NDLI: Calculation method of winding eddy-current losses for high-voltage direct current converter transformers

Content Provider	IET Digital Library
Author	Liu, Yaqing Zhang, Dandan Li, Zhenbiao Huang, Qinqing Li, Bin Li, Menghu Liu, Jian
Abstract	In this paper, a correction method is introduced to make a more accurate calculation of winding eddy-current losses of high-voltage direct current (HVDC) converter transformer. The assumption that winding eddy-current losses of HVDC converter transformers follow the frequency with the exponent 2 proposed by IEC 61378-2 Std. is thought to be inappropriate and the skin effect should be taken into consideration. The frequency characteristic of winding eddy-current losses is proposed by analysing the distribution of magnetic flux in conductors, in which skin effect is taken into consideration. The correction method with a correction factor is then introduced to correct the assumption. To verify the validity of the correction method, a two-dimension axisymmetric finite element analysis of a HVDC converter transformer is conducted. The geometrical complexity of windings and electrical connection are fully taken into account, it is shown that the correction method shows a significant advantage. Influence of different methods is revealed by applying the actual non-sinusoidal load current and it is shown that the error of correction method is the least. At last, harmonic losses measurements are conducted on three coils to investigate the limits of the correction method.
Starting Page	488
Ending Page	497
Page Count	10
ISSN	17518660
Volume Number	10
e-ISSN	17518679
Issue Number	Issue 6, Jul (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/10/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2015.0559
Journal	IET Electric Power Applications
Publisher Date	2016-07-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Correction Factor Eddy Current Loss Electrical Connection Finite Element Analysis Geometrical Complexity Harmonic Loss Measurement High-voltage Direct Current Converter Transformer HVDC Converter Transformer HVDC Power Converter IEC 61378-2 Std IEC Standards Magnetic Flux Transformer And Reactors Transformer Windings Two-dimension Axisymmetric Finite Element Analysis Winding Eddy-current Loss Windings
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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