A Study on the Harmonic Resonance during Energizing Primary Restorative Transmission Systems: Korean Power System Case

Minhan Yoon, Wonkeun Yu, Junghyun Oh and Heungjae Lee
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Minhan Yoon: Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Korea
Wonkeun Yu: Department of Automatic Electrical Engineering Technology, Yeungnam University College, Daegu 42415, Korea
Junghyun Oh: Department of Robotics, Kwangwoon University, Seoul 01897, Korea
Heungjae Lee: Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Korea

Energies, 2022, vol. 15, issue 1, 1-14

Abstract: In this paper, a power system restoration study following a massive or complete blackout was performed. The power system restoration process from a complete shutdown system without the operating generation and load starts with energizing primary restorative transmission systems. During this primary restoration process, unexpected over-voltage may occur due to nonlinear interaction between the unloaded transformer and the transmission system. This is known as the harmonic resonance phenomenon that may cause the burning out of a transformer or other devices. So far, harmonic resonances have been reported in some extra-high voltage systems around the world. Since the harmonic resonance originates from the nonlinear characteristics of the power system components, it is very difficult to predict the occurrence of this phenomenon. This paper reports the analyses of the harmonic resonance that can occur in the Korean power system. In addition, through calculating the required buffer load compared to the length of the line, a solution that changes the length of the restoration path impedance considering the specificity of the Korean system was presented. The various analyses of harmonic overvoltage, including methodologies that are used internationally as comparison groups, are provided based on PSCAD/EMTDC simulations.

Keywords: power system restoration; over-voltage; harmonic resonance; PSCAD/EMTDC (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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