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Study of Generator Control with H-Infinity Control Considering Distributed Generator
K. Yukita,G.Fukuyama,T.Hosoe,T.Matsumura,Y.Goto 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper describes a frequency control using of small-scale power systems is investigated. Utility grids are affected by load and photovoltaic generation fluctuations, which could result in frequency and voltage changes, thereby deteriorating the power quality. Therefore, it is necessary to suppress the effects of these fluctuations on the utility grids. To control a utility grid, we used the conventional proportional-integral controller and a Hinfinity controller, which is one of the recent control methods. Then, we compared and studied both the controls. From the results, it is confirmed that by using the H-infinity control device the frequency fluctuation of power systems can be suppressed when the load fluctuates.
Thermometry for Dirac Fermions in Graphene
Fan-Hung Liu,Chang-Shun Hsu,Shun-Tsung Lo,Chiashain Chuang,Lung-I Huang,Tak-Pong Woo,Chi-Te Liang,Y. Fukuyama,Y. Yang,R. E. Elmquist,Pengjie Wang,Xi Lin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
We use both the zero-magnetic-field resistivity and the phase coherence time determined by weaklocalization as independent thermometers for Dirac fermions (DF) in multilayer graphene. In thehigh current (I) region, there exists a simple power law TDF / I0.5, where TDF is the effective Diracfermion temperature for epitaxial graphene on SiC. In contrast, TDF / I1 in exfoliated multilayergraphene. We discuss possible reasons for the different power laws observed in these multilayergraphene systems. Our experimental results on DF-phonon scattering may find applications ingraphene-based nanoelectronics.