Impedance Analysis and PHIL Demonstration of Reactive Power Oscillations in a Wind Power Plant Using a 4-MW Wind Turbine

Przemyslaw Koralewicz, Shahil Shah, Vahan Gevorgian, Robb Wallen, Kapil Jha, Dale Mashtare, Kasi Gadiraju, Arvind Tiwari

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

Abstract

This paper presents impedance-based analysis, mitigation, and power-hardware-in-the-loop (PHIL) demonstration of reactive power oscillations in a wind power plant using a 4-MW Type III wind turbine drivetrain. Because such low-frequency oscillations result from interactions among slower control loops of wind turbines regulating phasor quantities—active and reactive power output of the wind turbine and the magnitude of voltages at the point of interconnection (POI)—a new type of admittance is defined in terms of phasor quantities for their analysis. The so-called power-domain admittance of a wind turbine is defined as the transfer function from the frequency and magnitude of voltages at the POI to the active and reactive power output of the turbine. The power-domain admittance responses of the 4-MW wind turbine are measured using a 7-MVA grid simulator to identify the source of the reactive power oscillations. Power-domain impedance analysis and PHIL experiments are performed to explain how a resonant mode manifests as turbine-to-turbine and plant-to-grid reactive power oscillations. It is discovered that weaker grids exhibiting high inductive impedance mitigate oscillations in the reactive power output of wind power plants; however, a higher grid impedance does not help in damping turbine-to-turbine reactive power oscillations. This paper presents a simple droop-based solution to eliminate both turbine-to-turbine and plant-to-grid reactive power oscillations.

Original languageAmerican English
Article number156
Number of pages14
JournalFrontiers in Energy Research
Volume8
DOIs
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© Copyright © 2020 Koralewicz, Shah, Gevorgian, Wallen, Jha, Mashtare, Gadiraju and Tiwari.

NREL Publication Number

  • NREL/JA-5D00-76053

Keywords

  • impedance analysis
  • power-hardware-in-the-loop experiments
  • reactive power oscillations
  • stability
  • subsynchronous oscillations
  • wind power plants

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