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시간 지연 선형 파라메타 변형 시스템의 안정화 조건에 관한 연구
정창기(Changki Jeong),강병훈(Byunghoon Kang),고정완(Jeong Wan Ko),박부경(PooGyeon Park) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
In this paper, a delay-dependent stability criterion for time-delayed linear parameter varying (LPV) systems is considered. Stability criterion has been developed on the basis of including x (t), x(t-h) and x(t) and introducing free variables to eliminate model dynamics. Since the resultant criterion is formed parameterized linear matrix inequalities (PLMIs). we propose a relaxation technique that allows to find an LMI formulation. Examples demonstrate the efficiency of the criterion over the existing results.
최인규(Inkyu Choi),정창기(Changki Jeong),김병철(Byoungchul Kim),김종안(Jongan Kim),우주희(Joohee Woo) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The thermal energy from nuclear fission is transferred to the steam generator which is a kind of a large heat exchanger. After the feedwater is injected into the steam generator and absorbs the thermal energy, it is converted into the steam. This steam goes into the turbine. The balance between the generated energy and the consumed energy is required for the nuclear power plant to be stable. For the purpose of which, the feed water, a parameter for energy transfer, should be controlled in stability. Usually, the nuclear power plants are operated in base load in the view of power system for the stability of fission system. Therefore, though there will be almost no unbalance, there can be some instability from unbalance in case of startup/shutdown or disturbance. In this case, the controllability of feed water pump is very important for the quick recover of stability.