TITLE:
Designing a Protection Scheme in Micro-Grid Systems with DG Using Central Protection Unite and Multiple Setting Group Protection Relays
AUTHORS:
Mostafa I. Saleh, Gaber El-Saady, Ali M. Yousef, El-Noby A. Ibrahim
KEYWORDS:
Directional Overcurrent Relay, Protection Coordination, Distributed Generators, Central Protection Unite, Multiple Setting Group Protection Relay
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.12 No.9,
September
14,
2024
ABSTRACT: Distributed generators now is widely used in electrical power networks, in some cases it works seasonally, and some types works at special weather conditions like photo voltaic systems and wind energy, and due to this continuous changes in generation condition, the fault current level in network will be affected, this changes in fault current level will affect in the coordination between protection relays and to keep the coordination at right way, an adaptive protection system is required that can adaptive its setting according to generation changes, the fault current level in each case is evaluated using ETAP software, and the required relay setting in each case is also evaluated using Grey Wolf Optimizer (GWO) algorithm, and to select suitable setting which required in each condition, to select the active setting group of protection relay according to generation capacity, central protection unite can be used, and to improve protection stability and minimizing relays tripping time, a proposed method for selecting suitable backup relay is used, which leads to decrease relays tripping time and increase system stability, output settings for relays in all cases achieved our constrains.