Document Type : Research article

Authors

1 GHD Advisory, Melbourne VIC 3000, Australia.

2 Dam and power plant department, Khuzestan Water and Power Authority (KWPA), Ahvaz 61348-13956, Iran.

3 Department of Electrical Engineering, Ramhormoz Branch, Islamic Azad University, Ramhormoz, Iran.

4 Department of Electrical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

Abstract

This paper presents the islanding and peninsulating of distributed generators (DGs), such as wind and solar ‎power plants, that feed microgrid systems. However, the paper does not focus on just an ordinary microgrid but ‎large microgrids that have several sub-microgrids with renewable energy resources and multiple connection ‎points (MCPs) to different grids. When islanding happens, the main microgrid disconnects some connection ‎points from grids whereas some connection points to other grids could be connected and divided into some sub-‎microgrids for better stability. Two new definitions are proposed for large microgrid islanding: percentage of ‎islanding and peninsulating. The former means how much it is possible that an islanding happens before it ‎happens, and the latter means that: “after separating from some connection points to grids in a large microgrid ‎with MCPs to different grids, remained large microgrid network is an island or a peninsula that is connected in ‎some connection points to other grids? So, peninsulating a large microgrid depends on the number of connection ‎points, at least two points, to different grids. This paper describes these two new definitions. The method involves ‎the measurement of utility currents, voltages, and other signals through a bidirectional communications system in ‎smart grids. These signals are used to calculate the percentage of islanding and decide on microgrid islanding or ‎peninsulating.

Graphical Abstract

Percentage of Islanding and Peninsulating Detection in ‎Large Microgrids with Renewable Energy Resources ‎with Multiple Connection Points to Different Grids

Highlights

 

  • Presenting a new method for islanding and peninsulating detection in large microgrids
  • Presenting of two concepts "percentage of islanding" and "peninsulating" in the study of islanding issues
  • Considering the impact of renewable energy resources in the presented islanding detection method
  • High usability of the proposed method due to the simplicity of its algorithm

Keywords