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박정수(Jungsoo Park),정홍주(Hong-Ju Jung),한영성(Youngseong Han),김래영(Rae-Young Kim),정정주(Chung Choo Chung) 대한전기학회 2011 전기학회논문지 Vol.60 No.12
According to the 5th national plan for electric power demand and supply, the 3rd HVDC link will be installed between KEPCO and Jeju Island system and go into operation in June, 2016. However, if it adopt LCC HVDC, Jeju power system could be in voltage instable condition. In order to solve the problem, we propose the application of VSC HVDC to the 3rd HVDC project. In the past, VSC HVDC has many disadvantages such as, inefficiency in conversion, size limit, and expensiveness, compared to LCC HVDC. Recently, the new technologies and the demand for renewable energy interconnection are leading a large growth in VSC HVDC market. In this paper, we will introduce the technical and market trends of VSC HVDC and power system stability analysis results for Jeju power system having LCC and VSC HVDCs.
Cage Design Development for Low Oil Agitation Torque using CFD
Jungsoo, Park(박정수),Jeongsik, Kim(김정식),Junhwan, Hwang(황준환),Changgi Lee(이창기) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In the high speed ball bearing used to EV motor, the friction torque reduction is the essential design factor for fuel efficiency of power train system. In contradiction with friction torques such as a loaded dependent torque from rolling element and a frictional torque due to EHL, the standardization of friction torque of oil agitation torque is limited due to variable cage design. It would be available to verify test. Recently the implement of CFD has been reduced the time consumption of cage development by reducing test verification. This study utilizes CFD in order to expedite development of cage for high speed ball bearing. The simplified model of CFD is based on previous research in this study and a new cage design develop by utilizing CFD. In this approach, the developed cage design is available to show the friction torque reduction in the friction torque test.