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A Simulation Method of Transformer DC Bias in Areas with Multiple DC Falling Points

A technology of DC bias and DC bias suppression, applied in the field of power system, can solve the problems affecting the safety of transformers, serious and complex DC bias of transformers, and achieve good reliability and execution, comprehensive system and good adaptability. Effect

Active Publication Date: 2016-08-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

For areas with multiple DC drop points, the different combination operation modes of multiple DC circuits make the transformer DC bias problem more serious and complicated, which not only affects the safety of the transformer itself, but also affects the normal operation of the power grid

Method used

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  • A Simulation Method of Transformer DC Bias in Areas with Multiple DC Falling Points
  • A Simulation Method of Transformer DC Bias in Areas with Multiple DC Falling Points
  • A Simulation Method of Transformer DC Bias in Areas with Multiple DC Falling Points

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] According to the actual operation of the power grid in Shanghai and the existing research and monitoring work on the main transformer, the main focus is on the large-capacity transformer with basic load near the DC grounding pole, and the equivalent simplification of the AC system is carried out, as shown in the attached figure 2 As shown, the 4-circuit DC transmission system in the Shanghai area has been retained, namely Xiangjiaba-Shanghai UHVDC, three-shanghai one circuit, three-shanghai two-circuit, and Gezhouba-Nanqiao conventional DC transmission system. The 17 main transformers in 8 substations of Far East, Nanqiao, Tingwei, Jianghai, Muhua, Nongyuan, Hexing and Yinhe, as well as the incoming and outgoing lines of substations, were simulated in detail. According to the actual measurement results of the DC current at the neutral point of each tr...

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Abstract

The invention provides a method for simulating direct current magnetic biasing of a transformer in a multi-direct-current-drop-point region. The method includes the following steps: determining a simulating model of a direct current magnetic biasing current flowing loop, determining whether direct current magnetic biasing restraining measures are required to be taken on the transformer or not according to transformer substation master substation neutral point direct current magnetic biasing current levels and change rules under different combination operating modes of multiple direct currents, determining the direct current magnetic biasing current restraining measures on the transformer, obtaining the optimal direct current magnetic biasing current restraining measures through simulation comparison, and determining parameters of a direct current magnetic biasing current restraining device corresponding to the optimal restraining measures. According to the method for simulating direct current magnetic biasing of the transformer in the multi-direct-current-drop-point region, the complexity of a power grid and a ground access in the multi-direct-current-drop-point region is considered, the transformer direct current magnetic biasing current levels under the different operating modes of the multiple direct currents are given, and therefore the effective method and the technical parameters for restraining direct current magnetic biasing of the transformer are provided.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for simulating DC bias magnetic field of transformers in areas with multiple DC drop points. Background technique [0002] For areas with multiple DC drop points, in order to ensure the safe and stable operation of transformers and systems near the grounding pole, it is necessary to grasp the law of DC current flowing in the power grid and the earth loop and the law of changes with the operating conditions of DC projects. The optimal method for suppressing DC bias magnetic field is put forward in different geological conditions and power grid conditions, and the parameter requirements for the device for suppressing DC bias magnetic field are put forward from the perspective of equipment and system safety. [0003] At present, the research on the DC bias problem of transformers caused by DC transmission is mostly based on the single-circuit DC t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 朱艺颖刘翀王薇薇蒋卫平董鹏胡涛孙栩周俊
Owner STATE GRID CORP OF CHINA
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