An Enhanced Control Strategy for Mitigation of State-Transition Oscillation Phenomena in Grid-Forming Self-Synchronized Converter System with Islanded Power System

Ki Ryong Kim, Sangjung Lee, Jong-Pil Lee and Jaesik Kang
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Ki Ryong Kim: Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea
Sangjung Lee: Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea
Jong-Pil Lee: Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea
Jaesik Kang: Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea

Energies, 2021, vol. 14, issue 24, 1-20

Abstract: This paper proposes an enhanced control strategy for mitigating state-transition oscillations in active and reactive power responses of self-synchronized converter system to secure the islanded power system stability. The self-synchronized converter is well known for “grid-forming” that is able to operate to stand-alone mode (SAM) providing grid voltage and frequency without phase synchronization units. Although the grid-forming (GFM) is self-synchronized, the inherent synchronization principle causes system degradation in which should maintain a point of common coupling (PCC) voltage for critical loads as well as transitions from grid-connected mode (GCM) to SAM and vice versa. Therefore, this paper focuses on resolving the inherent oscillatory issues in GFM self-synchronized converter system (especially adopted ‘synchronverter’ principle), and proposes a control strategy for controllability improvement based on stability analysis for smooth state-transition under islanded power system. The efficacy of the proposed control method is verified through a high-fidelity electromagnetic transient (EMT) simulation with case studies on 30kW synchronverter system and further experimental hardware-in-loop system (HILS) test with Opal-RT (OP-5707) platform.

Keywords: self-synchronized converter; synchronverter; grid-forming converter (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: 2021
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