Improvement of the Interface Models of a Per-Phase Phasor/EMT Co-Simulation Platform for Studying Transients and Dynamics in Distribution Grids With IBRs

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Abstract
Co-simulation offers a time-efficient method for ac-curately analyzing the behavior of distribution systems dominated by inverter-based resources (IBRs). However, most co-simulation studies in the literature overlook distribution grids. Additionally, these studies do not discuss practical IBR models nor how to ini-tialize the interface model variables of co-simulation platforms. To obtain co-simulation results that are reasonably accurate for dis-tribution system-based planning and operation, it is pertinent to develop co-simulation platforms well-suited for studying the accu-rate behavior of IBRs coupled to unbalanced distribution grids. This paper introduces an initialization algorithm for initializing the interface model variables of co-simulation platforms. The ini-tialization algorithm is anchored on leveraging the fast execution speed of the per-phase phasor simulation to quickly pre-calculate initial values of interface model variables prior to starting co-sim-ulation. This paper further proposes the inclusion of rate limiters in the co-simulation platforms interface models to prevent the in-capability of the per-phase phasor simulator to clear faults at zero-crossing of currents from falsely impacting the control system of practical IBR models. The proposed methods are validated by benchmarking the results from a per-phase phasor/electromag-netic transient (EMT) co-simulation of an IBRs-dominated IEEE 34-Node test feeder against the results from a full EMT simulation.
Funding Information
  • Pacific Northwest National Laboratory (PNNL) is operated by Battelle for the U.S. Department of Energy (DE-AC05-76RL01830)
  • U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office (38453, DE-EE0010424)

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