Cost allocation method and device for ac-dc hybrid power distribution network based on distribution factor

Abstract

The application provides a cost allocation method and device for an AC-DC hybrid power distribution network based on a distribution factor, which comprises the following steps: constructing an equivalent model of the AC-DC hybrid power distribution network; the equivalent model is used to calculate the transfer impedance of each node of the AC-DC hybrid power distribution network to a branch; based on the equivalent model, the transfer impedance of each node to the branch is calculated, and an augmented distribution factor matrix of the AC-DC hybrid power distribution network is determined; the augmented distribution factor matrix is used to calculate the usage degree of each node of the AC-DC hybrid power distribution network to a line; based on the augmented distribution factor matrix, a cost allocation principle is determined, the cost of the AC-DC hybrid power distribution network is allocated, and an initial cost allocation result is calculated; the cost comprises a fixed cost and a variable cost; based on a generator-load power distribution matrix, the initial cost allocation result is corrected to obtain a cost allocation result. The application can improve the rationality, fairness, applicability and stability of the cost allocation of the AC-DC hybrid power distribution network.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to a method and apparatus for cost allocation in AC / DC hybrid distribution networks based on distribution factors. Background Technology

[0002] In the planning and operation of power distribution networks, how to rationally allocate costs is a critical issue that urgently needs to be addressed. However, with the large-scale integration of distributed photovoltaic power, the structure of medium and low voltage power distribution networks is evolving towards a hybrid AC / DC configuration, posing a serious challenge to traditional methods. First, existing methods are mostly limited to pure AC systems and lack effective adaptation to hybrid AC / DC topologies. Second, traditional methods place too much emphasis on cost sensitivity analysis, often neglecting the overall power balance constraints of the system, resulting in allocation results that do not match the actual generator output and lack physical rationality. Third, traditional methods still have a crude approach to the DC link, often using simplified models such as linear fitting or virtual machines to estimate losses, resulting in poor accuracy. Summary of the Invention

[0003] This invention provides a method and apparatus for cost allocation in AC / DC hybrid distribution networks based on distribution factor, in order to address the shortcomings of existing distribution network cost allocation methods in terms of rationality and applicability.

[0004] This invention provides a cost-sharing method for AC / DC hybrid distribution networks based on distribution factor, comprising: An equivalent model of an AC / DC hybrid distribution network is constructed; the equivalent model is used to calculate the transfer impedance of each node to a branch in the AC / DC hybrid distribution network. Based on the equivalent model, the transfer impedance of each node to the branch is calculated, and the augmented distribution factor matrix of the AC / DC hybrid distribution network is determined; the augmented distribution factor matrix is ​​used to calculate the utilization degree of each node of the AC / DC hybrid distribution network to the line. Based on the augmented distribution factor matrix, the cost allocation principle is determined, and the cost of the AC / DC hybrid distribution network is allocated to calculate the initial cost allocation result; the cost includes fixed cost and variable cost. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result; The cost allocation principles include: The fixed costs are allocated to all nodes of the AC / DC hybrid distribution network using the stamp method. Based on the augmented distribution factor matrix, the utilization level of the lines by each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of the lines by each node.

[0005] In some embodiments, constructing an equivalent model of an AC / DC hybrid distribution network includes: An alternating iterative power flow calculation method is adopted. When calculating the AC power flow of the AC / DC hybrid distribution network, the DC network of the AC / DC hybrid distribution network is equivalent to an AC node connected to the AC bus; when calculating the DC power flow of the AC / DC hybrid distribution network, the AC network of the AC / DC hybrid distribution network is equivalent to a DC node connected to the DC bus. By repeatedly alternating and iterating until the power flow results converge, the equivalent model is obtained. The equivalent model is used to calculate the transfer impedance from the target node to the short-circuit point of the branch based on the voltage of the observed node and the unit injection current of the target node in the AC / DC hybrid distribution network.

[0006] In some embodiments, determining the augmented distribution factor matrix of the AC / DC hybrid distribution network includes: Based on the unit current method and the equivalent model, the sensitivity of the injected power of each AC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the AC transfer distribution factor matrix is ​​obtained. Based on the equivalent model, using the constant power control mode or constant voltage control mode of the voltage source converter (VSC), the sensitivity of the injected power or voltage of each DC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the DC transfer distribution factor matrix is ​​obtained.

[0007] In some embodiments, the DC transfer distribution factor matrix includes a DC load transfer distribution factor matrix and a DC generation transfer distribution factor matrix; The DC network is equivalent to the AC node on the AC network side. m The formula for calculating the DC load transfer distribution factor matrix is ​​as follows: ; in, Indicates DC network dc Load nodes in i When increasing unit power, the power allocated to the generator node j The power; Indicates communication node m When increasing unit power, the power allocated to the generator node j The power; Indicates load node i Injected power for branch b The sensitivity of the power distribution; The formula for calculating the DC power generation transfer distribution factor matrix is ​​as follows: ; in, Indicates DC network dc generator node inj When increasing unit power, the power allocated to the load node i The power; Indicates generator node j When increasing the unit power, it is allocated to the AC node. m The power; Indicates generator node j Injected power for branch b The sensitivity of the power distribution.

[0008] In some embodiments, the step of correcting the initial cost allocation result based on the generator-load power allocation matrix to obtain the cost allocation result includes: Obtain the initial generator-load power allocation matrix; Based on the initial generator-load power allocation matrix, the initial cost allocation result is corrected, and the power generation deviation of each generator node in the AC / DC hybrid distribution network is calculated. The power generation deviation is allocated to each load node of the AC / DC hybrid distribution network, and the load power difference of each load node is calculated. Based on the power generation deviation and the load power difference, the initial generator-load power allocation matrix is ​​updated to obtain the updated generator-load power allocation matrix; Starting with the correction of the initial cost allocation result based on the updated generator-load power allocation matrix, the process is iterated sequentially until the new generator power deviation is less than or equal to a preset deviation threshold, thus determining the final generator-load power allocation matrix. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result.

