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Decentralized Control of a Multi-DG Microgrid in Islanded Mode of Operation

Moradi Kali Kand, Ramin | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39910 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Karimi, Houshang; Karimi, Masoud
  7. Abstract:
  8. A control strategy for islanded (autonomous) operation of a microgrid consisting of two Distributed Generation (DG) units is proposed in this thesis. The DG units are connected together in a radial configuration. Each DG unit utilizes a voltage-sourced converter (VSC) to interface to its dedicated load. The DG units and the loads are to operate in the islanded mode of operation. To provide autonomous operation for the microgrid, voltage and frequency of the loads should be regulated. The proposed control strategy utilizes (i) an internal oscillator for frequency control in an open loop manner and (ii) a decentralized servomechanism controller to regulate the load voltage. The microgrid is assumed to be balanced and is modeled in the dq-frame. In this thesis, it is first shown that the radial connection of two DG units in the islanded mode constitutes an interconnected composite system consisting of two subsystems. Then, it is shown that the overall islanded system can be controlled by the local controllers, i.e., there is a solution to the decentralized servomechanism problem for the composite system. The robust control method is used to design a controller for each DG unit. Despite load parameters uncertainties, the proposed control strategy guarantees robust stability and pre-specified performance criteria, e.g., fast transient response and zero steady-state error. Performances of the proposed robust controllers are demonstrated based on digital time-domain simulation studies in MATLAB/SimPowerSystems software.

  9. Keywords:
  10. Dispersed Generation ; Decentralized Control ; Robust Control ; Microgrid ; Voltage Sourced Converter ; Interconnected Composite System

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