Power management of power electronics interfaced low-voltage microgrid in islanding operation

• Author / Creator

  Li, Yan

• Distributed generation systems based on renewable energy sources have been experiencing rapid development in recent years. As well, a more recent concept called microgrid is developed by grouping a cluster of loads and paralleled DG units in a common local area.
  
  This thesis focuses on the power control of power electronics interfaced low-voltage microgrid in islanding operation. A novel frequency-voltage frame transformation is proposed to improve the system stability and offset the power coupling in a low-voltage grid. A control algorithm to guarantee that the microgrid can be operated within the predetermined voltage and frequency variation limits is also proposed. Moreover, an adaptive reactive power droop method is proposed, which automatically updates the maximum reactive power limit of a DG unit based on its current rating and actual real power output, and features an enlarged power output range and improved system stability. Both simulation and experimental verification results are provided.

• Subjects / Keywords

  • Distributed generation of electric power
  • Interface circuits
  • Renewable energy sources
  • Low voltage systems
  • Electric controllers

• Graduation date

  Spring 2010

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3QP7X

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.