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**Harvard**

Song, Y. och Breitholtz, C. (2017) *VSC-HVDC system robust stability analysis based on a modified mixed small gain and passivity theorem*.

** BibTeX **

@conference{

Song2017,

author={Song, Yujiao and Breitholtz, Claes},

title={VSC-HVDC system robust stability analysis based on a modified mixed small gain and passivity theorem},

booktitle={20th IFAC World Congress on International Federation of Automatic Control},

abstract={In a VSC-HVDC system, when the input power to the converter is controlled to a positive constant, the converter acts a differential negative resistance −P0/i0^2, which may cause instability in case of a connected weak AC-grid. In order to analyze the robust stability of such a system, a modified mixed small gain and passivity theorem is proposed, which shows that
the negative feedback interconnection of two linear time invariant stable subsystems (converter admittance and AC-grid impedance) is input to output stable if in certain frequency bands, both subsystems are passive and at least one of them is strictly passive; at the remaining frequency bands, the loop gain is to be strictly less than one. Under different AC-grid topologies, the
stability sufficient conditions with respect to the AC-grid inductance are studied. It shows that for AC-grid consists of series RgLg-circuit, an introduced series capacitor can improve the system robustness but not for the shunt capacitor.},

year={2017},

keywords={Robust stability of LTI systems, passivity, small gain, VSC-HVDC system, AC-grid interaction, linearized model},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 248331

A1 Song, Yujiao

A1 Breitholtz, Claes

T1 VSC-HVDC system robust stability analysis based on a modified mixed small gain and passivity theorem

YR 2017

T2 20th IFAC World Congress on International Federation of Automatic Control

AB In a VSC-HVDC system, when the input power to the converter is controlled to a positive constant, the converter acts a differential negative resistance −P0/i0^2, which may cause instability in case of a connected weak AC-grid. In order to analyze the robust stability of such a system, a modified mixed small gain and passivity theorem is proposed, which shows that
the negative feedback interconnection of two linear time invariant stable subsystems (converter admittance and AC-grid impedance) is input to output stable if in certain frequency bands, both subsystems are passive and at least one of them is strictly passive; at the remaining frequency bands, the loop gain is to be strictly less than one. Under different AC-grid topologies, the
stability sufficient conditions with respect to the AC-grid inductance are studied. It shows that for AC-grid consists of series RgLg-circuit, an introduced series capacitor can improve the system robustness but not for the shunt capacitor.

LA eng

OL 30