Dc impedance model-based resonance analysis of a vsc–hvdc system

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Engineering

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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This paper presents a unified control strategy that enables both islanded and grid-tied operation of three-phase inverter in distributed generation (DG), with no need for switching between two corresponding controllers or critical islanding detection. The proposed control strategy composes of an inner inductor current loop, and a novel voltage loop in the synchronous reference frame (SRF). The inverter is regulated as a current source just by the inner inductor current loop in grid-tied operation, and the voltage controller is automatically activated to regulate the load voltage upon the occurrence of islanding. Furthermore, the waveforms of the grid current in grid-tied mode and the load voltage in islanding mode are distorted under nonlinear local load with the conventional strategy. And this issue is addressed by proposing a unified load current feed forward in the paper. Additionally, the paper presents the detailed analysis and the parameter design of the control strategy. Finally, the effectiveness of the proposed control strategy is validated by the simulation and experimental results.

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Dc impedance model-based resonance analysis of a vsc–hvdc system

1. 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.

Dc impedance model-based resonance analysis of a vsc–hvdc system

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