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Seamless Transfer를 위한 계통연계형 인버터의 간접전류 제어기법
유태식(Taesik Yu),최세완(Sewan Choi),김효성(Hyosung Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Distributed generation (DG) systems fall in islanding operation when they still in operation even when the main grid is out of electric power. Islanding operation is further classified into intentional islanding and unintentional islanding operations. In intentional islanding operation, the DG backs up critical loads while it separates from the main grid on islanding detection. Intentional islanding operation increases utilization of the DG system during the islanding operation. This paper proposes reasonal inverter topology and its control algorithm for seamless transfer of DG systems in intentional islanding operation.
dSPACE를 사용한 Line Interactive UPS의 제어알고리즘 개발
유태식(Taesik Yu),김두환(Duhwan Kim),김효성(Hyosung Kim) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
1㎾~10㎾급의 UPS 토폴로지로서 Line Interactive UPS가 많이 사용되고 있다. Line Interactive UPS는 Single Stage의 AC/DC 변환기 구조를 갖으며 정상상태에서는 적은 전류로 DC측 에너지 저장장치의 충전상태를 유지만 하면 되므로 운전 효율이 높고 가격이 저렴하다. 그러나 고성능의 전류/전압 제어기술이 요구되므로 제품화하는데 어려움이 많다. 본 논문에서는 MATLAB Simulink와 연동하여 간단히 다양한 제어알고리즘을 구현 할 수 있는 dSPACE 장비를 사용하여 실험 장치를 구축하고 Single Stage UPS의 제어알고리즘을 구현하였다.
Underwater Walking Mechanism of Underwater Amphibious Robot Using Hinged Multi-modal Paddle
Taesik Kim,Young-woon Song,Seokyong Song,Son-Cheol Yu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
This study proposes an underwater walking mechanism for an underwater amphibious robot that is propelled by a degree of freedom flapping foil system. To implement stable walking in water, we proposed a distinctive hinged multi-modal paddle and developed an underwater amphibious robot. For the proposed paddle, forward walking model is proposed regarding both the ground contact and hydrodynamic forces in each walking phase: the stanceand swing phases. Then, we generalized dynamic equations of motion for the amphibious robot based on the forward walking model. The proposed mechanism and robot were evaluated through thrust and forward walking tests in an indoor water tank. The results of the forward walking test exhibited a highly accurate trajectory of leggedlocomotion compared to the model-based simulation results. Moreover, field tests on gravel and soft terrains of aseabed, revealed that the proposed system allowed the amphibious robot to walk qualitatively.
Development of a Biomimetic Underwater Robot for Bottom Inspection of Marine Structures
Seokyong Song,Taesik Kim,Young-woon Song,Juhwan Kim,Son-Cheol Yu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
Underwater inspection of marine structures is important to ensure the safety and integrity of infrastructure; however, stable exploration using conventional underwater robots is limited because of various factors such as biofouling and currents. This study focuses on inspecting the surface under a marine structure. To inspect the surfaces covered with biofouling, a biomimetic underwater robot for inspection of marine structures (BRIM) with swimming, walking, and obstacle-negotiation capabilities was developed. The design parameters for walking on uneven terrain were adjusted, and a gait was developed to push aside obstacles that obstruct the view. Simulations of the dynamic models were implemented and stability measures of walking with various attitudes were computed to verify the proposed method. The feasibility of the robot in real-life scenarios was verified by performing unit and feasibility tests inside a water tank, demonstrating the effectiveness of the proposed system.
300V DC Feed System for Internet Data Center
Du-Hwan Kim,Taesik Yu,Hyosung Kim,Hyungsoo Mok,Kyung-Seok Park 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Internet Data Centers (IDC), as essential facilities for modern IT industry, typically have scores of ㎿ of concentrated electric loads. Uninterruptible Power Supplies (UPS) are necessary for the power feed system of IDCs because of stable power requirement. Thus, conventional AC power feed systems of IDCs have three cascaded power conversion stages such as (AC-DC), (DCAC), and (AC-DC), which results in very low conversion efficiency. On the contrary, DC power feed systems need just a single power conversion stage (AC-DC) supplying AC mains power to DC server loads, which gives comparatively high conversion efficiency and reliability [5]. This paper compares the efficiencies between 220V AC power feed system and 300V DC power feed system on equal load conditions which were established in Mok-Dong IDC of Korea Telecom Co. Ltd. (KT). Experimental results show that the total operation efficiency of the 300V DC power feed system is around 15% higher than that of the 220V AC power feed system.