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The use of photovoltaics (PV) has increased in some small islands of Okinawa Prefecture, Japan in response to various renewable energy demonstration projects. Since this increased usage could deteriorate the power quality, including frequency, of an isolated grid in a small island, a frequencystabilizing system using lithium-ion capacitors (LiC) has been integrated into the grid. Because a frequency-stabilizing...
Electric Double Layer Capacitor (EDLC) is used as an electric energy storage device because it has large capacity. In the energy storage system composed of series-connected EDLCs, each cell has a different voltage because of the individual characteristic and of repeating charge and discharge. This difference of voltages deteriorates the performance of the whole storage system. In this paper, a novel...
Summary form only given. This paper proposes applying the 2-stage diagonally implicit Runge-Kutta (2S-DIRK) method of numerical integration to the calculation of electromagnetic transients (EMTs) in a power system. The accuracy and the numerical stability of 2S-DIRK are almost the same as those of the trapezoidal method, while 2S-DIRK does not produce sustained numerical oscillation due to a sudden...
This paper proposes applying the two-stage diagonally implicit Runge-Kutta (2S-DIRK) method of numerical integration to the calculation of electromagnetic transients (EMTs) in a power system. The accuracy and the numerical stability of 2S-DIRK are almost the same as those of the trapezoidal method, while 2S-DIRK does not produce sustained numerical oscillation due to a sudden change of an inductor...
A partial-resonant tapped-inductor converter with an auxiliary switch is proposed. The circuit construction is the same as a conventional tapped-inductor converter with active clamp circuit, but the drive timing for the auxiliary switch is different from the conventional one. As a result the output stability is improved as compared with the conventional active clamp one. Furthermore, zero current...
A small size DC-DC regulated converter which does not include inductance is descrived. Voltage transformation is achieved by switched capacitors, that is charging capacitors in series and discharging them in parallel or charging them in parallel and discharging them in series. In the case of inverting the polarity of output voltage, the capacitors are connected to the load as the polarity is inverted...
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