AN EFFICIENT TECHNIQUE FOR THE TIME-DOMAIN SIMULATION OF POWER ELECTRONIC-CIRCUITS

A general-oriented time-domain simulation algorithm for power electron ic circuits is presented. The methodology is based on stepwise quadrat ic formulation of circuit state variable trajectory with progressive a nalysis of switches' operation. At each simulation step, the circuit t opology is transformed into a purely resistive network which is analyz ed by the modified nodal analysis (MNA) technique, The rate of change of each state variable is determined by its parasitic resistance and i nstantaneous value. The trajectory of each state variable and switch b ranch voltage is expressed by a quadratic description, A simple and ef ficient method is used to determine the switching instants of circuit topologies, The prominent features of this approach include: 1) its si mplicity in solving resistive network only throughout the analysis wit hout dealing with any complicated Laplace-transformed equation or diff erential formula; 2) its generality in determining valid circuit topol ogy without prior understanding of the switching relationships; 3) its directness in calculating the switching instants; and 4) its inherent consideration of the parasitic resistance of each reactive element in the analysis. Two examples illustrating the generality and computatio nal efficiency of the proposed algorithm are presented. The simulated results are favorably compared to the method used in available literat ure and the commercial software, PSpice.