AC microgrid short-circuit current

Why are circuit breakers not used in AC microgrid?

For this reason, use of circuit breakers is not a suitable solution [, , ]. Variation in short circuit level: During grid-tied mode, short circuit fault can easily identify by protection devices in AC microgrid due to the higher value of short circuit fault current as compared to the rated value.

What are alternating current microgrids?

Alternating current (AC) microgrids are the next step in the evolution of the electricity distribution systems. They can operate in a grid-tied or island mode. Depending on the services they are designed to offer, their grid-tied or island modes could have several sub-operational states and or topological configurations.

Are over current protection devices suitable for AC microgrids?

Therefore, traditional over current protective devices are not suitable for protecting the AC microgrids. According to literature, in both grid-tied and island mode, there is consequential difference in fault current level and this fault current is perpetually changing due to the existence of distributed generation (DG) resources.

What is AC microgrid?

A critical review on AC microgrid protective solutions. A critical Discussion on open research issues and recommendation for future scope. Microgrid is an important component of the evolving smart-grid. It has the ability to increase reliability, decrease costs, and enlarge penetration rates for distribution generation systems.

What is a fault current scheme in a microgrid?

The scheme is designed for only islanded microgrid. The scheme is executed by the assessment of two novel parameters such as fault current coefficient (i.e. fault current delivered by any DER to any point inside the system) and modification of relay hierarchy for careful operation of relays.

What is the difference between AC and dc microgrid?

In AC microgrids, active power, reactive power, unbalance component and harmonics are the main components that required to be synchronized. In DC microgrids, DC power is the main component that needs to be controlled. Hence, DC microgrid control system is simple as compared to AC microgrid system . AC microgrid architecture is shown in Fig. 1.