New energy station network equivalence method based on graph traversal search algorithm

Abstract

The invention provides a new energy station network equivalence method based on a graph traversal search algorithm, and the method comprises the steps: obtaining the information of a boosting transformer, new energy unit connection, a box-type transformer and the like of a new energy station, and completing the recognition of the connection relation of a new energy unit of each current collection line based on the graph traversal search algorithm; calculating the equivalent resistance, reactance and susceptance of the new energy station network based on a loss consistency principle, and then calculating the equivalent resistance, reactance and reactance of a lower current collection circuit and a box-type transformer of each boosting transformer of the new energy station; according to the method, the speed and accuracy of new energy station network equivalence are improved by utilizing a graph traversal search algorithm, the speed is shortened to 0.5 hour from 2 days of manual identification, meanwhile, the error problem of manual calculation is avoided, the method can be applied to equivalence of a large-scale new energy station network, the analysis accuracy of a power grid new energy station is improved, and the method is suitable for large-scale new energy station network equivalence. And the analysis result is closer to the actual operation of the power grid.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy station processing technology, in particular to a new energy station network equivalence method based on a graph traversal search algorithm. BACKGROUND

[0002] With the construction of new power systems, large-scale new energy grid connection, the proportion of new energy is getting higher and higher, and the new power generation proportion in local period exceeds 50%. The means of analyzing the impact of new energy on power grid stability risk analysis through building simulation models is becoming more and more important. However, a new energy station has hundreds of new energy units, or even thousands of new energy units. Limited by the node number of simulation software and the workload of building models, it is impossible to build detailed models of all new energy stations in the power grid in mechanical and electrical simulation models or electromagnetic simulation models. Therefore, it is necessary to perform network equivalence on new energy stations to reduce the number of new energy units in the simulation model.

[0003] There are various methods for current new energy station network equivalence, but all of them are manual calculation of equivalence for each line, each power collection line, and each transformer. With the increase of new energy station installed capacity, a new energy station contains hundreds or thousands of new energy units, and the number of power collection lines reaches dozens of times. It takes about 2 days to manually calculate the network equivalence of a new energy station, and manual calculation is prone to errors in some steps, which may lead to inaccurate new energy network equivalence and affect the analysis results of new energy stations. SUMMARY

[0004] In view of this, the present application proposes a new energy station network equivalence method based on a graph traversal search algorithm, which can quickly and automatically perform new energy station network equivalence work, reduce manual participation, improve efficiency, and reduce labor intensity.

[0005] The technical solution of the present application is as follows: The new energy station network equivalence method based on the graph traversal search algorithm comprises the following steps: Step S1, obtaining the step-up transformer and box transformer information, new energy unit connection information, and new energy unit rated active power of the new energy station; Step S2, classifying the new energy units according to the step-up transformer and power collection line, respectively; Step S3, completing the connection relationship of the new energy units of each power collection line based on the graph traversal search algorithm, and obtaining the maximum power flowing through each connection branch; Step S4, calculating the equivalent resistance, reactance, and susceptance of the new energy station network, the power collection line under each step-up transformer, and the box transformer under each step-up transformer based on the power loss consistency principle; Step S5, complete the network equivalence of the new energy station.

[0006] Preferably, the step S2 comprises:

[0007] Preferably, the step S2 comprises: Step S21, according to the connection relationship between the step-up transformer and the new energy unit in the new energy station, the new energy unit is divided into the new energy unit under each step-up transformer; Step S22, the new energy unit under each step-up transformer is classified according to each power collection line.

[0008] Preferably, the step S3 comprises: Step S31, obtain the new energy power collection line connection table, and define each new energy unit as a node; Step S32, starting from the step-up station node of the new energy station, query and access the new energy unit node or intermediate node directly connected with the step-up station node; Step S33, access the new energy unit node or intermediate node adjacent to the new energy unit node or intermediate node directly connected with the step-up station node; Step S34, repeat step S33 until all adjacent nodes are accessed, and form a new energy unit connection relationship graph; Step S35, based on the rated active power of each new energy unit, obtain the maximum power flowing through each connection branch.

