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Vol. 170, Issue 5, May 2014, pp. 241-247




Research on Harmonic Features of High-Power Doubly-fed Hydro-generator

1 Duanzeng LIU, 2 Shuqi LIU, 3 Shuye DING, 4 Ning Zhang

Institute of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080, China
1 Tel.: 13946077827

1 E-mail: Liuduanzeng@163.com


Received: 9 January 2014 /Accepted: 30 April 2014 /Published: 31 May 2014

Digital Sensors and Sensor Sysstems


Abstract: In order to accurately calculate the generator loss, point out the distribution of generator loss and reveal the effect of harmonic magnetic field and other factors to generator loss. In this paper, a 6.5 MW doubly-fed hydro-generator was taken as an example. Time– stepping finite element method was adopted for the numerical simulation of electromagnetic field in generator, and Matlab was used for the Fourier analysis of electromagnetic field in the generator. This paper gave the distribution characteristics of generator loss in different structures, and pointed out the key factor of affecting generator loss. Based on the numerical study results, the generator electromagnetic fields were compared and analyzed when generator used skewed slot, magnetic slot wedge and both skewed slot and magnetic slot wedge. The result that both skewed slot and magnetic slot wedge structure has most benefit to the generator was got.


Keywords: Doubly-fed hydro-generator, Time-stepping finite element, Iron loss, Harmonic analysis, Structure optimization.


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