To address the stability concerns for a system having high renewable penetration level, this project has been funded by the Department of Energy’s Office of Electricity through Advanced Grid Modeling program to develop a new set of analytical methods suitable for the future power systems grid, consisting of ultra-high penetration of IBRs. These new analytical methods will be designed to include the new phenomenon, such as high-frequency dynamics, reduced system strength, and reduced short circuit current, that will be observed in the future grid. The objectives of this project are:

1. Identify gaps in applying conventional analytics approaches used in steady-state, dynamic simulations and short circuit analysis in a grid with ultra-high IBR penetration
2. Develop a model of the power system network around the suggested wind and solar units and inverter models with as much detail as technically possible in the Power System Computer Aided Design (PSCAD)/simulation environment, E-Tran, and PSS/E
3. Develop new steady-state and dynamic analytical approaches for a system having an ultra-high renewable penetration level that overcomes the identified gaps
4. Develop new algorithms for short circuit calculations and protection coordination between IBRs, transmission, and loads
5. Examine newly proposed steady-state and transient stability analytical approaches on a system having an ultra-high renewable penetration level
6. Perform sub-synchronous resonance (SSR) and sub-synchronous control interaction (SSCI) studies using the PSCAD simulation environment
7. Develop controls and interconnection requirements that allow reliable operation of large AC transmission systems with very few synchronous machines
8. Investigate the role of synchronous condensers in supporting high IBR penetration.