Developing a Reduced 240-Bus WECC Dynamic Model for Frequency Response Study of High Renewable Integration: Preprint

The ongoing generation resource mix change, driven by rapid adoption of inverter-based resources (IBR) and early retirement of synchronous generators (SG), is bringing new challenges to the planning and operation of bulk electric systems. Consequently, there is an increasing need to understand, design, and quantify the reliability service provision from IBRs by performing integrated scheduling and dynamic simulations. However, test systems that have consistent scheduling and dynamic models rarely exist largely due to the decoupled nature of the two simulations on the SG-dominated system. Based on an existing scheduling model, this work develops a reduced Western Electricity Coordinating Council (WECC) model that is suitable for integrated scheduling and dynamic simulations. The reduced 240-Bus WECC model reflects the generation resource mix of the Western Interconnection as of 2018 including the generation cost data for scheduling. Moreover, the developed dynamic model is validated against field frequency events measured by FNET/GridEye and preserves the dominant inter-area oscillation mode in the WECC