Enhanced single-phase phase locked loop based on complex-coefficient filter

Article

Gautam, Samir, Xiao, Weidong, Ahmad, Hafiz and Lu, Dylan Dah-Chuan. 2022. "Enhanced single-phase phase locked loop based on complex-coefficient filter." IEEE Transactions on Instrumentation and Measurement. 71. https://doi.org/10.1109/TIM.2022.3147891
Article Title

Enhanced single-phase phase locked loop based on complex-coefficient filter

ERA Journal ID979
Article CategoryArticle
AuthorsGautam, Samir, Xiao, Weidong, Ahmad, Hafiz and Lu, Dylan Dah-Chuan
Journal TitleIEEE Transactions on Instrumentation and Measurement
Journal Citation71
Article Number9001408
Number of Pages8
Year2022
PublisherIEEE (Institute of Electrical and Electronics Engineers)
Place of PublicationUnited States
ISSN0018-9456
1557-9662
Digital Object Identifier (DOI)https://doi.org/10.1109/TIM.2022.3147891
Web Address (URL)https://ieeexplore.ieee.org/document/9698020
Abstract

Complex coefficient filters (CCFs) are widely used for phase-locked loop (PLL) in three-phase power systems, while its usage is largely sparse in the single-phase domain. Single-phase CCF-PLLs so far reported in the literature do not yield satisfactory performances at off-nominal frequency conditions, which is a crucial PLL attribute. Whether they are a suitable filtering technique of choice for single-phase PLL is yet to be formally documented in a methodological way. In this regard, this article derives an enhanced version of the single-phase CCF-PLL (ECCF-PLL), which is able to provide accurate estimation of grid parameters in dynamically changing grid frequency environment. The proposed ECCF-PLL is then numerically and experimentally compared with few other single-phase PLLs to gauge its efficacy and suitability. The test shows the advantage of harmonic robustness from ECCF-PLL, which is specifically useful in a weak grid.

KeywordsComplex coefficient filter (CCF); grid interconnection; phase locked loop (PLL); single-phase system; synchronization
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400803. Electrical energy generation (incl. renewables, excl. photovoltaics)
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Byline AffiliationsUniversity of Sydney
Bangor University, United Kingdom
University of Technology Sydney
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