Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition

Article

Gautam, Samir, Lu, Yuezhu, Hassan, Waqas, Xiao, Weidong and Lu, Dylan Dah-Chuan. 2020. "Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition." Electric Power Systems Research. 180. https://doi.org/10.1016/j.epsr.2019.106156
Article Title

Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition

ERA Journal ID4408
Article CategoryArticle
AuthorsGautam, Samir, Lu, Yuezhu, Hassan, Waqas, Xiao, Weidong and Lu, Dylan Dah-Chuan
Journal TitleElectric Power Systems Research
Journal Citation180
Article Number106156
Number of Pages10
Year2020
PublisherElsevier
Place of PublicationNetherlands
ISSN0378-7796
1873-2046
Digital Object Identifier (DOI)https://doi.org/10.1016/j.epsr.2019.106156
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0378779619304754
Abstract

Non-frequency-dependent transfer delay (NTD) approach is one of the simplest and the fastest solution for single-phase AC systems to achieve phase-locked loops (PLLs). It also exhibits immunity to error in estimated quantities in grid frequency variations. However it is susceptible to grid voltage disturbances, such as DC offset and distortions. This paper proposed an improved NTD scheme to achieve both fast dynamic response and operational robustness against abnormal grid conditions. The solution is based on a digital phase lead compensator (PLC), which is cascaded with the MAF inside the PLL control loop to enhance dynamic response and mitigate disturbance, DC offset, and harmonics. The filtering structure is also designed to be adaptive to grid frequency variations. The effectiveness of the proposed solution is verified via simulation and experimental results.

KeywordsPhase locked loop; Single phase; Moving average filter; Phase lead compensator
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20204008. Electrical engineering
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Byline AffiliationsUniversity of Sydney
University of Technology Sydney
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