[0009] In some embodiments, the update formula for the generator-load power allocation matrix is ​​as follows: ; ; ; ; ; in, It is the first k The generator-load power allocation matrix updated after the next iteration; It is the first k The generator-load power allocation matrix updated after -1 iterations represents the generation-load power allocation matrix after the -1st iteration. k Generator node after -1 iteration j Assigned to load nodesi The power; Indicates the first k Generator node after -1 iteration j The deviation in power generation; Indicates generator node j When increasing unit power, the power allocated to the load node i The power; Indicates the first k Load node after -1 iteration i The difference in load power; Indicates load node i When increasing unit power, the power allocated to the generator node j The power; Indicates generator node j The actual power generation capacity; Indicates the first k Generator node after -1 iteration j Total power generation; N For the set of all load nodes, M This is the set of all generator nodes; Represents a communication network ac Medium generator node j When increasing unit power, the power allocated to the load node i The power; This is the preset deviation threshold.

[0010] In some embodiments, the cost allocation of the AC / DC hybrid distribution network includes: Calculate the line utilization level of each load node in the AC / DC hybrid distribution network at the full load level; Calculate the carbon emission cost increment of the AC / DC hybrid distribution network based on the grid loss increment caused by photovoltaic grid connection; Based on the full-load level of line usage, the incremental carbon emission cost is allocated to the relevant nodes of the AC / DC hybrid distribution network.

[0011] The present invention also provides a cost-sharing device for AC / DC hybrid distribution networks based on distribution factor, comprising: A construction unit is used to construct an equivalent model of an AC / DC hybrid distribution network; the equivalent model is used to calculate the transfer impedance of each node of the AC / DC hybrid distribution network to the branch. The determining unit is used to calculate the transfer impedance of each node to the branch based on the equivalent model, and to determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; the augmented distribution factor matrix is ​​used to calculate the utilization degree of each node to the line in the AC / DC hybrid distribution network. The cost allocation unit is used to determine the cost allocation principle based on the augmented distribution factor matrix, allocate the cost of the AC / DC hybrid distribution network, and calculate the initial cost allocation result; the cost includes fixed cost and variable cost; The correction unit is used to correct the initial cost allocation result based on the generator-load power allocation matrix to obtain the cost allocation result; The cost allocation principles include: The fixed costs are allocated to all nodes of the AC / DC hybrid distribution network using the stamp method. Based on the augmented distribution factor matrix, the utilization level of the lines by each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of the lines by each node.

[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the cost allocation method for AC / DC hybrid distribution networks based on distribution factors as described above.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the AC / DC hybrid distribution network cost allocation method based on the distribution factor as described above.

[0014] This invention provides a cost allocation method and apparatus for AC / DC hybrid distribution networks based on distribution factors. The method involves constructing an equivalent model of the AC / DC hybrid distribution network; calculating the transfer impedance of each node to its branches based on the equivalent model to determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; determining the cost allocation principle based on the augmented distribution factor matrix and allocating the cost of the AC / DC hybrid distribution network accordingly, calculating the initial cost allocation result; and correcting the initial cost allocation result based on the generator-load power distribution matrix to obtain the final cost allocation result. This method improves the rationality, fairness, applicability, and stability of cost allocation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating the cost allocation method for AC / DC hybrid distribution networks based on distribution factor provided in this embodiment of the invention.

[0017] Figure 2 This is a schematic diagram of the AC / DC hybrid distribution network provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the AC / DC hybrid distribution network cost sharing device based on the distribution factor provided in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Figure 1 This is a flowchart illustrating the cost-sharing method for AC / DC hybrid distribution networks based on distribution factor provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes: Step 110: Construct an equivalent model of the AC / DC hybrid distribution network; the equivalent model is used to calculate the transfer impedance of each node to the branch in the AC / DC hybrid distribution network.

[0022] Optionally, the AC / DC hybrid distribution network includes an AC network and a DC network; the AC network includes multiple AC nodes, such as AC generator nodes and AC load nodes; the DC network includes multiple DC nodes, such as DC generator nodes and DC load nodes.

[0023] Optionally, the AC / DC hybrid distribution network includes at least multiple generator nodes and multiple load nodes.

[0024] Optionally, the AC network and the DC network can be made equivalent to each other by alternating iterative methods until the power flow results converge, thus obtaining a unified equivalent model, which can lay a unified modeling foundation for the subsequent calculation of the distribution factor.

[0025] Step 120: Based on the equivalent model, calculate the transfer impedance of each node to the branch and determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; the augmented distribution factor matrix is ​​used to calculate the degree of line utilization of each node in the AC / DC hybrid distribution network.

[0026] Optionally, the distribution factor method can be used to reflect the flexible and varied characteristics of the distribution network topology through the electrical distance between nodes. Since loads absorb the output power of generators with shorter electrical distances, the equivalent impedance from short-circuit calculations is typically used to represent the electrical distance. The equivalent impedance is the transfer impedance.

[0027] Step 130: Based on the augmented distribution factor matrix, determine the cost allocation principle, allocate the cost of the AC / DC hybrid distribution network, and calculate the initial cost allocation result; the cost includes fixed cost and variable cost.

[0028] The cost allocation principles include: The stamp method is used to distribute fixed costs across all nodes of the AC / DC hybrid distribution network; Based on the augmented distribution factor matrix, the utilization level of each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of each node.

[0029] Optionally, the apportionment principle also includes: (1) In a hybrid AC / DC distribution network, since the DC voltage is relatively stable compared to the AC voltage, the voltage of the DC part can be considered to remain basically unchanged.

[0030] (2) This method assumes that power flow changes are mainly caused by changes in load and distributed photovoltaic (PV) power. Therefore, it follows the principle of "whoever benefits, is responsible." The power flow-related costs (variable cost increments) of the line are allocated to all PV nodes, while the power flow-independent costs (fixed cost increments) are allocated to all nodes using the postage stamp method. It is particularly emphasized that the variable cost allocation in this embodiment of the invention is based on the incremental cost of grid loss caused before and after PV grid connection.

[0031] (3) When photovoltaic nodes For the line When the full-load level of the line utilization is negative, it means that increasing photovoltaic power generation at that node can reduce the line's utilization rate. The losses incurred by photovoltaic nodes increase the economic viability of retrofitting and shorten the cost recovery period, therefore the costs should not be amortized. For the line When the full-load level of the line is positive, it means that the photovoltaic power generation at that node has increased, resulting in bidirectional power flow on the line and increased line loss. Therefore, the line loss cost should be shared.

