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초록· 키워드

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In tills paper, the standard Dole, Glover, Khargoneker, and Francis (abbr. : DGKF 1989) H_∞ controller (H_∞C) is extended to the nonlinear feedback linearization-H_∞/sliding mode controller (NFL-H_∞/SMC), to tackle the problem of the unmeasurable state variables as in the conventional SMC, to obtain smooth control as the linearized controller in a linear system, and to improve the time-domain performance under a worst scenario. The proposed controller is obtained by combining the H_∞ estimator with the nonlinear feedback linearization-sliding mode controller (NFL-SMC) and it does not need to measure all the state variables as in the traditional SMC. The proposed controller is applied as a nonlinear power system stabilizer (PSS) for the improvement of the power system damping characteristics of an single machine infinite bus system (SMIBS) connected through a double circuit line. The effectiveness of the proposed controller is verified by nonlinear time-domain simulation in case of a 3-cycle line-to-ground fault and in case of the parameter variations for the AVR gain K_A and for the inertia moment M.

목차

Abstract

Ⅰ. Introduction

Ⅱ. The Preliminary for the NFLC

Ⅲ. The Proposed NFL-H∞/SMC Design

Ⅳ. Nonlinear Power System Model

Ⅴ. Nonlinear Feedback Linearization in a Power System

Ⅵ. Data Analysis

Ⅶ. Nonlinear Time-domain Simulation Test

Ⅷ. Conclusions

References

Appendix

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UCI(KEPA) : I410-ECN-0101-2009-569-017765863