An infinite bus with zero impedance, U_abs = 10 kV, theta = 30 deg, is connected to a PQ load with P = 10 MW and Q = 0 MW.

As the nominal power is set to 10 MW and the nominal voltage to 10 kV on both components, all p.u. absolute values are one. Since the load is purely resistive, all phasors are rotated by 30 deg.

For simplicity, the Start values are set assuming theta = 0; the nonlinear solver is able to converge on the correct solution from this initial guess.

This model demonstrates the correct behaviour of the InfiniteBus and LoadPQVoltageDependence in a simple case. It also demonstrates that the per-unit system implemented in the PortAC component is correct and consistent.

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