[0032] Step 140: Based on the generator-load power allocation matrix, correct the initial cost allocation result to obtain the cost allocation result; It should be noted that traditional allocation methods often fail to guarantee power balance. Therefore, a power balance correction mechanism is introduced. By establishing a generator-load power allocation matrix and using an iterative correction method, the deviation between the allocation result and the actual output can be effectively eliminated, thereby ensuring the overall power balance and physical rationality of the system.

[0033] If there is a certain deviation between the actual power generation on the power generation side and the calculation results of the AC / DC hybrid distribution network cost allocation method based on the distribution factor method, the power difference can be corrected by using an alternating iterative method.

[0034] For AC / DC hybrid distribution networks, to reduce computational complexity, the DC system can be treated as a PQ node. m The power allocation results are corrected to achieve power balance in the generator output allocation.

[0035] Optionally, the distribution factor matrix of the DC load can be further added to the modified model.

[0036] In some embodiments, constructing an equivalent model of an AC / DC hybrid distribution network includes: An alternating iterative power flow calculation method is adopted. When calculating the AC power flow of the AC-DC hybrid distribution network, the DC network of the AC-DC hybrid distribution network is equivalent to an AC node connected to the AC bus. When calculating the DC power flow of the AC-DC hybrid distribution network, the AC network of the AC-DC hybrid distribution network is equivalent to a DC node connected to the DC bus. By repeatedly alternating and iterating until the power flow results converge, an equivalent model is obtained. The equivalent model is used to calculate the transfer impedance from the target node to the short-circuit point of the branch based on the voltage of the observed node and the unit injection current of the target node in the AC-DC hybrid distribution network.

[0037] Alternatively, the formula for calculating the transfer impedance is as follows: ; in, This represents the total number of generator nodes. This represents the total number of load nodes. branch road The transfer impedance.

[0038] By defining the transfer distribution factor matrix, the utilization level of the line by each load node and / or generator node can be calculated. Therefore, the key lies in how to determine the transfer impedance of the AC / DC hybrid distribution network.

[0039] ; ; In the formula, Indicates when the load node When increasing unit power, it is allocated to the generator node. The power; Indicates when the generator node When increasing unit power, it is allocated to load nodes. The power.

[0040] The transfer impedance is typically determined using the unit current method. This involves grounding the potentials of each generator and setting the current of the branch furthest from the short-circuit point as a unit current, then calculating the power flow values ​​for each branch in the system. However, in AC / DC hybrid distribution networks, the presence of a DC network makes this calculation impossible. Therefore, an equivalent approach using alternating iteration is employed. This involves treating the DC network as an equivalent AC node when calculating the power flow values ​​for the AC network, and vice versa, until the power flow results for the AC / DC hybrid distribution network meet the convergence accuracy requirements and the iteration exits.

[0041] Figure 2 This is a schematic diagram of the AC / DC hybrid distribution network provided in an embodiment of the present invention. Figure 2 As shown, Bus.1AC and Bus.2AC represent AC bus 1 and AC bus 2, respectively; VSC1 and VSC2 represent voltage source converter 1 and voltage source converter 2, respectively; G1 and G2 represent generator node 1 and generator node 2, respectively; DC represents the DC network. according to Figure 2 Observation point The voltage can be calculated, and the current of each power source is a unit current. The transfer impedance from each power source to the short-circuit point can then be obtained. The calculation formula is as follows: ; During each alternating iteration, the power flow values ​​on the AC side of the two converters will change. Therefore, it will also change the equivalent transfer impedance of the AC / DC hybrid distribution network. After iteration, the calculation formula for the transfer impedance is as follows: ; In the formula, t Indicates the number of iterations. Indicates the iteration number t The next node To the short circuit point The transfer impedance, Indicates the iteration number t Second Point voltage.

[0042] This completes the calculation of the equivalent impedance matrix of the AC / DC hybrid distribution network, allowing us to determine the line utilization level of each load node. To simplify the calculation, a method for calculating the DC branch power flow sensitivity considering VSC control is introduced. Due to the linear characteristics of the DC network, based on the principle of linear network superposition, the DC grid branch power flow can be decomposed into the superposition of contributions from constant voltage control and constant power control. This allows us to derive the sensitivity of DC node injected power and voltage to branch power flow. When the DC node load changes, the power flow values ​​on both sides of the converter can be directly calculated, enabling us to calculate the power allocated to the AC generator node per unit increment of DC load.

[0043] In some embodiments, determining the augmented distribution factor matrix of the AC / DC hybrid distribution network includes: Based on the unit current method and equivalent model, the sensitivity of the injected power of each AC node in the AC-DC hybrid distribution network to the branch power distribution is calculated, and the AC transfer distribution factor matrix is ​​obtained. Based on the equivalent model, using the constant power control mode or constant voltage control mode of the voltage source converter (VSC), the sensitivity of the injected power or voltage of each DC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the DC transfer distribution factor matrix is ​​obtained.

[0044] It should be noted that in the embodiments of the present invention, not only are the unit current method and the principle of transfer impedance combined to characterize the sensitivity of nodes to branch power distribution, but also the differences between voltage source converters in constant power control and constant voltage control modes are fully considered to form an augmented distribution factor matrix that can reflect the characteristics of AC and DC interaction.

[0045] The control modes are mainly divided into constant power control and constant voltage control. In constant power control mode, the active power on the AC side is known, and the power on the DC side is obtained after VSC transformation. Since VSC has nonlinear steady-state characteristics, it is particularly important to linearize the input power of the AC bus as a known value. However, based on the classic AC / DC hybrid distribution network power flow calculation method, obtaining the input power of the DC bus is an important basis for DC line power flow calculation. Therefore, the input power of the DC bus can be obtained in advance through power flow calculation, which is the known value of this model. Furthermore, the calculation formula for the distribution factor of the DC bus input power with respect to the active power of all DC branches can be derived.

[0046] Optionally, the nodes in the DC network The input power is defined as the power relative to the node. The sum of the power of all adjacent branches is calculated using the following formula: ; In the formula, For nodes Input power; For nodes The set of all connected nodes; branch road The electrical conductivity value; , They are nodes , The voltage.

