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 and Eduard Muljadi
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Youngho Cho: School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea
Kyeon Hur: School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea
Yong Cheol Kang: Department of Electrical Engineering, Chonbuk National University, Jeonju 54896, Korea
Eduard Muljadi: National Renewable Energy Laboratory, Golden, CO 80401, USA

Energies, 2017, vol. 10, issue 9, 1-17

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.

Keywords: impedance-based stability; generator interconnection; converter-interfaced generation; harmonic stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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