풍력발전시스템 나셀 내부 화재조기감지 및 위치 판별 방법에 관한 연구

Abstract

Self fire suppression for a nacelle of wind turbine generator system is inevitable because the location of wind farm is generally far from the fire station and the position of the nacelle is too heigh for firefighting equipment to reach it. The thesis presents a method of early fire detection and fire position determination inside the nacelle. The main variables for fire detection can be illumination, temperature and smoke density, so that the environmental characteristics inside is very important. Thus, we analyzed the characteristics of the nacelle environment that is dependent upon the heat generated by various apparatus of the nacelle and the change of outside environments according to the seasons. By analyzing the nacelle environment, we found that the absolute values of temperature and smoke density are not suitable as a fire detection variable because they vary depending on seasonal changes. Illumination is also not suitable for fire detection because the absolute value and the rate of change of it is very high, so that it is very difficult to distinguish whether it is fire or not. Therefore, we developed a method of an early fire detection and fire position determination based on the rising rates of temperature and smoke density that are independent from the seasonal changes. The performance of the method was tested in situation of electric and oil fire that are the most common types of fire inside the nacelle. The results showed that the method is very fast and reliable for fire detection and fire position determination enough to be applied to the actual wind turbine generator system.