Voltage Sag Detection Algorithm Based on Dual DQ Decoupling Transformation

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 135)

Abstract

Conventional DQ transformation method and the PLL technology can detect the amplitude and phase of voltage sag accurately, but the method is only applicable to the case of symmetrical three-phase voltage. When three-phase voltage unbalance, there is a certain bias in the results by use of this detection method. A new detection method of improved PLL based on dual DQ decoupling transformation is proposed in this paper, it removed the coupling relationship of output voltages by setting the positive and negative sequence voltages reference, so this method can accurately detect the amplitude and phase information of the voltage sag. Simulation results validate that the proposed method is effective and feasible.

Keywords

Dynamic voltage restorer  Voltage sag  Voltage asymmetry  Dual DQ decoupling transformation  

References

  1. 1.
    Hao X, Du X, Chen W (2008) Survey on research dynamic voltage restorer. Sci Technol Eng 5:1259–1264Google Scholar
  2. 2.
    Park C, Gilsoo J (2007) Stochastic estimation of voltage sags in a large meshed network. IEEE Trans Power Deliv 3:1655–1664Google Scholar
  3. 3.
    Singh B, Al-Haddad K, Chandra A (1998) Three-Phase compensator for load balancing and reactive power Compensation in three-phase four wire electric power distribution systems. Electr Mach pow sys 26:27–37CrossRefGoogle Scholar
  4. 4.
    Ding H, Duan X, He Y (2000) A novel dynamic voltage restorer for unbalanced distribution systems. In: Proc CSEE 11:46–50Google Scholar
  5. 5.
    Akagi H, Kanazawa Y, Nabe A (1984) Instantaneous reactive power compensators comprising switching devices without energy storage compensators. IEEE Trans Ind Appl 3:625–630CrossRefGoogle Scholar
  6. 6.
    Yang J (2003) The research on long-distance power quality monitoring and active power filter. South China University of Technology, GuangzhouGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.College of Electrical and Information EngineeringLanzhou University of TechnologyLanzhouChina
  2. 2.Gansu Electric Power Research InstituteLanzhouChina

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