LAPSE:2019.1423
Published Article
LAPSE:2019.1423
An Efficient Phase-Locked Loop for Distorted Three-Phase Systems
Yijia Cao, Jiaqi Yu, Yong Xu, Yong Li, Jingrong Yu
December 10, 2019
This paper proposed an efficient phase-locked loop (PLL) that features zero steady-state error of phase and frequency under voltage sag, phase jump, harmonics, DC offsets and step-and ramp-changed frequency. The PLL includes the sliding Goertzel discrete Fourier transform (SGDFT) filter-based fundamental positive sequence component separator (FPSCS), the synchronousreference-frame PLL (SRF-PLL) and the secondary control path (SCP). In order to obtain an accurate fundamental positive sequence component, SGDFT filter is introduced as it features better filtering ability at the frequencies that are integer times of fundamental frequency. Meanwhile, the second order Lagrange-interpolation method is employed to approximate the actual sampling number including both integer and fractional parts as grid frequency may deviate from the rated value. Moreover, an improved SCP with single-step comparison filtering algorithm is employed as it updates reference angular frequency according to the FPSC, which promises a zero steady-state error of phase and improves the frequency tracking speed. In this paper, the mathematical model of the proposed PLL is constructed, its stability is analyzed. Also, design procedure of the control parameters is presented. The effectiveness of the proposed PLL is confirmed by experimental results and comparison with advanced pre-filtering PLLs.
Keywords
distorted grid conditions, frequency adaption, Lagrange-interpolation method, SC, SGDFT
Suggested Citation
Cao Y, Yu J, Xu Y, Li Y, Yu J. An Efficient Phase-Locked Loop for Distorted Three-Phase Systems. (2019). LAPSE:2019.1423
Author Affiliations
Cao Y: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yu J: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Xu Y: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Li Y: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China [ORCID]
Yu J: School of Information Science and Engineering, Central South University, Changsha 410083, China
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Journal Name
Energies
Volume
10
Issue
3
Article Number
E280
Year
2017
Publication Date
2017-02-27
Published Version
ISSN
1996-1073
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Original Submission
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PII: en10030280, Publication Type: Journal Article
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LAPSE:2019.1423
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doi:10.3390/en10030280
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Dec 10, 2019
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Dec 10, 2019
 
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Calvin Tsay
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