Event-Triggered Robust Control Design to Improve the Dynamic Stability of WECS-based Microgrids
Publication Name
IEEE Transactions on Industry Applications
Abstract
This paper proposes a robust control scheme based on the event-triggered sliding mode control (ETSMC) for WECSbased microgrids. The scheme is designed to effectively mitigate the dynamic instabilities of the WECS with power support from a static synchronous compensator (STATCOM). The design also ensures maximum power support during network disturbances by coordinating between the operation of the STATCOM and the rotor side converter of the DFIG. Reliance on an event-triggered approach enables the control input to be updated only when certain pre-established conditions (triggering instants) are violated. Thus, the communication channel is only utilized during these instances and remains free otherwise which results in reduced communication channel bandwidth and computational power. It also leads to a significant reduction in the chattering phenomena typically associated with the standard SMC. The ETSMC-based robust control design is validated using a WECSbased microgrid subject to different types of network instabilities and mismatched uncertainties. The obtained results confirmed the ability of the proposed approach to effectively mitigate dynamic instabilities. Further comparison with a standard SMC-based approach confirmed the superior performance of the proposed ETSMC-based approach in terms of effectiveness in mitigating dynamic instabilities, improved harmonic performance and significant reduction in the communication load.
Open Access Status
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