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A LRT Control Method Using Sensor Information in Distribution Systems with a Large Amount of PVs and EVs 下载免费PDF全文
YOTARO NOSE TAKAO TSUJI TSUTOMU OYAMA TAKAHARU ITO KATSUYA ABE MASAHIRO MINAMI KAZUNARI ISHIBASHI 《Electrical Engineering in Japan》2017,198(4):51-62
It is of prime importance to maintain voltage profile within the proper range in distribution systems with a large amount of photovoltaics and electric vehicles (EVs). In particular, there is a possibility that line drop compensation (LDC) logic, which is utilized for the control of load ratio tap transformer (LRT) does not work properly when reverse power flow is included partially. Hence, in this paper, we have developed a new LRT control method based on the sensor information supposing that some section switchgears with sensors are introduced in the future distribution systems. Specifically, the extreme value of voltage profile is estimated by convergence calculation in the section between the section switchgear with sensor and LRT. Moreover, the voltage at the end node can be estimated by LDC method using sensor information of section switchgear. The proposed method was tested using a distribution system model and its effectiveness was shown. 相似文献
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TAKAO MUKAI NAOFUMI WATANABE TAKAHIRO TOBA TAKATOSHI ITOH SUSUMU ADACHI 《Journal of food science》1991,56(4):1017-1018
A water soluble polysaccharide “kefiran” produced by Lactobacillus kefiranofaciens was examined for its gel-forming and rheological properties. Kefiran (3%) formed gel in the presence of ethanol (4–10%). The gel strength in 8% ethanol was comparable to that of 3% gelatin gel in water. Addition of casein (3%) increased gel strength 1.5–2.0 fold. The unique properties of kefiran may make it a useful food additive. 相似文献
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Fabrication of particulate reinforced magnesium composites by applying a spontaneous infiltration phenomenon 总被引:3,自引:0,他引:3
A new fabrication method of particulate reinforced magnesium matrix composites using a spontaneous infiltration phenomenon was developed. By mixing infiltration agent powder with reinforcement powder, the magnesium melt spontaneously infiltrated into the powder mixture. In this study, pure magnesium, SiO2 and SiC particle (SiCp, 1.2,2,3,4 and 8 m) powders were used as the matrix metal, infiltration agent and reinforcements, respectively. Experiments to clarify the conditions in which the spontaneous infiltration occurred were carried out under pure argon atmosphere at 973 K. Furthermore, the infiltration velocity was measured. Spontaneous infiltration occurred in the 2,3,4 and 8 m SiCp systems. A minimum SiO2 content necessary for spontaneous infiltration existed and it depended on SiCp diameter. Microstructural observation of the composites revealed that SiCp dispersed homogeneously, even though the diameter of SiCp was fine, and MgO and Mg2Si reaction products were observed. During infiltration, a temperature rise was observed, caused by Mg–SiO2 thermit reaction. Consequently, spontaneous infiltration was caused by improvement of wettability between the magnesium melt and SiCp, which resulted from Mg–SiO2 thermit reaction at the infiltration front. 相似文献
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MASAYUKI KIMURA TAKAO OUCHI HIROSHI NAKAHAMA KEISETSU SHIMA SHUJI SAITO 《International journal of systems science》2013,44(10):2079-2090
A technique is presented for using a learning automaton as a model to simulate and analyse learning behaviour in rats, and the usefulness of this model is illustrated. This automaton was proposed as a learning machine by Tsetlin (1961) and refined by Aso and Kimura (1976). Some learning properties of such an automaton are first examined and it is shown that the automaton can be used to simulate a variety of learning behaviour, composed of several kinds of action, by the proper selection of parameters. Secondly, a mathematical model of the learning experiment carried out in our laboratory with rats is formulated as an interactive system between a learning automaton and its environment. Finally, the effectiveness of the mathematical model is discussed and proved through the simulation and analysis of learning behaviour with multiple actions in a specific rat. 相似文献
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In this paper a procedure is developed for the computation of a state space realization from two dimensional transfer functions with separable denominator. The procedure relies on a canonic form for the state space realization. 相似文献
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Self-propagating high-temperature synthesis of AlN in a graphite crucible in air by mechanical activation 总被引:1,自引:0,他引:1
Powders of Al and C were mixed in a molar ratio of Al :C = 3:1 and were then ground in a planetary ball mill. When the thus
mechanically activated mixtures were transferred into a graphite crucible and exposed to air, they spontaneously ignited and
self-propagating high-temperature synthesis took place in two successive steps. The products were sliced along the depth direction
and examined by X-ray diffraction. Depending on the depth of the crucible, aluminium nitride, aluminium carbide, aluminium
oxynitride, aluminium oxycarbide and alpha alumina were detected. From measurements of the lattice constant, it was found
that aluminium nitride with a 97% purity could be obtained at the bottom of the graphite crucible.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
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本文对采用过二硫酸铵 (NH4) 2 S2 O8法从 Li Mn2 O4中萃取锂离子进行了研究 ,并就所获得吸附剂 (Mn O2 (Li) )的特性 ,特别是对于分离锂同位素的能力进行了测试。在良好的控制条件下 ,(NH4) 2 S2 O8是一种优良的锂吸附剂 ,它具有非常高的锂萃取度 ,同时保持锰的最小溶解性。所制备的 Mn O2 (Li)在 2 5°C时最大的 7Li/ 6Li同位素分离因子为 1 .0 1 4,它是那些商品有机离子交换剂的几倍。 相似文献
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JENG-REN LO YOSHINORI MOCHIZUKI YUJI NAGASHIMA MUNEHIKO TANAKA NAOMICHI ISO TAKESHI TAGUCHI 《Journal of food science》1991,56(4):954-957
Thermal transitions were studied by means of differential scanning calorimetry (DSC) and a spectrophotometric method. Three endothermic peaks (40, 43, 50°C: ordinary muscle; 46, 54, 62°C: dark muscle) were observed in DSC thermograms of both myosins. Thermograms of S-l fragments showed one peak (41°C: ordinary muscle, 43°C: dark muscle). But ordinary and dark muscle rod fragments gave two peaks (41, 62°C) and one peak (58°C), respectively. The spectrophotometric results also showed two thermal transitions for both myosins and one transition for their S-1 fragments. However, the rod from ordinary muscle myosin had two transitions, whereas that from dark muscle myosin had one transition. 相似文献
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Computerized Model for Strain-Stress Analysis of Food Undergoing Simultaneous Heat and Mass Transfer
A computerized method was developed for simulating transient state heat and moisture transfer and stress distribution in axisymmetric food undergoing drying process. For this development, a simultaneous heat and moisture transfer model was coupled with the virtual work principle applicable to a body undergoing volumetric changes. The developed method was verified by comparing experimental results with those predicted. Experimental results were obtained by drying cylindrically formed samples of hydrated starch granules. They included central temperature, average concentration histories and photographically observed internal crack formations. 相似文献