Improved Singular Perturbation Based Model Reduction of PMSG Integrated Power Systems for Large Disturbance Stability Analysis

With more and more wind farms connected to the power grid, it becomes more and more difficult to analyze the large disturbance fault of power system based on the detailed model of wind turbine. This paper propose an improved method of reduced order model of wind turbine based on singular perturbation theory. Firstly, the linearized model is obtained by the state trajectory of wind turbine after transient fault. The multi time scale characteristics of wind turbine are divided by dominant degree analysis, and the model is simplified by ignoring the fast dynamic variables. Time domain simulation results show that this method has the advantages of high accuracy and can capture the dynamic response of wind turbine after large disturbance fault.