[0047] Further detailed analysis of the above formula yields the following calculation formula: ; In the formula, Represents a node The self-admittance; some terms in the above formula are only related to the voltage amplitude of the node itself, while some terms are related to the voltage amplitude of the adjacent node.

[0048] DC line branch branch road The power is: ; In the formula, express , Branch paths between two nodes; Represents a node , The power of the DC branch between them.

[0049] right The partial derivative is calculated using the following formula: ; ; In the formula, Represents a node , DC branch power between; Represents the power pairs of all branches in a DC network. The partial derivatives, i.e., the node voltages Distribution factor of power for all branches.

[0050] However, the value on the right side of the above equation has not yet been obtained and requires further processing. The distribution factor of the node input power with respect to the power of any branch is calculated using the following formula: ; When node When the voltage is constant, the branch power relative to the node can be obtained. The partial derivative of the voltage; at this node When constant power control is used, the branch power relative to the node can be obtained. Partial derivative of input power.

[0051] When the DC grid is in normal operating condition, regardless of the nodes Regardless of the control method, the voltage amplitudes of all nodes in the distribution network are very similar, so it can be assumed that the voltage of each node is the rated voltage.

[0052] ; In the formula, nodes , With nodes All directly adjacent nodes The partial derivatives of voltage are all unknowns. Except for the nodes. The input power of the remaining nodes using constant power control will not change with... And the change, therefore the input power of this part of the node affects the node The partial derivative of the voltage is 0.

[0053] ; In the formula, This refers to nodes Directly adjacent nodes; Represents a node The power.

[0054] If we assume that all node voltages are rated voltages, the above equation can be further simplified to: ; In conclusion, Each undetermined quantity corresponds to By solving these equations, all the unknowns can be obtained. Therefore, the linearity of branch power variation can be represented by the input power of the constant power control node.

[0055] In constant voltage control mode, it is assumed that the voltage of all nodes in the distribution network is at the rated voltage. Nearby can be further simplified to: ; The key problem to be solved here is how to determine the minute increment of the voltage at the constant power control node caused by the voltage change at the constant voltage control node. Since the input power of the constant power control node does not change with the voltage change at the constant voltage node, it can be further simplified to: ; For constant voltage control nodes A set of equations is obtained for any constant power control node, and then the equations for the node can be derived. After the voltage of a branch changes, the voltage change of any other constant-power control node is represented by the voltage change of the control node.

[0056] Since the system includes both AC loads and generation units, as well as DC loads and DC power sources, the impact mechanisms of different types of nodes on line power flow differ. Therefore, it is necessary to construct transfer distribution factor matrices for the AC and DC sides separately. This not only reflects the sensitivity relationship between the two types of nodes within a unified framework, but also provides a quantitative basis for subsequent cost allocation calculations.

[0057] Optionally, define the AC load transfer distribution factor matrix. AC power generation transfer distribution factor matrix Specifically, it is expressed as: ; ; In the formula: Indicates when AC load node When increasing unit power, it is allocated to the generator node. The power; Indicates when the alternator node When increasing unit power, it is allocated to load nodes. The power.

[0058] In some embodiments, the DC transfer distribution factor matrix includes the DC load transfer distribution factor matrix and the DC generation transfer factor matrix; The DC network is equivalent to the AC node on the AC network side. m The formula for calculating the DC load transfer distribution factor matrix is ​​as follows: ; in, Indicates DC network dc Load nodes in i When increasing unit power, the power allocated to the generator node j The power; Indicates communication node m When increasing unit power, the power allocated to the generator node j The power; Indicates load node i Injected power for branch b The sensitivity of the power distribution; The formula for calculating the DC power generation transfer distribution factor matrix is ​​as follows: ; in, Indicates DC networkdc generator node in j When increasing unit power, the power allocated to the load node i The power; Indicates generator node j When increasing the unit power, it is allocated to the AC node. m The power; Indicates generator node j Injected power for branch b The sensitivity of the power distribution.

[0059] Optionally, taking a constant power control node as an example, it is a response DC load node. The degree of change in branch power flow caused by the increment, equating the DC system to an increasing... PQ node compute nodes The generalized AC network distribution factor, considering the DC distribution factor under control mode. , obtain node The DC load transfer distribution factor for the entire AC / DC hybrid distribution network.

[0060] In some embodiments, the initial cost allocation result is corrected based on the generator-load power allocation matrix to obtain the cost allocation result, including: Obtain the initial generator-load power allocation matrix; Based on the initial generator-load power allocation matrix, the initial cost allocation results are corrected, and the power generation deviation of each generator node in the AC / DC hybrid distribution network is calculated. The power generation deviation is distributed to each load node of the AC / DC hybrid distribution network, and the load power difference of each load node is calculated. Based on the power generation deviation and load power difference, the initial generator-load power allocation matrix is ​​updated to obtain the updated generator-load power allocation matrix; Starting with correcting the initial cost allocation result based on the updated generator-load power allocation matrix, the process iterates sequentially until the new generator power deviation is less than or equal to a preset deviation threshold, thus determining the final generator-load power allocation matrix. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result.

[0061] In some embodiments, the update formula for the generator-load power allocation matrix is ​​as follows: ; ; ; ; ; in, It is the first k The generator-load power allocation matrix updated after the next iteration; It is the first k The generator-load power allocation matrix updated after -1 iterations represents the generation-load power allocation matrix after the -1st iteration. k Generator node after -1 iteration j Assigned to load nodes i The power; Indicates the first k Generator node after -1 iteration j The deviation in power generation; Indicates generator node j When increasing unit power, the power allocated to the load node i The power; Indicates the first k Load node after -1 iteration i The difference in load power; Indicates load node i When increasing unit power, the power allocated to the generator node j The power; Indicates generator node j The actual power generation capacity; Indicates the first k Generator node after -1 iteration j Total power generation; N For the set of all load nodes, M This is the set of all generator nodes; Represents a communication network ac Medium generator node j When increasing unit power, the power allocated to the load node i The power; This is the preset deviation threshold.

[0062] Optionally, if the generator-load power distribution matrix is After the first The elements of the matrix after the next iteration are shown below: ; ; In the formula: Indicates the first After the next iteration, the generator node The emitted power is distributed to the nodes. The power value at that location; Represents a node The load size at the location.

