Improved current reference calculation for MMCs internal energy balancing control
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hdl:2117/364954
Tipus de documentArticle
Data publicació2021-06-22
EditorInstitute of Electrical and Electronics Engineers (IEEE)
Condicions d'accésAccés obert
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Abstract
The paper addresses an improved inner current reference calculation to be employed in the control of modular multilevel converters operating during either balanced or unbalanced conditions. The suggested reference calculation is derived based on the AC and DC additive and differential voltage components applied to the upper and lower arms of the converter. In addition, the impacts caused not only by the AC networks impedances but also by the MMCs arm impedances are also considered during the derivation of the AC additive current reference expressions. Another issue discussed in this article regards that singular voltage conditions, where the positive-sequence component is equal to the negative one, may occur not only in the AC network but also internally (within the converters applied voltages). Several different inner current reference calculation methods are compared and their applicability during the former fault conditions is analyzed. The paper presents a detailed formulation of the inner current reference calculation and applies it to different unbalanced AC grid faults where it is shown that the presented approach can be potentially used to maintain the internal energy of the converter balanced during normal and fault conditions.
Descripció
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CitacióSpier, W.D. [et al.]. Improved current reference calculation for MMCs internal energy balancing control. "IEEE transactions on power delivery", 22 Juny 2021,
ISSN0885-8977
Versió de l'editorhttps://ieeexplore.ieee.org/document/9462328
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Improved_control_strategy_DSPIER.pdf | Main Article | 4,367Mb | Visualitza/Obre |