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22.9㎸ 배전선로 적용을 위한 DVR의 새로운 외란검출 기법 및 제어시스템 설계
金義重(H.J. Kim),鄭容昊(Y.H. Chung),權起鉉(G.H. Kwon),朴泰範(T.B. Park),文全一(J.I. Moon),全榮洙(Y.S. Jeon) 대한전기학회 2006 전기학회논문지A Vol.55 No.1
This paper proposes the new voltage event detection method using the weight factor of neural network and describes control system design for the DVR(Dynamic Voltage Restorer) consisted of a rectifier and series inverter applied to 22.9㎸ distribution system. As this method can express the fault level of each phase, we expect the proposed method can make up for disadvantage of synchronous detection method. Also, in this paper, the control system was designed using double deadbeat controller. As it has an inner current control loop and an outer voltage control loop, we can easily limit the current level during the transient intervals by using the current control loop. Simulation and experiment are performed to prove the analysis of the voltage event detection method and double deadbeat controller.
초정밀가공기용 타원 진동절삭 공구대의 설계 및 성능실험
이대희(D. H. Lee),김호상(H. S. Kim),김의중(E. J. Kim),오창진(C. J. Oh) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper presents the design and test of elliptical vibration assisted cutting tool post. It is actuated by two piezoelectric actuators which are connected to the moving part through the elastic hinge with its role of imposing the preliminary pressures. These two actuators are located at right angles so that the resulting tool tip moves like a two-dimensional ellipse. Also, the tool post is activated within the region of linear actuation in order to overcome the distorted elliptical motion. For the precise measurement of the displacement of the tool tip, three-dimensional experimental apparatus was designed and the strokes of the tool post in major and minor axes were measured. The results show that the tool post can produce the variety of vibration locus from a circle with a radius of 5 ㎛ to an ellipse with a major axis, a = 10 ㎛, and a minor axis, b = 2.5 ㎛.