TY - JOUR
T1 - Novel Virtual Impedance Compensation Algorithm for Operation Stabilization of 3P4L3L PV-BES Microgrids With Constant Power Loads
AU - Zhu, Yi
AU - Wen, Huiqing
AU - Yang, Yong
AU - Wen, Caifeng
AU - Mao, Jianliang
AU - Wang, Pan
AU - Hu, Yihua
AU - Garcia, Cristian
AU - Rodriguez, Jose
N1 - Publisher Copyright:
© 2010-2012 IEEE.
PY - 2025
Y1 - 2025
N2 - A hybrid microgrid system that includes photovoltaic (PV) panels, battery energy storages (BESs), and constant power loads (CPLs) is presented in this article, where three-phase four-leg three-level (3P4L3L) is utilized as the main power interface. As the penetration of CPLs increases significantly, the operational stability of PV-BES Microgrids has become one of the most challenging issues. To tackle this issue, this paper proposes virtual impedance compensation methods to prevent the instability and oscillations caused by CPLs. First, the small-signal model of main power interfaces, especially 3P4L3L converters and CPLs, is built. Then, the stability of the cascaded system is investigated using the Nyquist criterion. Two compensation strategies are proposed based on the derived small-signal model, and the two methods are analyzed and compared in terms of the stability margin. Experiments are performed to prove the feasibility of the proposed strategy, and the results show that the virtual impedance compensation can prevent instability in 3P4L3L PV-BES Microgrids with high penetration of CPLs.
AB - A hybrid microgrid system that includes photovoltaic (PV) panels, battery energy storages (BESs), and constant power loads (CPLs) is presented in this article, where three-phase four-leg three-level (3P4L3L) is utilized as the main power interface. As the penetration of CPLs increases significantly, the operational stability of PV-BES Microgrids has become one of the most challenging issues. To tackle this issue, this paper proposes virtual impedance compensation methods to prevent the instability and oscillations caused by CPLs. First, the small-signal model of main power interfaces, especially 3P4L3L converters and CPLs, is built. Then, the stability of the cascaded system is investigated using the Nyquist criterion. Two compensation strategies are proposed based on the derived small-signal model, and the two methods are analyzed and compared in terms of the stability margin. Experiments are performed to prove the feasibility of the proposed strategy, and the results show that the virtual impedance compensation can prevent instability in 3P4L3L PV-BES Microgrids with high penetration of CPLs.
KW - output impedance shaping
KW - PV-BES microgrids
KW - stability
KW - virtual impedance compensation
UR - http://www.scopus.com/inward/record.url?scp=105001209486&partnerID=8YFLogxK
U2 - 10.1109/TSTE.2025.3529987
DO - 10.1109/TSTE.2025.3529987
M3 - Article
AN - SCOPUS:105001209486
SN - 1949-3029
VL - 16
SP - 1401
EP - 1413
JO - IEEE Transactions on Sustainable Energy
JF - IEEE Transactions on Sustainable Energy
IS - 2
ER -