INVESTIGATION ON NEGATIVE-RESISTANCE EFFECT OF DOUBLY-FED INDUCTION GENERATOR

Xing Facai; Xu Zheng

doi:10.19912/j.0254-0096.tynxb.2020-0730

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (4) : 324-332. DOI: 10.19912/j.0254-0096.tynxb.2020-0730

Topics on Key Technologies for Safety of Electrochemical Energy Storage Systems and Echelon Utilization of Decommissioned Power Batteries

INVESTIGATION ON NEGATIVE-RESISTANCE EFFECT OF DOUBLY-FED INDUCTION GENERATOR

Xing Facai, Xu Zheng

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Abstract

For the oscillations risk assessment of the double-fed induction generator （DFIG） transmitted by the series-compensated grid, the negative-resistance effect of the DFIG is specially investigated in this paper. Firstly, based on the common control structure, the port-admittance model of the DFIG is established by analyzing its response characteristics to disturbances. On the basis, the equivalent rotor impedance of asynchronous generator is derived based on the equivalent electrical circuit analysis. Subsequently, the negative-resistance characteristics of the rotor circuit are further investigated and two characteristic indexes are defined to evaluate the oscillations risk. Finally, the accuracy of the port-admittance model and the effectiveness of the characteristic indexes are verified through the time-domain electro-magnetic transient simulation. From case studies, it indicates that the negative-resistance effect of the DFIG mainly depends on the rotor circuit of asynchronous generator. It is influenced by the rotating speed of the generator, the resistance of the rotor windings, and the controller parameters of the rotor-side converter.

Key words

DFIG / electric power system stability / stability criteria / electric impedance / negative resistance

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Xing Facai, Xu Zheng. INVESTIGATION ON NEGATIVE-RESISTANCE EFFECT OF DOUBLY-FED INDUCTION GENERATOR[J]. Acta Energiae Solaris Sinica. 2022, 43(4): 324-332 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0730

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