풍력발전시스템의 운전특성 및 고장원인 분석

Abstract

As of October 2006, the total amount of wind power capacity in Korea is about 172MW. However, several wind turbine generator systems are experiencing machine trouble that causes their shut down for a long time. Since most of supplier of the wind turbine generator system in Korea are VESTAS of Denmark, there are not any engineers in Korea who can solve the machine troubles of the wind turbine. When the wind turbine generator system is in trouble, Korean operator have to wait until the foreign engineers solve the machine troubles. Consequently, it is very important to develop the technology of operation and maintenance of wind turbine generator system. This study has been conducted at Hangwon in Jeju island where wind turbines were operated commercially for the first time in Korea. Operational characteristics of wind turbines in the Hangwon windfarm were investigated to clarify the effect of meteorological condition, the inter-annual effect and further the cause of the trouble of wind turbine. For the purpose of wind data analysis and wind resource estimation, wind data was used directly. The estimated energy production was compared with the actual energy production. The system trouble was also analyzed for monitored period. As the results, with a decrease of system error, the estimated energy production was in good agreement with the actual energy production. it was confirmed that wind resource was variable according to years. Consequently each wind turbine had different wind machine power, different error time and so on. Meteorological conditions such as the typhoon, a strong wind, lightning resulted in troubles of wind turbines. The trouble in components such as gear box, yaw motor and hydraulic motor occurred frequently and it caused stop of the wind turbine for a long time. The machine trouble has affected both availability and capacity factor of the wind turbine generator system.