Robust subsynchronous interaction damping controller for DFIG-based wind farms

Mohsen Ghafouri, Ulas Karaagac, Houshang Karimi, Jean Mahseredjian

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

This paper proposes a robust controller to improve power system stability and mitigate subsynchronous interaction (SSI) between doubly-fed induction generator (DFIG)-based wind farms and series compensated transmission lines. A robust stability analysis is first carried out to show the impact of uncertainties on the SSI phenomenon. The uncertainties are mainly due to the changes in the power system impedance (e.g., transmission line outages) and the variations of wind farm operating conditions. Then, using the µ-synthesis technique, a robust SSI damping controller is designed and augmented to the DFIG control system to effectively damp the SSI oscillations. The output signals of the supplementary controller are dynamically limited to avoid saturating the converters and to provide DFIG with the desired fault-ride-through (FRT) operation during power system faults. The proposed controller is designed for a realistic test system with multiple series capacitor compensated lines. The frequency of the unstable SSI mode varies over a wide range due to the changes in power system topologies and wind farm operating conditions. The performance of the proposed controller is verified through electromagnetic transient (EMT) simulations using a detailed wind farm model. Simulation results also confirm the grid compliant operation of the DFIG.

Original languageEnglish
Pages (from-to)1663-1674
Number of pages12
JournalJournal of Modern Power Systems and Clean Energy
Volume7
Issue number6
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Doubly-fed induction generator (DFIG)
  • Robust control
  • Series capacitor compensation
  • Subsynchronous interaction (SSI)
  • µ-synthesis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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