[0009] Preferably, the new energy power collection line connection table comprises the connection starting point, node, intermediate point and ending point of the new energy unit, conductor type and conductor length.

[0010] Preferably, the intermediate node is a branch box of the power collection line.

[0011] Preferably, in the step S4, the expression for calculating the equivalent resistance of the new energy station network based on the power loss consistency principle is:

[0012] wherein is the equivalent resistance of the new energy station network, is the resistance of the line from the new energy unit node a1 to the new energy unit a2 node, is the resistance of the line from the new energy unit node an to the intermediate node 1, is the resistance of the line from the new energy unit node 1 to the new energy unit node 2, The resistance of the line from the new energy unit node 3 to the intermediate node 1, The resistance of the line from the new energy unit node n-1 to the new energy unit node an, The resistance of the line from the new energy unit node n to the new energy unit booster station node, The resistance of the line from the intermediate node 1 to the new energy unit node n-1, 、 、 The rated active power of the new energy unit nodes 1, 3, and n, 、 The rated active power of the new energy unit nodes a1, a2, and an, and n is the number of new energy unit nodes.

[0013] Preferably, the expression for calculating the equivalent reactance of the new energy station network in step S4 based on the power loss consistency principle is:

[0014] wherein is the equivalent reactance of the new energy station network, is the reactance of the line from the new energy unit node a1 to the new energy unit node a2, is the reactance of the line from the new energy unit node an to the intermediate node 1, is the reactance of the line from the new energy unit node 1 to the new energy unit node 2, is the reactance of the line from the new energy unit node 3 to the intermediate node 1, is the reactance of the line from the new energy unit node n-1 to the new energy unit node an, is the reactance of the line from the new energy unit node n to the new energy unit booster station node, is the reactance of the line from the intermediate node 1 to the new energy unit node n-1, 、 、 The rated active power of the new energy unit nodes 1, 3, and n, 、 The rated active power of the new energy unit nodes a1, a2, and an, and n is the number of new energy unit nodes.

[0015] Preferably, the expression for calculating the equivalent reactance of the new energy station network in step S4 based on the power loss consistency principle is:

[0016] wherein is the equivalent reactance of the new energy station network, is the reactance of the line from the new energy unit node 1 to the new energy unit node 2, Bn is the susceptance of the line from the new energy unit node n to the new energy station step-up station node, Bm is the susceptance of the line from the intermediate node 1 to the new energy unit node n-1, Bna is the susceptance of the line from the new energy unit node a1 to the new energy unit node a2 node, Bna is the susceptance of the line from the new energy unit node an to the intermediate node 1.

[0017] Preferably, the calculation method of the equivalent resistance, reactance and susceptance of each power collection line under the transformer in the step S4 is the same as the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network, the impedance of all power collection lines is ignored in the step S4, all box-type transformers under each step-up transformer are in parallel relationship, and the equivalent resistance, reactance and susceptance of the box-type transformers under each step-up transformer are calculated based on the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network.

[0018] Compared with the prior art, the beneficial effects of the present application are: (1) The rate of new energy network equivalence is improved, the network equivalence working time of the new energy station is shortened from 2 days to 0.5 hours, and the application is brought into the network equivalence of large-scale new energy station and verified in the station-level simulation modeling of the new energy station.

[0019] (2) The accuracy of new energy network equivalence is improved, the accuracy of new energy station network equivalence is improved to 99%, and human error events are avoided as much as possible.

[0020] (3) By improving the rate and accuracy of new energy station network equivalence, the analysis accuracy of the power grid new energy station is improved, and the analysis result is closer to the actual operation of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only preferred embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The flowchart of the new energy station network equivalence method based on the graph traversal search algorithm of the present application; Figure 2 The flowchart of the step S2 of the new energy station network equivalence method based on the graph traversal search algorithm of the present application; Figure 3 The flowchart of the step S3 of the new energy station network equivalence method based on the graph traversal search algorithm of the present application; Figure 4 The new energy unit connection relationship graph is constructed for the new energy station network equivalence method based on the graph traversal search algorithm of the application; Figure 5 The I-back power collection line photovoltaic power generation unit connection graph is constructed for the embodiment of the application. Figure 6 The II-back power collection line photovoltaic power generation unit connection graph is constructed for the embodiment of the application. DETAILED DESCRIPTION

[0023] In order to better understand the technical content of the application, a specific embodiment is provided below, and the application is further described in combination with the drawings.

