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Research on Large Scale Transformer Transient Models under Geomagnetically Induced Current in the Power System

Author: PengChenGuang
Tutor: LiuLianGuang
School: North China Electric Power University (Beijing)
Course: Proceedings of the
Keywords: Transformer Geomagnetic induced current DC magnetic bias Excitation current JA theory
CLC: TM406
Type: Master's thesis
Year: 2010
Downloads: 163
Quote: 2
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Abstract


Large geomagnetic induced current transformer and DC project run into the ground monopole current role , the core will produce DC bias magnetic saturation , and initiate transformer magnetizing current distortion reactive power consumption increases and noise, vibration and other secondary phenomenon. In order to accurately analyze GIC under the effect of a large transformer core saturation magnetic bias and a variety of electrical quantities during transient changes , this article uses JA theory, combined with the model and UMEC equivalent electromagnetic transformer equivalent circuit model in MATLAB environment built using the S-function analysis of large transformers for GIC transient model . By closing 500kV transformer at different initial phase angle and the remanence state load switching and transformer magnetizing inrush current when the normal state of the excitation current simulation analysis to verify the correctness of the model . Finally reference 2004 storm intensity , the Northwest Power Grid 750kV transformer magnetizing current role in GIC distortion , reactive power consumption and differential protection were subjected to differential protection level targeted analysis , and the use of power system simulation software PSCAD / EMTDC for the analysis of the results of the proposed model gives the correctness verification.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > General issues > Testing,operation
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