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Power Flow & Initial State Variables t = t0 Evaluate initial time step ∆t i=0 i=i+1 no yes i > imax Reduce ∆t ∆t < ∆tmin yes Evaluate END Singularity likely disturbance Evaluate system equations & Jacobians Compute Integration ∆x and ∆y method no no |∆xi |, |∆y i | < ǫ yes Output Update x & y Recompute ∆t no yes t + ∆t ≥ tf END Figure 8.1: Time domain integration block diagram. 77
