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Low voltage ride-through control strategy for virtual synchronous generators based on virtual self-inductive flux linkage

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Abstract

Virtual synchronous generators (VSGs), with the operational characteristics of synchronous generators (SGs), have been employed in renewable energy generation grid-connected systems to solve the problem of insufficient equivalent inertia, which is caused by the high permeability of distributed generation systems in the grid. However, a VSG does not possess low voltage ride-through (LVRT) capability. A novel LVRT control strategy for a VSG based on virtual self-inductive flux linkage is proposed in this paper. First, the electromagnetic transient response mechanism of a SG under grid faults is analyzed in detail. Then, a memory and retention strategy are proposed to simulate the effect of the switch law. Furthermore, the virtual q-axis armature self-inductance is introduced into the VSG and a virtual self-inductive magnetic chain is utilized to block the change of the transient fault current. This helps the inverter adjust the output voltage quickly. In addition, under the premise of meeting the reactive power margin, the reactive power compensation strategy is optimized to achieve a quick response in terms of the reactive power compensation of grid faults, which is helpful for realizing the LVRT of a VSG. Finally, the feasibility and effectiveness of the proposed LVRT method are verified by thorough simulation results.

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Data availability

Datasets related to this article can be found at http://dx.doi.org/10.17632/swctzr6gk8.1, an open-source online data repository hosted at Mendeley Data (Shi, Kai; Li, Tong; Ren, Mingwei; Xu, Peifeng 2020).

Code availability

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant 51407085, in part by National Key R&D Program of China under Grant 2017YFB0103200, and in part by the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution.

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China

    Kai Shi, Tong Li, Mingwei Ren & Peifeng Xu

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  1. Kai Shi
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  2. Tong Li
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  3. Mingwei Ren
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Corresponding author

Correspondence to Mingwei Ren.

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The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper.

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Shi, K., Li, T., Ren, M. et al. Low voltage ride-through control strategy for virtual synchronous generators based on virtual self-inductive flux linkage. J. Power Electron. 21, 815–828 (2021). https://doi.org/10.1007/s43236-021-00229-5

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  • DOI: https://doi.org/10.1007/s43236-021-00229-5

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