Empirical Evaluation of GPS Clock Accuracy for Isochronous Droop-based Inverters

Toby Meyers, Barry Mather

Research output: Contribution to conferencePaperpeer-review

3 Scopus Citations

Abstract

Grid-forming inverters rely upon an internal reference to regulate the grid 's voltage and frequency. Without a reliable reference, issues such as loss of synchronism, frequency instability, and unequal power sharing can occur. One proposed internal phase reference for grid-forming inverters is generated by the controller's clock, but this is affected by nonidealities in the crystal oscillator leading to time drift in the phase reference. To improve the controller's clock accuracy, the Global Positioning System (GPS) can be used to calibrate the internal clock. Previously, GPS-based clock calibration was explored theoretically and various methods were developed for mitigating frequency/phase drift at the power system level. This paper experimentally validates the direct performance of GPS time-calibration at the controller level and justifies its use in maintaining an accurate phase reference for droop-based grid-forming inverters.

Original languageAmerican English
Pages390-395
Number of pages6
DOIs
StatePublished - 2021
Event13th IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Virtual, Online, Canada
Duration: 10 Oct 202114 Oct 2021

Conference

Conference13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
Country/TerritoryCanada
CityVirtual, Online
Period10/10/2114/10/21

Bibliographical note

See NREL/CP-5D00-77573 for preprint

NREL Publication Number

  • NREL/CP-5D00-82055

Keywords

  • clock drift
  • decentralized
  • droop
  • GPS
  • grid forming inverter
  • power sharing
  • stability
  • synchronization

Fingerprint

Dive into the research topics of 'Empirical Evaluation of GPS Clock Accuracy for Isochronous Droop-based Inverters'. Together they form a unique fingerprint.

Cite this