Interfacing Convolution Based Linear Models to an Electromagnetic Transients Program

This paper describes a convolution based terminal
equivalent for the PSCAD/EMTDC simulation environment,
implemented as a user-defined component. This frequency
dependent terminal equivalent (FDTE) reproduces the terminal
behavior of a multi-port linear system given as a phase domain
state-space model. The model can be identified using available
software. A user-written PSCAD component reads the state
space parameters from file and includes the model in the
simulation via a companion model and trapezoidal based
convolution. In addition is implemented a frequency dependent
transfer function model (FDTF) that calculates the transfer
between a set of inputs and outputs. The accuracy of the
FDTE/FDTF components is validated by numerical examples.
Also is shown an example from network equivalencing where
large savings in computation time is achieved, compared to a
traditional modeling procedure.