Title: Refined vector control structure and indirect MPPT for grid connected DFIG-based wind energy conversion system, and appraisal on matrix converter interface

Authors: Kalimuthu Gayathri; Seenithangam Jeevananthan

Addresses: Department of Electrical and Electronics Engineering, Puducherry Technological University, Puducherry, India ' Department of Electrical and Electronics Engineering, Puducherry Technological University, Puducherry, India

Abstract: The grid integration of doubly fed induction generators (DFIGs) in wind energy systems is actualised by either the two-stage power converter (TSPC: back-to-back converter) or the single stage power converter (SSPC: matrix converter). Earlier field oriented independent active and reactive power control attempts resulted in high ripples and poor power quality. This paper develops a refined vector control structure and incorporates a new indirect maximum power point tracking by exploiting the rule of thumb that for every wind speed, there is a unique optimal electromagnetic torque which extracts the maximum power. The control structure is also modified to the SSPC drive, aptly. The TSPC assumes a stator flux-oriented control (SFOC) for the rotor side converter and a voltage-oriented control for the grid side converter, while a single SFOC is employed in the SSPC. A real-time data driven simulation study on a 2MW DFIG system demonstrates both disturbance rejection and tracking abilities.

Keywords: doubly fed induction generator; DFIG; single stage power converter; SSPC; two-stage power converter; TSPC; total harmonic distortion; THD; Venturini modulation; VM; wind energy conversion system; WECS.

DOI: 10.1504/IJMIC.2024.137997

International Journal of Modelling, Identification and Control, 2024 Vol.44 No.3, pp.255 - 282

Received: 29 Aug 2022
Received in revised form: 09 Jan 2023
Accepted: 24 Jan 2023
Published online: 16 Apr 2024 *

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