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Parallel Multiple Electric Power Conversion System Constructed by Connecting Three Power Converters
Nakai, Mitsuki,Inaba, Hiromi,Kishine, Keiji,Ishikura, Keisuke Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
The electric power conversion system constructed by connecting two or more power converters in parallel is an advantageous method for making to large capacity and standardization. In this paper, the control method of cross current when three power converters are operated is examined, and it reexamined a preferable system construction method.
Ito, Takuma,Inaba, Hiromi,Kishine, Keiji,Nakai, Mitsuki,Ishikura, Keisuke Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.4
If it were possible to control four sets of PMSMs in place of induction motors by using one inverter, we could attain efficient driving trains. In this paper, a method for controlling three sets of PMSMs with one inverter is shown. Additionally, this shows the method to control four sets of PMSMs with one inverter and the results of a simulation with the proposed method.
(Susumu Okabe),(Kuniharu Matsuno),(Hiromi Nakai),(Kikuko Amagase) 대한소화기학회 1999 SIDDS Vol.5 No.-
Oral administration of beer and peptone meal is known to stimulate gastric acid secretion in vagally-innervated and denervated dogs, most probably by inducing an increased gastrin release. To confirm the role of circulating gastrin, it was examined whether or not YM022 (a CK-B/gastrin-receptor antagonist) and cimetidine inhibit the gastric acid secretion stimulated by beer, peptone and peptone-beer in denervated Heidenhain pouch dogs. Both YM022 and cimetidine markedly inhibited the gastric acid secretion stimulated by the above three secretagogues. The underlying mechanism for acid inhibition by YM022 appears to involve CCK-B/gastrin receptors in both parietal cells and ECL cells. In the case of cimetidine, the mechanism underlying acid inhibition appears to involve the direct action on histamine H2-receptors in parietal cells.
Method Controlling Two or More Sets of PMSM by One Inverter on a Railway Vehicle
Ito, Takuma,Inaba, Hiromi,Kishine, Keiji,Nakai, Mitsuki,Ishikura, Keisuke Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.2
If two or more Permanent Magnet Synchronous Motors (PMSM) can be controlled by one inverter, a train can be driven by less energy than the present Induction Motor (IM) drive system. First, this paper proposes a method for simulating the movement of wheels and a vehicle to develop a control method. Next, a method is presented for controlling two or more PMSMs by one inverter.
Ishikura, Keisuke,Inaba, Hiromi,Kishine, Keiji,Nakai, Mitsuki,Ito, Takuma Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
A large capacity power conversion system constructed by using two or more existing power converters has a lot of flexibility in how the power converters are used. However, at the same time, it has a problem of cross current flows between power converters. The cross current must be suppressed by controlling the system while miniaturizing the combination reactor. This paper focuses on two current control methods of a power conversion system constructed by using two power converters connected in parallel supplying the same power. In order to elucidate the control performance of cross current, each control method which are aimed at controlling cross current and not directly controlling it are examined in simulations.
Ishikura, Keisuke,Inaba, Hiromi,Kishine, Keiji,Nakai, Mitsuki,Ito, Takuma Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.4
Parallel operation systems have an advantage in that they can be constructed quickly and inexpensively by combining existing electric power converters. However, in this case, there is a peculiar problem in that a cross current flows between the electric power converters. To design a control system more simply and commonalize the core of combination reactors, we reviewed a system construction method for parallel operation systems constructed with three electric power converters.
Cho, Daeheum,Ko, Kyoung Chul,Ikabata, Yasuhiro,Wakayama, Kazufumi,Yoshikawa, Takeshi,Nakai, Hiromi,Lee, Jin Yong American Institute of Physics 2015 The Journal of chemical physics Vol.142 No.2
<P>The intramolecular magnetic coupling constant (J) of diradical systems linked with five- or six-membered aromatic rings was calculated to obtain the scaling factor (experimental J/calculated J ratio) for various density functional theory (DFT) functionals. Scaling factors of group A (PBE, TPSSh, B3LYP, B97-1, X3LYP, PBE0, and BH&HLYP) and B (M06-L, M06, M06-2X, and M06-HF) were shown to decrease as the amount of Hartree-Fock exact exchange (HFx) increases, in other words, overestimation of calculated J becomes more severe as the HFx increases. We further investigated the effect of HFx fraction of DFT functional on J value, spin contamination, and spin density distributions by comparing the B3LYP analogues containing different amount of HFx. It was revealed that spin contamination and spin densities at each atom increases as the HFx increases. Above all, newly developed BLYP-5 functional, which has 5% of HFx, was found to have the scaling factor of 1.029, indicating that calculated J values are very close to that of experimental values without scaling. BLYP-5 has potential to be utilized for accurate evaluation of intramolecular magnetic coupling constant (J) of diradicals linked by five- or six-membered aromatic ring couplers.</P>