Addressing Initial Power Undershoots in Grid-Forming Converters: The Role of RHP Zero

Jianyu Zhou*, Fangzhou Zhao, Heng Wu, Xiongfei Wang

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

This paper investigates initial undershoots during the power response of grid-forming (GFM) converters. At first, the small signal model of the active power control loops (APC) is established. Based on the analytical model, the locations of the closed-loop RHP zero is utilized to indicate the existence and the peak of the initial undershoots. Subsequently, the impacts of the virtual impedance (VI) control and operating points on the initial power undershoots are comprehensively investigated. It is found that the VI control helps to dampen the oscillation but only has minimal influence on the RHP zero. In addition, the larger active power reference and smaller grid voltage leads to stronger undershoots. Finally, simulation results are presented to verify the accuracy of the established model and analysis.

Original languageEnglish
Title of host publication2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Number of pages6
PublisherIEEE
Publication date2023
Pages1374-1379
ISBN (Electronic)9798350316445
DOIs
Publication statusPublished - 2023
Event2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023 - Nashville, United States
Duration: 29 Oct 20232 Nov 2023

Conference

Conference2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Country/TerritoryUnited States
CityNashville
Period29/10/202302/11/2023
SponsorCOMSOL, DELTA, et al., Hitachi, John Deere, Oak Ridge National Laboratory
Series2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • active power response
  • GFM converters
  • initial undershoots
  • RHP zero

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