[0024] Referring to Figures 1 to 3 The new energy station network equivalence method based on the graph traversal search algorithm provided by the application comprises the following steps: Step S1, obtaining the step-up transformer and box-type transformer information, new energy unit connection information and rated active power of the new energy unit of the new energy station; Step S2, classifying the new energy unit according to the step-up transformer and the power collection line respectively; Step S3, completing the connection relationship of the new energy unit of each back power collection line based on the graph traversal search algorithm, and obtaining the maximum power flowing through each connection branch; Step S4, calculating the equivalent resistance, reactance and susceptance of the new energy station network, the power collection line under each step-up transformer and the box-type transformer under each step-up transformer respectively based on the power loss consistency principle; Step S5, completing the network equivalence of the new energy station.

[0025] The new energy station network equivalence method based on the graph traversal search algorithm of the application firstly obtains the step-up transformer, box-type transformer, unit connection information and rated active power of the new energy station, classifies the new energy unit according to the step-up transformer and the power collection line, and determines the unit connection relationship and the maximum power of the branch of the power collection line by using the graph traversal search algorithm, which lays a solid foundation for subsequent accurate analysis and equivalence calculation. On the one hand, the connection structure of the station equipment can be clearly combed, which is beneficial to the quick positioning of the fault position by the operation and maintenance personnel, shortens the fault troubleshooting time and improves the operation reliability of the station. On the other hand, the maximum power of each branch is mastered, which provides a basis for reasonable planning of power generation output and optimization of energy distribution, avoids line overload and improves energy utilization efficiency.

[0026] Then, the equivalent resistance, reactance and susceptance of the new energy station network, power collection line and box-type transformer are calculated based on the power loss consistency principle, and the network equivalence is completed, which effectively simplifies the complex new energy station network model, reduces the calculation complexity while retaining the key electrical characteristics, greatly improves the efficiency of power system analysis and simulation, and makes the analysis results more in line with the actual operation through the accurate equivalent model provided, so as to help the stable operation of the power system and promote the efficient grid connection and consumption of new energy.

[0027] Preferably, the step S1 comprises:

[0028] Before the network equivalence of the new energy station, some basic information needs to be obtained, including the basic power information of the high-voltage side and the low-voltage side of the step-up transformer and the box-type transformer, including voltage, capacity, short-circuit impedance, short-circuit loss, no-load current and no-load loss, etc., so as to accurately calculate the resistance, reactance and susceptance subsequently, and the connection information associated with the new energy unit also needs to be obtained, including the connection information of the target unit, the branch box and the adjacent equipment of the same type of the target unit, the connection information of the power collection equipment, and the length and type of the adjacent connection line, etc., so as to construct the connection relationship graph of the new energy unit subsequently.

[0029] Preferably, the step S2 comprises: Step S21, according to the connection relationship between the step-up transformer and the new energy unit in the new energy station, the new energy unit is divided into new energy units under each step-up transformer; Step S22, the new energy units under each step-up transformer are classified according to each power collection line, and the number of step-up transformers is classified into several categories.

[0030] The number of step-up transformers in the new energy station is not combined and equivalent, i.e. classified according to the actual number of step-up transformers, so that the new energy unit can be classified according to the connection relationship of the step-up transformer in the new energy station, and then classified according to each power collection line.

[0031] Preferably, the step S3 comprises: Step S31, obtaining a new energy power collection line connection table, the new energy power collection line connection table comprising a new energy unit connection starting point, node, intermediate point and end point, conductor type and conductor length, and each new energy unit is defined as a node; Step S32, from the booster station node of the new energy station, query and access the new energy unit node or intermediate node directly connected with the booster station node, and the intermediate node is the branch box of the power collection line; Step S33, access the new energy unit node or intermediate node adjacent to the new energy unit node or intermediate node directly connected with the booster station node; Step S34, repeat step S33 until all adjacent nodes are accessed, and form a new energy unit connection relationship graph; Step S35, based on the rated active power of each new energy unit, obtain the maximum power flowing through each connection branch.

