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위상시프트 제어법을 적용한 공진형 스위치드 커패시터 DC-DC 컨버터의 특성
우경일,유우창,유의정,문상필 대한전기학회 2022 전기학회논문지 P Vol.71 No.3
This paper deals with a transient characteristics improvement of a resonant switched capacitor converter(RSCC)based on phase shift control method, which has capability of accurate voltage regulation by means of applying a voltage feedback control. The analysis in this paper reveals that the RSCC may superpose an unwanted current on the resonant current and cause voltage fluctuation and/or over current in a transient state. This paper proposes a modified phase shift control method including the sequence and timing control of the gate signals, resulting in elimination of the unwanted current from the resonant current. Experimental results verify the validity of the proposed control method.
재생에너지와 연계된 배터리 에너지저장시스템(BESS) 설계 및 충방전 운영효율 특성에 관한 연구
우경일,장용해,최요순 국제차세대융합기술학회 2020 차세대융합기술학회논문지 Vol.4 No.1
세계 각국의 경제발전과 생활수준의 향상으로 인해 전력수요는 매년 증가하고 있으며 지구환경 문제 및 유가불안정 문제에 대비하기 위해 신재생에너지의 중요성이 날로 부각되고 있다. 또한 시간대별로 변화하는 전력 에너지 수요에 대응하기 위해, 신재생에너지를 이용하여 생산된 전력을 배터리 등의 에너지저장시스템에 저장하였 다가 수요피크 시간대에 저장된 에너지를 방전하는 기술이 보편적으로 활용되고 있다. 신재생에너지와 연계된 에 너지저장시스템을 경제적이고 효율성 있게 구성하기 위해서는 신재생에너지를 통해 생산가능한 발전량과 에너지저 장시스템의 이용효율에 대한 정확한 예측이 필요하다. 본 논문에서는 태양광발전으로부터 생산된 전기에너지를 활 용하여 배터리에너지저장시스템을 통해 전력그리드로 송전하는 시스템의 최적 설비용량 산정과 배터리 충방전시의 효율분석에 대하여 연구하였다. As the need for clean and environment-friendly renewable energy increases, it does matter how to meet the electric power demands in electric power system. As for this subject, it should be considered to employ and utilize BESS to make the most use of photovoltaic energy, which has very changeable power capacity during the day. This paper shows how to design BESS and apply it to the current photovoltaic power plants.
Winding Function 이론을 이용한 동기형 릴럭턴스 전동기 토크 특성 해석
우경일(Kyung-il Woo),박상훈(Sang-hoon Park),박한석(Han-seok Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this paper, torque characteristics analysis of synchronous reluctance motor(SynRM) with the cylindrical rotor type by Winding Function Theory(WFT) is described. The stator is same as one of the induction motor. To calculate self and mutual inductances of the machine by using winding function theory the new equivalent geometry of rotor was proposed. D-axis, q-axis flux densities and torque characteristics were obtained. From the comparison with results of Finite Element Analysis(FEA) the proposed method was verified.
전동기와 드라이브의 국제 규격 및 규제에 관한 현황 연구
우경일(Kyung-Il Woo),박한석(Han-Seok Park),김대경(Dea-Kyong Kim),최한석(Han-Seok Choi),전희득(Hee-Deuk Jun) 대한전기학회 2014 전기학회논문지 Vol.63 No.3
Electric motors and drives consume the largest amount of electricity more than 40% of global electricity consumption. In addition, motors, drives and its components are included in the global high-trade products and the main driving source for industrial equipment and house appliances. Thus, International standards and regulations for their safety and efficiency are internationally being discussed and created for the protection of its citizens and energy saving. So, understanding the international standards and the regulation of each country is essential to enhance overseas market and to develop product. In this paper, on the basis of this background, status and trends of international standards and regulations are introduced for safety and efficiency of motors and the drives. Safety and efficiency of the IEC (International Electrotechical Commission) standards are introduced in the emphasis. Also, regulations are studied about the differences and trends in each county.