A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions

Long-Yue Yang; Chong-Lin Wang; Jian-Hua Liu; Chen-Xi Jia

A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions

Vol. 15, No. 1, pp. 216-226, Jan. 2015

10.6113/JPE.2015.15.1.216

Frequency estimation

Orthogonal Signal Generator (OSG)

Phase locked loop (PLL)

Synchronization

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Abstract

Grid synchronization is one of the key techniques for the grid-connected power converters used in distributed power generation systems. In order to achieve fast and accurate grid synchronization, a new phase locked loop (PLL) is proposed on the basis of the complex filter matrixes (CFM) orthogonal signal generator (OSG) crossing-decoupling method. By combining first-order complex filters with relation matrixes of positive and negative sequence voltage components, the OSG is designed to extract specific frequency orthogonal signals. Then, the OSG mathematical model is built in the frequency-domain and time-domain to analyze the spectral characteristics. Moreover, a crossing-decoupling method is suggested to decouple the fundamental voltage. From the eigenvalue analysis point of view, the stability and dynamic performance of the new PLL method is evaluated. Meanwhile, the digital implementation method is also provided. Finally, the effectiveness of the proposed method is verified by experiments under unbalanced and distorted grid voltage conditions.

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Cite this article

[IEEE Style]

L. Yang, C. Wang, J. Liu, C. Jia, "A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions," Journal of Power Electronics, vol. 15, no. 1, pp. 216-226, 2015. DOI: 10.6113/JPE.2015.15.1.216.

[ACM Style]

Long-Yue Yang, Chong-Lin Wang, Jian-Hua Liu, and Chen-Xi Jia. 2015. A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions. Journal of Power Electronics, 15, 1, (2015), 216-226. DOI: 10.6113/JPE.2015.15.1.216.