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		Rongxiang YUAN,Yang RUAN,Po HU.[en_title][J].Control Theory and Technology,2012,10(4):554~558.[Copy]

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RongxiangYUAN,YangRUAN,PoHU
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(School of Electrical Engineering, Wuhan University)

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Received:July 15, 2010Revised:March 29, 2011

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Nonlinear excitation controller design for power systems: an I&I approach

Rongxiang YUAN,Yang RUAN,Po HU

(School of Electrical Engineering, Wuhan University)

Abstract:

The Immersion and Invariance (I&I) methodology provides a novel approach for nonlinear system control, which is distinct from the traditional feedback linearization and backstepping method. In this paper, a new excitation controller is designed for single machine infinite bus system (SMIBS) based on the I&I approach. Firstly the dynamic model of SMIBS is homeomorphously transformed to a specific form for which a stable lower-order target system is selected. Then the I&I excitation controller is designed by immersing the transformed system into the target system. Simulation results from PSCAD/EMTDC demonstrate that the proposed controller guarantees transient stability of the system after large disturbances.

Key words: Power systems Excitation control Nonlinear control Immersion and invariance