The Frequency Spectrum Analysis of Wideband Oscillations of Grid-Connected Voltage Source Converter

Liyi Wang and Deyu Cai ()
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Liyi Wang: School of Electrical Engineering, Shandong University, Jinan 250061, China
Deyu Cai: School of Electrical Engineering, Shandong University, Jinan 250061, China

Sustainability, 2023, vol. 15, issue 13, 1-21

Abstract: With the widespread application of voltage source converters (VSCs) in power systems with high renewable resource penetration, the problem of wideband oscillations caused by interactions between power converters and the power grid has drawn great attention. This paper presents a new methodology for simplifying the mathematical derivations of the impedance model of a VSC. Using the new simplified model, the stability and spectrum characteristics of the performance of the VSC can be clearly analyzed. The proposed second-order d-q impedance model of a grid-connected VSC in the presence of a PLL not only mathematically demonstrates that wideband oscillatory modes always occur in conjugate pairs, but also delivers a clear vision of the physical essence of these wideband oscillations. A classic modal analysis is executed in this paper to demonstrate the stability and frequency spectral characteristics of wideband oscillations in a VSC integrated system. The impact of the control parameters of the VSC on wideband oscillatory stability is thoroughly analyzed by modal analysis using ‘DIgSILENT PowerFactory’ as well as hardware-in-the-loop experiments. This methodology can be considered a powerful tool for the control design of VSCs in the modern power system.

Keywords: voltage source converter (VSC); wideband oscillations; equivalent impedance model; modal analysis for VSC (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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