Performance analysis of a DC microgrid as a virtual synchronous machine in grid frequency and voltage control

Document Type : Research Article

Authors

Dept. of Electrical Engineering, Shahrood University of Technology, Shahrood, Iran

Abstract

Recently, due to environmental issues and lack of fossil resources, the widespread use of renewable resources has been considered. The use of renewable resources in the power systems leads to decentralized generation and due to the changing nature of such resources, many fluctuations have been added to the network. DC microgrids, as a small power grid, make it easy to use and control such resources in the distribution network. Excessive penetration of power electronic based renewable sources has reduced the inertia and damping making the system more sensitive to disturbances and reducing the system stability margin. This paper uses a DC microgrid structure connected to an AC network equipped with a virtual synchronous machine to manage automatically the power of the DC microgrid and AC networks and analyzing the role of virtual inertia in small signal stability. In order to verify the proposed method, the network has been studied for different operating conditions and inertias. In this method, with the use of the voltage source converter response and proper design dual droop control of the voltage, frequency and active output controllers, the necessary support for adjusting the system frequency are provided to withstand disturbances leading to enhancing stability for different conditions.

Keywords

References

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Computational Intelligence in Electrical Engineering
Volume 12, Issue 1
April 2021
Pages 15-36

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History

  • Receive Date: 17 May 2020
  • Revise Date: 14 September 2020
  • Accept Date: 19 September 2020

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