New Overcurrent Relay Coordination Method Through Time Intervals to Enhance Microgrid Protection

Yendry Gonzalez,Arturo Conde

doi:10.1109/access.2021.3134912

Abstract

New Overcurrent Relay Coordination Method Through Time Intervals to Enhance Microgrid Protection

Highlights

Owing to the increase in fossil energy costs, the development of electricity generation in recent decades has been oriented toward environmental conservation and greater efficiency [1]
The presented formulation guarantees the coordination of the directional overcurrent relays (DOCRs) through pre-established time intervals for the primary and backup functions
The functional independence between relays is obtained because each time curve is computed to comply with the time intervals

Summary

Introduction

Owing to the increase in fossil energy costs, the development of electricity generation in recent decades has been oriented toward environmental conservation and greater efficiency [1]. The vertical structure of electrical networks, mainly medium- and low-voltage networks, has been modified toward systems either isolated or with weak connections to the electrical network [2]. These microgrids (MGs) present a very wide diversity regarding their operation [3], and the connection of nondispatchable sources [4] significantly influences load flows and faults due to topology changes or to the intermittency of generation sources [5]. Integration of the MG into electrical networks has promoted the development of control and protection systems; for this purpose, local or distributed architectures have been considered [9]. The scheme must be capable of satisfying basic protection needs [10], such as selectivity, sensitivity, and reliability, either in a mode connected to the main network or in an island operation mode [11]

Objectives

Results

Conclusion