PARALLEL VECTOR PROCESSING SYNERGY AND FREQUENCY-DOMAIN TRANSIENT STABILITY SIMULATIONS

The use of vector and parallel-vector processing to perform triangular substitution and power system transient stability simulations is expl ored in this paper. Experimental results obtained from the Cray X/MP-1 16se and Cray Y/MP-8/8-64 show large gains due to vectorization. Exper imental results on the Alliant FX/8 show that the synergistic relation ship between parallel and vector processing can be used to achieve gai ns on the order of 25 for multiple forward and backward substitution p roblems. The vectorized triangular solver is incorporated into a frequ ency domain relaxation scheme for performing dynamic simulations. Inte rfacing the and frequency domain variables is achieved using a vectori zed fast Fourier transform routine. A sparse implementation of the fre quency domain integrator and lag operators is shown to be highly vecto rizable and to require O(N) operations rather than O(N2) required by a dense formulation. Dynamic simulation results are provided for the Cr ay X/MP and Cray Y/MP showing real-time performance.