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Recent advances in power system simulation have included the use of complexrectangular current and voltage (I-V) variables for solving the power flow andthree-phase power flow problems. This formulation has demonstrated superiorconvergence properties over conventional polar coordinate based formulationsfor three-phase power flow, but has failed to replicate the same advantages forpower flow in general due to convergence issues with systems containing PVbuses. In this paper, we demonstrate how circuit simulation techniques canprovide robust convergence for any complex I-V formulation that is derived fromour split equivalent circuit representation. Application to power grid testsystems with up to 10000 buses demonstrates consistent global convergence tothe correct physical solution from arbitrary initial conditions.

Improving Power Flow Robustness via Circuit Simulation Methods