INTRODUCTION
The protection scheme (PS) should be achieved a safe and reliable operation, so that problems are identified. The proposed scheme provides protection to detect any deviations in micro-grid and isolating the smallest possible part, for the rest of the system to continue operating. This protection system also enable micro grid to operate in modes that are associated with the utility grid or islanded provide sufficient security for customers and equipment.
The microgrid is connected to the utility grid via a step-up transformer as shown microgrid Figure 1. It has a mesh partially containing Bus_1 and Bus_2. There are two loads connected to the system. This technique employs protection combine symmetrical and differential current components.
In microgrid each feeder protected by using two relays that is located at the end of the feeder. In normal …show more content…
[2] have presented a generator digital protection scheme in which the negative sequence power is monitored at the terminals of the machine and the direction of its flow is used to determine whether the fault is internal or external to the generator. They calculate the fundamental frequency components using the crow’s correlation method based on the Fourier technique. Recently, Degens [3] presented a digital filtering technique for calculating the symmetrical components. This method is computationally efficient, but filters employed introduce a delay of about 30 ms, for positive- and negative-sequence component calculation.
The differential protection in fault detection can be used due to fast run-time of addition of differential protection relay, protection plan using a symmetrical component are incorporated. If protection can only provide symmetrical components relay islanded mode will not provide enough current to detect problems as a result of lower faults from the current level, but the system voltage drops significantly due to the output current reduced to the converter energy during the