Sharif Digital Repository

Rational functions for approximation of the admittance matrix elements of a linear power system/component are used to increase the computational efficiency for the analysis of electromagnetic transients. The challenge in this regard is passivity enforcement of the resultant model to guarantee numerical stability of the analyses. The main cause of passivity violation of the equivalent model of a passive system/ component, in a specific frequency region, is the selection of unsuitable and/or insufficient number of frequency samples for fitting. The more severe the passivity violations are, the more effort is required to enforce passivity. This paper presents an adaptive sampling technique for... 

This paper presents a high performance real-time simulator for power electronic systems applications and primarily intended for controller hardware-in-the-loop (CHIL) testing. The novelty of the proposed simulator resides in the massively parallel hardware architecture that efficiently exploits fine-grained parallelism without imposing severe communication overhead time that can limit the performance. The simulator enables the use of a nanosecond range simulation timestep to simulate power electronic systems. Through the use of this nanosecond range simulation timestep, the simulator minimizes the error arising from the intersimulation timestep switching phenomenon associated with CHIL. The...