Control strategies of a dc microgrid for grid connected and islanded operations

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CONTROL STRATEGIES OF A DC MICROGRID FOR GRID CONNECTED AND
ISLANDED OPERATIONS
ABSTRACT
This paper proposes an algorithm for coordinated control of the distributed generators
integrated to a dc micro grid (DCMG), in islanded and grid connected modes of operation. The
proposed DCMG connects various types of nonconventional energy sources, storage system to
the dc, and three-phase, as well as single-phase ac loads. A control strategy for three-phase
voltage source inverter to integrate the three-phase load, as well as utility grid into the DCMG,
under various operating scenarios, has also been proposed. The proposed control strategy uses
a combination of the feed-back and feed-forward control loops. Dual proportional integral
controllers for ac voltage regulation and inner current control have been suggested in two
rotating direct- and quadrature- axis synchronous reference frames for controlling the respective
positive and negative sequence components. Simulations are carried out to verify the robustness
of the proposed algorithm and control strategy under different operating conditions including
fault scenario and its effectiveness in maintaining the dc voltage of the micro grid.

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