Method and device for loss allocation of ac-dc transmission system and computer equipment

Abstract

This application relates to a method, apparatus, and computer equipment for allocating network losses in an AC / DC transmission system. The method includes: obtaining AC node parameters for a pure AC node, and first and second DC node parameters for a DC node; obtaining third DC node parameters for the DC node based on the first and second DC node parameters; inputting the AC node parameters, first DC node parameters, and third DC node parameters into a marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes; obtaining the DC network loss allocation for multiple grid nodes; and obtaining the total network loss allocation for multiple grid nodes based on the AC and DC network loss allocations. This method can obtain the total network loss allocation through the marginal network loss coefficient model, thereby improving the reliability of network loss allocation.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a method, apparatus and computer equipment for allocating network losses in AC / DC transmission systems. Background Technology

[0002] Network losses are power losses dissipated as heat during power transmission. They are unavoidable energy losses in electricity trading and cannot be ignored in power system operation, control, and management. In the power system, how to fairly, justly, accurately, and reasonably allocate network losses to each grid node is one of the key issues concerning the healthy development of the electricity market, an important aspect of transmission pricing, and a fundamental requirement for fair competition in the electricity market.

[0003] Currently, research on network loss allocation methods for AC / DC transmission systems mainly focuses on the postage stamp method and the power flow tracing method. The power flow tracing method primarily calculates the degree of network loss utilization of each node for a specific line based on the actual power flow of each line in the system and the principle of proportional sharing, thereby allocating network losses. However, the current power flow tracing method lacks reliability for network loss allocation in AC / DC transmission systems. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, and computer equipment for allocating network losses in AC / DC transmission systems that can improve the reliability of network loss allocation in AC / DC transmission systems, in order to address the aforementioned technical problems.

[0005] Firstly, this application provides a method for allocating network losses in an AC / DC transmission system. The AC / DC transmission system includes multiple grid nodes; these grid nodes include purely AC nodes and DC nodes. The method includes:

[0006] Obtain the AC node parameters of the pure AC node, and the first DC node parameters and the second DC node parameters of the DC node;

[0007] Based on the parameters of the first and second DC nodes, the parameters of the third DC node are obtained; the parameters of the third DC node are the partial derivatives of the reactive power of the DC node with respect to the voltage amplitude.

[0008] Input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple power grid nodes;

[0009] Obtain the DC network loss allocation for multiple power grid nodes;

[0010] Based on the AC network loss allocation and the DC network loss allocation, the total network loss allocation for multiple power grid nodes is obtained.

[0011] In one embodiment, the AC node parameters, the first DC node parameters, and the third DC node parameters are input into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes, including:

[0012] Input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the active power marginal coefficient of each grid node;

[0013] The AC network loss allocation is obtained based on the active power marginal coefficient and the active power of the corresponding grid node.

[0014] In one embodiment, before inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model, the marginal network loss coefficient model is obtained in the following manner:

[0015] For each pure AC node, take the partial derivative of the active power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node, and take the partial derivative of the reactive power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node.

[0016] In one embodiment, after inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes, the method further includes:

[0017] Obtain the correction factor, and adjust the AC network loss allocation based on the correction factor to obtain the corrected AC network loss allocation.

[0018] Based on the corrected AC and DC network loss allocations, the total network loss allocation for multiple grid nodes is obtained.

[0019] In one embodiment, obtaining the correction coefficient includes:

[0020] The correction coefficient is obtained based on the actual total network loss of the AC network, the AC network loss allocation, and the number of grid nodes in the AC / DC transmission system.

[0021] In one embodiment, the AC node parameters include a first AC voltage amplitude and an AC node phase angle difference; the first DC node parameters include a second AC voltage amplitude and an AC / DC node phase angle difference.

[0022] Obtain the AC node parameters of the pure AC node, and the first DC node parameters of the DC node, including:

[0023] For each pure AC node, obtain the active power and reactive power of the pure AC node, and obtain the real part and imaginary part of the branch admittance between the pure AC node and any grid node.

[0024] Based on the active power of the pure AC node, the reactive power of the pure AC node, the real part of the branch admittance, and the imaginary part of the branch admittance, the first AC voltage amplitude, the AC node phase angle difference, the second AC voltage amplitude, and the AC / DC node phase angle difference are obtained.

[0025] In one embodiment, obtaining the DC network loss allocation for multiple grid nodes includes:

[0026] Preprocessing is performed on the DC lines of the AC / DC transmission system to obtain lossless lines;

[0027] Based on the lossless line, the power share of each power grid node is obtained;

[0028] Based on the power share of each node, the DC network loss allocation for multiple grid nodes is obtained.

[0029] Secondly, this application also provides a network loss sharing device for an AC / DC transmission system. The AC / DC transmission system includes multiple grid nodes; the multiple grid nodes include pure AC nodes and DC nodes. The device includes:

[0030] The node parameter acquisition module is used to acquire the AC node parameters of the pure AC node, as well as the first DC node parameters and the second DC node parameters of the DC node.

[0031] The DC reactive power module is used to obtain the third DC node parameter of the DC node based on the first DC node parameter and the second DC node parameter; the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude.

[0032] The marginal network loss coefficient module is used to input AC node parameters, first DC node parameters, and third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation of multiple power grid nodes;

[0033] The DC network loss acquisition module is used to acquire the DC network loss allocation of multiple power grid nodes;

[0034] The total network loss allocation module is used to obtain the total network loss allocation for multiple power grid nodes based on the AC network loss allocation and the DC network loss allocation.

