Digital implementation methods for grid synchronization using an integrated filter

Yongsoon Park; Dong-Hyun Moon; Geon Heo

Digital implementation methods for grid synchronization using an integrated filter

Yongsoon Park

Dong-Hyun Moon

Geon Heo

Vol. 20, No. 5, pp. 1261-1272, Sep. 2020

10.1007/s43236-020-00115-6

Discrete time

Frequency estimation

Grid synchronization

Numerical integration

Signal processing

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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Cite this article

[IEEE Style]

Y. Park, D. Moon, G. Heo, "Digital implementation methods for grid synchronization using an integrated filter," Journal of Power Electronics, vol. 20, no. 5, pp. 1261-1272, 2020. DOI: 10.1007/s43236-020-00115-6.

[ACM Style]

Yongsoon Park, Dong-Hyun Moon, and Geon Heo. 2020. Digital implementation methods for grid synchronization using an integrated filter. Journal of Power Electronics, 20, 5, (2020), 1261-1272. DOI: 10.1007/s43236-020-00115-6.