不平衡工况下电网电压序分量快速提取方法

Translated title of the contribution: Fast Extraction Method of Grid Voltage Sequence Components in Unbalanced Conditions

Liansong Xiong, Liancheng Xiu, Zhiliang Kang, Hanliang Song, Di Liu, Zhao Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The basic requirement for implementing high-performance grid-connected inverter control is to quickly and accurately obtain the sequence components (i.e., positive, negative and zero sequence components) of the three-phase unbalanced grid voltage. This paper proposes a practical extraction method of sequence components, and it can significantly improve the extraction speed of voltage sequence components in unbalanced grid. The method first uses the virtual quadrature signal construction method and the single-phase locked operation to obtain the virtual three-phase voltage phasor. Next, the symmetrical component method and the single-phase-locked inverse operation can be used to quickly obtain the amplitude and real-time phase of the sequence component. The method only needs the grid voltage and its virtual orthogonal signal to calculate the amplitude and phase of the voltage sequence component, and the method does not require parameter design and debugging process. Meanwhile, its calculation accuracy can meet engineering requirements. The correctness of the method is verified by MATLAB/Simulink real-time simulation platform.

Translated title of the contributionFast Extraction Method of Grid Voltage Sequence Components in Unbalanced Conditions
Original languageChinese
Pages (from-to)144-151
Number of pages8
JournalDianli Xitong Zidonghua/Automation of Electric Power Systems
Volume43
Issue number11
DOIs
Publication statusPublished - 10 Jun 2019

Keywords

  • Coordinate transformation
  • Sequence component
  • Symmetrical component method
  • Unbalanced power system
  • Virtual orthogonal signal

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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