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Voltage stability analysis using a complete model of grid-connected voltage-source converters

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Zou Zhixiang, Buticchi Giampaolo, Liserre Marco, Kettner Andreas Martin, Paolone Mario,
Project Integration of Intermittent Widespread Energy Sources in Distribution Networks: Scalable and Reliable Real Time Control of Power Flows
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Proceedings (peer-reviewed)

Title of proceedings 2016 IEEE Energy Conversion Congress and Exposition (ECCE)
Place Milwaukee, WI, USA
DOI 10.1109/ecce.2016.7855562

Open Access

URL https://ieeexplore.ieee.org/document/7855562
Type of Open Access Website

Abstract

Due to the increasing popularity of renewable energies, a significant share of the power generation in future microgrids is expected to originate from converter-interfaced Distributed Energy Resources (DERs). Traditionally, idealized device models are used to conduct grid stability studies. For instance, a DER interfaced via a Voltage-Source Converter (VSC) would be modeled as an ideal current or power source (depending on the control schemes), ignoring non-ideal behavior like the response of the converter synchronization. However, such a simplification may lead to misjudging the stability, in particular for weak microgrids. To address this issue, ZIP models of grid-interfaced VSCs, which take into account both the control scheme and the synchronization, are developed in this paper. The influence of the synchronization response on the stability of a weak microgrid system is demonstrated using a benchmark system simulated in MATLAB/Simulink. It is shown that the idealized models normally used for static stability analysis do underestimate the voltage stability issue in the investigated microgrid system.
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