[0032] The present application introduces a graph traversal search algorithm for the equivalence of various parameters, wherein a new energy power collection line connection table needs to be obtained first, the connection table contains the connection starting point and end point of the new energy unit, the conductor type and the conductor length, etc., then each new energy unit in the connection table is defined as a common node, and the branch box of the power collection line is taken as an intermediate node, taking the booster station of the new energy station as the starting node, after querying the new energy unit node or intermediate node directly connected with the booster station node, the adjacent new energy unit node or intermediate node is accessed in turn, after accessing all nodes, a new energy unit connection relationship graph can be formed, and then based on the collected rated active power of the new energy unit, the maximum power flowing through each connection branch can be obtained, and the formed new energy unit connection relationship graph is as shown in Figure 4 The new energy station booster station node is connected with the new energy unit node n, the new energy unit node n is connected with the new energy unit node n-1, the new energy unit node n-1 is connected with the branch box intermediate node 1 of the power collection line, the intermediate node 1 is connected with the new energy unit node 3 of the dry-type line and the branch line new energy unit node an, the new energy unit node 3 is connected with the new energy unit node 2, the new energy unit node 2 is connected with the new energy unit node 1, the branch line new energy unit node an is connected with the new energy unit node a2, the new energy unit node a2 is connected with the new energy unit node a1, and the equivalent resistance, reactance and susceptance of the new energy station network are calculated based on the new energy unit connection relationship graph shown in Figure 4 The calculation is based on the power loss consistency principle, and the expressions of the calculation are as follows: Preferably, the expression for calculating the equivalent resistance of the new energy station network based on the power loss consistency principle in step S4 is:

[0033] wherein is the equivalent resistance of the new energy station network, is the resistance of the line from the new energy unit node a1 to the new energy unit node a2. Ran,1 is the resistance of the line from new energy unit node 1 to new energy unit node 2, Ran,1 is the resistance of the line from new energy unit node 1 to new energy unit node 2, Ran,1 is the resistance of the line from new energy unit node 3 to intermediate node 1, Ran,1 is the resistance of the line from new energy unit node 3 to intermediate node 1, Ran,1 is the resistance of the line from new energy unit node 3 to intermediate node 1, Ran,1 is the resistance of the line from new energy unit node 3 to intermediate node 1, 、 、 Pn,1 is the rated active power of new energy unit node 1, node 3, node n, 、 Pn,1 is the rated active power of new energy unit node 1, node 3, node n,

[0034] Preferably, the expression for calculating the equivalent reactance of the new energy station network in step S4 based on the power loss consistency principle is:

[0035] wherein Xan,1 is the equivalent reactance of the new energy station network, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, Xan,1 is the reactance of the line from new energy unit node a1 to new energy unit a2 node, 、 、 Pn,1 is the rated active power of new energy unit node 1, node 3, node n, 、 Pn,1 is the rated active power of new energy unit node 1, node 3, node n,

[0036] Preferably, the expression for calculating the equivalent reactance of the new energy station network in step S4 based on the power loss consistency principle is:

[0037] wherein is the equivalent susceptance of the new energy station network, is the reactance of the line from new energy unit node 1 to new energy unit node 2, is the susceptance of the line from new energy unit node n to new energy station booster station node, is the susceptance of the line from intermediate node 1 to new energy unit node n-1, is the susceptance of the line from new energy unit node a1 to new energy unit node a2, is the susceptance of the line from new energy unit node an to intermediate node 1.

[0038] Preferably, the calculation method of the equivalent resistance, reactance and susceptance of the power collection line under each transformer in the step S4 is the same as the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network, all the impedances of the power collection lines are ignored in the step S4, all the box-type transformers under each booster transformer are in parallel relationship, and the equivalent resistance, reactance and susceptance of the box-type transformers under each booster transformer are calculated based on the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network.

