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장민영(Minyeong Jang),남정한(Junghan Nam),이세경(Sekyoung Lee),최종민(Jongmin Choi),육심균(Simkyun Yook) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
A Distributed Control System (DCS) is used in electrical power grids and electrical generation plants, environmental control systems, water management systems. oil refining plants and chemical plants. The system needs high reliability for monitoring and controlling distributed equipment. The fault-tolerant system has been presented to satisfy system reliability. The Fault-tolerant system is typically based on the concept of redundancy. Generally, the Triple Modular Redundancy (TMR) uses the voting mechanism. Thus. it needs voter modules. However, the single point of failure could be caused on the voter. For this reason, the voter must be composed as the redundancy for system reliability. This paper shows a new redundant structure of the voter. Voters are configured as a duplex redundancy. It offers easy repair and high reliability.
A Fuel Cell Simulator for Control Logic Verification and Operator Training
맹좌영(Maeng, Jwayoung),김성호(Kim, Sungho),정원희(Jung, Wonhee),강승엽(Kang, Seungyup),홍석규(Hong, Sukkyu),이세경(Lee, Sekyoung),육심균(Yook, Simkyun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
This research presents a fuel cell simulator for control logic verification and operator training. Nowadays, power industries are focusing on clean energy as a response to new policy. The fuel cell can be the solution for clean energy, but operating technology is not well developed compared to other conventional power plans because of its short history. Therefore we need a simulator to verify the new control strategy and train operators, because the price of a real fuel cell system is too high and mechanically weak to be used for these kind of purposes. To develop the simulator, a 300 KW MCFC(Molten Carbonate Fuel Cell) system was modeled with stack, BOPs(pre-reformer, steam generator, etc) and mechanical components(valves, pipes, pumps, blowers, etc). The process model was integrated to emulated control system and HMI(Human Machine Interface). A static load and open loop tests were conducted for verifying the accuracy of the process model, since it is the most important part in the simulation. After verifying the process model, an automatic load change and start-up tests were conducted to verify the performance of a new control strategy(logic and functional loops).