| Hydraulic variable pitch system is an important part of the wind turbine,it play a very important role to ensure the normal operation of the wind turbine.The failures of hydraulic variable pitch system happen frequently,So it is necessary for hydraulic variable pitch system of wind turbine to fault diagnosis.Observer-based fault diagnosis is an important method in the field of fault diagnosis.In this paper,we first establish the mathematical model of hydraulic variable pitch system,then using the approach which is based on observer to design residual error generator,Finally analyzing the residual error to judge whether fault occurs in the hydraulic variable pitch system of wind turbine.For disturbance which is existing in hydraulic variable propeller system of wind turbine,we first use eigenvalue structure assignment approach to designs a robust residual error generator,achieving the goal of residual error decoupled from disturbance.Besides that,we do some improvement for normal eigenvalue structure assignment approach in this paper,we simplify the specific calculation difficulty and introduce the specific steps of The design.Finally,we simulate some hydraulic variable pitch system system failures of wind turbine to show the effectiveness and superiority of this method.For uncertainty and noise which are existing in hydraulic variable propeller system of wind turbine,they will influence the accuracy of fault diagnosis.In this paper,we first use unknown input observer method to designs a robust residual error generator,put uncertainty and noise and disturbance see as unknown input,then make residual error decoupled from unknown input.to achieve the goal of fault diagnosis for hydraulicvariable propeller pitch system.Finally,we through simulation to show the effectiveness and superiority of this method. |
