CN116805029A - Earth potential distribution calculation method, device and system based on actual measurement of direct current magnetic bias current of power grid and storage medium - Google Patents
Earth potential distribution calculation method, device and system based on actual measurement of direct current magnetic bias current of power grid and storage medium Download PDFInfo
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Abstract
The application provides a method, a device, a system and a storage medium for calculating the distribution of ground potential based on actual measurement of DC magnetic bias current of a power grid, wherein the method comprises the following steps: obtaining a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding near zone; establishing a node admittance matrix equation according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line; obtaining direct current magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant; converting the actually measured direct current magnetic bias current of each station into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then obtaining the ground potential distribution by combining the distance between each node and the direct current grounding electrode. The method solves the problem that in the traditional forward solving process of the ground potential distribution, the potential distribution estimation deviation is large due to the difficulty in modeling of large-scale deep ground resistors, so that the direct current bias current distribution of the direct current grounding near region is inaccurate in prediction.
Description
Technical Field
The application relates to the field of ground potential distribution calculation, in particular to a ground potential distribution calculation method, device, system and storage medium based on actual measurement of direct current magnetic bias current of a power grid.
Background
When the direct current transmission project operates in a monopole earth or bipolar unbalanced mode, the grounding electrode can inject direct current, so that the alternating current power grid near the grounding electrode generates direct current magnetic bias, and the safe and stable operation of the main transformer in the transformer substation is affected. In recent years, with the popularization of the direct current transmission technology in China, single-pole locking occurs for many times in a dense area where the direct current transmission falls to the ground, so that the problem of main-transformer direct current magnetic bias of a regional power grid is outstanding, and the local alternating current power grid is seriously influenced. In the evaluation and defense of the DC magnetic bias risk of the power grid, the variation of the ground potential lifting caused by the injection of the DC current of the kA level into the DC grounding electrode is a main factor influencing the DC magnetic bias distribution, and the accurate prediction and calculation of the ground potential distribution variation are important points and difficulties in the field.
The traditional calculation method of the ground potential distribution is to inversely establish a ground layering model through the ground soil resistivity distribution measured by a quadrupole method or a ground electromagnetic method, and then calculate the ground potential rise at the two ends of the direct current transmission engineering by the current field of the direct current grounding electrode. Because of the complex earth structure, the measurement and calculation of the soil resistivity have larger errors, which directly leads to the difficulty in accurately calculating the earth potential distribution in the complex soil structure area by the traditional method.
Disclosure of Invention
The application provides a calculation method, a device, a system and a storage medium for obtaining ground potential distribution through inversion of a measured result of DC magnetic bias current of a power grid, and the method aims at the DC magnetic bias problem of an AC power grid around a grounding electrode caused by a DC power transmission system, and provides accurate data support for the defense and treatment of future DC magnetic bias of the area by combining a known and determined topological structure of the AC power grid and DC impedance equivalent parameters of the AC power grid and a measured result of the ground current of a main transformer neutral point of the neutral point grounding AC system.
A ground potential distribution calculation method based on actual measurement of DC magnetic bias current of a power grid comprises the following steps:
step one, obtaining a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
establishing a node admittance matrix equation of the neutral point grounding alternating current power grid in a certain range of a direct current grounding near zone according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line;
step three, obtaining direct current magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant;
and fourthly, converting the direct current magnetic bias current of each station obtained through actual measurement into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then obtaining the ground potential distribution by combining the distance between each node and the direct current grounding electrode.
Further, the third step includes: and connecting the DC current sensors to the neutral point grounding lead of the transformer of each transformer substation and each power plant, and arranging a synchronous monitoring terminal so as to realize synchronous actual measurement and acquisition of DC magnetic bias current of each station when the DC power transmission system operates in a monopolar earth or bipolar unbalanced mode.
Further, the node admittance matrix equation is:
from yu=i, we get u=y -1 I, i.e
Wherein Y is the electric networkA node admittance matrix; y is Y -1 An inverse matrix of the node admittance matrix of the power grid; u is a node voltage column vector; i is the node injection current column vector, G is the node self admittance and mutual admittance; n is the node number of the power grid, and the voltages of the n nodes are U respectively 1 、U 2 、U 3 、…、U n The method comprises the steps of carrying out a first treatment on the surface of the From E i ＝R i I i +U i Calculating to obtain arbitrary grounding branch, namely the ground potential E of each transformer substation i ，R i Is the grounding resistance of the transformer substation, I i For the actual measured DC bias current of the transformer substation, U i The potential of the node associated with the transformer substation.
