Abstract
Microgrids have been proposed in order to improve reliability and stability of electrical system and to ensure power quality of grid. Microgrid consists of low voltage distribution systems with distributed energy resources, such as wind turbine and photovoltaic power systems, together with storage devices. It is essential to protect a micro grid in both the grid-connected and the islanded mode of operation against all different types of faults. This paper describes micro grid protection and safety concept with central control and monitoring unit where multifunctional intelligent digital relay could be used. This central control & monitoring infrastructure is used for adaptive relay settings strategy for micro grid protection. Also operational safety design concept and fault mitigation technique is proposed to ensure confidence in protection system.
Highlights
With the development of renewable energy, energy storage and distributed generation (DG) the microgrid has attracted more and more concern due to its special features
This paper describes micro grid protection and safety concept with central control and monitoring unit where multifunctional intelligent digital relay could be used
When different type of distributed resource connected to micro grid and Utility grid, the distributed resources (DRs) contribute fault current to the system and the contribution level depends on distribution resource type
Summary
With the development of renewable energy, energy storage and distributed generation (DG) the microgrid has attracted more and more concern due to its special features. A micro grid consists of a low to medium voltage network of small load clusters with DG sources and storage. If a micro grid is connected to the system, it is seen as a single aggregate load or source. As distributed generator placed/situated close to the load, it has the advantage of reducing transmission losses as well as preventing network congestions [1,2]. Micro grids currently offer various advantages to endconsumers, utilities and society, such as: Improved energy efficiency, improve power quality and reliability, minimized overall energy consumption, reduced greenhouse gases and pollutant emissions, cost efficient electricity infrastructure replacement [1,2,3,4,5]
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