Synchronizing Interactions Between Different Types of Grid-Forming Converters in Smart Grids

The work investigates the transient synchronizing interactions between different types of grid-forming controls. Two well-known grid-forming schemes are implemented and considered for analysis: a droop-based control and a swingbased control. The two controls are examined for a temporary loss of synchronism. The analysis is performed considering two different conditions for the grid interconnecting the converters: a resistive-inductive grid and a mainly inductive grid. The first case corresponds to actual conditions in low and medium voltage applications. The second case is realized with the implementation of a virtual reactance in the grid-forming control scheme. The analysis of the results provides a specific insight on the characteristics of the synchronizing interactions between the different types of grid-forming converters, indicating the possibility of steep reactions, mutual oscillations and unsymmetrical interactions.

Automated summary

This work investigates the transient synchronizing interactions between different types of grid-forming controls. It examines two well-known grid-forming schemes, a droop-based control and a swing-based control, under different grid conditions. The analysis reveals the possibility of steep reactions, mutual oscillations, and unsymmetrical interactions between the different types of grid-forming converters.