  Power system dynamic modeling involves nonlinear differential and algebraic
equations (DAEs). Solving DAEs for large power grid networks by direct implicit
numerical methods could be inefficient in terms of solution time; thus, such
methods are not preferred when real-time or faster than real-time performance
is sought. Hence, this paper revisits Waveform Relaxation (WR) algorithm, as a
distributed computational technique to solve power system dynamic simulations.
Case studies performed on the IEEE NE 10-generator 39-bus system demonstrate
that, for a certain simulation time window, the solve time for WR method is
larger than the length of the simulation window; thus, WR lacks the performance
needed for real-time simulators, even for a small power network. To achieve
real-time performance, then a Windowing technique is applied on top of the WR,
for which the solve time was obtained less than the length of a simulation
window, that shows the effectiveness of the proposed method for real-time
dynamic simulation of power systems.
