Abstract
A small disturbance math model of direct drive wind turbine including phase-locked loop (PLL) and voltage feed-forward control is established in the paper, and the dynamic impedance analytical expression under dq axis is derived. Based on the analysis method of frequency-equivalent impedance, it is found that the impedance has negative resistance (negative real part) characteristics in the sub-synchronous frequency band. Key control parameters and their characteristics which influence stability are analyzed.
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Acknowledgements
This work was supported by State Grid Inner Mongolia Eastern Power Co. Ltd Project “Research on Risk Analysis and Defense Technology of Sub-synchronous Oscillation in Large-scale UHV Wind Power Transmission Network” (No. SGMD0000DDJS1701168), thanks.
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Wan, Y., Xiang, S., Zhu, L., Ding, Z., Liu, F., Liu, X. (2020). Key Parameters Analysis of Sub-synchronous Oscillation Caused by Interaction Between Full-Converter Wind Turbines and AC Systems. In: Xue, Y., Zheng, Y., Rahman, S. (eds) Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control. PMF PMF 2019 2021. Lecture Notes in Electrical Engineering, vol 584. Springer, Singapore. https://doi.org/10.1007/978-981-13-9779-0_12
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DOI: https://doi.org/10.1007/978-981-13-9779-0_12
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