摘要
For the discrete-time system which is subjected to uncoupled actuator faults and sensor faults simultaneously,a robust fault diagnosis method based on a proportional integral observer (PIO) is presented.The proposed PIO uses an additionally introduced integral term of the output errors to obtain the estimationof actuator faults. Besides, the sensor faults are regarded as the augment states so that the PIO cantrace them. Moreover, the convergence of the PIO is proved. A variable speed wind turbine(VWT) exampleis given to demonstrate the fast convergence and diagnosis precision of the proposed PIO.
For the discrete-time system which is subjected to uncoupled actuator faults and sensor faults simultaneously, a robust fault diagnosis method based on a proportional integral observer （PIO） is presented. The proposed PIO uses an additionally introduced integral term of the output errors to obtain the estimation of actuator faults. Besides, the sensor faults are regarded as the augment states so that the PIO can trace them. Moreover, the convergence of the PIO is proved. A variable speed wind turbine（VWT） example is given to demonstrate the fast convergence and diagnosis precision of the proposed PIO.
基金
Supported by the National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (No. 2007BAF10B00).
