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As a distributed generation system increases, a stable power supply becomes difficult. Thus control of power leveling (PL) unit is required to maintain the balance of power flow for irregular power generation. The unit is required to respond to change of voltage and bidirectional power flow. So the bidirectional buck/boost DC/DC converter is applied for the control of PL unit in this research. The...
Ni-nanowire array films were prepared by general galvanostatic electrodeposition employing a polycarbonate membrane filter (pore diameter: 0.1 µm or 0.8 µm) as a template and subsequent dissolution of the membrane filter in chloroform. Thereafter the Ni-nanowire array films were modified with Sn by pulsed electrodeposition. Morphology of Sn-modified Ni-nanowire array films obtained was largely dependent...
Development of Hall thrusters for nano, small and low-power satellites below 100W is expected. In lowering Hall thruster power, the cylindrical-type Hall thruster is more advantage than conventional coaxial-type Hall thrusters. In this study, a very low power cylindrical Hall thruster was designed, and the thruster performance was measured. As a result, a stable operation was achieved even with 10W...
A microwave discharge ion thruster of 5cm size was fabricated and its next concept improved in plasma ignition and sustention was reported. As we have already developed 10cm and 2cm size microwave discharge type ion thrusters, the development of 5cm one on the basis of the previous ones is carried out. It is sometimes difficult to generate plasma in it. Several magnetic configurations in the discharge...
Photovoltaic (PV) systems are rapidly gaining acceptance as some of the best alternative energy sources. In installation area of large PV/battery system, it requires appropriate operation for example of a method considering power output fluctuation and insolation forecasts errors. In addition, it is better to minimize the size of battery and its capital cost. This paper proposes an optimization approach...
High-power and high-specific-impulse characteristics of Hall thrusters were experimentally studied. Input power and specific impulse reached above 5 kW and 3000 sec, respectively. As a result, the specific impulse and the thrust efficiency were 3202 sec and 61 %, respectively, with 2.8 kW. Discharge current oscillation also increased by raising discharge voltage.
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