Interfacing Convolution Based Linear Models to an Electromagnetic Transients Program

Abstract

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.