Impedance-based stability analysis in grid interconnection impact study owing to the increased adoption of converter-interfaced generators

Youngho Cho, Kyeon Hur, Yong Cheol Kang, Eduard Muljadi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study investigates the emerging harmonic stability concerns to be addressed by grid planners in generation interconnection studies, owing to the increased adoption of renewable energy resources connected to the grid via power electronic converters. The wideband and high-frequency electromagnetic transient (EMT) characteristics of these converter-interfaced generators (CIGs) and their interaction with the grid impedance are not accurately captured in the typical dynamic studies conducted by grid planners. This paper thus identifies the desired components to be studied and subsequently develops a practical process for integrating a new CIG into a grid with the existing CIGs. The steps of this process are as follows: the impedance equation of a CIG using its control dynamics and an interface filter to the grid, for example, an LCL filter (inductor-capacitor-inductor type), is developed; an equivalent impedance model including the existing CIGs nearby and the grid observed from the point of common coupling are derived; the system stability for credible operating scenarios is assessed. Detailed EMT simulations validate the accuracy of the impedance models and stability assessment for various connection scenarios. By complementing the conventional EMT simulation studies, the proposed analytical approach enables grid planners to identify critical design parameters for seamlessly integrating a new CIG and ensuring the reliability of the grid.

Original languageEnglish
Article number1355
JournalEnergies
Volume10
Issue number9
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Interconnection
Converter
Impedance
Stability Analysis
Generator
Grid
Renewable energy resources
Power electronics
System stability
Capacitors
Filter
Scenarios
Power Electronics
Renewable Energy
Dynamic Control
Capacitor
Parameter Design
Harmonic
Simulation Study
Resources

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this

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Impedance-based stability analysis in grid interconnection impact study owing to the increased adoption of converter-interfaced generators. / Cho, Youngho; Hur, Kyeon; Kang, Yong Cheol; Muljadi, Eduard.

In: Energies, Vol. 10, No. 9, 1355, 01.01.2017.

Research output: Contribution to journalArticle

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