Abstract
The installed energy production capacity of wind turbines is growing intensely on a global scale, making the reliability of wind turbine subsystems of greater significance. However, many faults like Inter-Turn Short-Circuit (ITSC) may affect the turbine generator and quickly lead to a decline in supplied power quality. In this framework, this paper proposes a Sliding Mode Observer (SMO)-based Fault Tolerant Control (FTC) scheme for Induction Generator (IG)-based variable-speed grid-connected wind turbines. First, the dynamic models of the wind turbine subsystems were developed. The control schemes were elaborated based on the Maximum Power Point Tracking (MPPT) method and Indirect Rotor Flux Oriented Control (IRFOC) method. The grid control was also established by regulating the active and reactive powers. The performance of the wind turbine system and the stability of injected power to the grid were hence analyzed under both healthy and faulty conditions. The robust developed SMO-based Fault Detection and Isolation (FDI) scheme was proved to be fast and efficient for ITSC detection and localization.Afterwards, SMO were involved in scheming the FTC technique. Accordingly, simulation results assert the efficacy of the proposed ITSC FTC method for variable-speed wind turbines with faulty IG in protecting the subsystems from damage and ensuring continuous connection of the wind turbine to the grid during ITSC faults, hence maintaining power quality.
Highlights
Wind energy conversion systems present one of the most safety-critical engineering systems.They include complicated components operating under random wind conditions directly coupled to a constantly varying grid with variable voltages, frequency and power flow
Presents simulation results in the time-domain of the outputs signals of the studied control schemes sq and its reference isq* are the most disturbed by ITSCanalysis fault
Indirect Rotor Flux Oriented Control (IRFOC) scheme must to be replaced by a robust fault tolerant control technique able to compensate Inter-Turn Short-Circuit (ITSC) influences
Summary
Wind energy conversion systems present one of the most safety-critical engineering systems. They represent one of the most robust observers permitting the identification of the type and the shape of faults and their isolation This task is called a Fault Detection and Isolation (FDI) scheme. Each anomaly leads to the interruption of the normal operation of the whole system and requires a proper tolerant action In this context, this study focuses on Inter-Turn Short-Circuit (ITSC) fault. In [14], ITSC faults were detected based on stator resistance estimation by an extended Kalman filter and a Luenberger observer. Current2017, estimation by SMO to detect and compensate ITSC faults for closed-loop grid-connected wind turbines. The developed fault tolerant control scheme is assumed to be robust towards uncertainties in this aerodynamic model.
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