A ground potential distribution calculating device based on actual measurement of DC magnetic bias current of a power grid comprises:
the topological structure acquisition module is used for acquiring a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding very near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
the node admittance matrix equation building module is used for building a node admittance matrix equation of the neutral point grounding alternating current power grid in a certain range of the direct current grounding extremely near zone according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line;
the DC magnetic bias current acquisition module is used for acquiring DC magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant;
the ground potential distribution acquisition module is used for converting the actually measured DC bias current of each station into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then combining the distance between each node and the DC grounding electrode to obtain the ground potential distribution.
Further, the direct current magnetic bias current acquisition module comprises direct current sensors and synchronous monitoring terminals which are connected to the neutral point grounding lead of the transformer of each transformer substation and each power plant, so that when the direct current transmission system operates in a monopolar earth or bipolar unbalanced mode, the direct current magnetic bias current of each station is synchronously and actually measured and acquired.
Further, the node admittance matrix equation is:
from yu=i, we get u=y -1 I, i.e
Wherein Y is a node admittance matrix of the power grid; y is Y -1 An inverse matrix of the node admittance matrix of the power grid; u is a node voltage column vector; i is the node injection current column vector, G is the node self admittance and mutual admittance; n is the node number of the power grid, and the voltages of the n nodes are U respectively 1 、U 2 、U 3 、…、U n The method comprises the steps of carrying out a first treatment on the surface of the From E i ＝R i I i +U i Calculating to obtain arbitrary grounding branch, namely the ground potential E of each transformer substation i ，R i Is the grounding resistance of the transformer substation, I i For the actual measured DC bias current of the transformer substation, U i The potential of the node associated with the transformer substation.
A ground potential distribution computing system based on actual measurement of DC magnetic bias current of a power grid comprises: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is used for reading executable instructions stored in the computer readable storage medium and executing the ground potential distribution calculation method based on the actual measurement of the DC magnetic bias current of the power grid.
A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for calculating a distribution of ground potential based on actual measurement of dc bias current of a power grid.
The application establishes the admittance matrix of the network node based on the network topology and the DC impedance parameters of the AC system in a certain range of the DC grounding near zone; the node voltage of the node network is obtained through the direct-current magnetic bias current monitoring terminals arranged on each transformer substation, so that the problem that in the traditional forward solving process of the ground potential distribution, the potential distribution estimation deviation is large due to the difficulty in modeling of large-scale deep ground resistors, and the direct-current magnetic bias current distribution of the direct-current grounding very near zone is inaccurate is solved.
Drawings
FIG. 1 is an equivalent schematic diagram of a grounding branch including an equivalent voltage source and a grounding resistor according to an embodiment of the present application;
FIG. 2 is an equivalent circuit diagram of an n-node DC network in accordance with an embodiment of the present application;
FIG. 3 is a simplified equivalent circuit diagram of an n-node DC network in accordance with an embodiment of the present application;
FIG. 4 is a schematic diagram of a ground branch circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a network topology of a system according to an embodiment of the present application;
FIG. 6 is a network equivalent circuit diagram of an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a ground potential distribution calculation method based on actual measurement of a power grid direct current magnetic bias current, which comprises the following steps:
step one, obtaining a topological structure of a neutral point grounding alternating current power grid in a certain range (for example, 110kV and above) of a direct current grounding very near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
step two, according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the transmission line, establishing a node admittance matrix equation of a neutral point grounding alternating current power grid in a certain range (for example, 110kV and above) of a direct current grounding extremely near zone;
step three, obtaining direct current magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant, specifically, connecting a direct current sensor at the neutral point grounding lead of the transformer of each transformer substation and each power plant, and arranging a synchronous monitoring terminal so as to realize synchronous actual measurement and acquisition of the direct current magnetic bias current of each station when the direct current transmission system operates in a monopolar earth or bipolar unbalanced mode;
step four, solving the distribution of the ground potential of the direct current grounding near zone: converting the actually measured direct current magnetic bias current of each station into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then obtaining the ground potential distribution by combining the distance between each node and the direct current grounding electrode.
