A protection strategy for micro-grids based on positive-sequence component

Sohrab Mirsaeidi; Dalila Mat Said; Mohammad Wazir Mustafa; Mohammad Hafiz Habibuddin

A protection strategy for micro-grids based on positive-sequence component

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Author(s): Sohrab Mirsaeidi ¹ ; Dalila Mat Said ¹ ; Mohammad Wazir Mustafa ¹ ; Mohammad Hafiz Habibuddin ¹
- Affiliations: 1: Centre of Electrical Energy Systems (CEES), Faculty of Electrical Engineering (FKE), Universiti Teknologi Malaysia (UTM), 81310 Skudai, Johor, Malaysia
Source: Volume 9, Issue 6, August 2015, p. 600 – 609
DOI: 10.1049/iet-rpg.2014.0255 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 29/07/2014, Accepted 06/01/2015, Revised 10/12/2014, Published 02/03/2015

In recent years, the concept of micro-grid has appeared as an appropriate way for the integration of distributed energy resources (DERs) in the distribution networks. However, micro-grids have encountered a number of challenges from control and protection aspects. One of the main issues relevant to the protection of micro-grids is to develop a suitable protection technique which is effective in both grid-connected and stand-alone operation modes. This study presents a micro-grid protection scheme based on positive-sequence component using phasor measurement units and designed microprocessor-based relays (MBRs) along with a digital communication system. The proposed scheme has the ability to protect radial and looped micro-grids against different types of faults with the capability of single-phase tripping. Furthermore, since the MBRs are capable of updating their pickup values (upstream and downstream equivalent positive-sequence impedances of each line) after the first change in the micro-grid configuration (such as transferring from grid-connected to islanded mode and or disconnection of a line, bus or DER either in grid-connected mode or in islanded mode), they can protect micro-grid lines and buses against subsequent faults. Finally, in order to verify the effectiveness of the suggested scheme and the designed MBR, several simulations have been undertaken using DIgSILENT PowerFactory and MATLAB software packages.

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A protection strategy for micro-grids based on positive-sequence component

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