Cascading overload failure analysis in renewable integrated power grids

Abstract

A higher penetration of renewable energy resources (RERs) in network introduces uncertainty in a grid, which causes cascading overload failures. To mitigate these issues completely, a network must be able to simultaneously solve different complex problems at the same time. For this purpose, proper assessment of a renewable integrated power grid (RIPG) is required simultaneously for load flow balancing and transients stability enhancement. The problem becomes severe with the occurrence of a three phase (L-L-L) fault (TPF) in a network, which causes various line outages in the form of (N-1) and (N-1-1-1) contingencies, and thus lead the network to cascading overload failures. This work aims to develop a hybrid probabilistic load flow balancing model along with transients stability model to completely mitigate cascading overload failures in multiple interconnected RIPGs due to (N-1) and (N-1-1-1) contingencies. For this purpose, a unified power flow controller (UPFC) integrated smart transmission network topology is proposed, which provides an optimal load flow balancing and transients stability enhancement concurrently. Contrary to the previous studies, this work is backed by detailed probabilistic analysis to mitigate completely cascading overload failures in multiple interconnected RIPGs due to (N-1) and (N-1-1-1) contingencies.