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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.

Item Type:	Article
Authors/Creators:	Gautam, S and Lu, Y and Hassan, W and Xiao, W and Lu, DD-C
Keywords:	phase locked loop, moving average filter, grid connected power system
Journal or Publication Title:	Electric Power Systems Research
Publisher:	Elsevier Science Sa
ISSN:	0378-7796
DOI / ID Number:	https://doi.org/10.1016/j.epsr.2019.106156
Copyright Information:	© 2019 Elsevier B.V. All rights reserved.
Related URLs:	Google Scholar: Hassan, W
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