[0063] In some embodiments, the cost allocation of a hybrid AC / DC distribution network includes: Calculate the line utilization level at the full load level of each load node in the AC / DC hybrid distribution network; Calculate the increase in carbon emission costs of AC / DC hybrid distribution networks based on the increase in grid loss caused by photovoltaic grid connection; Based on the utilization level of lines at full load, the incremental carbon emission costs will be allocated to the relevant nodes of the AC / DC hybrid distribution network.

[0064] To make the method more universal and environmentally friendly, this invention further establishes an allocation model that considers full load levels and carbon emission flows. On the one hand, the line utilization is calculated under different load levels to ensure that the cost allocation results can reflect the maximum load, minimum load, and typical operating conditions; on the other hand, the incremental grid loss and carbon emission brought about by photovoltaic grid connection are reasonably allocated to relevant nodes, so that the allocation mechanism can take into account both economic and environmental benefits.

[0065] (1) Calculation method for the utilization level of full-load horizontal lines: At different load levels, the change in power flow across the entire line varies depending on the unit increase in load power. Therefore, a fixed allocation matrix cannot be used to distribute the incremental cost. Calculating the line utilization at full load levels is more in line with actual usage scenarios.

[0066] First, calculate the new generator output after adding a unit incremental power to the load node. Then, using the generator-load power distribution matrix, determine the distribution of this unit load among the generator nodes, thereby obtaining the new generator output and load values.

[0067] Secondly, calculate the change in line power caused by this unit load. This applies to a specific line in the distribution network. Find the line load after adding a unit increment of power to all load nodes. The increase in the flow of the upstream trend Calculate load nodes For the line The degree of unit usage.

[0068] Finally, calculate the load nodes. For the line The full-load level line utilization is determined. The load values ​​of the remaining load nodes are set as constants, and the calculations are performed at each load level, i.e., at each node. The load at each node gradually increases from 0 to a typical value. The unit utilization of the line is then summed sequentially to obtain the full load level of the line utilization at that node. Load Node For the line The formula for calculating the utilization level of a full-load horizontal line is as follows: ; In the formula: Indicates load node For the line The degree of full-load level line usage, Represents a node The load value.

[0069] (2) Cost allocation method: First, compute nodes Shared route Trend-related costs, i.e., variable cost increments.

[0070] For both the generation and load sides, assuming that changes in line losses are primarily caused by distributed photovoltaic (PV) systems, therefore, for each PV grid-connected node, the following applies to the line... The relative usage ratio of the line Cost The calculation formula is as follows: ; In the formula: Indicates the line The variable cost increment; Indicates load node The allocated variable cost increment; This represents all photovoltaic user nodes.

[0071] Secondly, compute nodes Shared route The trend is independent of cost, that is, the increase in fixed cost.

[0072] For costs unrelated to trends, i.e., the annual increase in fixed costs, they are allocated to all users using the postage stamp method, i.e.: ; In the formula: Indicates the line The incremental fixed costs; Indicates load node The allocated increase in fixed costs; Represents a node Peak load; This represents all user nodes.

[0073] Finally, a case study of a 10kV distribution network verifies the effectiveness of the method proposed in this embodiment. The results show that this method can reasonably reflect the line usage of each node under various power flow and network topology conditions, with fair and reasonable allocation results, demonstrating good engineering application value.

[0074] A multi-terminal flexible DC system upgrade scheme is adopted, namely, DC1 is configured between Bus.5 and Bus.10, and DC2 is configured between Bus.16 and Bus.17. The capacity of the converter stations is configured at 1.2 times the DC load capacity, and the loss coefficients a, b, and c of the VSCs are 0.001, 0.004, and 0.008, respectively. VSC1 and VSC3 are controlled by constant power, and VSC2 and VSC4 are controlled by constant voltage. The DC loads of the DC1 and DC2 DC networks are [6, 8, 20, 10] kW and [10, 13, 16, 14] kW, respectively. The basic scenario is set as connecting 100kW distributed photovoltaic power at 4 nodes in the AC / DC hybrid distribution network after the multi-terminal flexible DC system upgrade. According to the principle of allocating variable cost increments to the photovoltaic side and fixed cost increments to the load side and photovoltaic side, the total cost of the Bus.5-Bus.10 line allocated to each node is calculated.

[0075] (1) Calculate the load Full load level line utilization: Taking node 18 as an example, assuming a power increment of 1kW is connected at DC node 18: After power difference correction, the equivalent PQ node of the DC system The AC load transfer distribution factor matrix is ​​shown in Table 1.

[0076] Table 1 is the AC load transfer distribution factor matrix provided in the embodiments of the present invention.

[0077] Table 1 AC load transfer distribution factor matrix

[0078] Considering the VSC control method, which is the superposition of the contributions of constant power control and constant voltage control to the branch power, the DC load transfer distribution factor matrix is ​​shown in Table 2. Table 2 is the DC load transfer distribution factor matrix provided by the embodiment of the present invention.

[0079] Table 2 DC load transfer distribution factor matrix

[0080] By using the generator-load power distribution matrix, the distribution of the unit load among the generator nodes can be obtained, thereby deriving the new power output and load values.

[0081] The changes in DC branch power flow caused by a unit increase in DC load are shown in Table 3; the changes in AC branch power flow caused by a unit increase in DC load are shown in Table 4. Table 3 shows the changes in DC branch power flow caused by a unit increase in DC load according to the embodiments of the present invention.

[0082] Table 3. DC branch power flow changes caused by a unit increase in DC load.

[0083] Table 4 shows the AC branch power flow changes caused by a unit increase in DC load according to the embodiments of the present invention.

[0084] Table 4. Changes in AC branch power flow caused by a unit increase in DC load.

[0085] Then, calculate the flow through a certain line when all load nodes are added with a unit increment. The power flow variation. Based on this, the load nodes are determined. For the line The full-load level line utilization is determined. The load values ​​of the remaining load nodes are set as constants, and the calculations are performed at each load level, i.e., at each node. The load at each node gradually increases from 0 to a typical value. The unit utilization of the line is then summed sequentially to obtain the full load level of the line utilization at that node. This is illustrated using AC lines Bus.5-Bus.10 as an example.

