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퍼지-이동슬라이딩모드 제어기를 이용한 ER 현가장치의 제어
조재완(Jaewan Cho),최승복(Seungbok Choi),정시영(Siyoung Jung) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper presents a robust and superior control performance of a quarter-vehicle electrorheological (ER) suspension system. In order to achieve this goal, a moving sliding mode control algorithm is adopted, and its moving strategy is tuned by fuzzy logic. As a first step, ER shock absorber is designed and manufactured for a commercial suspension system, and its field-dependent damping force is experimentally evaluated. After formulating the governing equation of motion for the quarter-vehicle ER suspension system, a stable sliding surface and moving algorithm based on fuzzy logic are formulated. The sliding mode controller is then synthesized and control performance such as vertical displacement is evaluated in time domain.
Frequency Control of Converter Fed Micro-grid for Flexible Frequency Operation
Jaewan Suh,Dong-Hee Yoon,Yoon-Sung Cho,Gilsoo Jang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Recently, uncertainty in power system increase rapidly. On the other hand, the new construction of power plant or transmission line runs into opposition by the resistance of the local people. And those makes the power system operation more difficult. Because of those challenges new methodologies are required to gain the flexibility of the power grids. Flexible frequency operation provides customized frequency through BTB HVDC, overall system is operated in relaxed frequency regulation. In this operation, sensitive loads which need high quality electric power are operated as micro-grid by BTB HVDC. This paper presents control of converter which connect microgrid to power system in flexible frequency operation. In test system, main power system is operated in flexible frequency regulation and micro gird is operated in high quality frequency. Simulation result shows contribution of proposed control strategy for main-grid frequency control in flexible operation.