parameters are the outgoing line current and the incoming line current, determining the ring network branch power flow of each branch of the equipotential ring network based on the electrical parameters of the node includes: The incoming or outgoing lines of each node are converted into a single outgoing line, and the outgoing current and the incoming current are integrated into a final current value according to a preset rule. The nodes are then renumbered according to the preset rule. The current value of each branch of the equipotential ring network is determined based on the final current value of each node and the first formula. The first formula is obtained by eliminating the circulation term under the condition that the circulation is zero, and is as follows: This represents the final current value of the i-th node. The value of the current in the ring network branch between the i-th node and the j-th node is represented by n, where n represents the total number of nodes in the equipotential ring network. Alternatively, when the electrical parameters are the outgoing line power and the incoming line power, the corresponding step of determining the ring network branch power flow of each branch of the equipotential ring network based on the electrical parameters of the node includes: The incoming or outgoing lines of each node are converted into an outgoing line, and the outgoing power and the incoming power are integrated into an apparent power value according to a preset rule. The nodes are then renumbered according to the preset rule. The power values ​​of each branch of the equipotential ring network are determined based on the final power values ​​of each node and the second formula. The second formula is: Let represent the conjugate complex number of the apparent power value of the i-th node. The conjugate complex number represents the apparent power value of the ring network branch between the i-th node and the j-th node, and n represents the total number of nodes in the equipotential ring network.

2. The method for determining the branch power flow of an equipotential ring network according to claim 1, characterized in that, The preset rule is as follows: The final current value and the final power value are defined with the direction of flow out of the node as positive and the direction of flow into the node as negative; the node numbering order is from 1 to n in a clockwise or counterclockwise direction; the current direction of the ring network branch is from the smaller number to the larger number, and the current direction between node n and node 1 is from node n to node 1.

3. A device for determining the power flow of equipotential ring network branches, characterized in that, Apply the equipotential ring network branch power flow determination method as described in claim 1 or 2; The device includes: The acquisition module is used to convert the equipotential ring network in the power system into a single point and determine the electrical parameters of each node of the equipotential ring network through power flow calculation; wherein, the electrical parameters are outgoing line current and incoming line current, or, the electrical parameters are outgoing line power and incoming line power; The determination module is used to determine the power flow of each branch of the equipotential ring network based on the electrical parameters of each node, so as to determine the operating status of the power system in which the equipotential ring network is located based on the power flow of the branch of the ring network.

4. A device for determining the power flow of an equipotential ring network branch, characterized in that, include: Memory, used to store computer programs; A processor is configured to execute the computer program to implement the steps of the equipotential ring network branch power flow determination method as described in claim 1 or 2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the equipotential ring network branch power flow determination method as described in claim 1 or 2.

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