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Optimization method for governing geomagnetic storm power grid disasters by adopting small resistance

A technology for power grid disasters and optimization methods, applied in electrical components, circuit devices, data processing applications, etc., can solve problems such as threats to the safe operation of power grids and damage to transformers

Pending Publication Date: 2021-04-13
STATE GRID EAST INNER MONGOLIA ELECTRIC POWER CO LTD MAINTENANCE BRANCH +1
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Problems solved by technology

Larger 0.0001-0.01Hz GIC flowing through the transformer will cause the DC bias magnetic saturation of the transformer iron core, and the harmful interference such as harmonics and reactive power loss secondary to the saturation of the transformer iron core may damage the transformer, thereby threatening the safe operation of the power grid

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  • Optimization method for governing geomagnetic storm power grid disasters by adopting small resistance
  • Optimization method for governing geomagnetic storm power grid disasters by adopting small resistance
  • Optimization method for governing geomagnetic storm power grid disasters by adopting small resistance

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Embodiment Construction

[0082] The present invention proposes an optimization method for controlling geomagnetic storm power grid disasters by using a small resistance. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0083] The 4-node equivalent circuit of the governance grid GIC is as follows figure 1 shown. u ij (i,j=1,2,3,4) is equivalent to the DC voltage source of the line, R ij (i,j=1,2,3,4) is the equivalent DC resistance of the line, R gi (i,j=1,2,3,4) is the equivalent DC resistance of grounding resistance and transformer winding, R ssi (i,j=1,2,3,4) is the GIC control resistor connected in series with the neutral point of the transformer, in practice figure 1 Scalable to n nodes.

[0084] Considering the uncertain characteristics of geomagnetic storm geoelectric field direction and international common regulations, the maximum value of neutral point GIC and the 1-minute average maximum value of transformers...

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Abstract

The invention discloses an optimization method for governing geomagnetic storm power grid disasters by adopting small resistance, which belongs to the field of power grid safety and disaster prevention and control. The method mainly comprises four aspects of power grid GIC theoretical calculation, construction of a GIC governance optimization model, a target function and constraint conditions, optimization calculation by adopting an improved NSGA-II algorithm, and obtaining of an optimization scheme through fuzzy membership evaluation. The four technologies coordinate with one another, effective regulation and control over the power grid GIC and voltage fluctuation are achieved, the reliability of power grid operation and the economical efficiency of governance can be improved, and great significance is achieved for GIC governance in China.

Description

technical field [0001] The invention relates to the field of power grid safety and disaster prevention and control, in particular to an optimization method for controlling geomagnetic storm power grid disasters by using small resistance. Background technique [0002] The geomagnetic storm generated by the impact of the solar wind on the earth has caused the power grid blackout in Quebec and a large number of transformer damage accidents in Northern Europe, North America and South Africa. Among them, the high magnetic latitude areas of northern Europe and North America are more seriously affected by the geomagnetic storm due to relatively large geomagnetic disturbance. Geomagnetic storms generate a large geomagnetic induced current (GIC) in the 230kV power grid. The control of GIC at the neutral point of the transformer not only requires huge investment, but also changes the distribution of GIC in the power grid and generates new high-risk sites for GIC accidents, so it is no...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06Q10/04G06Q50/06
CPCH02J3/00G06Q10/04G06Q50/06H02J2203/10H02J2203/20Y04S10/50Y02E40/70
Inventor 李海明孟辉刘斌范胜国袁晓磊张海龙梁建石海鹏刘文琳
Owner STATE GRID EAST INNER MONGOLIA ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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