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Improvement of Inverter-based AC Microgrids Protection Against Short Circuit

Zarei, Fariborz | 2019

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52369 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein; Blaabjerg, Frede
  7. Abstract:
  8. Inverter-based distributed generations (IBDGs) have gained special interest in the electricity supply chain due to the advancements in power electronics technology. Power electronic inverters provide high-efficiency energy conversion with full controllability over a wide operating range, and ancillary services such as reactive power support and active filtering. Considering the voltage and frequency control capability of power inverters, supplying inverter-based micro-grid (IBMG) loads is now pissible. Despite the significant opportunities associated with such sources, they introduce new challenges that should be addressed properly. Reliable and accurate protection against short circuit faults is one of the main challenges in the proliferation of modern IBMGs. In this thesis, the protection issue has been divided into two categories of control actions and protective actions, and corresponding challenges have been addressed. In control actions, improving the IBDGs behavior under short circuit faults is the main goal. This allows IBDGs to ride through the faults. As a result, IBDGs remain active during a fault and return to normal operation upon fault clearance. To achieve this, the power inverters have been divided into two categories according to the operating modes which are “grid-forming” and “grid-following”, and corresponding fault-ride-through challenges have been investigated and addressed. Finally, to validate the proposed approaches, experimental and simulation results are provided. In the protective actions, the classic protection including fault detection strategies and protective relays have been investigated. The performance of the existing fault detection methods and protective relays has been analyzed, and corresponding challenges have been highlighted. Accordingly, proper fault detection feature based on short circuit modeling of the IBDGs has been proposed which is suitable for islanded IBMGs
  9. Keywords:
  10. Asymmetrical Short Circuit Fault ; Fault Detection ; Fault-Ride Through ; Inverter-based Microgird ; Islanded Microgrid ; Microgrid Protection ; Microgrid

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