TY - GEN
T1 - Virtual Energy Storage Operation for Smart Photovoltaic Inverters
AU - Yang, Yongheng
AU - Xiao, Yi
AU - Peng, Qiao
AU - Blaabjerg, Frede
AU - Wu, Yingzi
AU - Ji, Xiaotong
PY - 2022/6
Y1 - 2022/6
N2 - Inverter-based resources (IBR) are increasingly adopted and becoming the dominant electricity generation sources in today’s power systems. This may require a "bottom-up" change of the operation and control of the employed power inverters, e.g., based on the emerging grid-forming technology and by integrating energy storage. Currently, grid-following and grid-forming inverters are simultaneously seen in power systems, while mostly as demonstration small-scale or medium-scale cases. As such, grid-following inverters should become much smarter and be able to provide various functions to support the power grid in response to static and dynamic disturbances. In this paper, the photovoltaic (PV) inverters are considered to operate as virtual energy storage (VES) to flexibly provide grid support, e.g., short-term frequency control to improve the frequency quality, in the context of more IBR-based power systems. More specifically, the PV inverters are dynamically regulating the active power to "store" or "release" energy to the grid, mimicking the operation of a physical energy storage system. In addition to the grid support, the VES operation can also improve the inverter reliability, and increase the utilization ratio of PV inverters to some extent. Simulation and experimental case studies are presented to demonstrate the VES operation of PV inverters and its effectiveness of inertia support.
AB - Inverter-based resources (IBR) are increasingly adopted and becoming the dominant electricity generation sources in today’s power systems. This may require a "bottom-up" change of the operation and control of the employed power inverters, e.g., based on the emerging grid-forming technology and by integrating energy storage. Currently, grid-following and grid-forming inverters are simultaneously seen in power systems, while mostly as demonstration small-scale or medium-scale cases. As such, grid-following inverters should become much smarter and be able to provide various functions to support the power grid in response to static and dynamic disturbances. In this paper, the photovoltaic (PV) inverters are considered to operate as virtual energy storage (VES) to flexibly provide grid support, e.g., short-term frequency control to improve the frequency quality, in the context of more IBR-based power systems. More specifically, the PV inverters are dynamically regulating the active power to "store" or "release" energy to the grid, mimicking the operation of a physical energy storage system. In addition to the grid support, the VES operation can also improve the inverter reliability, and increase the utilization ratio of PV inverters to some extent. Simulation and experimental case studies are presented to demonstrate the VES operation of PV inverters and its effectiveness of inertia support.
KW - Inverter-based resources
KW - Photovoltaic inverters
KW - Grid frequency support
KW - Energy storage
KW - Inertia
U2 - 10.1109/PEDG54999.2022.9923090
DO - 10.1109/PEDG54999.2022.9923090
M3 - Article in proceeding
SN - 978-1-6654-6619-6
T3 - IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
SP - 1
EP - 6
BT - Proceedings of the 2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
PB - IEEE (Institute of Electrical and Electronics Engineers)
T2 - 13th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2022
Y2 - 26 June 2022 through 29 June 2022
ER -