CONTROL PERFORMANCE ASSESSMENT OF WIND TURBINE BY STOCHASTIC METHOD

Abstract

This research presents control performance assessment (CPA) techniques by stochastic method to evaluate performance and robustness of PI pitch control system in wind turbine system. Two scenarios affecting performance and robustness of the system, including a fault of pitch actuator and fluctuation of wind speed, are investigated. Simulation data of both scenarios using FAST 7 simulator in MATLAB are analyzed to obtain performance index in terms of minimum variance index and to obtain a robustness index by frequency response analysis. Both performance and robustness are evaluated as on-line measurement. The results showed that CPA techniques by stochastic method adopted in PI pitch control system can effectively indicate variation of performance and robustness in both scenarios.