A Novel Fast Open-loop Phase Locking Scheme Based on Synchronous Reference Frame for Three-phase Non-ideal Power Grids

Liansong Xiong; Fang Zhuo; Feng Wang; Xiaokang Liu; Minghua Zhu; Hao Yi

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자료유형: 학술저널

저자정보: Liansong Xiong (Xi’an Jiaotong University) Fang Zhuo (Xi’an Jiaotong University) Feng Wang (Xi’an Jiaotong University) Xiaokang Liu (Xi’an Jiaotong University) Minghua Zhu (Xi’an Jiaotong University) Hao Yi (Xi’an Jiaotong University)

저널정보: 전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.16 No.4

발행연도: 2016.7

수록면: 1,513 - 1,525 (13page)

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Rapid and accurate phase synchronization is critical for the reliable control of grid-tied inverters. However, the commonly used software phase-locked loop methods do not always satisfy the need for high-speed and accurate phase synchronization under severe grid imbalance conditions. To address this problem, this study develops a novel open-loop phase locking scheme based on a synchronous reference frame. The proposed scheme is characterized by remarkable response speed, high accuracy, and easy implementation. It comprises three functional cascaded blocks: fast orthogonal signal generation block, fast fundamental-frequency positive sequence component construction block, and fast phase calculation block. The developed virtual orthogonal signal generation method in the first block, which is characterized by noise immunity and high accuracy, can effectively avoid approximation errors and noise amplification in a wide range of sampling frequencies. In the second block, which is the foundation for achieving fast phase synchronization within 3 ms, the fundamental-frequency positive sequence components of unsymmetrical grid voltages can be achieved with the developed orthogonal signal construction strategy and the symmetrical component method. The real-time grid phase can be consequently obtained in the third block, which is free from self-tuning closed-loop control and thus improves the dynamic performance of the proposed scheme. The proposed scheme is adaptive to severe unsymmetrical grid voltages with sudden changes in magnitude, phase, and/or frequency. Moreover, this scheme is able to eliminate phase errors induced by harmonics and random noise. The validity and utility of the proposed scheme are verified by the experimental results.

#Fundamental-frequency positive sequence component construction #Harmonic elimination #Method of symmetricalcomponents #Noise immunity #Open-loop phase locking #Virtual orthogonal signal construction

Abstract
I. INTRODUCTION
II. PROPOSED OPL-SRF SCHEME IN A SYMMETRICAL GRID
III. FAST FFPS COMPONENT CONSTRUCTION AND OPL-SRF SCHEME FOR UNSYMMETRICAL GRID
IV. FAST AND ACCURATE ORTHOGONAL SIGNAL CONSTRUCTION METHOD
V. OVERALL DIAGRAM OF DEVELOPED OPL-SRF SCHEME
VI. EXPERIMENTAL VERIFICATION
V. CONCLUSION
REFERENCES

참고문헌 (34)

참고문헌 신청

[학술지(정기간행물)] - J. M. Carrasco / 2006 / Power-electronic systems for the grid integration of renewable energy sources : a survey / IEEE Trans. Ind. Electron 53 (4) : 1002 ~ 1016

[학술지(정기간행물)] - Long-Yue Yang / 2015 / A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions / Journal of Power Electronics 15 (1) : 216 ~ 226

[학술지(정기간행물)] - 박진상 / 2014 / Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters / Journal of Power Electronics 14 (3) : 598 ~ 607

[학술지(정기간행물)] - F. Blaabjerg / 2006 / Overview of control and grid aynchronization for distributed power generation systems / IEEE Trans. Ind. Electron 53 (5) : 1398 ~ 1409

[학술지(정기간행물)] - Cláudio H. G. Santos / 2013 / Fourier-Based PLL Applied for Selective Harmonic Estimation in Electric Power Systems / Journal of Power Electronics 13 (5) : 884 ~ 895

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