[0035] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0036] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the above-described method.

[0037] The aforementioned AC / DC transmission system loss allocation method, device, and computer equipment obtain AC node parameters for pure AC nodes, and first and second DC node parameters for DC nodes; and based on the first and second DC node parameters, obtain third DC node parameters for DC nodes; wherein, the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude; thus, the influence of the reactive power of the DC node on the marginal network loss coefficient can be considered; the AC node parameters, first DC node parameters, and third DC node parameters can be input into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes; the DC network loss allocation for multiple grid nodes can be obtained; and the total network loss allocation for multiple grid nodes can be obtained based on the AC network loss allocation and the DC network loss allocation. In this way, the marginal network loss coefficient can be applied to the network loss allocation method of AC / DC transmission systems to obtain the AC network loss allocation. Furthermore, the total network loss allocation of each grid node can be obtained through the AC network loss allocation and the DC network loss allocation. The total network loss allocation can be obtained through the marginal network loss coefficient model, thereby improving the reliability of network loss allocation. Considering the impact of reactive power of DC nodes on the marginal network loss coefficient further improves the reliability of network loss allocation. Attached Figure Description

[0038] Figure 1 This is a diagram illustrating the application environment of a network loss allocation method for an AC / DC transmission system in one embodiment.

[0039] Figure 2 This is a flowchart illustrating a method for allocating network losses in an AC / DC transmission system in one embodiment.

[0040] Figure 3 This is a flowchart illustrating a network loss sharing method for an AC / DC transmission system in another embodiment.

[0041] Figure 4 This is a flowchart illustrating the process of obtaining the AC node parameters of a pure AC node and the first DC node parameters of a DC node in one embodiment.

[0042] Figure 5 This is a schematic diagram of the process for obtaining the DC network loss allocation of multiple power grid nodes in one embodiment;

[0043] Figure 6 This is a schematic diagram of the structure of an AC / DC power transmission system in a specific embodiment;

[0044] Figure 7 This is a schematic diagram comparing the results of the active power marginal coefficient in one embodiment;

[0045] Figure 8 This is a schematic diagram comparing the results of AC network loss allocation in one embodiment;

[0046] Figure 9 This is a structural block diagram of a network loss sharing device for an AC / DC transmission system in one embodiment;

[0047] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] Currently, the main research methods for AC / DC network loss allocation are the stamp method and the power flow tracing method. The specific methods are as follows: (1) Stamp method: First, calculate the network loss of the entire network including DC, and then allocate the network loss according to the active power of each node. (2) Power flow tracing method: Based on the actual power flow of each line in the system, calculate the degree of use of the network loss of a specific line by each node according to the principle of proportional sharing, and allocate the network loss accordingly. For AC networks, in addition to the two methods mentioned above, there is mainly the marginal network loss coefficient method. By calculating the sensitivity factors of the active and reactive power injected by the node and the network loss with respect to the AC node voltage and phase angle, and analyzing the relationship between them, the partial derivative of the network loss with respect to the injected power is calculated, and the network loss is allocated accordingly.

[0050] Among existing AC / DC network loss allocation methods, the stamp method ignores the actual power flow of the system, which can easily lead to cross-subsidies; the power flow tracking method cannot provide effective economic signals to the market to guide changes in active power at nodes, thereby altering the system power flow and reducing network losses. Existing marginal network loss coefficient methods are only discussed in pure AC power grids, and there is currently no research on their application in AC / DC hybrid power grids. Based on the above reasons, this application provides a network loss allocation method for AC / DC transmission systems.

[0051] The network loss sharing method for AC / DC transmission systems provided in this application embodiment can be applied to, for example, Figure 1 In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be integrated onto server 104, or it can be located in the cloud or on other network servers. Terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, and tablets. Server 104 can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0052] In one embodiment, such as Figure 2 As shown, a method for allocating network losses in an AC / DC transmission system is provided, and this method is applied to... Figure 1Taking terminal 102 as an example, the method is explained as follows: An AC / DC transmission system includes multiple grid nodes; these grid nodes include pure AC nodes and DC nodes.

[0053] Step S202: Obtain the AC node parameters of the pure AC node, and the first DC node parameters and the second DC node parameters of the DC node.

[0054] Among them, the AC node parameters can be unknown parameters of pure AC nodes in AC / DC transmission systems under operating conditions. The first DC node parameter can be a parameter related to both DC nodes and pure AC nodes. The second DC node parameter can be an unknown parameter of the DC node. All of the above parameters can be obtained through calculation, and there can be multiple unknown parameters.

[0055] Specifically, the AC node parameters of a pure AC node and the first DC node parameters of a DC node can be calculated using one equation, and the second DC node parameters of a DC node can be calculated using another equation. These equations can be a set of equations or multiple equations used in a step-by-step calculation process. For example, the AC node parameters and the first DC node parameters can be calculated using the power balance equation of the pure AC node; and the second DC node parameters can be calculated using the power balance equation of the DC node.

[0056] Step S204: Based on the first DC node parameters and the second DC node parameters, obtain the third DC node parameters of the DC node.

[0057] Among them, the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude. The reactive power of the DC node can be the reactive power injected into the converter station of the DC node.

[0058] Specifically, the parameters of the first and second DC nodes can be processed to obtain the partial derivative of the reactive power of the DC nodes with respect to the voltage amplitude. This partial derivative can then be incorporated into the calculation of the marginal network loss coefficient model, resulting in a more reliable network loss allocation.

