Unified Modular State-Space Modeling of Grid-Connected Voltage-Source Converters

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Abstract

This article proposes a modular state-space modeling framework for grid-connected voltage-source converters, where the different control loops, including the ac current control, the phase-locked loop, the dc-link voltage control, and the ac voltage magnitude control, can be modeled separately as building blocks. Moreover, the mathematical relationship between state-space models in the rotating (dq-) frame and the stationary (αβ-) frame is explicitly established, and, thus, the modal analysis can be performed directly in the αβ-frame, which allows intuitive interpretation of voltage and current oscillation modes in the αβ-frame. Experimental tests of a 3-kW back-to-back converter system validate the effectiveness of the unified modular state-space modeling and analysis.

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Yang, D., & Wang, X. (2020). Unified Modular State-Space Modeling of Grid-Connected Voltage-Source Converters. IEEE Transactions on Power Electronics, 35(9), 9702–9717. https://doi.org/10.1109/TPEL.2020.2965941

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