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Advanced LVRT strategy for SCIG-based wind energy conversion systems using feedback linearization and sliding mode control

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Abstract

This paper proposes an advanced fault ride-through strategy using feedback linearization (FL) and sliding mode control (SMC) for squirrel-cage induction generator (SCIG)-based wind energy conversion systems (WECSs). Based on FL theory, a nonlinear dynamic model of a SCIG wind turbine system is linearized with only two decoupled state variables: d-axis stator current and DC-link voltage. Thus, d-axis stator current and DC-link voltage controllers can be simply designed with the linear control theory. Moreover, with the proposed FL control law, the DC-link voltage control can be performed by directly regulating the q-axis stator voltage without a q-axis current controller. During grid voltage sags, the output power of the SCIG is reduced to maintain the DC-link voltage. By applying SMC theory to the design of d-axis stator current and DC-link voltage controllers, robust performance of control systems can be achieved even under parameter variations. The feasibility of the proposed method has been demonstrated via simulation and experimental results.

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Acknowledgements

This work was supported by Korea Electric Power Corporation under Grant R18XA06-35.

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  1. Department of Electrical Engineering, Yeungnam University, Gyeongsan-si, South Korea

    Anh Tan Nguyen & Dong-Choon Lee

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  1. Anh Tan Nguyen
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  2. Dong-Choon Lee
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Correspondence to Dong-Choon Lee.

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Nguyen, A.T., Lee, DC. Advanced LVRT strategy for SCIG-based wind energy conversion systems using feedback linearization and sliding mode control. J. Power Electron. 21, 1180–1189 (2021). https://doi.org/10.1007/s43236-021-00256-2

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  • DOI: https://doi.org/10.1007/s43236-021-00256-2

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