Abstract
The synchronization of grid converters through phase-locked loop (PLL) could cause stability issues especially when the penetration of grid converters is high. Most of the works in the literature consider all the grid converters with identical system parameters. In contrast, this paper aims at studying the stability issues of two PLL-synchronized grid converters with different PLL bandwidths and power injections and revealing the interactions between two converters caused by the band-width and power differences. Moreover, the relationship between power injection and PLL bandwidth of the grid converter is investigated. For these studies, a state-space model based on the component connection method (CCM) is developed, which is scalable for the power system with large numbers of grid converters. Eigenvalue-based analysis is carried out to study the grid converters’ interactions as well as power/bandwidth relation under various scenarios. Experimental results are given to validate the effectiveness of the model and theoretical analysis.
Published Version
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