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김종겸 대한전기학회 2020 전기학회논문지 P Vol.69 No.2
Pumped-storage power generation is a method of generating by pumping the water at the upper reservoir by using surplus power at the late night and then discharging the water when power use is increased suddenly. Most of the generators used for pumped generation have used synchronous generators. Synchronous generators are more advantageous than induction generators, but they are disadvantageous in terms of maintenance and price. Up to now, pumped storage power generation has been mainly in large capacity, but recently, as requirements for renewable energy have increased, the class of small and medium capacity is required. If the output of the generator is not large, it may be more economical to apply the induction generator than the synchronous generator. In this research, various phenomena that may occur when induction generator is applied to fish farm pumped-storage power generation where output is not large are analyzed.
이중 농형 유도전동기의 등가회로도 파라미터에 관한 연구
김종겸,이동주 대한전기학회 2024 전기학회논문지 Vol.73 No.3
The squirrel cage induction motors are most often used for driving rotating loads in industrial fields with high efficiency and have the disadvantage of high starting current during initial startup. Hence, the double squirrel cage induction motors are used to reduce high starting current and obtain high torque during startup. It is very difficult to obtain the transient or steady state characteristics under the actual load condition using the parameters on the manufacturer’s nameplate because the most of induction motors are operated with less than rated output load and the parameters are given at the conditions of the rated output. In this paper, the calculation method of the parameters in the equivalent circuit diagram of double squirrel cage induction motor is presented and the transient and steady state characteristics of the three induction motors are analyzed using the parameters and electromagnetic transients program to verify the presented calculation method.
김종겸,박영진,Kim, Jong-Gyeoum,Park, Young-Jeen 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.6
대부분의 저압 수용가는 단상 및 3상 부하를 동시에 공급할 수 있는 장점을 지닌 3상 4선식 배전시스템을 적용하고 있다. 이 시스템은 구조적인 간단함 때문에 종래의 단상 및 3상 부하를 분리하는 방식보다 편리하다. 그러나 고르지 못한 부하 불평형이나 낮은 전기품질은 출력저하나 손실과 같은 문제를 발생하고 있다. 본 논문에서는 실제현장에서 전압 및 전류 파형을 측정하여 국제적으로 허용되고 있는 전압불평형 기준과 비교 분석을 실시하였다. Most of LV customer have applied the 3-phase four wire system distribution system because it has advantage of supplying both of 1-phase at 3-phase loads simultaneously. Due to its structural simplicity, it is more convenient for use rather than the conventional separated scheme. But once in a while uneven load unbalance or unclean power quality lead some problems such as do-rating or power losses. In this paper, voltage and current waveform in the actual fields have been measured and analyzed in relation with intermationally allowable voltage unbalance limits.