Robust Sensor Fault-Tolerant Control Scheme for Wind Turbines with Hydrostatic Transmission
نویسندگان
چکیده
In this paper, an observer bank design for sensor fault diagnosis and fault-tolerant control schemes for wind turbines with hydrostatic transmissions are presented. The sensor faults are detected and isolated by several observers using different sensor signals. Starting from a detailed problem formulation that takes into account structured model uncertainties and external inputs, the sufficient conditions for robust observer and controller design are obtained by using multiple Lyapunov functions. Thereafter, the drive train is modeled and the resulting nonlinear continuous-time system is transformed into a discrete-time Takagi-Sugeno form. Within the latter model, a fault-tolerant control scheme is set up by means of a switched observer-based parallel distributed controller (PDC) structure, where only the observed state vector, which is not affected by sensor faults, is fed back. Finally, the obtained results are applied to a fault tolerant speed control for wind turbines with hydrostatic transmission in the presence of permanent pressure or displacement sensor faults.
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