A novel DC link energy shaping process for minimizing the transient frequency variations in microgrids

Salman Harasis, Yilmaz Sozer, Malik Elbuluk, Haitham Abu-Rub

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The transient energy margin of large-scale power-electronic-interfaced microgrid is very limited. Typically, this margin is stored in the rotor of synchronous generators which acts as a low pass filter for power system disturbances. In microgrid, the transient frequency ride through (TFRT) capability becomes very limited or marginal. Thus, the system stability is induced under small disturbance conditions, which results in large frequency deviation upon any load change or source on/off switching. This paper proposes a novel method to suppress the frequency variation by controlling the energy stored in multiple dc link capacitors based on the instantaneous energy mismatch between the supply and the demand. The Energy Shaping Process (ESP) proposed here aims to control the magnitude and the insertion time of the released energy from multiple coordinated dc links such that the frequency nadir and the rate of change of frequency (RoCoF) are both minimized. The ESP considers the sign of the energy mismatch, the sign of the frequency variation, and the sign of frequency variation's derivative. ESP provides flexible virtual inertia. The results show that ESP is very efficient in suppressing the energy mismatch, as well as, the frequency variation during transient events, which leads to stable and reliable microgrid operation.

Original languageEnglish
Title of host publication34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3274-3280
Number of pages7
ISBN (Electronic)9781538683309
DOIs
Publication statusPublished - 24 May 2019
Event34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States
Duration: 17 Mar 201921 Mar 2019

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2019-March

Conference

Conference34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
CountryUnited States
CityAnaheim
Period17/3/1921/3/19

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Keywords

  • Dc link
  • Energy shaping process (ESP)
  • Frequency fluctuation
  • Stability
  • Virtual inertia

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Harasis, S., Sozer, Y., Elbuluk, M., & Abu-Rub, H. (2019). A novel DC link energy shaping process for minimizing the transient frequency variations in microgrids. In 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 (pp. 3274-3280). [8721991] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; Vol. 2019-March). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2019.8721991