[0086] (2) Calculate the annual variable cost increment of Bus.5-Bus.10 that should be allocated to each node: It is known that upgrading the AC distribution network with a multi-terminal flexible DC system on the bus section yields the highest photovoltaic (PV) absorption rate. Assuming a new 100kW PV unit is connected at node 4, increasing the PV grid-connected capacity of node 4 from 50kW to 150kW, the losses in AC branch lines Bus.5-Bus.10 increase from 4.048kW to 5.25kW, resulting in an annual variable cost increase of 4211.8 yuan. The power flow-related costs are allocated based on the relative usage of AC lines Bus.5-Bus.10 by each PV grid-connected node, as shown in Table 5. Table 5 shows the annual variable cost increase of lines Bus.5-Bus.10 allocated to PV nodes according to the embodiments of the present invention.

[0087] Table 5 Annual Variable Cost Increment of Photovoltaic Node-Shared Lines Bus.5-Bus.10

[0088] Since the connection of 100kW photovoltaic power at node 4 generates bidirectional power flow to lines Bus.5-Bus.10, resulting in increased line losses, this increase in variable costs should be allocated to all photovoltaic nodes. However, under the limitation of the penetration rate corresponding to the critical point that causes the increase or decrease in network losses, the network losses after photovoltaic grid connection show a trend of first decreasing and then increasing. If the grid connection of photovoltaic power reduces the line losses and the increase in variable costs is negative, then it is considered that all the benefits are obtained by the power supply company.

[0089] (3) Calculate the annual fixed cost increment of Bus.5-Bus.10 that should be allocated to each node: After upgrading the AC distribution network with a multi-terminal flexible DC system on the bus section, a DC line was added between Bus.5 and Bus.10. The fixed cost accounting items include the total life-cycle cost of equipment such as VSC1, VSC2, and DC conductors, totaling 960,000 yuan. The investment payback period is 10.98 years, and the annual fixed cost increment calculated using the annualized rate method is 96,200 yuan. In this scenario, for costs unrelated to power flow, i.e., the annual fixed cost increment, it is allocated to all users using the postage stamp method, as shown in Tables 6 and 7. Table 6 shows the annual fixed cost increment of Bus.5-Bus.10 allocated at the AC node according to this embodiment of the invention.

[0090] Table 6 Annual Fixed Cost Increment of AC Node-Shared Lines Bus.5-Bus.10

[0091] Table 7 shows the annual fixed cost increments for DC node-shared lines Bus.5-Bus.10 provided in the embodiments of the present invention.

[0092] Table 7 Annual Fixed Cost Increment of DC Node-Amortized Lines Bus.5-Bus.10

[0093] (4) Calculate the annual carbon flow cost increment of Bus.5-Bus.10 that should be allocated to each node: Based on the annual variable cost increment of Bus.5-Bus.10 to be allocated to each node, the increase in grid loss cost caused by photovoltaic grid connection is entirely allocated to the photovoltaic side. Therefore, the increase in carbon flow cost should also be entirely allocated to the photovoltaic side, as shown in Table 8. The carbon emission per unit of electricity is taken as 0.785 tons / MWh, and the carbon trading price is taken as 50 yuan / ton. Table 8 shows the annual carbon flow cost increment of Bus.5-Bus.10 to be allocated to photovoltaic nodes according to the embodiments of the present invention.

[0094] Table 8. Annual carbon flow cost increment to be shared by photovoltaic nodes for Bus.5-Bus.10 lines.

[0095] The results of the example show that the cost-sharing model for AC / DC hybrid distribution networks based on the distribution factor method can adapt well to the characteristics of power flow and network topology changes in distribution networks, and fully reflect the degree of line utilization by load nodes.

[0096] The cost-sharing device for AC / DC hybrid distribution networks based on distribution factors provided by the present invention will be described below. The cost-sharing device for AC / DC hybrid distribution networks based on distribution factors described below can be referred to in correspondence with the cost-sharing method for AC / DC hybrid distribution networks based on distribution factors described above.

[0097] Figure 3 This is a schematic diagram of the structure of the AC / DC hybrid distribution network cost-sharing device based on the distribution factor provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the AC / DC hybrid distribution network cost-sharing device 300 based on distribution factor includes: Building unit 310 is used to build an equivalent model of the AC / DC hybrid distribution network; the equivalent model is used to calculate the transfer impedance of each node to the branch in the AC / DC hybrid distribution network. Unit 320 is used to calculate the transfer impedance of each node to the branch based on the equivalent model, and to determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; the augmented distribution factor matrix is ​​used to calculate the utilization degree of each node to the line in the AC / DC hybrid distribution network. Cost allocation unit 330 is used to determine the cost allocation principle based on the augmented distribution factor matrix, allocate the cost of the AC / DC hybrid distribution network, and calculate the initial cost allocation result; the cost includes fixed cost and variable cost; The correction unit 340 is used to correct the initial cost allocation result based on the generator-load power allocation matrix to obtain the cost allocation result; The cost allocation principles include: The stamp method is used to distribute fixed costs across all nodes of the AC / DC hybrid distribution network; Based on the augmented distribution factor matrix, the utilization level of each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of each node.

[0098] Optionally, an equivalent model of an AC / DC hybrid distribution network is constructed, including: An alternating iterative power flow calculation method is adopted. When calculating the AC power flow of the AC-DC hybrid distribution network, the DC network of the AC-DC hybrid distribution network is equivalent to an AC node connected to the AC bus. When calculating the DC power flow of the AC-DC hybrid distribution network, the AC network of the AC-DC hybrid distribution network is equivalent to a DC node connected to the DC bus. By repeatedly alternating and iterating until the power flow results converge, an equivalent model is obtained. The equivalent model is used to calculate the transfer impedance from the target node to the short-circuit point of the branch based on the voltage of the observed node and the unit injection current of the target node in the AC-DC hybrid distribution network.

[0099] Optionally, the augmented distribution factor matrix of the AC / DC hybrid distribution network is determined, including: Based on the unit current method and equivalent model, the sensitivity of the injected power of each AC node in the AC-DC hybrid distribution network to the branch power distribution is calculated, and the AC transfer distribution factor matrix is ​​obtained. Based on the equivalent model, using the constant power control mode or constant voltage control mode of the voltage source converter (VSC), the sensitivity of the injected power or voltage of each DC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the DC transfer distribution factor matrix is ​​obtained.

