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

Vali, Ali Akbar; Hosseni, Seyed Mohammad Hassan; Olamaei, Javad

doi:10.52547/mjee.15.1.53

Document Type : Review Article

Authors

Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.

https://doi.org/10.52547/mjee.15.1.53

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).

Keywords

20.1001.1.2345377.2021.15.1.7.6

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Majlesi Journal of Electrical Engineering

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

References

References

Volume 15, Issue 1 - Serial Number 1
March 2021
Pages 53-69

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

References

References

Volume 15, Issue 1 - Serial Number 1March 2021Pages 53-69

Volume 15, Issue 1 - Serial Number 1
March 2021
Pages 53-69