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Digital implementation methods for grid synchronization using an integrated filter

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Abstract

The steady rise in the deployment of grid-connected inverters is driving a need for more efficient and accurate grid synchronization techniques. In this paper, digital implementation methods are proposed to increase grid synchronization accuracy when an integrated filter is used. First, a method to compensate for the computational delays in the implementation of integrated filters with numerical integrations is presented. Second, a simple method to estimate the grid frequency is introduced for updating the center frequency of integrated filters. The proposed methods have been implemented in a digital signal processor and tested with a real-time simulator. They achieve ripple errors of 0.14 mHz and 0.008° in the frequency and phase angle estimations, respectively.

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Acknowledgements

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20181210301380).

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Authors and Affiliations

  1. School of Integrated Technology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea

    Yongsoon Park, Dong-Hyun Moon & Geon Heo

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  1. Yongsoon Park
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  2. Dong-Hyun Moon
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  3. Geon Heo
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Correspondence to Yongsoon Park.

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Park, Y., Moon, DH. & Heo, G. Digital implementation methods for grid synchronization using an integrated filter. J. Power Electron. 20, 1261–1272 (2020). https://doi.org/10.1007/s43236-020-00115-6

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  • DOI: https://doi.org/10.1007/s43236-020-00115-6

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