The Power Flow Equations

It is common in power system engineering to refer to node 3 as the “swing bus” or “slack bus.” The proper way to model the branch which includes P3, in order to account for eq. (5), is to make it a short circuit. One can easily see that this is the case by writing a KCL equation at the ground node of our circuit, as in Fig. 6. Fig. 6 ................
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