Safety Analysis Of Wind Turbine Speed Based On Lyapunov Theory

In order to analyze the safety of wind turbines,a reference model of wind turbine system is established.A single shutdown strategy is applied to simulate the two conditions,one of them is generator overspeed shutdown,another is power overspeed shutdown.When wind turbines in the prior condition is insufficient,it can obtain state space equation accroding to the subsystem of space identification method through the simulation input and output data,compared with the traditional identification method,the operation data fitting degree is very high and it is more convenient and direct.Based on Lyapunov stability theory to get Lyapunov function V and the target threshold parameters,obtained the wind turbine safe threshold and stable operation and verified by the different running states of wind turbine operation data to ensure the accuracy of obtaining the safety area.The main conclusions are as follows:the wind turbine safety chain is provided with a single stop trigger strategy,so that the wind turbine shutdown due to a single variable value,can get different physical quantities under the condition of a limited operation;In case of insufficient conditions,it can obtain the 5 order state space equation of wind turbine system by using the subspace identification system method.The generator speed and power are system outputs;According to the Lyapunov stability theory to gain Lyapunov function V based on the system state space equation to constructe the safety threshold,the system can ensure in steady state operation when operation data falls in the safety threshold limit.