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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.
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.
Distribution Voltage Control for DC Microgrid with Fuzzy Control and Gain-Scheduling Control
H. Kakigano,A. Nishino,T. Ise 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
DC microgrid is an appropriate system to interconnect kinds of dc output sources and to supply high quality power. In this presentation, we show a novel dc distribution voltage control by several dc/dc converters for energy storages considering the stored energies. In an assumed system, electric double layer capacitors (EDLC) are connected to a dc grid by dc/dc converters, and each EDLC converter controls the dc distribution voltage when the system is operated under intentional islanding mode. In the past research, several papers already proposed dc distribution voltage controls, and most of them adopted droop controls. We proposed a new voltage control that combines fuzzy control to gain-scheduling control in order to manage the stored energies. The simulation and experimental results show that the dc distribution voltages were within 340 V ± 5 %, and the ratio of stored energy is approximated equal. It means that dc voltage regulation control and stored energy balancing control can be realized simultaneously by the proposed control.
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.