Various numerical integration techniques have been researched for efficient transient analysis of a power electronic circuit. According to the conventional methods, only a single numerical integration step, which is fixed or variable, is used for all variables. However, transient speeds or rates are not uniform temporally nor spatially, and they are stiff or multirate in most of power electronic circuits. It is reasonable to select more flexible step sizes temporally and spatially. According to a multirate method, multiple time steps which are selected to be optimized for subcircuits independently are used for efficient integration. This paper proposes a new multirate analysis method. It is based on explicit integration formulas which divide a circuit into sub circuits where optimal step sizes are selected. The principles are described and applied to power electronic converter snd inverter examples.
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