Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Advanced LVRT strategy for SCIG-based wind energy conversion systems using feedback linearization and sliding mode control

  • Nguyen, Anh Tan (Department of Electrical Engineering, Yeungnam University) ;
  • Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University)
  • Received : 2021.03.17
  • Accepted : 2021.04.21
  • Published : 2021.08.20
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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.

Keywords

Acknowledgement

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

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