Improved use of wind turbine kinetic energy for system frequency support

Guoyi Xu, Lie Xu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

To ensure security operation of power systems with high wind penetration, wind turbines (WTs) are required to participate system frequency control. The amount of WT kinetic energy used for system frequency control is discussed and minimum rotor speeds according to different WT operation states are defined to avoid large drop of mechanical power during WT frequency control. The effect of different power shapes of releasing the kinetic energy on system frequency support is investigated and two methods are proposed. The first one is aimed at reducing the rate of change of frequency (ROCOF) whereas the second one aimed to reduce both the ROCOF and frequency nadir. The proposed strategies not only make full use of the available kinetic energy but also lead to a smooth transition when the rotor re-accelerates. The performance of the proposed strategies is validated by simulations using Matlab/Simulink. The results indicate significant improvement on system frequency control.
LanguageEnglish
Pages1094-1100
Number of pages7
JournalIET Renewable Power Generation
Volume11
Issue number8
Early online date25 Nov 2016
DOIs
Publication statusPublished - 28 Jun 2017

Fingerprint

Kinetic energy
Wind turbines
Rotors

Keywords

  • power systems
  • high wind penetration
  • wind turbines
  • system frequency control
  • rotor speed
  • kinetic energy
  • rate of change of frequency

Cite this

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title = "Improved use of wind turbine kinetic energy for system frequency support",
abstract = "To ensure security operation of power systems with high wind penetration, wind turbines (WTs) are required to participate system frequency control. The amount of WT kinetic energy used for system frequency control is discussed and minimum rotor speeds according to different WT operation states are defined to avoid large drop of mechanical power during WT frequency control. The effect of different power shapes of releasing the kinetic energy on system frequency support is investigated and two methods are proposed. The first one is aimed at reducing the rate of change of frequency (ROCOF) whereas the second one aimed to reduce both the ROCOF and frequency nadir. The proposed strategies not only make full use of the available kinetic energy but also lead to a smooth transition when the rotor re-accelerates. The performance of the proposed strategies is validated by simulations using Matlab/Simulink. The results indicate significant improvement on system frequency control.",
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Improved use of wind turbine kinetic energy for system frequency support. / Xu, Guoyi; Xu, Lie.

In: IET Renewable Power Generation, Vol. 11, No. 8, 28.06.2017, p. 1094-1100.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Improved use of wind turbine kinetic energy for system frequency support

AU - Xu, Guoyi

AU - Xu, Lie

N1 - This paper is a postprint of a paper submitted to and accepted for publication in IET Renewable Power Generation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

PY - 2017/6/28

Y1 - 2017/6/28

N2 - To ensure security operation of power systems with high wind penetration, wind turbines (WTs) are required to participate system frequency control. The amount of WT kinetic energy used for system frequency control is discussed and minimum rotor speeds according to different WT operation states are defined to avoid large drop of mechanical power during WT frequency control. The effect of different power shapes of releasing the kinetic energy on system frequency support is investigated and two methods are proposed. The first one is aimed at reducing the rate of change of frequency (ROCOF) whereas the second one aimed to reduce both the ROCOF and frequency nadir. The proposed strategies not only make full use of the available kinetic energy but also lead to a smooth transition when the rotor re-accelerates. The performance of the proposed strategies is validated by simulations using Matlab/Simulink. The results indicate significant improvement on system frequency control.

AB - To ensure security operation of power systems with high wind penetration, wind turbines (WTs) are required to participate system frequency control. The amount of WT kinetic energy used for system frequency control is discussed and minimum rotor speeds according to different WT operation states are defined to avoid large drop of mechanical power during WT frequency control. The effect of different power shapes of releasing the kinetic energy on system frequency support is investigated and two methods are proposed. The first one is aimed at reducing the rate of change of frequency (ROCOF) whereas the second one aimed to reduce both the ROCOF and frequency nadir. The proposed strategies not only make full use of the available kinetic energy but also lead to a smooth transition when the rotor re-accelerates. The performance of the proposed strategies is validated by simulations using Matlab/Simulink. The results indicate significant improvement on system frequency control.

KW - power systems

KW - high wind penetration

KW - wind turbines

KW - system frequency control

KW - rotor speed

KW - kinetic energy

KW - rate of change of frequency

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