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전류형 인버터의 계통연계형 리액터용량 경감에 관한 연구
김재철,심재명,장석구 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-
Most of present electricity is supplied by nuclear, hydro and fossil power plants. These kind of plants also raise questions about resource, pollution and environment. Alternative energy can gelp answer these questions in the form of naturally occurring ources of energy, such as the sun, the wind, geothermal, heat, biomass and so on. As alternative energy generates the direct electical currents, which should be converted into the alternating currents to be connected to the system, the use of inverter as a power converting circuit is definitely required. There are two types of inverters. The voltage-source inverter is the one and the current source inverter is the other. While the current-source inverter has such a disadvantage as large direct reactor required for constant direct current, it is practically more useful than the voltage-source type to be safe without showing the surge current and dead time in case of both load and inverter short. The interactive generation system for the alternative energy is composed of a PWM chopper and a current-source inverter. There are two methods to reduce the direct reactor increased by the introduction of this current-source inverter. The first method is to insert parallel resonance circuit into the direct current and the second one is to make two times of frequence, to restrain the ripple of the direct reactor current. In this paper, there two methods were compared and evaluated through simulation and experiment. Eventually, it was found that the second method was much better than the first one in terms of restraining of the ripple of the direct reactor current as well as reduction of the reactor by half.
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