Electromagnetic Transient Analysis of Differential Protection Function in Grid-Connected IBR

This paper aims to analyse the impact of grid-connected Inverter Based Resources (IBR) on differential protection function for transmission line of bulk power system. For this purpose, the power grid and the photovoltaic plant (PV) are modeled and subjected to a series of line-to-line and single-line-to-ground fault scenarios in the electromagnetic transient program (EMTP). The transient responses of line current differential function elements i.e., phase element (87LP), negative sequence element (87LQ) and zero sequence element (87LN), of protective relays are recorded, analysed and discussed.