TY - JOUR
T1 - Loop-at-a-Time Stability Analysis for Grid-Connected Voltage-Source Converters
AU - Zhang, Hongyang
AU - Harnefors, Lennart
AU - Wang, Xiongfei
AU - Hasler, Jean-Philippe
AU - Ostlund, Stefan
AU - Danielsson, Christer
AU - Gong, Hong
PY - 2021/10
Y1 - 2021/10
N2 - The instability phenomena caused by converter–grid interactions can be prevented by designing controllers with adequate stability margins. Yet, the multiple-input–multiple-output (MIMO) dynamics of grid-connected voltage-source converters (VSCs) complicate the stability analysis for the controller design. To tackle this challenge, this article presents a loop-at-a-time stability analysis for grid-connected VSCs, which not only shows close correlations with the generalized Nyquist criterion for MIMO systems but also enables to quantify the stability margins of individual closed loops. Moreover, the interactions between the closed loops can be analyzed. Test cases with numerical sensitivity analysis, simulations, and field measurements of a converter validate the theory.
AB - The instability phenomena caused by converter–grid interactions can be prevented by designing controllers with adequate stability margins. Yet, the multiple-input–multiple-output (MIMO) dynamics of grid-connected voltage-source converters (VSCs) complicate the stability analysis for the controller design. To tackle this challenge, this article presents a loop-at-a-time stability analysis for grid-connected VSCs, which not only shows close correlations with the generalized Nyquist criterion for MIMO systems but also enables to quantify the stability margins of individual closed loops. Moreover, the interactions between the closed loops can be analyzed. Test cases with numerical sensitivity analysis, simulations, and field measurements of a converter validate the theory.
KW - Generalized Nyquist stability criterion (GNC)
KW - Grid-connected voltage-source converters (VSCs)
KW - Loop-at-a-time (LAAT)
KW - Multiple-input-multiple-output (MIMO)
KW - Single-input-single-output (SISO)
UR - http://www.scopus.com/inward/record.url?scp=85116582472&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2020.3024103
DO - 10.1109/JESTPE.2020.3024103
M3 - Journal article
SN - 2168-6777
VL - 9
SP - 5807
EP - 5821
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 5
ER -