Study on the Fast Phase-locked Technology Applied in Three-phase Grid-connected System

Hongyan Zhao, Qionglin Zheng, Yan Li, Danyong Li

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

For improving the rapidity and stability of the phase detection in a three-phase grid-connected system, we proposed a novel fast phase-locked loop (FPLL) method. Firstly, by analyzing the inherent relationship between the grid voltage and the phase angle, and through calculation and table looking-up, the real-time phase angle can be obtained by the proposed FPLL. Moreover, the harmonic and disturbance contents in phase angle can be eliminated by a digital low-pass filter. Experiments and comparisons between FPLL and SRF-PLL were performed under five conditions of gird voltage, including the conditions of three-phase grid voltages sag synchronously, frequency changes, phase jumps, with harmonics and phase loses, etc. The experimental results show that, compared with SRF-PLL, FPLL has a faster phase tracking speed and a better phase-locking performance. Therefore, the proposed FPLL can be widely applied in the occasions where a fast dynamic response performance in three-phase grid-connected systems is required.

Original languageEnglish (US)
Pages (from-to)314-320
Number of pages7
JournalGaodianya Jishu/High Voltage Engineering
Volume44
Issue number1
DOIs
StatePublished - Jan 31 2018

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Phase locked loops
Electric potential
Electronic circuit tracking
Low pass filters
Digital filters
Dynamic response
Experiments

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Zhao, Hongyan ; Zheng, Qionglin ; Li, Yan ; Li, Danyong. / Study on the Fast Phase-locked Technology Applied in Three-phase Grid-connected System. In: Gaodianya Jishu/High Voltage Engineering. 2018 ; Vol. 44, No. 1. pp. 314-320.
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Study on the Fast Phase-locked Technology Applied in Three-phase Grid-connected System. / Zhao, Hongyan; Zheng, Qionglin; Li, Yan; Li, Danyong.

In: Gaodianya Jishu/High Voltage Engineering, Vol. 44, No. 1, 31.01.2018, p. 314-320.

Research output: Contribution to journalArticle

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