GENERALIZED TLM SWITCH MODEL FOR POWER ELECTRONICS APPLICATIONS

A generalised model of a switch suitable for power electronic circuits simulation, based on the transmission-line modelling or matrix (TLM) method, is presented. It consists of an inductive stub model terminate d by a resistance having a small or large value depending on whether t he switch is on or off, respectively. In the previous TLM switch model , a series resistance is always required to be added to the model to r epresent the voltage drop during the conduction state, whereas in the new proposed switch model, depending on the state of the switch, the o n or off resistance forms an integrated part of the model. To demonstr ate the application of the generalised TLM switch model, a voltage-sou rce inverter (VSI) feeding an inductive load was considered. Results f rom the simulation are in complete agreement with expected theoretical waveforms.