Abstract
This paper presents a switching fault-tolerant control (SFTC) strategy for a doubly-fed induction generator-based wind turbine (DFIG-WT) subject to rotor and stator current sensor faults. A novel stator-current-loop vector control scheme is proposed for the regulation of DFIG-WT without involving rotor currents, and it is compared with the conventional rotor-current-loop vector control scheme on closed-loop stability, tracking performance, and robustness against model uncertainties and external disturbances through theoretical analysis. The SFTC strategy switches between the rotor and stator current vector controllers via a switching logic based on Kalman filter-based fault detection and isolation (FDI) scheme. The proposed SFTC strategy is able to provide superb transient and steady-state performance, strong robustness to parameter uncertainties, and high fault-tolerance capability under rotor and stator current sensor faults. Simulation studies verify the control performance of the SFTC strategy.
Highlights
Wind energy is one of the most promising renewable energy sources, which has attracted enormous attentions over past decades due to energy crisis and environment pollution [1]–[3]
A switching fault-tolerant control (SFTC) strategy is proposed to overcome the deficiency of observer-based fault-tolerant control (OFTC) and ensure the continuous operation of doubly-fed induction generator-based wind turbine (DFIG-WT) with rotor and stator current sensor faults
Under the condition of current sensor faults, the SFTC strategy switches between rotor-currentloop vector control (RVC) and stator-current-loop vector control (SVC) based on the Kalman filter-based fault detection and isolation (FDI) logic, which is described as follows
Summary
Wind energy is one of the most promising renewable energy sources, which has attracted enormous attentions over past decades due to energy crisis and environment pollution [1]–[3]. Recent literatures have proposed various observer-based fault-tolerant control (OFTC) methods for the DFIG-WT with current sensor faults. The transient response of DFIG-WT controlled via OFTC depend on the appropriate design of state observer, and the coefficients of observer must be carefully tuned to ensure system stability under sensor fault condition. This drawback degrades the transient performance of OFTC and affects the stable operation of DFIG-WT. A switching fault-tolerant control (SFTC) strategy is proposed to overcome the deficiency of OFTC and ensure the continuous operation of DFIG-WT with rotor and stator current sensor faults.
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