When the alternating current power grid is used as a direct current fluctuation source monitoring network, the alternating current power grid can be equivalent to a linear resistance network under the condition of a known current source. According to the embodiment of the application, aiming at an alternating current power grid in a direct current grounding very near zone, a node voltage model of the alternating current power grid is established through an equivalent direct current circuit network and a transformer neutral point direct current actual measurement result, and then inversion solution is carried out on the ground potential distribution of the zone.
The method is characterized in that node voltage is solved by a node voltage method under the condition that current is known according to an established equivalent direct current circuit network of an alternating current power grid.
For the alternating current power grid with any topological structure and any voltage class interconnection, the calculation method of the current distribution can be solved by using a node voltage method. For a power grid with any topological structure, the node voltage equation of the power grid is in a matrix form:
YU＝I (1)
from equation (1), the matrix form of the node voltages U is obtained as:
U＝Y -1 I (2)
wherein Y is a node admittance matrix of the power grid; y is Y -1 An inverse matrix of the node admittance matrix of the power grid; u is a node voltage column vector; i is the node injection current column vector.
For a network containing n nodes, the self-admittance of each node and the mutual admittance between the nodes are first found. The self admittance is positive and is equal to the sum of the conductance of the branch circuits connected with each node; the admittance of the nodes is negative and is equal to the negative value of the conductance of the branch connected between the two nodes, so that the node admittance matrix is constructed. The node injection current is equal to algebraic sum of current sources flowing to the node, the current flowing into the node takes "+", the current flowing out of the node takes "-", and the injection current source also comprises a current source formed by equivalent transformation of a series combination of a voltage source and a resistor.
For any network with n nodes, the node voltage equation can be obtained, wherein G is the self admittance and the mutual admittance of the nodes, and can be obtained according to the direct current resistance of the transformer winding in the station and the direct current resistance of the transmission line and the conductance calculated according to the network topology of the alternating current power grid; u is the potential of each node, namely the potential of the site where each node is located, and is the direct result of solving the ground potential; i is node inflow current, namely, actually measured and obtained direct current magnetic bias current of each station:
when the model is constructed, the grounding branch contains both the grounding resistance and the equivalent voltage source. According to the actual requirements of the project, and the grounding current is known, for the sake of simplifying calculation, the grounding path including the equivalent voltage source and the grounding resistor is utilized to replace theorem, and the actually measured direct current bias current is equivalent to the current source, as shown in fig. 1.
The equivalent circuit of the n-node direct current network is shown in fig. 2. And after the grounding branch in the direct current equivalent circuit is equivalent by a current source, an n-node direct current network simplified equivalent circuit diagram is obtained and is shown in figure 3.
According to the n node shown in FIG. 3The direct current network simplifies the equivalent circuit, and the node voltage can be solved by using a node voltage method. Let n node voltages be U 1 、U 2 、U 3 、…、U n The node admittance matrix equation can be expressed as:
from yu=i, u=y can be obtained -1 I, i.e
The node voltage U can be calculated by the method (5) 1 、U 2 、U 3 、…、U n . According to the obtained node voltage, according to the grounding branch circuit shown in FIG. 4, by E i ＝R i I i +U i The ground potential E of any grounding branch, namely each transformer substation, can be calculated i 。
The ground potential distribution calculation process is described below with one specific example:
according to the topology illustration in fig. 5, the substation 1 is the closest to the ground, with the highest rise in ground potential. For 110kV networks, the transformer substation 1 is in the middle position, the wind farm 6 and the wind farm 5 are stations with highest ground potential rise, I 1 The flow direction of (c) is not determined. Due to I e Is I 1 And I 2 Is defined as I. When the voltage exceeds 10A, the influence on ground potential rise is more than 5V, so that the direct current bias currents of the 110kV network and the 220kV network are mutually influenced at the neutral point of the transformer substation 1 and are not independent equivalent systems. The actual measured current at the 110kV side of the similar transformer substation is only 2.38A, and the influence is small.
