A method for the assessment of the optimal parameter of discrete-time switch model

Abstract

a b s t r a c tThis paper proposes a novel method for the optimal parameter selection of the discrete-time switch model used in circuit solvers that adopt the fixed admittance matrix nodal method (FAMNM) approach. As known, FAMNM-based circuit solvers allow to reach efficient computation times, in particular for realtime simulation applications, since they do not need the inversion of the circuit nodal admittance matrix. However, these solvers need to optimally tune the so-called discrete switch conductance, since this parameter might largely affect the simulations accuracy. Within this context, we propose a method for the determination of the discrete-time switch conductance which is obtained by minimizing the distance between the eigenvalues of the original circuit's nodal admittance matrix with those associated with the circuit including the discrete-time switches. The method is proven to provide values of the discrete-time switch conductance that maximize the simulation accuracy and minimize the losses on this artificially introduced parameter. Additionally, the proposed method avoids the use of trial-and-error process typically required when discrete-time switch conductances need to be addressed in FAMNM approach. The performances of the proposed method are demonstrated for circuits with single and multiple switches in which passive RLC elements and transmission lines are both considered.

A general purpose FPGA-based real-time simulator for power systems applications

“…The current source associated with the switch at the simulation step n+1 is defined as [12] Although this method is computationally highly efficient, it introduces artificial parameters (i.e., Gs) into the circuit that do not exist in reality. An example of how the influence of these parameters can be minimized has been discussed in [24].…”

FPGA‐based hardware‐in‐the‐loop real‐time simulation implementation for high‐speed train electrical traction system

“…The common method for selecting the optimal switch admittance parameter is to consider a priori switch admittance parameters and then compare them with the benchmark test results to find the corresponding optimal value. However, the efficiency of this trial and error method is very low [20, 21].…”

A direct mapped method for accurate modeling and real-time simulation of high switching frequency resonant converters

“…However, ADC is prone to fictitious oscillations that can alter the behavior of a PEC model in particular when dealing with HSF. Various techniques exist to alleviate these drawbacks [12]- [15], but are unpractical for resonant converters because the adopted switch model affects the resonant tank behaviour. The RSM on the other hand uses a two-valued resistance for the switch (R on ≃ 0 and R off ≫ 0) [16]- [20].…”