[0059] Step S206: Input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple power grid nodes.

[0060] The marginal network loss coefficient model can be a calculation model based on the marginal network loss coefficient method. The AC network loss allocation can be the network loss allocation of the AC network in an AC / DC transmission system. It can be understood that AC / DC transmission systems can be divided into AC networks and DC networks.

[0061] Specifically, the AC node parameters, the first DC node parameters, and the partial derivatives of the reactive power of the DC nodes with respect to the voltage amplitude can be input into the marginal network loss coefficient model. This allows for the calculation of the AC network loss allocation at each grid node, providing an effective economic signal through the marginal network loss coefficient model. Thus, inputting the partial derivatives of the reactive power of the DC nodes with respect to the voltage amplitude into the marginal network loss coefficient model for more accurate calculations yields a more reliable allocation of AC network losses.

[0062] Step S208: Obtain the DC network loss allocation for multiple power grid nodes;

[0063] Among them, the DC network loss allocation can be the network loss allocation of the DC network in the AC / DC transmission system. The DC network can include one or more DC lines, and the DC lines can be lines that carry out DC power transmission.

[0064] Specifically, the DC network loss allocation for multiple grid nodes can be calculated. It's important to note that not all grid nodes need to be allocated losses; primarily, the grid nodes corresponding to the DC line and their downstream grid nodes need to be allocated losses. The grid nodes corresponding to the DC line are the nodes at both ends of the DC line.

[0065] Step S210: Based on the AC network loss allocation and the DC network loss allocation, obtain the total network loss allocation for multiple power grid nodes.

[0066] Specifically, the total network loss allocation for a power grid node can be calculated based on the AC and DC network loss allocations for each node. As an example, the total network loss allocation for each node can be obtained by summing the AC and DC network loss allocations. It's understandable that the DC network loss allocation for some nodes may be zero.

[0067] In this embodiment, the AC node parameters of the pure AC node and the first and second DC node parameters of the DC node are obtained; and the third DC node parameter of the DC node is obtained based on the first and second DC node parameters; wherein, the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude; thus, the influence of the reactive power of the DC node on the marginal network loss coefficient can be considered; the AC node parameters, the first DC node parameters, and the third DC node parameters can be input into the marginal network loss coefficient model to obtain the AC network loss allocation of multiple grid nodes; the DC network loss allocation of multiple grid nodes is obtained; and the total network loss allocation of multiple grid nodes can be obtained based on the AC network loss allocation and the DC network loss allocation. In this way, the marginal network loss coefficient can be applied to the network loss allocation method of AC / DC transmission systems to obtain the AC network loss allocation. Furthermore, the total network loss allocation of each grid node can be obtained through the AC network loss allocation and the DC network loss allocation. The total network loss allocation can be obtained through the marginal network loss coefficient model, thereby improving the reliability of network loss allocation. Considering the impact of reactive power of DC nodes on the marginal network loss coefficient further improves the reliability of network loss allocation.

[0068] In one embodiment, the AC node parameters, the first DC node parameters, and the third DC node parameters are input into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes, including:

[0069] Input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the active power marginal coefficient of each grid node;

[0070] The AC network loss allocation is obtained based on the active power marginal coefficient and the active power of the corresponding grid node.

[0071] The active power marginal coefficient can be seen as the change in total network loss at a grid node due to the marginal change in injected active power. It can be understood that the active power marginal coefficient corresponds to a grid node; that is, the active power marginal coefficient of a grid node corresponds to that grid node.

[0072] Specifically, the AC node parameters, the first DC node parameters, and the third DC node parameters can be input into the marginal network loss coefficient model. This allows for the calculation of the active power marginal coefficient for each grid node, thus obtaining the active power of each grid node. Furthermore, based on the active power marginal coefficient and the corresponding active power of the grid node, the AC network loss allocation for that grid node can be obtained. In this way, the AC network loss allocation for multiple grid nodes can be obtained.

[0073] In one embodiment, the AC node parameters, the first DC node parameters, and the third DC node parameters are input into the marginal network loss coefficient model to calculate the reactive power marginal coefficient. The reactive power marginal coefficient can represent the change in total network loss caused by the marginal change in injected reactive power at a grid node. In practical engineering applications, network losses should be allocated according to the actual electrical energy consumed by the grid. Therefore, the AC network loss allocation can be obtained based on the active power marginal coefficient and the active power.

[0074] In one embodiment, the AC network loss allocation of the power grid node can be obtained according to the following expression (1):

[0075]

[0076] Among them, L i This represents the AC network loss allocation for any given power grid node. P is the marginal active power coefficient of this power grid node. i1 This represents the active power of the power grid node.

[0077] In this embodiment, the AC network loss allocation of the grid node is obtained based on the marginal coefficient of active power and active power of the grid node. This allows the network loss to be allocated according to the actual power consumption of the grid, which is more in line with the actual situation and can improve the reliability of network loss allocation.

[0078] In one embodiment, before inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model, the marginal network loss coefficient model is obtained in the following manner:

[0079] For each pure AC node, take the partial derivative of the active power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node, and take the partial derivative of the reactive power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node.

[0080] Any grid node includes the pure AC node itself.

