Ignoring mutual coupling in three-phase load-flow computations saves a lot of computational effort but provides inaccurate results for many applications. In this paper, the effect of mutual coupling is taken into account through equivalent branch voltage sources or bus current injections. This simple idea allows accurate enough solutions to be obtained, while much of the computational saving associated with decoupled load flows is retained. Experiments on several unbalanced networks are reported showing the performance of the proposed idea when applied to distribution load flows based on the forward/backward tree sweeps.
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