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Robust wide‐area damping controller design for inter‐area oscillations with signals' delay
Author(s) -
Liu Fang,
Li Yong,
Wu Min,
Zhou Yicheng,
Yokoyama Ryuichi
Publication year - 2016
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22208
Subject(s) - control theory (sociology) , benchmark (surveying) , weighting , controller (irrigation) , electric power system , flexible ac transmission system , compensation (psychology) , stability (learning theory) , linear matrix inequality , convex optimization , computer science , signal (programming language) , power (physics) , engineering , mathematics , control (management) , regular polygon , mathematical optimization , artificial intelligence , psychoanalysis , power flow , biology , psychology , geometry , geodesy , quantum mechanics , machine learning , agronomy , radiology , programming language , medicine , physics , geography
A new wide‐area damping control strategy is investigated for flexible AC transmission systems (FACTS) device using wide‐area measurement system (WAMS) signals. The purpose is to design a dynamic output wide‐area damping controller (WADC) for improving the stability of interconnected power systems. The time‐varying delay of wide‐area signal is incorporated into the design process, which can effectively reduce the delay effect on the damping performance. First, a discrete‐time plant model with time‐varying delay is established for power systems; then by using the proposed improved free‐weighting matrices (IFWMs) approach and a convex optimization algorithm, a new and less conservative delay‐dependent stability criterion, expressed in the terms of linear matrix inequalities (LMIs), is obtained without ignoring any useful terms on the difference of a Lyapunov function. Detailed case studies on a 4‐machine two‐area benchmark test system and 16‐machine five‐area NETS‐NYPS interconnected system show that the designed WADC can not only maintain effective damping performance under the condition of time‐varying delay but also get the maximum wide‐area time delay. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.