TY - JOUR
T1 - Low-Frequency Passivity-Based Analysis and Damping of Power-Synchronization Controlled Grid-Forming Inverter
AU - Zhao, Fangzhou
AU - Wang, Xiongfei
AU - Zhu, Tianhua
PY - 2023/4/1
Y1 - 2023/4/1
N2 - This article presents a passivity-based analysis and damping method for the low-frequency dynamics of grid-forming (GFM) control. A closed-form analytical solution to the positive realness of control input admittance is developed, which reveals the inherent nonpassive property of GFM control. This feature gives rise to the risk of instability, especially in connection with a nearby nonpassive GFM inverter, which may induce undesired control interactions. It is further revealed that the passivity index is determined by a low-frequency resonance around 10 Hz in the dq -frame, and this resonance can be better dampened, therefore, with enhanced passivity index, by using a virtual reactance (VRA) than using a virtual resistance (VRS). Finally, the theoretical findings are verified by the experimental results.
AB - This article presents a passivity-based analysis and damping method for the low-frequency dynamics of grid-forming (GFM) control. A closed-form analytical solution to the positive realness of control input admittance is developed, which reveals the inherent nonpassive property of GFM control. This feature gives rise to the risk of instability, especially in connection with a nearby nonpassive GFM inverter, which may induce undesired control interactions. It is further revealed that the passivity index is determined by a low-frequency resonance around 10 Hz in the dq -frame, and this resonance can be better dampened, therefore, with enhanced passivity index, by using a virtual reactance (VRA) than using a virtual resistance (VRS). Finally, the theoretical findings are verified by the experimental results.
KW - Admittance
KW - Eigenvalues and eigenfunctions
KW - Frequency control
KW - Grid-forming inverter
KW - Indexes
KW - Inverters
KW - Resistance
KW - Synchronization
KW - passivity index
KW - stability
KW - virtual reactance
KW - Grid-forming (GFM) inverter
KW - virtual reactance (VRA)
UR - http://www.scopus.com/inward/record.url?scp=85141599196&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2022.3218845
DO - 10.1109/JESTPE.2022.3218845
M3 - Journal article
SN - 2168-6777
VL - 11
SP - 1542
EP - 1554
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 2
ER -