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Recently, subsynchronous interaction (SSI), a type of stability issue caused by interactionsbetween power electronic converters and weak grids, has attracted greatconcerns. Many efforts have been made to use impedance/admittance‐based methodsfor its modelling and analysis. However, most impedance/admittance models(IM/AMs) are aimed at higher‐frequency dynamics and do not reflect the couplingeffects between sub‐ and super‐synchronous frequencies or the outer controlloops, which, as indicated in this work, have significant impacts on thecharacteristics of SSI. To fill the gap, this study derives the explicitfrequency‐coupled AM for a typical grid‐tied voltage‐sourced converter by takingthe coupling effects and outer‐loop controls into full account and furtherinvestigates their impacts on the subsynchronous stability. The model itself andits effectiveness in predicting the stability of SSI have been validated withdetailed electromagnetic transient simulations.
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Liu et al. (2018) studied this question.
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