[0081] Specifically, for each pure AC node, we can take the partial derivatives of its active power with respect to the voltage amplitude of any grid node, the partial derivatives of its active power with respect to the phase angle of any grid node, the partial derivatives of its reactive power with respect to the voltage amplitude of any grid node, and the partial derivatives of its reactive power with respect to the phase angle of any grid node. This yields the partial derivatives of the active power of the pure AC node with respect to the voltage amplitude of any grid node, the partial derivatives of its active power with respect to the phase angle of any grid node, the partial derivatives of its reactive power with respect to the voltage amplitude of any grid node, and the partial derivatives of its reactive power with respect to the phase angle of any grid node. A marginal network loss coefficient model can be established based on these partial derivatives. Furthermore, the partial derivatives of the reactive power of DC nodes with respect to the voltage amplitude can also be input into the marginal network loss coefficient model.

[0082] In one embodiment, the partial derivative can be calculated according to the following expression (2):

[0083]

[0084] Among them, P i Q is the active power of pure AC node i. i V represents the reactive power of pure AC node i. i V represents the AC voltage amplitude at pure AC node i (i.e., the first AC voltage amplitude). j Let V be the voltage magnitude of any other grid node j (if the grid node is a pure AC node, it is taken as V). j This is the amplitude of the first AC voltage; if the grid node is a DC node, it is taken as V. j (for the second AC voltage amplitude), G ij Let B be the real part of the line admittance of pure AC node i and any other grid node j. ij Let G be the imaginary part of the line admittance of pure AC node i and any other grid node j. ii Let B be the real part of the admittance of node i. ii Let θ be the imaginary part of the admittance of node i. i Let θ be the phase angle of node i. j Let θ be the phase angle of any other power grid node j. ij Let be the phase angle difference between pure AC node i and any other grid node j.

[0085] In one embodiment, when the system node is a PV node, the reactive power of the grid node plays a role in regulating the system voltage. Therefore, no network loss fee is charged for its reactive power, that is, the reactive marginal coefficient of the node is set to 0, and the voltage variable of the grid node should not be written into the equation in subsequent calculations.

[0086] In one embodiment, when the system node is a balancing node, since the balancing node is used to provide the network loss for the whole network in the calculation, no network loss fee is charged to it. That is, the active and reactive marginal coefficients of the node are both 0, and the voltage and phase angle of the grid node should not be written in the subsequent calculation.

[0087] In one embodiment, the partial derivatives of the active power of a pure AC node with respect to the voltage magnitude of any grid node, the partial derivatives of the active power of a pure AC node with respect to the phase angle of any grid node, the partial derivatives of the reactive power of a pure AC node with respect to the voltage magnitude of any grid node, and the partial derivatives of the reactive power of a pure AC node with respect to the phase angle of any grid node are all elements of the Jacobian matrix in power flow calculation. Power flow calculation is a term from electrical engineering, referring to a calculation method used in power systems.

[0088] In this embodiment, by establishing a marginal network loss coefficient model, the AC network loss of each power grid node can be obtained based on the marginal network loss coefficient model and various parameters. Thus, establishing a marginal network loss coefficient model provides the prerequisite for obtaining the AC network loss of each power grid node.

[0089] In one embodiment, such as Figure 3 As shown, after inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation for multiple grid nodes, the model also includes:

[0090] Step S302: Obtain the correction coefficient and correct the AC network loss allocation based on the correction coefficient to obtain the corrected AC network loss allocation.

[0091] Step S304: The corrected AC network loss allocation and DC network loss allocation are used to obtain the total network loss allocation for multiple power grid nodes.

[0092] The correction factor is a coefficient used in the calculation of the AC network loss allocation.

[0093] Specifically, a correction factor can be obtained, and the AC network loss allocation can be corrected based on the correction factor to obtain the corrected AC network loss allocation. The DC network loss allocation can be obtained, and the total network loss allocation for multiple grid nodes can be obtained based on the corrected AC network loss allocation and the DC network loss allocation.

[0094] In one embodiment, the corrected AC network loss allocation can be obtained by the following expression (3):

[0095]

[0096] Among them, L′ i For the corrected AC network loss allocation, L iThis represents the AC network loss allocation for any given power grid node. P is the marginal active power coefficient of this power grid node. i1 This represents the active power of the power grid node.

[0097] In this embodiment, by correcting the AC network loss allocation, an AC network loss allocation that is more consistent with the actual network loss can be obtained, thereby improving the reliability of network loss allocation.

[0098] In one embodiment, obtaining the correction coefficient includes:

[0099] The correction coefficient is obtained based on the actual total network loss of the AC network, the AC network loss allocation, and the number of grid nodes in the AC / DC transmission system.

[0100] The actual total network loss refers to the total network loss of the AC transmission system during actual operation.

[0101] Specifically, the correction coefficient can be obtained based on the actual total network loss of the AC network, the AC network loss allocation of each power grid node, and the number of power grid nodes.

[0102] In one embodiment, the correction coefficient can be obtained by the following expression (4):

[0103]

[0104] Among them, L ac Let n be the actual total network loss of the AC network, and n be the number of pure AC nodes.

[0105] In this embodiment, a correction coefficient is obtained from the actual total network loss of the AC network, which can be used to correct the AC network loss allocation. This makes the total network loss allocation the same as the actual total network loss, further improving the reliability of network loss allocation.

[0106] In one embodiment, such as Figure 4 As shown, the AC node parameters include the first AC voltage amplitude and the AC node phase angle difference; the first DC node parameters include the second AC voltage amplitude and the AC / DC node phase angle difference.

[0107] Obtain the AC node parameters of the pure AC node, and the first DC node parameters of the DC node, including:

[0108] Step S402: For each pure AC node, obtain the active power and reactive power of the pure AC node, and obtain the real part and imaginary part of the branch admittance between the pure AC node and any grid node.

