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Modern power systems are transitioning from centralized fossil-fuel-based generation to distributed renewable energy generation, where renewable energies are coupled to the grid through grid-tied converters. Grid-forming converters (GFMCs) have emerged as an enabling technology, especially for single-phase applications.
Existing modeling approaches, such as impedance and state-space modeling, have limitations in accurately describing the dynamics of single-phase GFMCs. The dynamics of the nonlinear orthogonal signal generation unit, crucial for power measurement, have been ignored in previous models, leading to inaccuracies.
The letter proposes a dynamic phasor model of single-phase GFMCs that captures the dynamics of the orthogonal signal generation unit. The model is derived rigorously and linearized for small-signal stability analysis.
The stability analysis using the proposed model reveals that some eigenvalues are located in the right half plane, indicating system instability, which is not captured by existing models. This demonstrates the improved accuracy of the proposed dynamic phasor model.
Experimental results validate the accuracy of the proposed dynamic phasor model, showing that the single-phase GFMC operates unstably with a low damping coefficient (Dg = 4) and stably with a higher damping coefficient (Dg = 10), consistent with the theoretical analysis.
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by Wenjia Si,Ch... at arxiv.org 04-18-2024
https://arxiv.org/pdf/2404.11304.pdfDeeper Inquiries