An Adaptive Phase-Locked Loop for the Transient Stability Enhancement of Grid-Connected Voltage Source Converters

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4 Citations (Scopus)

Abstract

The phase-locked loop (PLL) is widely used in voltage source converters (VSCs) for the purpose of grid synchronization. This paper presents a comprehensive analysis of the impact of the PLL on the transient stability of VSCs. By using the phase portrait, the large-signal nonlinear responses of the PLL with different controller parameters after transient disturbances are characterized. It points out that increasing the damping ratio and the settling time of the PLL is beneficial for the transient stability enhancement of VSCs. On the other hand, the parameters of the PLL are also constrained by the small-signal stability and the dynamic performance requirement of the VSC. In order to improve the transient stability of the VSC, an adaptive PLL is proposed in this paper. The method allows the PLL to operate with the pre-designed parameters in the normal operation, yet to increase its damping ratio adaptively during the transient period. Time-domain simulations and experimental tests are given to verify the effectiveness of the theoretical analysis.
Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages7
PublisherIEEE
Publication dateSep 2018
Pages5892-5898
ISBN (Print)978-1-4799-7313-2
ISBN (Electronic)978-1-4799-7312-5
DOIs
Publication statusPublished - Sep 2018
Event 2018 IEEE Energy Conversion Congress and Exposition: ECCE - Portland, United States
Duration: 23 Sep 201827 Sep 2018

Conference

Conference 2018 IEEE Energy Conversion Congress and Exposition
CountryUnited States
CityPortland
Period23/09/201827/09/2018
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

Keywords

  • Transient Stability
  • Phase-locked loop (PLL)
  • Phase portrait
  • Voltage Source Converters

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    Wu, H., & Wang, X. (2018). An Adaptive Phase-Locked Loop for the Transient Stability Enhancement of Grid-Connected Voltage Source Converters. In Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition (ECCE) (pp. 5892-5898). IEEE. IEEE Energy Conversion Congress and Exposition https://doi.org/10.1109/ECCE.2018.8558206