Improved Low Voltage Ride-Through Capability of DFIG with ESO Controller under Unbalanced Network Conditions

  • Ali Akbar Vali Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
  • Seyed Mohammad Hassan Hosseni Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
  • Javad Olamaei Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
Keywords: LVRT, FCL, ESO–DFIG, Unbalance Network

Abstract

Under unbalanced grid condition, in a Doubly-Fed Induction Generator (DFIG), voltage, current, and flux of the stator become asymmetric. Therefore, active-reactive power and torque will be oscillating. In DFIG controlling Rotor Side Converter (RSC) aims to eliminate power and torque oscillations. However, simultaneous elimination of the power and torque oscillations is not possible. Also, Grid Side Converter (GSC) aims to regulate DC-Link voltage. In this paper, in order to regulate DC-Link voltage, an Extended State Observer (ESO) based on a Generalized Proportional-Integral (GPI) controller, is employed. In this controlling method, DC-Link voltage is controlled without measuring the GSC current, and due to using the GPI controller, the improved dynamic response is resistant against voltage changes, and the settling time is reduced. To improve the transient stability and Low Voltage Fault Ride Through (LVRT) capability of DFIG, Statistic Fault Current Limiter (S-FCL) and Magnetic Energy Storage Fault Current Limiter (MES-FCL) are proposed in this paper. The proposed FCL does not only limit the fault current but also fasten voltage recovery. The simulations are implemented by MATLAB software in the synchronous positive and negative sequence reference (d-q).

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Published
2021-03-01
How to Cite
Vali, A. A., Hosseni, S. M. H., & Olamaei, J. (2021). Improved Low Voltage Ride-Through Capability of DFIG with ESO Controller under Unbalanced Network Conditions. Majlesi Journal of Electrical Engineering, 15(1), 53-69. https://doi.org/https://doi.org/10.29252/mjee.15.1.53
Section
Articles