Regional pole placement of wind turbine generator system via a Markovian approach

Abstract

The wind turbine generator system (WTGS) is usually linearised around operating points, and traditional control techniques concentrate on local dynamic response nearby each operating point. However, the actual wind speed is switching frequently between different operating points, which could cause a serious negative influence on the stability and dynamic response of WTGS. To overcome this disadvantage, this study proposes a systematic method to combine the switching rule into the control design to improve the dynamic response of the mechanical side of WTGS. Through modelling the WTGS driven by the switching wind speed into a class of linearised Markovian jump controlled systems, the regional pole placement technique is developed for such a class of systems and applied on improving the dynamic response of WTGS. Combined with the H ∞ control, the proposed method can achieve better wind energy conversion efficiency and reduce the power volatility efficiently. Through combining the analysis on the actual historical wind speed into the control design, simulation results for a 2 MW wind turbine show the effectiveness of the proposed method.