Event-triggered SMC-based FRT Approach for DFIG-based Wind Turbines Equipped with DVR with High Frequency Isolation
IEEE Journal of Emerging and Selected Topics in Power Electronics
This paper proposes an event-triggered sliding mode control (SMC)-based fault ride through (FRT) strategy for doubly-fed-induction-generator (DFIG)-based wind turbines. An event-triggered SMC (ETSMC) approach is designed for a dynamic voltage restorer (DVR) with a high frequency isolated dc-dc converter. The aim is to regulate the stator terminal voltage by injecting appropriate voltage to regulate it near the reference point. Since the control signal in the event-triggered SMC is only updated when certain conditions are violated, the proposed approach results in reduced computational burden and channel bandwidth. Additionally, it reduces the chattering phenomena typically associated with SMC and reduces harmonic distortion. The ETSMC is augmented by a disturbance observer to further improve its robustness against mismatched uncertainties. The DVR topology considered in this paper utilizes high frequency isolation transformer, which dramatically reduces the costs associated with the regular isolation transformer. The proposed FRT strategy is validated with a DFIG-based wind turbine connected to a test microgrid. The obtained results confirmed the effectiveness of the proposed approach in mitigating dynamic instabilities resulting from grid faults while minimizing the usage of the communication channel.
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