Double Impedance-Substitution Control of DFIG Based Wind Energy Conversion System

Yu Zhang, Jiahong Liu, Meilan Zhou (), Chen Li and Yanling Lv
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Yu Zhang: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Jiahong Liu: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Meilan Zhou: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Chen Li: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Yanling Lv: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China

Energies, 2022, vol. 15, issue 15, 1-19

Abstract: In a doubly-fed induction generator (DFIG)-based wind energy conversion system (WECS), when the grid voltage sags severely, the rotor side converter (RSC) suffers from overvoltage and overcurrent owing to the large electromotive force (EMF). To ensure that the converter operates within a safe range when grid faults occur, this paper proposes a double impedance-substitution control (DISC) strategy to improve the system’s low-voltage ride through (LVRT) capability. When the grid voltage sag is detected, the grid side converter (GSC) and RSC are connected in parallel to the rotor circuit by changing the topology of the system. In the new topology, GSC and RSC are equivalent to inductive impedance by controlling, which can not only suppress the overvoltage and overcurrent at the rotor side, but also effectively reduce the torque ripple. Additionally, the DISC strategy can provide reactive power support to the grid during LVRT. Finally, the simulation results show that the DISC strategy can maintain the current flowing through the RSC within ±1 p.u., and compared with the existing control strategy, the effectiveness of the proposed method was further demonstrated.

Keywords: doubly-fed induction generator (DFIG); low-voltage ride through (LVRT); double impedance-substitution control (DISC); rotor side converter (RSC); grid side converter (GSC); wind energy conversion system (WECS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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