Multi-resolution simulation of PWM Dc-Dc converters

Abstract

Multi-resolution simulation offers rapid simulation of power electronics converters from very general to very detailed consideration. An approach for multi-rate simulation of switched linear system is considered here. A detailed full-order model of the converter is built that appropriately includes the system parasitic, switching nonlinearity, and switching event detection. Numerically-rigorous order-reduction techniques are then used to extract a lower-order model for the desired simulation resolution. The simulation resolution can be adjusted on the user discretion, even during simulation run. The state continuity across different resolutions and switching events is ensured using appropriate similarity transforms. This methodology can also be used for accelerated steady-state solution of fast state variables. The proposed methodology is demonstrated on a boost converter in frequency- and time-domains.