[0109] Step S404: Based on the active power of the pure AC node, the reactive power of the pure AC node, the real part parameter of the branch admittance, and the imaginary part parameter of the branch admittance, the first AC voltage amplitude, the AC node phase angle difference, the second AC voltage amplitude, and the AC / DC node phase angle difference are obtained.

[0110] In this context, the first AC voltage amplitude is the AC voltage amplitude of a pure AC node; the phase angle difference between AC nodes is the difference between the phase angles of any two pure AC nodes; the second AC voltage amplitude is the AC voltage amplitude of a DC node, meaning that DC nodes also have AC voltage; the phase angle difference between AC and DC nodes is the difference between the phase angles of a pure AC node and a DC node; it can be understood that the AC voltage amplitude refers to the amplitude of the AC voltage. Active power refers to the actual AC electrical energy generated or consumed per unit time, which is the average power over the period. Active power is the electrical power that converts electrical energy into other forms of energy (mechanical energy, light energy, heat energy). Reactive power refers to the energy absorbed from the power source by the electric or magnetic field in an AC circuit with reactance during a portion of a period, and released during another portion. The average power is zero over the entire period, but energy is constantly exchanged between the power source and reactive components (capacitors, inductors). Branch admittance is the admittance of the line between two grid nodes.

[0111] Specifically, for each pure AC node, the active and reactive power of the pure AC node are obtained, as well as the real and imaginary parameters of the branch admittance between the pure AC node and any grid node, and these parameters are taken as known quantities. Based on the active power, reactive power, real and imaginary parameters of the branch admittance of the pure AC node, the first AC voltage amplitude, AC node phase angle difference, second AC voltage amplitude, and AC / DC node phase angle difference are calculated to obtain the AC node parameters of the pure AC node and the first DC node parameters of the DC node.

[0112] In one embodiment, the first AC voltage amplitude, the AC node phase angle difference, the second AC voltage amplitude, and the AC / DC node phase angle difference can be obtained by the following expression (5):

[0113]

[0114] Among them, P is Q is V represents the active power and reactive power of pure AC node i, respectively. i V j These are the AC voltage amplitudes (i.e., the first AC voltage amplitude) at the pure AC node i and the voltage amplitudes at other grid nodes j (if the grid node is a pure AC node, it is represented as V). j This is the amplitude of the first AC voltage; if the grid node is a DC node, it is taken as V. j(for the second AC voltage amplitude), G ij B ij θ represents the real and imaginary parts of the line admittance for pure AC node i and any other grid node j, respectively. ij Let P be the phase angle difference between pure AC node i and any other grid node j. is Q is The quantity is known.

[0115] Specifically, the above expression (5) can be calculated using the Newton-Raphson method to obtain the first AC voltage amplitude, the AC node phase angle difference, the second AC voltage amplitude, and the AC / DC node phase angle difference. V i θ represents the amplitude of the AC voltage. ij It can be the phase angle difference between AC nodes or the phase angle difference between AC and DC nodes, which is determined based on whether the grid node j is a pure AC node or a DC node. j It can be either the first AC voltage amplitude or the second AC voltage amplitude, depending on whether the grid node j is a pure AC node or a DC node.

[0116] In this embodiment, the first AC voltage amplitude, AC node phase angle difference, second AC voltage amplitude, and AC / DC node phase angle difference are obtained by using the active power of the pure AC node, the reactive power of the pure AC node, the real part parameter of the branch admittance, and the imaginary part parameter of the branch admittance. This provides the prerequisite for obtaining the AC network loss allocation in subsequent steps.

[0117] In one embodiment, such as Figure 5 As shown, the DC network loss allocation for multiple power grid nodes is obtained, including:

[0118] Step S502: Preprocess the DC lines of the AC / DC transmission system to obtain lossless lines;

[0119] Step S504: Based on the lossless line, obtain the power share of each power grid node;

[0120] Step S506: Based on each power share, obtain the DC network loss allocation for multiple grid nodes.

[0121] Among them, multiple power grid nodes can be all power grid nodes, some power grid nodes, or a single power grid node.

[0122] Specifically, lossless preprocessing can be performed on DC lines in AC / DC systems to transform them into lossless lines. Based on the lossless lines, the contribution of specific loads to the outflow power of each grid node can be calculated, yielding the power share of each grid node. Based on these power shares, the DC network loss allocation for multiple grid nodes can be obtained. The specific allocation of DC network losses depends on the grid node corresponding to the DC line and its downstream connections.

[0123] In this embodiment, the DC line is processed without damage, which can obtain the DC network loss allocation of multiple power grid nodes. This allows the network loss allocation to conform to the actual situation, thereby improving the reliability of the network loss allocation.

[0124] In one embodiment, the second DC parameter node includes the DC voltage amplitude, DC current amplitude, DC phase angle difference, and the power factor angle of the circulating transformer corresponding to the DC node. The second DC node parameters can be obtained through the following expression (6):

[0125]

[0126] Among them, P di The power transmitted or received by the DC line at DC node k. V is the power factor angle of the converter transformer corresponding to DC node k. di I di Let be the DC voltage of the DC system connected to DC node k and the DC current of the transmission line, respectively, and p be the DC line operation level. In the formula, ± correspond to the inverter station and the rectifier station, respectively. Since both the rectifier-converter station and the inverter-converter station need to consume reactive power, the DC term in the reactive power balance equation in the second equation is negative.

[0127] Since DC transmission systems introduce DC variables, additional converter fundamental equations, DC network equations, and control equations are required to form an AC-DC power flow calculation model to calculate the parameters of the second DC node.