Table 1 actual measurement results of DC bias current of the system
| Station for a field | Actual measurement of DC bias current |
| Substation 1 | -14.75 |
| Wind farm 6 | 30.74 |
| Wind farm 5 | 17.60 |
| Wind farm 7 | -8.40 |
The substation 1 is used as a hub substation of a wind power plant system accessed into a power grid, and 7 new energy stations are connected with the hub substation. In the equivalent calculation of the dc bias current, the system can be simplified into a star-shaped equivalent network, as shown in fig. 6. In the star network, a line equivalent resistor RL, a new energy station main transformer equivalent resistor RT and a station grounding resistor R e Merging into consideration, i.e. R in FIG. 6 2 The method comprises the steps of carrying out a first treatment on the surface of the Equivalent resistor R of access junction substation T110 And the station ground resistance R e Can be taken into account, i.e. R in FIG. 6 1 . The main transformer equivalent parameters can be obtained by referring to the main transformer nameplate parameters, the line equivalent parameters can be obtained through line parameter tests, the transformer substation grounding impedance can be obtained through grounding grid tests, and the main transformer nameplate parameters can be referred to in handover test reports.
Substituting the measured DC bias current result and the equivalent impedance of the system network into the formula (5) to obtain the ground potential difference between the transformer substation 1 and each wind power plant as shown in table 2. Wherein U is Substation 1 -U Wind farm 2 The calculation result of the method is similar to the potential difference actually measured by the series capacitor in the field, and the accuracy of the ground potential distribution obtained by the method is proved.
TABLE 2 calculation results of ground potential difference
The application has the following beneficial effects:
1. the application can obtain the distribution of the ground potential in a certain range of the direct current grounding near zone on the basis of a known and quantitative topological structure and direct current resistance parameters through a direct current magnetic bias current monitoring system arranged in an alternating current power grid;
2. the direct current grounding extremely near zone has larger potential fluctuation and larger change of the earth resistivity, the error of the earth potential distribution calculated by the traditional earth resistance model in the grounding extremely near zone is larger, the known quantity calculated and adopted by the application is more accurate than that of the traditional earth resistivity model, and the earth potential distribution in the direct current grounding extremely wide area range can be partially corrected;
3. in the new station construction and reconstruction construction of the direct current grounding near-area alternating current power grid and the operation mode adjustment of the area network, the corrected ground potential distribution can provide accurate prediction of direct current magnetic bias current distribution for an alternating current system with a changed topology network, and provide strategy support for direct current magnetic bias treatment.
Another aspect of the present application provides a device for calculating a distribution of ground potential based on actual measurement of dc bias current of a power grid, including:
the topological structure acquisition module is used for acquiring a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding very near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
the node admittance matrix equation building module is used for building a node admittance matrix equation of the neutral point grounding alternating current power grid in a certain range of the direct current grounding extremely near zone according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line;
the DC magnetic bias current acquisition module is used for acquiring DC magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant;
the ground potential distribution acquisition module is used for converting the actually measured DC bias current of each station into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then combining the distance between each node and the DC grounding electrode to obtain the ground potential distribution.
In another aspect, the application provides a system for calculating the distribution of the ground potential based on the actual measurement of the DC bias current of the power grid, comprising: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is configured to read executable instructions stored in the computer readable storage medium, and execute the ground potential distribution calculation method based on actual measurement of the dc bias current of the power grid according to the first aspect.
In another aspect, the present application provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for calculating a distribution of ground potential based on actual measurement of dc bias current of a power grid according to the first aspect.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (8)
1. The ground potential distribution calculation method based on the actual measurement of the DC magnetic bias current of the power grid is characterized by comprising the following steps:
step one, obtaining a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
establishing a node admittance matrix equation of the neutral point grounding alternating current power grid in a certain range of a direct current grounding near zone according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line;
step three, obtaining direct current magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant;
and fourthly, converting the direct current magnetic bias current of each station obtained through actual measurement into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then obtaining the ground potential distribution by combining the distance between each node and the direct current grounding electrode.
