Journal of Green Energy Research and Innovation
Quarterly

A New Method for DFIG Control under ‎Unbalanced Grid Voltage Conditions

Document Type : Research article

Authors

Mohammad Naser Hashemnia
Ali Dehghannayeri

Department of Electrical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran.

https://doi.org/10.61186/jgeri.1.4.86
Abstract
This research presents a comprehensive analysis of the performance of direct power control (DPC) for doubly-fed induction generator (DFIG) under both balanced and unbalanced network voltages. Voltage unbalance in three-phase systems results in the presence of positive and negative sequences in both voltages and currents. This unbalance leads to many issues, including active power ripple, reactive power ripple, and an increase in the Total Harmonic Distortion (THD) of the stator current. Therefore, it is crucial to have efficient control of the system to reduce power fluctuations. This research presents two solutions that aim to mitigate the fluctuations in both active and reactive power. The first strategy employs PI regulators within the controller system. A high selectivity filter (HSF) is employed to separate the fundamental component of stator phase currents from the harmonic components. The second option utilizes DPC (Direct Power Control) based on stator flux. The suggested method computes the active and reactive powers that correspond to positive sequence variables. Since grid unbalance has a smaller impact on stator flux compared to stator voltage, it can be demonstrated that the second suggested controller exhibits superior performance to the conventional DPC controller in unbalanced situations. To evaluate the effectiveness of the suggested techniques, a simulation is conducted on a 2MW Doubly-Fed Induction Generator (DFIG) system using the MATLAB/Simulink environment. The results demonstrate that both of the suggested DPC control approaches outperform the conventional DPC controller in terms of control system performance, even under unbalanced situations. Furthermore, these improvements are achieved without significantly increasing the complexity of the control system.

Graphical Abstract

A New Method for DFIG Control under ‎Unbalanced Grid Voltage Conditions

Highlights

 

  • Conducting a thorough examination of DFIG performance in the presence of unbalanced grid voltage conditions
  • Presenting two strategies aimed at mitigating active and reactive power oscillations
  • Introducing a high selectivity filter (HSF) to separate the fundamental component of stator phase currents from the harmonic components
  • Demonstrating the effectiveness of the proposed method compared to traditional DPC controllers through extensive simulations

 

Keywords

direct power control
doubly fed induction generator
high selectivity filter
PI regulator
stator flux

 

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The ethical issues, including plagiarism, informed consent, misconduct, data fabrication and/or falsification, double publication and/or submission, redundancy, have been completely observed by the authors.

 

Credit Authorship Contribution Statement

Mohammad Naser Hashemnia: Conceptualization,‎ Formal analysis, ‎ Investigation,‎ Methodology,‎ Resources, ‎ Software,‎ Supervision,‎ Validation,‎ Visualization,‎ Roles/Writing-original draft,‎ Writing-review & editing.‎ Ali Dehghan Nayeri: Conceptualization,‎ Software,‎ Validation,‎ Roles/Writing-original draft‎.

 

Bibliography

 Mohammad Naser Hashemnia was born in Mashhad, Iran, in 1983. He received the B.S. degree in electrical power engineering from ‎Ferdowsi University, Mashhad, Iran, in 2006 and the M.S. degree in electrical power engineering from ‎the University of Tehran, Tehran, Iran, in 2008. He earned his Ph.D. degree in electrical power ‎engineering from Sharif University of Technology, Tehran, Iran in 2013. Since 2015 he has been an ‎assistant professor in Mashhad branch, Islamic Azad University, Mashhad, Iran. His primary research ‎interests are electric machine analysis, modeling, and simulation, innovative electrical drive control ‎approaches, and renewable energy systems.

 Ali Dehghan Nayeri was born in Mashhad, Iran, in 1991. He received the B.S. degree in electronic engineering from Eqbal ‎lahoori University, Mashhad, Iran, in 2014 and the M.S. degree in electrical power and renewable energy ‎from Islamic Azad University, Mashhad, Iran, in 2019. His main research interests include analysis, ‎programing and simulation of electric machines, automation and programming control and artificial ‎intelligence‎.

 

Citation

M. N. Hashemnia, and A. Dehghan Nayeri, "A New Method for DFIG Control under Unbalanced Grid Voltage Conditions," Journal of Green Energy Research and Innovation, vol. 1, no. 4, pp. 86-116, 2024.

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Journal of Green Energy Research and Innovation
Volume 1, Issue 4
Autumn 2024
Pages 86-116

  • Receive Date 01 February 2024
  • Revise Date 28 April 2024
  • Accept Date 04 May 2024
  • Publish Date 01 December 2024

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