Thesis

Parallell connected inverter operation in an islanded microgrid

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13517
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Department, School or Faculty
Abstract
  • This thesis focuses on improving power sharing and ac distribution system power losses for parallel connected inverters in an islanded microgrid. The effect of line impedance on power flow in ac system is presented. A new circulating current definition for multiple parallel connected inverters connected to the same load bus is proposed. An improved instantaneous average current sharing (IACS) scheme with two additional gain schedulers is proposed to improve conventional IACS controller performance under line impedance mismatch. A generalized model of single-phase parallel connected inverters with the improved IACS scheme is derived. This model is used for voltage and current controller design. A new power sharing scheme utilizing a central controller for parallel connected inverters in an islanded microgrid is presented. This scheme is optimized after incorporating a power ratio calculation. Case studies of a rural islanded microgrid involving three DGs with eight distributed loads demonstrate the power sharing scheme's capability to reduce distribution power losses and improve voltage regulation.
Resource Type
DOI
Date Created
  • 2013
Former identifier
  • 996405

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