[0039] After the equivalent resistance, reactance and susceptance of the new energy station network are calculated, since all the power collection lines under each transformer are in parallel relationship, the equivalent resistance, reactance and susceptance of the power collection lines under each transformer are calculated based on the power loss consistency principle and with reference to the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network.

[0040] After the impedances of all the power collection lines are ignored, all the box-type transformers under each booster transformer can be regarded as being directly connected to the new energy station booster, i.e., all the box-type transformers under each booster transformer are in parallel relationship, and then the equivalent resistance, reactance and susceptance of the box-type transformers under each booster transformer can be calculated based on the power loss consistency principle and with reference to the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network.

[0041] The new energy station network equivalence method based on the graph traversal search algorithm of the application, after collecting the basic information related to the new energy station, classifies the new energy unit, then introduces the graph traversal search algorithm to construct the new energy unit connection relationship graph, and calculates the maximum power flowing through each connection branch based on the new energy unit connection relationship graph, and finally based on the power loss consistency principle, the equivalent resistance, reactance and admittance of the new energy station network, the power collection line under each step-up transformer, and the box-type transformer under each step-up transformer can be calculated respectively, the new energy station equivalence calculation is completed, which does not depend on manual calculation and avoids the occurrence of human error events, can be applied in the equivalence calculation of large-scale new energy stations, automatically, batch and efficiently completes the new energy station network equivalence, improves the analysis accuracy of the new energy station of the power grid, and makes the analysis result closer to the actual operation of the power grid.

[0042] The beneficial effects of the application are verified by an embodiment as follows: The method of the application is applied to the equivalence of a certain photovoltaic power station network, the photovoltaic power station has 1 step-up transformer and 2 power collection lines, the rated capacity of the photovoltaic power generation unit of the I power collection line is shown in Table 1: Table 1

[0043] The connection relationship and line parameters are shown in Table 2: Table 2

[0044] The rated capacity of the photovoltaic power generation unit of the II power collection line is shown in Table 3: Table 3

[0045] The connection relationship and line parameters are shown in Table 4: Table 4

[0046] The graph traversal search algorithm of the application is applied to search the I power collection line photovoltaic power generation unit connection graph and the II power collection line photovoltaic power generation unit connection graph, as shown in Figures 5-6As shown, the equivalent resistance of the I-phase collection line is 0.102 Ω, the reactance is 0.174 Ω, and the susceptance is 0.00014 S based on the power loss consistency principle; the equivalent resistance of the II-phase collection line is 0.105 Ω, the reactance is 0.140 Ω, and the susceptance is 0.00016 S; the equivalent resistance of the two-phase collection line is 0.052 Ω, the reactance is 0.080 Ω, and the susceptance is 0.00030 S based on the power loss consistency principle; the photovoltaic power station has a total of 15 box transformers and 3 models; according to the model and parameters of the box transformer, the impedance of all the collection lines is ignored, that is, all the box transformers are regarded as a parallel relationship; the equivalent resistance of the box transformer is 0.017 Ω, the reactance is 0.166 Ω, and the susceptance is 0.00191 Ω based on the power loss consistency principle.

[0047] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A new energy station network equivalence method based on a graph traversal search algorithm, characterized in that, The method comprises the following steps: Step S1, obtaining the step-up transformer and box transformer information, new energy unit connection information and new energy unit rated active power of the new energy station; Step S2, classifying the new energy units according to the step-up transformer and the power collection line respectively; Step S3, completing the connection relationship of the new energy units of each power collection line based on a graph traversal search algorithm, and obtaining the maximum power flowing through each connection branch; Step S4, calculating the equivalent resistance, reactance and susceptance of the new energy station network, the power collection line under each step-up transformer and the box transformer under each step-up transformer based on the power loss consistency principle respectively; Step S5, completing the network equivalence of the new energy station.

2. The new energy station network equivalence method based on graph traversal search algorithm according to claim 1, characterized in that, The step-up transformer and box transformer information includes high-voltage side and low-voltage side voltage, capacity, short-circuit impedance, short-circuit loss, no-load current and no-load loss; the new energy unit connection information includes adjacent connection information of the new energy unit and adjacent connection line length, line type.

3. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, The step S2 comprises: Step S21, dividing the new energy units into new energy units under each step-up transformer according to the connection relationship between the step-up transformer and the new energy units in the new energy station; Step S22, classifying the new energy units under each step-up transformer according to each power collection line.

4. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, The step S3 comprises: Step S31, obtaining a new energy power collection line connection table, and defining each new energy unit as a node; Step S32, starting from the step-up station node of the new energy station, querying and accessing the new energy unit node or intermediate node directly connected to the step-up station node; Step S33, accessing the new energy unit node or intermediate node adjacent to the new energy unit node or intermediate node directly connected to the step-up station node; Step S34, repeating step S33 until all adjacent nodes are accessed, and forming a new energy unit connection relationship graph; Step S35, obtaining the maximum power flowing through each connection branch based on the rated active power of each new energy unit.

5. The new energy station network equivalent method based on graph traversal search algorithm according to claim 4, characterized in that, The new energy power collection line connection table includes the connection starting point, node, intermediate point and ending point of the new energy unit, conductor type and conductor length.

6. The new energy station network equivalent method based on graph traversal search algorithm according to claim 4, characterized in that, The intermediate node is a branch box of the power collection line.

7. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, In step S4, the expression for calculating the equivalent resistance of the new energy station network based on the power loss consistency principle is: wherein is the equivalent resistance of the new energy station network, is the resistance of the line from the new energy unit node a1 to the new energy unit a2 node, is the resistance of the line from the new energy unit node an to the intermediate node 1, is the resistance of the line from the new energy unit node 1 to the new energy unit node 2, is the resistance of the line from the new energy unit node 3 to the intermediate node 1, is the resistance of the line from the new energy unit node n-1 to the new energy unit node an, is the resistance of the line from the new energy unit node n to the new energy unit booster station node, is the resistance of the line from the intermediate node 1 to the new energy unit node n-1, , , is the rated active power of the new energy unit node 1, node 3, node n, , is the rated active power of the new energy unit node a1, node a2, node an, and n is the number of new energy unit nodes.

8. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, In step S4, the expression for calculating the equivalent reactance of the new energy station network based on the power loss consistency principle is: wherein is the equivalent reactance of the new energy station network, is the reactance of the line from the new energy unit node a1 to the new energy unit a2 node, is the reactance of the line from the new energy unit node an to the intermediate node 1, is the reactance of the line from the new energy unit node 1 to the new energy unit node 2, is the reactance of the line from the new energy unit node 3 to the intermediate node 1, is the reactance of the line from the new energy unit node n-1 to the new energy unit node an, is the reactance of the line from the new energy unit node n to the new energy unit booster station node, is the reactance of the line from the intermediate node 1 to the new energy unit node n-1, , , is the rated active power of the new energy unit node 1, node 3, node n, , is the rated active power of the new energy unit node a1, node a2, node an, and n is the number of new energy unit nodes.

9. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, In step S4, the expression for calculating the equivalent susceptance of the new energy station network based on the power loss consistency principle is: wherein is the equivalent susceptance of the new energy station network, is the reactance of the line from new energy unit node 1 to new energy unit node 2, is the susceptance of the line from new energy unit node n to new energy station booster station node, is the susceptance of the line from intermediate node 1 to new energy unit node n-1, is the susceptance of the line from new energy unit node a1 to new energy unit node a2 node, is the susceptance of the line from new energy unit node an to intermediate node 1.

10. The new energy station network equivalent method based on graph traversal search algorithm according to claim 1, characterized in that, In step S4, the calculation method of the equivalent resistance, reactance and susceptance of the power collection line under each transformer is the same as that of the equivalent resistance, reactance and susceptance of the new energy station network, all the impedances of the power collection line are ignored in step S4, all the box transformers under each step-up transformer are in parallel relationship, and the equivalent resistance, reactance and susceptance of the box transformer under each step-up transformer are calculated based on the calculation method of the equivalent resistance, reactance and susceptance of the new energy station network.

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