A Robust Circuit and Controller Parameters Identification Method of Grid-Connected Voltage Source Converters Using Vector Fitting Algorithm

Weihua Zhou, Raymundo E. Torres-Olguin, Fredrid Goethner, Jef Beerten, Mehdi Karbalaye Zadeh, Yanbo Wang, Zhe Chen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This article presents a vector fitting (VF) algorithm-based robust circuit and controller parameters identification method for grid-connected voltage source converters (VSCs). The dq-domain impedance frequency responses (IFRs) of the VSCs are first measured using frequency scanning method, based on which the corresponding measured phasor-domain IFRs are calculated. Then, polynomial transfer functions are generated by applying the VF algorithm on the measured phasor-domain IFRs, from which the circuit and controller parameters, i.e., LCL filter parameters, digital sampling time, current controller parameters, and phase-locked loop parameters, are identified. Influence of measurement noise on parameters identification accuracy and corresponding countermeasure to mitigate the adverse influence are also theoretically investigated. The proposed method is able to identify the circuit and controller parameters, when detailed parameters are missing due to industrial secrecy or parameters variation caused by operating condition change, temperature fluctuation, or aging. Effectiveness of the proposed circuit and controller parameters identification method is validated by theoretical demonstration, OPAL-RT-based real-time simulation, and experimental validation.

Original languageEnglish
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
ISSN2168-6777
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Impedance frequency responses
  • parameters identification
  • polynomial transfer function
  • vector fitting algorithm
  • voltage source converter
  • Current control
  • Current measurement
  • Transfer functions
  • Converters
  • Impedance
  • Power conversion
  • Phase locked loops

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