A distributed simulation based approach for detailed and decentralized power system transient stability analysis

Abstract

This paper presents a distributed computing approach for piecewise transient stability (T/S) analysis of large-scale electrical networks using Diakoptics and large change sensitivity (LCS) concepts. Detailed T/S analysis in a secure and federative manner based on geographically decomposition using local computational resources is the greatest benefit realized by this method of analysis. In this way, with the minimum communications between subnetworks the same results as the conventional untorn T/S analysis can be achieved. Since the bottleneck in distributed computation is low speed network communication, a new latency exploitation technique is introduced for numerically solving system differential equations. The technique uses different step size in each subnetwork to decrease the number of numerical operations and data communications for a given total simulation time. The proposed distributed T/S method is implemented successfully across computer networks and its performance is studied using a 14 bus IEEE test system and some various large-scale networks up to 3000 buses. The presented results are compared with those obtained from conventional untorn T/S simulation.