Next Article in Journal
A Refined Self-Tuning Filter-Based Instantaneous Power Theory Algorithm for Indirect Current Controlled Three-Level Inverter-Based Shunt Active Power Filters under Non-sinusoidal Source Voltage Conditions
Next Article in Special Issue
A New Method to Monitor the Primary Neutral Integrity in Multi-Grounded Neutral Systems
Previous Article in Journal
Performance Analyses of Counter-Flow Closed Wet Cooling Towers Based on a Simplified Calculation Method
Previous Article in Special Issue
Development of Propulsion Inverter Control System for High-Speed Maglev based on Long Stator Linear Synchronous Motor
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle
Energies 2017, 10(3), 280; doi:10.3390/en10030280

An Efficient Phase-Locked Loop for Distorted Three-Phase Systems

1
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
2
School of Information Science and Engineering, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Received: 6 December 2016 / Accepted: 20 February 2017 / Published: 27 February 2017
(This article belongs to the Special Issue Power Electronics and Power Quality)
View Full-Text   |   Download PDF [6868 KB, uploaded 1 March 2017]   |  

Abstract

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. View Full-Text
Keywords: distorted grid conditions; SGDFT; Lagrange-interpolation method; frequency adaption; SC distorted grid conditions; SGDFT; Lagrange-interpolation method; frequency adaption; SC
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Cao, Y.; Yu, J.; Xu, Y.; Li, Y.; Yu, J. An Efficient Phase-Locked Loop for Distorted Three-Phase Systems. Energies 2017, 10, 280.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top