A Matlab-Based Simulation Tool For The Analysis Of Unsymmetrical Power System Transients In Large Networks

Abstract

This paper presents an extendable Matlab-based phasortime domain toolbox for modeling, simulation and analysis of unsymmetrical power system transients in large networks. Unlike most of the existing transient stability simulators which represent the transmission network on a per phase positive sequence basis, the new simulation function introduced in this paper is based on the symmetrical component technique which employs the three sequence networks. This representation allows consideration of network imbalances in order to include a wide range of disturbances during transient stability studies. The main aim of this paper is to describe the model details of the power system components required for unsymmetrical transients analysis and the solution methodology in the introduced simulation function. The performance of the simulation function is tested using standard IEEE test network models and the promising results are positively compared to respective results in DIgSILENT PowerFactory in terms of accuracy.

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“…m files for the PMSG generator and the generator‐side converter. Details about the additional component models, solution methodology, and simulation workflow in the extended transient stability analysis toolbox are given in [28, 29].…”

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“…However, the variables in this case are positive sequence variables, since the analysis is based on a symmetrical transients' analysis algorithm. The algorithm will be extended to include analysis of unsymmetrical transients as part of future implementations according to the analysis approach presented in [41].…”