TY - JOUR
T1 - Control of Grid-Forming VSCs
T2 - A Perspective of Adaptive Fast/Slow Internal Voltage Source
AU - Wu, Heng
AU - Wang, Xiongfei
PY - 2023/8/1
Y1 - 2023/8/1
N2 - Grid-forming (GFM) capability requirements are increasingly imposed on grid-connected voltage-source converters (VSCs). Under large grid disturbances, GFM-VSCs need to remain stable while providing GFM services. Yet, such objectives, as pointed out in this article, inherently lead to conflicting requirements on the dynamics of the internal voltage source (IVS) of GFM-VSCs, i.e., the fast IVS dynamics is needed to avoid the loss of synchronism with the grid, whereas the slow IVS dynamics is preferred for maintaining GFM capability. To tackle this challenge, an adaptive fast/slow IVS control is proposed, which switches GFM-VSC between fast and slow IVS dynamics based on system needs. The proposed method enhances the transient stability of GFM-VSC while maximizing its capability of providing GFM service. Further, the approach is robust to different grid strengths and different types of grid disturbances. The experimental results verify the theoretical findings and the effectiveness of the proposed control method.
AB - Grid-forming (GFM) capability requirements are increasingly imposed on grid-connected voltage-source converters (VSCs). Under large grid disturbances, GFM-VSCs need to remain stable while providing GFM services. Yet, such objectives, as pointed out in this article, inherently lead to conflicting requirements on the dynamics of the internal voltage source (IVS) of GFM-VSCs, i.e., the fast IVS dynamics is needed to avoid the loss of synchronism with the grid, whereas the slow IVS dynamics is preferred for maintaining GFM capability. To tackle this challenge, an adaptive fast/slow IVS control is proposed, which switches GFM-VSC between fast and slow IVS dynamics based on system needs. The proposed method enhances the transient stability of GFM-VSC while maximizing its capability of providing GFM service. Further, the approach is robust to different grid strengths and different types of grid disturbances. The experimental results verify the theoretical findings and the effectiveness of the proposed control method.
KW - Grid-forming
KW - Impedance
KW - Power control
KW - Power system dynamics
KW - Power system stability
KW - Stability criteria
KW - Transient analysis
KW - Voltage control
KW - robustness
KW - transient stability
KW - voltage-source converters
KW - Grid-forming (GFM)
KW - voltage-source converters (VSCs)
UR - http://www.scopus.com/inward/record.url?scp=85153488215&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2023.3268374
DO - 10.1109/TPEL.2023.3268374
M3 - Journal article
SN - 0885-8993
VL - 38
SP - 10151
EP - 10169
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 8
ER -