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

journal contribution
posted on 2023-05-21, 06:23 authored by Gautam, S, Lu, Y, Waqas HassanWaqas Hassan, Xiao, W, Lu, DD-C
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.

History

Publication title

Electric Power Systems Research

Volume

180

Article number

106156

Number

106156

Pagination

1-10

ISSN

0378-7796

Department/School

School of Engineering

Publisher

Elsevier Science Sa

Place of publication

Po Box 564, Lausanne, Switzerland, 1001

Rights statement

© 2019 Elsevier B.V. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Energy services and utilities

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