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과풍속 영역에서의 약계자 제어를 이용한 풍력발전용 3상 PWM 컨버터의 출력제어
구현근(Hyun-Keun Ku),김재흥(Jae-Heung Kim),이형욱(Hyung-Uk Lee),김장목(Jang-Mok Kim) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.2
This paper proposes the battery charging algorithm for small-scale wind power generator using three phase PWM converter. it is impossible to control output power of the converter in over wind speed region since back EMF of PMSG is higer than battery voltage. Therefore, battery charging algorithm is proposed to expand battery charging over wind speed region. The suggested method is using the q-axis current for battery charging in the rated wind speed region. In the over wind speed region after it lower back EMF of PMSG using d-axis current it can control output power of the converter. The validity of the proposed algorithm are verified by experiments.
전기추진선박의 통합전력계통 시뮬레이션 모델에 관한 연구
구현근(Hyun-Keun Ku),곽기곤(Ki-Kon Kwak),김장목(Jang-Mok Kim) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.1
The simulation model of All-Electric-Ship consists of electrical and mechanical systems. Running the total simulation requires considerable time and causes a lack of computer memory, because the two systems have different dynamic characteristics. Therefore, integrated simulation is practically impossible. This paper proposes the simplified model of electrical system to reduce simulation time significantly, compared to the detailed model. The validity of the proposed simplified model is verified by comparing detailed and simplified simulation results. Thus, the simplified models are applied to the integrated system. As a result, total system simulation can be implemented.
배터리 충전을 위한 소형풍력 발전 시스템의 한계 풍속에 관한 연구
구현근(Hyun-Keun Ku),이형욱(Hyung-Uk Lee),김장목(Jang-Mok Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
Three phase PWM(Pulse Width Modulation) converter of the small-scale wind power system is able to charge battery under the rated wind speed regions. However, it is impossible to control output power of converter at the over win speed region because back-EMF(Electro Motive Force) of PMSG(Permanent Magnet Synchronous Generator) is higher than the battery terminal voltage of PMSG is reduced. However, the cut-off wind speed exists although battery charging algorithm is implemented by flux weakening control method. Therefore, this paper performs analysis of other factors which affects limitation wind speed. The validity of the analysis are verified through simulation.
계통연계형 직렬운전 소형풍력발전시스템의 해석 및 운전방안 연구
김창하(Chang-Ha Kim),구현근(Hyun-Keun Ku),손영득(Yung-Deug Son),김장목(Jang-Mok Kim) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.1
This paper proposes an analysis and operation strategy of a grid-connected wind turbine system using a diode rectifier. The currents of generators are the same as that of a small wind turbine system. Therefore, the analysis of generator torque is required as opposed to an analysis of blade speed. In this paper, the appropriate MPPT control method is proposed to control generator torque. Usefulness of the proposed operation strategy is verified by simulations and experiments.