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Decentralized Active Power Management in PV/Battery Hybrid Source Islanded Microgrids

Karimi, Yaser | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49687 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Oraee, Hashem
  7. Abstract:
  8. Due to environmental concerns and continuous decrease in the price, photovoltaic (PV) generations have been increasing in the recent years. PV units can operate in grid-connected or islanded modes. In grid-connected mode, the PV unit delivers its generated power to the grid; on the other hand, in islanded mode, it supplies the local loads. In this research, a new decentralized power management and load sharing method for a photovoltaic based islanded microgrid consisting of various PV units, battery units and hybrid PV/battery units is proposed. Unlike the previous methods in the literature, there is no need to communication among the units and the proposed method is not limited to the systems with separate PV and battery units or systems with only one hybrid unit. The proposed method takes into account the available PV power and battery conditions of the units to share the load among them. To cover all possible conditions of the microgrid, the operation of each unit is divided into six states and modified active power-frequency droop functions are used according to operating states. The frequency level and other local conditions of the unit are used as trigger for switching between the states. Efficacy of the proposed method in different load, PV generation and battery conditions is validated by simulation and experimentally in a microgrid consisted of three units. First a single phase microgrid is considered, then the proposed method is extended to a hybrid single/three-phase microgrid in which the power can be delivered from one phase to another autonomously
  9. Keywords:
  10. Microgrid ; Hybrid Photovoltaic System ; Power Management ; State of Charge ; Decentralized Power Management ; Hybrid Photovoltaic/Battery Source ; Hybrid Single/Three Phase Microgrid

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