Impedance and Damping Characteristics of Grid-Connected VSCs With Power Synchronization Control Strategy


Modeling and analysis of the output impedance of a grid-connected voltage-sourced converter (VSC)-primarily based system under the recently-developed power synchronization management topology is presented in this paper. The impact of impedance passivity on subsynchronous damping profile of an electrically-nearby synchronous generator is then characterised. The impacts of key factors such as management modes and management parameter are addressed. A comparison with the standard vector management strategy is additionally presented. The results reveal that under this sort of management, a VSC does not have negative impact on sub-synchronous dynamics; on the contrary, it has a positive impact, compared with commonly used vector current control where the latter incorporates a potential to degrade the system damping. Time-domain simulation results are presented to validate the theoretical analysis.

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