[0128] The basic equations of the converter can be obtained from expression (7):

[0129]

[0130] Where, k Tk For the converter transformer turns ratio, δ dk X is the commutation angle of the converter. ck V is the equivalent reactance of the converter station. tk k is the DC node voltage of the AC system. γk It is a constant, with a value of 0.995.

[0131] The DC network equations can be obtained from expression (8):

[0132]

[0133] Among them, g dij V represents the elements of the conductance matrix of the DC network nodes. dj Let I be the voltage amplitude at DC node j. d1 I d2These represent the DC current amplitudes on the inverter side and the rectifier side, respectively. The inverter side and the rectifier side are the two sides of the DC line.

[0134] The governing equations can be obtained from expression (9):

[0135]

[0136] Due to the constraints of the DC network equations, the control variables for each converter station must be independent of each other, d 4k (), d 5k () are all equations whose parameters are independent.

[0137] In one embodiment, in actual operation of the AC / DC transmission system, the conventional DC line control method is constant voltage ratio control on the rectifier side and constant current ratio control on the inverter side, and the control quantities at both ends are given manually according to the system operation or power transmission plan. As shown in expression (8), the voltage and current at both ends of the DC line are known quantities under this control method. According to the DC line network loss formula in expression (10), the DC line network loss is a constant value that does not change, and the same applies to the DC transmission power:

[0138]

[0139] Among them, G dij denoted as the conductance of the DC transmission line, and m as the number of DC nodes.

[0140] In one embodiment, the total network loss of the AC network can be obtained by expression (11):

[0141]

[0142] Where, θ i θ j Let i represent the phase angle of nodes i and j, and n be the number of purely AC nodes.

[0143] Taking the partial derivative of expression (12) with respect to voltage magnitude and phase angle, we get expression (12):

[0144]

[0145] To solve for the marginal coefficient of active power, chain rule differentiation is performed, resulting in expression (13):

[0146]

[0147] in, The active marginal coefficient and reactive marginal coefficient are both parameters to be determined. Equation (12) can be substituted into expression (13) to solve for expression (2). For a pure AC node, the partial derivatives of the node-injected active power and reactive power with respect to voltage amplitude and phase angle are elements in the Jacobian matrix for power flow calculation.

[0148] For DC nodes, substituting expression (7) into expression (6) yields expression (14):

[0149]

[0150] Q di By injecting reactive power into the converter station connected to the DC node, and taking the partial derivative of this variable, we obtain expression (15):

[0151]

[0152] in, This refers to the third DC node parameter, which is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude. The third DC node parameter is based on the second AC voltage amplitude (V) in the first DC node parameter. i ), and the power factor angle in the second DC node parameters (i.e. )get.

[0153] Summing the corresponding terms in expressions (15) and (2) is equivalent to adding the partial derivative of reactive power with respect to voltage amplitude in expression (15) to the partial derivative of reactive power with respect to voltage amplitude in expression (2). This demonstrates the impact of reactive power at DC nodes on the allocation of network losses in the AC network.

[0154] The active power marginal coefficient and reactive power marginal coefficient are calculated using the following expression (16):

[0155]

[0156] In one embodiment, the network loss of a DC line can be calculated using a power flow tracing method. Depending on the tracing object, the method can be divided into two types: downstream tracing and upstream tracing. Downstream tracing calculates the magnitude of the power flow caused by the load power on the transmission line, used to analyze the power share provided by each generator to the load. As an example, this application uses the downstream tracing method to allocate DC network losses. In the DC line, the power flowing out of node DC j is:

[0157]

[0158] Where, α j Let P be the set of all nodes that start at node j and receive input power from that node. ijP represents the line power flowing from DC node j to DC node d. Lj Let be the load power of DC node j.

[0159] For any line jd, we have |P jd |=|P dj |, let C jd =P jd / P d Substituting into expression (17), we get the following expression:

[0160]

[0161] Convert to matrix form:

[0162] A d P d =P L (19)

[0163] Where Ad is the downstream allocation matrix, P d P is the node outflow power vector. L This is the node load power vector.

[0164] in:

[0165]

[0166] Inverting expression (20) yields the contribution of a specific load k to the outflow power at node j:

[0167] P j,Lk =[A d -1 ] jk P jk (twenty one)

[0168] By using the proportional sharing principle, the power share that node j provides to a specific load is obtained:

[0169]

[0170] The DC network loss allocation for the corresponding grid node of the DC line can be obtained through the power share.

[0171] In a specific embodiment, such as Figure 6As shown, taking the modified IEEE 39-node AC / DC transmission system as an example, this AC / DC transmission system has a total of 39 grid nodes, numbered 1 to 39. Lines 4-14 and 21-22 of the IEEE 39-node system are converted to connect to conventional DC lines, meaning grid nodes 4, 14, 21, and 22 are all DC nodes. The DC lines all adopt constant voltage ratio control on the rectifier side and constant current ratio control on the inverter side. Since the converter stations at both ends of the DC lines absorb reactive power, reactive power compensation is performed on DC node 421. To ensure that the power transmitted by the replaced DC lines is similar to that of the original AC lines, the DC voltage of DC node 14 is controlled at 0.9 (per unit value, the same applies to the DC network parameters below), with a transformation ratio of 0.92; the DC current of DC node 4 is 1.5, with a transformation ratio of 0.94; the DC voltage of DC node 22 is 0.9, with a transformation ratio of 0.9; the DC current of DC node 21 is 3.5, with a transformation ratio of 0.92; and the stage number p of the two DC lines is set to 2.