2. The method for calculating the distribution of the ground potential based on actual measurement of the direct current magnetic bias current of the power grid according to claim 1, wherein the method comprises the following steps: the third step comprises the following steps: and connecting the DC current sensors to the neutral point grounding lead of the transformer of each transformer substation and each power plant, and arranging a synchronous monitoring terminal so as to realize synchronous actual measurement and acquisition of DC magnetic bias current of each station when the DC power transmission system operates in a monopolar earth or bipolar unbalanced mode.
3. The method for calculating the distribution of the ground potential based on actual measurement of the direct current magnetic bias current of the power grid according to claim 1, wherein the method comprises the following steps: the node admittance matrix equation for constructing the direct current grounding near-area alternating current power grid is as follows:
from yu=i, we get u=y -1 I, i.e
Wherein Y is a node admittance matrix of the power grid; y is Y -1 An inverse matrix of the node admittance matrix of the power grid; u is a node voltage column vector; i is the node injection current column vector, G is the node self admittance and mutual admittance; n is the node number of the power grid, and the voltages of the n nodes are U respectively 1 、U 2 、U 3 、…、U n The method comprises the steps of carrying out a first treatment on the surface of the From E i ＝R i I i +U i Calculating to obtain arbitrary grounding branch, namely the ground potential E of each transformer substation i ，R i Is the grounding resistance of the transformer substation, I i For the actual measured DC bias current of the transformer substation, U i The potential of the node associated with the transformer substation.
4. The utility model provides a earth potential distribution calculation device based on electric wire netting direct current magnetic bias current actual measurement which characterized in that includes:
the topological structure acquisition module is used for acquiring a topological structure of a neutral point grounding alternating current power grid in a certain range of a direct current grounding very near zone, wherein the topological structure comprises grounding resistors of a transformer substation and a power plant, a direct current resistor of a transformer winding and a direct current resistor of a power transmission line;
the node admittance matrix equation building module is used for building a node admittance matrix equation of the neutral point grounding alternating current power grid in a certain range of the direct current grounding extremely near zone according to the topological structure, the grounding resistance of each station, the main transformer and the direct current resistance parameters of the power transmission line;
the DC magnetic bias current acquisition module is used for acquiring DC magnetic bias current at the neutral point grounding lead of the transformer of each transformer substation and each power plant;
the ground potential distribution acquisition module is used for converting the actually measured DC bias current of each station into each node current, substituting the node current into the node admittance matrix equation, solving the node potential, and then combining the distance between each node and the DC grounding electrode to obtain the ground potential distribution.
5. The ground potential distribution calculating device based on actual measurement of direct current magnetic bias current of power grid according to claim 4, wherein: the direct current magnetic bias current acquisition module comprises direct current sensors and synchronous monitoring terminals which are connected to the neutral point grounding lead of the transformer of each transformer substation and each power plant, so that when the direct current transmission system operates in a monopolar earth or bipolar unbalanced mode, the direct current magnetic bias current of each station is synchronously and actually measured and acquired.
6. The ground potential distribution calculating device based on actual measurement of direct current magnetic bias current of power grid according to claim 4, wherein: the node admittance matrix equation is:
from yu=i, we get u=y -1 I, i.e
Wherein Y is a node admittance matrix of the power grid; y is Y -1 An inverse matrix of the node admittance matrix of the power grid; u is a node voltage column vector; i is the node injection current column vector, G is the node self admittance and mutual admittance; n is the node number of the power grid, and the voltages of the n nodes are U respectively 1 、U 2 、U 3 、…、U n The method comprises the steps of carrying out a first treatment on the surface of the From E i ＝R i I i +U i Calculating to obtain arbitrary grounding branch, namely the ground potential E of each transformer substation i ，R i Is the grounding resistance of the transformer substation, I i For the actual measured DC bias current of the transformer substation, U i The potential of the node associated with the transformer substation.
7. The utility model provides a earth potential distribution computing system based on electric wire netting direct current magnetic bias current actual measurement which characterized in that includes: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is configured to read executable instructions stored in the computer readable storage medium, and execute the method for calculating the distribution of the ground potential based on actual measurement of the dc bias current of the power grid according to any one of claims 1 to 3.
8. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the ground potential distribution calculation method based on the actual measurement of grid direct current bias current as claimed in any one of claims 1 to 3.
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| CN117113733A (en) * | 2023-10-24 | 2023-11-24 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
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