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Converter-grid interaction is of great interest in a weak-grid condition. This paper presents a single-input-single-output (SISO) open-loop transfer function for the stability analysis of grid-connected voltage-source converters. Differing from the conventional input impedance method and the eigenvalue analysis, an alternative multi-input-multi-output closed-loop system is developed in the paper and it eventually yields an SISO open-loop transfer function. This enables the application of a single Nyquist curve for analyzing the overall system stability. The model is validated against time-domain simulations as well as experimental results showing excellent accuracy for predicting the system stability.
- Multi-input-multi-output (MIMO)
- Nyquist stability criterion
- Single-input-single-output (SISO)
- Voltage-source converter (VSC)
- Weak grid
Zhang, H., Wang, X., Harnefors, L., Gong, H., Hasler, J. P., & Nee, H. P. (2019). SISO Transfer Functions for Stability Analysis of Grid-Connected Voltage-Source Converters. IEEE Transactions on Industry Applications, 55(3), 2931-2941. . https://doi.org/10.1109/TIA.2019.2898978