[0172] right Figure 6 The AC / DC transmission system in this application utilizes the network loss allocation method to obtain the solution of the marginal network loss coefficient model, i.e., the model solution. This solution is then compared with the results obtained using the power flow perturbation method. Figure 7 As shown, the horizontal axis represents the node number of the power grid, and the vertical axis represents the active power coefficient. A comparison reveals that the marginal coefficient values ​​obtained by the two methods are quite similar in terms of sign and magnitude. The opposite signs of the two solutions for nodes 6, 14, and 15 are mainly due to their very small values ​​and calculation errors. The power flow perturbation method first determines an initial operating state, changing the system input, such as the active power injected into the nodes. Then, power flow calculations are performed to obtain specific power flow results, such as AC network losses. Finally, by calculating the ratio of the AC network losses under the new operating state compared to the initial operating state to the increase in active power injected into specific nodes, the approximate marginal coefficient under that initial operating state is obtained. The power flow perturbation method is an effective verification method for the marginal network loss coefficient model.

[0173] Based on expression (3), the network loss is allocated as follows: Figure 8 The results are shown below. The horizontal axis represents the node number in the power grid, and the vertical axis represents the total network loss allocation. It can be seen that the results from the two allocation methods are quite similar.

[0174] The magnitude of the error is represented by calculating the standard deviation of the two sets of data, as shown in the following formula:

[0175]

[0176] In the formula N bus L represents the number of nodes. lamda L0 represents the node-assigned network loss vector obtained by the model solution, and L0 represents the node-assigned network loss vector obtained by the power flow perturbation method. err Let S be the error vector, and let S represent the standard deviation of the two sets of data.

[0177] The final solution yielded S = 0.0039, indicating that the results obtained by both methods are within the error range and meet the needs of actual engineering.

[0178] Table 1. Results of DC network loss allocation based on power flow tracing method

[0179]

[0180] Solving for the line network loss L 14-4 =0.09, L 22-21 =0.245. The allocation results are shown in Table 1. It can be seen that, based on the principle of proportional sharing, if the transmission power of line 4-14 is used entirely by node 4, then all network losses will be allocated. However, if the transmission power of line 21-22 is used by node 21 and its downstream nodes, then the network losses of line 21-22 will be allocated proportionally.

[0181] By summing the AC and DC network losses allocated to each node, the total network loss allocation for each node can be obtained.

[0182] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0183] Based on the same inventive concept, this application also provides a network loss sharing device for AC / DC transmission systems to implement the network loss sharing method for AC / DC transmission systems described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more network loss sharing device embodiments for AC / DC transmission systems provided below can be found in the limitations of the network loss sharing method for AC / DC transmission systems described above, and will not be repeated here.

[0184] In one embodiment, such as Figure 9As shown, a network loss sharing device for an AC / DC transmission system is provided. The AC / DC transmission system includes multiple grid nodes; the multiple grid nodes include pure AC nodes and DC nodes. The device includes: a node parameter acquisition module 910, a DC reactive power module 920, a marginal network loss coefficient module 930, a DC network loss acquisition module 940, and a total network loss sharing module 950, wherein:

[0185] The node parameter acquisition module 910 is used to acquire the AC node parameters of the pure AC node, as well as the first DC node parameters and the second DC node parameters of the DC node.

[0186] The DC reactive power module 920 is used to obtain the third DC node parameter of the DC node based on the first DC node parameter and the second DC node parameter; the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude.

[0187] The marginal network loss coefficient module 930 is used to input AC node parameters, first DC node parameters, and third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation of multiple power grid nodes;

[0188] The DC network loss acquisition module 940 is used to acquire the DC network loss allocation of multiple power grid nodes;

[0189] The total network loss allocation module 950 is used to obtain the total network loss allocation for multiple power grid nodes based on the AC network loss allocation and the DC network loss allocation.

[0190] In one embodiment, the marginal network loss coefficient module includes a marginal coefficient unit and an AC allocation unit.

[0191] The marginal coefficient unit is used to input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the active power marginal coefficient of each grid node; the AC allocation unit is used to obtain the AC network loss allocation amount based on the active power marginal coefficient and the active power of the corresponding grid node.

[0192] In one embodiment, the apparatus further includes a model building module; the model building module is used to, for each pure AC node, take the partial derivative of the active power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node, and take the partial derivative of the reactive power of the pure AC node with respect to the voltage magnitude and phase angle of any grid node.

[0193] In one embodiment, the device further includes a correction unit; the correction unit is used to obtain a correction coefficient, and correct the AC network loss allocation according to the correction coefficient to obtain the corrected AC network loss allocation, and obtain the total network loss allocation of multiple grid nodes according to the corrected AC network loss allocation and the DC network loss allocation.

[0194] In one embodiment, the correction unit includes a coefficient acquisition unit; the coefficient acquisition unit is used to obtain the correction coefficient based on the actual total network loss of the AC network in the AC / DC transmission system, the AC network loss allocation, and the number of grid nodes.

[0195] In one embodiment, the AC node parameters include a first AC voltage amplitude and an AC node phase angle difference; the first DC node parameters include a second AC voltage amplitude and an AC / DC node phase angle difference; the node parameter acquisition module includes a known parameter acquisition unit and an unknown parameter acquisition unit.

