Application of Envelope-Following Techniques to the Simulation of Hybrid Power Systems

Abstract

The dynamics of modern hybrid power systems are characterized by behaviors at different timescales, typically separated by several orders of magnitude. In this paper we apply the envelope-following method to hybrid power systems simulations, in which single-phase and three-phase representations of a power system co-occur. This simulation method is well suited for handling coexisting behaviors occurring at different timescales. Compared to the simulation approaches present in the literature, the envelope-following method does not need to continuously switch between two separate simulation engines, but rather automatically handles instantaneous variations in the dynamics of the system, such as faults or topology changes. Additionally, given the vast penetration of power electronic components in modern electricity networks, employing the envelope-following method allows using a vast array of numerical algorithms that have been developed over the years to simulate electrical and electronic circuits. The proposed approach is validated by means of power systems case studies of increasing complexity.

Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids

“…We believe that a more promising approach in this regard consists in suitably mixing single-phase dynamic models and accurate three-phase EMT models to perform hybrid phasor-EMT numerical analyses, thereby achieving a proper compromise between simulation speed and accuracy [54]. The former could represent non-critical parts of the grids (i.e., conventional power grids), while the latter could account for the critical ones (i.e., those comprising large shares of IBRs).…”