TY - JOUR
T1 - DC-Link Voltage Control Aided for the Inertial Support during Severe Faults in Weak Grids
AU - Khayat, Yousef
AU - Golestan, Saeed
AU - Guerrero, Josep M.
AU - Vasquez, Juan C.
AU - Bevrani, Hassan
N1 - Funding Information:
This work was supported by the Department of Energy Technology, Aalborg University, under the Villum Investigator Grant 25920 as a part of the Villum Investigator Program CROM funded by the Villum Foundation. Recommended for publication by Associate Editor Ahmed Massoud.
Publisher Copyright:
© 2013 IEEE.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - Keeping the synchronization of a grid feeding converter (GFC) with a weak grid during deep voltage sags has been introduced as a serious challenge in converter-interfaced renewable energy source-dominated weak grids. To deal with this challenge, a simple yet effective solution based on the virtual inertia concept is proposed in this article. This method is realized by adding a correction term to the dc-link voltage controller, which adjusts the active and reactive current set points and enables the converter to remain synchronized to the grid during severe faults. Closed-loop dynamics of the system in the presence of the parametric uncertainty of the grid-side impedance has been studied, in both normal and fault conditions with different voltage drops. Along these, system performance has been investigated, and in comparison with previous methods, it is revealed that the direct inertial support gain may possibly cause instability and do not propose a stable synchronization process to the GFC under deep faults. The performance of the proposed method has been verified by real-time laboratory results for different resistive/inductive weak grids with various levels of voltage sags. Real-time verification demonstrates the effectiveness of the proposed control in stabilizing GFCs for inertia emulation and its role in a better synchrony process.
AB - Keeping the synchronization of a grid feeding converter (GFC) with a weak grid during deep voltage sags has been introduced as a serious challenge in converter-interfaced renewable energy source-dominated weak grids. To deal with this challenge, a simple yet effective solution based on the virtual inertia concept is proposed in this article. This method is realized by adding a correction term to the dc-link voltage controller, which adjusts the active and reactive current set points and enables the converter to remain synchronized to the grid during severe faults. Closed-loop dynamics of the system in the presence of the parametric uncertainty of the grid-side impedance has been studied, in both normal and fault conditions with different voltage drops. Along these, system performance has been investigated, and in comparison with previous methods, it is revealed that the direct inertial support gain may possibly cause instability and do not propose a stable synchronization process to the GFC under deep faults. The performance of the proposed method has been verified by real-time laboratory results for different resistive/inductive weak grids with various levels of voltage sags. Real-time verification demonstrates the effectiveness of the proposed control in stabilizing GFCs for inertia emulation and its role in a better synchrony process.
KW - Fault ride through capability
KW - grid feeding converters (GFCs)
KW - loss of synchronization
KW - vector current control
KW - virtual inertia
UR - http://www.scopus.com/inward/record.url?scp=85111655595&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2020.3033657
DO - 10.1109/JESTPE.2020.3033657
M3 - Journal article
AN - SCOPUS:85111655595
SN - 2168-6777
VL - 9
SP - 7296
EP - 7305
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 6
ER -