Robust PI control of a grid-connected voltage source inverter for virtual inertia response in weak grid conditions

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

Chemical battery energy storage systems (BESS) providing frequency compensation techniques such as virtual inertia response (VIR) can be a solution to tackle the frequency volatility ac-island grids suffer when inverter-based generation such as PV is integrated. However, the inverter connecting the BESS may suffer performance and stability issues when due to a low short circuit ratio (SCR) the inverter phase-locked loop (PLL) and the grid impedance negatively interact. To address this issue this work proposes a robust proportional-integral controller (R-PI) for the inverter inner-loop current control. The R-PI is synthesized by the structured H-infinity method using MATLAB and the performance is compared with a regular proportional-integral controller (PI) designed by the conventional frequency shaping method. A sensitivity analysis that includes the dynamic impact of the PLL is conducted for varying SCR. The analysis is verified by time domain simulations in MATLAB and shows that both the R-PI and the PI maintained the inverter stability under the worst-case SCR of 2. However, the benchmarked transient performance of the regular PI was compromised under the simulated SCR variation of 7.2 to 2, while the R-PI was capable of maintaining this performance throughout the SCR variation.

Original languageEnglish
Title of host publicationSEST 2019 - 2nd International Conference on Smart Energy Systems and Technologies
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)978-1-7281-1156-8
DOIs
Publication statusPublished - 1 Sep 2019
Event2nd International Conference on Smart Energy Systems and Technologies, SEST 2019 - Porto, Portugal
Duration: 9 Sep 201911 Sep 2019

Conference

Conference2nd International Conference on Smart Energy Systems and Technologies, SEST 2019
CountryPortugal
CityPorto
Period9/09/1911/09/19

Keywords

  • frequency response
  • phase locked loop
  • robust control
  • short circuit ratio
  • voltage source inverter

Fingerprint

Dive into the research topics of 'Robust PI control of a grid-connected voltage source inverter for virtual inertia response in weak grid conditions'. Together they form a unique fingerprint.

Cite this