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Y.Banjo,Y. Miura,T. Ise,T. Shintai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In power systems, the engine generator plays an important role such as providing power at the time of power failure and at the stand-alone operating system. In using the engine generator for stand-alone system, there are upper and lower limits in the engine speed variation. As a result, if the engine speed exceeds the value, the engine generator comes to unstable and cannot go on the operation. So when we place a load on engine generator, we have to take the engine speed variation limit into consideration, as a result, the amount of the load come to be limited. In this research, we attempt to reduce the deviation of engine speed during the transient by using the energy storage system (ESS) which is used in the system of inverter control. In this paper, control scheme of ESS is shown and the simulation and experimental result are also shown with comparison between simulation and experiment as a result.
K. Sakimoto,Y. Miura,T. Ise 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The power capacity of distributed generators such as photovoltaic and wind turbine is growing, many of distributed generators are connected to a grid by inverters. The inverters are controlled by a PLL (Phase Locked Loop) in order to be synchronized with power system frequency. Power system will become unstable, if the capacity of inverter-connected-type distributed generators becomes larger and larger, because inverter frequency is controlled to follow the grid frequency. The concept of “Virtual Synchronous Generator” (VSG), which is to control inverters to behave like a synchronous generator, has been proposed. VSG has virtual inertia which is realized by an energy storage device to pretend rotor’s inertia. In this paper, the control scheme of VSG is investigated which is based on the swing equation of a synchronous generator. Numerical simulation results show both ride-through capability of voltage dip and enhancement ability of grid stability.
S. Hata,Y. Miura,T. Ise 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a new family of zero-current-transition (ZCT) power factor correction (PFC) converters is introduced. The proposed converter operates in discrete conduction mode (DCM) and provides soft switching for the main switch and the auxiliary switch with a small inductor and capacitor even in high power / high voltage application. The auxiliary circuit of proposed converter operates for an enough short time compared with the switching period. Furthermore, the auxiliary circuit maintains an almost constant operation time during a power line cycle. As a result, the proposed converter can reduce the losses of the auxiliary circuit. In this study, a steady-state analysis of the proposed converter is described, and features of this converter are compared to ones of zero-voltage-transition (ZVT) converter in theory. These theoretical analyses are verified by a prototype converter.
T. Daido,Y. Miura,T. Ise,Y. Sato 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A doubly-fed induction generator (DFIG), which is one of the variable speed generator, applied to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine cogeneration system. However, the DFIG requires the initial excitation for startup during a blackout because DFIG has no excitation source. In this paper, the excitation method to generate a rated voltage at the primary side during a blackout, which is called “blackout start” has been proposed. In addition, a stand-alone operation following the blackout start has been investigated using both computer simulation and experiments with a gas engine simulator. Moreover, the proposed blackout start and stand-alone operation method has been verified through experiments using a real gas engine.
Radwaste management aspects of the test blanket systems in ITER
van der Laan, J.G.,Canas, D.,Chaudhari, V.,Iseli, M.,Kawamura, Y.,Lee, D.W.,Petit, P.,Pitcher, C.S.,Torcy, D.,Ugolini, D.,Zhang, H. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.109 No.1
Test Blanket Systems (TBS) will be operated in ITER in order to prepare the next steps towards fusion power generation. After the initial operation in H/He plasmas, the introduction of D and T in ITER will mark the transition to nuclear operation. The significant fusion neutron production will give rise to nuclear heating and tritium breeding in the in-vessel part of the TBS. The management of the activated and tritiated structures of the TBS from operation in ITER is described. The TBS specific features like tritium breeding and power conversion at elevated temperatures, and the use of novel materials require a dedicated approach, which could be different to that needed for the other ITER equipment.