自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 10    October 2015

[PDF Download]    [Flash Online]

    

Design and testing of a centralized protection scheme for micro-grids
Sohrab Mirsaeidi1, Dalila Mat Said1, Mohammad Wazir Mustafa1, Mohammad Hafiz Habibuddin1, Kimia Ghaffari2

1. Centre of Electrical Energy Systems (CEES), Faculty of Electrical Engineering (FKE),
Universiti Teknologi Malaysia (UTM), 81310 Skudai, Johor, Malaysia;
2. Young Researchers and Elites Club, Saveh Branch, Islamic Azad University, Saveh, Iran

Abstract:Micro-grids comprise low voltage distribution systems with distributed energy resources (DERs) and controllable loads which can operate connected to the medium voltage grid or islanded in a controlled coordinated way. This concept aims to move from “connect and forget” philosophy towards a full integration of DERs. Micro-grids can provide numerous economic and environmental benefits for end-customers, utilities and society. However, their implementation poses great technical challenges, such as a new philosophy in design of protection systems. In this work, a micro-grid protection scheme is presented based on positive-sequence component using phasor measurement units (PMUs) and a central protection unit (CPU). The salient feature of the proposed scheme in comparison with the previous works is that it has the ability to protect both radial and looped micro-grids against different types of faults with the capability of single-phase tripping. Furthermore, since the CPU is capable of updating its 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), it can protect micro-grid against subsequent faults. Finally, in order to verify the effectiveness of the suggested scheme and the CPU, several simulations have been undertaken by using DIgSILENT PowerFactory and MATLAB software packages.

 

Key words: micro-grid protection; grid-connected mode; islanded mode; positive-sequence component

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号