[0196] The known parameter acquisition unit is used to acquire the active power and reactive power of each pure AC node, and to acquire the real and imaginary parameters of the branch admittance between the pure AC node and any grid node; the unknown parameter acquisition unit is used to obtain the first AC voltage amplitude, the AC node phase angle difference, the second AC voltage amplitude, and the AC / DC node phase angle difference based on the active power, reactive power, real and imaginary parameters of the branch admittance of the pure AC node.

[0197] In one embodiment, the DC network loss acquisition module includes a preprocessing unit, a power share unit, and a DC allocation unit.

[0198] The preprocessing unit is used to preprocess the DC lines of the AC / DC transmission system to obtain lossless lines; the power share unit is used to obtain the power share of each grid node based on the lossless lines; and the DC allocation unit is used to obtain the DC network loss allocation of multiple grid nodes based on the power share.

[0199] Each module in the aforementioned AC / DC transmission system's network loss sharing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0200] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 10As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for allocating network losses in an AC / DC power transmission system. The display screen can be an LCD screen or an e-ink display screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0201] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0202] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0203] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0204] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0205] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0206] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0207] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for allocating network losses in an AC / DC transmission system, characterized in that, The AC / DC transmission system includes multiple grid nodes; the multiple grid nodes include pure AC nodes and DC nodes; the method includes: Obtain the AC node parameters of the pure AC node, and the first DC node parameters and the second DC node parameters of the DC node; Based on the first DC node parameters and the second DC node parameters, the third DC node parameters are obtained; the third DC node parameters are the partial derivatives of the reactive power of the DC node with respect to the voltage amplitude. The AC node parameters, the first DC node parameters, and the third DC node parameters are input into the marginal network loss coefficient model to obtain the AC network loss allocation of the multiple power grid nodes. Before inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model, the marginal network loss coefficient model is obtained in the following manner: For each pure AC node, the active power of the pure AC node is partially derived with respect to the voltage amplitude and phase angle of any power grid node, and the reactive power of the pure AC node is also partially derived with respect to the voltage amplitude and phase angle of any power grid node. Obtain the DC network loss allocation for the multiple power grid nodes; The total network loss allocation for the multiple power grid nodes is obtained based on the AC network loss allocation and the DC network loss allocation.

2. The method according to claim 1, characterized in that, The step of inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation of the multiple power grid nodes includes: The AC node parameters, the first DC node parameters, and the third DC node parameters are input into the marginal network loss coefficient model to obtain the active power marginal coefficient of each of the power grid nodes. The AC network loss allocation is obtained based on the active power marginal coefficient and the active power of the corresponding grid node.

3. The method according to claim 1 or 2, characterized in that, After inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation of the multiple power grid nodes, the method further includes: Obtain the correction coefficient, and correct the AC network loss allocation amount according to the correction coefficient to obtain the corrected AC network loss allocation amount; Based on the corrected AC network loss allocation and the DC network loss allocation, the total network loss allocation for the multiple power grid nodes is obtained.

4. The method according to claim 3, characterized in that, The process of obtaining the correction coefficient includes: The correction coefficient is obtained based on the actual total network loss of the AC network in the AC / DC transmission system, the AC network loss allocation, and the number of power grid nodes.

5. The method according to claim 1, characterized in that, The AC node parameters include a first AC voltage amplitude and an AC node phase angle difference; the first DC node parameters include a second AC voltage amplitude and an AC / DC node phase angle difference. The process of obtaining the AC node parameters of the pure AC node and the first DC node parameters of the DC node includes: For each pure AC node, obtain the active power and reactive power of the pure AC node, and obtain the real part and imaginary part of the branch admittance between the pure AC node and any grid node. Based on the active power of the pure AC node, the reactive power of the pure AC node, the real part parameter of the branch admittance, and the imaginary part parameter of the branch admittance, the first AC voltage amplitude, the phase angle difference of the AC node, the second AC voltage amplitude, and the phase angle difference between the AC and DC nodes are obtained.

6. The method according to claim 1, characterized in that, The process of obtaining the DC network loss allocation for the multiple power grid nodes includes: The DC lines of the AC / DC transmission system are preprocessed to obtain lossless lines. Based on the lossless line, the power share of each of the power grid nodes is obtained; Based on the power share of each power source, the DC network loss allocation for multiple power grid nodes is obtained.

7. A network loss sharing device for an AC / DC transmission system, characterized in that, The AC / DC transmission system includes multiple grid nodes; the multiple grid nodes include pure AC nodes and DC nodes, and the device includes: The node parameter acquisition module is used to acquire the AC node parameters of the pure AC node, as well as the first DC node parameters and the second DC node parameters of the DC node. A DC reactive power module is used to obtain a third DC node parameter of the DC node based on the first DC node parameter and the second DC node parameter; the third DC node parameter is the partial derivative of the reactive power of the DC node with respect to the voltage amplitude. The marginal network loss coefficient module is used to input the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model to obtain the AC network loss allocation of the multiple power grid nodes. Before inputting the AC node parameters, the first DC node parameters, and the third DC node parameters into the marginal network loss coefficient model, the marginal network loss coefficient model is obtained in the following manner: For each pure AC node, the active power of the pure AC node is partially differentiated with respect to the voltage amplitude and phase angle of any power grid node, and the reactive power of the pure AC node is partially differentiated with respect to the voltage amplitude and phase angle of any power grid node. A DC network loss acquisition module is used to acquire the DC network loss allocation of the multiple power grid nodes; The total network loss allocation module is used to obtain the total network loss allocation of the multiple power grid nodes based on the AC network loss allocation and the DC network loss allocation.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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