A Seamless Transition between Grid-Forming and Grid-Following Controls of Inverter-Based Resources
Heqing Huang, Lizhi Ding, Yuzhang Lin, Xiaonan Lu, Yue Zheng · 2024
A universal method for seamless, bidirectional transition between grid-forming and grid-following modes of inverter-based resources is presented in this paper. In this method, both control modes operate simultaneously, with one being active while the other remains on standby. By leveraging the interchangeability between controlled voltage source and controlled current source, the control reference of the standby mode is adjusted to track the active control mode. Once the system reaches the steady state, the outputs of both control modes are synchronized, allowing for an instantaneous and seamless transition between control modes when needed.