Abstract
The inverter-based resource (IBR) has become a very important component in the distribution system. The impacts on system transient stability introduced by high IBR penetration are not fully addressed because of the lack of high-fidelity models. The aggregate IBR model at the transmission level cannot precisely reproduce the dynamics of distributed IBRs at the distribution system because of the oversimplification. In this paper, we will develop a high-penetration fully-connected transmission and distribution (T&D) co-simulation platform that supports the dynamic simulation of 10,000+ dispersed IBR models. A new iterative T&D power flow initialization technique has been proposed to maintain stable transition from power flow to dynamic co-simulation mode with a large multitude of IBR models. This paper also initiates the study to investigate the impacts of advanced phasor-domain IBR models with grid-forming (GFM) and grid-following (GFL) control on the dynamics of large-scale T&D network. The co-simulation platform is developed and tested on high-performance computing (HPC) resources to facilitate parallel simulation.
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