Real-time Implementation of Directional Overcurrent Protection Coordination in a Microgrid

This research paper is focused at the study and implementation of various protection relays and schemes in LabVIEW software for a small power system. The test power system is indigenously developed in the Lab. Hardware implementation is performed by using common modules available in laboratory, whereas interfacing is done by using LabVIEW. Various types of prototype relays are designed and tested for different faults. Performance of hardware relays and LabVIEW designed relays have been investigated. Individual LabVIEW designed relays are tested for real faults through Hardware in the Loop (HIL) simulation. A complete protection scheme of relays is designed for a simple 4-bus parallel-line meshed network. Real-time results for various faults at different buses show that the proposed scheme is accurate and fast.