Analytical model for predicting emergency shutdown of a two-bladed horizontal axis wind turbine

摘要

An analytical model was developed to predict the shutdown characteristics of a large two bladed horizontal-axis wind turbine following a sudden loss of generator load. The analytical model is described and used to predict rotor speed time histories following a loss of load, for a tip-control rotor and an aileron control rotor. These shutdown predictions are compared with experimental results from full-scale tests conducted on the Mod-O 100 kW wind turbine with both a tip control rotor and an aileron-control rotor. Predicted and measured rotor speed time histories are compared based on peak overspeed rpm, time at which this peak rpm occurs, and the general shape of the time history curve. The results of this comparison indicated there was good agreement between predictions and the full scale test results, thus verifying the analytical shutdown model. In general, the best agreement between predictions and full-scale test results was obtained up to the time where the peak overspeed rpm occurred.