华南理工大学学报(自然科学版) ›› 2018, Vol. 46 ›› Issue (10): 1-8.doi: 10.3969/j.issn.1000-565X.2018.10.001

• 能源、动力与电气工程 •    下一篇

基于改进型SOGI的锁相环设计研究

欧阳森 马文杰   

  1. 华南理工大学 电力学院
  • 收稿日期:2018-03-26 修回日期:2018-04-18 出版日期:2018-10-25 发布日期:2018-09-01
  • 通信作者: 欧阳森( 1974-) ,男,博士,副研究员,主要从事电能质量、节能技术与智能电器研究. E-mail: ouyangs@scut.edu.cn
  • 作者简介:欧阳森( 1974-) ,男,博士,副研究员,主要从事电能质量、节能技术与智能电器研究.
  • 基金资助:
    广东省自然科学基金

The Design of Phase Locked Loop Based on the Improved SOGI

OUYANG Sen MA Wenjie   

  1. School of Electric Power,South China University of Technology
  • Received:2018-03-26 Revised:2018-04-18 Online:2018-10-25 Published:2018-09-01
  • Contact: 欧阳森( 1974-) ,男,博士,副研究员,主要从事电能质量、节能技术与智能电器研究. E-mail: ouyangs@scut.edu.cn
  • About author:欧阳森( 1974-) ,男,博士,副研究员,主要从事电能质量、节能技术与智能电器研究.
  • Supported by:
     Natural Science Foundation of Guangdong Province

摘要: 针对传统锁相方法的锁相精度在电网电压含有负序分量、谐波分量、直流分量等情况下有所降低的问题,本文提出一种基于二阶广义积分器(Second Order Generalized Integrator, SOGI)的改进型三相锁相环设计方案。首先,简要介绍了SOGI可进行信号正交处理的原理;其次,通过频域分析法,直观地指出传统SOGI抗直流偏移干扰能力弱的原因并量化分析了直流分量对基于传统SOGI的不平衡锁相环的影响;然后,为增强SOGI对电压检测信号中直流分量的抗干扰能力,对其进行结构上的改进,提出一种基于改进型SOGI的不平衡锁相环设计方案;最后,通过仿真与实验,验证本文理论研究的正确性。

关键词: 二阶广义积分器, 锁相环, 并网逆变器 

Abstract: This paper proposes a PLL based on double second-order generalized integral (DSOGI-PLL) of abstracting grid voltage phase quickly and accurately for low accuracy of traditional PLL in the case of the unbalanced grid voltage in grid-connected PV systems. Firstly, the principle of the SOGI, which can effectively extract the grid voltage positive sequence component, to be used as a quadrature signal generator is analyzed. Secondly, to eliminate the influence of DC offset, an improved structure of SOGI is proposed. So a novel PLL applicable to the case of unbalanced grid which can eliminate the influence of DC offset is shown. Finally, the effectiveness of the proposed PLL is varied by simulation and experiment.

Key words: second-order generalized integral, phase locked loop, grid-connected inverter

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