[0100] Optionally, the DC transfer distribution factor matrix includes the DC load transfer distribution factor matrix and the DC generation transfer distribution factor matrix; The DC network is equivalent to the AC node on the AC network side. m The formula for calculating the DC load transfer distribution factor matrix is ​​as follows: ; in, Indicates DC network dc Load nodes in i When increasing unit power, the power allocated to the generator node j The power; Indicates communication node m When increasing unit power, the power allocated to the generator node j The power; Indicates load node i Injected power for branch b The sensitivity of the power distribution; The formula for calculating the DC power generation transfer distribution factor matrix is ​​as follows: ; in, Indicates DC network dc generator node in j When increasing unit power, the power allocated to the load node i The power; Indicates generator node j When increasing the unit power, it is allocated to the AC node. m The power; Indicates generator node j Injected power for branch b The sensitivity of the power distribution.

[0101] Optionally, based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the cost allocation result, including: Obtain the initial generator-load power allocation matrix; Based on the initial generator-load power allocation matrix, the initial cost allocation results are corrected, and the power generation deviation of each generator node in the AC / DC hybrid distribution network is calculated. The power generation deviation is distributed to each load node of the AC / DC hybrid distribution network, and the load power difference of each load node is calculated. Based on the power generation deviation and load power difference, the initial generator-load power allocation matrix is ​​updated to obtain the updated generator-load power allocation matrix; Starting with correcting the initial cost allocation result based on the updated generator-load power allocation matrix, the process iterates sequentially until the new generator power deviation is less than or equal to a preset deviation threshold, thus determining the final generator-load power allocation matrix. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result.

[0102] Optionally, the update formula for the generator-load power distribution matrix is ​​as follows: ; ; ; ; ; in, It is the first k The generator-load power allocation matrix updated after the next iteration; It is the first k The generator-load power allocation matrix updated after -1 iterations represents the generation-load power allocation matrix after the -1st iteration. k Generator node after -1 iteration j Assigned to load nodes i The power; Indicates the first k Generator node after -1 iteration j The deviation in power generation; Indicates generator node j When increasing unit power, the power allocated to the load node i The power; Indicates the first k Load node after -1 iteration i The difference in load power; Indicates load node i When increasing unit power, the power allocated to the generator node j The power; Indicates generator node j The actual power generation capacity; Indicates the firstk Generator node after -1 iteration j Total power generation; N For the set of all load nodes, M This is the set of all generator nodes; Represents a communication network ac Medium generator node j When increasing unit power, the power allocated to the load node i The power; This is the preset deviation threshold.

[0103] Optionally, the cost of the AC / DC hybrid distribution network is allocated, including: Calculate the line utilization level at the full load level of each load node in the AC / DC hybrid distribution network; Calculate the increase in carbon emission costs of AC / DC hybrid distribution networks based on the increase in grid loss caused by photovoltaic grid connection; Based on the utilization level of lines at full load, the incremental carbon emission costs will be allocated to the relevant nodes of the AC / DC hybrid distribution network.

[0104] Figure 4 A schematic diagram of the structure of the electronic device provided in the embodiments of the present invention is shown below. Figure 4 As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communications bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other through the communications bus 440. Processor 410 can call logic instructions in memory 430 to execute a cost allocation method for AC / DC hybrid distribution networks based on distribution factors. This method includes: constructing an equivalent model of the AC / DC hybrid distribution network; using the equivalent model to calculate the transfer impedance of each node to a branch in the AC / DC hybrid distribution network; calculating the transfer impedance of each node to a branch based on the equivalent model to determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; using the augmented distribution factor matrix to calculate the utilization level of each node to the line in the AC / DC hybrid distribution network; determining the cost allocation principle based on the augmented distribution factor matrix, allocating the cost of the AC / DC hybrid distribution network, and calculating the initial cost allocation result; the cost includes fixed costs and variable costs; and correcting the initial cost allocation result based on the generator-load power allocation matrix to obtain the final cost allocation result. The cost allocation principle includes: using the stamp method to allocate fixed costs to all nodes of the AC / DC hybrid distribution network; calculating the utilization level of each node to the line in the AC / DC hybrid distribution network based on the augmented distribution factor matrix; and allocating variable costs to each node based on the utilization level of each node to the line.

[0105] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a 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 includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. 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.

[0106] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the cost allocation method for AC / DC hybrid distribution networks based on distribution factors provided by the methods described above. This method includes: constructing an equivalent model of the AC / DC hybrid distribution network; using the equivalent model to calculate the transfer impedance of each node to a branch in the AC / DC hybrid distribution network; calculating the transfer impedance of each node to a branch based on the equivalent model, and determining the augmented distribution factor matrix of the AC / DC hybrid distribution network; and using the augmented distribution factor matrix to calculate the transfer impedance of each node to a line in the AC / DC hybrid distribution network. The initial cost allocation result is calculated based on the utilization level of the AC / DC hybrid distribution network, determined according to the augmented distribution factor matrix, and the cost allocation principle is determined. The cost includes fixed cost and variable cost. The initial cost allocation result is corrected based on the generator-load power allocation matrix to obtain the final cost allocation result. The cost allocation principle includes: using the stamp method to allocate fixed costs to all nodes of the AC / DC hybrid distribution network; calculating the utilization level of the lines by each node of the AC / DC hybrid distribution network based on the augmented distribution factor matrix, and allocating variable costs to each node based on the utilization level of the lines by each node.

[0107] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0108] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cost-sharing method for AC / DC hybrid distribution networks based on distribution factor, characterized in that, include: Construct an equivalent model of an AC / DC hybrid distribution network; The equivalent model is used to calculate the transfer impedance of each node to the branch in the AC / DC hybrid distribution network. Based on the equivalent model, the transfer impedance of each node to the branch is calculated, and the augmented distribution factor matrix of the AC / DC hybrid distribution network is determined; the augmented distribution factor matrix is ​​used to calculate the utilization degree of each node of the AC / DC hybrid distribution network to the line. Based on the augmented distribution factor matrix, the cost allocation principle is determined, and the cost of the AC / DC hybrid distribution network is allocated to calculate the initial cost allocation result; the cost includes fixed cost and variable cost. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result; The cost allocation principles include: The fixed costs are allocated to all nodes of the AC / DC hybrid distribution network using the stamp method. Based on the augmented distribution factor matrix, the utilization level of the lines by each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of the lines by each node.

2. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 1, characterized in that, The equivalent model for constructing the AC / DC hybrid distribution network includes: An alternating iterative power flow calculation method is adopted. When calculating the AC power flow of the AC / DC hybrid distribution network, the DC network of the AC / DC hybrid distribution network is equivalent to an AC node connected to the AC bus; when calculating the DC power flow of the AC / DC hybrid distribution network, the AC network of the AC / DC hybrid distribution network is equivalent to a DC node connected to the DC bus. By repeatedly alternating and iterating until the power flow results converge, the equivalent model is obtained. The equivalent model is used to calculate the transfer impedance from the target node to the short-circuit point of the branch based on the voltage of the observed node and the unit injection current of the target node in the AC / DC hybrid distribution network.

3. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 1, characterized in that, Determining the augmented distribution factor matrix of the AC / DC hybrid distribution network includes: Based on the unit current method and the equivalent model, the sensitivity of the injected power of each AC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the AC transfer distribution factor matrix is ​​obtained. Based on the equivalent model, using the constant power control mode or constant voltage control mode of the voltage source converter (VSC), the sensitivity of the injected power or voltage of each DC node in the AC / DC hybrid distribution network to the branch power distribution is calculated, and the DC transfer distribution factor matrix is ​​obtained.

4. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 3, characterized in that, The DC transfer distribution factor matrix includes the DC load transfer distribution factor matrix and the DC generation transfer factor matrix; The DC network is equivalent to the AC node on the AC network side. m The formula for calculating the DC load transfer distribution factor matrix is ​​as follows: ； in, Indicates DC network DC Load nodes in i When increasing unit power, the power allocated to the generator node j The power; Indicates communication node m When increasing unit power, the power allocated to the generator node j The power; Indicates load node i Injected power for branch b The sensitivity of the power distribution; The formula for calculating the DC power generation transfer distribution factor matrix is ​​as follows: ； in, Indicates DC network DC generator node in j When increasing unit power, the power allocated to the load node i The power; Indicates generator node j When increasing the unit power, the power allocated to the AC node m The power; Indicates generator node j Injected power for branch b The sensitivity of the power distribution.

5. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 1, characterized in that, The initial cost allocation result is corrected based on the generator-load power allocation matrix to obtain the cost allocation result, including: Obtain the initial generator-load power allocation matrix; Based on the initial generator-load power allocation matrix, the initial cost allocation result is corrected, and the power generation deviation of each generator node in the AC / DC hybrid distribution network is calculated. The power generation deviation is allocated to each load node of the AC / DC hybrid distribution network, and the load power difference of each load node is calculated. Based on the power generation deviation and the load power difference, the initial generator-load power allocation matrix is ​​updated to obtain the updated generator-load power allocation matrix; Starting with the correction of the initial cost allocation result based on the updated generator-load power allocation matrix, the process is iterated sequentially until the new generator power deviation is less than or equal to a preset deviation threshold, thus determining the final generator-load power allocation matrix. Based on the generator-load power allocation matrix, the initial cost allocation result is corrected to obtain the final cost allocation result.

6. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 5, characterized in that, The update formula for the generator-load power distribution matrix is ​​as follows: ； ； ； ； ； in, It is the first k The generator-load power allocation matrix updated after the next iteration; It is the first k The generator-load power allocation matrix updated after -1 iterations represents the... k Generator node after -1 iteration j Assigned to load nodes i The power; Indicates the first k Generator node after -1 iteration j The deviation in power generation; Indicates generator node j When increasing unit power, the power allocated to the load node i The power; Indicates the first k Load node after -1 iteration i The difference in load power; Indicates load node i When increasing unit power, the power allocated to the generator node j The power; Indicates generator node j The actual power generation capacity; Indicates the first k Generator node after -1 iteration j Total power generation; N For the set of all load nodes, M This is the set of all generator nodes; Represents a communication network ac Medium generator node j When increasing unit power, the power allocated to the load node i The power; This is the preset deviation threshold.

7. The cost allocation method for AC / DC hybrid distribution networks based on distribution factor according to claim 1, characterized in that, The cost allocation for the AC / DC hybrid distribution network includes: Calculate the line utilization level of each load node in the AC / DC hybrid distribution network at the full load level; Calculate the carbon emission cost increment of the AC / DC hybrid distribution network based on the grid loss increment caused by photovoltaic grid connection; Based on the full-load level of line usage, the incremental carbon emission cost is allocated to the relevant nodes of the AC / DC hybrid distribution network.

8. A cost-sharing device for AC / DC hybrid distribution networks based on distribution factor, characterized in that, include: Construction unit, used to construct equivalent models of AC / DC hybrid distribution networks; The equivalent model is used to calculate the transfer impedance of each node to the branch in the AC / DC hybrid distribution network. The determining unit is used to calculate the transfer impedance of each node to the branch based on the equivalent model, and to determine the augmented distribution factor matrix of the AC / DC hybrid distribution network; the augmented distribution factor matrix is ​​used to calculate the utilization degree of each node to the line in the AC / DC hybrid distribution network. The cost allocation unit is used to determine the cost allocation principle based on the augmented distribution factor matrix, allocate the cost of the AC / DC hybrid distribution network, and calculate the initial cost allocation result; the cost includes fixed cost and variable cost; The correction unit is used to correct the initial cost allocation result based on the generator-load power allocation matrix to obtain the cost allocation result; The cost allocation principles include: The fixed costs are allocated to all nodes of the AC / DC hybrid distribution network using the stamp method. Based on the augmented distribution factor matrix, the utilization level of the lines by each node in the AC / DC hybrid distribution network is calculated, and the variable cost is allocated to each node based on the utilization level of the lines by each node.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the cost allocation method for AC / DC hybrid distribution networks based on the distribution factor as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the cost allocation method for AC / DC hybrid distribution networks based on the distribution factor as described in any one of claims 1 to 7.

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