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Modeling and evaluating method for geomagnetically induced current of high-voltage power grid

A technology of geomagnetic induction current and high-voltage power grid, applied in the field of power system, can solve problems such as vibration noise, harmonics and reactive power loss GIC-Q interference, power grid influence, and low tolerance

Pending Publication Date: 2022-08-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, UHV transformers generally adopt the structure of three single-phase transformer groups. It has been proved by research that the resistance of group-structured transformers to GIC is lower than that of three-phase three-column or three-phase five-column transformers. Under the action of GIC, the secondary interference such as vibration noise, harmonics and reactive power loss GIC-Q will be greater, and the failure of the UHV power grid will have a major impact on the entire power grid in my country

Method used

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  • Modeling and evaluating method for geomagnetically induced current of high-voltage power grid
  • Modeling and evaluating method for geomagnetically induced current of high-voltage power grid
  • Modeling and evaluating method for geomagnetically induced current of high-voltage power grid

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Embodiment 1

[0039] figure 1 A schematic flowchart of a method for modeling and evaluating a geomagnetically induced current in a high-voltage power grid provided by an embodiment of the present invention. According to the generation mechanism of power grid GIC, the calculation of power grid GIC can be divided into two steps: one is that the magnetospheric and ionospheric currents induce a time-varying electromagnetic field, and the magnetic field data is observed and recorded by the geomagnetic station to calculate the induced geoelectric field; The electric field acts on the power grid through the ground point to generate GIC, and the ground induced electric field is equivalent to the power supply in the network, and an equivalent circuit model is established according to the power grid parameters, so as to realize the calculation of the ground electric field.

[0040] refer to figure 1 , the modeling and evaluation methods of geomagnetically induced current in high-voltage power grids ...

Embodiment 2

[0057] In order to better verify the method provided by the present invention, the present embodiment uses the GIC monitoring data of the transformer of a certain station flowing through the neutral point of the transformer during the magnetic storm on November 09-10, 2004 to perform relevant verification calculations. image 3 It is a 500kV power grid distribution structure of a power grid. The power grid contains 54 nodes and 62 lines. Since some circuits are equipped with capacitor series compensation, the flow path of GIC is cut off and can be treated as a boundary point. The transmission line of the 500kV power grid adopts 4-split conductors, and the resistance per unit length is much smaller than that of the 220kV line, and the 500kV line is longer than the 220kV line. Therefore, in the GIC calculation in the embodiment of the present invention, the influence of the low-voltage line on the 500kV power grid is ignored. The grid nodes and line parameters are not repeated h...

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Abstract

The invention discloses a high-voltage power grid geomagnetically induced current modeling and evaluating method. The method comprises the following steps: measuring each element of a geomagnetic field by using an absolute observation method and a relative observation method; processing terrestrial magnetism data differences by utilizing a terrestrial magnetism data interpolation method; and calculating an induction ground electric field based on a plane wave method, constructing an equivalent circuit model of the GIC, and calculating the power grid GIC according to the equivalent circuit model of the GIC. Compared with the prior art, the method is combined with the actual electrical structure of the ground in China, the problem of evaluating the ground electric field and the GIC in the high-voltage power grid is solved, the calculation accuracy is high, the reliability is high, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for modeling and evaluating geomagnetically induced currents of high-voltage power grids. Background technique [0002] The impact of the solar wind on the earth's magnetic field causes magnetic storm disasters and induces electromotive force on the earth's surface. The electromotive force acts on the power grid, and generates geomagnetically induced currents (GIC) in the loop formed by the transmission line, the ground, the transformer and the grounded neutral point. The GIC generated in the power grid leads to saturation of the transformer core, reactive power loss, harmonics and vibration temperature rise effects, which eventually lead to the occurrence of successive failures of the power system, affecting the safe and stable operation of the system, and sometimes even causing large-scale power outages. [0003] my country's rapid economic growth and uneven dis...

Claims

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Application Information

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IPC IPC(8): G06F30/367H02J3/00
CPCG06F30/367H02J3/00H02J2203/20Y02E60/00
Inventor 陈赞铭
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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