Theoretical and Simulation Study on Resistance Variations of Brush and Slip Ring of a Double-Fed Induction Generator

doi:10.11930/j.issn.1004-9649.2013.12.83.6

Abstract

Abstract: Good electrical contact between the brush and slip ring is the precondition for stable operation of a double-fed induction generator (DFIG). The brush and slip ring resistance is therefore an important indicator for evaluating the reliability of the electrical contact system. By taking a DFIG of 1.5 MW for case study, a quantitative analysis and calculation of the working resistance of the brush and slip ring is conducted with consideration of the cyclical change of the slip ring resistance. By using PSCAD/EMTDC simulation software, the numerical model and circuit model of the brush and slip ring dynamic resistance are established respectively under normal and fault working conditions, and a theoretical analysis of brush current interharmonic is carried out. Through comparing and analyzing the brush current before and after the fault condition based on the FFT transformation, it is concluded that the decreasing rate of the brush current interharmonic component is far smaller than that of the fundamental component before and after fault condition, and the THD of fault condition is much larger than that of the normal condition. This conclusion can provide a guidance for condition monitoring and fault diagnosis of the brush and slip ring system and acts as an available criterion for the operation stability of the system.

Key words: double-fed induction generator (DFIG), brush, slip ring, contact resistance, brush current, fault diagnosis

CLC Number:

TM343

CHEN Tao-tao, MA Hong-zhong. Theoretical and Simulation Study on Resistance Variations of Brush and Slip Ring of a Double-Fed Induction Generator[J]. Electric Power, 2013, 46(12): 83-89.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.12.83.6

https://www.electricpower.com.cn/EN/Y2013/V46/I12/83

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