parallel computing has recently been made easier by using commercial emT tools and real-power system models, in which case ordinary pCs across an ordinary office network [a local area network (Lan)] or multiple Cpus on a single computer can share the computational burden. To do this, the network must first be separated into subnetworks, with each subnetwork communicating with the others across the Lan (see Figure 6). Overall simulation time is reduced to the speed of the slowest subsystem if it were running alone, to which a small amount of overhead time must be added. This allows for dramatic increases in runtime speed. using this approach, large emT or transient stability cases can be broken into many smaller cases, and the simulation time of the combined solution is correspondingly faster. Time steps and july/august 2017 CPU 1 CPU 1 CPU 2 EMT Model EMT Model EMT Model Complex System Complex System Complex System Complex System TCP/IP Communication Complex System Complex System Single CPU EMT Model Complex System Complex System EMT Model EMT Model CPU 3 CPU 4 Parallelized EMT Model figure 6. An EMT model running on a single CPU and the same model shared across multiple CPUs (on the same computer or different computers across a network). ieee power & energy magazine 101