A new approach to discrete-time modelling of switches in power electronic networks in emt simulation is presented. The method is based on obtaining modified solutions using compensation techniques based on inverse matrix modification. It results in a discrete-time switch model consisting of a constant conductance in parallel with a controlled current source. This approach will avoid matrix refactorization due to changes in switch states and will help speed up power electronic simulation. Essentially a resistive switching approach, compensation-based switching model is an elegant approach devoid of any known approximation or convergence issues. The proposed method has been validated against the well-known PSCAD and RTDS simulators. Detailed examples of this approach with validation results are presented.
Om Nayak, Nayak Corporation