This paper presents a study on protection coordination of overcurrent relays (OCRs) in a distributed system by considering its different operating modes. Two different case studies which are considered in present work for protection coordination include: (i) DG interfaced distribution system in grid connected mode and (ii) DG interfaced distribution system in islanded mode of operation. The pro...

A dynamic equivalent black-box model, based on Prony analysis is presented in this paper. The proposed model is suitable for dynamic studies of microgrids, considering changes in the active and reactive power, bus voltages, currents and frequency. The developed model is evaluated using simulation results obtained from a medium voltage microgrid and test measurements recorded in a low voltage mi...

Protecting inverter-interfaced microgrids is challenging as conventional time-overcurrent protection becomes unusable due to the lack of fault current. There a great need for novel protective relaying methods that enable application coordination on microgrids, thereby allowing with larger areas and numbers loads while not compromising reliable power delivery. Tools modeling analyzing such under...

Inverters in microgrids (MGs) face significant challenges during their parallel operations, such as accurate power sharing, deviations system voltage magnitude and frequency, imbalance between generation load demand. To solve these technoeconomic challenges, hierarchical control structures are implemented MGs. The structure consists of three layers primary, secondary, tertiary controls. approac...