Energy Management Strategy for Supercapacitor in Droop-controlled DC Microgrid Using Virtual Impedance

• Author / Creator

  Zhang, Yuru

• With a proper energy management strategy (EMS), supercapacitor (SC) can be integrated into droop-controlled DC microgrid as an independent supercapacitor energy storage system (SCESS). The resulting microgrid could supply repeatedly quick bursts of electrical power due to load or source transients and improve power quality and lifetime of other distributed generations (DGs) or distributed energy storages.
  In this thesis, a novel control strategy for SCESS is proposed. The method uses the virtual impedance loop to add a virtual resistor and a virtual capacitor connected in series between the converter and DC bus, which decouples power flow between SCESS and other DGs while ensuring the plug’n’play feature. The results show that the proposed EMS has a competing dynamic performance with excellent flexibility as compared to existing methods.

• Subjects / Keywords

  • Virtual impedance
  • Droop-controlled DC microgrid
  • Distributed Generation
  • Supercapacitor

• Graduation date

  Fall 2015

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3K64B19N

• 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.